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Can I use a Performa 578 logic board for the mystic upgrade? Every article refers to LC575 but the technical specs look the same to me. Is there a difference or functional limitation to using a 578 board? Thx.

I had the exact same issue a few years ago. I had a bad trace between UE8 pin 3 to UC7 pin 3. Here's a pic of the bodge, no more jail bars. Maybe your issue is the same line.

Perhaps you already tried this, but I've had this error on 2 SE's and it was the low ROM that was bad. Chip 0353-A. Have you swapped that one out with a known good one?

Happy to find this thread, I have a Mac Plus with similar issues. I'm getting roughly 50-60% normal voltage on the 5v and 12v. I replaced the fly back and now have raster, patterns on the screen but no bong or boot. I see a new 4N35 at U3 might help, specs for 4N35 say it has 3.55kv output...

I have a Mac Plus which appears to have a dead flyback. Can I source one from a SE/30 analog parts board? Are specs the same, are they interchangeable?

A lot of the recent BlueSCSI threads got deleted, so I've been unable to find an answer to this problem. My Mac recognizes the BlueSCSI when it's hooked up with an external SCSI2SD and both of the termination jumpers are removed, so I know the device is working. However, when I try to boot the...