26 May
2005
26 May
'05
4:19 a.m.
On Thu, 2005-05-26 at 00:08 +0100, Tony Duell wrote:
Yep, those seem to work as expected.
Unplugging the feed from the CGA card results in a black screen, so it's
not as simple (as suggested on here) as it just being a connection
issue...
Just picked up an IBM 5155 luggable which was working up until the point
the chap switched it on to show me it working, when it promptly
broke :-)
On switch on it gives a narrow horizontal band of amber about 1.5" high;
after a couple of seconds the whole screen changes to flickering amber
with brighter zig-zag flyback lines visible.
You have tried fiddling with the 2 user controls?
What I would do is :
Pull the case (it's the 6 screws on the front),
Way ahead of you there - I've dismantled it sufficiently to at least
check it's not something obvious. Like you say though, connecting the
CGA output to a known-good monitor's probably the next step in order to
see whether it's a display fault or a logic problem. The screen
appearance makes it look more like it's on the display side of things,
but there's no guarantee at the moment.
(incidentally there are signs that it tries to boot, it gets annoyed and
beeps if the keyboard isn't plugged in etc., so it looks like most of
the digital side of things is happy at the very least.)
From what I remmeber, it's assembled with Bristol
Spline screws, with the odd tamperproof Torx in the PSU. The former are
not easy to get drivers for, I have a set, but they weren't cheap.
Oh heck, yes. I went through every alan key and torx bit I had trying to
find something that would fit the former. Ended up with a good ol' pair
of long-nosed pliers, and those bristol spline screws are getting
replaced with something a little more conventional on reassembly!
[snip]
That should be enough to get you started.
Yep - many thanks! :)
seeya
Jules