faint black lines

[SabreWolf3]

Hi all,

My friend has a Dell P780 flat panel CRT monitor... and there are two faint, black lines appearing horizontally across his screen. The lines go all the way across the screen. The first line is 1/3rd of the way down from the top, and the second line is 1/3rd of the way up from the bottom. What are these lines? Are they dead scan areas or something?

Thanks for the help.
-- Richard

 

[Whiteskin]

Is he overdriving the LCD (beyond its natuaral capacity?). If so, it could be that the overdriving is causing something similar to moire.

 

[chakorules]

Is this a NEW LCD? Ask the vendor if there is a DEAD pixel policy. Sounds like you lost a whole row of pixels. This is common in LCD screens.

 

[chakorules]

errrr....wait...

You said flat panel "CRT"....do you mean LCD or a CRT?

If it's a CRT with lines, that's normally a video card sometimes. Can you swap a video card and check?

 

[Whiteskin]

Wow.... I didnt even catch that. Yeah, most likely software (/ graphics hardware) here.

 

[ceri sheeran]

Hi,

The tube in the CRT monitor is likely to be a Sony Triniton tube. These require what is called a "mask" for some technical reason I cannot recall.

One of the effects of this mask is two faint lines either horizontally or vertically on the screen.

If the tube is a Triniton, they are quite normal. Nothing can be done about them, by any means.

hth

Ceri

 

[John Sparkman]

ceri sheeran is right.
I have a flat panal CRT myself (NEC MultiSync FE700+) and I have the same lines. Here's a quote from the book. "Thin lines are normal for an aperture grille CRT and are not a malfunction. These are shadows from the damper wires used to stablilize the aperture grille and are most noticeable when the screen's background is light (usually white)."

John