PC Power Supply Problem
Few days ago my personal pc DELL Inspiron 530S developed a problem- it was an intermittent problem. The pc will beep and the fan will turn unusually fast. Sometimes it can be turned on with no problem. I suspected that the power supply have problem because if the fan turn very fast that means there was an overvoltage. I believe if i continue to let the pc to run, those e-caps in the motherboard will bulge because of overvoltage. I took out the power supply and vacuum it and check to see there was no dry joints in it. Guess what i found? I found tiny cracks on some pins in the coil at the secondary side. After resoldered the dry joints i used my ESR meter to scan just to check if there was any bad e-caps.
I found a 47uf 25 volt ESR value had doubled than the original value. I’m not sure whether the e-cap have any big effect on the pc but for maintenance wise, i just replaced it. If i did not replace the e-cap, may be after few months later, when the ESR value shoot up to very high, it may cause a serious problem to the power supply. After the replacement of the e-cap and with fresh solder applied, the pc now worked like a charm. It is good to be electronic repairer-you can repair your own electronic equipment!