Check the power supply output there should be 5 volts on the output this turns on the main board if there is no 5 volts then the power supply is at fault also look for open capacitors on the power supply this can also be a major problem causing the tv to not power up
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Check the power supply output there should be 5 volts on the output this turns on the main board if there is no 5 volts then the power supply is at fault also look for open capacitors on the power supply this can also be a major problem causing the tv to not power up