Dead Pixel Test?

Zwhaler

macrumors demi-god
Original poster
Jun 10, 2006
6,851
1,132
Does anyone know if how to test the screen for dead or stuck pixels? Because I don't really know how to tell, and I want to know if I have any because I can still return my machine unconditionally. Thanks.
 

Flyinace2000

macrumors 6502a
Sep 28, 2004
664
0
Zwhaler said:
Does anyone know if how to test the screen for dead or stuck pixels? Because I don't really know how to tell, and I want to know if I have any because I can still return my machine unconditionally. Thanks.
Take the screen, unplug it. Shake it up and down like an etchasketch. If any of the screen remains colorful then you have some stuck pixels.
 
L

Lau

Guest
Zwhaler said:
Does anyone know if how to test the screen for dead or stuck pixels? Because I don't really know how to tell, and I want to know if I have any because I can still return my machine unconditionally. Thanks.
I think if you had any you would notice, but try making a blank white image, and a plain red, a plain green and a plain blue image, and show them full screen. Any dead pixels will show up black, and any stuck ones will show up either red, green or blue, depending on which colour they're stuck on.
 

Flyinace2000

macrumors 6502a
Sep 28, 2004
664
0
Lau said:
I think if you had any you would notice, but try making a blank white image, and a plain red, a plain green and a plain blue image, and show them full screen. Any dead pixels will show up black, and any stuck ones will show up either red, green or blue, depending on which colour they're stuck on.

A large black image works best. It makes the bright red, blue or green pixzxels pop out if they are stuck on.
 
L

Lau

Guest
Flyinace2000 said:
A large black image works best. It makes the bright red, blue or green pixzxels pop out if they are stuck on.
Only if they're totally jammed on — I had one on my old laptop that would only show blue, but was off completely on a black screen. It would show up as black on a red screen, but would be almost invisible on a white screen. A black scren also wouldn't show up dead pixels. Best to try a white, a black, a pure red, a pure green and a pure blue screen. If you see nothing in them, you're ok.
 

TheAnswer

macrumors 68030
Jan 25, 2002
2,519
1
Orange County, CA
Probably best to do all five: all white, all black, then red, green and blue. I can see missing some of the colored ones in a different colored background, so the black can come in handy.

Edit: Yeah...what Lau said. Geez I need to type faster.
 

beatsme

macrumors 65816
Oct 6, 2005
1,204
1
most LCD monitors have a dead pixel or two. A 1024x768 resolution monitor has 786,432 pixels to deal with, so a bad one here or there isn't uncommon. If it's in a place on the screen that you can live with, don't sweat it.
 

flir67

macrumors 6502
Jun 23, 2005
256
0
I had one on my 27" hdtv that was hooked up to my mac min.

the saying goes, burn it in, use a screen saver on, and just leave it on constantly for 48hours.

lcd's have to be worked in over a period of time to achieve optimaliness of color,etc.

I did it to mine and with in a week the stuck pixel was fixed.
 

mkrishnan

Moderator emeritus
Jan 9, 2004
29,776
12
Grand Rapids, MI, USA
You might try Pixel Fix -- it's a widget that puts up a rapidly cycling red/green/blue block. The idea is that sometimes stuck pixels get unstuck with sufficient rapid cycling (no luck on the one in my iMac as of yet). But you can also use it to find pixels pretty easily, as they should be quite obvious if the widget is over the pixel.
 

JAT

macrumors 603
Dec 31, 2001
6,473
124
Mpls, MN
beatsme said:
most LCD monitors have a dead pixel or two. A 1024x768 resolution monitor has 786,432 pixels to deal with, so a bad one here or there isn't uncommon. If it's in a place on the screen that you can live with, don't sweat it.
Very true. In 19xx. Don't settle in 2006. There should be zero.
 

I'mAMac

macrumors 6502a
Aug 28, 2006
786
0
In a Mac box
mkrishnan said:
You might try Pixel Fix -- it's a widget that puts up a rapidly cycling red/green/blue block. The idea is that sometimes stuck pixels get unstuck with sufficient rapid cycling (no luck on the one in my iMac as of yet). But you can also use it to find pixels pretty easily, as they should be quite obvious if the widget is over the pixel.
But is is pretty small. Do you have to move it around the whole screen? I don't think I have any dead pixels but I can't tell really.
 

mkrishnan

Moderator emeritus
Jan 9, 2004
29,776
12
Grand Rapids, MI, USA
I'mAMac said:
But is is pretty small. Do you have to move it around the whole screen? I don't think I have any dead pixels but I can't tell really.
There's a version floating around that's full screen also... but in either event if it's there, when you use something like this it is very easy to tell.
 
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