I was testing some used displays that I purchased on my Stern machine. On the last two I tested, all digits except the 10s digit worked. When I put my original back in, now all of the 10s digits don't work in my original displays (the same digit doesn't work on all displays). Seems like I did something to the MPU - any thoughts?
MPU board J1 pin 2 is the 10's digit signal to all the displays. Likely you've got a bad connection there.
Quoted from fb_rider:Thanks for help! It turned out that a wire had pulled out of the display connector on player 4. Fixed it and all displays are working again. Not sure I understand how but I'll take it!
easy to understand - all of the displays are daisy chained. A fault in one will (in many instances) will show in all.
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