I searched the forums and could not find this specific issue. If I overlooked it I apologize. I have Stern Nine Ball with an Alltek MPU, and it boots with no problem. The 7 digit displays (all 5) are alternating numbers in sequence. For example, if every score display had a score of 0000000 all the "ones" will illuminate 000000"0" then the "tens" will illuminate 00000"0"0 and then the "hundreds 0000"0"00 etc. This also includes the ball count and credit count display. It illuminates about a second and goes dark and relights in unison with the other displays' "Ones", "Tens" "Hundreds" etc. Several digits will light at the same time on each display but all 5 are in sequence of "Ones", "Tens", "Hundreds" etc. no matter the score on each display. It is not a strobe where all 7 digits go out at once but more of a wave of numbers alternating simultaneously. The MPU is version 9.1 and it did not do this when 1st installed. I've tried plugging and replugging the "J" connectors. Any suggestion?

Thanks for the reply. I tried unplugging each display and they each do the same thing.

Yes, I just went and double-checked that I had changed them. The jumpers are set for Sten MPU200. I have contacted Alltek and Dave replied on a Sunday. He wanted to see a video so I have sent him one. Thanks again for the suggestion.

Ding, ding, ding, We have a Winner! That was it. The voltage was 40V. I had another SDB board on hand and swapped it and the displays are working as they should. I really appreciate all the help and input.