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I had the same screen, replacing the 74LS166A fixed it for me too.

Thanks! I'll see. Thought it'd be a problem. Is it okay to test the Macintosh like this, to first fix the flup flup issue, and then fix the flyback? Is the clamp being in half like this dangerous? Any way for an arc to form between the two halves?

Nope, I was busy with other projects.

Nice project! Good job with the design. I'm working on a smaller desktop BlueSCSI which is almost done. It coincidentally uses an ejector-style microSD slot, but it's on the side. Maybe I'll make a new design with the right mounting holes and dimensions, but uses this slot.

Thanks!

Model 157-0026-B I've read through The Dead Mac Scrolls, which indicates the problem does not have to do with the flyback in my case.

Hi all, My Macintosh Plus is making the repeating flup flup sound and not powering on, and upon inspection, the flyback is physically damaged (the metal rod has been corroded in half). I've never seen it working. I recently got a Macintosh Classic with a bad analog board and logic board, I was...