5 years ago I posted on neo-geo forums and was like this is way too hard and put it away.
[ Ссылка ]
Game PCB: Neo-Geo MV2F (2 slot later revision I think)
Symptom: Lines through sprites on slot1, lines through neo-geo logo on both slots.
Steps: continuity check line in and around the battery area (mostly zmc2 and neo 257 chips)
1) One trace was obvious on the top side going to pin 19 of zmc2 (aka C1)
2) It took a bit but eventually I started doing continuity checks on bottom of board. Found an extremely small break going to zmc2-p10 (aka GBD0)
3) A through hole issue on 257-p64 (aka CR15) The through hole seems to be right where the corner pad is. I managed to get enough wire and solder in the hole to make contact with something.

свернуть