Quote from: hZti on March 22, 2023, 05:05:39 PM

Sounds like the PSU overheats and triggers some kind of protection. You can check if it is full of dust or the fan runs to slow. The issue with the very loud PSU is a general issue with the standard PSU and can be solved with aftermarket Computer PSUs. If you open up the PSU be careful, it contains power even if not plugged in!

Thanks, I had already cleaned the PSU before it failed and it is still clean.

What ever made it fail (10VDC instead of 12vDC) did not revert by just cooling down again, it was still broken hours or days after the drop to 10V.
But then after weeks in the 'naughty box', when I decided to investigate, it was making 12VDC again.

I have since then powered the miner (with only 2 instead of 3 hashboards) for a day or so with the dodgy PSU and it has continued to function as it should.
Interestingly, I cannot detect a difference in efficiency (measured at the wall) between using the beat-up and noisy old PSU and my almost brand new 2050W PSU, except that the new one is practically silent.

The old PSU is back in the 'naughty box' for being too loud (but I am quite certain that the noise level is the same as when it was new. The noise would not matter if the miner was operating by using it's stock fans, but the miner is now very quiet due to the Phresh 8" 240V fan).