First take the back off and look for blown fuses; fuse should be on the circuit board close to where the AC cord attaches.
If that doesn't work, you are to a point where you need a schematic and a voltmeter.
Most all TV's use pulse power supplies today and are difficult to repair.
The power supply will go into shutdown if it detects an overload anywhere in the TV. This makes it look like a power supply problem and it may not be.
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