The BEST Way To Learn Electronics Repair
ฝัง
- เผยแพร่เมื่อ 11 เม.ย. 2023
- LER #417 So what is the best way to learn how to repair electronics? Is it by watching videos on TH-cam? Hmmm...
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Thank you
Richard
Richard is right. The BEST way to learn electronics repair ( aside from watching this channel of course!) is to actually have a go at it.
You might not fix things to start with, but then you will, and your confidence and experience will grow.
I normally wait till I've finished watching before pressing like, but taking that sticker off was more than enough for a like :)
There's zero chance that was a genuine Apple product. Someone just slapped that sticker onto that nasty amp.
@@1pcfred Thanks for clearing that up Sherlock.
@@badgerfool1980 You're welcome.
same here bro..i smashed my screen protector hitting the like buton when he did it
I’m trying to understand electronics just for fun in my spare time because it interests me and this stuff is so incredible someone with you’re skill sharing this. Way over my head at the moment but thank you
Not an electronics engineer myself, but very interested and hands on. And to be honest that explanation of the bridge amplifier was just excellent! Super content!!!
If you wondered what I was saying at 01:15 where the audio skipped, it was 'if you don't have the tools to fix it, or you work out what is wrong with it but then it is not feasible to change the parts you still learned something'
This is awesome! Observing how a professional works is priceless. I learned so much in the first 45 minutes than any other course I've looked at.
As allways perfect! Thanks and please more.
This was lovely to watch.
I'm trying to learn electronic repair to fix stuff around the house, as a hobby, and this channel has been a great resource!
Good see ya back in video. Awesome. Ty
This was a brilliant watch. Thanks for taking the time, you're a great teacher.
1:07:25 TIE fighter incoming, brace for impact :)
I see once again the thermal camera helped. This is a must have tool IMO (I still need to get a hold of one).
Another great repair, thank you!
Another good use for just a cheap infrared temperature gun, is battery banks. Like used for solar/wind electricity storage. You point it at each terminal post and where you get a higher reading tells you you've got resistance and you need to clean the terminal/battery post. Sometimes its the interconnect jumper cable terminals. Its a quick way of checking the battery connections. To further pin point the problem you can put your meter on DCV and one meter probe on the actual lead battery post and the other probe on the terminal itself. You should have 0 volts. If there's a difference of potential, (a voltage reading) then you've got resistance and need to clean the connection.
I love these presentations, completely absorbing. Happy New Year!
Very helpful!, Thank you for taking the time and effort to record this for us.
awesome video Richard :) cool fault finding and sort of repair :)
Great learning tool. Well done
My guess as to why it's easier to strip with the flush cutters facing backwards: If you look at how the blades are shaped, you'll see that they're flush on the back (hence the name) and tapered on the front. If you use the cutters "forwards" then due to the angle of the blades, a part of the force will be directed downwards into the wire, essentially pushing the isolation under the blade, causing it to slip. If you use them "backwards", the blades will be perpendicular to the wire and all of the force will be directed towards stripping the isolation from the wire.
I told Rich before, it's the "lobster pot" effect! 😅
@@grahambambrook313 Yeah I know someone told me before I just didn't quite remember the physics 🙂
Best video for a while
Nice to see you work on things other than power supplies and computers
I'm seriously considering emigrating to the Canary Islands, the warm climate is most inviting!
Great work I had forgotten how a bridge worked now I haven't ! very educational, it was odd at first why one side of the bench supply drew no current........cheers
Wouldn't be surprised if the glue was also a problem. It can become conductive, and if it was part of the issue, removing components would break/crack the glue removing the conductive path. Watch out for the yellow (Ados?) glue on PCB's. It's the worst. Easy to check that with an ohm meter before disturbing components. 50yrs in the trade, and now as a hobby, it's fun to get something from earlier times dropped off for repair.
Great videos. Thanks for taking the time to bring them to us 👍
Cheers
Pete' New Zealand.
Thank you for these videos
This was a fun one and thank you for bringing us along!!- New subscriber
Be sure to check the supplied plug adapter for ground continuity if you buy the linked desoldering gun. Mine was not connected. the Chinese power cord that came with it was absolutely fine and so was the ground continuity from the tip of the gun to the socket on the device. It's easy to restore the full ground continuity. Just swap out the Chinese power cord for one suitable for your own region. If I'm not mistaken the thing is multi-voltage, but it is only marked like that on the power supply inside, not on the outer shell, so please check that first.
Proper mate. Thankyou
To stop shrink tube shrink during soldering a short wire, slip a bare solid #14 awg “ish” wire under the shrink tubing, along the short wire. After soldering, pull the bare wire out. There should still be enough clearance to slip the shrink tube over the solder joint.
very informative and interesting. Thank you regards mark, UK
Epic video…thanks for giving up so much time . (It looked like one of my repair jobs rather than one of yours )
Excellent vids, thanks 😊
thank you sir!
