Cuts off
Most likely the power supply board.
Lie the tv down on a bed and unscrew the back. Its only about 9 screws
around the edge and look at the power board, on the left, see if theres
any burn marks.
I have a brand new board I bought the other day for the same issue but
before I replaced it, stupidly, I checked with LG and turns out mine is
still under warranty so I'm stuck with a new board.
Let me know if you want it. I'll match any price you can find online.
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