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I do actually, I have a (12 watt) Tensor lamp that takes those bulbs. I don't know how I'd go about safely connecting it to the logic board, though. Might need thicker wires than the little bodge ones I have.

Nothing at all (multimeter doesn't react) on +12 or -12. Also, the exact measurement I took over 5v was 302ohms, and is now 297ohms on the remeasure Not sure it makes a difference but if we're talking on the factor of only a couple ohms it might be worth pointing out.

You're right, there is 300ohms of resistance on the 5v rail (both of them, FWIW). I'll start trying to figure out what that means, and where it goes.

Forgot to check the -12v rail. It shows ~-11.48v without the LB plugged in, and between -9 and -11.48 with it.

All right. Without the logic board in place, the +12v rail provides a consistent 11.48v and the +5v provides 4.95. I assume that's pretty low. When I plug the logic board in, the 12v rail jumps up and down between 1v and 11v, and the 5v rail jumps between 0.05 and 1.95. So I take it I should...

Haha, got a bit ahead of you. I did try to power it on without the caps, as I read somewhere that it was actually possible. Nothing changed, it still cycles as it did before. Also, I meant to say pinout as opposed to schematic, since I found that schematic you linked and thought it to be a...

Ok, took all the caps off and took another look. I didn't see any bridges, and double checked all my trace repairs for continuity and making sure they didn't bridge with neighboring traces. Updated pics in case anyone sees anything, as well as up-close pics of the wrecked sound chip. Believe it...

Yeah, I haven't got the most experience, or the best soldering iron. I'll check the tantulums but when I installed them I didn't see any bridges.

Damn. Alright, I'll keep that in mind. Would you mind linking a good source for how to safely discharge the CRT and which caps on the LB I need to discharge? In the meantime, here are the pics of the logic board. This is after a scrub with vinegar and a toothbrush, an ultrasonic cleaning (a...

I'm working on a Macintosh Classic which has unfortunately seen the bad side of a clock battery. The damage didn't seem to be too terrible to me, but I replaced all the caps on the logic board (have not touched the analog board, and don't intend to if I don't have to). I've also repaired a few...