I learned electronics with a Philips Electronic experimental kit (late 1970s) which led me to my first professional education 1984 as Radio & TV service technician in the 4-man workshop of a local electronic distributor which delivered small electrician shops with electronic components & kits, devices, antennas and installation material, also some special jobs were done (manufactored speaker boxes, PCBs for lab power supply, alarm & video monitor system).
After that I studied electrical engineering specialized on technical informatics comparable with computer engineering (1990), working on measurement acquisition (and control) software development, later software build- & test-systems (QA).
Hey sir, Can I contact you. I am sri lankan. I am doing my advance level exam in november 2024 in maths stream. My only ambition is to become a best electrical enginner one day. I need practical knowledge. Our country education hasn't any practical lessons. There only theory of electricity and electronics. I like to learn all over things about electronics and electrical. I am making some electronics projects,RGB led light decorations,alarm circuit so many things. The nice thing is am A girl. And age 18. Can you help me to learn these subjects. 😢
enjoyed the video, At 42:20 I did see a lot of glue around the amplifier chip. Sometimes this glue can become conductive over time and cause all kinds of strange problems.
Great vid again rich thanks,I've been watching " mend it Mark" he's nearly all audio he's a Wolverhampton lad thanks again .ktf
Hi Richard. I’ve recently decided to try and begin repairing faulty flat screen tv’s and would love to see you take some of these on so I can see how you go about it to give me some solid pointers of jobs I pick up of my own. Many thanks for all your videos!
I can fix them, and have done so but I have a problem with that now because as a term of the lease on my workshop I am not allowed to repair TVs there
@Gareth Edwards , This TH-camr, BigDog8882 demonstrates Flatscreen TV repairs. In fact, I repaired an LG TV using his instructions. He shows various makes and models of TV. He also has a course on SMPS repair, which I found invaluable.
Not only a great video, great music.
KTF 😄
Good work
Thank you 🙂
I thought you'd have used your "Clone huntron tracker "on it, which by the way is very useful here, saved me time on amp restorations,
Nice desolderer! Wow!
I did just that. I started with tape decks, speakers, and then moved on to mid tier amplifiers. Then higher end vintage amplifiers. I have so many working pieces now I don't have room.
I am working on tape decks right now. Any good resources you’d recommend
@@connormcnamara9881 Audiokarma and Tapeheads websites.
Thank you for that
Nice adventure!
❤I like this video.
Hi Richard - my bet is that it was that glue under those capacitors that caused the problem. Nice video! Regards from Montreal.
At 35:00 I think you got yourself a “Deacky” AMP LOL! Now go ahead and call Brian May, he might be interested in getting one! Thank you for the video, very interesting repair Richard.
thank you.
I’ve got a cheap soldering iron that I leave set up in a little vise on my bench that I use when tinning and joining wires. Leaves both hands free for wrestling the wires.
than you , berry good video .I Wish sontime you talk about L3886.
Richard, it is much easier to strip the wire with the flat bottom of the cutters because the top edge has a rather steep bevel, which acts like a wedge working against you in all ways. The wedge shape forces the blades apart (as you push on the insulation) causing the need for more pressure applied, which only compounds the fact that the wedge shape will naturally squeeze the insulation against the wire.
The flat side of the cutters mates up to the flat end of the cut in the insulation where the only direction of force is pushing the insulation off.
You know what works even better for stripping wire insulation?
A pair of wire strippers! 🤪
🤣😂
@@ElectricBillAlbright Yup, I use self-adjusting wire strippers. Quick and easy and never cuts in the strands, even on tiny wires.
good content
NORTHERN SOUL of course!!!!! 🕺💃✊✊👏
Heya love to see how and amplifier works ( would love it more wen you would go deeper in to the materie, back words eneniering to learn more details ). only 1 video to go end I have seen all your video's.
Very super 🎉
I notice you use Ohms a lot for testing, and you did it here testing your cable repair. I've always used the 'continuity' function for fault finding/repair checking. I've never really learned how to use Ohms as a testing measure... Maybe someday you can do a video on it as opposed to using 'continuity' and how and why Ohms is a main go-to method for you? Cheers Richard, from Rick in Australia.
It does matter in some situations - I'll think about your suggestion, thanks
@@LearnElectronicsRepair Onya Richard! Cheers!
