The fuse is blowing before the balls start kicking out of the trough. Once the fuse blows, power to the optos is killed and the game thinks the trough is fully loaded so it starts kicking out balls.

The light up topper is likely a problem. The extra current pulled by the LEDs could be enough to blow the fuse when all 12V motors are active.

Make sure you are using a slow blow fuse at F116.

Try unplugging the topper and see if it's still blowing. If that fixes it you'll need to either increase the fuse by the smallest amount to accommodate the topper or wire in an external 12V supply for the topper.

The generally accepted solution is to use an external supply to avoid excess heating of the board's unregulated 12V supply.

J116-J119 are all sourced from the same unregulated 12V supply so moving to a "different" unregulated 12V source on the driver board won't change anything.

I'd be focusing on the motors themselves as the combined current of the motors and optos is exceeding the game spec.

It's possible someone changed out an opto or motor for one that pulls more current. This has been an issue on games like CFTBL where the halogen lamp was replaced with one that burns more current.

One thing you could do to try to track it down is to pull the fuse at F116, and insert a DMM across the fuse terminals to measure the current.

The optos are always on so you can record the current with the game in attract mode to get the opto current.

Then put the game in test mode and activate each motor to measure the increase in current due to each motor.

You can then compare these measurements with those from a working game to identify the problem.