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Probably there is either a short circuit that causes the TV to shut down or re-start... or some other problem.
I would advise you - if you have some electronics skills and skills with the use of a volt meter - to obtain a service manual for this model or model line, so as to guide you in finding the actual problem. It might cost a little, but could save you quite a lot in tried-replacement-boards costs.
I need to ask: Was there, or is there now, a 'flash code' when you first power On the TV? if so, note it down (e.g. 'blue light flashes 5 times' or similarly) and let me know what it is. That can be an important indicator as to what is going on, or what is going wrong, in the TV.
Or a fault with regard to the power circuitry feeding that section, or... most likely perhaps... a short circuit in that branch of the power circuit. Check for that, I advise.