Easy way How to test Capacitors, Diodes, Rectifiers on Powersupply using Multimeter
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- Опубликовано: 25 янв 2014
- Best Easy Way How to Accurately test Diodes, Capacitors, bridge rectifiers in TV power-supply boards, "how to use multimeter" to test or read TV parts in power circuit boards commonly in LCD, Plasma, DLP TVs. This is What every Tech must know when Testing TV Powersupply board, How to accurately test Diodes, Capacitors, Rectifiers in TV power boards using Multimeter this applies for any TV power boards like Samsung, Sony, Vizio ect...
Tips to test TV power-supply, Enjoy 8^) 
Хобби
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Tampatec
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Tampate
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I am 35 years as an electronics engineer, with massive fault finding experience. Sure a good multimeter (DMM) is the backbone of your test tools but my fault finding life changed the day I started using a V-I trace (curve trace) about 25 years ago. One reason it beats a DMM for resistive & V drop tests is it uses an AC drive source to test rather than DC as in a DMM. The first one I had was a home made unit from a magazine article which plugged into my scope but then I got a good a PC based instrument (Diagnosis Pinoint which does a lot of other funky stuff like boundary scan & ITC back driving) that displayed several ranges on the screen at the same time. The V-I trace lets you very quickly see the unusual without having to interpret numbers then you can use a good DMM to confirm it. Nowadays there are cheap V-I trace units. The advice about bulging elec caps is spot on. If they are not generating heat themselves, they have been subject to it. Never re-install a capacitor you removed to test...bin it & replace.
Great video. It was nice to see you double check that diode that first appeared open. For years I worked with supposedly good technicians that didn't have the sense to do that. Then they would say that all kinds of parts were bad and the board should be replaced. When in reality, it was only 1 or 2 bad parts, or even none (bad or missing solder was a common problem).
This is an excellent video, very informative. We'll be repairing some damaged power supplies this week in our semiconductors class. It's always good to watch and learn from a professional before attempting the work.
I noticed that when you prepare a component for testing, you so called take it out of circuit. Be aware that although this saves time, this method has some pitfalls.
For the viewers out there, the component should be physically removed from the pcb.
If you leave it in situ, the hole could be through plated & there will still be an electrical contact or another issue is that while desoldering it, a minute amount of solder could still be remaining ,hence still making contact with the pcb (though unlikely) it can happen in some situations.
Other techniques that can be used: is if it's a diode , resistor (axial) etc just unsolder one side and lift the desoldered leg clear. If it has 3 legs, unsolder 2 of them and bend the component sideways to clear the 2 legs for testing.
Cheers !
Been looking through your postings and i want to express my thanks. I've become a bit rusty when it comes to my electronic skills (they've been neglected for the last 3-4 years or so) and your postings have helped brush off the cobwebs. Well made videos, good sound and picture quality...keep up the good work, mate!
Greetings from across the pond (the atlantic ocean) ;)
Ted
Hey, I just wanted to say that I can tell that you do this just because you like to help others. You seem like a good egg and I hope that success finds you and rewards you for your kindness if it hasn't already :)
are you a music DJ or not. stop the distracting music and stay relevant
Nice Video. You provided a lot of good basic tips for testing some of the basic components that usually fail in just about everything. Most of the time, if a circuit instantly blows a fuse it's probably something made from Silicon like a Diode, Bridge Rectifier or a Transistor. If the fuse doesn't blow it's usually an Electrolytic Capacitor. You pretty much have to desolder and remove them from most boards to test them properly. If all of these guys are good look for an OPEN Resistor. Another good tip is Resistors do not short, they Open when they die. I also like that you mentioned the phrase "When in Doubt, Take it Out". That's the best way to test most components with a multimeter. If you can learn how to test the maybe 5-8 basic components with a multimeter you can quickly find the solution to most problems in electronics without a schematic. Good Job!
This was the best video of the many I looked at... Thank you. No one explains anything - you did very clearly.
