Great! Thank you for the help. I'm going to order the parts and boards today for the 1.5 version. I suspect I'll end up with extras, although I need more than one (for other projects).
My machine's floppy drive literally lost its magic smoke today so I'm really with no way to boot my Mac.
I just cloned the repo and I'll see what I can figure out while waiting for access for to the hardware.
Quite happy with the results, I kept the cover off to compare. Used 64oz of 3% peroxide, few table spoons of oxy, in a clear plastic storage bin, with a few landscaping rocks to take up volume inside and the rest filled with water. No streaking at - the slight variation on the picture is just water I wiped away before taking the pic.
Front, keyboard, and back panel are in waiting for the sun tomorrow.
In the stack of Ti machines there was another 1Ghz that booted and had sound, but was in a really cosmetically bad case. Read up on the R&R, and it didn't look bad, so I swapped the logic board from the machine with sound to the machine with no sound.
Everything works, except the sound! Machine acts like it did before- volume keys show volume up/down, sound control panel works. No sound out of the headphone jack or speakers.
I guess the next step is to put the pulled logic board into the cosmetically bad chassis, and see if it starts to work there. I should also figure out how/where the speakers are connected, I guess, and see if there's some kind of short.
The most I get is, upon powering, is that most pins have a +2V rise with power applied that does not change. Pin 1 has +5V deflection that does not change, either. There is certainly no rise in signal from pin 15 after a second or so, or any time after, just the +2V when the machine starts. In essence, I suppose this thing really is toast! I verified vs. the EGRET on my LCII to make sure I had the correct readings and, sure enough, Pin 15 behaves just as you stated with a voltage jump.