Knights of the Round Repair Logs
This is another Capcom game with a suicide battery on the C board. Removed the dead battery. Traces on the custom IC were already cut so I just needed to jumper 2 pins of the encryption chip to +5v then replace 1 EPROM with a new one that had suicide free code to finish out the repair / phoenix of this board.
Symptom: Black screen, junk sprites.
The 3.6v battery on the C board read 2.9v. The board had suicided. Cut ground traces on pins 44/45 of the custom Capcom chip on the C board. Jumpered those pins to +5v. Erased and reprogrammed IC 23U with phoenix code. Tested the game.