Question RCA Tv wont stay powered on.

Sep 21, 2020
I have an rca tv led55c55r120q, when i plug it in the power indicator turns on. But when i turn the tv on it will stay on for a few mins then turn off & wont get power again till i unplug it & then plug it back in.
I already replaced the power board but it still does the same thing & idk what to do now.
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