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dp50747 turns on then back off after 20 sec
what is the board marked alarm signal and does that have something to do with my tv turning off by itself
ANSWERS:
Check the manual available here I am not sure if you already checked the power failure circuit. This unit is equipped with a power failure detector function and will turn your unit of to protect from further damage. Good Luck. Also check this post
"Check for bulging capacitors and replace them. My TV had 9 bad capacitors and would not turn on at all after awhile. I replaced the bad ones and resolved the issue.
Total Cost: $17.20"
Depending on the chassis version and whether the TV restarts again after it shuts off that could lead to completely different boards.
You need a new power board about $80 for the part labor is another thing
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