how to test LED strips without tester Using a battery. backlight tester DIY
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- เผยแพร่เมื่อ 26 ส.ค. 2024
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Here's to those that don't want to invest in a led tester. Still works just as good. Message me for questions.
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Thank you for all of your vids. I'm on my 5th TV fixing. Found them all in the garbage. Selling them on craigslist. Making a small profit and helping the environment, even if it's a little bit.
That's awesome! Keep it going!
repaired a free 4k 55" toshiba with this man, thank you so much
Great video man! I'm an electronics technician myself and that's a great solution to apply the necessary voltage with "low current" to test the led strips! I'm actually getting ready to troubleshoot a Samsumg Smart TV that has a brightness issue and this a great video if you don't have a variable power supply or led tester. So, thanks for posting this video man! God bless.
Thanks chris, for the comment. let me know if you need any help. BTW what model number do you have?
@@TECHIELIFE Yeah absolutely! It's a Samsung UN40EH5300. I've also got a cool idea for you if you ever need it. I've used a 9v battery before with a set of alligator clips as a long range continuity tester. You just clip the two sets in half, solder or wrap two leads to the battery and get a small DC piezoelectric buzzer and solder or wrap the other two leads to that. Boom. Instant long range continuity tester!
@@MrCcarter7 neat idea.
@@TECHIELIFE Yeah I used to work at a tv station and multimeter leads just weren't long enough when running and terminating audio wire from one room to another.
Hell is this a cool solution!
I salute you, you saved my day!
Instead of buying a power supply for 100 bucks or paying a professional I just checked the screen backlight with literally zero effort in no time.
Thank you!
Thanks!
Nice tip!!! Bout to use this method right now, so it looks like all the fire alarms in my house are gonna be without batteries because that is the only place I can think of these kind of batteries on hand lol
I love battery sequence I never thought of connecting them that way
Super creative, quick-and-dirty solution! Love it! Definitely gonna try this out with TV I found.
This is hella useful. In-laws gave us their old obscenely large Sony tv because the screen has gone purple. Figure I need to replace the LEDs.
Love the 9v battery stacking trick, the MacGyver is strong in you. :-)
i dont mean to be off topic but does any of you know of a way to log back into an instagram account?
I somehow forgot my login password. I love any help you can offer me.
@Nikolai Maximus Instablaster =)
I was thinking of this but didn't put enough batteries together... I could not find any info on the web about the voltage.. but you came thru... I'm a scrapper, i'll use these in my camper now.. they are too cool! thank you !!!
Awesome glad I could help!.
you are pretty good i but i would recommend putting the smartphone on a tripod so we dont get our heads spinngin by the constant moving of the phonej. but what an awesome idea
Great idea and thanks. I used a pair of AA's and some really sharp probes to test one led at a time. Finds the problem child each time.
great idea..i just used a 12v ac adapter and strip the end off and it works fine for doing 1 strip at a time and just do each strip ...i like your 9v method too....i also do what you did by jumpering the bad led..it wont really matter..you wouldnt notice it...
Great video! I was considering to buy a tester with priority shipping but this will definitely save time and money to fix an old Vizio TV with backlight problems. I’ll still get the tester but it can get here whenever, now. Thanks for the bonus trick with the bridged LED solder. Considering I am fixing an old TV, I rather spend towards a new one once this one is not worth fixing anymore.
Thanks very helpful tip with the 9 volt batteries and the very clear explanation, my cheap Samsung led tv went out yesterday and with the help of TH-cam I'm trying to fix it, if only something to do, and the video just saved me so money 💰 😀
Very nice DYI tester, tested all of my strips found the problem very fast, thank you. :)
You can also use your phone charger + usb to test them , basically cut the usb cable you'll have 4 wires use the black and red as positive and negative. And job done
@Sam S I don’t understand the point you’re making on how it’s a bad idea to do this. How are they fundamentally different at all, it seems like the same thing to me? It kinda seems like your point is, that it would be bad if, while you were connecting the wires to the backlights, the voltage happened the vary. But you say yourself that the voltage is constant, and the phone itself regulates it, so without the phone in the picture there would be no need to worry about the voltage varying
Awesome job! I had watched 4 videos before yours and yours was better than all 4 Combined
Thanks for the feedback!
