Sounds like a tell-tale sign of -5v (Vee) instability. Basically, replace: - C82 - C84 - C85
and re-test from there. On Thu, Jul 2, 2020 at 5:06 PM Steve Glenner <[email protected]> wrote: > When the display comes on I see the normal text a M100 would show, the > list of files. > I have tried the cold reset procedure (control break reset) and it doesn’t > bring the display back. > > HOWEVER, I just tried something now, which is even after the display fades > out, I hit enter, I type BEEP and hit enter, and I hear the beep sound just > fine. So it seems like the computer is actually working, just the display > is fading out (obviously I have tried moving the contrast dial all around > with no change.). So it seems like my troubleshooting will be closing in on > the display and or parts of the power supply circuit associate with the > display. > >
