trembling CRT monitor

[luc wastiaux]

Hello,

the PC my mother uses at work has a problem: the image from the CRT
monitor is trembling ("shaking" slowly). I doesn't seem to be an issue
with the monitor itself, since the monitor works fine here at home
(anyway I tried swapping the monitor to be sure, and the other monitor
behaved the same way).
I also tried swapping graphic cards, with no results.

I am starting to think that there is an electrical or magnetic problem
at the place my mother works. She says that the "trembling" problem is
particularly accute when the garage door is moving.

I tried moving the PC case inside the room, placing it 10 meters away
from its original location, which gave no results either.

If the problem is really with either the electrical outlet, or with a
magnetic field near the room, how can I be sure, and how can I solve the
problem ? Will an LCD monitor be affected the same way ?

Thank you for any suggestions.

 

[Chris Stolworthy]

Hello,

the PC my mother uses at work has a problem: the image from the CRT
monitor is trembling ("shaking" slowly). I doesn't seem to be an issue
with the monitor itself, since the monitor works fine here at home
(anyway I tried swapping the monitor to be sure, and the other monitor
behaved the same way).
I also tried swapping graphic cards, with no results.

I am starting to think that there is an electrical or magnetic problem
at the place my mother works. She says that the "trembling" problem is
particularly accute when the garage door is moving.

I tried moving the PC case inside the room, placing it 10 meters away
from its original location, which gave no results either.

If the problem is really with either the electrical outlet, or with a
magnetic field near the room, how can I be sure, and how can I solve the
problem ? Will an LCD monitor be affected the same way ?

Thank you for any suggestions.

Assuming that the problem is magnetic, then no a LCD monitor would not be
affected int he same way. If you really moved it 10 METERS from the
original spot and the problem didn't correct then I would guess it is a
problem with the power in the house. Otherwise that would be one HUGE and
excessively powerful magnet in the home. I mean unless she is using a
super-electromagnet to prop up her dining table I doubt it is magnetism.
Try putting it on a UPS and see if the problem clears itself up.

Hope this helps,
Chris

 

[Bennett Price]

Hello,

the PC my mother uses at work has a problem: the image from the CRT
monitor is trembling ("shaking" slowly). I doesn't seem to be an issue
with the monitor itself, since the monitor works fine here at home
(anyway I tried swapping the monitor to be sure, and the other monitor
behaved the same way).
I also tried swapping graphic cards, with no results.

I am starting to think that there is an electrical or magnetic problem
at the place my mother works. She says that the "trembling" problem is
particularly accute when the garage door is moving.

I tried moving the PC case inside the room, placing it 10 meters away
from its original location, which gave no results either.

If the problem is really with either the electrical outlet, or with a
magnetic field near the room, how can I be sure, and how can I solve the
problem ? Will an LCD monitor be affected the same way ?

Thank you for any suggestions.

Is there are large building transformer (welding machine, Xray machine,
large motor machine) on the other side of the wall? All of these can
give a monitor the shakes; ditto fluorescent desk light and pencil
sharpeners. A UPS is unlikely to help since most of the time on most
UPS's they just pass the wall current through without modifying it in
any way.

The shakes can come through the air as magnetic changes or through the
power wireing. If you rotate the monitor 90 degrees does the problem
diminish (or get worse)? Then the problem is through the air. When you
moved the monitor 10 meters did you use a different wall socket? Try
using other sockets in the room; you might find one that is a lot better
(on the other side of the neutral.)

I believe if the problem is through the air, an LCD monitor would be
immune. If it is through the power wiring, another (better) CRT might
fix the problem. I don't know whether an LCD monitor would
automatically cure things.