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Samsung plasma ps50c96hd picture problem, flat color, no uniform color, blur

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chris333j:
Hi, I have a plama samsung (ps50c96hd) and the picture is very bad.
I'm new in this forum so i edit this post, sorry for that...
The picture :


With no signal there are grey point :


I have control all the voltage (Vs, Vsc, Va, Ve...) all is good.

On the Z card (on right) i just replace a bad capacitor (25v 680mf) but no effect.

I have change the t-con module but no effect...

If you can help me plz  :03: :03: :03:

chris333j:
I have change the t-con (control) and the power-card but no effect.
The problem :
https://youtu.be/GxG9rA_kXFw
Thanks a lot for any idea...

downunder:

Fairly certain you have a faulty X-main board, based on the murky swirling background to the picture. Ohms check all the FETs etc attached to heatsinks on the x-main in case one is shorted.                          Bruce

chris333j:
thanks for your answer Downunder.
Could I check the FETs directly on the card or must he desoldering ?

downunder:

Just check them in situ. If you get an unusually low reading, then maybe remove, or snip two of the legs, to recheck. If ok, then you should be able to resolder the severed legs.

I'll upload the service manual to the forum. Page 4-14 seems relevant.

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