weird monitor problem

[psp83]

I've got this weird banding problem on my monitors, its only happened within the last month

You can't see it on white backgrounds but on blue and grey it shows, not tested other colours.


http://www.psp83.co.uk/pics/mon1.jpg


http://www.psp83.co.uk/pics/mon2.jpg


http://www.psp83.co.uk/pics/mon3.jpg

Any ideas what it could be and how to fix it?

[Steve]

Wild guess mains interference?

[psp83]

Dunno, nothing really has changed with my setup. I'm really stuck on this one and its very annoying.

[zappaDPJ]

It looks like interference on the video signal rather than any major hardware failure. I don't think it's anything like a graphics card failure as that would more likely show solid colour banding rather than the type of ghosting displayed. It looks like break though from somewhere. Do you perhaps have a source of electromagnetic radiation close by, speakers might be a possibility?

Short of trying another monitor or PC to rule things out, it's hard to know what to suggest.

[kinmel]

If that is a cathode ray tube monitor the problem is the need for degaussing, it is often caused by a large magnet being sited near the monitor; loudspeakers, or a transformer perhaps.

[psp83]

I have my PC speakers mounted behind the monitors on the wall, they've been there for 2yrs now.

The only change I have made is put my NAS drive ontop the tower, was below my monitors and I've put another tower under the desk at the back (my server)

[psp83]

If that is a cathode ray tube monitor the problem is the need for degaussing, it is often caused by a large magnet being sited near the monitor; loudspeakers, or a transformer perhaps.

No my monitors are HP LP2475w

My desk :



Pic taken last october (had no problem then)

[kinmel]

Follow the Wikiguide on degaussing methods.


ps  Sorry I posted that while you were posting that they are LCDs, so that won't do any good

[Steve]

Any use http://www.techmind.org/lcd/index.html#phasing

[psp83]

Any use http://www.techmind.org/lcd/index.html#phasing

I have no idea! lol

[psp83]

ok, its nothing to do with my PC.

I have to just connected my laptop to one of the monitors by HDMI cable and still get the problem.

[Technical Ben]

Oh, I was going to say it's the graphics card... Is the wire twisted? If there is damage to it, then it will garble the signal.
For some deduction...
1) Does anyone else have access to the room? (Could they have been polished, VACUMED?! or worse by mistake?)
2) Are the lines directly in front of the speakers? Have they vibrated the pixels apart? 
3) Are they near the sun or a radiator?

Or is it this...
To rule out analogue interference you have to use a DVI cable and graphics card (what card and model number do you have, you have dual monitors, so it must have DVI connectors right?). HDMI could still be running through an analogue adapter (like S-cable etc).

[zappaDPJ]

As you've ruled out the PC it shouldn't be too hard to track down. You have two monitors, are both equally affected?

[Rik]

What make are the monitors, Paul. That looks like 'burn in' which I experienced on a pair of Viewsonics. Check whether windows you regularly have open long term correlate with the marks.

[psp83]

Oh, I was going to say it's the graphics card... Is the wire twisted? If there is damage to it, then it will garble the signal.
For some deduction...
1) Does anyone else have access to the room? (Could they have been polished, VACUMED?! or worse by mistake?)
2) Are the lines directly in front of the speakers? Have they vibrated the pixels apart? 
3) Are they near the sun or a radiator?

Or is it this...
To rule out analogue interference you have to use a DVI cable and graphics card (what card and model number do you have, you have dual monitors, so it must have DVI connectors right?). HDMI could still be running through an analogue adapter (like S-cable etc).

1. No one touches my PC without me being there, as my job relies on the PC I keep a very close eye on it.
2. I have 5 speakers behind (shielded logitech speakers)
3. Monitors get no direct sunlight and radiator is about 7 ft away on the other wall.

Monitors are connected by DVI cables. Graphic card is a GeForce 7950 GT 512mb.

[psp83]

As you've ruled out the PC it shouldn't be too hard to track down. You have two monitors, are both equally affected?

1st monitor on the left, has the problem on the left going across to half way and the 2nd monitor on the right starts on the right and comes across half way also.

[psp83]

What make are the monitors, Paul. That looks like 'burn in' which I experienced on a pair of Viewsonics. Check whether windows you regularly have open long term correlate with the marks.

They are HP LP2475w. I have my windows mainly full screen.

These monitors wasn't cheap and still not cheap.. I paid £425 each for them. So going to be rather annoyed if I can't fix this problem.

[Rik]

If you do a screen grab, do the marks disappear on the resulting image (when viewed as a print, to eliminate any screen issues)? If so, then it's after the graphics card and can only be screen or DVI lead.

[psp83]

Heres a pic of both monitors with a grey bg

http://www.psp83.co.uk/pics/mons.jpg

If you do a screen grab, do the marks disappear on the resulting image (when viewed as a print, to eliminate any screen issues)? If so, then it's after the graphics card and can only be screen or DVI lead.

Will do a screenshot now.

[psp83]

If you do a screen grab, do the marks disappear on the resulting image (when viewed as a print, to eliminate any screen issues)? If so, then it's after the graphics card and can only be screen or DVI lead.

Lines don't show on a screenshot.

[Rik]

I'd bet on a panel failure then, Paul.

[psp83]

But whats the odd two going at the same time but the left monitor has the problem on the left side and the right monitor has it on the right side of the screen.

When I get up tomorrow/today I might take the monitors downstairs onto the dining room table and connect my laptops to them.. one windows 7 and one vista, see if the problem happens then just incase there's something local causing it.

[psp83]

Just a thought, I have loads of connections on these monitors. two dvi, 1 hdmi, 1 display port, and a few more.

I might try them all just incase one is failing.

[Rik]

Or swap left to right and see if there's any change (which would suggest local interference).

[psp83]

I think your going to be right about a panel failure on both.

I just connected my vista laptop by hdmi and that had the lines in the same place.