Same here. Had to quickly borrow a drill from a neighbor like 25 years ago because mine failed for like the last hole. I couldn't continu and I asked him if I could use his for 1 hole. The machine that he gave me was like 20 years old back then. I think I screwed up somehow since it stopped and started the old mechanical smell thing. I put on other clothes drove to a store that was open, on a Sunday it was not easy back then, bought a higher powered and certainly way more expensive machine and gave it to him together with a good bottle of wine. Even then I was really embarassed since I am so careful with my own stuff. And own stuff means attached stories to it in my case. I once lend out a camcorder like 20 years ago and out of the blue received it back last year in a plastic bag. I didn't even try if it still worked. And yes, the stuff that I lend out, even electronic stuff, never comes back. Couple of months ago I asked my Linux sattelite receiver back, that was brand new, that I installed and configured so that the person could watch free to air stuff. I spend hours and hours configuring, adjusting and explaining. I installed that like 6 years ago. When I wanted it back he said he didn't know what it was and that I could go ... myself.. And there is plenty more missing that I worked pretty hard for.
I remember when I was a child my father gave me a word of wisdom. He said never loan anything unless you can afford to lose it. I did anyway and learned my lesson.Sorry that happened to you-I know the experience .Some borrowers don't give 2 craps.
I made the rule after 40 years ago i loaned my pressure washer to a friend and they loaned it it to another friend when it came back it was broken. Friend 1 blamed friend 2. Friend 2 said he couldn't use it as it was broken. Was on friend 1 for years trying to get it replaced and he refused. Friend 2 was so pissed at friend 1 for passing the buck he never talked to him again. Friend one died a few years ago. Guess I'm not getting a new pressure washer from him.
This is also exactly what happens when you're smart enough to use without breaking finnicky quirky chinese low quality tools. People around you watch you using them and think they can do the same as you. (Refreshing change to see the word "lose" spelt correctly. It's dogs nuts and bolts are "loose"
It's a pity that a tool in which you can put the battery backwards doesn't have a clear label giving polarity and some protection. It could be just a reverse diode and a fuse...
If it can be shoved in backwards forcibly, padded with the wrong size, Hooked up to an external power source, or in ANY WAY mucked about with.. It will be. The "pity" is that this has become acceptable behaviour. And the manual flinging "I'm not a kid" majority have brought this on themselves. A diode would possibly have saved it. But that is an extra cost. And the other dozen companies making the same thing will leave it out, saving 10 cents per unit. A fuse would require access to replace, and that adds to the unit cost, and the competition will omit it, and undercut you. and if it fails due to dumbassery.. New unit sold.. Cha-ching! Profit is the wholesale price minus the cost to manufacture and deliver. Save a few pennies on the right side of the line, that becomes profit. Can't really fault companies for this. Smart people will check polarity. Dumb people will increase sales.
That fried IC being a charging control means the power flow to that battery had to be bi-directional so a simple series diode to block reverse voltage would also prevent charging current going back out. I assume whatever charger this thing used must have plugged into the unit someplace rather than the user supposed to pull out the battery?.
@@JohnBailey39 The terrible thing the manufacturer did is have the polarity the _opposite_ of what's expected. 99% of the time the spring goes to the negative and the few exceptions I've seen are clearly marked. Better handling of the polarity might add a few cents to the device cost but it would cut down on support costs. Blaming the customer for doing the obvious thing is an easy way for them to advocate against buying your product.
The 8205A Dual Mosfet package (also blown, near the power connector) is the reverse polarity protection. All he needs to do is replace that and power will be restored. That chip is used in almost all small lithium protection PCBs, so they are as common as dirt.
For me it’s not loosing the tool that’s the issue. It’s the disappointment when someone lies in your face that you might have considered an friend. I have no idea how anyone can do that tho. If it was me I would have been so sad I destroyed it and done anything in my power to fix the issue/replace it and then some. I guess different people have different values sadly.
I have a relative who was a notorious borrower. He broke EVERYTHING he was ever lent. Riding mower, came back with a stripped gearbox. Weed-whacker, came back with a bent shaft like a cork screw. Axe he borrowed & never gave back. Found years later hidden. it's head tucked away with the handle missing. Broke clean off. Even wrenches & hammers... if it left your sight and he laid hands on it, it was doomed. 🤨
I think what would have pissed me off even more than my equipment not working is the fact that he tried to "play stupid" and lie his way out of any wrongdoing. If I were in your position, the guy being straight up about what happened would have been much easier to take than him lying his butt off. I'm not one to ask to borrow things, but if I borrowed something and something happened to it while it was in my care, I'd feel obligated to pay to have it repaired or replaced. My Dad was a woodworker and there were two people who he'd loan something to, because he knew that if something happened to the item, they'd make it right.
I learned that the people who get angry when you don't want to lend them something are just the people you shouldn't lend things to, because they are showing that they have no respect for you.
I can't believe his response was something along the lines of "you didn't pay anything for it." He should have at least offered to pay for your bench time troubleshooting it!
I hear you and I agree. As a small boy my dad strongly taught me not to lend tools out. And I’ve pretty much stuck to that rule for 50+ years, and after a few costly lessons too. Shame that manufacturer left the reverse polarity protection out of their design. “…well you shouldn’t have loaned it to me”, yes and next time I won’t.
it amazes me how people just dont give a shit about other peoples property. I mean, it just further strengthens my case on how human beings are scum, we are worse than animals.
I lent my Snap-On torque wrench to a 'friend' and I expressly told him "set the torque, do the work, then turn it back to zero when you're done" He agreed, then I got it back a couple weeks later and I opened the case and it was still set to 100 lbft and I lost it on him. Needless to say he's no longer a friend. He told me I was over-reacting, but I told him he had utter contempt for the value of other people's tools as it's worth nothing to him. I also loaned an engine stand to another 'friend' and never got it back cuz he thought that because he was getting a divorce, meant I'd understand that I somehow forfeited it cuz he desparately needs the $$ now. Divorce charity I guess, WTF?
i have loaned out tools that were never returned and vinyl records that i never saw again. i learned that lesson long, long ago. i have given away working electronics to people and they just trashed them. no more. if someone wants to "borrow" some money, it means you will never get it back. been there, done that too.
Learned the money thing with my daughter. Got a big ticket for speeding and didn't pay so could not renew license till ticket paid. Wife loaned her the money. Have never seen it again. When she got caught speeding a second time and had car impounded she called for a hand out and I said sure after you pay back the previous ticket. She got the money from her boy friend.
Back in the 80's I was in a local rock band. Our guitar player was a bit of an idiot and anyway.. this one night at the town hall.. biggest gig they had ever had during the soundcheck he pulled this "trick" he had apparently seen done by some other crap glam rock band guitar player.. result.. headstock of his not exactly cheap Charvel guitar going nose first into the stage.. shattering.. and being scattered in bits across the room.. He then proceeded to ask me if he could "borrow" my USA 1967 Strat ( a blue paisley one.. really rare.. my pride and joy which was why I never gigged it) and got upset when I told him flat NO !! One of the other bands guitarists took pity on him and loaned him his really expensive proper Jackson.. Idiot tries the same stunt immediately.. the results?.. well who could have guessed?.. We didn't play that night due to having no guitar player who was up the hospital with two broken arms... I loaned the guitar player in the other band a rather ratty looking but pretty decent Peter Cook (UK reknowned luthier back in the day. they make stupid money now but mine was rough looking having been gigged a lot) Strat I had which he bought from me a week later. I learned never to loan out anything of any value when a very good friend "borowed" my Les Paul Standard (1972 sunburst.. superb guitar) for a gig where they had record company people coming to probably sign them up.. and he supposedly "lost" it.. They didn't get signed and he never played a guitar again........... he can't.. something to do with a deformed hand and wrist ;) It amazes me how people can be so totally cavalier with expensive things ..
