No standby red light, nothing
This Sony has a separate AC->DC power adapter supplying 19.5V to the TV power board (JK3)



Disconnected JK3 power board from main board, checked voltages on all the pin outs

At a few pins I can see the power supply providing 19.5V to the main board



Based on the service manual triage.. it seems to be pointing towards the power board (JK3) being the most possible culprit


LED light turns on when I disconnect LED driver board ribbon from mainboard (so i thought it is the mainboard,...

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hello all this community is awesome and i'm glad to be a part of it!