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

You'll much better off with a Dell U2410 or even better with an U2711.
I m about to recieve my 5th iMac tomorrow and after the 3rd with massive yellow tinge,
I decided to purchase a second display for my photoediting. The U2410 is by far better than the iMac, despite the yellow tinge. The Dell covers more colors and has the better picture overall. He is not as bright as the iMac, but for serious pre-print work, you have to dial down the brightness anyway though.

I even thought about getting a refund but the i7 is still a decent machine, so I ll play the exchange game till the end...

Thanks for the advice. I will strongly consider the Dell monitors you mentioned. I want to minimize the risk of a defective display and I do not want to wait for the revision. There is no assurance the revision will be trouble free in any case if the problem is with the new technology or how it interacts with shipping and handling. I too very much like the concept of the i7 but the execution needs to match it. There do exist high quality monitors out there without yellow tinge or grey bars, so Apple can make this happen at some point.

OK. I've been following this thread for quite some time. For those of you that have contributed much time and effort, my sincere thanks for your efforts.

I have been considering a purchase of the 27" I5 but have been holding off because of this issue. Will primarily be using it for my photography hobby. So, I need a decent processor & video card and certainly don't want a sub-par display.

I've looked at the 27" models in multiple Best Buy stores, the local Apple store, and another reseller. I've got to admit that when I play around with these machines in the stores, I have a very difficult time seeing any color variances. However, I thought I did see a bit of a faint yellow tinge in the center and bottom middle of a C2D screen today in a Best Buy. But, my son didn't see it.

I'm curious as to whether most of you on this thread saw the tinge prior to doing a Dino test. If the answer is "no", then I may just go ahead and pull the trigger. After all, if it's something I'm not going to notice...

I would appreciate your thoughts. Thanks in advance!

Most everybody knew there was something different in their screens after seeing Grey Test, my Test Just confirmed it was definitely there. Confirming that it was not your imagination & a definite problem. Anyone sitting on the fence who was not sure, after the test, was sure. But again, my advice has always been, if you just see it in Grey Bar Test & not in your Full Screen Browser or in any other App, then the iMac is a keeper. Especially if your not a Graphic Artist or a Photographer. I did the Grey Bar Test & my iMac has a Color Variance, but it only shows up in the Grey Bar Test, no where else. I'm keeping mine. No screen replacement, nothing. I'm done!

Well, I decided to make the hour long drive back to my nearest Apple Store today where I showed the Genius Bar staff the display that they had replaced for me yesterday. I asked the Genius to take the machine in the back and look at it closely with the brightness turned down to half maximum in subdued ambient light. She returned a few minutes later to confirm what I observed: the bottom half of the display was slightly yellow. I reconfirmed with the Genius that this was supposed to be one of the new re-engineered displays, but I remain skeptical. Was it really a new display, or is there even such a thing? Regardless, it was a bad display. The Genius asked me if they could use my colorimeter to test one of the displays in the store which I agreed to. We tested a 27" floor model. There was very close uniformity in the left upper and lower quadrants as well as the right lower quadrant. The right upper quadrant was significantly toward the cooler side by almost 800K. There was definitely no yellow tinge, but the display's white point was set closer to 7000K for some reason. The Genius told me that floor model was one of the new models that replaced the batch of bad displays.

Anyhow, the Genius offered to return my bad display and exchange it for a brand new BTO i7 like the one I had. I am nervous about getting another bad machine, but I will try an exchange once. If that one is bad, then I will ask for a refund.

Well at least they didn't argue with you. They saw the problem. That's good. It's worth trying the exchange. Good Luck, mstrammd!

Hey Guys,

Had sort of ducked out of this for a while as had decided that the refund I'd been offered was the only way to go. However I have now had ACS on telling me that this issue is now 'Definitely Fixed' -although they can't tell me what's been done to fix it.

Having trawled through the last 8 pages or so, it seems that faulty iMacs are still being shipped so I'm more than a little wary of agreeing to yet another replacement (it'll be my 5th).

So I suppose I'm trying to gauge public opinion, what do you reckon ? -take the risk or go down a different route ?

Cheers

R.

Why not wait another month or two? Hopefully, you have AppleCare. If there is a "fix" it will materialize soon. If there is not, it will become obvious with the near term passage of time, since they are claiming they have a fix. I cannot for the life of me understand how and why it has taken this long to address the problem given the importance of the iMac. On paper it is a dream machine. And it is not like we have a lot of choices here. On the one hand you have the Mac Pro and on the other is the Mac Mini. The iMac seems perfectly suited for those of us in the middle and is a tremendous "bargain" to boot. That is why logic would suggest those who can do so wait a little longer, particularly if you are vested.