It's a lesson we all learn again from time to time. Not keen on the design of the battery compartment on that casing, needing to get the battery out with pliers is not great. Also not having reverse polarity protection I found a bit surprising.
Well, it actually does have battery protection.....the 8205A chip is installed for battery protection, although it clearly didn't work as intended (at least not for 6 months of reverse polarity protection). But the thought was there ;-)
@@englishrupe01 Typical of speaker protection schemes where the amplifier dies to protect the speakers... it would appear this device has died to protect the battery. Reverse polarity protection is a simple diode in series with the supply... it would have saved this instrument.
Those are kind of repairs I do on medical equipment. I would love to perform that repair for entertainment. Let me know if I can give it a shot and mail it back after completion. What was the second IC?
I am 💯 percent with you on borrowing tools out. I lent some tools to my neighbour and never got them back. I look after my tools and i usually find that the people who you lend the tools to, don't.
Rule 2, see rule 1. I don't lend tools. I let this one out because I didn't buy it, it was a free item that I didn't care about and it was trashed. I get called an "asshole" because I say no.
There's a polarity protection series diode on the board, but they populated a zero ohm resistor in place of it... Probably it triggered the low battery alarm too soon because of the voltage drop. They should have used a simple MOSFET polarity protection circuit, which has virtually zero voltage drop. It looks like a nice endoscope camera overall, but this is a huge design flaw. Oh, it can charge the battery. That's why they omitted the series diode xD . This board was probably designed for non-replacable battery, but they decided to put a replacable battery in it. They should have used a custom battery which cannot be inserted backwards. Silly. BTW you can buy a BMS board online for peanuts, including shipping. You can wire that in instead of repairing the on-board one. This chip seems unavailable in SOP8 package. You could probably inject a supply voltage into the board, bypassing the dead BMS, to test if the board otherwise is fine, before you buy a BMS.
Yep. I learnt this rule fairly early in life when I lent my cassette deck to someone, and it came back with a dent on the top and one of the feet broken off. OK it still worked, but they obviously hadn't treated it with care. I don't understand this. If I borrowed something from someone, I would treat it with the utmost care and wrap it up in cotton wool.
I've done that once. Lent my voltmeter to someone at work, so that another coworker ( the forklift driver, his buddy), was going over to fix his dryer. I got it back, still in the "on" position, and I noticed the DC volt selection was no longer working properly, when I went to use it, with a fresh battery. Good thing it was only a cheap hardware store meter. Never ever lend test equipment.
Gotta ask the question.....why is the scope able to destroy itself so easily? Surely a fail safe incase a reverse of battery is done accidentally?? Kind of silly on the manufacturers part.
I can not think of items where one put in the battery that the knob on the battery, the plus, is not on the inner part. It is like that on the Bose QC-15 headphones, and on all AAA and AA and 18650 battery LED flashlights. A laser temperature gun. A spice grinder. This is a rechargeable item with a own charge chip so it is not ment for taking out and change the battery for like ten years. How did he get the battery empty? Perhaps he had a son that borrowed the battery without him knowing for a flashlight and used it for a while and then put it back in the wrong way? Then it becomes genuine that he did not do anything wrong with it. But still fault at his part that he should compensate for, unless he has given lots of favors and is on the good side in the way he has given help or borrow away his car or something as friends often do without asking for gas money and so, enough to not cover it. People who can not afford to buy new items to people when it ends up not working while borrowing them, well, they should not ask for borrowing things if so happens to be. It is not illegal to not cover the cost of a new item or give what it could be worth on the used market. But it is not morally right to not do it, it is not a natural function to not do it for other than psychopaths. I would have seen that the price of the item on the used market was the price of that friendship, unless he was good on the plus side of things given in favors or things in their past. Of course the manufacturer could have put a diode in the circuit to prevent such thing from happening, but then again that battery was not ment to be taken out and recharged probably for the lifespan of this item. Perhaps both of these chips is on a Ebay step-up step-down converter board from China for like 2 USD. Perhaps he could try to bypass them chips to see if the item itself does work, and if so then add a USB charger board at the side of it for charging the battery if the chips is not the same.
@@ertyuiiknbvcx As counterexamples to your "positive in" take, consider remotes for TV equipment. When there is an "inside" of the device and the opening is on the side it's nearly certain that the negative goes on the inside. My usual go-to for polarity is that the spring is negative and this camera violates that rule.
@@eDoc2020 Yes, on those CR button type batteries it is negative in... those break that rule indeed. And it is negative in on the radios with 2x AA sylindrical shape batteries. So some break the rule.
Now he gets to buy one like he should have in the first place. Funny thing is, is you can get a USB borescope for use on a phone for about $10. Perfect Storm of idiocy, should have had polarity protection, but you probably would never have had an issue. Maybe you should enlist this persons help in future reviews to determine if a device is idiot proof. I found your channel when researching building the Elekit TU-8200 and I just wanted to say that I upgraded to the Elekit TU-8600 with the optional Lundahl opt, which was quite a big commitment financially as the price on this one doesn't include any tubes. Unlike the Pentodes found on the 8200 the Triodes can get eye-wateringly expensive, but man was it worth the investment. I'll probably never get to hear the original Western Electrics but I've heard tale of some of the original tubes still running to this day. Cheers!
perfect story for the day . They don't look after? I've experienced people SELLING my stuff !!!! or lending it to Larry and then Larry lends it to Jack.. chain of custody falls off like a game of telephone - on a side note.. I found one of these brand new in electronics recycling last year. Maybe it was one of those borrowed but not returned stories !!! 😂 Wondering if they dropped the unit onto the bottom of that making it fall out and they clumsily put it in wrong
As a teen, I loaned music tapes and cds to friends, except one friend who would hold onto said items long enough that you had to always ask for them back. He started claiming he never borrowed them to begin with. Was about 100 dollars worth in total. I waited six months to see if he would come to his senses and return them(he didn’t), so I went to the sporting goods store and bought some deer scent and one night poured it into the cowl vent on his nice hopped up muscle car. He came to school bitchin about his car smelling, and for weeks couldn’t get rid of the smell every time he fired up the heat or A/C. He ended up having to sell the car off because he couldn’t get the smell out of the ductwork in the car. Revenge is sometimes served quietly.
That sounds pretty immature. A popcorn kernal under the valve cap on all 4 car tires sends a better message. Especially when it happens nightly. No damage done but very inconvenient. Not that I have done that but a group of activists has done that recently targeting drivers of huge pickups and SUVs. They leave a note on the window telling driver they have been deflated because of all the co2 their monster trucks spew. Saw it on the news last year.
I completely understand. People used to borrow tools from me. A lot of times I never saw it again. If I borrowed tools, especially when I was an adult, I made sure I returned it to them when I was done with it. And not damaged.
I have friends to whom I loan tools and some that I do not. The friend that borrowed my cheap rivet tool and it broke- he bought me a better one to replace it. My friend that borrowed my MIG welder and it ran out of gas, and so he had my cylinder refilled? They can borrow my tools anytime!
My father told me when I was very young to never borrow anything and in the event that you absolutely have to, return it in better condition than you received it. I never lend my tools out anymore, even to my siblings.
