Comes on won't stay on

I have a lc-65q7370u it comes on for one sec then off for about 20 sec and repeats this cycle, I have replaced all four boards and it does the same thing do I need a software update to get it to work?

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does the screen actually come on, or is it just the power indicator that lights up for 1 sec.? That kind of symptom would indicate that there is an overload on the power supply and it is shutting down because of it. If you replaced all the boards, there is an unlikely issue of a bad cable or that you got something connected wrong. Otherwise, the only things left are the backlight LEDs or the screen.


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