Punch-Out!! (Nintendo) PCB repairs
Tools: Schematics, Logic Probe
Problem: Missing opponents
Bad output on LSXXX on the Video pcb.
Solution: Replaced bad 74LSXXX chips at XX and 2J on the VID board
Problem: Player in the wrong spot on the screen.
My first though was this was a Video board problem.
Solutions: Buffer at location xx on the Video board was was out of circuit, repairing the trace shifted the player back to normal.
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