Additional "facts" FYI.
Link: http://forums.macrumors.com/showthread.php?t=824940
Helpful and Diagnostic Information:
1. Yellow Tinge is a color uniformity issue for both 21.5" and 27" iMacs
2. Not everyone have the issue, but it is extremely common.
3. There's a difference in severity of yellowing. Some reports cite that yellowing worsens over time while there are some that said it had remained the same.
4. The issue is NOT a backlight leak nor backlight inconsistency. This is a color inconsistency issue. If you desaturate photos taken of the yellow tinged display, you will see even backlighting.
5. It is not GPU specific. Reported issue seen on Nvidia 9400M, ATI HD4670, ATI HD4850.
6. It is not CPU specific. Seen on Core 2 Duo, Core i5, Core i7.
7. It does not affect External Displays, only present on the iMac 21.5/27 display.
8. Also occurs in Windows running in Bootcamp, so it is very likely a hardware defect.
9. PRAM reset does not help. Reinstallation does not help.
10. Issue remains regardless of brightness level.
11. Issue remains regardless if display is near speakers / magnets.
12. Issue remains regardless of viewing angle. Looking directly, up or down or from the side. Watch for it carefully.
13. Some displays may have more yellowing on the left, center or the right side of the affected area (from mid towards the bottom).
14. Some of Apple's 24" LED Cinema Display also exhibit this issue.
15. First batch of refurbished 21.5" iMacs also exhibit the issue.
16. This is not a discoloration of the glass itself.
17. The firmware update from December 21st 2009 does not fix the issue.
18. Previous generation 24" iMac's yellow tint issue, link, is similar but goes horizontally across the screen.
19. This may not be a LED problem.
20. The firmware update from February 2010 does not fix the issue.
Be happy. Ta.
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