Monitor issues

March 2, 2005 at 14:22:32
Specs: Windows XP Pro, 2,7 Celeron, 512 RAM

Hi guys,
I just bought a brand new monitor - LG F720B. It's a flatron. I noticed that when I switch between dark and light windows, the tool bar (and eventually the whole screen) moves up and down. I installed the latest drivers for my nVidia video card but it did not change a thing. How to solve this problem? Maybe it's some monitor settings I should tweak?

I also want to know if it is somekind of a rule that flat monitors have a less sharp picture than the bulging ones. This LG is the second flat monitor I try (I had a MAG but I just returned it) and I noticed that both the LG and the MAG have kinda blurred, unfocused picture. It's noticeable on small fonts or image objects only. Is this a normal thing with flats?

Thanks in advance!


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#1
March 2, 2005 at 14:28:02

I don't know a whole lot, but I know if it's a cheaper monitor it will probably be a little cheaper made. And by this I mean the resolution and other peripherals.

I'd also try another video card. If the screen is a little jumpy this could very well be the problem. If you have a spare card, i'd just try to throw that in your computer without installing the drivers and see if the picture is better.


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#2
March 2, 2005 at 14:42:35

Usually a flat-screen will be better...your eyes don't have to adjust to the curvature of a regular screen.

As for the screen..it should be either your video card (and its drivers) or your monitor. Have you tried it's de-gaussing feature? I'm not exactly sure what the question is, though...is it something like when it switches resolution, the screen is no longer taking up the whole monitor?

As for the fuzzy pictures...every flat screen I've had has had crisp graphics. When you buy monitors, you should look at it's dot pitch...the smaller the number, the better. But even with a bigger number, it shouldn't be as bad.

If both of your monitors have been like that, then I'm starting to think that something is wrong with your video card.


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#3
March 2, 2005 at 15:26:05

Yes, both monitors have similar focus problems. Don't get me wrong - the picture is not *THAT* blurred - you notice the difference only if you have used a bulging monitor for a long period time. Many people would consider my present monitor's picture rather crisp.
I don't think that a video card can cause these problems. The same card shows a really crisp picture on curved monitors. It must be something else...
As for the jumpy picture - I REALLY need to find a way to fix it. It's so annoying...
By the way this LG degauses itself on start up and I can't find a way to manually degauss it (except turning it on and off several times)

The topic remains open


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Related Solutions

#4
March 2, 2005 at 16:50:30

There is no degauss for LCD monitors.

In regard to focus and fuzziness. Is the display card set to the native resolution of the display panel. A 1024 x 768 panel should have the display card set to the same.


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#5
March 2, 2005 at 19:39:08

the lg f720b is a decent CRT flat.try to make sure your using these settings,Recommend Resolution : 1024 x 768 / 85Hz,set both your monitor and video card to simular specs. found most specs and settings here.http://www.lge.com/catalog

Supertrucker


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#6
March 2, 2005 at 23:00:57

What is this monitor anyway....? A short tube, flat, CRT? I read this before, and was sure he talked about a LCD monitor too....

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#7
March 3, 2005 at 01:33:42

It is a flat CRT, not an LCD. I read good reviews about this monitor and I can't believe that it's causing me any problems at all (as I said, I had exactly the same fuzzy fonts picture problem with the MAG monitor)

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#8
March 3, 2005 at 01:39:44

By the way I just found where to degauss the monitor from. Did it several times - no effect at all :(

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#9
March 3, 2005 at 04:05:25

You can`t expect a cheap monitor like that LG to perform THAT well mate...
We searched for a razor-sharp picture CRT for CAD-drawing in the lower priceclass for ages, and ended up investing in a 1100€ one anyway. (which isn´t even closing to be an expensive model) As you said yourself: "Many people would consider my present monitor's picture rather crisp".

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#10
March 3, 2005 at 08:06:47

I am not expecting anything more than the "normal" quality picture of my old bulging monitor. I think that a 2004 LG model which has a 100% flat screen should be able to provide a better picture than my old 2000 LG monitor (i feel sorry that i dumped it now).

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#11
March 3, 2005 at 09:21:37

It is harder to make a flat face tube monitor sharp and more in focus than a curved face monitor. Also short tube (shallow) monitors increase the problem. Most of it is from the cosine effect in the electron beam path. The edges are father from the electron gun and are not perpendicular to the faceplate.

