Guest dani9678 Posted April 5, 2014 Report Share Posted April 5, 2014 The TV model is proscan 40LC45S57. What happens when I plug it in, I here a repetitious high pitch wine pulse as the LED stays 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 I plugged it back in I saw a red LED on the power board come on and the LED on the front of the TV switched from red to blue. I then took my flash light and shined it through the back side and then 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 also notice that when I turn the TV off that there is a high pitch wine coming from what looks like the smaller of the two transformers on the power supply board.What should I do at this point? Could it have both a bad inverter and a PSU board?Thanks,Matt Quote Link to comment Share on other sites More sharing options...
Guest hetztronics Posted April 22, 2014 Report Share Posted April 22, 2014 HELLO THERE MY SUGGESTION IS CHECK/CHANGE THE INVERTER BOARD THAT IS MOST LIKELY GET DAMAGED Quote Link to comment Share on other sites More sharing options...
Guest atlanticav Posted May 10, 2014 Report Share Posted May 10, 2014 Not sure if you have repaired your tv yet or not but most of the time if the transformer on the power supply is making a noise then its the power supply bad. Good luck and let us know the outcome. Quote Link to comment Share on other sites More sharing options...
Guest swarner11 Posted June 11, 2014 Report Share Posted June 11, 2014 Yes, I think this is due to the badness of power supply. Please check it properly. Thanks Quote Link to comment Share on other sites More sharing options...
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