The prior owner of this Mac SE had installed a SE/30 motherboard in it. When he sold it to me, he was unable to get it to boot past a SimasiMac screen.
I scrubbed the motherboard, removed all the caps, and replaced them with new SMD or axial ones.
I still had some trouble with SimasiMac, but after removing the metal insulator shield, the trouble cleared. I think, after all the cap replacement work, that the motherboard was shorting to that insulator shield. I do see some evidence of rust or corrosion on the plastic liner, and it is bent in several places.
Without the shield, it works great!
https://imgur.com/a/wNfkq
I scrubbed the motherboard, removed all the caps, and replaced them with new SMD or axial ones.
I still had some trouble with SimasiMac, but after removing the metal insulator shield, the trouble cleared. I think, after all the cap replacement work, that the motherboard was shorting to that insulator shield. I do see some evidence of rust or corrosion on the plastic liner, and it is bent in several places.
Without the shield, it works great!
https://imgur.com/a/wNfkq
