Question PN50A650T1FXZA - Sound but No picture


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.

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

The latest video from AVForums

Star Wars Andor, Woman King, more Star Trek 4K, Rings of Power & the latest TV, movies & 4K releases
Subscribe to our YouTube channel
Support AVForums with Patreon

Top Bottom