Stuck subpixels. Or not?

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Chipicao

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A stuck pixel will usually be most visible against a black background, where it will appear red, green, blue, cyan, magenta, or yellow, although stuck red, green, or blue pixels are most common. Each pixel on an LCD monitor is composed of three subpixels (one red, one green, and one blue) which produce the visible color of the pixel by their relative brightness. A stuck pixel results from a manufacturing defect, which leaves one or more of these sub-pixels permanently turned on or off.
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I already knew this, posted it only for the sake of the argument.

I just got a HP LP2475 (H-IPS) and yesterday I noticed an area near the bottom-right corner that has 50+ stuck red subpixels. I always use a black background but haven't seen it at first because of my poor sight.
Out of curiosity, I decided to test with more background colors, and the results were staggering: no red subpixels are lit when using blue or green backgrounds!

  • Black
    910252521c22bb897cf64dabd0d0b194.jpg


  • Green
    e8e8ccb76ea8e424701506e97c60ab40.jpg


  • Blue
    a095a8bab4783463ec06b3cf0fdbaffd.jpg

What's the deal here? Is this some other kind of panel defect?

P.S. red and white, just for fun
 
Pretty colored lights!

That's a panel defect for sure, or the panel was impacted causing the problems. Return it as fast as you can.

Thanks for the up close photos.
 
I'm returning it for sure, but I'm just curious.
It's really a shame because otherwise the panel is flawless (I even can't see the white glow people are complaining about - or maybe it's just me...)

P.S. I would have made even more up-close pictures but I don't have my HD camcorder (it can focus from a really small distance)
 
Holy crap, I encountered the same defect in an NEC LCD2690WUXi:



That's definitely a panel defect.

Also, since you don't see a white glow, do you see a faint red or green glow instead? Can you get a picture of a black screen at an angle in a dark room?
 
Wow, yours seems to have a pretty large area with those dots. Mine is about 1 square cm.
What is it with these IPS panels?

P.S. The white glow is there, it just doesn't bother me :) No red or green
Can't wait to get a new one!
 
I've also got a 2cm x 1cm area (l/w) filled with these red dots, and they only show with fullscreen black. They are only noticeable when you look real close. Are these bugged pixels or what? (LG w2600hp-bf S-IPS)
Did you guys get warranty?
 
I have a single pixel with this issue. Not sure if it falls under warranty or if it's worth replacing over. Yours, however, is definitely a defect and worth replacing for. That looks like at least ten pixels easy, so yeah, should be no problem.
 
As soon as I got my Dell 3007 WFP-HC turned on, I went directly to Pixel Buddy and tried all the combination colors. Thank goodness, no stuck or dead pixels.

That, you see, would have disappointed me to no end having an outfit that does not turn these on and use some kind of Dead Pixel program to see what you are noticing right now is just not professional. Send it back as the others have mentioned
 
SR45 said:
As soon as I got my Dell 3007 WFP-HC turned on, I went directly to Pixel Buddy and tried all the combination colors. Thank goodness, no stuck or dead pixels.

That, you see, would have disappointed me to no end having an outfit that does not turn these on and use some kind of Dead Pixel program to see what you are noticing right now is just not professional. Send it back as the others have mentioned
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It costs money, plain and simple. Manufacturers could easily throw out defective panels, but that would mean lower yields. They figure most average users are not going to notice one or two dead pixels, so their warranty typically doesn't cover them. What annoys me most is that more expensive panels clearly aimed at enthusiasts or professionals do not have professional quality and service standards to match the price.

By the way, might want to run your program a few times in the next several weeks. Dead pixels have a habit of appearing (and sometimes disappearing) after first turned on, sometimes several days later.
 
sear said:
It costs money, plain and simple. Manufacturers could easily throw out defective panels, but that would mean lower yields. They figure most average users are not going to notice one or two dead pixels, so their warranty typically doesn't cover them. What annoys me most is that more expensive panels clearly aimed at enthusiasts or professionals do not have professional quality and service standards to match the price.

By the way, might want to run your program a few times in the next several weeks. Dead pixels have a habit of appearing (and sometimes disappearing) after first turned on, sometimes several days later.
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I do check often, and thank you for the heads up
 
I've never seen so many lit pixels... Call HP and get them to replace it.

Just curious, but how do you get those images that show the pixels so clearly?
 
I'm assuming super macro mode on a camera? Anyways, I have always thought dead pixels to be more of a random thing. These patterns are interesting and leads me to believe it is something related to the internal circuitry or something. There's no way all of those pixels died in such a nice pattern. :p
 
PC_User said:
Have you tried running JScreenFix?
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I don't think such a program will help with these Stuck subpixels.