The small chip is dual MOSFET, most likely used as li-ion battery protection even smolar 6pin chip is most likely contrils the dual MOSFET and probably also bad
Why oh why don't manufacturers add an idiot diode. Bloody bean counters. Anyway just ask that friend round and use it for its other purpose, that you pointed out. A colonoscopy!
I lend my services along with my tools, it's the only way to make sure they're used correctly it's only to family and friends. To this day all tools are still 100% (apart from general wear and tear) 🤓👍
This is why I refuse to throw away old tools and hoard them in boxes as loaners for decoy purposes. Of course, then I end up using them too and hating the fact I'm using junk instead of my nicer tools. The audacity of people is astounding though. If it was something broken while he had it, he should have owned up to it and not hidden the problem. I once damaged a cheap pipe wrench from my friend's box (it was one of those emergencies where the tool has to become sacrificial). I replaced it with Knipex and we are both happy.
Silly question.... why is there no polarity protection on the battery or on the unit to stop idiots sticking the battery in in reverse? Would love to be a fly on the wall for the conversation between you and your "friend". maybe you could offer to give him a free colonoscopy 🙂
To bad a pico fuse may have saved the electronics, some manufacturers use a diode to protect against reverse polarity. Also it is important that when using a wall wart power supply to plug the device in first and the wall wart last.
Unfortunate what happened to your inspection scope, tho I believe that would be a very manageable repair. While that SOP8 chip LP28300A may be a very hard to source part, why not bypass the 2A li-ion charger, and wire in a mini usb charging 1S module like a TP4056A module ahead of the scope's built in lithium management circuit? (a buck converter might be necessary depending on the scopes expected power supply voltage) only down draw would be slower charging. Might also find a CKCS buck converting charge module. Expensive tools are worth fixing.
I sold it as is to a viewer so someone else can source the parts. I have 2 other scopes and a new one to review is on the way. That's why i didn't bother trying to source the parts. It was a surplus unit I was going to sell. Could have got more for a working unit, i got basically shipping cost but i wasn't about to go thought the headache if sourcing parts and fixing for a tool that i would be lucky to get 40 bucks for.
Of course it may be an early prototype model which they can't sell, so they give them away for review. Later models will likely have reverse polarity protection for the salable models.
That's a nice one. Sorry you got burned. It let out the magic smoke. :-( I look at loaning anything (tools, money, etc) that it's a one way trip. If I get returned/repaid, it's great but I just write it off otherwise. Most of the time, so much time goes by after the loan that I completely forget and then wonder where the hell the tool went and I waste time looking everywhere for it.
He would no longer be considered a friend. He broke it then he needs to replace it doesn’t matter how much it cost you even if it was free, he still put battery in backwards and admitted to mistake.
So called friend' who cannot even be bothered to honor and respect you, and your friendship and do the gentlemanly thing through his mistakes is just a user/ abuser and nothing more, and the opportunity to come again, is no more; period
Had another friend that was mad at me because i wouldn't lend him my camera for his vacation. He said "you have lots". I said ok you can borrow this one. A full size VHS with a battery that only lasted 10 min.
Reminds me of a similar story, although from the other end. I switched PC PSUs with my friend, i had a more powerful one and he needed one more powerful. He was using it under full load and it crapped out, one of the mosfets exploded. I felt terrible, i went out and bought him a replacement ASAP. I just dont think its worth worsening a friendship over.
Any time someone asks to borrow something, it's a problem. If you refuse, they will think negatively of you, and if you've known the person a long time, this hurts things. If you let the person borrow, you have this problem of never getting the thing back or it being damaged. I can see the way that battery compartment is designed that putting the battery in backwards could be an "honest mistake". I've done it by accident over the years with somenot-so-well-labeled pieces of electronics but never had anything damaged as a result. If I'd been the one who had borrowed it and done this, I would have owned up to it and done whatever you'd wanted to do in order to maintain the friendship in good standing, whether that be paying you what you wanted for it, paying for you to order a new one, giving you something of equal value that you wanted, etc. I've rarely ever had a good experience with letting someone borrow anything.
On the other side of this... I used to have a laptop drive in a sleeve that I used for my music collection. A friend asked if he could copy it onto his system. So I put a sticker on it with my name, address and phone number and "Make your copy and return it immediately" ... hoping that it would be gone about 2 hours. Well, the thing disappeared for more than a year. (As I expected) Then one day I get a phone call from a total stranger. "I have your disk drive here, how do I return it" ... I said "come on over..." An hour later I had it back and as a nice bonus someone along the way had added about 500 new songs to the collection! I decided to see if I could back track it... got to about a dozen people and lost the path... Unbelievable ... that thing was *gone* except for one honest person, who is still a friend, BTW.
@@12voltvids oh damn.. that's right. I just saw the unpopulated U16 and for some reason my braain automatically went "that's reverse polarity protection diode..." but obviously not :D Double fail! :D Thanks for the video!
a good expensive device like that should have a protection built in. 1. a series diode so the device would simply not work* 2. a parallel diode that would then conduct and act as a short to blow a fuse. 3. a hybrid design using a transistor to turn on. 4. mechanical protection where the design of the plastic holder and the battery tabs would cause a reversed battery to not quite able to make contact. some devices use this method like those that use the standard 9 volt battery then minus terminal on a 9 volt battery is bigger and the interface in the device will have a strip of plastic over it so if you put the battery in wrong it wont make contact. *= diodes would require extra wiring in the device to detect the battery voltage for charging safety a simple rectifier diode used in nicd chargers would work you just have to prevent back flow and diodes are so cheap that the extra cent or fraction of cent can be passed off to the customer and manufacturer could work just 1 employee off the clock to make up for that fraction of a cent and save enough money to pay for diodes for hundreds or even thousands of devices. they can even let lapse the licensing of the use of the logo. lithium cells can dump lots of current so i am surprised that nothing burned unless the battery has protection built in. you can get 18650 cells that has a bms like board on the plus end and acts as protection to prevent the basic problem shorting, over current, over discharging and over charging and if the battery has been overdischarged it is supposed to prevent charging because with lithium battery technology the charging is the most dangerous event of it's use. ebay is a good source. you could see if digikey has a physical pickup location to avoid shipping. you could ask digikey to ship like some ebay sellers do by asking them to put the chip in an envelope and use a 50 cent stamp to pay instead of a big box. if you dont have the chip since it is a charge controller you could jumper it out with a diode and disable the charge port and just have to change out batteries. lesson learned. when loaning tools be sure not only to show them how to use the tool but if it has a battery include the charger and ask that they use the charger only instead of removing the battery. i suspect it was a cheap or low cost maybe entry level tool because a good expensive one would have protections and maybe not even have user removable battery or if it does it would be like cell phones in the 90s to the 2000s where the battery cell was molded into the plastic and clipped into the device or has a plug that connects to the device making you have to be stupid to botch it up. i looked up Teslong NTS300 Borescope Endoscope Camera and it was $89 so it is entry level. you can sell it for parts on ebay. the camera probe may be worth something especially if it is compatible with other borescopes.
Simple Solution have TWO one that works one that is crap / broken. My boss said it to me in the 1980s that he only lends broken items --- funny he said sometimes they come back FIXED. My neighbour once asked to borrow my power washer, he was upset after I told him why not, months later he lent his new power washer to his son in law, it was returned busted. I find people will not even lend me Whisky ;-)) even if I offer to return a similar coloured liquid.
