Thanks, Josh. My son (the family’s Electrical Engineer) is coming over this weekend and we’ll dive in. Your slides are very helpful!
george g. > On 04Nov2021, at 12:27 PM, Josh Malone <[email protected]> wrote: > > The first things to do when troubleshooting any M100 problem is to > check that the power supply is functional. There are test points on > the board that indicate "Vee" which is the negative 5v supply. > > The slides from my TASM 2019 talk go into a lot of detail on this: > > https://www.vintageboot.net/2019/09/tandy-assembly-talk-m100-repairs/ > > On Thu, Nov 4, 2021 at 3:19 PM George Goodman > <[email protected]> wrote: >> >> Hi all, >> >> My M100 display seems to have taken a turn for the dim. See the images in >> this shared folder —> >> https://www.dropbox.com/sh/y1cpftct6dgqy2j/AAAEb3PmIC1b30qh7FV_WX4ea?dl=0 >> >> I can’t point to anything that happened. I started an install of TS-DOS from >> my Backpack and, once the Initial Program Load began, stepped away from my >> desk to get a glass of water. When I returned a few minutes later I thought >> the M100 had flat out died. I removed the Backpack and tried turning the >> M111 on and off and even did a hard reset. No joy…I thought. >> >> I happened to sit down at my desk and catch a more extreme viewing angle of >> the display. That’s when I realized that there was just a display issue. I >> verified that I can start up Basic, make the system beep, open Text, etc. >> However, I haven’t found anything that will get the display back to good >> viewing from overhead. >> >> BTW, I did try the contrast dial and that didn’t have any impact. The images >> in that shared folder were taken with the contrast at its highest. >> >> Does anyone have suggestions for debugging and fixing this? >> >> Thanks, >> >> george g.