Very nice job . We have this kind of led strips tester .
Works wonders.
This method might work, but I would not recommend it. If you want to use a battery to check LEDs, use two AA, C, or D batteries instead of a 9-volt triple pack. With the 27 volts that are produced with three 9-volt batteries, if the string you are testing has only 5 good LEDs working, you will be supplying them with nearly twice the required voltage, which will blow them out. If you use two AA batteries in series, you will have a 3-volt tester, and you can check each 3.2 volt LED at a time, without fear of blowing the LED.
The BEST method of testing LEDs is with the variable voltage LED tester that is sold EVERYWHERE. Made in China, and you can find them from about $20 to $60. I got mine from Amazon for $23 including tax. It will check a single LED or an entire string of up to 100. It varies the voltage as required.
Thanks for this. Tip worked well. We actually had two led out on one strip.
Well done.
Thanks u you've teach me something today i wanted to knw along time now.
Great trick, my first strip is completely burned out, and the rest are connected in series behind it, so no backlight. I think I must have the 6v lights in my LG, I needed ~50v to get them to light.
Fantastic video. I have a very similar LG that I will be opening up next weekend. Tried a repair on a Samsung glass screened LCD some time ago but made me sick how stubborn the holdings of Samsung were. LG seems easier to strip down to expose the LEDs. I will be trying your battery trick for sure.
Did it work for you?
@@j.lietka9406 yes, worked perfectly. Total cost of repair (batteries, replacement LEDs) $15
@@RogueLegend999 very good!! Thank you for your reply! 🤓
Good idea. I used an 18v cordless drill battery on my 55 inch Hitachi 10 LED strip (they come apart into 2 strips, I tested half a strip, 5, at a time) and it worked great. I found out I have 2 left side strips that are out. Found some on eBay for $12 each. Not spending $70 on replacing every LED. This video saved me a lot of money, and/or saved my TV from the landfill.
thanks a lot for the info. yes you could have wasted more money, but good thing you had the knowledge to fix it. Thanks for watching!
Would there be no worry here that the 18v might fry some of the working strips since they require 15v or is the 3v fairly negligible there? I'm having the same problem and only have an 18v cordless drill battery to hand.
Adam Lane i wouldn't go no more than 3.5 volts for each LED.. and only test really fast dont leave the battery touching very long. now some leds may actually be able to run 6v each.. but by then, you will see that it will be dim when you test it out.
@@TECHIELIFE Do You Think I could use a 20 Volt drill battery to test My LEDs right where the LEDs plug into the power board, to see if my LED's/back-light are working? After unplugging the board of course. How Many Mh do you think the Drill battery is? I don't have any resistors to add in the circuit.
@@mrbreezeet1 at 20v..i woulddnt go any less than 7 leds anything below that could damage it. typically a full charged battery cand range a bit over 20V so if you get 21V divide by 3V needed for each led, it gives you 7. you can do 8 and more, but it will get dimmer.
Superb idea .thankyou has helped loads.
Thanks man! Had my Hisense go out and found a blown strip. DONE. Wanted to test them all instead of just that one to be safe.
Thanks for watching. I'm glad it helped out.
@@TECHIELIFE did it last night. Worked perfectly!
well done. now just replace and should be back up. just remember to lower the brightness a bit this time.. Thanks for watching and please subscribe.
Thank you so much for this. It worked for me. The middle led strip in my Samsung tv isn't lighting up. This has saved me so much money because now I don't have to buy a new tv 😁.
Good luck on fixing it. Please subscribe!
Hi I have question what is the voltage in your board coz mind only 79.5 volt so its ment my led are dead hehehe thanks waiting for your response
Excellent work bro
Excellent video!
thanks
Awesome thank you 👍
I told you that you was a genius!! The battery method worked!! You da man!!
khumello glad to see you got it.