All that is stopping the power is the blown 8205A Dual MosFet... you can get these for a few cents or harvest one from almost any lithium protection PCB (old Nokia phone battery, etc). Also on all TP4056 charger modules that include a DW01 protection chip. If you are never going to use the internal charger, then just bridge out the 8205A and restore power, at least for testing. There's no need to remove the cell when there is an inbuilt charger... hence why there is a screw holding the door shut.
Don't know. Possibly they can be sourced but at what cost. 1 or 2 bucks sure but the 20 to 30 shipping makes it a no go. When i fixed my old Sony TV, the one with the dead chip on the tcon board I was able to source for 1.83 and that includes shipping so i went for it. Had it been a 20 shipping charge then that tv would have been put in the bin.
I just say a plain NO! I have a garage full of tools that I've used once or twice. Your relation with people who ask for tools or anything else is much better if you say no, than when you tell them the tool is broken.
I'm curious about the component next to the battery + & - plug. That looks like the battery protection diode location but populated with a zero ohm resistor / fuse. I couldn't see the detail of the chip you said was burned out, but at first It looked like Flux residue to me. You are correct about loaning tools. I've made the same mistake myself. It's not just tools either. I've lost radio equipment in the same way. Don't do it again it's a trap !! Not only do you lose the equipment, but it's a good way to lose friendships, too.
Holy crap no reverse polarity protection... at least in the bill of materials :) Look right at the battery connector, the 0 ohm jumper, designator is D4 and below the resistor is a diode symbol
I once loaned a heavy duty extension cord to a neighbor so that he could do a simple task. It took me 1 1/2 months to get it back. When I finally did get it back the grounding lug had been cut off of the plug. I had to throw it away. NEVER AGAIN!!!
I have a hard rule I dont lend tools with a battery, motor or engine. Unless the person it well aware of the price to buy a replacement. You break it you bought it.
Wow as time goes on in watching, the plot thickens and can’t be repaired. The worst part you think you know someone and then they spit right in your face by lying.
You need better friends man. That guy sounds like an utter tool! I'd be mortified if I'd broken something I borrowed, would be getting my wallet out quick smart.
He cant be cinsidered a friend if he lies by omission. He should have at least been truthful and straight up. I would make it very well known and more expensive for him than it woulda been to replace it.
I got one better than that. When I was married, my brother in-law borrowed tools all the time. I get them back either completely filthy or broken. He would say when ask, That tool was a cheap copy.
I agree, never borrow anything to anyone, and I don't like borrowing other peoples stuff either. Sometimes accidents happen, especially when tired, have accidentally put batteries the wrong way into my digital camera, but luckily it seems to have some kind of protection, because it didn't die for that, it still works. Man I was angry to myself when I noticed I had put batteries wrong way :P Camera didn't do anything with wrong way batteries, so it was big relief when it started normally after I replaced the batteries correct way.
Went to customers house at work last week on a trouble call for malfunctioning security system, motion detectors off line. Get there found customer changed batteries. Forgot to remove plastic wrap on battery. That cost them 168.00 with tax. Geez i wish i could charge that for fixing stuff. They weren't happy about it but i billed tgem anyway as i don't need my boss on my ass about billing.
Most battery compartments are designed in such a way that the positive contact is slightly recessed. The positive bump of a battery connects fine but the flat negative simple doesn't reach inside of the hole. This provides mechanical reverse polarity protection essentially for free.
I gave it to a viewer who said he would try to fix it and as far as i know he changed the burnt parts and it is still dead. It was a surplus unit for me as i have at least 2 other ones so was not about to spend a dime on it because i got it for free
I don't know if you know this or not, but sometimes, depending on the company, suppliers will sample a part or two if you ask them. I've done that lots of times needing parts before. Could be worth a try...
I learned my lesson when I lent my Yamaha scooter and they brought it back completely destroyed, the cost to fix it was pretty much the same as buying a new one, so I had to walk for a few months
Man, if I broke anything I borrowed, I would assume responsibility. Some people have no conscience.
Same here. Had to quickly borrow a drill from a neighbor like 25 years ago because mine failed for like the last hole. I couldn't continu and I asked him if I could use his for 1 hole. The machine that he gave me was like 20 years old back then. I think I screwed up somehow since it stopped and started the old mechanical smell thing. I put on other clothes drove to a store that was open, on a Sunday it was not easy back then, bought a higher powered and certainly way more expensive machine and gave it to him together with a good bottle of wine. Even then I was really embarassed since I am so careful with my own stuff. And own stuff means attached stories to it in my case.
I once lend out a camcorder like 20 years ago and out of the blue received it back last year in a plastic bag. I didn't even try if it still worked.
And yes, the stuff that I lend out, even electronic stuff, never comes back. Couple of months ago I asked my Linux sattelite receiver back, that was brand new, that I installed and configured so that the person could watch free to air stuff. I spend hours and hours configuring, adjusting and explaining. I installed that like 6 years ago. When I wanted it back he said he didn't know what it was and that I could go ... myself.. And there is plenty more missing that I worked pretty hard for.
Totally agree. If you break it you fix it or buy a new one !
What have you broken that you borrowed and then replaced or repaired?
I loaned my brand new little giant ($650) 16 foot aluminum A , he painted his interior and it was covered with paint when i went to pick it up
I remember when I was a child my father gave me a word of wisdom. He said never loan anything unless you can afford to lose it. I did anyway and learned my lesson.Sorry that happened to you-I know the experience .Some borrowers don't give 2 craps.
I made the rule after 40 years ago i loaned my pressure washer to a friend and they loaned it it to another friend when it came back it was broken. Friend 1 blamed friend 2. Friend 2 said he couldn't use it as it was broken. Was on friend 1 for years trying to get it replaced and he refused. Friend 2 was so pissed at friend 1 for passing the buck he never talked to him again. Friend one died a few years ago. Guess I'm not getting a new pressure washer from him.
@@12voltvids - Humans....
@@12voltvids lent out a jackhammer/drill....came back, no more jackhammer function.
This is also exactly what happens when you're smart enough to use without breaking finnicky quirky chinese low quality tools. People around you watch you using them and think they can do the same as you.
(Refreshing change to see the word "lose" spelt correctly. It's dogs nuts and bolts are "loose"
It's a pity that a tool in which you can put the battery backwards doesn't have a clear label giving polarity and some protection. It could be just a reverse diode and a fuse...
If it can be shoved in backwards forcibly, padded with the wrong size, Hooked up to an external power source, or in ANY WAY mucked about with.. It will be.
The "pity" is that this has become acceptable behaviour. And the manual flinging "I'm not a kid" majority have brought this on themselves.
A diode would possibly have saved it. But that is an extra cost. And the other dozen companies making the same thing will leave it out, saving 10 cents per unit.
A fuse would require access to replace, and that adds to the unit cost, and the competition will omit it, and undercut you.
and if it fails due to dumbassery.. New unit sold..
Cha-ching!
Profit is the wholesale price minus the cost to manufacture and deliver.
Save a few pennies on the right side of the line, that becomes profit.
Can't really fault companies for this. Smart people will check polarity. Dumb people will increase sales.
That fried IC being a charging control means the power flow to that battery had to be bi-directional so a simple series diode to block reverse voltage would also prevent charging current going back out. I assume whatever charger this thing used must have plugged into the unit someplace rather than the user supposed to pull out the battery?.
@@JohnBailey39 The terrible thing the manufacturer did is have the polarity the _opposite_ of what's expected. 99% of the time the spring goes to the negative and the few exceptions I've seen are clearly marked. Better handling of the polarity might add a few cents to the device cost but it would cut down on support costs. Blaming the customer for doing the obvious thing is an easy way for them to advocate against buying your product.
