Olevia lcd tv continuously blowing a cap on power supply

[llanero75]

Hello, first thread
I need some help
I have an Olevia 37in lcd that its constantly blowing the same capacitor over on the power supply. The first time I replace it with one from a used board with the same voltage but higher capacitance and it blew a few hours later. Then I installed a new one bought at radio shack with the same voltage and capacitance from the original and it went out again after a few hours of use.
When the caps blows the image is gone but I hear sound, after I turn off the tv and try to turn it on again the logo comes in for a split second and then the tv turns off
What could be the problem here?
Any help will be appreciated

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

It could be that there are bad caps on the other board that is fed by that power supply section, also the cap must be LOW ESR type not general purpose type.
You also need to upload good clear pictures of all the board and the whole backside of the TV.
Which power supply section that you replaced the caps?

[CapLeaker]

Re: Olevia lcd tv continuously blowing a cap on power supply

Let me guess... the cap that blows up get's really hot after a few minutes of use? As budm said, there is probably a different board that has bad caps, that is fed by that power supply section.

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

I will post some pics later today and will check the other boards. I was thinking also like budm said maybe it was the cheap generic cap that I bought but will see. I'll post later when I get home

[ReeceyBurger123]

Re: Olevia lcd tv continuously blowing a cap on power supply

Ive had it where a partially shorted diode blew the caps on a samsung home media centre quite hard to diagnose. Check and see what voltage is going through the cap and see that there isnt voltage on the negative side of the cap.

[stj]

Re: Olevia lcd tv continuously blowing a cap on power supply

yes, a bad diode hitting the cap wih AC or a voltage that is too high.

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

Post 1 "I replace it with one from a used board with the same voltage but higher capacitance and it blew a few hours later"
If it has shorted diode, it won;t be running for hours before the caps blew up.

[stj]

Re: Olevia lcd tv continuously blowing a cap on power supply

but a leaking one could cause that.

knowing the voltage rating of the cap may help.

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

but a leaking one could cause that.

knowing the voltage rating of the cap may help.

Yeah, but that will have ac ripple and Voltage will not be stable for the power supply to run and unable to regulated and able to run for hours.

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

probably same as this:
https://www.badcaps.net/forum/showpo...3&postcount=28
https://www.badcaps.net/forum/showth...ps+blow&page=2

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

Hey guys update is here, all of your suggestions opened my mind specially budm's, and I think I might have found the problem. Here are two pictures, the first with all the boards uncovered and the second one showing two caps blown on a small board to the left of the power supply that is fed by the section of the power supply that I was having problems with. You guys are awesome.
As soon as I replace these caps I'll update to see if that fixed the problem
Thanks a lot

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

I'm sorry, for some reason I can't post pics, I'll keep trying

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

Ok I did it

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

Good, you found the cause of the problem, make sure to use Low ESR with 105c temp rating for those two caps on the inverter board.
This why it is important to show the pictures.

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

Thanks again
I have a problem with another tv that was given to me some time ago for my kids if I can fix it of course, that has a different problem, but I will open a new thread and maybe you can point me in the right direction

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

What is a good brand of capacitors and where can I buy them

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

I use PANASONIC FM/FC/FR series for all my repairs, you can get them from DIGIKEY or MOUSER.
https://www.badcaps.net/forum/showpo...2&postcount=65

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

Cool and thanks
Do you have any advice on the other thread that I opened?

[llanero75]

Re: Olevia lcd tv continuously blowing a cap on power supply

Hey guys update
The tv been working for 4 days, the boys are gaming, movies, etc etc
Thanks a million for your guidance

[budm]

Re: Olevia lcd tv continuously blowing a cap on power supply

Thanks for the follow-up.