Good day. I have a few of these power supplies for repair. I have checked it according to the Chinese manuals but still, I am not getting them to work.
The two outside fans on the power supplies are not starting. The center one is working. I do not get any shorts on the MOSFETs or the rectifiers. It seems to be a feedback or a control issue but I do not know what IC's can cause this.
This part of the circuit seems to have the fault. The R390 resistor tends to pop.
If you have any information on this fault, please drop a comment.
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