The 8205A Dual Mosfet package (also blown, near the power connector) is the reverse polarity protection. All he needs to do is replace that and power will be restored. That chip is used in almost all small lithium protection PCBs, so they are as common as dirt.
It's actually a very simple one component fix. Reverse battery protection I used MOSFET IRFU902P33F-NO with Gate connected to Source.
Make the borrower(s) pay... They messed up with your work equipment so they should be responsible
For me it’s not loosing the tool that’s the issue. It’s the disappointment when someone lies in your face that you might have considered an friend. I have no idea how anyone can do that tho. If it was me I would have been so sad I destroyed it and done anything in my power to fix the issue/replace it and then some. I guess different people have different values sadly.
Right? Just own up to your mistakes. We all make 'm. Being a little weasel about it makes you a c....
I have a relative who was a notorious borrower. He broke EVERYTHING he was ever lent. Riding mower, came back with a stripped gearbox. Weed-whacker, came back with a bent shaft like a cork screw. Axe he borrowed & never gave back. Found years later hidden. it's head tucked away with the handle missing. Broke clean off. Even wrenches & hammers... if it left your sight and he laid hands on it, it was doomed. 🤨
...and apparently you just keep feeding him your tools to break...and then blaming him for breaking them...amazing.
I think what would have pissed me off even more than my equipment not working is the fact that he tried to "play stupid" and lie his way out of any wrongdoing. If I were in your position, the guy being straight up about what happened would have been much easier to take than him lying his butt off. I'm not one to ask to borrow things, but if I borrowed something and something happened to it while it was in my care, I'd feel obligated to pay to have it repaired or replaced. My Dad was a woodworker and there were two people who he'd loan something to, because he knew that if something happened to the item, they'd make it right.
Totally agree with you. 100%
I learned that the people who get angry when you don't want to lend them something are just the people you shouldn't lend things to, because they are showing that they have no respect for you.
I can't believe his response was something along the lines of "you didn't pay anything for it." He should have at least offered to pay for your bench time troubleshooting it!
I hear you and I agree. As a small boy my dad strongly taught me not to lend tools out. And I’ve pretty much stuck to that rule for 50+ years, and after a few costly lessons too. Shame that manufacturer left the reverse polarity protection out of their design. “…well you shouldn’t have loaned it to me”, yes and next time I won’t.
it amazes me how people just dont give a shit about other peoples property. I mean, it just further strengthens my case on how human beings are scum, we are worse than animals.
Usually comes from having an overindulgent mother and/or father.
I lent my Snap-On torque wrench to a 'friend' and I expressly told him "set the torque, do the work, then turn it back to zero when you're done" He agreed, then I got it back a couple weeks later and I opened the case and it was still set to 100 lbft and I lost it on him. Needless to say he's no longer a friend. He told me I was over-reacting, but I told him he had utter contempt for the value of other people's tools as it's worth nothing to him. I also loaned an engine stand to another 'friend' and never got it back cuz he thought that because he was getting a divorce, meant I'd understand that I somehow forfeited it cuz he desparately needs the $$ now. Divorce charity I guess, WTF?
That forced de-wedding gift...
Good friends are hard to come by.
i have loaned out tools that were never returned and vinyl records that i never saw again. i learned that lesson long, long ago. i have given away working electronics
to people and they just trashed them. no more. if someone wants to "borrow" some money, it means you will never get it back. been there, done that too.
Learned the money thing with my daughter. Got a big ticket for speeding and didn't pay so could not renew license till ticket paid. Wife loaned her the money. Have never seen it again. When she got caught speeding a second time and had car impounded she called for a hand out and I said sure after you pay back the previous ticket. She got the money from her boy friend.
Back in the 80's I was in a local rock band. Our guitar player was a bit of an idiot and anyway.. this one night at the town hall.. biggest gig they had ever had during the soundcheck he pulled this "trick" he had apparently seen done by some other crap glam rock band guitar player.. result.. headstock of his not exactly cheap Charvel guitar going nose first into the stage.. shattering.. and being scattered in bits across the room..
He then proceeded to ask me if he could "borrow" my USA 1967 Strat ( a blue paisley one.. really rare.. my pride and joy which was why I never gigged it) and got upset when I told him flat NO !!
One of the other bands guitarists took pity on him and loaned him his really expensive proper Jackson.. Idiot tries the same stunt immediately.. the results?.. well who could have guessed?..
We didn't play that night due to having no guitar player who was up the hospital with two broken arms...
I loaned the guitar player in the other band a rather ratty looking but pretty decent Peter Cook (UK reknowned luthier back in the day. they make stupid money now but mine was rough looking having been gigged a lot) Strat I had which he bought from me a week later.
I learned never to loan out anything of any value when a very good friend "borowed" my Les Paul Standard (1972 sunburst.. superb guitar) for a gig where they had record company people coming to probably sign them up.. and he supposedly "lost" it.. They didn't get signed and he never played a guitar again........... he can't.. something to do with a deformed hand and wrist ;)
It amazes me how people can be so totally cavalier with expensive things ..
You broke his hand?
It's a lesson we all learn again from time to time. Not keen on the design of the battery compartment on that casing, needing to get the battery out with pliers is not great. Also not having reverse polarity protection I found a bit surprising.
Definitely a flaw in the design ... although I did notice a 0 ohm resistor soldered on pads marked D1 ... like maybe they had it but didn't use it.
Well, it actually does have battery protection.....the 8205A chip is installed for battery protection, although it clearly didn't work as intended (at least not for 6 months of reverse polarity protection). But the thought was there ;-)
Thanks for the information.
@@englishrupe01
Typical of speaker protection schemes where the amplifier dies to protect the speakers... it would appear this device has died to protect the battery.
Reverse polarity protection is a simple diode in series with the supply... it would have saved this instrument.
I feel for you on this one. I've had similar situations happen to me. So now I never loan anything that is of use or value to me.
That's the only reason this one was loaned. The other one with the 3 cameras on the end doesn't leave my hands.
There should have been a fuse on that part of the circuit.
But but but then they couldn't sell a new one when someone stuck the battery in backwards.
Exactly. Manufacturers who accidently omit the part stay in business longer because they get repeat orders.
Rule 2: If you are going to loan tools, only loan the broken ones. If they are serious they will fix to use.
Those are kind of repairs I do on medical equipment. I would love to perform that repair for entertainment. Let me know if I can give it a shot and mail it back after completion. What was the second IC?
I am 💯 percent with you on borrowing tools out. I lent some tools to my neighbour and never got them back.
I look after my tools and i usually find that the people who you lend the tools to, don't.
Rule 2, see rule 1.
I don't lend tools. I let this one out because I didn't buy it, it was a free item that I didn't care about and it was trashed.
I get called an "asshole" because I say no.
@@12voltvidsThose guys shouldn‘t be called friends!
@@Elektrotechniker If I eliminated them i would have few left.
@@12voltvids Well, you've got us 🤗 😬
@@12voltvids Better than none.
There's a polarity protection series diode on the board, but they populated a zero ohm resistor in place of it... Probably it triggered the low battery alarm too soon because of the voltage drop. They should have used a simple MOSFET polarity protection circuit, which has virtually zero voltage drop. It looks like a nice endoscope camera overall, but this is a huge design flaw.
