My LG plasma TV 60PK540-UE turning off by itself

My LG plasma TV 60PK540-UE turning off by itself

Looking for help please. My LG plasma tv(60PK540-UE) will turn on but after about 20 to 30 min will shut off. You can turn it back on but it eventually get to the point where when you hit the power button, itll click and turn on then shortly after(couple seconds, itll click again and turn off. Could it be the power supply? Any help is appreciated. Thank you.

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