Can you sub a fuse from another machine? or even the one you'e working on. Most of all Data East/ Sega weird issues are almost always fuses, at least in my experience. My Hook and LAH had a mind of their own....they would do crazy shit that had me looking for a false issues for hours and then it would turn out to be a fuse...Hook and LAH are my nemesis. I wish I could find out how much time has been wasted chasing ghosts on DE games because someone wanted to save .25 cents on fuse holders.

Sorry I have not read every post here but did you check F1 on the small display board too? If not check it by taking it out. Also please take out every fuse and meter them..this is something you should do when you buy a DE/Sega game anyway.

That will damage the meter...Ohm is for resistance or continuity, He's saying above when the game is on, you can measure the voltage drop.

Also check all the fuses and make sure the fuse clips are making good contact and are not cracked.