Thought I could get some new faces in on this conversation with a new thread.....
I have a Data East Laser War. The displays do not light up and display any information.
I just rebuild the HV section on the power supply and we have good voltage on the power supply and on the display driver board: +5,-100,+100.
I put the Laser War mpu in my Monday Night Football. The display showed information for Laser War.... "data east presents laser war....."
MPU outputs verified good obviously since it's putting info on the displays.
Player 3, 4, and the ball credit display and their ribbon cables from Laser War were all tested good in my black knight.
Player 1 and 2 displays are wider ribbon cables and I don't have anything compatible to test them in. I can unplug them and the issue does not change in laser war. There is still noting on any of the displays in laser war.
I have voltage at all display connectors on the display driver board and I have activity (with the logic probe) at all display connectors on the driver board.
I have proper voltage at all ics on the display driver board.
Why will they not just light up? UGH!
The actual game plays 100%. All coils, sounds, switches, and lights are good and in proper working order.
My guess is that player 1 and 2 displays are fine since 3,4, and the ball/credit all tested good. The MPU is putting out the proper information and I have proper voltage.
What would keep them from just lighting up and displaying the information? This is insane. There is voltage and activity at all display connectors.
JUST LIGHT UP DAMN YOU! UGH............