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Quoted from wayout440:Looks like a common connector problem...probably need to re-pin the score display connectors on the left side of the MPU board.
Yes, first pay attention to the display blanking signal (orange wire), comes from the MPU board J1 pin 10 and goes to all displays on pin 10 of the display connector. A problem with it can cause ghosting like you're seeing.
Also check that the start button switch contacts aren't shorting to the metal door which can cause display issues.
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