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Honestly I think that looks really good!  I guess it makes sense for those discolored internal plastics!

I just wonder how much all of those ram chips originally cost.  It would NOT have been cheap I bet!  It's also neat that the Lisa video circuitry is similar enough that it doesn't need much of an adapter to work.

Interestingly I think I got an adapter like this to work with my Centris 650 with just a 2N3906 as the only part.  No resistors.  This was quite a while ago though so I may be totally wrong.

I would check for continuity between a key in that column and one in that row with a multimeter.  That might rule out having a bad input on the keyboard microcontroller.

Not sure if this is needed information, but ZTerm doesn't seem to work on Catalina cause it isn't 64 Bit.

I *think* you can reset the battery chip with these OF commands: reset-nvram set-defaults reset-all Don't quote me on that though.

I would be careful, I've killed many of the little BMSes by reconnecting the cell wires in the wrong order.  Not shorting anything, just in the wrong order.  Something about it they don't like, and I'm not really sure what it was.

This driver might work: https://support.hp.com/us-en/drivers/selfservice/swdetails/hp-laserjet-4000-printer-series/25474/swItemId/lj-5646-7 I doubt it will work without.

I bet that name is Ray not Rog.  Hopefully they wound up together!

I just looked it up, and breaking current appears to be the current that you can run through the fuse without it physically exploding.  It should be higher than the fuse's current rating to pop.

The only part that might hurt the CRT is if you pull sideways on the neck board while removing it.  As long as you pull straight back, it should be fine. I would look up some pictures of a flyback clip to see how they come off though. Yep!  That probably was me on reddit!

Even if they don't look bad and you've cleaned up the cap goo, that doesn't make them any better.  You should do a recap of at least the logic board.

Was the transistor you replaced the HOT?

Logic boards? Yes, they are.  All Classic and Classic II logic boards are interchangeable.

I can't answer most of the questions, but you might have a cracked solder joint somewhere that's making bad contact.  I think it's the yoke connector on the Plus AB that normally has these problems.  Also, I'm not sure running the AB without a CRT connected is a good idea.  you have an exposed...

As someone said, try plugging in headphones.  If the switch in the jack is stuck that might help, even though it's probably a corroded chip like bibilit says.  If the headphone sound does work, try spraying contact cleaner in it and unplug and replug the cable a few times.

You might try bending the contacts in the keyboard connector to see if you can get them to make tighter contact.

Thanks!

Almost seems like it's hanging while reading the ROM.  Bad contact in the ram sockets? Maybe bad sound chips?

Huh, strange.  Could you take some High Res photos and attach them?