I think you have done the obvious first step (and the only thing I know to suggest).

I hope someone with more knowledge than I have can give you the next step to try.

Is your games GI out? Bad box looks dark. Good to check the GI connectors for burns on J120 J121 on power driver board.

do you have another game you could swap out the A/V board with?
What dose it look like with the ribbon cable un-plugged?

Now I am not familiar with Terminator 2, I did have a Black Rose that had vertical lines on the DMD. I had to get new ribbon cables, which fixed the issue. Maybe try reseating?

I think he did - next step would be to swap dmd boards (if you have another)

swap DMD boards, or replace the RAM chip on yours. Recently had something similar (not exactly the same) on a Fish Tales. RAM fixed it.

Reseat this ribbon cable at all 3 board connections T2 not having the fliptronix board).Ribbon cable reseating (resized).jpg

It could take 2 or 3 reseats before it acts correct.

I recall that in some cases when I was reseating the cable I was not pushing the connector all of the way down. Obviously, you have to be careful not to push too hard, but just something to consider.

aww too bad someone close to you or yourself does not have another dmd to try or dmd controller board. I bet its the ram on the dmd controller board. If your not going to repair it swap the controller first.
Seen that lots. Same as bad caps but that usually causes rolling. Cables are number 1 and as you tried reseating them along with replacing them so we can rule them out.
Little tip......make sure your dmd controller is 100 percent before plugging in your new display!
no sense potentially hurting a new display..
Good luck and cheers

In future, if you see display issues like this, run a display test from the test menu. This will test the integrated circuits on the display controller board and will report any issues. This looks like a simple video RAM issue and could have been as simple as a $1 integrated circuit replacement. The burned section on the rear of the board was probably not related as high voltage problems usually effect the entire display rather than specific vertical segments.

This is exactly why I suggested replacing the boards as opposed to using the test menu because once display issues get bad its tough if not impossible to read . Good on you for fixing it. Color dmd's are amazing.

As mentioned above...Your original controller merely needs a ram replacement and a 7 - 10 dollar high voltage rebuild and its good to go. Some dmd's make noise with certain power supplies. If you rebuilt the original I bet it would be much quieter.
Time to play. You'll be back! Sorry had to say it.

as for your Ball / switch issue check the switch test and see what does or does not work. Use the ball to test switches as your finger is inaccurate. You will find your problem in moments. As mentioned above the internal software and tests are your friend and should be your go to when you have a problem.
Let me know what u find.
Cheers