I got this Chieftec (actually Enhance) power supply. It was never used but had broken fan so I swapped it for NMB.
I also preemptively changed all caps since these craps used are known to die within weeks in Chieftec PSU's. It had lower voltage on 12V rail than it could so I played with one potentiometer little bit and increased the voltage from ~11,7 to ~12,2 V. It was all fine, at least with no load, I am not sure whether I actually tried to power some board with it or not, it's more than week ago.
But now I tried the Intel D865 PERL I wrote about in other thread. Everything powers up but after some time the PSU starts whistling terribly and later it shuts down automatically. All voltages are still within their values up to that moment. I tried different setups to see if it's not cross-loaded, but still the same result. There is another pot I am not exactly sure for what purpose, tried to play with it for a while but no result.
I used Samxon RS, Chemi-Con KY and Nichicon PW caps. I tried to keep original values this time, only instead one 0,47 uF cap I used some old 1uF Rubycon or what taken from old display (but I think it has lower capacity after the years). And as always I used only 3300uF caps on main rails even if there were lower ones (1500 or 2200 uF typically). Tried even to blow inside with 12cm fan for the case it was overheating (heatsinks are arround 40-50 °C) but still the same behaviour. Any idea what's wrong?
I also preemptively changed all caps since these craps used are known to die within weeks in Chieftec PSU's. It had lower voltage on 12V rail than it could so I played with one potentiometer little bit and increased the voltage from ~11,7 to ~12,2 V. It was all fine, at least with no load, I am not sure whether I actually tried to power some board with it or not, it's more than week ago.
But now I tried the Intel D865 PERL I wrote about in other thread. Everything powers up but after some time the PSU starts whistling terribly and later it shuts down automatically. All voltages are still within their values up to that moment. I tried different setups to see if it's not cross-loaded, but still the same result. There is another pot I am not exactly sure for what purpose, tried to play with it for a while but no result.
I used Samxon RS, Chemi-Con KY and Nichicon PW caps. I tried to keep original values this time, only instead one 0,47 uF cap I used some old 1uF Rubycon or what taken from old display (but I think it has lower capacity after the years). And as always I used only 3300uF caps on main rails even if there were lower ones (1500 or 2200 uF typically). Tried even to blow inside with 12cm fan for the case it was overheating (heatsinks are arround 40-50 °C) but still the same behaviour. Any idea what's wrong?
Half of the computer problems is caused by bad contacts 
Also the PSU starts only when one VR is on it's end now. This is probably the important one 
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