Very informative broham thankx for the tech knowledge...wanna fix my girlfriend's lg 50 inch got it stripped down to the backlights but couldn't figure out how to test for the bad led but now .....good head is coming my way....lmao..stay blessed man
The things we do to keep a good head between the legs and pelvis 👌👌
Thks for the tip with using the batteries worked a treat 👌
if the orignal LED is 3v is buying a replacement 6v ideal, so that the LED wont reach the max power and burn out, its just a question
No, you want another 3v.. if you purchase a 6v, the other leds will become very dimmer and that one led will be brighter.
Nice video, thanks for the heads up
Quick easy question? I got two brand new power supplies and led output for the backlight is 130v roughly on led pair 1 and 0vokts on led pair two off these boards. Am I correct in assuming these parts I bought are bad? It mentions 89v on #4 on the voltage tag on the board. So I my mind these are defective. It does it without led connected and without motherboard connected and I have tryed with it hooked up...
You know your stuff. Very nice. Thanks for sharing your knowledge.
Great tip. Made my night. Thx!
lol.. never heard that before but thanks!
Nice
This was VERY helpful! Thank you!
Thank you for all the help and time..
To save some frustration, start at 2:33
Great tip and info 👍
Thanks man I like that little trick with the batteries
Fucken MacGyver! You are a genius. I have s Toshiba 40L310U doing the same thing. I'll check it out.
Thank You
Can I use the three battery set up to test it right where the LEDs plug into the power board, to see if my LED's/back-light are working? After unplugging the board of course. How Many Mh do you think that is? I just don't want to Fry my LED's if they are good. I take it a 20 volt Drill battery is too many Mh's correct?
LED's simply don't last forever and if you have them dying then it's time to change them all. You can buy complete sets of LEDs from China to suit the TV you're working on. It took me some time tracking them down on AliBaba, but I ended up finding the set I needed. Total cost with shipping was around $46 USD.
My TV should now last another 3 years, maybe more. But messing around and only replacing a few means you could be replacing the old LEDs every few weeks or months, I guess it all depends on how you value your time. If you decide to replace only the blown LEDs then also check for any LEDs which appear to be stressed and change them even if they're still working. If they look stressed, they're about to die, so remove them. Also, replacing LEDs with those out of wrecked sets isn't a good idea either.
Propfella, I understand that they don't last that long. And yes I agree to switch off all the LEDs is a better idea. But sometimes is about the convenience that matters. I would buy broken sets and repair them as seeing fit and reselling. Spending more time and money on the tv would cause the profit to go down. Granted, I don't sell these TV's at full price either, I would tell my customer that it's a used tv and I also would give them a month warranty. The biggest thing about LEDs is the heat. Kind of like you car engine. It would last a very long time running fine, but it you just have one instance of it overheating, it could cause damages all over. That's what LEDs are more like , and yes I know that LEDs will eventually give out. But the problem is the heat management. This is why I always advise to lower the brightness down a notch .
You did say that you purchased some LEDs for cheap, some cases buying these Chinese LEDs don't always work out fine. Quality control is not that great. So I prefer an oem strip instead of aftermarket.
@@TECHIELIFE Considering the fact the LEDs came from the company who made my TV, I can only assume they'd last as long as the batch which originally came with the TV.
As for taking LEDs from other sets I also assume you're the type of "tech" who tells the customer their TV is unrepairable, tells them they have to pay to get their dead set back and when they don't pick it up you throw in some used LEDs and sell it to make 100% profit.
Yes we have the same type "tech" scammer who does the same thing in our town. "Can't be repaired, it'll cost too much" he says and an hour later he's repaired it and selling it to some poor sucker who'll be lucky to get a few months use out of it and you'll do exactly the same thing to him. "Can't be repaired, but here's one I repaired earlier"
@@propfella I don't do repairs for any one. I simply purchase broken TV's that people sell and show others how to fix their tv. I do have plenty of videos showing this.
@@TECHIELIFE So in other words you sell "Fixed" TVs knowing the remaining LEDs could fail at any time? I wonder why I assume there's a healthy profit between the buying and selling price? I was in the TV / Video repair business for a number of years and thankfully I never once sold anything I knew would fail in the not too distant future.