Oh, it can charge the battery. That's why they omitted the series diode xD . This board was probably designed for non-replacable battery, but they decided to put a replacable battery in it. They should have used a custom battery which cannot be inserted backwards. Silly. BTW you can buy a BMS board online for peanuts, including shipping. You can wire that in instead of repairing the on-board one. This chip seems unavailable in SOP8 package.
You could probably inject a supply voltage into the board, bypassing the dead BMS, to test if the board otherwise is fine, before you buy a BMS.
Yep. I learnt this rule fairly early in life when I lent my cassette deck to someone, and it came back with a dent on the top and one of the feet broken off. OK it still worked, but they obviously hadn't treated it with care. I don't understand this. If I borrowed something from someone, I would treat it with the utmost care and wrap it up in cotton wool.
I've done that once. Lent my voltmeter to someone at work, so that another coworker ( the forklift driver, his buddy), was going over to fix his dryer. I got it back, still in the "on" position, and I noticed the DC volt selection was no longer working properly, when I went to use it, with a fresh battery. Good thing it was only a cheap hardware store meter. Never ever lend test equipment.
Gotta ask the question.....why is the scope able to destroy itself so easily? Surely a fail safe incase a reverse of battery is done accidentally?? Kind of silly on the manufacturers part.
Totally agree. Poor design.
I can not think of items where one put in the battery that the knob on the battery, the plus, is not on the inner part. It is like that on the Bose QC-15 headphones, and on all AAA and AA and 18650 battery LED flashlights. A laser temperature gun. A spice grinder.
This is a rechargeable item with a own charge chip so it is not ment for taking out and change the battery for like ten years. How did he get the battery empty?
Perhaps he had a son that borrowed the battery without him knowing for a flashlight and used it for a while and then put it back in the wrong way?
Then it becomes genuine that he did not do anything wrong with it. But still fault at his part that he should compensate for, unless he has given lots of favors and is on the good side in the way he has given help or borrow away his car or something as friends often do without asking for gas money and so, enough to not cover it.
People who can not afford to buy new items to people when it ends up not working while borrowing them, well, they should not ask for borrowing things if so happens to be.
It is not illegal to not cover the cost of a new item or give what it could be worth on the used market.
But it is not morally right to not do it, it is not a natural function to not do it for other than psychopaths.
I would have seen that the price of the item on the used market was the price of that friendship, unless he was good on the plus side of things given in favors or things in their past.
Of course the manufacturer could have put a diode in the circuit to prevent such thing from happening, but then again that battery was not ment to be taken out and recharged probably for the lifespan of this item.
Perhaps both of these chips is on a Ebay step-up step-down converter board from China for like 2 USD.
Perhaps he could try to bypass them chips to see if the item itself does work, and if so then add a USB charger board at the side of it for charging the battery if the chips is not the same.
@@ertyuiiknbvcx As counterexamples to your "positive in" take, consider remotes for TV equipment. When there is an "inside" of the device and the opening is on the side it's nearly certain that the negative goes on the inside. My usual go-to for polarity is that the spring is negative and this camera violates that rule.
@@eDoc2020 Yes, on those CR button type batteries it is negative in... those break that rule indeed. And it is negative in on the radios with 2x AA sylindrical shape batteries. So some break the rule.
@@ertyuiiknbvcx I wasn't talking about button or coin cells, just regular AA/AAA cells.
Love,honesty, and respect are gone.
As a general rule, you do not loan out your Wife, your tools, or your guns, or car. To anyone. Ever.
Your tools, guns or car will never lend themselves out!😇
Now I have the image in my head of a guy bent over trying to give himself a colonoscopy with this device!! LMAO!!
Now he gets to buy one like he should have in the first place. Funny thing is, is you can get a USB borescope for use on a phone for about $10. Perfect Storm of idiocy, should have had polarity protection, but you probably would never have had an issue. Maybe you should enlist this persons help in future reviews to determine if a device is idiot proof.
I found your channel when researching building the Elekit TU-8200 and I just wanted to say that I upgraded to the Elekit TU-8600 with the optional Lundahl opt, which was quite a big commitment financially as the price on this one doesn't include any tubes. Unlike the Pentodes found on the 8200 the Triodes can get eye-wateringly expensive, but man was it worth the investment. I'll probably never get to hear the original Western Electrics but I've heard tale of some of the original tubes still running to this day. Cheers!
perfect story for the day . They don't look after? I've experienced people SELLING my stuff !!!! or lending it to Larry and then Larry lends it to Jack.. chain of custody falls off like a game of telephone - on a side note.. I found one of these brand new in electronics recycling last year. Maybe it was one of those borrowed but not returned stories !!! 😂 Wondering if they dropped the unit onto the bottom of that making it fall out and they clumsily put it in wrong
As a teen, I loaned music tapes and cds to friends, except one friend who would hold onto said items long enough that you had to always ask for them back. He started claiming he never borrowed them to begin with. Was about 100 dollars worth in total.
I waited six months to see if he would come to his senses and return them(he didn’t), so I went to the sporting goods store and bought some deer scent and one night poured it into the cowl vent on his nice hopped up muscle car. He came to school bitchin about his car smelling, and for weeks couldn’t get rid of the smell every time he fired up the heat or A/C. He ended up having to sell the car off because he couldn’t get the smell out of the ductwork in the car. Revenge is sometimes served quietly.
That sounds pretty immature. A popcorn kernal under the valve cap on all 4 car tires sends a better message. Especially when it happens nightly. No damage done but very inconvenient. Not that I have done that but a group of activists has done that recently targeting drivers of huge pickups and SUVs. They leave a note on the window telling driver they have been deflated because of all the co2 their monster trucks spew. Saw it on the news last year.
You can tell someone that had an unintended use for this, they'll be walking with a very strange gait. 😆
I completely understand. People used to borrow tools from me. A lot of times I never saw it again. If I borrowed tools, especially when I was an adult, I made sure I returned it to them when I was done with it. And not damaged.
Another thing you never lend.... Money. That's actually rule 1, the tools is 2. Lend money and you will never see it again.
@@12voltvids can I borrow 6000
I have friends to whom I loan tools and some that I do not. The friend that borrowed my cheap rivet tool and it broke- he bought me a better one to replace it. My friend that borrowed my MIG welder and it ran out of gas, and so he had my cylinder refilled? They can borrow my tools anytime!
Like a good neighbor, Broken Bore Scope is there.
My father told me when I was very young to never borrow anything and in the event that you absolutely have to, return it in better condition than you received it. I never lend my tools out anymore, even to my siblings.
Person A: "I don't own any tools. Can I borrow some?"
Person B: "That's why I don't loan tools. No, go buy some."
Check out what the other chip is for, and try to feed supply voltage directly from your bench psu. (1.8V? 3.3V?)
The small chip is dual MOSFET, most likely used as li-ion battery protection even smolar 6pin chip is most likely contrils the dual MOSFET and probably also bad
i've seldom agreed with you on anything as much as here... and 'kentucky fried chip' is pretty good :D
Why oh why don't manufacturers add an idiot diode. Bloody bean counters. Anyway just ask that friend round and use it for its other purpose, that you pointed out. A colonoscopy!
Lol!! 😂😂👍👍
I lend my services along with my tools, it's the only way to make sure they're used correctly it's only to family and friends.
To this day all tools are still 100% (apart from general wear and tear) 🤓👍
This is why I refuse to throw away old tools and hoard them in boxes as loaners for decoy purposes. Of course, then I end up using them too and hating the fact I'm using junk instead of my nicer tools.
