mattd1979
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Apr 6, 2014, 6:04 AM
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I have a 40 inch Proscan LCD TV that power cycles with a steady red LED.
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The TV model is Proscan 40LC45S57. What happens when I plug it in is I here a repetitious high pitch wine pulse as the LED stays constant red and you here the speakers popping and the relays inside clicking in sync. I removed the back cover to do a visual inspection to see if there were any blown capacitors or burnt ICs but couldn't tell visually. I decided to go ahead and disconnect the cable that runs from the power board over to the back light inverter. After disconnecting the inverter cable and reconnecting the power cord, I saw a red LED on the power board come on and the red LED on the front of the TV switched off and a blue LED switched on. I then grabbed my flash light and shined it through the back side of the LCD panel and I could see that the "No Signal" message was displaying. So apparently there must either be a short in the inverter board or do you think that maybe the power supply isn't strong enough to supply power to the inverter and that is why it is cycling? I had also noticed that when I turned the TV off there is a high pitch wine coming from what looks like the smaller of the two transformers on the power supply board.
What can I do at this point to determine which board is the problem? Could it have both a bad inverter and a PSU board?
Thanks,
Matt
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