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30" LCDs

post #1 of 11
Thread Starter 
Currently I've got a 3008WFP as my main screen and two GDM-FW900s as my secondarys. But in my new apartment there's some sort of interference on the power lines, and it's causing the images on the CRTs to shake left and right (independent of the refresh rate). I'm going to try using an isolation transformer on them to see if it fixes anything, but if it doesn't I need a backup plan.

So, old/used stuff included, what are the cheapest 30" 2560x1600 monitors I can get my hands on?
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post #2 of 11
Here's a used 3007WFP on Ebay for $550 + $70 shipping:
http://cgi.ebay.com/Dell-UltraSharp-...item45f35c2596
Or this refurbished for $675:
http://cgi.ebay.com/Dell-30-Flat-Pan...item335df7f9a0
Rather than that I don't know if there's a 30" that costs less than $700.
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post #3 of 11
Quote:
Originally Posted by Manyak View Post
Currently I've got a 3008WFP as my main screen and two GDM-FW900s as my secondarys. But in my new apartment there's some sort of interference on the power lines, and it's causing the images on the CRTs to shake left and right (independent of the refresh rate). I'm going to try using an isolation transformer on them to see if it fixes anything, but if it doesn't I need a backup plan.

So, old/used stuff included, what are the cheapest 30" 2560x1600 monitors I can get my hands on?
It's definitely a power line issue? Have you tried a different circuit?

If the interference is bad enough to affect a display, you might want to get an electrician out there....
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
It's definitely a power line issue? Have you tried a different circuit?

If the interference is bad enough to affect a display, you might want to get an electrician out there....
It's not necessarily the power line that's the problem, it's something with a motor on it. It could be a fridge, an airconditioner, washing machine, whatever. Motors and generators are the same thing just that they work in reverse (you supply either mechanical or electrical power to the same device and the other comes out). So when you have a motor running it still sends a little bit of electrical power back across the lines that power it. In industrial complexes they use control systems to recapture that generated power and send it back to the motor, but in households there isn't a single one to be found.

I've already ruled out everything in my apartment, but I don't think the people living downstairs will like me poking around and unplugging everything they have to see what the cause might be.
Edited by Manyak - 6/10/10 at 5:53am
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post #5 of 11
Quote:
Originally Posted by Manyak View Post
It's not necessarily the power line that's the problem, it's something in the house with a motor on it. It could be a fridge, an airconditioner, washing machine, whatever. Motors and generators are the same thing just that they work in reverse (you supply either mechanical or electrical power to the same device and the other comes out). So when you have a motor running it still sends a little bit of electrical power back across the lines that power it. In industrial complexes they use control systems to recapture that generated power and send it back to the motor, but in households there isn't a single one to be found.
I can't remember my EE here.... but would placing a device on a seperate circuit loop help?
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post #6 of 11
Do you have a UPS ?
If not, you may want to try with one, as they filter many things, including some types of interferences.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
I can't remember my EE here.... but would placing a device on a seperate circuit loop help?
Yeah, but how do you propose to do that? Run another pair of cables from the power lines?

Quote:
Originally Posted by British View Post
Do you have a UPS ?
If not, you may want to try with one, as they filter many things, including some types of interferences.
I have one on my server but it'll take all day to get it out and bring it to my PC because of the way it's installed.

They do make UPSs with isolation transformers in them, which is what I had intended on buying if a standalone isolation transformer worked (I do want a UPS for my PC anyway, and I can use the isolation transformer on my stereo as a line filter). But to handle my PC at full load plus all 3 monitors (gotta assume that the power might go out while gaming) it would need be 1500W/2000kVA or larger, which gets REALLY expensive. Not just because of the cost of the UPS alone, but because it would require it's own 20A breaker and socket.
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post #8 of 11
Quote:
Originally Posted by Manyak View Post
Yeah, but how do you propose to do that? Run another pair of cables from the power lines?
I meant on a different breaker circuit.

I can't remember.... if a motor is induncing interference on a line.... does it affect all parallel circuits?
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
I meant on a different breaker circuit.

I can't remember.... if a motor is induncing interference on a line.... does it affect all parallel circuits?
Yes, any nearby ones (depending on the size of the motor). I think - though I'm not 100% positive - that running a separate pair of lines from the pole outside should make it far away enough for the interference to be negligible by the time it reaches the monitors, but that would require a whole new meter and everything from the power company so it's not really feasible.
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post #10 of 11
Quote:
Originally Posted by Manyak View Post
Yes, any nearby ones (depending on the size of the motor). I think - though I'm not 100% positive - that running a separate pair of lines from the pole outside should make it far away enough for the interference to be negligible by the time it reaches the monitors, but that would require a whole new meter and everything from the power company so it's not really feasible.
Oh, you think the motor is inducing interference not only on its electrical circuit but on all nearby wires?

If this is constant.... what are they running!?!??!
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