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I feel like I've seen enough of a sample size (granted, not the largest) first hand to say that the vast, vast majority of units, have this tinting in at least one of the three colors (yellow being the most common, pink second, blue/green third). I figure your chances of getting a completely tint free unit at this stage lies at around 5%.

The best thing to do is going to be to swap until you find one tolerable and then swap in a few months time.
 
My experience with this issue

Hello guys,

I've decided to post today my experience with this "yellow tinting" issue. I'll explain why.
I got my new iPad at launch day from a major Greek store. It was my first ever iPad. After one week of just admiring its screen I noticed that the upper third of the display (near the FaceTime camera) was tinted noticeably more yellow than the two thirds below it. It was more obvious in split keyboard mode (landscape). I'm not at all sure that the issue wasn't present from day 1 or it came apparent after the first week but the fact is that I noticed it only after a week. I began searching for others experience and I got terrified reading online a series of defects, people stating that they have exchanged thirteen iPads (!) etc so I was really confused as to whether I should give it for an exchange or not. My fear, of course, was that I could get an iPad worse than the one I was giving. I also couldn't estimate the perentage of perfect iPads out there. At last, I thought I'd give it a try because I couldn't help staring at the issue. Today I received a new iPad as an exchange (new, not refurbished) and its display is for the time being really really nice. It doesn't have visible unevenness or major bleeding, the iPad doesnt have other issues either. People at the Greek Apple premium reseller (not an Apple Store) were nice and quick with the exchange and admitted with no hesitation that there was an issue with the first iPad.

My point is that if you think that some issue with your iPad is annoying you, don't hesitate to give it for an exchange. It is too awesome and expensive to have flaws. On the other hand don't go OCD looking for defects because no electronic device is perfect.

Read forum threads with skepticism. Always keep in mind that ones posting at a certain thread concerning a technical issue are the most unfortunate of our friends. The vast majority just enjoys their iPads so the sample is not representative. Do not fear that all iPads have issues. Even I, who had an issue with the first iPad, today being completely satisfied with the second, wouldn't have posted if it weren't to help you see things more vividly. Hope I did! cheers.
 
My iPad 3 was perfect when I bought it, no display issues.
Today, I had it exchanged because of issues with the Home button related to the 30-Pin Connector (some sort of intermittent short).
The replacement iPad 3 has a more yellowish tint on the top area, more towards the left side (when holding it in portrait position).
I really hope it will go away over time.
 
So annoying considering it's all about the Retina Display.

You know, given that it was the only real distinguishing thing from 2 to 3, and now that the 4 is called 'iPad with Retina Display' (even though A6x/Lightning/iSight is an added perk) instead of 'New iPad'
 
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