My non-pinball buddy has a Silverball Mania that he acquired from his parents house. He has been recently (pre-virus) getting into playing a lot with me and finally got the bug to get his game going. I've been helping him work through a few issues on the phone and via text, but one has me stumped. When the game runs through the bonus sequence, it looks as if the score is adding up much slower than it should be compared to gameplay videos I've seen.

I don't have much hope that it's the display itself, but I told him to swap them and see if the issue remains. Anything else I can tell him to look at? I haven't ran into this issue on a classic Bally before and don't really have a great starting point since I don't have the game in front of me. I'm suspecting an MPU or IC problem but can't really talk him through that since I don't have access to the game and he isn't comfortable with board work yet.

Open to any ideas on this one!

The rest of the game seems to score as normal, I'll see if I can get a good video of it. I had a few suggestions that a stuck closed switch can keep scoring after the ball drains also and cause this to happen. I'm having him check that and also try and unplug the connector from the mpu when its counting down to see if it accelerates.