Question about Televison & Video
I have a Legend 42'' LCD 1080P HDTV (LEC-4227) that will not turn on.
Here are the symptoms:
I can turn the TV on with the remote control or TV power button, but there is no picture or sound at all - the screen is completely dark. The power LED changes color which is the only sign of life.
After I turn the TV on, it cannot be turned off using either the remote control or power button on the TV.
I am not the original owner, and from what the previous owner tells me, they had a problem with a black box rectangle ''menu'' popping up over top of the picture sporadically in the months leading up to the no-audio/video problem.
I temporarily disconnected power wires to some of the internal components like buffer boards, etc to isolate the problem but it seems that the problem exists even though I only have the power supply and the ''logic'' board (a main circuit board more or less in the middle of the TV). I can only assume that the problem is in the power supply board or the ''logic'' board, but I don't know how to proceed.
Please help me and the others with this problem.
I am NOT interested in answers like ''take it to a shop'' or ''buy a new TV''. I would like to hear from someone who can tell me what board is the problem, and possibly how to troubleshoot at the component-level.
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Posted on Jan 02, 2017
Tips for a great answer:
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SYMPTOM: Won't turn on or intermittently won't turn on, Red LED Flashes.
CAUSE: Loss of Main Switched Power Sources. Standby power is OK.
SOLUTION: Replace Regulator IC Q820 with Toshiba Part # 23135094
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