shuts its self right back off and repeats the cycle

I have a 55 inch tcl ruku uhd smart tv and i have tried everything but biying the part that i need cause idk witch part to buy well i can turn it on and it has a picture it says tlc but shuts its self right back off and repeats the cycle i did the restart button ive unpluged it for 20 sec ive held the power button idk what else to do except to find out witch part i need to fix it can anyone help me??

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Can you take the back off the TV and post pictures of the circuit boards? Adding images to an existing question

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@williamch0708 what is the exact model? This looks like your TV does not pass its POST and shuts itself off to protect its integrity. Could be a bad powerboard or bad mainboard but this is a guess for now.

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