Howdy everyone;
So nothing appears on the screen of one of my Model 100 when I turn it
on. It's definitely not the all-black screen issue... quite the
opposite; the contrast knob doesn't make the otherwise blank screen get
darker or lighter. Furthermore, the screen itself definitely works as
well; I tested that via a working Model 100... the screen on the bad
Model 100 worked fine on the working Model 100, while the screen from
the working Model 100 ceased to work on the bad Model 100. Finally, I
also know that the machine is otherwise working, because I can blindly
work my way into BASIC and type "beep", and it beeps on command.
To try to get the screen output working again, I did a complete
recapping, and I also replaced the D13 and D15 diodes (using the closest
equivalents I could find via Amazon). And yet, still no go. I suspect
that the screen is simply not getting power, but... I only just realized
that I didn't think to check the VEE line on the LCD Connector. That
said, elsewhere I saw that the VEE line is getting -10ish volts, which
apparently isn't right but my two other Model 100s also gave me -10ish
volts as well, so I dunno.
So other than double checking the VEE line on the LCD Connector, is
there any other part of the board I should look at concerning getting
the screen working?
Thanks for your help!
— Philippe
