I've fixed a few of these TVs in the 55 and 65" models with same problem. Seems the buffer board from the panel gets shorted out to the frame somehow. I removed the buffer board and put electrical tape where
the buffer boards contact any metal and problem fixed.
be careful not to rip/ tear one of the cofs.
Hope you have the same problem so it's an easy fix.
good luck, let's us know
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