The audacity of people is astounding though. If it was something broken while he had it, he should have owned up to it and not hidden the problem.
I once damaged a cheap pipe wrench from my friend's box (it was one of those emergencies where the tool has to become sacrificial). I replaced it with Knipex and we are both happy.
Silly question.... why is there no polarity protection on the battery or on the unit to stop idiots sticking the battery in in reverse? Would love to be a fly on the wall for the conversation between you and your "friend". maybe you could offer to give him a free colonoscopy 🙂
Kind of a shame, there are a lot of people who might need something like that only once. The least he could have done is be honest.
I was thinking that rule number 1 is if it works do not touch ahhaha
I don't loan out tools, either. Doesn't stop my little brother from just walking off with them, though.
"Look how they massacred my boy"
To bad a pico fuse may have saved the electronics, some manufacturers use a diode to protect against reverse polarity. Also it is important that when using a wall wart power supply to plug the device in first and the wall wart last.
Unfortunate what happened to your inspection scope, tho I believe that would be a very manageable repair. While that SOP8 chip LP28300A may be a very hard to source part, why not bypass the 2A li-ion charger, and wire in a mini usb charging 1S module like a TP4056A module ahead of the scope's built in lithium management circuit? (a buck converter might be necessary depending on the scopes expected power supply voltage) only down draw would be slower charging. Might also find a CKCS buck converting charge module. Expensive tools are worth fixing.
I sold it as is to a viewer so someone else can source the parts. I have 2 other scopes and a new one to review is on the way. That's why i didn't bother trying to source the parts. It was a surplus unit I was going to sell. Could have got more for a working unit, i got basically shipping cost but i wasn't about to go thought the headache if sourcing parts and fixing for a tool that i would be lucky to get 40 bucks for.
Of course it may be an early prototype model which they can't sell, so they give them away for review. Later models will likely have reverse polarity protection for the salable models.
That's a nice one. Sorry you got burned. It let out the magic smoke. :-( I look at loaning anything (tools, money, etc) that it's a one way trip. If I get returned/repaid, it's great but I just write it off otherwise. Most of the time, so much time goes by after the loan that I completely forget and then wonder where the hell the tool went and I waste time looking everywhere for it.
That's why i have rule 1.
Good video I had similar problem with a neighbor years ago with a circular saw.
He would no longer be considered a friend. He broke it then he needs to replace it doesn’t matter how much it cost you even if it was free, he still put battery in backwards and admitted to mistake.
"Never a borrower or a lender be!"
They mean money here, but the same can be said about stuff as well! 👍👍
So called friend' who cannot even be bothered to honor and respect you, and your friendship and do the gentlemanly thing through his mistakes is just a user/ abuser and nothing more, and the opportunity to come again, is no more; period
Had another friend that was mad at me because i wouldn't lend him my camera for his vacation. He said "you have lots". I said ok you can borrow this one. A full size VHS with a battery that only lasted 10 min.
8-))
Good job bhai ❤❤❤❤
Reminds me of a similar story, although from the other end. I switched PC PSUs with my friend, i had a more powerful one and he needed one more powerful. He was using it under full load and it crapped out, one of the mosfets exploded. I felt terrible, i went out and bought him a replacement ASAP.
I just dont think its worth worsening a friendship over.
Sorry about your Scope. It looks like a nice piece of electronics. (You're an awesome electronics guy). Thank you for your videos.
I have the same rule and people get offeneded when you say no, but when you trust people they always mess it up
Any time someone asks to borrow something, it's a problem. If you refuse, they will think negatively of you, and if you've known the person a long time, this hurts things. If you let the person borrow, you have this problem of never getting the thing back or it being damaged. I can see the way that battery compartment is designed that putting the battery in backwards could be an "honest mistake". I've done it by accident over the years with somenot-so-well-labeled pieces of electronics but never had anything damaged as a result. If I'd been the one who had borrowed it and done this, I would have owned up to it and done whatever you'd wanted to do in order to maintain the friendship in good standing, whether that be paying you what you wanted for it, paying for you to order a new one, giving you something of equal value that you wanted, etc. I've rarely ever had a good experience with letting someone borrow anything.
On the other side of this... I used to have a laptop drive in a sleeve that I used for my music collection. A friend asked if he could copy it onto his system. So I put a sticker on it with my name, address and phone number and "Make your copy and return it immediately" ... hoping that it would be gone about 2 hours.
Well, the thing disappeared for more than a year. (As I expected)
Then one day I get a phone call from a total stranger. "I have your disk drive here, how do I return it" ... I said "come on over..." An hour later I had it back and as a nice bonus someone along the way had added about 500 new songs to the collection!
I decided to see if I could back track it... got to about a dozen people and lost the path...
Unbelievable ... that thing was *gone* except for one honest person, who is still a friend, BTW.
Yep you broke your own rule! Sorry to see that unit go the the recycler...
3.67 volts....thats nominal....approximately 50% state of charge. Good to go.
Kentucky Fried Chip!! Love it! I guess if your was then but not now friend asks to borrow the other scope, if would be a flat NO lol.
I'll give him the broken one and laugh when he brings it back and says it doesn't work. I'll give ur away for parts. The camera works.
Sometimes the entire board with all of the components can be cheaper than the individual pieces
And this is exactly why I no longer lend out anything more complex than a paper clip!
Kind of a stupid design choice to save half a cent on a diode to protect it from reverse polarity though...
Well considering the battery wasn't designed to be removed, it has an internal charger.
I love it that the reverse polarity protection diode is NOT installed... what a load of bull :D
What reverse protection diode!......
FAIL!
@@12voltvids oh damn.. that's right. I just saw the unpopulated U16 and for some reason my braain automatically went "that's reverse polarity protection diode..." but obviously not :D
Double fail! :D
Thanks for the video!
a good expensive device like that should have a protection built in.
1. a series diode so the device would simply not work*
2. a parallel diode that would then conduct and act as a short to blow a fuse.
3. a hybrid design using a transistor to turn on.
4. mechanical protection where the design of the plastic holder and the battery tabs would cause a reversed battery to not quite able to make contact.
some devices use this method like those that use the standard 9 volt battery then minus terminal on a 9 volt battery is bigger and the interface in the device will have a strip of plastic over it so if you put the battery in wrong it wont make contact.
*= diodes would require extra wiring in the device to detect the battery voltage for charging safety
a simple rectifier diode used in nicd chargers would work you just have to prevent back flow and diodes are so cheap that the extra cent or fraction of cent can be passed off to the customer and manufacturer could work just 1 employee off the clock to make up for that fraction of a cent and save enough money to pay for diodes for hundreds or even thousands of devices.
they can even let lapse the licensing of the use of the logo.
lithium cells can dump lots of current so i am surprised that nothing burned unless the battery has protection built in.
you can get 18650 cells that has a bms like board on the plus end and acts as protection to prevent the basic problem shorting, over current, over discharging and over charging and if the battery has been overdischarged it is supposed to prevent charging because with lithium battery technology the charging is the most dangerous event of it's use.
ebay is a good source.
you could see if digikey has a physical pickup location to avoid shipping.
you could ask digikey to ship like some ebay sellers do by asking them to put the chip in an envelope and use a 50 cent stamp to pay instead of a big box.
if you dont have the chip since it is a charge controller you could jumper it out with a diode and disable the charge port and just have to change out batteries.
lesson learned.
when loaning tools be sure not only to show them how to use the tool but if it has a battery include the charger and ask that they use the charger only instead of removing the battery.
i suspect it was a cheap or low cost maybe entry level tool because a good expensive one would have protections and maybe not even have user removable battery or if it does it would be like cell phones in the 90s to the 2000s where the battery cell was molded into the plastic and clipped into the device or has a plug that connects to the device making you have to be stupid to botch it up.
i looked up Teslong NTS300 Borescope Endoscope Camera and it was $89 so it is entry level.
you can sell it for parts on ebay.
the camera probe may be worth something especially if it is compatible with other borescopes.
