Green/pink/red Flickering Pixels

[ediblecastle]

my setup - puter: apple mac dual 1.8Ghz G5, OS: 10.5.5, video card: NVIDIA GeForce FX 5200 (64MB), monitor: HP LP2475w
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Hi there, hows it going?

I'm trying to find the answer to a problem I've read a lot about over the past couple of weeks. No one on all the forums I've been to, has had a decent answer.

Here's my situation.. I bought an HP LP2475w monitor. Instantly I noticed a few green flickering pixels on the screen.

I'm returning the screen but before I choose to either get a new one or a completely different model I'd really love to know what causes these green flickering pixels.

The pixels themselves are not always in the same locations (and sometimes they are pink). It depends on what image is currently showing at the time. for example... if i have a photo in photoshop with the green pixels on it, and drag it around the screen, the offending pixels will travel with the photo.

Here is a picture of a black to white gradient with 1 column of grey completely pink:
http://www.willarbuckle.com/knuj/pixelexample.png
Here, there are green pixels around the drop shadow of the window:
http://www.willarbuckle.com/knuj/greenpixels.jpg

Changing the resolution of the monitor either gets rid of the flickering green pixels or doesnt.. or makes it worse. For example, I get a few on native 1920x1200 res. LOADS on 1600x1200 and none on 1360x768

I've tried a few things: I tried a high quality DVI-DVI cable and this made it MUCH worse:
http://www.willarbuckle.com/knuj/redngreen.jpg
I've tried an HDMI-DVI cable and it got a little worse.
I've tried hooking it up to a windows laptop (DVI-VGA) and working as a 2nd screen, the monitor had flickering purple pixels.

I also had a dell 2208 LCD a few weeks ago. it worked perfectly.... except it was crap TN panel quality so i sent it back.

So most of these tests tend to point at the monitor being the problem. But then I read about people with the same problem who have fixed their green flicking pixels with changing the cable, or changing the video card. So it understandably gets a bit confusing. The problem also spans both windows and mac OS's and lots of different monitors.

So after I took into account the really bad customer service I got from HP and even though I really like the picture quality of the HP LP2475w (despite the flickering pixels) I decided to look around for some other monitors and learned about the Hazro HZ24Wi. I got quite excited about it because it had ticks in all the right places.(I want a 22-24" with IPS panel at a reasonable price) and it got some solid reviews out there.

I then read someone's review on here about his model having the same green flicking pixel problem. So that's when I decided to post this and see if anyone out there has any idea what causes this?

Thanks, i've tried to be as throrough as poss
-Will

 

[Caine Thanatos]

strange , its could be a problem with the scaler chip or other parts,... borked electronics
what happens if you turn is on and off again. whats the refreshrate

 

[ediblecastle]

if i turn it off and on. the same amount of flickering green pixels will be present on the screen.

I have noticed that if the computer sleeps for a long time there are more offending pixels on the screen when woken up. The number of offending pixels will the slowly drop within the next hour or so. but some will always remain.

 

[10e]

Sounds defective to me, especially if the same video card didn't display the problem on another monitor. I'll assume you also used the same cable to connect the Dell as the HP?

It doesn't sound like a common problem. You might want to go here and ask the question, as other owners of LP2475W might have better information than I:

http://www.hardforum.com/showthread.php?t=1326971&

 

[ediblecastle]

hmmm yeah, but like i said. from reading lots of forum posts it doesnt seem specific to 1 brand of monitor.

and no I'm afraid I didn't use the same cable with the dell. I used it's own dvi-dvi cable.

 

[philjohn]

Doesn't happen on mine, even when plugged into a mac mini (g4 era) which did cause green sparkles on my Hazro (aparently with the Hazro it's to do with the vertical refresh rate being slightly out of bounds to what it should be) - some people have stopped it using powerstrip on windows - don't know what you can do on a mac.

 

[ecat]

I don't get any of this on mine either. dvi-dvi, vga-dvi and composite are all fine.

 

[ediblecastle]

i waaaaas going to try out the Hazro, but philjohn has spooked me a bit about the green sparkles. So i guess I'll buy another HP LP2475w and cross my fingers.

I dont think I've seen an IPS panel 22-24" in the same price range as these 2 monitors. any other suggestions from people? I know there's the Apple cinema... but anything else?

oh yes, and I'd still love to hear from anyone who has a theory about the pixel problem.

 

[exploder]

I'm having this issue with my HP LP2475w that I just got on my Mac Pro with ATI Radeon X1900. Depending on which monitor port I use it on, I get either the pink/green pixels or horrible tearing. The green/pink happens on OS X and Windows, the tearing only on OS X.

The issue doesn't occur when I plug the monitor into my MacBook Pro, so I'm suspecting my video card is the problem and not the new monitor. The monitor works beautifully on the MacBook.