The 12 Most Common Electronics Faults : How To Diagnose And Fix Them

[@davesdigitaldomain]

I agree with you on the electrolytic capacitors, unfortunately most manufactures today still use cheap poor quality capacitors and that is why they are the most common failure. if they made them like they did in the 70s and 80s like for instance Sprague and Mallory capacitors they would last for decades I still have some vintage equipment that I use regularly like my old Tektronix 465b that has these old capacitors and they still test fine today 40 years later.

[@psmith6388]

I've had 3 or 4 Behringer UMC202, 204 and 404 soundcards all coming back to the warehouse faulty. All of them have various blown capacitors. Anyone else seen this? Great video, thanks!!

[@darrenbird2526]

Hi Rich! Thanks for spoiling us again with GREAT content! Look at the amount of views and likes you get in such little time. It's because you give such great advice. You take your time to explain things to us in detail and in ways we all can watch over again so we can understand. No matter how much experience we have or don't have and in a way we can understand. You know when there's a possibility that some of the things you try and teach us some of us may not understand and then you take the time to get out your pen and paper and give us explanations and possibly something that the majority of us can understand. I'm not pissing in your pocket mate but this is one of, if not the best channel to learn electronics and I sincerely mean that from the heart and I thank you for teaching me about something I'm passionate about. Some other KZbinrs need to watch your videos and learn from your generous techniques. Especially when they charge a lot of monthly donations to learn less than what you reach us for free. I for one am very proud to give you a monthly donation. It's a pity more people didn't do something similar or at least buy you a cup of coffee for what you teach us, as you are a rare one that doesn't beg for likes or even subscriptions so you can fill your pockets with KZbin money. I for one thank you from the bottom of my heart for teaching me about something I'm so interested in. Thank you Rich!

[@sharymens8187]

Yes! He is amazing!

[@LearnElectronicsRepair]

Thank you, that made me blush. If anyone really would like to help me earn a bit more but for no cost to themselves, when ordering anything from AliExpress look at the URL and delete everything after the question mark, replacing it with af=ler2022 So for example a mosfet kit like this one www.aliexpress.com/item/1005007134551393.html?spm=a2g0o.productlist.main.7.24fd60a9MxTi73&algo_pvid=d0e49806-4b77-403a-8f83-ea36de587680&aem_p4p_detail=2024120510374417838518589759570004673280&algo_exp_id=d0e49806-4b77-403a-8f83-ea36de587680-3&pdp_npi=4%40dis%21EUR%215.31%215.31%21%21%2139.69%2139.69%21%402103890917334238649242381ead87%2112000039536095740%21sea%21ES%21930356704%21X&curPageLogUid=zvUZKPwPhKVM&utparam-url=scene%3Asearch%7Cquery_from%3A&search_p4p_id=2024120510374417838518589759570004673280_2 edit the URL to www.aliexpress.com/item/1005007134551393.html?af=ler2022 and I get a bit of commission though you still pay exactly the same price. If you all did that when ordering it would make a big difference to me and cost you nothing but a few seconds of your time 😉

[@C5films]

Great to see you buddy. Hope the weather there is better than here!

[@LearnElectronicsRepair]

about 26C daytime at the moment and 19C night time minimum

[@bulwinkle]

I used to repair office machines, electric and electronic typewriters, calculators, dictation machines mainly. The first port of call in no power cases was the mains plug and cable. Often the plug was incorrectly wired and, or fuse blown. Another common failure was that on equipment where the power cord entered at the back conductors were broken where the device had repeatedly pushed to the back of a desk against a wall.

[@OnStageLighting]

The Internet : Capacitors! Reality : Mostly Not Capacitors. A high proportion of my customers have a line that goes like "I looked it up online and it said some capacitors need replacing." For literally any fault..

[@DrFiero]

Unless it's an older Samsung monitor. Then.... it's the caps. ;)

[@heyjohnsmith]

Followed your powerline repair video and replaced 3 Caps with my TP-Link pa7010. Unfortunately didn't work out, notice there was also some red gunk under the smd bridge rectifier, planing to replace that next. Will check out this video first for more info, thanks!

[@georgeprout42]

MLCCs can fail open circuit as well, but because the device usually carries on working, nobody ever notices. Same with surge protection MOVs, they're great at protecting against power surges, until they aren't doing anything as theyre open circuit. And theres no way to know if your expensive "protective" extension lead is working or is now just a regular extension lead without a destructive test.

[@giuseppemangeruca6898]

Thanks Richard 😊

[@LearnElectronicsRepair]

Your'e welcome

[@Dutch_off_grid_homesteading]

Heya, yes 1 more great video aboout fault finding's

[@greengrayradio1394]

Good info! About electrolytic caps, yesterday I was measuring some 22uF 25V Philips axial 'lytics bought ca 1991. All had the same high ESR (9-10 ohms@100kHz, 6 times higher than recommended) I wonder, could they have been affected by an early "capacitor plague" ? Earlier caps, same value, from them read less than 2 ohms ESR

[@patrickcraenen5163]

Hello Richard, Very interesting video, especially for beginning repairers 🙂 Maybe you should mention that when you replace a trim pot for a critical setting, you should set the new trim pot to the same position or, if possible, measure the old trim pot with an Ohm meter, and re-adjusting the circuit will probably be necessary. Cheers!

[@LearnElectronicsRepair]

Yes that is worth mentioning, thanks

[@oefzdegoeggl]

About this "don't replace a fuse with a wire": Does that also apply if the wire is a "proper calibrated" one? 🤔😄

[@JustInspiredKent]

Lol, someone's been watching another KZbinr. :))

[@chantalslut]

Does a nail qualify as a wire? We all done it.... :-)

[@DrFiero]

@@chantalslut - As long as you never replace a 16ga nail with a 2 penny! Hahahaha

[@perkulant4629]

Proper calibrated wires are ok when there are other protection devices in play.

[@andymouse]

No Idea how old you are but we used to have to buy fuse wire and it came with different current carrying capabilities, this was typical for house distribution panels...so don't laugh !! there is calibrated wire !

[@kpilab1415]

nice

[@perkulant4629]

I’ve seen a load of super capacitors recently covered in a white frosty substance. No sign of moisture anywhere on the pcbs. Wasn’t sure if they had leaked slightly.

[@perkulant4629]

Almost like a powder I should have said.

[@j3ffn4v4rr0]

@@perkulant4629 Yep, sounds like a leaky capacitor...that's the electrolyte that came out and dried up.

[@sharymens8187]

does tapping during reflow really make a difference?

[@LearnElectronicsRepair]

Well it won't do any harm if you do it right and it may help. Perhaps I should do some experiments...

[@sharymens8187]

@LearnElectronicsRepair just curious haha thanks!

[@sharymens8187]

Pressing down might also cause balls to blob together I think

[@j.lietka9406]

Is the "Dry" solder joint the same as a "Cold" solder joint?

[@LearnElectronicsRepair]

Yeah different name same problem 😉

[@j.lietka9406]

@LearnElectronicsRepair yes, thank you again! 🤓

[@PaulBaur]

I prefer the chocolate MLCC over the strawberry.

[@LearnElectronicsRepair]

With me it depends on my mood at the time...

[@lrdisco2005]

Magic smoke escapes.