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what causes wobbly or wavy video?

A

ahurtt

Diamond Member
I have a ViewSonic Af90+ CRT monitor connected up to a BFG 6600GT OC PCI express card. This monitor is a couple years old and only has an analog connector, no DVI. The video card only has DVI so I hook it up using a little DVI to analog adapter. I only mention this because it is possible it could have something to do with the problem. When I up the resolution above 11x8 it starts to get "wavy" or "wobbly" like there is some kind of interference or something. I think I used to have the monitor on 1280 x 960 @ 75Hz with my old system and I don't recall it doing this. I did Degauss and it didn't help. The waves aren't so bad that you can't interpret the screen or anything but they are bad enough that you can't really look at it without being really annoyed for any length of time. It just kind of shimmies left to right such that if you drew a vertical line down the screen it would become wavy. Is this a sign my monitor is dying after only a couple years of use? Or is it just incapable of the resolution I want to use it on? Do I just need a better monitor? It is primarily a gaming system.
 
I think it could be the connection with the adapter. I see the same thing when using the dvi to vga adapter. But when I use my vga port it's fine no shimmer wavy crap. I doubt it's the monitor.
 
Not any closer or further than they used to be with my old system. Basically I only replaced the contents of my case but everything is still positioned the same as it used to be when I never had the problem. I am just wondering if the waviness is coming because I am "pushing" the monitor close to its performance limits of resolution and refresh rate or if something else can be causing the interference. Because it only seems to happen when I move to resolutions higher than 11x8 and the waviness can be decreased [but not eliminated] by lowering the refresh rate.
 
Originally posted by: ahurtt
Not any closer or further than they used to be with my old system. Basically I only replaced the contents of my case but everything is still positioned the same as it used to be when I never had the problem. I am just wondering if the waviness is coming because I am "pushing" the monitor close to its performance limits of resolution and refresh rate or if something else can be causing the interference. Because it only seems to happen when I move to resolutions higher than 11x8 and the waviness can be decreased [but not eliminated] by lowering the refresh rate.
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I've seen that happen before, oftentimes it can be caused by a lack of adequate power from the AC outlet too. If you've recently upgraded your rig to something more powerful, and then this started happening - if both are plugged into the same circuit, that could be one cause.
Pushing the monitor to the limits of its specs can also do that - it's putting the most strain on the power circuitry. It's possible that the timing circuits (sync PLLs, etc.) are getting a little flaky because of that.
 
Hmm, thanks Larry, that is a good thought. I will try running a cord to another outlet on a different circuit for the monitor and see if that makes the problem go away.
 
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