monitor shielding problems

[msi1337]

yesterday the fiance and I re-arranged the entire living room/computer area. We put the television and entertainment center on the opposite wall, and put the computer opposite that. Before the move we had no problem with any interference in the 17" CRT monitor we have. (Samsung 753DF).

After the move we noticed the screen shaking very badly at times. Sometimes it is barely noticeable, other times is shakes so bad that it is unreadable. I have begun diagnosing whether the problem is caused by dirty power from the outlet, or from electro magnetic interference. I have tried switching monitors with little avail.

I have also tried running a 25' industial power cord from the outlet we were previously using. This did not affect the condition. Then I tried moving the monitor further away from the power outlet. Little to no difference. Is there a way for me to determine if the monitor shaking is caused by the power outlet, or by interference?

If I had to bet, I would say that we are experiencing AC EMF intereference issue. Due to the following:

a) setting the monitor at a higher refresh rate makes the shaking less noticeable
b) when other devices in the house are turned on, the problem can worsen or get better
c) the apartment we have is 30 years old, and not know for good upkeep and/or EMF shielding

so, any help anyone can give as to possible solutions would be greatly appreciated!

some solutions I have seen on the internet are:
a) replace CRT with an LCD monitor, which is not troubled by AC fields
b) get a monitor shielding box (can be very expensive)

 

[Squally Leonharty]

Try moving the monitor back to its original position, before you moved everything. See if it happens again. If nothing happens, then there must be some electrical device close to the monitor. It doesn't have to be something in your room alone. It's possible there's some large electrical device behind the wall. I've read that such devices are powerful enough to cause EMF interference through the walls.

If it still happens, well... I don't know, really... Try unplugging everything and connect your monitor again. If it STILL happens, then there's really something wrong with the monitor or there's still some influence going on from somewhere else. *shrugs* I'm not very familiar with EMI or whatever, but who knows this helps.

Another thing you could do, but it may be quite a hassle to do: move everything back to its original place and check again?

By the way, my monitor also has some trouble, but it's hardly noticable and I read that's normal for AG monitors (I have NEC/Mitsubishi 2070SB 22"). I'd also suggest buying a properly shielded cable for the monitor, which I'm going to do as well. Mine is way too long (2 metres, I guess, which is too much for my desk) and goes along with several other cables. :\

 

[beatle]

Is that monitor on the same circuit as the other devices? Try running it from a different circuit altogether. The extension cord should help here.

You could also add a UPS with line conditioning. Sams Club sells the APC BackUPS Pro 1100 for around $125. Great investment. It works for me. One of my 3 monitors is not attached to it. When I plug in my electric space heater into a nearby outlet, the one monitor not on the UPS will get the shakes.