Here my snapshots.
With the camera it seems like 10 times worse.
It isn't really visible on the black, but the camera registers it way better then our eyes.


reddots1.jpg

reddots2.jpg


ps. pics made with canon ixus 70 compact camera.
 
That's a pretty bad red streak on the monitor. Get it replaced.
 
Well i went to the store's customers support and i got a completely new monitor.
It was handled as hardware malfunction rather then a pixel problem and therefore they gave me a brand new LG W2600HP-BF.

I showed them the above pics and that really helped them seeing the problem rather then testing it and waste my precious time.

Hope this new screen won't have this problem, couldn't really see anything on the new panel with the lighting at the customer support.
 
Ah, God damnit. I was checking the backlight uniformity today with a completely black screen, when I suddenly noticed I have an area of stuck subpixels:

CIMG3739-1.jpg


I received this replacement last week after I RMA'd my last W2600HP due to excessive backlight bleed. This one is close to perfect in that department, and at eveything else too. I was really happy with it until this crap showed up. Now, I have used it for a week without noticing, and it only appears on completely black surfaces, and also then it's hard to spot. I have to sit down and think if I should return it or not. I'm getting tired of shipping this huge and heavy thing around like this. It also looks like LG really needs to step up on their quality control -- this is just unacceptable!
 
Unacceptable for me and would not stand for it one nano second. You paid good money for a good monitor and my LCD and most others do not display this sub pixels.

Good luck with your RMA.... Again
 
Yeah, I guess you're right. Thing is, I have 14 days money back guarantee from reception, which means I have 6 days left of that. In other words, I can send it back and get all my money back with no restocking fees. Instead of battling with another slow RMA process, this is probably the easiest way of doing it. I guess the question is now, what should I do when I get the money back? I'm not so sure if I want to play the lottery with yet another LG panel. Two DUDs in a row is enough for me. :(
 
Adrgha said:
Yeah, I guess you're right. Thing is, I have 14 days money back guarantee from reception, which means I have 6 days left of that. In other words, I can send it back and get all my money back with no restocking fees. Instead of battling with another slow RMA process, this is probably the easiest way of doing it. I guess the question is now, what should I do when I get the money back? I'm not so sure if I want to play the lottery with yet another LG panel. Two DUDs in a row is enough for me. :(
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Where is the defect at? If it's not in the middle of the screen, and you didn't notice it for a week, you may be able to get by with it...
 
xorbe said:
Where is the defect at? If it's not in the middle of the screen, and you didn't notice it for a week, you may be able to get by with it...
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Sorry for the lousy quality of this photo, but it's somewhere in the area I've highlighted in red:

CIMG3741.jpg



So yeah, not in the middle, but not too far from it either.
 
Do you have to ship it to RMA it, and pay those shipping costs yourself?
I got mine at a local (web)store so i could simply go back, drop it off, and get a new one.

I haven't seen this monitor in any department stores until yesterday.
We've got a large chain of department stores here called Media Markt and i found the LG W3000HP-BF and the W2600HP-BF there.(build feb 2009, so no old stock) (like 30~50 euros more expensive then at webshops, but probably way easier with RMA)

So if you bought it through a webshop i would ask your money back and check if you can buy it anywhere closer at some department store and then test the display there before purchasing it.


ps. although LG has problems with this display, there really isn't any alternative for this display in the same price range.
 
I'm not going to RMA it, I'm sending it back on the 14 day-money back guarantee that is applied to all e-tailers by law here in Norway. Much quicker and less trouble than with an RMA.

When I get my money back I'm probably going to get a different screen. This is my 2nd W2600HP that has disappointed me, and I'm not sure if I want to try a 3rd when I see what their quality control is like. I would have bought it locally if I could, but I live sort of in the middle of nowhere at the moment, so that's not an option for me.

I realise there are no other options in this price range. Believe me, I've been sitting here all day looking at my options. I'm going to have to step up in price and get something else. Right now the 24" NEC 24WMGX3 looks tempting, but I'll lose 1,5" so I dunno. We'll see. It's a damn shame, because I'm sure the screen can be fantastic if you get one without issues!
 
I'm lucky then, my 2nd display is perfect. (build feb 2009)
No backlight bleed, no strange stuck subpixels, no dead pixels, no humming from the PSU, and the panel itself isn't loose when i press on it at the top. (although i didn't use that much force)

I've done all the lagom.nl calibration tests and this panel is really great.
Third time's a charm, so i would go for a third.
 
Hah well, the thought has struck me. But I've spent alot of money shipping these things back and forth now (they're big and heavy) so I think I'm gonna call it quits before I get really angry. If I could get one locally I would definitely do that, and that way I could probably get one that's perfect. But I have to say, LG's quality control leaves much to be desired. I'm currently eyeing out an Eizo that fits my bill perfectly, well, except the price of course.
 
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