Samsung 50" Plasma- sound but no picture. Tried several things! Please Help!

[Bmyers21]

Got a Samsung PN50C550G1FXZA version NY02. It supposedly started with a black line across the bottom of the screen, then went completely black.

The unit still has sound, but no picture. I have replaced the X and Y buffer boards and main board, and the power supply board. Still doing the same thing.

I am wondering if the backlight is maybe not working? I also don't know how to test it with the "flashlight test", or if this even works.

Any help would be appreciated!

[tom66]

Re: Samsung 50" Plasma- sound but no picture. Tried several things! Please Help!

You're dealing with a plasma which doesn't have a backlight so the flashlight test won't work. A working plasma display will however glow very slightly when viewed in a dark room. Does yours?

Line across the screen indicates to me a failing buffer which may have shorted and then taken out the Y-sustain. Are there any fuses on the driver boards?

Taking some pictures of the bits would help us highlight boards and indicate tests.

[Bmyers21]

Re: Samsung 50" Plasma- sound but no picture. Tried several things! Please Help!

I will check to see if the tv glows tonight when it gets dark. I will also take some photos when there is no glare. I have replaced the x-main and y-main, as well as the x-buffer and y-buffer. I have swapped the boards in all configurations and it does not make any difference.

Thanks for the help. I will get this stuff ASAP.