Samsung HP-T4254 Problem

[crdz66]

Hi Everyone.
Need you opinion with my Samsung Plasma 42" problem.

I have a very white mark on the Left Side of my tv (X-Board Sustain Board Side) and once I get Video there are a lot red dots running on top,bottom and Right Side on my and the white mark still remain)

The Second Pic is when I turn off the tv.

Check voltages power supply-sustain boards good
Check voltages power supply-main board (Missing 12v, rest is fine)
Check voltages power supply-bottom buffers or drivers fine.

Another I did it was disconnect the buffer bottom board from power supply and once turn off the tv, the black shadow spot no show up.

Any comment can be appreciate.
Regards

[tom66]

Re: Samsung HP-T4254 Problem

When the TV is off, you still see the screen lit up??

Likely, your problem is with the Vset or Vrst voltage, can you post a picture of the panel sticker (white sticker, "NTSC/PAL SAMSUNG SDI" on plasma panel.)

[crdz66]

Re: Samsung HP-T4254 Problem

Just for 2 Secs. if bottom buffer is connected.

[crdz66]

Re: Samsung HP-T4254 Problem

pics

[tom66]

Re: Samsung HP-T4254 Problem

OK, that may be normal shut down procedure but there is noise on picture.

Panel sticker is on inside of TV.

[crdz66]

Re: Samsung HP-T4254 Problem

Sometimes x-board buffer make noise.
pics attached

[tom66]

Re: Samsung HP-T4254 Problem

Along the power connector going to the Y-main, do you see pins marked Vs and Va? Check the voltages on them.
It is normal for the sustain boards to make noise due to the very high currents flowing.

[crdz66]

Re: Samsung HP-T4254 Problem

205 volts going to y-board and x-board.

[tom66]

Re: Samsung HP-T4254 Problem

What does Va measure?

[crdz66]

Re: Samsung HP-T4254 Problem

63.4volts

[tom66]

Re: Samsung HP-T4254 Problem

So both those are good we need to find Ve and Vsc. Can you post pictures of your Y-main and X-main. It is best to use daylight and not flash as flash creates glare.