Wow! Those numbers are much more approachable than I realized. They are more like, 8th floor with no elevator, where I thought they would be outer space. This is awesome.
On Tue, Feb 26, 2019 at 9:29 PM Josh Malone <josh.mal...@gmail.com> wrote: > It's still a WIP > > https://www.eevblog.com/forum/projects/lcd-design-is-this-good-enough/ > > On Tue, Feb 26, 2019 at 8:45 PM Kevin Becker <ke...@kevinbecker.org> > wrote: > > > > Someone made new PC-1 LCDs? Could you provide a link? > > > > - Kevin > > > > > > > On Feb 26, 2019, at 8:00 PM, Josh Malone <josh.mal...@gmail.com> > wrote: > > > > > >> On Tue, Feb 26, 2019 at 4:45 PM Fugu ME100 <b4me...@hotmail.com> > wrote: > > >> > > >> I have used de-oxit on the edge of the elastomer to pcb contact in > the past – very, very sparingly to try and clean the PCB contacts. Then > used a piece of stiff card to very very gently push the elastomer in an > attempt to clean up the contacts. This tends to work for lines that are > blank rather than dim. The line is totally gone in this case either > horizontally or vertically and they tend not to repeat. > > >> > > >> With lines that are just a little dimmer than the rest I have not > found a good solution. If they are paired like this example it implies to > me that the driver chips are no longer working properly. The screen is > split in two parts driven by the same horizontal chips. So the 1&2 are the > same as 33 & 34 lines. > > >> > > >> As Jeff mentions check the –5V is close to –5V eg –4.89V or higher. > > >> > > >> The problem is not related to the battery replacement. It is simply > the age of the machine, the old LCD displays were prone to heat and > moisture problems and of course the chips themselves do age. > > >> > > >> Don’t be tempted to take the screen apart they are almost impossible > to get back together and work – yes I have tried it :) > > > > > > So have I. It doesn't end well. Due to their age, the zebra strips > > > have now been permanently deformed by the plating of the tracks on the > > > PCB (and possibly on the glass as well). I briefly looked to see if I > > > could find a vendor to make zebra strips the right size for the > > > M100/M102 displays but didn't find anything. These strips have to be > > > die-cut very precisely so that they apply even pressure to the LCD > > > electrodes and the PCB contacts. > > > > > > I think that if we could find a source for these elastomeric > > > connectors, we could "rehabilitate" a large number of M100 LCD > > > assemblies. Does anyone have good industrial contacts that might could > > > make these? I imagine we'd be looking at a multi-hundred min qty > > > purchase, but given the rarity of M100 LCDs I think it should be done. > > > If one guy can bring new PC-1 LCDs into the world, surely we can find > > > a source for this part. Right? > > > -- bkw