I agree
Keep the faith
Very very educational never regretted subscribing. The only thing though is where is the speaker grounded in the bridge circuit?
can u made more video on diode mode , curve trace & injection voltage , tq
When I saw that amplifier is doing the sound like an oscilation when you increased volume I said to myself that time that there should be a capacitor fault because started oscilation when volume was increasing. If was the chip, I think most of the time would oscilate continuously till would explode without modify volume (opinion of a beginner in electronics).
And you were correct, you are clearly learning well 🙂
There still seemed to be some strange noises even after you fixed it, but I think you called that Northern Soul.😮
PMSL! 😂
лучший способ изучить ремонт электроники
1. чтобы не выпускать из трупа дополнительный волшебный дым, надо сразу включать от защищенного блока питания.
2. сразу скачать техническую документацию на все микросхемы
3. перерисовать принципиальную схему с печатной платы, это вырабатывает навык видеть функциональные блоки прямо на плате и понимать схемотехнику.
4. Электролитические конденсаторы в сигнальных цепях это то что сразу надо менять на новые, особенно если устройству лет 5-10, и оно еще дополнительно пару лет провалялось выключенным. Выпаивать и измерять смысла нет, при пайке они нагреваются и при измерении они обманут. Стоят они копейки, менять сразу, соблюдая емкость, и желательно хоть немного сформировать, чтобы избежать больших утечек.
Fantastic channel , just getting into this would love to repair old 70s/80s music studio samplers / synths etc
I currently have a Yamaha e1010 1978 delay unit and the audio coming in on the input is spiking when you turn the unit on and then all audio is gone. Turn it off and back on and repeat
Any ideas ?
From 42:00 onwards in the video. The capacitors of the amplifier can be easily tested without removing them from the circuit board. I mean the method where the tip of the soldering iron is used to heat the capacitor casing. If the sound improves/changes, you have found the bad one.
(this method only works for electrolytic capacitors)
De- apple ...brilliant
Good detective, repair work, eventually, ho, ho. More raspberry than apple especially with the sound effects and rear-facing woofer with what looks to be virtually no open air paths to the front slot baffle. Broken wire spotted at 47:34. I unplugged the speaker and the sound stopped, know what you meant but made me laugh, as did red, black, brown 2k 1:11.37.
Oh yeah that would be 200R
Likely a bad question.....in situations like this, would it have been possible to pass a constant signal through the system and use a scope to check it at various points? Could the bad caps / circuit be identified that way?? Appreciate any input. Thank you.
I love your desoldering gun! Where can I find one?
Let me know when you make the small signal generator for sale
can recommend a decent rework soldering station for a beginner that is definitely going to stay with it for awhile??
What is that piece of equipment in the back on the left?
De-Apple. Brilliant
I have a power supply of 12v 20a it can't turn on after I checked there are short circuit components, what should be checked?
Tried fixing a dead UPS for 3 days, Ive given up after checking so many things ie battery mosfets, caps etc, but I haven't removed a single component to test out of circuit. is this the wrong way of doing things. (still learning)
nice - 10,000 more videos like this and I might get somewhere
Nahh... do it the easier way. Just go buy some cheap worthless broken stuff and start trying to fix it.😀
What is memory in electronics? How is it possible for it to retain pictures, sounds, numbers? Do u have a video on it.
Hi I was given a Dr dre monster beatsbox 2010 edition and for sum reason it won't power on when I plug it into the wall.. Any advice greatly appreciated.. Mike
I would have liked to see the bad capacitors tested on the ESR meter...
Yea, I was thinking the same thing. The caps might read close to there capacitance, but there ESR can be way off.
25:29 - It looks like there may be four screws in the corners hidden behind some goo covering the access holes.
Just curious, why does it need the 2 Rails; B+ and the Hot Ground if it is only using one of them? Your PS didn't show any current draw on the left side at all?
Seems to me the amplifier chip is oscillating at a high frequency. That would explain the strange sounds and the burnt up resistor (-s, probably in the zobel network)
The burnt up resistors (one on the PSU board the other on the volume control board) only supply zener diodes which provide lower regulated voltage rails purely to supply current to the LED indicators as far as I can see.
What was the desoldering gun model please. I couldn't see a link to it
Can you help me to get some experience in electronic repair
I'm surprised only one rail was used.. wonder if something else is not wrong. Anyway, great to see you keeping even the simplest of hardware alive, hope you will enjoy using it at your bench!
It's working fine now -so it must be single supply, also I think the datasheet for the bass amp chip said it was single supply rail actually though I didn't pick up on that at the time. The stuff I was talking about on bridged amplifiers still applies to single supply rails.
Those PC speaker systems are often so full of hot glue, silicone paste and mounting glue they become very hard to work on. It will be interesting to see if this fixes the problem or if the stressed caps were a result of an underlying issue. Those two cooked resistors are shocking design flaws.
