Digihome 32" LED TV

[joehezzer]

Re: Digihome 32" LED TV

gotta go out am afraid tom so will do this when i get the chance, the missus calls lol. having a look at the set for a friend. much appreciated Tom

[joehezzer]

Re: Digihome 32" LED TV

cheers guys for helping me out, i was looking at it for a friend of a friend, i did not want to mess with it to much as i think they are gonna claim for a new set on house insurance.

[unit22]

Re: Digihome 32" LED TV

Hi, I'm new to the forum, wondering if you can help me out as my tv just died.

I have the same board as joe (17IPS19-3)

Tested the both 400v capacitors and they seem fine (360v)

OK 340V is fine. Next, see here, check voltage from red points to ground.

I then tested the diodes with the help of toms diagram above. I am getting -26.9v on the top 3 diodes and 26.5v on the bottom 2, does this mean they are knackered? Thanks for any help

OK, each of the diodes I pointed out, can you unplug TV and check them on ohms. Any shorted? Hold probes for 5 seconds before reading.

Also tried this, I am getting 00.0 on the top 3, but I am getting a reading that is rising on the bottom 2 (00.0 all the way up to 30.8 until finally stopping)

[unit22]

Re: Digihome 32" LED TV

I then tested the diodes with the help of toms diagram above. I am getting -26.9v on the top 3 diodes and 26.5v on the bottom 2, does this mean they are knackered? Thanks for any help

Sorry I meant "-26.5v"

[unit22]

Re: Digihome 32" LED TV

Any advice please? Thank you

[selldoor]

Re: Digihome 32" LED TV

Well you have the same ohms test results as Joe so you can do as Tom said in post 18
or just replace all five diodes.

[unit22]

Re: Digihome 32" LED TV

Well you have the same ohms test results as Joe so you can do as Tom said in post 18
or just replace all five diodes.

Thanks selldoor, much appreciated. I will go for replacing them all then, will let you know the results.:-)

[unit22]

Re: Digihome 32" LED TV

Hi all, just soldered on the 5 diodes and it worked :-D I am so chuffed thank you for the help!!!!!! Great forum!

[selldoor]

Re: Digihome 32" LED TV

Well done - nice to see a fix

[MaxTheMad]

Re: Digihome 32" LED TV

Hi, I have the same Vestel PSU board in a 32" JVC LED TV. I have replaced the 3 top diodes shown in the pic in post 12 as one of them had shorted. The PSU now powers up and I can measure 12.4v on the top lead of the 3 diodes I replaced. However the the TV still does not switch on. I fitted 3 SB5100 diodes, but on further inspection, noted one of the 3 original diodes was a SB5BO. Could this be the problem? Any help greatly appreciated, there does not seem to be any of these boards on eBay at the moment.

[tom66]

Re: Digihome 32" LED TV

They would probably not cause an issue if 12V is OK. Does the power light blink at all? Is it lit or not?

[MaxTheMad]

Re: Digihome 32" LED TV

Thanks for your reply Tom, no I don't get the power / stand by light.

[MaxTheMad]

Re: Digihome 32" LED TV

Hi again, just been told that the this TV does not have a power light. The PSU board emits a noise a little louder than the background buzz for a few seconds when first powered up. (When working the TV would turn on when plugged in and not go to standby) It also does this when I press the power button on the remote as if it is trying to turn on then giving up!

[llonen]

Re: Digihome 32" LED TV

I have similar problem with a toshiba its fitted with the same board, currently I am seeing 340v across c116 / c121 as indicated, on the Isolated side I am seeing 7.4 volts to ground on D318-D320 and 0 volts to ground on D206-D208. Neither set of diodes appear shorted. The set flashes red/green but no other start.

[selldoor]

Re: Digihome 32" LED TV

Your board may be slightly different from the above Vestel make changes all the time
https://www.badcaps.net/forum/showthread.php?t=39740

[Sixyearcycle]

Re: Digihome 32" LED TV

Hi there guys,

I just wanted to say a big thank you to tom66 and to the other people on this thread. I am a marine electronics specialist but tinker with ham radio (2e0kai uk) and all sorts of other electronics.

I have the vestel board from the picture in the first page in a toshiba 32 inch TV.
I was head scratching regarding a fix as I'm used to seeing at least some visible sign of damage like scorching or bulging caps etc.

My board is identical except I have three diodes top and bottom.

After searching and finding this thread I promptly snipped the diodes and found a single one to be faulty showing on the diode test of my meter. I replaced it with a 3A equivalent and voilla!

Now stress testing the TV with xbox360.

Thank you again.

Six

[FerLigt]

Re: Digihome 32" LED TV

Hi,

I´ve got the same problem and I want to replace all 5 diodes to be save.
There are 3x "UF5402", 2x "SB5B0" and 1x "SB5100 2019"

The SB5B0 and SB5100 are both 100V 5A, can I replace them with 1 and the same 100v5A diode or it there a reason they used different type?


and can I use any 100V 5A diode (for exaple SF52) or do I need to use the same one?

[tom66]

Re: Digihome 32" LED TV

Replace SB5B0 and SB5100 with same device (100V 5A schottky.) Do not use a fast recovery or standard diode, must be schottky type.

The other one can be replaced by UF5408/MUR460/HER308G, I recommend upgrading the voltage rating due to a design flaw (Vestel exceed voltage rating on power-up which causes early diode failure. Among other causes.)

[FerLigt]

Re: Digihome 32" LED TV

thanks for the fast response tom!
I´ll order the higher voltage diodes and let you know how it works out

[FerLigt]

Re: Digihome 32" LED TV

Sorry for keeping you waiting, but today I´ve changed the diodes.
3x SB5100 and 2x HER308G and it works!



But now there is an other problem, L502 is buzzing a bit.
(not sure about the english name of the part hehe )

I am sure it´s L502 that is buzzing, because when I touch it with a screwdriver the sound of the buzz changes. But it does not go away.

Anything I can do about that?