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Sorry to hear that, does the power indicator lit/ blink when press power button on TV to turn it On?
Do you have multimeter and can check standby volts on power supply board of TV?
Please find attached image of power supply board where connector is marked with yellow arrow, check standby volts on pin-12 of that connector, pins are also marked as 1-2~13-14 to count pin-12 OR get 5V and 12V reading on any pin of that connector while TV power cord is plugged in wall outlet?
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