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Answered in 5 minutes by:
7/17/2018
VerifiedHello and welcome to Just Answer, an independent paid-support site. My name is ***** ***** I'll be advising you today. If you've replaced the power supply board, and it's behaving like that... my suspicion is the main logic board is fried. The power supply board is powering up, sending power to the main board but isn't receiving a response (so to speak) so it's powering back down.
The main boards for these are pretty scarce so expect to pay $200+ for them
Here's the service manual for the TV : https://www.manualslib.com/manual/917096/Sharp-Lc-60e77un.html#product-Aquos%20LC-65E77UM
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