Sounds like a short. Maybe something got together when you had the playfield out. Hopefully just blew a fuse. Look it over really good and see .

Those wires with a diode for menue can definitely cause a short. A fuse should have blown. I would fix that and then start looking at if you are getting power. If anything blew on the boards after that.

Not sure if you did or not, but you can get a false read if you don't take fuses out to check.

Unplug the connection that controls that coil or coils to be correct from the mpu. That will isolate so you can work on switches and then get back to that problem which is probably connected to the switch issue.

You can look at your schematic or by the wire color

Wayout440 is correct you need to check those transistors after your done playing with your switches. If one is bad the coil will lock up again. Very good advice mentioned above.

Post #11. Explains how to test for bad transistors. Then you can go to the next step. Important to focus on one thing at a time.

It's going to be overwhelming until you start to narrow things down. You have to pick one thing. Go to YouTube and watch the pinball ninja video on LW3, I think it's the only video. Also watch the pinball repair of T2 that jack danger made I think it comes up if you type pinball repair. Both had multiple issues and you can see a good way of attacking this stuff. Isolation is a key and one thing at a time. I think it will help you so all this doesn't sound like Chinese.

Could be a faulty transistor, wire,fuse,diode, ?? Watch those videos they will help you I guarantee it.

Old coils and new coils not an issue. Check the serial numbers if you want to make sure they are correct. Then find out why they are not working.

So did you check to see if coils are correct for your pin? Did you check to see if you have voltage at coils? I thought the videos would help as a reference on troubleshooting.

Those are the proper coils. Now time to test for power to them and let me know if you have power at the coil.

Digital multi meter

Wait stop!!! Do you have a meter???

This will show you a DMM and how it's used.