Hello folks,
this is a success story about a power supply repair (MagneTek 3231-05-001). Maybe it will help somebody else with the same issue.
Recently my Mac IIsi did not power on anymore. I checked the stand by voltage: 0V, nothing. So I opened the power supply
and saw a broken elektrolyte capacitor (400V 10µF) on the high voltage side. This made me wondering because in most cases the low voltage capacitors spit their insides around. I saw that this capacitor was loaded by the diode beside (one way rectifier). I checked, DC only 100V (in Germany we have 230V AC which makes about 300-320V recitified) but 150V AC. The root cause was the rectifier diode that was conductive in both ways. Changed the diode and the capacitor. Everything fine again.
Regards
Florian
this is a success story about a power supply repair (MagneTek 3231-05-001). Maybe it will help somebody else with the same issue.
Recently my Mac IIsi did not power on anymore. I checked the stand by voltage: 0V, nothing. So I opened the power supply
and saw a broken elektrolyte capacitor (400V 10µF) on the high voltage side. This made me wondering because in most cases the low voltage capacitors spit their insides around. I saw that this capacitor was loaded by the diode beside (one way rectifier). I checked, DC only 100V (in Germany we have 230V AC which makes about 300-320V recitified) but 150V AC. The root cause was the rectifier diode that was conductive in both ways. Changed the diode and the capacitor. Everything fine again.
Regards
Florian