I posted this under X-Men but wanted to Post to a wider audience.
I turned on the game and got no video (using Color DMD) and no topper. Both using the front 12 volt connection. (And no backbox LEDs.)
I checked the fuses and F12 and F13 for the audio were not lit. I checked the fuses. Both good.
Lifted the playfield to look at the transformer and wires. Looked good. Turned on the game. Didn't work. Pressed in a connector at the bottom leading out of the transformer (either the large one coming out of the back or the one from the back with blue wires). I heard a click. Topper (from Tilttopper) lit then the color dmd came on and showed the message below. (Backbox LEDs too) Never seen this before.
I turned off the game and turned it back on. It seems to work. I played at game. At the end, I heard a click and the color dmd and topper went off. Heard a hum. Then it came back on. This is disconcerting.
I just unplugged the topper to put less stress on the 12 volt and will try. But want to post to see if anyone has seen this.
I unplugged the topper and the game ended normally the next time. (The only other difference was I got a high score when the issue happened and added my initials and the knocker coil fired. so will need to test this condition as well.)
I played a few more games. Turned off the game. Then a few minutes later turned on. It didn’t light up display or backbox LEDs and hummed. After a few seconds it clicked and display and back box LEDs came on with same message as below. Turned off and on and works fine now.