Most likely has bad capacitors on the power supply, but there is a troubleshooting process one can do with the back open to isolate the bad board. You can open the TV and look for swollen caps.
Boards cost about $100 each so its important to guess correctly
Thanks
Roety
I’m happy to help further over the phone at
https://www.6ya.com/expert/eric_ab7c09ec01841771
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