Plus the money you make from TH-cam of course.
@@propfella yeah your right . I'm just a scammer.. so go ahead and move on to the next TH-cam channel to stir up nonsense. Have a good day.
Hi i have a 48 tv and i want to test the led. My tv has 11 led at the row how many battery i need? Thanks
Thank you you rock!! I wasted 2 days on this T.V ! So thanks alot !
very informative video. Thanks!!!
thanks for watching!
It definitely helped. Thanks
I want to buy a led back light tester but there isn't a UK version with a UK outlet... I gotta try this
Your Idea has work out.Thank you brother. God bless you.
Amazing video very impressive just had a quick question so if I do this I can touch and test any of the LEDs one at a time? Anywhere on the board except for the middle connectors? Because the middle connectors will send voltage to the entire strip? But if you touch one 3 volt with the 27 volt wouldnt that blow the single led as well? I want to try this on mine ASAP because I'm waiting for LEDs to come in the mail so if you could find the time to get back to me that would be great thank you
Yeah , do not try on a single led. It will damage the led.
Hey man, this video really helped me to better understand what should I do, but can you help me which one should I buy for my LG 32LA620S-ZA ? 3 or 6 volts?
Hmm. I'm not sure.. depends if it lights up with 3 volts. Amd if it comes on full brightness. If it doesn't, then it probably a 6 volt. I will be doing a video later on today on how to test it.
Very cool. Thanks for the vid!
Just wanted to say thank you for this video. It verified my theory for testing the LEDs in my LG 55LB5900-UV.
Mike Oleksa sure thing
So you're saying if there's one bad light that if it's removed the tv will function? I was thinking I had to replace it. I know my 65 inch insignia has a backlight problem but I haven't disassembled it yet. Was thinking I needed a lot of stuff to solder, heat, whatever flux is, etc.
If you don't already have all that stuff it would be cheaper just to order a new led strip kit
@@MyBigThing2010 yeah I fixed my TV last yr or maybe the yr before. Lots of people give those TV's away and the repair isn't that bad. I even had a shop tell me it wasn't worth repairing which tells me how sorry some "specialists" are.
When you applied the 3 x 9V tester, did the rest of the LEDs on that strip also light up? Thank you 🤓
Well it depends on the tv. If the LEDs are in connected to the rest of the LEDs, then it should turn then on.
I've got to replace the LED backlights on my 5yr old 65" Philip's PFH5250/96 as the LEDs have gone dim on 1 side :) not looking forward to this to be honest. Nobody seems to have taken this model apart on YT :(
Just try to figure out which led has gone bad... Or just try to replace the whole led strip. That would be easier
Fantastic, can in ask, i have only 8 led in my strips, is 27v to much? Would using less like 12v still light them up but more faint? As in enough to know which led is not working?
I would only use about 20v
@@TECHIELIFE Would 18v work as in 2 of those 9v batts or would 18 not be enough to light them?
thanks for sharing, really saved me $$$$.
Glad to hear that!
Thanks,, just the info that i needed... Groetjes uit Holland..
Thanks for the comment!
Hi, let me know total led how many ohms between B+ to ground....? please give your feedback...thank you
Great video and I wanted to ask what kind of wire I need like could I use wire from a USB cable
(I'm new to this so wanted to make sure)
look at my recent video clips . I used a usb cable there.
Thanks for a very informative video.
Very informative, thanks!
Ok I have a Vizio model E470i-A0. Looks to be the same one you're working on. The led connection port has 4 test points the they are as followed. Led1-, Led1+, Led2- and Led2+. At each positive Led1+ and 2+ I am only getting a voltage of exactly 68v does that mean the power supply board needs replaced? I did the flashlight test there is an image and sound but no backlight. I dont want to go any further by testing each strip yet. Please let me know as soon as possible thank you.
Tnk, for the help, just one question, my led strips are made with 14 leds, could work with 9x3 battery or I need to increase the number of the batteries? Tv Samsung ue55ju6800. Tnk in advance.
