Samsung PS51D6900 Plasma repair

[Fabimann]

Hello

I really need help repairing my Plasma TV.

2 weeks ago i was watching a movie when i suddenly heard a noise and the screen went out. I could still hear the sound of the movie.
So i wanted to try and restart my TV but it wouldnt turn back on. It was stuck at a blinking Power LED (5 times).

I did some googling and eventually found out that my Y-Sustain board was broken, because as soon as it was connected i wasn't able to measure a vs voltage.
Upon inspection i saw a broken cap and replaced it, which didn't work because it still had the same problem afterwards.

So i bought a new Y-sustain board and now the screen turns on but it still shows no picture, so it's all black, and sometimes the screen shuts off for like half a second. (Also whenever i press the menu key are something on my remote).
I already tried the thing with the testpatterns: https://www.badcaps.net/forum/showpo...61&postcount=2

(I didn't have a cable, so i stuck a probe of the multimeter between the pins)
The screen turnt on but i didn't have any picture again. Now i don't know if that means, that the logic board is defect too or how to go on from here.

Thanks for your help

[Fabimann]

Re: Samsung PS51D6900 Plasma repair

https://imgur.com/s8QEjEM

Image of TV

[sordids999]

Re: Samsung PS51D6900 Plasma repair

Have u checked that voltages from your boards are matching your panel sticker voltage settings for examples
VS,VA,VSC,VE

[Fabimann]

Re: Samsung PS51D6900 Plasma repair

I just measured the voltages:

VS should be 207: is at 207.5
VA should be 58: is at 58.2
VE should be 80: is at 102!

And i can't find where i can measure the VSC voltage

[Fabimann]

Re: Samsung PS51D6900 Plasma repair

Ummm, im kind of ashamed to say, that i forgot to connect a cable on the Y-sustain board :/
Now my TV is showing a picture again.
But the voltage is still way too high!

[mmartell]

Re: Samsung PS51D6900 Plasma repair

There's an adjustment pot for Ve on the zsus. Post a pic of the board if you can't find it.

Are you sure you're placing your probes correctly? Usually ACROSS a resistor...

[hispeck]

Re: Samsung PS51D6900 Plasma repair

Hello, i have one am working on at the moment, when i connect the flat cable from the logic board to ysus, the tv will show smart and display channel and go off i will hear the relay click and shutdown at the same time will restart , but if i take the flat cable off the voltage will stand.

[Andrew F. Ali]

Re: Samsung PS51D6900 Plasma repair

Your Logic Bd. may be faulty.