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Old 09-27-2021, 02:57 PM   #1
meeotch
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Join Date: Aug 2021
City & State: new york
My Country: USA
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Default Samsung PN64H5000 clicking when powered, then stuck in standby

My PN64H5000 shut itself off/on/off a few times in succession last night, then refused to turn on again. When I first plug it in, I get five clicks coming from the power board, and the red standby light on the front goes on and off, as does the little green LED on the logic board. After that, the red standby light comes on after a couple of seconds and stays lit, but the TV will not power on. Confirmed by leaving it unplugged overnight.

I opened it up, and didn't see any bulging caps, burnt PCBs, or anything else obvious. Tested the two fuses I saw on the power board (one removable, one in a holder that wouldn't allow removal without bending the ends), and they have continuity. I measured the voltages at the power->main connector, with the cable removed, and everything was in the mV range, rather than the correct values printed next to the connector.

With the main board detached from the power board, no clicking occurs when plugged in.

Note: prior to this, the TV was suffering from a magenta flickering problem: https://www.badcaps.net/forum/showthread.php?t=98223

I did search for the clicking/power issue, and found several threads, with different solutions involving various components. I'm good with some light soldering... but for the time/money tradeoff, I'd probably just replace the boards, rather than spending forever swapping components out one at a time. (Or give up altogether, if the combination of the two problems seems to indicate that the panel is going bad anyway.)

Are there some easy tests I can perform to determine the best course of action?
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