Very common problem ³generally" caused by bad electrolytic caps on the -5V output line. The -5V is used to provide the contrast voltage for the LCD so when it fails the screen will fade out. If you recap the board it should go some way to fixing the problem. It will also help the +5V line too which should prevent other issues.
When replacing the caps check for damaged tracks under the caps - might cause frustrations down the line as they go open circuit and prevent other parts working. On 2/7/20, 2:06 PM, "M100 on behalf of Steve Glenner" <[email protected] on behalf of [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 >doesn¹t 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.
