Tv power supply board Repair - JVC LT-49C770 no power

[@MrBurny23]

Hi sorin thank you for your TV repair videos I've just fixed my first TV It was the psu Using multi meter I've used your methods and found that a schottky dioid Was faulty. Took out 3 diodes in parallel mode And tested out of circuit Found one of 3 faulty Voltage going both ways. Manage to find data sheet on Google And replace with part from a spare TV psu dioide with same specifications . And bingo Red standby light came to life. Brilliant teacher We saved more TV 's for scrapheap 😎👍

[@als1035]

I love how you take the time to analyze the problem and then troubleshoot it using your brain. Too many people start replacing components without thinking it through. I'm glad to see that you are happy to provide that experience with others on the channel.

[@danroy5883]

I'm addicted to watching your videos. You are the Bob Ross of electronics repair.

[@geraldspratley4637]

Recycling components is cheaper, practical, and more often than not, usually these older components are better quality. Well done Sorin.

[@wefukthenwo]

If you're going to re-use 2nd hand components and need to test them so they're within specs, use one of these cheap, $20 LCR-TC1 Multifunctional Transistor, Resistor, Triode Capacitance Tester. The best tool I have in my arsenal.

[@vilim6304]

I recently repaired that board, only I had burned out ic 1q001, I didn't see anywhere on the net that it was burned out, it's mostly the case like yours. I had no voltage anywhere on the secondary, everything else was fine except ic 1q001. Greetings, you have my support .CROATIA.

[@MrTBone-yp6dd]

Hope you can feature how to repair a Samsung T-Con Board. Awaiting for this topic. Thank you Sir😊😉

[@MiguelBaalm]

You should try using an AM radio to pick up the switching noise from the PSU. Such radios can pick up the EM interference that the switching causes.

[@zx8401ztv]

I often check capacitors taken from a switchmode with an esr tester, just to make sure :-D. Switchmode supplys are more picky for low esr types.

[@eazybluezy]

Thanks for sharing your knowledge. Would it be possible for you to announce the temperature and fan setting of your hot air when you use it to remove or install components? That would be very helpful for someone learning these skills and striving to achieve similar results.

[@euphoria_7477]

I'm happy to see you buying some quality tools. I find it really hard to take seriously fixers that use low quality junky tools!

[@mladen1000]

otherwise it is not worth dealing with any fool like you, but when you already want to know, it is not a tool that makes a repair but the knowledge that stands behind a man who uses a tool

[@euphoria_7477]

@@mladen1000 No idea why you're mad about me saying I like his new tools. But, a good tool makes a big difference regardless of your knowledge. A tool is an extension of your hand, may as well use one that works and feels good.

[@mladen1000]

@@euphoria_7477 I'm not mad at you for loving his new tool, but who are you to judge people what tools they use in their repairs...( I find it really hard to take seriously fixers that use low quality junky tools!)........

[@euphoria_7477]

@@mladen1000 I'm me, and I have the freedom to think or do anything I want. Have a good day, sir.

[@emrekurt6801]

thanks teacher...vestel board..made in TURKEY...good job...

[@davidlguerr]

I guess people get triggered by someone using recovered components, because they think they will die soon. Sometimes the used component is better than the new one, because the older one was from a reputable manufacturer and the new one is a cheap chinese.

[@jeroenvtec]

@15:42 at the right (near pip) is a 160v cap. tv is working but how is the sound check with the younger guys ??

[@force4200]

Hello were back !! So common cool. Great you repair powersupply and explain. The first most important electronic thing to repair.

[@Will_Mairena85]

Nice video , I am going to search black karma video to see more explanations like this.

[@Mark1971-1]

Fantastic video I honestly thought it was the diode like a few of your other videos but that wouldn’t explain the noise that could be heard am I correct in thinking that

[@skysurfhf]

@sorin how you know where is ground on that PCH ? i always has difficulty to see that ... can you explain that ? i am a noob ... thanks ... or, can anyone try to explain to me ? thanks in advanced ...

[@ljubopobric5385]

I like when you talk about poeple comment your videos.. you are so funny and relaxing to watch.. Best Regards Sorin

[@Davysguru]

Mr. Sorin, please make a video on how to repair loose ram slots on laptops...and if possible how to replace the slots.

[@fivedotsdave9723]

Thanks for that hearing info, it explains why when my wife screams in a high pitched voice I don't hear anything she says....

[@johnoddvar1967]

TV is woth a try. I have repaird some, given up on others. What is for sure is that a lot of tV,s are thrown away for smal damages. Thank you for this video.