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#12
March 3, 2005 at 10:08:46

Thanks for the reply, wizard-fred. That's exactly what I thought - I suspected that flat screens cannot provide the sharpness of the curved ones (something like the screen in the cinema theatre is curved too, so the rays fall from the same distance on its surface)

I am still trying to resolve the jumping screen problem.


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#13
March 3, 2005 at 10:55:16

You can always check if that is the problem with your LG, and look if the images edges are blurred in the middle of the monitor too. There is a huge amount of electronics inside modern flat screen CRTs, that compensate the lengths for those beams, and it hasn´t really been a problem for ages anyway, not even economically for those that manufacture these things.
Check out that your monitordrivers are recognised by the card, and that nothing (magnetic) interferes the beams/electronics :)

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#14
March 3, 2005 at 14:20:48

Wow, I just found another "issue"
The center of the screen is darker than it's edges... It's noticeable on dark images. Damn, it gotta be the videocard - I can't believe that a brand new monitor can be THAT f*cked up!

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#15
March 4, 2005 at 02:04:05

Ok, I´m sorry but that quite certainly is a monitor issue...
There are quite a few things inside, that can cause these kind of things, when mailfunctioning.
There isn´t really a reason why a VIDEOCARD would do exactly that.
Now I wouldn´t doubt taking it to where it came from :) God bless Warranty!

And if the next one (if same) has the same kind of issues, then I unfortunately have to refer back to post 9.... ;)


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#16
March 4, 2005 at 02:39:52

This week I tried two brand new monitors. Different brands - a MAG and an LG. They both had absolutely the same problems - blurry picture, darker spots on the screens. They both were not magnetized and on both a strong degauss was performed without any results. Two different monitors, same kind of "issues".
Now I am almost sure that it's either the videocard either the connectind plug either the cable... Something like this.

Someone tell me a thing or two about the jumping picture, please.


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#17
March 4, 2005 at 03:21:59

I thought you said you had it working perfect with that old monitor of yours. But well, if u believe that something has happened after that, test your monitor with another machine/videocard. Fastest diagnose you can get! :)
I also asked you if your monitor driver is recognised by the videodriver, and if things are blurred in the center of the monitor too.

Now, before I whitdraw,
Here is a little something about CRT monitors, if you are still interested:

Focus is highly dependent on the quality of both the deflection yoke and the electron beam gun. Implementation of a high-quality deflection yoke ensures that the electron beam will strike the proper position on the CRT surface.

Implementation of a high-quality electron beam gun and focus lens are vital to ensure that the shape of the beam when it strikes the screen is as close as possible to being perfectly round, not oval or elliptically distorted.

Loose focus can be caused by the physical properties of the CRT display. The electron beams traveling to the corners of the display are longer than those traveling to the center. Therefore, the display circuitry must dynamically compensate for shorter and longer focal lengths of the electron beams as they scan the screen. Also, the beam shape can be distorted as it passes through the magnetic field generated by the Deflection Yoke. If this distortion is not compensated for by a Dynamic Focus Lens, the focus quality, especially at the edges and corners of the display, will greatly deteriorate.

Sharp focus also depends on the amount of current needed to write the image to the screen. When more current is needed to write the image to the screen, the electron beam becomes somewhat thicker. This causes the beam to illuminate areas around the spot for which it is intended. This illumination of stray phosphor dots causes the edges of the intended image to blur.

Byebye, and I hope you get everything right soon!


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#18
March 4, 2005 at 06:15:03

Thanks for your detailed reply, Misse. I'll try to test the damn thing on another machine asap.

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#19
March 8, 2005 at 07:42:55

I tried to read all the posts before posting myself. I didn't see anyone address the "refresh" issue and that will make the screen flicker which could be what you call "jumpy".

I too have an nVidia and they recently updated their drivers. Before chucking the monitor and/or the video card... check to see that your monitor pins aren't bent (where you attach to computer) and next go into the display setting to check your refresh rates... you should have it at the highest setting suitable to your computer. Mine is only 85 but no flickers. You will find this at: Settings/Advanced/Monitor within the Display Properties.


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#20
March 14, 2005 at 16:34:32

hi
my LG monitor is not supporting 1024*768 resolution and it shows a msg "out of range". plz can u help me to solve it (is there a need to change bios settings or anything or something else to sort this problem).


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