Got a Bally 35 MPU to fix as a spare for my baby pacman. Typical acid damage on it. Cleaned it up, reflowed all pins, changed the 5101, added lithium battery & blocking diode.
I get the correct led flash sequence - 1 quick then 6 more (baby pac doesnt do the 7th flash). The playfield lights flash but the game won't play and no video at all.
For giggles I swapped 6800 and the 2 6820/6821. Didn't help. I am guessing that since the self tests pass I need to change the 2 connectors j2 & j3 and not something internal to the board.
What do you guys think?
I get the correct led flash sequence - 1 quick then 6 more (baby pac doesnt do the 7th flash). The playfield lights flash but the game won't play and no video at all.
For giggles I swapped 6800 and the 2 6820/6821. Didn't help. I am guessing that since the self tests pass I need to change the 2 connectors j2 & j3 and not something internal to the board.
What do you guys think?

