OK, since everyone was so helpful with my Getaway and several people expressed interest in helping me fix my T2, I figured I'd create this thread now before my replacement fuses arrive.
First, some background on my machine. Feel free to skip this section if you just want to hear about the current problems, but there is some potentially relevant info here about prior issues that led up to the major one I have now.
Background:
This T2 is in fairly rough shape. It was in a building that caught fire, and while the machine was untouched, there is a lot of soot on parts of it. Honestly, the machine isn't worth fixing from a financial point of view (the cabinet is rough, the playfield is cracked by the shooter lane), but its the first game I ever played more than a few times so it has some sentimental value. I was also able to acquire it for next to nothing, so other than some money in parts I haven't put too much into it yet.
Despite the overall condition, the game actually played fairly well with no major issues up until a few months ago. The first problem I had was that the game suddenly started failing to boot. It just emitted a periodic clicking noise from the speaker, and the D19 LED on the MPU board never went out. I discovered that if I unplugged the top ribbon cable from the DMD control board, the game would boot up fine (but obviously, the DMD would be dark). I tried replacing the ribbon cables, then replaced the DMD control board, and finally swapped out the entire MPU board.
Swapping the MPU board 'fixed' the problem, and after that the game ran fine again. However, a few weeks later I removed the MPU board and tried swapping the game ROM for a different ROM set, and when I returned the MPU board to the game and hooked everything back up again the boot problem returned . The issue returned in the exact same way: the game wouldn't boot unless the upper left ribbon was removed from the DMD control board.
After the problem returned, I first re-seated the ribbon cables, then tried replacing them with a new set of cables. However, the problem persisted. I then checked the voltages on the power driver board, and I found that the +5v was a bit low (4.875). I decided to try to swap in a new power driver board to see if the problem went away if I cleaned up the power issues. I then swapped in a rottendog power driver board from my getaway (see previous thread for that story). I tested the voltages, and they were all spot on with the new board. However, this did not correct the boot issue, which remained and occurred in exactly the same manner.
If I allowed the game to boot by unplugging the upper left ribbon on the DMD board, the game would immediately reset and start clicking if I plugged the ribbon in while the game was powered on. It would then boot up again properly if I unplugged the ribbon cable again. So, something about plugging the ribbon cable into the DMD board brings the machine down. Also, I tried unplugging the sound board and just connecting the MPU and DMD boards, but the same problem happened.
Current issue:
OK, on to the main event. In an attempt to figure out the issue described above, I began fiddling with the ribbon cables. I removed them, examined them again, and then put them back into the machine. This time, I left the DMD control board disconnected entirely (both the left side ribbons were left unplugged). This is when the 'incident' occurred...
When I turned the power back on, I immediately heard a loud pop from the speakers (I think). I immediately turned the machine back off again (my finger never came off the switch, this happened instantly). I unplugged the machine right away and took a look to see what happened. I discovered the following:
-The F105 fuse on the power driver board blew
-The main 8A line filter fuse blew
I did not observe any further damage, but I also don't know what I'm looking for, so all I can say for sure is that none of the other fuses blew.
Current state of the machine:
Right now, I have the power driver board out of the machine. I haven't replaced the main line filter fuse yet (replacement fuse set coming soon). I have no idea if the machine was damaged beyond the two fuses that I mentioned that blew. Right now my question is, how should I proceed from here? Obviously the fuses that blew need to be replaced, but beyond that, is there anything I should do before I attempt to power this thing back up again?
Also, do you think it is wise to attempt to use the power driver board that was in the machine when the fuses blew, or is it likely that it was damaged in a way that could cause further problems in the machine? I will post some pictures of the original power driver board and the rotten dog that was in the machine when the incident occurred.
PinballManiac40 mentioned in my getaway thread that this sort of thing can happen if the ribbon cables are plugged in shifted over by a row. This makes total sense, since I was fiddling with them just prior to this. What sort of additional damage to the machine is something like this likely to cause?
Thanks in advance!
P.S. On the advice of Haggy38, I have ordered a head lamp so that I won't have any further issues seeing the cabling in the backbox. I will be much more careful with the ribbon cables in the future.