Hi. Its been a while since I posted and I just want to say thanks for having me! I have a Sharp LC-32SB28UT A LCD TV that will not power on. It has 2 fuses, apparently one for neutral and one for line voltage. The are good. The control board, with the power button, has 3 wires that connect into the A/V board. Any thoughts on what this could be? Thanks!
Only vague guesses until some testing is done. Is the standby supply running and is the microprocessor getting the power on command from the control panel? It is usually a 3.3 or 5 volt line that goes high or low when to power button is pressed.
Sorry for the delay. From my power button board, I have 3 wires Red, Brown and black, R to BL is 2.02V. This is unaffected by power button presses. R to BR is 2.02v to 0.0v on the power button presses. It seems like the signal from that goes to the AV board then turns on the PSU then the TV comes on. I have checked the PSU in some places and it seems to be waiting. Think I may need a AV board?