The service / technical manual has a very clean troubleshooting
procedure for this LCD issue in section 5. For Vee (-5 rail) check
D15, C85, D14. Given that the problem has a time correlation to it, my
money is on C85.
The service manuals for these machines are EXCELLENT. I highly
encourage
Did you check the Vee voltage? It should be close to -5V.
What you describe sounds very much like a failing -5V rail. But need to
confirm with the Vee measurement. It might be time to replace the
capacitors :(
On 7/1/19, 11:17 AM, "M100 on behalf of Jim Anderson"
wrote:
>So, I had a VEE
I just realized I could half-answer my own question by trying my LCD board on
one of my kids' M100s. Can't do it right now because I'm at work, but at least
then I'd know whether the problem is on the LCD board or not.
jim
So, I had a VEE problem a while back, and I haven't got around to replacing the
caps on that motherboard yet. I pulled the board from a parts machine which
I'd already cannibalized for its LCD and keyboard, and swapped it into mine.
(Actually, I didn't even bother pulling the board, I just
The +5V looks good, the -5V is a bit low it would be better in the -4.9V
to -5.1V region. That should go up when the caps are replaced.
It sounds like there is a bad joint somewhere on the board.
I think most Model T owners have more than one unit :-D
On 7/1/19, 7:48 AM, "M100 on behalf of
