Samsung pn43d450a no video help

[crdz66]

Hello friends.

I'm looking for some kind advice.
I get second hand a samsung plasma pn43d450a with no power on problem. He said one day quit working playing video game.

After check power supply voltage, i find a short on y sustain board. Igbt transistor become bad.
So, i bought new sustain board and now the tv is working but no video or backlight activity.

The control board is blink 1 per sec.
The test pattern is not working.
The sound, i don't know if is working because this guy can't remember what was last input he used (composite,coaxial,hdmi).
The normal startup sound from samsung tv is working.

Main board????
The main board need produce the backlight too.

Thanks for you opinions and advice

[Hamie]

Re: Samsung pn43d450a no video help

Check the buffer for shorts.

[crdz66]

Re: Samsung pn43d450a no video help

I check the buffer already too.
No shorts.

Set the negative probe on ground and the positive was sliding along the connectors.

[Hamie]

Re: Samsung pn43d450a no video help

Are the VSC and ve voltages staying up or falling?

[crdz66]

Re: Samsung pn43d450a no video help

Staying

[crdz66]

Re: Samsung pn43d450a no video help

If the test patterns no work means do i have a chance panel is defective???