Yellow tinge from bottom to top of the screen, 27" iMac

alma, Good Luck. It's funny how Apple promised it would Definitely be fixed & then switched your AASP. Screen repairs have had the best success rate. Let us know!

zmippie, Nice Job. Excellent way to present to Apple. You take the Copy & Paste Method, one step further!

Thanks Dino. I'm glad to see Apple is responding, but if I understand correctly, it took a while. We've seen that happen before, but it usually pans out pretty well. I created the Apple Time Capsule Memorial Register last October:

http://timecapsuledead.org/

...and Apple is replacing failing Time Capsules now, just like they're (hopefully) fixing the yellowish screens.
I'd love to see people posting their results after their screen has been repaired. Is there already proof of that this works? (I know, I have to read up on this thread better)

zmippie, Wow! I bought the older Time Capsule last June from B&H in NY. Mine has been going strong for 8 Months. I'm not sure I even Registered mine. Did they just Die? What do you suggest? Sorry for Off Topic.

zmippie wrote:
LEDs are known to perform very different under varying temperatures (emitting less light when they heat up), and depending on which components (hard disk, GPU, etc) are in the vicinity of a certain LED, they might perform much differently from eachother.

Very interesting indeed!

If this is the case, how can you avoid different parts of the screen being exposed to different temperatures in an "all-in-one" (at least without a complete re-design)?

But I still have some doubt about this hypothesis: being each pixel composed of three (RGB) LEDs, if all of them emit less light the result is a very light grey instead of pure white, but still a neutral color.

Since we observe a color shift (towards yellow) that means that the balance between the three RGB components is altered, as if some LED colours were more sensitive to temperature changes than others. Can this be the case?

Here is my screen after the technician told me to do the firmware a both photos are there.

update. http://imgur.com/7Wpio&rOBGm

What Firmware? The Graphics & Display Firmware Update? They both only fix Screen Flicker & will not help the Color Variance & Yellow on your Screen. The Tech SHOULD have known that!

this is my 5th iMac and is a week 8 made in the US.

At first I thought it was perfect or at least acceptable, but with my 14 day return period fast approaching, I began to look harder and now am unsure:




Message was edited by: tjtoed

PaoloS wrote:
Since we observe a color shift (towards yellow) that means that the balance between the three RGB components is altered, as if some LED colours were more sensitive to temperature changes than others. Can this be the case?

PaoloS,

That's close IMO:

See point #0013 of the US Patent 2009/0135583 that I posted earlier (regarding Apple's Display LED backlighted system).

http://files.me.com/jacques.laporte/uv9ymb

The color of each LED depends on temperature and "difficulties in providing proper thermal management capabilities *can readily lead to temperature variations across the distributed array of LED light sources .... such non-uniformities lead to unacceptable variations in color from one portion of the screen to another*"

(my underlining)
(page 1 and 2)

Bottom Bar is Darker Shade with a Hint of Yellow. But what you have to ask yourself is, do you see any Yellow or difference in the Screen when you have Safari Opened Full Screen (entire Screen)? Or in any other Apps like Finder, etc...If you don't & your not a Photographer or Graphic Artist, you'll probably be fine. For instance mine has a Color Variance with Grey Bars Up but in all my Apps, I can't see anything different side to side & up & down on my Screen. So I'm keeping mine. I had 2 iMacs Previous, where I actually saw the Yellow is several places on screen. I could not live with THAT. I just kept looking at the Yellow spots until it drove me crazy & I exchanged them. 🙂

My iMac c5 8gig, computer's "teeth" are yellow and now there are several grey dots at the top right of the screen along with many blurred-fuzzy lines. Anyone else have a "music" page burned into their screen? This just appeared, or I noticed it, last week. Definitely not there a few weeks ago.

OK, I just got my week 9, and the machine still has a horrible color temperature gradient. This is the 5th out of 5 screens I've seen that have the tinge, and I feel Apple is far too incompetent and focused on stupid little gadgets like the iPhone and iPad to every properly resolve this problem.

Message was edited by: Avinash Vakil

Here are more Tapplox LCD screen test pics "a la Dino" ( http://www.flickr.com/photos/faxao/sets/72157623410938691/).

Both of them have been shot RAW with a Nikon D300 and a Nikkor 50mm 1:1.8 lens mount (pretty good lens) and then converted into JPEG.

There is certainly some degree of color variance that, IMHO, is way more visible looking at the pics rather than looking at the screen with my eyes.

This tinge saga has been discussed thoroughly in this thread and I guess that now that Apple itself (finally) has recognized the problem we can be sure that whenever a solution will be found (most likely a new LCD panel provider....) we are all entitled to have our screen replaced by Apple Support service.

Take care

Today I went back to the Apple Premium Reseller and after 1,5 hrs in the Repair section of the store, they decided that my iMac had a screen issue and offered to keep it for a day, waiting for Apple's reply on it, as they don't have any official info from Apple on this issue yet.

It's probably because my screen is a 21,5 and it's more common with 27'' ones.

Anyway, the new one has exactly the same issue: on a white background you can see a yellowish halo.

This is a result of a test:
http://i.imgur.com/n58HP.png

This is how bad it looks with a grey background...
http://i.imgur.com/ytTAK.jpg

In addition to all of this, it suffers from backlight bleeding (my old one did not).

I really want to return it and have my money back. Too bad things like these are not that easy in my country (Italy).
How does Apple usually behave in situations like this, for purchases made at an actual shop (for online purchases there should be no problems)?
Does the fact that it is an Apple Premium Reseller (and not an Apple Store) make a difference?

faxao, just like Mine! Darker Right Side & Bottom Grey Bar! After seeing most pictures, I would say MOST have the defect in those same 2 areas. As far as Apple finally getting a handle on this. I see no indication of any Hope coming our way. When people are still getting Week 09's & new Screen replacements, worse than their last, I don't see how you can call that a progression in the right direction. I think we are worse off than we ever were. Until I see Perfect Screens posted & less defect posts, I cannot be optimistic. I've been here a long time. Many have come & gone. Some got good screen replacements or screens that were more acceptable & just gave up the good fight.