Capacitor in power supply The Big one check voltage, Capacitor voltage on mine was 99 volts. After replace with larger one, voltage 150. Cap was dried out. This caused the mosfet transistor to run way to HOT causing shutdown,,,. Smile I think they built the psu with the wrong Cap. Mine was 400 volts. I could not see any PFC circuit. I replaced the 400 volt 120 mf with a 250 volt 200 mf. Tv works fine. Mosfet is cold now. If you have a heating mosfet check voltage at the cap. Mine was 99 volts. New cap was 150 volts. Good to know.