Somedays you can help others and somedays you need the help.
After a nice and speedy burnt GI rebuild last evening, I'm onto the display issue this evening. So far, it looks like (knock on wood) that this is the only issue I have inherited with my Marilyn. Lights are good, sound/music is good, switches are good...displays not so much.
The top 16-digit display and the external jackpot display are both non-operational, and yet the lower main display is bright and crisp. So far I have tested the voltages -- good. In fact, it looks like someone had done the zener diode swap before as I have +80/-90 instead of +90/-100. All the connectors test good back to the CPU. Both ribbon cables test good. I have tested all the UDN6118 and 7180 chips as well as all the resistors. Using the ribbon cable to the jackpot display as a test, I have verified the high voltage as well as +5V going to many of the odd numbered pins.
At this point, should I just cut my losses and plop down the $200 for a new set of LED displays? I really enjoy fixing things but I see nothing board wise that appears to be wrong. However, I see nothing visually apparent in the displays to suggest they're outgassed either -- but I haven't had much luck sourcing information or photos on what one should look for.
Any additional troubleshooting is most appreciated. Worst case, anyone know where I can find pinscore displays for Taxi? Everywhere I checked is OOS.