Quoted from Tuukka:
Surely you did not reconnect displays one by one with power on?
Do you have an original Gottlieb main board or a Ni-wumph or Pascal remake?
I never would do that with the power on and have Ni-Wumpf's replacement boards. The Rottendog PS is 12 years old. The game was great then out nowhere the 4th display got real bright and the others had missing digits and flashing while it was playing. If you disconnect one or two of the displays the others change their weird displays from. For example, with all 4 plugged in you number 1 would show the total score after each ball even though it was garbled during play while the others were like I said above, bright dim flashing. You disconnect one or more and number 1 no longer is right and the ball and credit display get messed up.
To top it off the 1/4 SB started to blow as well from time to time and everything would go dark. Again, this all came out of nowhere with the game in play. Ni-Wumpf repaired the board and the game still did the same thing to the point where I could not tell if the chip fried again or if it was something else. Ni-Wumpf said it could be the PS possibly. The last thing I need is to throw darts and money at a new PS, digital displays, and continued repair of the CPU only to not fix the real issue. I know I need to spend to fix it but am hoping to have a good place to start first with some help here so I don't buy expensive things I do not need. I really appreciate the help here. Thanks