Thanks. To answer my own question, the 1N4148 diodes worked perfectly. All the regular keys are working. The function keys, not so much. I've squirted lots of electronics cleaner and clicked each switch dozens of times and only a few of the 7 or so broken switches have come back. Right now I dripped some vinegar inside to hopefully break up whatever corrosion might be inside...
On Sun, Apr 16, 2023 at 7:45 PM Brad Grier <b...@bradgrier.com> wrote: > RE: the polarizing film -- Jeff Birt (on this list) suggested > https://3dlens.com/ > > I have some, just haven't got to my project that needs it yet :D and with > the onset of spring, that one may sit for a bit. > > --Brad > > On Sun, Apr 16, 2023 at 2:10 PM David Plass <dpl...@alum.mit.edu> wrote: > >> I couldn't resist a recent M100 on ebay listed as "not working". The main >> issue was a dead contrast pot, which I have temporarily worked around and >> ordered a hacky replacement. >> >> The polarizing film is also very bubbly and no amount of smoothing made >> it stay flat on the LCD. Is there a known replacement for the film? >> >> Most importantly, I noticed about a half dozen non-functional keys. After >> disassembly I discovered corrosion on their diodes. Upon closer >> "inspection", said diodes disintegrated. >> >> So my second question is: Is there a particular diode I should replace >> them with? I have tons of 1N4148s, which look like a match (and >> electrically drop about the same voltage), but I can't find a spec for >> those diodes on the m100 schematics. >> >> Thanks >> -David >> >> >> > > -- > -- > Brad Grier > > >
