The DMD has been working fine with absolutely no issues since I got this Street Fighter II pin a few weeks ago. Then yesterday I had the playfield up for service and, long story short, when I turned it back on everything worked except the DMD. Then I made sure everything was still connected, checked under the playfield, and I didn't see any issues. I turned it back on again and voila the DMD was back up and running again! I played a few games just to be sure, and everything worked.
Then, I carefully resumed my LED bulb swapping that I had been doing previously. However, when I turned it back on again, the DMD was dead - again. And now nothing I do brings it back.
My first reaction is to check the F3 and F4 display fuses. But the fact that it stopped working, then started working again for a while, and then stopped working for good makes me wonder if it's fuse-related. If it was fuse related, wouldn't the fuse(s) just have blown completely and it would have just stopped once and for all until I replaced the fuse? Thanks for any insight a noob like me can get on this!