Will never know as I gave it away
Simple Solution have TWO one that works one that is crap / broken. My boss said it to me in the 1980s that he only lends broken items --- funny he said sometimes they come back FIXED.
My neighbour once asked to borrow my power washer, he was upset after I told him why not, months later he lent his new power washer to his son in law, it was returned busted.
I find people will not even lend me Whisky ;-)) even if I offer to return a similar coloured liquid.
I loaned out my EICO test equipment and BK tube tester to a co worker none of it was ever returned. Don't loan tools either they get lost or broken.
All that is stopping the power is the blown 8205A Dual MosFet... you can get these for a few cents or harvest one from almost any lithium protection PCB (old Nokia phone battery, etc). Also on all TP4056 charger modules that include a DW01 protection chip.
If you are never going to use the internal charger, then just bridge out the 8205A and restore power, at least for testing. There's no need to remove the cell when there is an inbuilt charger... hence why there is a screw holding the door shut.
Great send me one for 2 cents.
Local shops do not carry. Shipping a 2 cent part is 30.00 from mouser and digikey.
I used to keep an extra, crap tool kit. If anyone requested a tool loan, they got one from there.
like what Homer Simpson does to his good friend Ned Flanders
Hi Dave, it's a long shot, but can you source the chip/chips ?
Don't know. Possibly they can be sourced but at what cost. 1 or 2 bucks sure but the 20 to 30 shipping makes it a no go. When i fixed my old Sony TV, the one with the dead chip on the tcon board I was able to source for 1.83 and that includes shipping so i went for it. Had it been a 20 shipping charge then that tv would have been put in the bin.
"YoU gOt It FoR fReE"
Fine. Then replace it for free.
I just say a plain NO! I have a garage full of tools that I've used once or twice. Your relation with people who ask for tools or anything else is much better if you say no, than when you tell them the tool is broken.
Never loan out tools or records. Either they come back damaged or they never come back at all.
I'm curious about the component next to the battery + & - plug. That looks like the battery protection diode location but populated with a zero ohm resistor / fuse. I couldn't see the detail of the chip you said was burned out, but at first It looked like Flux residue to me. You are correct about loaning tools. I've made the same mistake myself. It's not just tools either. I've lost radio equipment in the same way. Don't do it again it's a trap !! Not only do you lose the equipment, but it's a good way to lose friendships, too.
The chip had a hole burned in it.
@12voltvids Thank you. Yes, I understand that. What about the 0 ohm / fuse component? What was its condition ?
@@KB1UIF it was not popped.
Holy crap no reverse polarity protection... at least in the bill of materials :)
Look right at the battery connector, the 0 ohm jumper, designator is D4 and below the resistor is a diode symbol
To their defence the battery is not supposed to be removed untill the unit is recycled.
I once loaned a heavy duty extension cord to a neighbor so that he could do a simple task. It took me 1 1/2 months to get it back. When I finally did get it back the grounding lug had been cut off of the plug. I had to throw it away. NEVER AGAIN!!!
You could have just bought a new plug abd changed it in about 5 minutes.
The company I was with lending tools was a big no-no.
I don’t borrow other people’s stuff because things break, it’s what they do. I don’t want to have to replace someone’s crap with a new item.
That's right. There's now so much rubbish chinese tools flooding the market
I have a hard rule I dont lend tools with a battery, motor or engine. Unless the person it well aware of the price to buy a replacement. You break it you bought it.
Wow as time goes on in watching, the plot thickens and can’t be repaired. The worst part you think you know someone and then they spit right in your face by lying.
'It ran when I parked it.'
Only take the cash into a casino that you can afford to lose.
Only "lend" tools you can afford to lose.
That's sad. But, a simply diode on the battery connector could it save from inverse polarity?
Take that up with the engineer that designed it not me.
Yeah, I know. It was technical question, because I see only a fuse on the main 5v rail. I don't think it's enough@@12voltvids
@@Naitoraven951 this one has been disposed of now so we will never know.
You need better friends man. That guy sounds like an utter tool! I'd be mortified if I'd broken something I borrowed, would be getting my wallet out quick smart.
That's the way to do it you break it you bought it.
When the borrowers try to avoid you then that’s a sign they broke it and aren’t worried about replacing it.
He cant be cinsidered a friend if he lies by omission. He should have at least been truthful and straight up. I would make it very well known and more expensive for him than it woulda been to replace it.
I got one better than that. When I was married, my brother in-law borrowed tools all the time. I get them back either completely filthy or broken. He would say when ask, That tool was a cheap copy.
Heard that one before. I'll use that one next time i borrow a tool and break it
@@12voltvids I'm surprised that the circuit didn't have better protection for reverse polarity mistakes.
@@dalemettee1147 well the battery is not supposed to be removed. It has an onboard charger. Supposed to just plug into USB.
My ex brother in-law was just like that, unfortunately his sister wasn't any better, she also borrowed other mans tool.
@@BrainHurricanes ya but that man loaned "his tool" willingly.
Yeah that’s a Kentucky fried chip if I ever seen one lmfao, love it.
Little overdone for my liking.
I agree, never borrow anything to anyone, and I don't like borrowing other peoples stuff either.
Sometimes accidents happen, especially when tired, have accidentally put batteries the wrong way into my digital camera, but luckily it seems to have some kind of protection, because it didn't die for that, it still works.
Man I was angry to myself when I noticed I had put batteries wrong way :P
Camera didn't do anything with wrong way batteries, so it was big relief when it started normally after I replaced the batteries correct way.
Went to customers house at work last week on a trouble call for malfunctioning security system, motion detectors off line. Get there found customer changed batteries. Forgot to remove plastic wrap on battery. That cost them 168.00 with tax. Geez i wish i could charge that for fixing stuff.
They weren't happy about it but i billed tgem anyway as i don't need my boss on my ass about billing.
Most battery compartments are designed in such a way that the positive contact is slightly recessed. The positive bump of a battery connects fine but the flat negative simple doesn't reach inside of the hole. This provides mechanical reverse polarity protection essentially for free.
@@eDoc2020 you said it.... Most. Not all
Digikey sells individual parts and I think mouser does as well. You probably tossed it by now but those are usually my two sources for oddball parts.
I gave it to a viewer who said he would try to fix it and as far as i know he changed the burnt parts and it is still dead. It was a surplus unit for me as i have at least 2 other ones so was not about to spend a dime on it because i got it for free
I like watching you repair cameras more 😛😋
As they say, never lend what you can't afford to give. Too bad some "friends" have to be lying sacks of garbage, though...
with that name , chinesium , imnot suprised it broke ...
I don't know if you know this or not, but sometimes, depending on the company, suppliers will sample a part or two if you ask them. I've done that lots of times needing parts before. Could be worth a try...
Can't be bothered at this point. I was hoping it was a flipped diode or a popped protector.
I learned my lesson when I lent my Yamaha scooter and they brought it back completely destroyed, the cost to fix it was pretty much the same as buying a new one, so I had to walk for a few months
The murder of the story is do not lend expensive equipment to anyone