Why does TV power on and off suddenly?
At first it would power on and would work for an hour. Then it would begin the on and off continuous cycle. I’ve done some troubleshooting, but now once its plugged in, the on and off cycling begins?
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@nellzbear you will need to let us know exactly what you have done. Power cycling is actually an On-off-on cycle which would be indicative off a bad MOSFETs on the main board. Turning on and then off is most commonly related to either a bad power board or a failure of a board to initiate. Remove the back cover from your TV and visually inspect your boards for any damaged looking components. Post some pictures of all of your boards with your question. iFixitでの質問に画像を追加する方法
Also, make sure you unplug everything from your TV. Things like sound bar, cable box, Firestick etc. then unplug the TV and hold down the power button for about a minute. After that connect one local video input source (DVD player etc.) and see if that has changed the TV’s behaviour
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