Question PN50A650T1FXZA - Sound but No picture

caseysam

Novice Member
I have sound but no picture. All fuses good.

Power Supply - VA and VS voltages good
YMain - VSC Voltage bouncing around
XMain - VB Voltage bouncing around

If ribbon cable from Ymain to logic board disconnected, Ymain voltages good.
If ribbon cable from Xmain to logic board disconnected, Xmain voltages good.
If both Y & X ribbon cables to logic board disconnected, all voltages good.

Tried to get test patterns to come up on screen.
Shorted PS_On & Ground on power cable from Power Supply to Main.
Placed jumper on pins 3 & 4 on Logic Board.
Disconnected video cable from Main to Logic.
NOTHING!

Suspect logic board. Request any comments that may help. Thanks.
 
Last edited:

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