[@8500gtNvidia]

Nice one! But what was doing that Mosfet? It was regulating the current?

[@amanyadennis9683]

Good explanation Sir.I love electronics.How can one get lessons?

[@banellone]

Hi Sorin. I had for repair tv psu, my first. Same brand. It was double diode in to220 in my case. Electronics is beautiful.

[@wisher21uk]

Great fix Sorin I have done loads of them vestel boards

[@viocaia]

I'm musician..a little older then you..I can barely hear 10Khz..so ..welcome in the family! Go on bro..

[@MrRvdbeek]

Nice job 👍🏻 thank you for the explanation how to diagnose the fault.

[@mechanicallyinclined9320]

There was a 100uf 160v in the top right at 15'34 ; )

[@ODRACLIVE]

Thank you, Master Sorin!

[@MarcoPolo-zv1ft]

Thank you so much you are the one who made it easy :)

[@daz41262010]

excellent diagnosis sorin :)

[@6siqueira]

Where is the black karma video? I can't find it :(

[@bblod4896]

No Dodgy repair today. Good job Sorin.

[@ianmorris8534]

Hi, your explanation of different Hz hearing with age explains why Justin Bieber sounds so effing awful!

[@gonedoneggonedoneg9863]

Valuable japanese piece of electronic art

[@neelbanerjee3086]

i think sorin the output current control mosfer burnt. because of the colour of the board and that is why the output diode showing the short or after shorting the mosfet the 1 biode get burnt also .

[@excitedaboutlearning1639]

my prediction to Sorin's question at 6:03: The three components in parallel and the capacitor or only the capacitor are at fault.

[@danielsaturnino5715]

Nice. Thank you Sorin

[@karldecauwer2183]

how do you check "repaired" tv power supplies if you don't have the tv.?

[@Infiniti25]

Maybe join the ERS Discord and ask people live. invite.ers.repair/

[@karldecauwer2183]

@@Infiniti25 discord server is down ?

[@Infiniti25]

@@karldecauwer2183 no? I’ll get an admin to check...

[@karldecauwer2183]

@@Infiniti25 I am in as KarlDec since a couple of years, but I don't see ers anymore

[@Tiyagi99]

Hello Master Sorin.

[@TheLebaneseGuy]

U are the saver of the day

[@roseelectronics4582]

This one reminded me of the black karma video.

[@FUNDISUMA-r5l]

Thanks you are so good

[@felixfredrik5461]

Can you do a video on crttv power supply

[@kevinwheeler6407]

Where in the UK are

[@tunjukpandai]

Hi bro,may I ask you something power card Lenovo Thinkpad yoga 11e?

[@josuevillasante2546]

Sorin, check how much voltage is draining the capacitor an put a capacitor whit the same value

[@MiguelBaalm]

I'm guessing it's either the capacitor shorted, someting connected to it, or the diode itself.

[@jeroenvtec]

I have to admit that I haven't commented because I'm still missing some basic knowledge about the global components. I have to watch more video's :)

[@twida9]

Hi, I am that one percent. Thank you!

[@tooler731]

Sorin, its not just age that effects you ability to hear the higher sounds. I think its been scientifically proven that females hear better than males, that's why when I'm watching a hockey game my wife can stand behind me for hours (telling me something) and she can hear herself perfectly while I don't hear a thing from her direction... But when my buddy asks me if I want another beer, I hear him right away. I've said for years that I just can't hear high, whinny sounds because I'm a guy.

[@arielgarcia4199]

perfect as expected 😎👍

[@DanielsGameVault]

You may want to correct the title - it's JVC, not JVS :))

[@bobpercy1]

Using a big screwdriver to point out components and tracks is asking for trouble. I've see lots of people blow up boards because they were unaware the mains was connected. Plastic or wood is good.

[@Jejie1029]

Thanks Awesome

[@SinsBird]

No, Sorin, it's not better to use a capacitor with a higher voltage rating, because a capacitor with a higher voltage rating will have a thicker separator and this will cause it to have a higher ESR and so such capacitor will not last as long. It's ok to use if that's all you have, but it's not better.

[@wefukthenwo]

That's strange. When I test large, high voltage capacitors before I install into circuit, they all have low ESR, However, I find the lower voltage capacitors have the highest ESR and are always the first to drift in tolerance. I do not like using them if I can avoid it. I have been a technician for 28 years. Higher voltage capable caps are always better.

