I've seen your part 1 of this repair and I believe you also saw leaking
from all the smaller black electrolytic caps, didn't you? I haven't
seen the part 2 but I'll check it out. The capacitor list is great, I
was going to go through the service manual and assemble a list today at
work if I had the chance but this saves me the effort. I also used a
NiMh in my T102 and was planning to do the same for this guy.
------ Original Message ------
From: "Jeffrey Birt" <[email protected]>
To: [email protected]
Sent: 3/3/2020 10:15:07 AM
Subject: Re: [M100] LCD Lines
It ‘could’ also be a driver issue, i.e. the driver for one row is
flakey or not being enabled. You would have to try and match the
missing row up to the matching driver(s) and check for the proper
signals. Looking at the schematic there are several signals marked
‘CS’, i.e. PA0-PA7, PB0-PB1. These are the enable signals for each
driver so you could check at the LCD connector to see if they are all
being twiddled.
This is a classic issue with the ‘zebra strip’ on the LCD though. You
may be able to fix it by releasing the bezel and cleaning the LCD, PCB
and elastomer strip well.
I did a video on recapping a M100 and made up a color-coded capacitor
list with part numbers. There is a link in the video description to
download the list. I used a super-cap instead of a new battery on this
machine as an experiment. On subsequent M100s I have used NiMh cells
though as they have a much longer back up time. Arcadeshopper (another
list member) carries the batteries as do I.
https://youtu.be/IGTdNMx1V1w
Jeff Birt (Hey Birt!)
From: M100 <[email protected]> On Behalf Of Kevin
Becker
Sent: Tuesday, March 3, 2020 8:59 AM
To:[email protected]
Subject: [M100] LCD Lines
I've had a Model 102 for years that I enjoy tinkering with and I've
often thought I should pick up a Model 100 as well but never had a real
need. Now with new forthcoming REXCPM on the horizon I figured I might
start watching eBay looking for a deal. I ended up picking up a nice
clean (on the outside anyway) m100 that has some screen issues. There
isna large horizontal band of missing pixels all the way across the
screen as well as some vertical lines missing for about half the
screen.
https://imgur.com/JHnyrUB
I've seen the repair video linked below fixing similar issues.
Squeezing the bezel fixes part of the widest section of missing
vertical lines near the middle of the screen but leaves every other
line missing still. No amount of pressure anywhere around the bezel
seemed to affect the missing horizontal lines, nor the alternating
section of missing lines. My question is, is there anything else I
should check before removing the LCD bezel and examining the elastomer
strips? The NiCad has just begun leaking but has not reached the
board. All but one of the smaller black electrolytic caps have leaked
quite a bit though. Is there any way that damaged traces on the main
PCB would produce the issues on the LCD?
https://imgur.com/JHnyrUB
https://www.youtube.com/watch?v=bYa-zT75N9s
