So I turn my JP on today, and I have no DMD. I check the fuses, and the .5 fuse in position F7 is blown. I check all the other ones and they test good. I replace the .5 amp fuse and as soon as I turn on the unit, it blows immediately. Upon checking the board, this fuse looks like it goes directly to connector CN1. The top two terminals are giving me continuity with ground. I've attempted to go over the schematic, but seeing how I'm not the most proficient with them in the first place, anyone that knows this data east game knows its crap. I've troubleshooted the ps board thus far. Removed every connector but the four prong power, and no fuses blow. I've connected all the connectors but CN1 and the fuse doesn't blow, only upon connecting that individual connector and turning it on does it blow.

Other than no dmd the game functions normally, completely playable.

I recently replaced my Q45 transistor for the coil which loads the ball into the shooter lane.

Any help would be greatly appreciated, Ive had three of my machines go down in the last two weeks, and this is the last one I have to get functional.

Its nice fending for myself. Community right?
Found that D5 diode on the ps board went bad. No longer blows F7 fuse.
DMD is still not functioning. Possibly fried.

Update.
Removed dmd from Jurassic park, Placed in High Speed 2 just to test. Lights up gargled. Proof dot matrix is not completely shot. tested power on board. I get really low voltages on first two which should be reading around 110-125v. 5v is good 12v is good 62v is good. Anything specific I should be looking for on the power supply board as the culprit.
I see you suggest The cap ( there are two) nearest the .5 fuse. I may just order a new ps board seeing how this one looks to have been through the ringer with repairs in its past.

Update. Rottendog board came in today. put it in the machine, wired up correctly. Dmd powers up, get a wavy orange squiggle through the middle. Doesn't move.

This is what I get, swapping ribbons makes no difference. I cant swap it out on any of my other machines. all Williams/bally. I'm unsure if the Display control board, rom, or actual dmd would cause this.

20160908_182656 (resized).jpg

tested out both the display and board in a stern machine today. Both appear to be bad. Going to call K's tomorrow and see about getting them checked.