Hello to all you great people trying to help others. I don't know if this is the spot to post a question but here goes. i have an lg 50pq60 that when you press the on button goes immediately into power cycling. i have tested the PS and all is well even AC_DET is perfect 5v. I then disconnected the y-sus connector and the relay on the PS clicks once and all voltages are within range from the PS output terminals. I found a blown fuse on the y-sus board which was the one circled in green and temporarily repaired. Same problem as the start though. If I dissconnect the y-sus from the buffer the same relay cycling occurs. Also with the x-sus board disconnected too. But when i disconnect the connector circled in blue, with all the others connected the y-sus board energizes and emits a buzzing sound and begins to get hot in the areas circled in red. Which leads me to believe the y-sus board has a short. Oddly enough when i unplug the connector circled black, with everything else plugged in, the relay clicks once on power up but there is no heat or noise from any board? No picture at all during all tests.I would appreciate it greatly if someone could focus my energy on the right board to fix. I am thinking all is bad with y-sus board and it is causing all the problems. I am skilled but new to TV repair and wish to further my skills and not slap a FRU into it and hope for the best. I thank all for the vast amount of literature this site contains! It is a valuable resource to all who wish to understand things and learn to fix things again.
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