A couple of posts from iPhone 4S users on MacRumors.
QUOTE(ithing;13730939)
CONFIRMED: my 4s's yellow screen is definitely fading!
Received mine on 10/20 and today's 10/26. Comparing to my brother's 4 it definitely had this yellow tint problem. I was going to ask for a replacement right away but many people said replacements also had yellow tint, and I didn't want a refurbished one since the one I have right now have pretty good backlight and zero dead pixel.
6 days later, I definitely see that the yellow tint has faded. I put 4 beside my 4s in completely dark room, maximum brightness, auto brightness off, and I no longer see white as yellow. 4 got cooler color but the white background even seems a little blue, rather. What's important here is that the severe yellowness actually goes a way with time. Trust me, it's not my eyes accustomed to this new screen.
Here is what I did:
-I found displayed 4s in Apple Store usually do not have yellow screens (some actually did). I confirmed with a friend who works @ genius bar that they don't purposely select good screen to the display. They just pull randomly selected 4s's out of delivered boxes and put them to display.
-It is true that displayed 4s's in Apple Store got settings set at maximum brightness and auto brightness turned off. And people touch them all day long so screen is almost always on.
-I did the same: For the last 3 days I set the brightness to maximum and turned off the auto brightness. I even brought on pure white wallpaper photo, no auto-lock, and kept the display on for 2-3 hours every day (for the last 3 days). Also played some videos in full screen as well even if I wasn't watching it. Basically I tried to keep the screen on the maximum brightness as long as possible.
Now, I no longer find my phone to be yellow. I believe if I keep using the phone on the maximum brightness for the next few weeks it will get better (though I'm already satisfied with my current screen).
IMPORTANT: Also, when you compare your screen with others, make sure the screen protector is off, especially the anti-glare or anti-fingerprint ones. They DO make your screen look less sharp and some even give yellow color.
Lastly, when screen is seen from the left it's more yellow than facing from the front. When seen from the right, it's more blue. I checked most of 4s from the Apple Store displayed ones, they were all the same in this aspect. My friends' and family's 4's all got this viewing angle difference.
I hope my observation and experience have helped you a little.
QUOTE(catalyst6;13732396)
I can't believe I'm honestly saying this, but the yellow does fade.
I have also been running my brightness at full blast for the past few days with autolock off and the screen is definitely becoming more neutral. I'm a display snob and calibrate everything, I understand how LED backlighting works and why we get colors we get. I just assumed the color temp on the phone was overly warm and this "glue" nonsense was ********.
It's warmer than my iPhone 4.....rather my iPhone 4 is ridiculously blue and I never noticed it. It makes the UI look good, but everything else is flat. The only issue I'm having now is that the backlight/color is a little uneven. More pink on the left and more green on the right. Hoping this evens out too.
Guys please try the method I suggested earlier if your screen is yellow. Here it is again for those who missed it
1. Charge your iPhone.
2. While charging, set brightness to max and off auto brightness.
3. Go to Settings and change auto lock to Never.
4. Go to any screen you desire and leave it.
Leave it for an hour or 2 straight and see if the color tone of your yellow screen improves. If after a couple of days and still no improvement, bring it back to your telco for a warranty change.
This post has been edited by sigheart: Dec 16 2011, 12:44 PM