Screen jitters... Help?

[Phantom Wrath]

First off, I was a good boy and used the search feature to find this and this .

Anyway, as the title suggests, I have some problems with my Viewsonic A90f's screen shaking/jittering. It is more prominent in the upper right and bottom left corner. It hasn't happened until today, after I finished rearranging my dorm room. As the room is now, the screen is roughly 3-4 ft from the AC unit, and under my bed, which is lofted. However, when I turn the AC off, the jitter is still there. The only thing that gets rid of it is bumping the refresh rate down to 60Hz. It was at 72Hz with no problems, until today. I've tried moving the monitor further away from the wall and from the AC unit, but it still happens. Also, my speakers are squeezed in underneath the monitor (they're a cheap set of Boston Acoustics... I'm broke ). But, I've had them this way before today and have had no problems, but to rule them out I unplugged them and moved them away from the monitor. Unfortunately, this didn't work.

One idea that I have is that the problem occurs because my desk is now underneath my lofted bed. The matress support is a solid sheet of aluminum. Could this be refelcting magnetic waves back to the monitor? I don't know how plausible this is, just a thought and please correct me if I'm wrong.

Any ideas what could be causing this?

 

[BillR]

I’ve seen alarm clocks do it. I’ve seen desk lamps do it. Do you have a TV card in the machine? AC leakage from your cable can do it. Is any part of your machine electrically connected to anything else? Receiver, VCR, Subwoofer with a three-prong AC plug?

AC leakage from TV cable is a pain is why I asked. Also if any parts of the stuff your connected to use 3 prong plugs that can cause AC leakage as well. If so switch to a 2-prong adaptor, don’t hook up the green ground wire.

Sound cables, both RCA and 1/8th Mini plugs from other equipment can transfer jitter as well.

Start by unplugging everything from your computer except the keyboard, mouse and monitor. No network, no nothing. Do you still have the jitter?

Process of elimination my friend, it’s a pain

Luck

 

[Synful Serenity]

I have to chime in now because I noticed my 2141sb has started doing this as well in the last 2 days. It's very faint, and it's hard to notice unless you're watching closely, but words in certain areas of the screen will shake a little and stop. It's not a constant state, and it happens at different areas of the screen at different times. It has not happened before though, and I have not had a problem with interference here before (though I do live in a condo so anything's possible). I plugged my 10 year old Gateway Vivitron with the same cables in the same location, and so far it's not experiencing the same thing. I can't rule out the monitor itself for certain, as the Gateway just might not be as sensitive. I wonder what hardware component would be responsible for this if it was indeed the monitor?

 

[weebling1]

what BillR said

electromagnetic fields (ie. POWER, MAGNETS) may be inferfering. Move stuff and the monitor and test.

...or maybe the monitor has sucky frequency stabilization if lotsa people are having this problem.

 

[Flo]

If you move the monitor back to its original spot, does that fix it? If so, check what's on the other side of the "new" wall, there might be a transformer or something that's interfering with your monitor.

 

[Synful Serenity]

I brought it out into the living room and hooked it up to my mom's laptop and ran it for 2 hours and lo and behold, no jitters! Maybe its scared of something in the room.....well after nearly breaking my back, it's on the desk again and so far no jitters here either. I'm hoping it's because people are using power tools or something a few floors up to fix water damage from a fire on the roof last fall.