Great video for someone starting out. I started out fixing old tube sets, nowdays you can find CRT tv's by the curb or as friends etc. not to throw them away, they are good to practice on.
Thanks Tampatec, you explain in easy to follow instructions ! Thank you for sharing your knowledge ! The little schematics are fantastic and explains with technical details ! Wonderful mate ...!
dude, great video! way better than anything else I've seen covering this topic. Thanks!
share this video to anyone it may interest and like the vid if it was informative, thanks for your support.
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+Tampatec Thanks for the vid. I am trying to repair my Samsung LCD power supply. It does not switch on and standby light remain off.
I have changed the main 6 capacitors even though they did not seem blown, to no avail. I have noted that whilst the PSU is being supplied with power, it is not converting to DC properly. The the connector which connects to PSU to the TCON board has no power on any pin. Even the PSU fuse- only 4v are passing through it and it is a 250v fuse (europe voltage).
The bridge rectifier is good. Input AC 220 and output DC over 300V. I assume this is good or shall I still test it out of the circuit?
Where would you suspect this is coming from? The transformer or something else? Also there is a white resistor 5W R12K which is slightly deformed on top (not smooth)... or is this normal?
Thanks again.
+sciclunam check bridge rectifier for dc volts and check voltage regulator for dc volts for standby volts.
+Tampatec Thanks for the quick reply. The bridge rectifier is good. With the power on Input AC 220 and output DC over 300V. I assume this is good or shall I still test it out of the circuit? Re Voltage Rugulator... should there be only one as I am seeing 6 or more components which look like it all screwed to heat sinks. How can I recognise it?
+sciclunam .
+sciclunam .
Thanks for making this! Let's bring back repair and reduce throwaway culture. Thanks for helping us to do so.
Thanks this is very helpful. I haven't soldered in years and have never repaired a TV. I own a TV that is famous for failed power supplies. I removed the PS and have noted the tops of most of the capacitors are puffed outwards. With help from your video I'm going to test and probably replace them. If that doesn't fix the TV then I'm only out a few bucks and got some practice testing and replacing components.
Bro….. You are awesome. I'm just getting started in learning this stuff and you are a godsend. Keep on being awesome sir!!
Rahiem Martin hg
Great vids, T-tech. Way to give back to the community.
You sure do make desoldering look easy! Great video! :thumbs up:
THANK YOU SO MUCH FOR THIS VIDEO ! I WOULD LOVE TO SEE MORE COOL HOME APPLIANCES, GAMING CONSOLES, COMPUTERS, THANK YOU FOR DIAGNOSTIC SKILLS !
Thank you for all the information you provide, I was able to repair my 65 Vizio
thx alot brother keep doing like these stuff ... actually am power engineerin but am too bad practically only good doing mathmitical exams lol its soo usefull
Thanks for taking the time for the videos fella
Thank you for this video, I really learnt a lot from it. I’m a beginner in this field of electronics. Thanks for helping out buddy.
At 3:00- you can't check a bridge like this. From a single terminal to the other three, two connections will read like diodes but the third connection will be reading two diodes in series. That's where the 0.9v is coming from, roughly 0.5v + 0.5v in series = 1 (0.9 actual reading in your case)
It's clever how you cut out the section of the between using the solder sucker to testing the components. I imagine because it's not a simple matter of hitting the lead once with a solder sucker to clear out the hole and it probably took a good deal of fiddling around to get it clean enough to test like you do. If it's not very clear of solder the lead is going to short to the sides.I'd be surprised if you were able to do it at all. It's easier to pull the part out and test it as in that case you don't have to get the hole perfectly clean.
