GB Ward,
Thank you for your comment! I tested and rejuvenated the tube. It needed a short removed on the red gun. Also, the red and green guns tested weak. Once rejuvenated, they were in the Green for emissions test.
I hooked up the chassis again. The sound you hear when the monitor changes resolution kicked in at startup... then I saw a light blue screen for a moment, then it made that sound going black, then the image appeared, too dim to know what colors were showing. I cranked the flyback with little improvement, but when I turned it down, the image easily disappeared.
I unplugged the monitor and then plugged it back in after at least one minute. There was a spark in the glass neck, which I've seen after rejuvenation. I unplugged the monitor, waited a minute, then plugged back in. The monitor started up without anything out of the ordinary, but I'm back to the green screen again, as it was before (It looks blue in the photos).
It's just odd that the monitor would work great and then not at the exact moment the speakers got near the screen, without moving the cabinet or monitor.. I have a different monitor in the machine that is working fine now, though I still need a monitor to work.
I looked very closely at the neckboard and chassis and don't see anything. I tested continuity all over the place, though I'm sure I didn't test every single trace.
Now, you mention that I should check to make sure the pins beneath the neckboard socket aren't bent. The pins on the CRT are very straight. I know what the inside of a neckboard socket look like, as I had to make my own CR-23 socket for my rejuvenator. Just curious is there is something I overlooked. I tried reflowing solder all over, too, but with no change.
If I hadn't put the cap kit in and had it working just fine for a bit, I wouldn't be so reluctant to send the chassis to Arcade Cup.. well, that and I bought a couple U2000 chassis's from him, one has an issue, and I can't seem to get him to respond.. but that's another story. I don't want to pay the price someone else who has done no work would pay... but who knows how much work he'd have to do to it...
Anyway, I'm at a loss