Skee Ball display
Just picked up a 13 foot Skee Ball machine. Price was right, it was local, I've got room, couldn't resist. :-) The previous owners had unloaded it on me because they were unable to repair it. Plugged it in and didn't get anything on the score board, but it made noise and I could coin it up and manually flip the ball switches and get a reaction. Found the wire for the display was plugged in the wrong way. Turning it the right way got all the segments to light up, but nothing would change. Got out the logic probe and it was getting signal and clock. Changed out the 74c164 on the left which controls the left digit and cascades to the rest. Fixed!