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Hello, If there's no life to the TV whatsoever, and you've already left unplugged for a couple of weeks, then at the least you have a blown primary fuse inside of the TV- and at worst a bad power supply board in most cases.
Given this, you will need to remove the back of the TV to fix the issue- which entails checking the fuse using a meter, and if the fuse tests good then replacing the power board.
If you want to do this yourself, every screw on the back of the TV must be removed and the rear cover taken off. If you don't have a meter and cannot test the fuse (the fuse is white ceramic and soldered in place right next to the AC inlet on the power supply board), then the easiest approach is going to be to simply swap out the power supply board. This part can be purchased at the link below for $40 for your set:
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