That worked :) The contacts run top and bottom of the screen there are none on the side of the screen. If you have the TRS-80 Model 100 Reference Manual page 75 has a picture of the top of the circuit board showing the contacts (link: http://www.classiccmp.org/cini/pdf/Tandy/Model%20100%20Tech%20Reference.pdf ) - they are tiny gold fingers on the board. The elastomer has bundles of vertical conductors buried in it that take the signal from the board to the bottom of the LCD glass panel and the transparent traces that run on the screen glass panels you can just see them in the video. There is also schematic for the screen in the reference manual showing how it is arranged and pg 34 provides some more details on the arrangement. Because the units are so old the elastomer has started to harden which means it no longer presses onto the board as well as it once did. It may also depend how the unit has been stored during its lifetime.
The oxidation generally occurs at the PCB to elastomer contact and a little gentle movement can sometimes clean it out and make a good contact once again. The de-oxit just helps with the process. It may take a few attempts to clean it so take your time and make sure nothing shorts out on the bottom of the board to anything else if you choose to perform the repair powered. The card has to be thin enough to fit between the metal of the screen surround and the PCB but strong enough to apply a little force to the elastomer. It is hard to get at some locations, particularly the ends, because the metal clips are in the way. As you slide the card along you should see the rows/cols blink off and hopefully the bad rows/cols come back to full operation. The cols and rows that are out in the video are on the bottom strip. From: M100 <[email protected]> on behalf of me <[email protected]> Reply-To: <[email protected]> Date: Saturday, April 11, 2020 at 1:07 AM To: <[email protected]> Subject: Re: [M100] Missing ROM elements > > > > woops i accidently unshared it > > > https://www.omgwtflol.net/nextcloud/index.php/s/7tM2KkR3Q5bCQXf > <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.omgwtfl > ol.net%2Fnextcloud%2Findex.php%2Fs%2F7tM2KkR3Q5bCQXf&data=02%7C01%7C%7C24497af > 72a8547ff991b08d7ddef6d00%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6372218 > 92699390262&sdata=KAR%2Bqgt522f9Bgw1M9RWnre%2Ff3cZwIWu4HFS8JnYoAk%3D&reserved= > 0> > > > It's reshared. Stupid me. > > > > > > On 4/10/20 9:15 PM, B4 Me100 wrote: > > >> >> The link takes me to a login screen? Is there part of the link missing. >> >> >> >> >> From: M100 <[email protected]> on behalf of me >> <[email protected]> >> Reply-To: <[email protected]> >> Date: Friday, April 10, 2020 at 4:38 PM >> To: <[email protected]> >> Subject: Re: [M100] Missing ROM elements >> >> >>> >>> >>> >>> >>> >>> >>> >>> https://www.omgwtflol.net/nextcloud/index.php/f/108057 >>> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.omgwt >>> flol.net%2Fnextcloud%2Findex.php%2Ff%2F108057&data=02%7C01%7C%7C24497af72a85 >>> 47ff991b08d7ddef6d00%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6372218926 >>> 99400258&sdata=EinLuIkF0E9ZUUY8Tu0GmOuVKT9X9MQVup3xhM9hegw%3D&reserved=0> >>> >>>> >>> >>> >> >
