Samsung PS50C685 (EU model) No picture, sound OK problem.

[E8200]

Got a broken TV from a friend. No picture(not glowing either), audio OK. Samsung Plasma TV EU model PS50C685, which is similar to US model PN50C680. Both Y-Main (LJ92-01683A) and Y-buffer (LJ92-01680A) boards at least are same in both models (according to shopjimmy.com). When I measured voltages all connected then Vs and Va both dropped to 0V and Logic board LED blinks on approx. to 5 sec and then off for 1 sec and again 5 sec/1sec... When flat cable is disconnected between Logic and Y-Main boards, voltages are OK and Logic LED blinks normally once in second. Took off Y-Main and there are two 30F123 transistors shorted (Pic. 1). Now my question is, if I replace those transistors or buy new Y-Main, what about Y-Buffer board? How to be sure it is OK or it will blow new Y-Main? Is there any way to make sure about buffer board at home with limited equipment (multimeter) that is it dead or alive? Budget is very limited, otherwise would replace both same time no questions asked. Any suggestions?

Exact Model is:
PS50C685G5SXXE
Panel: S50FH-YB06
Date of Manufacturing March 2011

(Pic. 1)

[smpstech]

Re: Samsung PS50C685 (EU model) No picture, sound OK problem.

Did you get anywhere with this? Replacing the transistors on the Y Board will probably cost you more than a used board and you also don't know what other drivers to the transistors were damaged or stressed. I am having an issue with the same board. Check to make sure the components on the X Sustain are not shorted too.