I have been replacing all the board connectors on my EK while I have plenty of spare time. After replacing all of them, everything worked good except for the far right number on each display won’t light up. I tried changing the lamp driver board and have the same problem. Seems odd that all the numbers light up but one on each display. Any ideas? Thanks
http://stevekulpa.net/pinball/bally_disp6r.htm
this suggests a connection on the MPU is bad
were you replacing the header pins on the boards or the trifericon pins in the connectors ? ( or both )
will have to look at schematics to determine exactly which one to look at
Pin 1 on J1 on the mpu isn't making contact for some reason.
Lamp driver board has nothing to do with displays, controlled lamps only. Display driver circuitry is entirely on the mpu board (data and controls) and the power supply (power).
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White Stone, VA