Hi my name is Harold Burgess Jr. I am trying to fix my Whirlwind Pinball. I got it broken, but I have been able to get it working after replacing the resistors on the power board the 39k 1w resistors. Now a few weeks ago my whole lower display stopped working. The top 16 digit display works ok just all the lower 16 digits is blank. I am not sure what would cause the lower display to stop working.. The part number is D-12232-1. I have the schematic for the display, but I am self taught learning to trouble shoot and building circuits. Can you point me to the most likely bad chip or something that would cause that issue. The machine is a system 11B Williams Whirlwind. The schematic for the master display is 16-9033. I checked the resistors on the power board they read perfect. The glow on the lower display is from the camera. I just do not have 250$ for a new display, It would be nice to play 4 players not 2. Thank you for your time. Have a grate day!!!

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My friend brought over his Pin Score LED Display and we installed it for test purpose. Both displays worked perfect. So I still think it is a bad chip or something on the display board, or not getting proper voltage, I will have to make time to check that. I also cleaned all the connections to all the display assembly. Want to hear something funny, now my whole play field went dark. I spent 3 hours to figure out it was the J9 connector on the interconnect board number D-12313-574, Replaced the connector with a new one. Its seems pin 1 on J9 is for the play-field lights thank God for schematics. Play-field works again. I just wanted to say thanks for trying to help on the display issue. I am thinking of getting a Universal Programmer, and replace all the chips that I think might be the problem on that board. I got all the M.A.M.E and PIN M.A.M.E stuff. I will eventually find the answer. Have a grate day!!!!!!!!