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Hello, If there are no signs of life on the set at all- then the power supply board has failed and needs to be replaced. This board generates all of the DC voltages in the set and also the power light on the set. The board will appear perfectly the same whether good or bad- so nothing visual will tell you that the board is bad. It can be purchased at the set below for around $55 if you'd like to repair the TV yourself:
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