You have probably blown a Bridge Rectifier or voltage regulator, assuming all your connectors have been repinned.

https://pinside.com/pinball/forum/topic/vids-guide-quick-bally-driver-board-repair-bulletproofing/page/2#post-2113931

First check voltages at the regulator board, then check them on the solenoid board, finally check them at the MPU and make sure you have the proper number of flashes upon power-up.

Pull board, look for tiny **ring** crack around male connector pins on the backside.

Reflow with some fresh solder.

Use brass brush and clean up male pins.

If it's the female connector, then you can remove female sockets (one at a time) and clean up the little crimp spring with fine brass brush or 800g sandpaper, the re-tension the spring.

All the above are VERY temporary fixes.

Every classic Bally needs new female and male pins by now.

GPE probably has the best prices on that stuff.

Save your plastic female connectors, many of those are no longer made, so you just replace the female contacts inside.

Amazon has the best $22 crimper that will do both size crimps, search Pinside for exact part #