Right Davey Hi And another thing is, some of rectifiers i get even done 0.3 and 0.25 and work perfectly this depends of the power of de diodes a rectifier of 2 Amps can give you 0.5 but a rectifier of 8 Amps can give you readings of 0.3 and even 0.2 in the diode scale mode. And a rectifier when goes bad is 80% some diode goes short and 20% they can goes open and thats it i never see any rectifier alter interior pn or np juncion in others values and working bad. Just my opinion.
i searched for this comment .. 😊i knew someone must have noticed
im assuming that the optocoupler or the voltage reference ( x431 ? or equivalent) is bad
Thank you for explanation, tuo help me so much. Great!!!
Thanks, great tips, much appreciated.
Thanks man. Good walk through!
Outstanding Presentation
Tremendously helpful!
Thanks guy!
tankyou
specialty for your explain and writed explain on video
Thanks for the reply mate appreciate it and for the info.
Odd thing is this short only just started happening after I done a capkit :S
It's a Kortek KTN 20
Thanks dude I didn't know about taking components out of circuits. Thanks.
Took me forever to find the standby.. On mine (Darfon brand) it was marked STB5V. Sure enough 0DC v.
The fuse was easy to test, now hopefully i can test the other components accurately.
Fantastic. Just the right thing....to keep me going.
very good vid. informative & additional written comments are excellent. will check out other vids
you rock man
thanks for all this effort, really appreciated
no prob, glad to help 8^)
thx man, btw excuse me I need to ask, do you have any videos that show how to start checking any damaged board? I know this was one, but I wanna know if you got stuff like that, explaining for example the role of parts as well, or if you know a vid like that. Im sorry I didnt check everything u got man Im so lost at work lmao
thank you very much in advance
5:21 - the diode in that position will appear to read as a "short" because it's in parallel with the windings of that transformer.
You can see the traces coming from the transformer. ;)
He mentions that around 6:45
Nice Video DUDE !!!
I just want to know that how to check DIODE and capacitors CORRECTLY....and this video is very HELPFULL or i can say FULLY helpfull
thank you for making it look so easy.
I was able to fix my tv from what I learned watching your tutorials. What wattage is your soldering iron?
Thanks Great diode and capacitor checking .
Thanks, man. Good information.
Very informative, Thanks!
Great, presentation.
Thanks bro this is very wonderfull i can't leave without saying thanks and i will subscribe
Love your videos bro. You know why? Cause you speak clearly, directly and your videos are quick, to the point and helpful. RARE on YT these days.
joshua lutz thanks 👍
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Great explanations. Many thanks :-)
You are awesome...unfort nobody repairs tvs nowadays....they are disposable
Thanks for the testing tutorial.
your the best to explain
thx man thx so much for your efforts
Great tip's Thanks.
Great informative video. Thanks for sharing!
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Good info. Thanks.
I wish there was youtube when I attempted to make a living repairing AV gear. I used to sometimes used a lazy trick of cutting one end of the component I was testing, to do a out of circuit measurement. Then resolder the re-joined leg of the component on top of the board, if it was ok. I am not proud of it.
But I guess you probably know about that one. ;)
btw there used to be a capacitor tester that was supposed to be able to test cap,s in circuit as it used a low voltage I think. Also ESR reading. Am I right?
Anyhow. Keep up the great work.
Cheers
THANKS A LOT BRO....FIND THIS INFORMATIVE....
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I have serval Flukes now but still one of my all time favorites was the fluke 12!!!
thanks so much for this videos
thanks boss.....................
Thanks for the video.
Very cool. Thank you.
Nice thanks a lot muchas gracias saludos tijuana love
Thanks man nice work
nice vids !!! :)
First off great vids man, ive got a lg plasma where the stand by stays on push the power no response no relay clicking, stand by is 5.3, all caps seem good, sny ideas, just need a place to start tia
Thank you for this great tutorial! I have a limited knowlege of electronic, but with the help of guys like you I usualy make it. I am reparing a computer psu. Two transistors are dead. They are labeled UTC UF460L 54 PCE1. I found a lot of UTC UF460L but none with the 54 PCE1 insciption. Should I care for the 54PCE1 or any UTC UF460L will work?Thank you for your time.
Thank you so much !
