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way to prevent interference between CRT's?

C

ChingChang

Supreme [H]ardness
Joined
Mar 27, 2003
Messages
6,504
Yesterday I realized I could fit both of my CRT's on my desk side by side. I'm usually only going to have one of em on, but sometimes I'll have them both on. But when I turn the second monitor on, the other monitor gets distorted kinda (screen gets distorted and changes color in some spots) but only for like a second or two. Then I notice this small faint grey horizontal line go down the screen on the left monitor (main) and it repeats, and on the right monitor the same line goes upwards and repeats. After awhile the screen kinda turns yellowish on my main monitor, and on the right monitor I don't really notice a change.

So there's a little crack in between the two monitors, and I was wondering if there was anything I could put in there to shield them so they don't get screwed up.
 
If you place a piece of "mu-metal" between them that should stop the magnetic fields from interfearing with each other.

Luck
 
ok, anyone know where I could get a small sheet of this? I'm not looking to spend lots of money. I searched for it and found a post by Ice Czar where he linked to a site (dead now)that sold a foot for like $20 (3 feet minimum). And is mu-metal the only solution? Maybe there's something else that's more affordable?
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ChingChang said:
ok, anyone know where I could get a small sheet of this? I'm not looking to spend lots of money. I searched for it and found a post by Ice Czar where he linked to a site (dead now)that sold a foot for like $20 (3 feet minimum). And is mu-metal the only solution? Maybe there's something else that's more affordable?
smile.gif
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Try any ferromagnetic metal (iron, non-stainless steel, cobalt {hehe good luck with that one})

Avoid metals like copper and aluminum.
 
Mine did that really bad when they were set at different refresh rates. When both were set th 75Hz, only a line would pass through one. But it was annoting so I spaced them out about a foot and they work fine.
 
swinchen said:
Try any ferromagnetic metal (iron, non-stainless steel, cobalt {hehe good luck with that one})

Avoid metals like copper and aluminum.
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So I could just get a sheet of iron to put between them? Dunno how much they cost, but I think I'd only spend up to $20, maybe $30 total.

I've never bought metal, so if anyone knows a good place to get it from please let me know
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You could have a go with a side panel off a computer, just have to make sure its the right type of metal. I know the side panel off my old server case worked for me in a similar situation, but in the end I just moved the monitors further apart and adjusted the refresh rates.

Also, if you've got an old oven, it might have a steel baking tray, I think all new ones would have aluminium which wont work.
 
So I should cover one in wire like a faraday cage? I put a side panel in between and it seemed to help. The horizontal lines that went up and down the screen seemed smaller on one monitor, and I couldn't see it on the main one. It still gets distorted when I turn them both on, but not as much. Maybe I can try to fit two of em in between.

Thanks for the help
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Tekara said:
you should just need to put a piece of chicken wire fence between the two, only thing you need to make sure of is that you want your fencing to have as small of holes as possible.
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Something like screen door material should work too. Very small holes. Alsmo it might not be a bad idea to ground the shield.
 
I got some screen type material (think it's steel. The window screens are aluminum, which I was told to avoid) but with slightly larger holes. Folded it in half and put it between the monitors with the side of the comp case. It's not perfect, but there's less distortion and the horizontal lines are gone on the main monitor, and barely visible on the second one. I'm pretty satisfied
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thanks

To ground it should I just attach it to my case? or the groud socket? Is grounding really that important?
 
I'm sure the case would do just fine, that's where my old powersupply was grounded to (and I mean OLD).

And how important is grounding? Shock yourself very quickly, then try to do it again with it grounded. ;)
 
so the metal between my monitors will build up an electrical charge? big enough to hurt someone?
 
ChingChang said:
so the metal between my monitors will build up an electrical charge? big enough to hurt someone?
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No, I don't think that could happen....

But if you have alternating magnetic field it can induce current in the cage. The alternating current can then produce a magnetic field. Grounding it should just help reduce interference in the cage. It might just be worth experimenting.
 
Right, and if it holds a magnetic charge, your CRT monitors will be more screwed up than they are now.
 
ChingChang said:
It still gets distorted when I turn them both on, but not as much. Maybe I can try to fit two of em in between.

Thanks for the help
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That's just the degaussing circuitry of the monitors firing off when they power on. It won't hurt anything.
 
alright, it should be grounded now. Just connected the metal to my case with some wire.
 
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