I was able to jumpstart it and get the arpeggio death chime, but then it suddenly switched off. No pop, no burning smell, no magic smoke, simply off. After that, no amount of jumpstarting the first pin of the power supply (white wire) will power the machine on.
I checked and there are no scorch marks on the logic board, and I cleaned and reseated the RAM, ROM, CPU, FPU, and MMU. This is the Rev. A board, so I don't have any electrolytic fluid eating at any traces, and both of the dead batteries aren't bloated at all.
I also checked the power supply and nothing is visibly wrong. The capacitors are reasonably unbloated, the fuses aren't burnt, and the transformers seem ok. I don't have a multimeter at present, so I can't check anything beyond my eyes.
Just wondering if any Mac II experts here can speculate as to whether the power supply up and died, or the logic board. I intend to replace both, but I've only found power supply replacements so far. I'd like to know which you'd recommend I replace first if I hypothetically had access to both.
Thank you in advance.
I checked and there are no scorch marks on the logic board, and I cleaned and reseated the RAM, ROM, CPU, FPU, and MMU. This is the Rev. A board, so I don't have any electrolytic fluid eating at any traces, and both of the dead batteries aren't bloated at all.
I also checked the power supply and nothing is visibly wrong. The capacitors are reasonably unbloated, the fuses aren't burnt, and the transformers seem ok. I don't have a multimeter at present, so I can't check anything beyond my eyes.
Just wondering if any Mac II experts here can speculate as to whether the power supply up and died, or the logic board. I intend to replace both, but I've only found power supply replacements so far. I'd like to know which you'd recommend I replace first if I hypothetically had access to both.
Thank you in advance.