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The tv power supply board it is shorted and dead.That the board where the tv power a/c cord plug into it.Tries websites like Shojimmy.com,Ebay.com to buy a whole new refurbish tv power supply board for the replacement.
You will either have a fault with the inverter board which drives the backlights or a faulty backlight in the screen. If the problem is a backlight then a replacement screen is the only cure. One or the other is breaking down after it has been opn for a certain period of time, have an engineer call out & check with a tester if it is a screen problem.
do you have heater voltage because if you are hearing high voltage you may need to replace a resistor and capacitor in the 200v circuit or you could possibly have a anode not seated right arcing on somthing or a bad flyback