These sets use a magnetic relay to turn on after a while the metal contact pads on the switch burn (just like turn signal flashers in a car)
this causes the relay to click closed but open up again before the TV can start. the relay is on the power supply board it should be labeled RL1 on the board, it is a small black or, brown plastic cube usually located next to the power cord. If all fuses are good this is the problem.
unsolder and, replace the relay.
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