Let's just say, under voltage is safer than over voltage.. these leds will be damaged if you go over
Great Stuff👍.
so i have samsung un60j6200af and it has two seperate led wires one set grey/black and anouther grey/black when i use the 9v battery test it lit one of them but other set of wires nothing happen.. so im hoping even though its a job its just the leds.. shopjimmy has kit with suction cups for 12strips 100$
could I possibly use a buck converter? I have 8 led per row and a hp printer power (internal )supply is 29.v Ive ran my sound bar and other thing off it. there $3.00 e-bay.. thanks
I don’t have 3 batteries I’d there any other options ?
are you always online? can i use per piece universal led strip on my samsung tv with my stock led driver? i order it online.. it is 3v. it is 1 bulb that can be soldered in series.. can i use this?? i've already ordered it online.. i hope your online..
Do you have the link for it and the model for your tv
can you add me through messenger? my name is Jeff Pallarca Gimeno. i am really grateful if you let me help me on my tv.. i will send the picture and link..
Thanks a lot!!
very good video, thanks.
If I wish to replace individual LED in any of the strip, what is the type of LED I should buy from the market? 5050 or 3528 or what? Can you pls advise? Three battery pack for testing strips is really interesting. Thank you.
You honestly should measure the LED, or just try to find an identical one on eBay
40L310U Toshiba LED i just picked up lights up for about 30 seconds until it gives out. When I flash the light I still get picture just fine. Would I even need to pull it apart if all the LEDS seem to work - if only temporarily?
What is the meaning of one strip says R1 and follows the other strip that says L1. What is the deal with that. Can one unhook say the L1 and light up the R1 or just cut off some of them ( being hooked up in series, probably not) to shorter the strip just for the purpose of sticking them somewhere and use them for fun? Dang I didn't realize that you have supply them with so much voltage.
thank you, good to know
nice
Good job.. thanks for sharing New subscriber here Shout out
Thanks.
My sony 55 is super dim. I'm guessing it needs some replaced. Will this process work for the sony
Depends on the model, but yes it should
Receptionist at an authorized LG tv and appliance repair shop in Ohio said the whole panel on the TV needs replaced if some of the leds are out. And it costs $500-$1,000. Is this true? Lol. I though you can just replace a strip of the leds.
It's true that it could cost that much. But it's something that you may be able to do yourself if you are very careful. This is a kind of hard task to do. But the principle is easy. They Normally will replace the whole panel because this way it's an easier and faster job to do and will pass the bill to the consumer.
Thanks for sharing this video, I replaced the led bulb and all the leds were working, when i put the led strip back, As soon i connected the led connector same led bulb blow again. Do u think something wrong with power supply? Can u kindly help me with this. Thank u.
checl to see if there is a short there... but most likeley its the led.. leds dont blow unless its over driven.. try lowering your brightness.
Thanks for the tip
How do you know which LEDs to get for your TV? I can't find the strips for my TV anywhere so I was planning on replacing the individual LEDs but I have no idea how to find the correct voltage or color for my TV. Are they all 3v LEDs?
th-cam.com/video/YgaL6X6eSaU/w-d-xo.htmlm40s
That video just shows how you can get the strips and how you can test them for broken LEDs. It doesn't dive into how to test what an individual LED uses for power, what type of LED it is, or how to determine the correct color LED to get. I have an Element TV (ELEFT502). If you guys can help me out that'd be great!
New subscriber. Nice work. Can you help me with my Polaroid tv? Model tlx 042-40b. Have standby and power lights,no picture. Inverters look good,think it's a blown cap on power supply.
Do you have voktage coming out of the power supply to the LEDs?
@@TECHIELIFE That's what I'm not sure of...where to put probes on my meter to check...should it be 5v coming out or 24v?
@@Buff_Dave_Oprtr probably the 24.
