Quoted from wamonkey:
I do have a color DMD and upgraded speakers etc so it did max out the 12 volt so even after swapping to a new rottendog board it still blew the fuse and I noticed the cannon got slow. Once I made my power supply and took off the pinstadium lights everything went back to normal.
Before I had pinstadium I never noticed the slower cannons and somewhat weak flippers but with the new rottendog board and pinstadium on the service outlet the game plays like new. I plan on fixing my old board - as other firms write weak bridge rectifiers are the culprit.
I just think STTNG is just a game with so much going on it’s always going to need an external power supply- it will for sure with a color dmd and pinstadium.
I think as long as you have a solid 12V (I rebuilt mine a while ago), no other mods besides ColorDMD and don't crank the brightness up above ~40% you'll be alright. Or at least that's worked on mine so far and last night I moved the flasher trigger to one in the Borg ship which keeps it on a LONG time during Borg MB and that didn't blow the fuse of make the cannons or flippers weak. I thought it would turn off after the initial start of MB but I was wrong and I think it stays on too long this way so I'll be moving it back to another flasher. I caught some video of it and once I edit it for time I'll upload it and post it here.