Cornboats
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May 25, 2014, 5:22 PM
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LG42-powers up with sound but no picture
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LG42PQ3000. Standby red to blue. Screen channel identification- full screen for a few milliseconds then Ysus and z sus voltages drop.
Ysus- -vy from -175v down to 3v
z sus 80v down to 50v
VS, Va and 5v remain.
When I disconnect supply from y sus to z sus Ysus voltages remain up.
When I disconnect Y drive Ysus and z sus voltages remain up.
I thought it could be the Y drive board but I've had 2 boards from different suppliers
with no difference to the outcome. Does anyone know the best way to check the Y drive board in case I've been sold duff boards?
I'm loosing my patience with this one so any help or advice please.
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