What would cause your computer screen to tremble or shake?
A few things can cause the image on a monitor to shake or quiver
- assuming that you are talking about a standard cathode-ray tube
(CRT) old-style monitor and not an LCD or other flat-panel
monitor.
First, though -- *!DANGER!* DO NOT OPEN or try to repair your
CRT television or monitor unless you have been properly trained on
the correct safety procedures. Every CRT operates on an internal
voltage of 35,000 volts (or more!) between the screen cathode and
anode, and the monitor's circuits will accumulate this charge
naturally over time, even without being plugged in! Seriously, this
can kill you! Don't say I didn't warn you. Anyway-
The most likely cause is electromagnetic interference from a
nearby device - by nearby, I mean within 18 inches or so. This
problem sometimes happens if you have a two-monitor setup, with the
monitor edges both facing you but not in line with each other.
However, it's also quite likely to occur if your monitor is sitting
flush back-to-back with another one, say, in a computer lab, and
-especially- if they are refreshing at different rates (one is 60
Hz, the other is 75 Hz, for example).
It can also be caused by high-quality but unshielded speakers,
such as a movie editor's near-field monitors.
More unlikely, there is something broken inside your monitor
that is allowing aiming point to shake -- if you can hear something
rattling around and the shaking gets really awful when you bump it,
I would dispose of that monitor immediately. For example, a
Trinitron monitor may behave like this if one of the support wires
has pulled away from the aperture grille through rough handling.
This can create a potentially dangerous short.
Solutions- Try moving the monitor to a different computer. --If
it still shakes, it's the monitor.
If it doesn't still shake, temporarily move the old CPU (just
the tower, no peripherals) to the new location.
--If the monitor shakes again now, you have a bad video card or
a very very bad monitor cable.
--If it still doesn't shake, then your problem is EM
interference in the original workspace. Move all moveable potential
sources of interference -- antennas, cell phones and cradles,
external hard drives, electric motors of any sort, microwave ovens,
shortwave radio transmitters, ECM jamming pods, etc.
See http://www.karbosguide.com/hardware/module7a4.htm for a good
description of the types of CRTs and how they work in general.
Wrong display settings, try to change things like resolution and
refresh rate If you have video on your motherboard, try a video
card instead. Swap your monitor to confirm that the problem doesn't
stem from the monitor itself.
Moving the cell phone away from the computer seems to have taken
care of the problem.
I thought my 6 year old monitor was knackered until I unplugged
my 20 year old Yamaha electric organ from the same 4-way socket and
everything was fine!
You could try to take the card that the screen plugs into out of
the computer; then back in. Don't touch any contacks and remember
to touch the case of the computer before you start. So that static
electrity will not fry your computer.
my 793s samsung crt monitor appear to tremble or shack . i tried
every thing you recommended but failed , pleasre tell me about this
problem and what can i replace in the video card or the main board
to solve this problem
i kept ups in one side of monitor which made it shake. when i
removed it, it stopped instanly.
