I have been messing around installing some mods in my SF2 machine.
When trying to find a reliable 12V source, I disconnected the J1 connector on the power supply in the head.
I ended up tapping the 12V from a flasher, however I got a bit too excited and turned back the machine ON to test the mod while I totally forgot to re-insert the J1 connector.
I then noticed my dmd was all black with random dots on it, I powered it off right away and put the J1 connector back on the power supply. I then tried to launch it again and the DMD was black, no sound and GI light of the playfield are steady on.
I looked at the fuse and the F5 was blown, I thought maybe it happened while the J1 connector was disconnected, maybe once its in place changing the fuse would fix it. I changed the fuse with my only spare and turned the game on again. The boards had flashing red lights, then went off. Checked the fuse F5, blown again.
Been doing a lot of reading and I suspect it could be due to the U8 Gal chip, its a bit brown on the center of the label, I assume it might have burned.
Could the U8 gal chip alone cause the "short" blowing the F5 fuse or I may need to change rectifier bridges and other components to fix this?
Would appreciate any help