Samsung LED TV power cycle issues

My Samsung LED SMART TV started recycling al of sudden. As soon as I turn it on it starts booting and it would turn off. I don't hear any clicking noise.

When I opened the TV nothing looks out of place. I reset the power to switch below the TV that is also used for remote infrared, by removing the wire from motherboard. TV started working fine. 2 days later same problem again. This time again I disconnected the power cable from power board to motherboard and once again everything back to normal.

Obviously unscrewing TV and unplugging those wires is not feasible solution. I'm confused what is broken here. Is it power supply board or the power switch?

TV mode number UN46EH5300XZA.


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What I see techs do.

They swap in one then the other. Given the cost of tech time they may not swap in the old board if it took 2. Boards are cheaper than the repair hours. This can really upset folk used to the days where techs tried hard to find which part it was.

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Power recycle

Are you saying swap both power board and the small circuit board for power button? What if the motherboard is the problem?

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Then you swap that too.

One of the big misunderstandings outside of TV tech repair circles is that in the depot they just swap boards after a guess. Spending time is far too expensive and for reasons that would take too long to write there is rarely any BIT (built in test.) So you as the tech make your best guess and swap. For Garage repairs this can really irk those guys.

There is some old wisdom from my old tech friends. Ready?

"When in doubt what part it is,
replace the cheapest part first."

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