Fantastic video.
thank you sir too much. share some more video ........i like your video
nice sir, very helpful thx
thank you for video
Tampatec, Very informative video. I'm in my training wheels mode when it comes to component level troubleshooting. What brand solder sucker was that? I didn't see it on the list. My next question was I saw you have a butane soldering gun. In what instances would you use that over a electric 40 watt pencil. I suspect there must be times when instant very high heat is needed? I was reading about installing optical lasers or readers and you have to reach a certain temp on them earlier when you install them and how sensitive they are to static, ie. unplug soldering gun when up to temp. I did some work at a hospital and picked up 2 identical Samsung 50-55" flat screens for free. Haven't powered them up yet but I'm hoping they have a easy to fix power supply issue as they were marked 'Dead no power"and hoping to get one of the 2 working using the second for parts if needed. Free is a good price to start from. I know it is very important to drain the capacitors in a TV after you power down or at least it was in older TV's. Do you have a video on how to do that? I know you need to put them to ground. I'm in the process of learning how to restore old radios which is certainly a lot easier in terms of component size and simplicity. And to clarify the 0.3 to 0.7 reading on the diode one way is a resistance reading so that is Ohms?Thanks and looking forward to your other vids, Doug
So helpful.
Nice video. .thanks boss
+Tampatec please explain some more about Apple monitor repairs.
Thanks.
Thanks a lot the video was very helpful. Could have been much better if the zoom was good on the pcb. Still you rock man.
C est formidable comme video thinks man
👍🌟🌟🌟🌟🌟😎Many thanks for sharing
Very great vid
Great presentation! I took a power board to follow your steps and came across 3 look like transistors, but upon researching found that they are N Channel Power Mosfets. Can you explain what they are and are they similar to a transistor. I know mosfets I have dealt with (8 leg)have a source, gate and a drain . How do you test these? I get .455 on one side and OL on the other side. The part number is K3561 AND K3683. Thanks for the advice and great videos................Phil
Terima kasih banyak....
Thank you so much
Awesome video op. I do have a question what kind or iron solder is good to use?Are those $5 iron solder good enough or should I buy a better one and where to get that kind of multimeter
i will need more tips from u on tv repair
BRO,, you are a very smart man ,, I GOT MAD RESPECT FOR YOUR TALENTS,, I could never do this kinda stuff but now I know what some of this stuff looks like when I see it . Thanks God we have people like you in the TV business. AWESOME VIDEO BRO !!!!!
great videos
Thank you.
do you repair guitar amps .i keep getting trouble with a fender hot rod deluxe,great tuition vids by the way thanks for taking the time.
Thank you for your videos. I have a samsung tv that blinks once when plugging in the power cord, but is blank with no picture afterwords. Before this happend it was turning off randomly then rebooting itself after a few seconds. I know the common fix is bad capacitors, but I took the power supply board to my two local electronic stores and both agreed that none of the capacitors looked blown or oozing out fluid. I replaced a good amount of them today and it is still not working. Do you have any idea what the issue might be? Thanks!
Very educative
Hey man, I love your channel. Do you live in Tampa FL by any chance?
Is it possible to unsolder only one leg of a component and then check the reading with a VOM? I enjoy your video clips and watch all of them. Thanks for all the efforts you expend in making them.
One of the fuses had gone on a 42" lg of mine.
So I changed the fuse over and started her up and heard a big pop! After turning the power off and testing the fuse the one that was blown before is testing fine. In fact all the fuses seem to be. Also I am getting all the correct voltages when testing the vs and va.
thanks for sharing your skills here, a question, i get 10 red led blink code on viera plasma, what's that 10 pulse refers to on those tvs?
Svaka čast
thank you for explained, but can you till me please which symbol you choose on multimiter for to test capacitor.
Hey! What is that tool you used to cut the capacitor from the circuit? Thanks for your video!
Very helpful
So what did the problem wind up being on the power board?
We are still looking, might have to give up on it.