You have check the power supply first .To know how to check the power supply watch the following video. Normally led tvs power supply contains the led drive circuit too. Bot are integrated in the same board. The led drives circuit should have between 30 to 120 volts from the power section depending up on the brand and model number of the TV. If the the voltage is ok then you have problem with the Led driver section section. Either you can try to repair it or can buy a new power board.
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Testing LCD TV Power Supply BoardsSTEP BY STEP
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