Remember, the pages we are reading represent a tiny subset and a very small fraction of the total population, particularly given the number of "repeat" contributors. Where are all the others? Either they are perfectly satisfied and do not know better without the grey bar tests, or this group is "snake bit." I suspect the significant majority of iMac customers are happy with their machines.

I will stay tuned as I am looking to buy one myself, but I can afford to wait for a few more months, if necessary, assuming my iMac G5 for the family holds out...

Richard, It's NOT Fixed! Read the last 10 Pages of this Thread! The Yellow Tinge Is NOT Fixed!

mstrammd wrote:

The Genius asked me if they could use my colorimeter to test one of the displays in the store which I agreed to. We tested a 27" floor model. There was very close uniformity in the left upper and lower quadrants as well as the right lower quadrant. The right upper quadrant was significantly toward the cooler side by almost 800K. There was definitely no yellow tinge, but the display's white point was set closer to 7000K for some reason. The Genius told me that floor model was one of the new models that replaced the batch of bad displays.

Hi mstrammd,

So they borrow your 'Spyder 3'
I'm just wondering how they perform their previous extensive testing ?
Maybe they know the excellent 'Dino test'.
So they change the white point to 7000K. If this set up the only thing they change on the panel, no yellow or pink at bottom but blue (icy white) at top. I did it on my unit, but didn't keep it.

BTW (to Dino) the criterium 'just see it in Grey Bar Test & not in your Full Screen Browser' does correspond precisely to 300-400K average - top to bottom (top being at white point).

Cheers!

Did you happen to notice which week the so claimed fixed iMac was? I actually don't think the fixed iMac's are different in anyway to the old ones. I just had a screen replacement and was told it was different screen to the original. Looking into it its just a replacement part number instead of the OEM one.

I am taking my iMac back tommorow for a refund as I just had another screen replaced and it still has the same problem. Visable yellow without the bars test 😟 So I am leaving this iMac roller coaster for the time being.

I have a feeling Apple's Test is just them looking at the Screen. No Grey Bars or nothing. I wish they would use the 30 Second Copy & Paste Test. I don't know the Technical but your saying there 300K-400K Average Difference from Top to bottom & from Left to Right, correct?

fyi - I have been worried about buying a new iMac due to this issue. I finally bit the bullet and ordered, it came yesterday, and the screen is great. No yellow, no flickering. Hopefully everyone with an issue gets it resolved asap.

thompsrr, I don't know if this is your first post here or if you read through some of these posts. But just coming out & saying you have a Perfect iMac, is not going to hold much weight here. Since all the people who had made this same claim, realized after doing a Grey Bar Copy & Paste Test, that their Screen was not in fact Perfect, as you say. There is a Color Variance on all the Screens we have ever seen posted. Of course some, refuse to do the test, so they live in denial. But in order for anyone on here to believe your screen is perfect or not, you'd have to post pictures taken with a Camera, not a Screen Capture. Again, If you think your screen is Perfect & don't want to run any Tests, than by all means we understand. But no one on here can make a Claim of having a Perfect Screen. Period. Because, you know what? We have never seen a Perfect Screen. Only people that THINK they have a Perfect Screen. Eg. My 3rd iMac when surfing Full Screen in Safari shows no Yellow or Imperfections. As soon as I put up the Grey Bars, I realized there was a Color Variance on my Screen from top to bottom & left to right. If you don't have a weak heart & feel brave, here is the true Test to try. Good Luck with your new iMac.

Grey Bar Test:

Take a picture with your Camera of the Horizontal Grey Bars & another Picture with the Vertical Grey Bars.
Theses bars can both be found Here:
http://tapplox.com/imac-led3.html
http://tapplox.com/imac-led2.html

Copy Both Pictures from your Camera to your iMac.

Open Up your picture you took in "Preview"
With the Mouse Select the entire Left Grey Bar
Go To File, Copy,
Go To File, Paste
Now Drag the Copied Section to right next to the Right Grey Bar
Go To File, Paste
Go To File, Save As…
Give the Picture a NEW Name

* Do Same with Horizontal Grey Bars.

Hi, thompsrr! Great news!

Do you mind posting some photos of your display here? Preferably, with the "30-sec Dino's test" performed on them.