Hi everyone. I am a still pretty much a novice when it comes to repairing my pinball machine. I am OK with swapping out parts and soldering, but not very good at understanding how to test things or to do board-level stuff.

Here's my story:
Last week we had company over and got into a marathon pinball series. All of a sudden the room smelled like burnt electrical parts. Inspection showed that my top right pop bumper coil got blazing hot and the plunger was stuck down. I powered off the machine and removed the coil. SG1-23 850DC. I went online and ordered a replacement (SG-23 850DC), which came with a new sleeve and resistor/diode? (I think it is a diode.) I cleaned and steel-wooled the plunger and reinstalled the assembly. After installation, the solenoid still does not work. I put the machine in diagnostic mode and all solenoids fire except that one. I have a feeling that something else must be wrong - perhaps on the driver board? I do not have any test equipment other than a cheap digital multimeter.

Firepower II and Black Knight share the same MPU and driver boards (Williams System 7 I believe).

Any advice on next steps?

Update -
Thinking I was a genius, I decided to try to eliminate the possibility that the new coil was bad. I detached the red and black wires from one of the other pop bumpers and then jumped those wires to the new coil, thinking that that would make it fire if the coil was good. WRONG. Pop sound, burn smell and smoke came up from the right rear side of the driver board.

Now when I power the machine off and back on, it sounds funny and solenoid(s) fire instantly. Did I fry the driver board? Can I fix the board myself or should I buy a remanufactured one? Will that fix my problem or do I need to look at something else as well?

My driver board has some burnt looking areas on it as shown here:

20190419_163051 (resized).jpg

20190419_163125 (resized).jpg

Thanks for theme replies. If I replace the driver board completely, can I assume that everything should be working again?