I have a PC Power & Cooling Silencer 400W ATX PSU that I am attempting to repair.
I have replaced every electrolytic cap in the thing with mostly Panasonic FC capacitors, I used Nichicon HE for the two 1000uF 6.3V caps and Nichicon LS for the two 1000uF 200V big caps.
Yesterday, I re-assembled it and tried it out. The voltage seems to fluctuate with a periodic regularity. On the 5V side it dips down to 4.8V and then comes back up to 5V. And, on the 12V side it dips to 11.8V and climbs back up to 12V. It does this at a pace that is slightly faster than once per second. As an additional observation, I hear a faint click that occurs at about the same pace, slightly faster than once per second. This noise is not coming from the fan, but I haven't been able to locate its origin.
I know that the voltage dips are within the normally acceptable 10% range, but I am concerned because every other PC Power & Cooling supply I have has always had rock solid stability at the voltages it supplies.
I don't know where to go from here. Any thoughts or suggestions? Do you think this supply is repairable, or should I just desolder the caps and other parts and just chalk this one up as a loss?
Thanks,
Justin
I have replaced every electrolytic cap in the thing with mostly Panasonic FC capacitors, I used Nichicon HE for the two 1000uF 6.3V caps and Nichicon LS for the two 1000uF 200V big caps.
Yesterday, I re-assembled it and tried it out. The voltage seems to fluctuate with a periodic regularity. On the 5V side it dips down to 4.8V and then comes back up to 5V. And, on the 12V side it dips to 11.8V and climbs back up to 12V. It does this at a pace that is slightly faster than once per second. As an additional observation, I hear a faint click that occurs at about the same pace, slightly faster than once per second. This noise is not coming from the fan, but I haven't been able to locate its origin.
I know that the voltage dips are within the normally acceptable 10% range, but I am concerned because every other PC Power & Cooling supply I have has always had rock solid stability at the voltages it supplies.
I don't know where to go from here. Any thoughts or suggestions? Do you think this supply is repairable, or should I just desolder the caps and other parts and just chalk this one up as a loss?
Thanks,
Justin
Comment