Re: Bad Y-main and Y-buffers on a PS50Q97HD

Anybody who know what voltages I should find on the connectors to the Y-buffers?

Re: Samsung PS50Q91HD sound but no picture.

I'll continue my repair [url=https://www.badcaps.net/forum/showthread.php?p=382605]HERE[/url].
Sorry for hijacking your thread.Re: Samsung PS50Q91HD sound but no picture.

I'll continue my repair [url=https://www.badcaps.net/forum/showthread.php?p=382605]HERE[/url].
Sorry for hijacking your thread.Re: Samsung PS50Q91HD sound but no picture.

I'll continue my repair [url=https://www.badcaps.net/forum/showthread.php?p=382605]HERE[/url].
Sorry for hijacking your thread.

I don't want to hijack rowage's thread so I start my own.

A friend gave me a PS50Q97HD that quit working with a "bang and smoke".

Opened it up and directly saw a blown Y-buffer chip.
Measured the FET's on the Y-main and one was shorted and i replaced it.
One cap was also bad and is now also replaced. (se attached picture)

I desoldered the bad Y-buffer chip and tested the tv with just the lower Y-buffer in place. (didn't know that the image bus was delivered through the upper board at that point)
The panel lighted up...

Re: Samsung PS50Q91HD sound but no picture.

Thank you Tom!
I have good electronics knowledge, but never worked on plasma displays earlier. (working as a electronic engineer)

Should the Y-main board have the LED off if everything is fine even with the Y-buffers unplugged?
Most of the buffers on the Y-buffer has shorted out, waiting for new 3407F chips. But want to make sure the Y-main is okay before I blow up the new buffer IC´s.

Any good tips of things to measure to make sure the Y-main is okay? (I have replaced one bad cap (C5709) and one...

Re: Samsung PS50Q91HD sound but no picture.

My white power-led on the front of the TV is also blinking 6 times.

Re: Samsung PS50Q91HD sound but no picture.

I am also trying to repair a PS50Q91HD and I also have the green LED shining on the Y-sustain board.
How should it react with a okay Y-sustain board but unplugged Y-buffer boards? Should it be on or off?