Just been stripping ours down if goes well will e my third tv repair success plus 1 that's an almost fix (sound plus tv comes on (didnt before ) but still no pic ) first fix was a 37inch samsung lcd and being used as I type lol which only needed capacitors (£5) anyway almost to the nitty gritty of getting to lcd's (these ove not yet ever done ) I have a supplier who has them but there are 2 arrays so need to check which ones are needed it's a Phillip's 49put4900 model there was a an upper and lower dark patch that was only noticable on certain dark screen picture I have no lcd tester have u a link for your tester ? Are the cheap £10 ones on ebay any good ? And did u test the side ones that you mentioned? Thanks good video
I have a link on the description of the video
@@TECHIELIFE my bad I'll take a look mate thanks
jus had my trusty samsung go dark on me, did flashlight test got sound, could see picture with light. and i know i have voltage going to back lights but i havent pulled the screens off. but I know its possible to to at least do some testing now thanks for the tips!
Andrew Stewart at this point, plan on taking it apart. Now all you need to know it which LEDs went out. What is the model number?
Its a samsung UN46ES6100FXZA, turns out its the left and right style, about 60 lights per side. Looks like 1 strand is 120 currently on ebay. May be worth upgrading if i need both sides.
Just be careful that those wires don't get together or you will have some red hot batteries, there has been more than one 9 volt battery that has started a house fire in a junk drawer. I, myself got a hot one quick when a battery got against a quarter in my pocket. I'd sure find a way to keep them separated when you are not using the batteries to check the LED's
I have a case for storing my 9 volt batteries. If you don't, just use electric tape to cover over the contacts before sticking them in your drawer.
Better yet. Use 1 9v battery. Scrape down to the copper trace on both sides of each LED for POS and NEG. Tap POS to POS side and NEG to NEG side. Light if good or no light if no good. If you're worried about a 9v lighting a single LED then add a 100 resistor to either the pos or neg but I've never had an issue lighting it up for less than 1 second.
Michael W good tip.. but I don't trust LEDs to be overdriven. Anything above 3 v will try them.(individually)
i just used three 9vs in series and tested the whole strip in one connection just fine, many times over, just with reversed polarity. I also used the 27v series, pos to pos and neg to neg to test the individual leds, because this was my first time doing literally anything with electricity, and they are still fine
So I could use a little "wall bug" switching power supply of around 30VDC to do this, right? Or, would the voltage be too un-filtered/un-smoothed?
I don't think it needs to be filtered. The lights will get brighter as more voltage is introduced.
@@TECHIELIFE Cool. I managed to test my LED strips using a transformer from a toy railroad set.
my master samsung ue40h 6270 led 5 row led bar 4 row led bar if it works fifth or not, we can get the image.
Thank you!😊
Just bought a sound no picture 50LN5100, figured replacing a few caps be no problem. Came home and realize on LED TV its more likely the LEDs go out then the PSU. I watched a whole bunch of these videos and I have 2 questions. Why not use LED Strip you can buy on ebay, the 16 foot 300 or 600? they use the same 3528 LED. So second question arises How much voltage is actually coming from the PSU in that pair of voltages? Thank you
Christopher Parker you kind of answered your one question. But to Clarify, the LEDs sold on eBay are wired in parallel circuit. Meanwhile, most led TV's will be wired in series. Which is why the whole strip goes out and not just one (in some cases)
Hi.....how did u bead or solder the strip where there is missing LED. I live in small town where no TV parts are sold and my TV display went black today only sound. Luckily i have an old tube TV to go on with my life lol. Gona be a while before i can get a replacement strip
Place a small piece of copper. And it should bridge it
@@TECHIELIFE thanks will try that today
AWSOME VIDEO , THANX ON THE TIPS BRO 👍
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@ TECHIE LIFE A Couple Volts, Yes, When I read 18.5 It had First went up to 22 or 21.5 then leveled out to 18.5
i would say that even at that voltage, the tv should have backlights lit. what about when you unplug the leds from the board. and try the same test. what is your result?
@@TECHIELIFE I don't have it down that far
@@TECHIELIFE you Say you have a set for the same TV?
How many strips is in the E32h-C1?
How much for the used full set shipped to Bridgeport Ohio, 43912 ?
OH I mis Understood, Same Voltage, But I can Only get voltage using The Chassis Ground.But there is continuity to ground (chassis Ground ) from the - pins at the board.
@@mrbreezeet1 sorry, but i looked at my stock, i dont see the strips. I would advise to utilize ebay and search by your model number.