The click is from the power regulator turning on and off. You should always hear the click if that is how it was when you bought the TV. You can check if the TV is still on by seeing how many volts it draws using a Kill-A-Watt meter and matching it up with the specifications listed in the owner's manual. If they do not match, it can either be caused from the power supply board that is faulty or main board that is providing faulty logic to the power supply to turn on or off.
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