Yeah the cooked resistors were horrible. As mentioned they only exist to feed zener diodes that then feed a stable voltage to the power indicator LEDs (one front one rear) through a current limiting resistor. Worse thing that would happen if they fail, apart from the thing catching on fire, is one or both of the power LEDs would not work.
In switching power supplies they use those blue colored flame proof resistors as a protective fuse. They're usually a low ohm value like 2 ohms. The trouble is when you got something with a resistor that is now literally a piece of carbon! 😅 No schematic, how do you determine the value for a replacement. If you're good at reverse engineering or engineering period may be you could figure it out. 😉 Then again, if you had that kind of knowledge, you'd probably throw it away and get a new one! Lol 🤣 😆
On your capacitance meter, are the little holes that say, cx+ and cx- used to just stick the capacitor legs in and test; or are they for something else?
Secondary question. Is the ESR reading on a component theater any use, compared to the dedicated device. I'm guessing not, it would like to see how close it is
@@theshemullet No not the same at all - a dedicated ESR tester can do all sort of things such as measure inductors and find short circuit Mosfets in VRMS. The ones in a component tester can not.
th-cam.com/video/bMUzTGnvrbU/w-d-xo.html
I never used them LOL but I guess they are for sticking capacitor legs in
a couple of heavily distorted Wigan dancers!!!
Brill advice about buying cheap test equipment to get started..
Is it that hard to keep anything still?!! Grr!
I have a faulty brand new beats pill and when you play music you get a periodic static crack/static noise. Anyone know where to start in fault finding?
I am a. MAzed to find this video so early in it's life.
Omg he just stripped wire the same as I do! 👍😎
Anyway I am a novice and have taken up exactly what is suggested. And Im trying to use the methods and approaches suggested by our host.
Good luck me!
You are on the right track - keep going and you will succeed for sure 😉
I guess I ought to buy a broken amp and see if I can fix it.
Why didn't you test the caps with an ESR meter?
at 34:06 How did he connect those long joints did he just used a regular wire
My dear Richard ... a note because it seems like YT is mental when it comes to audio or video copyright, many channels have had their videos removed because they passed music from a radio station ... sad to say but that has been the case for this platform.
Which is one reason why I use obscure rare records from the 1960s that have hardly been anywhere near a commercial radio station, and I also play the audio directly from, guess what, a TH-cam channel video - so the audio is coming from TH-cam itself. Common sense says that is not a problem, otherwise TH-cam would not allow me to watch the original video I am playing in the background in the first place th-cam.com/video/A-c_veZrmiE/w-d-xo.html
The other better reason is because I love northern soul and have since the 70s
@@LearnElectronicsRepair That's the way to go! I truly do not understand why they pick on YT creators because I think in the USA it is Fair use to pass up to some minutes of copyrighted material (audio or video) Specially on Educational video like you make ... but in case be aware of that problem ... :) they are watching you :)
@@LearnElectronicsRepair Wow! Ten Miles High - not heard that for 50 years. Must dig out the old singles..
Lol. At 1:14:07 there was a (in pitch) rising oscillator sound in the music itself🤯. I really thought it was still unstable. Would have been a huge Murphy for me! 😵💫
Yeah that is kinda because the song is called 10 miles high 😉
@@LearnElectronicsRepair Ah, that club! 🤣🤣🤣
I would like to repair a set of cables for a car battery jump starter (lithium). My daughter connected the crocodile clamps the wrong way round on her car and although they are supposed to be protected with a light for reverse connection they dont work anymore. There are only few components including 3 small capacitors , 1 chip and and a large black cube which resembles a relay that you would get in a car fuse box. (However its not a pull out like in a car). Anybody have any advice or direct me to a tutorial please? Shame I cant upload photos.
my advice: take apart everything you can until you can put it back together and recognize problems
Best way I learned was to be thrown to the wolves as it were, first day out of school and on the job many years ago...repair the electronic gear or else get replaced with someone else who could. Learned real quick.
I used to enjoy repairing electronics stuff but nowadays electronics stuff got cheaper than the time I spent to troubleshoot it so I just threw them away and buy new ones
if that pot is just for the volume why would it need to have 6 pins on it ?
Stereo ?
@@andymouse Yeah
that noise sounds like a ground issue
Love your videos. I learn a lot from them, and maybe it's me, but in this video you're not showing so well, what you're talking about. Example at 28:00, when you discover the burnt resistor and Zener diode, you're moving the board around so quickly, it's hard to see what you're talking about. I'm not trying to troll you, just constructive criticism.
And that is always welcome 🙂
@@LearnElectronicsRepair I forgot to add "And thank you for making the videos!!"