I was looking at my display which had faded a lot recently and I noticed that it is a vacuum fluorescent tube. Now any of you in Pinball may remember that you can sometimes revive fluorescent display tubes by over-driving the filaments so they glow a dull red. Then I spent about 1/2 hour trying to find the pins. Finally on the schematic (Service Manual Figure 7-2 page 1 of 2) I noticed that in the upper right corner of the first page of the display schematic there was a circuit that looks like a bi-stable flip flop that is computer controlled and there were the six pins for the filaments. Then I looked at the back of my display to find the same pins and looking in the immediate area noticed that one of the two Zener diodes (surface mount) was missing. That was my problem! Found it lying in the bottom of the cabinet - must have knocked it off taking of/on the lid. Soldered it back on and the display returned to it's former usable brightness. There is a way to adjust the brightness as well. It is a setting - I think you have to use a sub program to get at it, but you can adjust it. I just forget how. Need to re-read the starter manual. When I find it I'll post it here. I have purchased a spare display tube for my 9100 though, I think it is a good investment for it's useful life extension. John :-#)# How to subscribe or unsubscribe from TTL To do either you send email to "MajorDomo@flippers.com" and in the body you state either "Subscribe techtoolslist" or "Unsubscribe techtoolslist", note that the Subject is "" (Blank)... FTP site is: ftp://ftp.flippers.com/TTL/