Path: utzoo!utgpu!watmath!watdragon!dahlia!swklassen
From: swklassen@dahlia.waterloo.edu (Steven W. Klassen)
Newsgroups: comp.sys.atari.st
Subject: Re: Mono monitor problems
Summary: Check your environment
Keywords: Atari, ST, monitor, problems
Message-ID: <14597@watdragon.waterloo.edu>
Date: 20 Jun 89 01:26:37 GMT
References: <936@ultb.UUCP>
Sender: daemon@watdragon.waterloo.edu
Reply-To: swklassen@dahlia.waterloo.edu (Steven W. Klassen)
Organization: U. of Waterloo, Ontario
Lines: 33

In article <936@ultb.UUCP> clf3678@ultb.UUCP (C.L. Freemesser (709ITP)) writes:
>
>1) Screen jitter:  Seems that the screen has a slight vertical jitter.
>   What causes this, and is there any way I can fix it?  It is somewhat
>   annoying.
>
>2) Screen "bent":  The top right corner of the screen is "bent".  There
>   are some sort of magnets on the yoke (4 of them) that I assume
>   control the deflection at the corners.  How do I fix this problem?
>   I did try moving them (loosened the screw and slid it around).  The
>   bend is not terribly bad, but it IS noticible.
>
I had problems like this once with my monitor.  It worked fine for about
four months and then I had to move.  The move required that I set up my
computer in rather cramped quarters hence things were shoved together
rather closely.  I noticed that my screen tended to jitter.  I also noticed
that my power bar was placed right next to my monitor.  When I moved the
power bar away the jitter stopped.

Similarly I once (very foolishly) placed a car stereo speaker, magnet down,
on top of my colour TV for a few minutes (while searching for something
in my junk box).  This did all sorts of weird and wonderful things to the
TV display and it remained distorted for about 3-4 minutes after removing
the magnet!

The moral of this (true) story is this:  Check around your monitor.  Remove
anything which has either a magnet of any significance or any large amount
of electricity moving through it (ie. power bars).


Steven W. Klassen
Computer Science Major
University of Waterloo