[rescue] Sun 21" CRTs (was: Feedback on Sun 24" LCD?)
hamellr at gmail.com
Tue Jul 8 09:48:42 CDT 2008
> Sure enough the microwaves were smack-dab on the other side of the wall
> from the monitor. We moved his monitor to the other side of the cube and
> he never had a problem after that.
> I think that was one of the things that taught me to always look at the
> environment first before diagnosing the computer. :-)
I've had some real similar problems in the past.
A mom and daughter plastic manufacturing plant that made things like
brochure holders and specialized shelving for display units. The mom and
(very hot but dumb as a brick) daughter shared a smallish office. The
daughter's monitor would just wiggle, go blank, have red spots at random
times during the day.
After several days of troubleshooting it, I finally actually got to see
the problem and realized that it resembled the dieing monitors that we
put magnets on to "fix" in high school. Searching the building I found a
small janitorial closet with an electrical panel in it that was right
behind her monitor.
We talked about it and decided that due to the cramped space in the
building that moving the computer just would not work. The discussion
moved around to how to stop the EMF, and moving the panel itself was
looked at very hard. I then remembered that next door was a heating duct
manufacturer. The mom went next door and came back a few minutes later
with two guys toting a 6x8 piece of sheet metal. They screwed it to the
wall and like that the problems went away.
On the next visit the daughter had covered that piece of metal with
magnets holding pictures of her and her friends.
The same place also had another EMF problem with a piece of BNC cable.
They had a CNC station that cut the plastic parts up. Nearby was an air
compressor that was used to blow all the plastic shavings off whatever
project they were working on.
Unluckily the air compressor was somehow not grounded properly. When
ever it went on the CNC computer would loose network connection and
would need to be rebooted. Tracing the cables I found that the network
cable was running under the power cable on the compressor. So in a bout
of madness me and one of the guys there rerouted the network cable along
the 50ft ceiling in the warehouse by climbing to the top of the shelves
throwing the cable over and through the ceiling struts then back down.
After that, the problem went totally away.
I've got similar stories about another guy who was an old time
Ham-operator. He under stood gain and signal strength but just could not
apply it to a computer based model, nor could understand that plugging 8
radios and two computers into a single 20-amp circuit would cause problems.
Tech Blog - http://www.1nova.com/blog
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