I have a Macintosh Classic (analog board 630-0560 220V), I have already replaced all the electrolytic capacitors that were leaky, and now I get perfect voltages on both 5V and 12V rails. I've recapped also the logic board. The Mac works just fine, but only with a power cord without the ground pin. If I use a regular 3 pins power cord, the machine shows the checkerboard pattern on screen and after a minute or so it boots (with a "shaky" image) and after another minute the image stabilises and it works just fine.
I suspect that it's somehow related to a capacitor, and I'm thinking about the 2 RIFA security capacitors (RIFA PME290MB Y 10n). I'm not an expert in electronics, so maybe I'm totally wrong here..
I suspect that it's somehow related to a capacitor, and I'm thinking about the 2 RIFA security capacitors (RIFA PME290MB Y 10n). I'm not an expert in electronics, so maybe I'm totally wrong here..