I have seen this problem as well and have managed to fix a couple of the LCDs. There is an issue with the tracks on the LCB PCB corroding over time. Quite often, it is the under the LCD itself so it is not always visible. I have had success with re-running corroded tracks with fine wire usually by seeing which vias the corroded tracks are connected to, then jumping the corroded section with the fine (insulated) wire.
I have had to remove the LCD from the PCB on one of them to figure out which traces were corroded. In doing so, it also gave me the opportunity to clean up the pads from the LCD where they meet the PCB with isopropyl alcohol. Tricky work but do-able. On 14/10/17, 12:46 PM, "M100 on behalf of Jim Anderson" <[email protected] on behalf of [email protected]> wrote: > -----Original Message----- > > https://photos.app.goo.gl/3jkaHxX1P7RlQALt2 My LCD is slowly failing in my M100 and it started out like Greg's T102 on the left in his photo - a single blank vertical line halfway up the screen. Then another. Then a horizontal row failed (third row from the bottom). Then the fifth row from the bottom. New failures seem to happen within a few seconds after powering the machine on. The most recent one I saw happen before my eyes, about five seconds after powering on. Now I'm missing probably half a dozen contiguous rows of pixels at the bottom of the screen, spanning from the lower half of line 7 through the top half of line 8. At first this was just annoying, but now it's difficult to read what's on the last two lines of the screen. If I lose another row or two I won't be able to tell what's there at all. I've also seen machines on ebay with failed columns of pixels, so this can't be *that* uncommon... I'm hoping that somebody on this mailing list knows what causes this sort of thing, and whether there's a remedy. Is it bad connections to the panel? Failing driver ICs for those regions? (I know the two vertical columns which initially failed don't share a driver, but all of the rows that have failed more recently do.) jim