[@SinsBird]

@@wefukthenwo I saw you mentioned that LCR tester, if you're using that, it's not very accurate, just open a few datasheets and you'll see that the ESR gets higher with voltage. The reason why larger higher voltage caps might last longer is that they can dissipate the heat from the ESR better because of their size. To clarify: this is only when talking about same-size caps. If the cap has higher voltage rating but is appropriately bigger in size, it might have same ESR.

[@zameerkhan5807]

Samsung 55 inch tv half screen horizontal line going uptodown what is the problem

[@wefukthenwo]

T-CON board, more than likely. Look for a short.

[@marcobohorquez4711]

Yeah that's the faulty part most likely.

[@zameerkhan5807]

@@wefukthenwo ok but there is not t con board what's next

[@peterferguson2344]

Doesn't everyone have a stash of used PCs for spare components 🤔

[@onetimelifebigcamera1607]

❤❤❤

[@Radek__]

Sorin. The serial or model number of that tv power supply is written on the board. You could type it in google graphics and see a lot of pictures of that board. This could help you to read CORRECT original capacitor voltage and value. beacuse as you said, you don't know if someone before you, replaced that capacitor with correct parameters. You shoudn't copy his choice without checking.

[@markconnors3269]

Pls help my wife can hear a high pitched sound and a burning smell from the back of our jvc tv LT497c760 Would The power board be the problem Tv just went black Won’t come on no lights I’ve unplugged it as was smelly Any help be most greatly appreciated especially this time of year as buying a new one really isn’t an option right now

[@davodamirajam1276]

when the short hapent 905 mosfet or transistor is bad (bexuase one pin used gnd and other pin use vollage diod juast do voltage strite ==> bad caps and mosfet in 90% some time opticopler is bad (if 5volt is gone) so i change 3 of them

[@weerobot]

Cool..Yes i Thought Diode...lol

[@unlokia]

I’m 46 and I can hear up to 18Khz. #Aspergers.

[@wartlme]

I would take out the capacitor to check for a short.

[@OpenYourMind80]

that bulging cap is a problem

[@Texnikas]

master pro :)

[@YoutubeSupportServices]

It's funny how closely related "BULL5h!t" and "high-pitch frequencies" are to aging ears!

[@aleksandarjakimov6830]

I don't see how multimeter shows 0v (short) when you are probing diodes? This is boost converter and the drain of MOSFET is connected between pin of inductor and anodes of those diodes, and source is connected to ground. If you probe between anode of diode and ground, than it is logical that multimeter will show short, because anode of diode and drain are connected at same point, and source is connected to ground so you have closed circuit. But, you are probing with one probe to anode and other to cathode, so there is no closed circuit because cathode is not connected to ground. Weird.

[@electronicsrepairschool]

It is connected to ground, i said it, thru the big switching transformer, so minus of the diodes and source of the mosfet are sharing the ground from the multimeter point of view :)

[@aleksandarjakimov6830]

Than it's not basic boost converter like those booster used in PFC circuit in TV power supplies :)

[@johnbos4637]

@@aleksandarjakimov6830 You don't understand how a transformer works. All transformers measure shorted even new one at the factory. Anything connected to the transformer will look shorted because the transformer is just a wire wrapped around a ferrite core. One side of the diode is connected to the transformer so the diode looks shorted but it is not shorted. This is a common mistake made by amateurs who do not fully understand how things work.

[@aleksandarjakimov6830]

@@johnbos4637 i understand how transformers works. But I thinked that this is boost circuit with inductor instead of transformer. Type "boost converter" and you will see why I thinked that multimeter will not show deadshort when you measure between anode and cathode :)

[@johnbos4637]

@@aleksandarjakimov6830 It doesn't matter what it is. The fix on anything is simply find the bad part and replace it, not spend the next 6 moths trying to reverse the circuit to know exactly what it does. Most people have better things to do with their life, including Sorin, and that is why he fixes things fast without worrying too much about how it works.

[@computerservicenow7182]

I have seen this fault before using a MOSFET as a current shunt is a lousy design there were so many better ways to control this output.

[@Dr.muthanna]

I’m 100% sure it’s a shorted diode but unfortunately it’s not

[@mikanikolic1976]

I still think it's a diode! ha ha

[@ngwanindi]

More TV's sir am in a poor country with more TV's.

[@incognitopassat7102]

Second one...from Malaysia

[@Yoritomo3800]

You can reuse good japanese brands, but don't play much with electrolytics, they are cheap now a day anyway. I use oly Rubycon, panasonic, nichicon and nippon chemicon, nothing more ...

[@electronicshaverightstolive]

They trolling you because they are jealous.

[@mrdutch167]

if your wife can hear the microwave and you don't, then is she a lot younger, lol:-))