Okay. I sacrificed some plastic packaging and slid it in there with some
cleaner. no joy. I spent probably 25-30 minutes doing it. i'm going to
let it sit for a while and try it again. I have a honeydo list in the
meantime.
Your explanations were very straight forward and I appreciate it.
It doing this doesn't fix my problem, do you have any other suggestions?
I did some mild twisting of the pcb and didn't notice any difference.
Meanwhile I have a 200 incoming that I look forward in using. It may
suit my targeted needs more so than the 100. I have plans for the 100
though, once i can see the entire screen.
On 4/11/20 8:06 AM, B4 Me100 wrote:
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]
<mailto:[email protected]>> on behalf of me
<[email protected] <mailto:[email protected]>>
Reply-To: <[email protected] <mailto:[email protected]>>
Date: Saturday, April 11, 2020 at 1:07 AM
To: <[email protected] <mailto:[email protected]>>
Subject: Re: [M100] Missing ROM elements
woops i accidently unshared it
https://www.omgwtflol.net/nextcloud/index.php/s/7tM2KkR3Q5bCQXf
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]
<mailto:[email protected]>> on behalf of me
<[email protected] <mailto:[email protected]>>
Reply-To: <[email protected] <mailto:[email protected]>>
Date: Friday, April 10, 2020 at 4:38 PM
To: <[email protected] <mailto:[email protected]>>
Subject: Re: [M100] Missing ROM elements
https://www.omgwtflol.net/nextcloud/index.php/f/108057
