Previous 1 2 3 4 Next 321 Replies Latest reply: Jul 9, 2009 11:41 PM by Stephen Heward Go to original post Branched to a new discussion.
  • mattnedgus Level 1 Level 1 (25 points)
    Same here. I already stumped up the extra £200 in cash to move from the 20" and buy the 24" - but another £50-£100 for a consistent screen contrast and peace of mind would have bordered on acceptable.

    I bought and collected this 24" on the 25th August here in the UK.

    The 20" that I returned the same day was bought and collected on the 16th August.

    My girlfriend has the 20" still and says she doesn't notice the horizontal gradient as much, despite my pointing it out. I bet the same case is true of the 24". Because (like I was) people are so pleased with their shiny new Apple that issues such as screen contrast and colour can go unnoticed, at least initially. I also suppose it depends on how concerned people are with the colour/ contrast issues. Some people who notice might just ignore it - like I'm trying so hard to do.
  • Todd Ryckman Level 1 Level 1 (125 points)
    There are a number of threads about this issue here and on other boards. There are several posts on MacInTouch that detail the same issues people have shared here. It's one of those things that you don't notice until you notice it. I don't think I would have ever have seen it until I read a post and actually started critically looking at the display. Once you know what to look for it's very obvious. Like others, I have found it is much more obvious when the brightness is turned down a couple of clicks. Many people have shared that they returned to their nearest Apple store only to find that almost all of the demo machines they looked at displayed the same problem to one degree or another.

    I am very interested to hear the experience of those who have returned their machines and are waiting on a replacement.



    Here are a couple of other threads:
    http://discussions.apple.com/message.jspa?messageID=5156917#5156917

    http://discussions.apple.com/message.jspa?messageID=5155015#5155015
  • mattnedgus Level 1 Level 1 (25 points)
    I came across this forum whilst browsing the Apple Discussions:

    http://forums.macrumors.com/showthread.php?t=344204&page=2

    It sounds like the panel should be a very high quality panel - a H-IPS to be precise. This one, suggested by a poster on the forum:

    http://www.necdisplay.com/Products/Product/?product=a46240bd-a846-4de7-b644-bd7f 0b7e6ece

    $1500 retail seems pretty expensive for a panel used in this 24" iMac.


    If you read the blurb it talks about colorcomp technology and x-light pro backlight/sensor design. If this is indeed the panel used in the 24" iMacs, could these new 'technologies' be the cause of the dark patches posted here?

    Message was edited by: mattnedgus
  • Fred Williams1 Level 1 Level 1 (0 points)
    I did receive a replacement 24" white Intel iMac last Friday. It had the same problem with uneven screen illumination when I used a grey desktop (lighter on left side than right side). The area with a very slight yellow tinge was perhaps smaller but still present (lower center), and I could not lower the brightness enough for proper calibration. I shipped it back today. The support person did know about display calibration and he also said he had not heard of this problem before. He convinced me to try a third unit. I will let you know what I get. I'm not optimistic, but the alternatives are not good.
  • cjpops Level 1 Level 1 (0 points)
    I'm picking up my 'third' replacement tommorow night so hopefully its ok.. will let you guys know.
  • Peter Mars Level 1 Level 1 (130 points)
    Edwin, sorry for the delay in getting back to you. I had been able to increase the brightness a bit and get less of an differential across the screen, not perfect, but better. I was also able to get a pleasing profile with the profile assistant (built-in calibrator)

    In the end... I returned the iMac... the whole thing was just too annoying and stupid.
    I now have a Mac Pro and a dell monitor (2407WFP-HC, which is not perfect either, but works and looks much better over all) I also purchased a Huey Pro for calibration... no problems so far.

    Only thing I don't like about the Dell 2407 is the viewing angle is easily not as good.

    Apple got it half right in my opinion. Excellent machine and amazing design, the monitor is fantasticly clear and sharp with a glossy finish, but they used less expensive B grade panels. I have now compared 10 iMacs at 3 Apple stores and all have the exact same brightness problem... dimmer to the right. So close, yet so far!

    One thing I did noticed while comparing various sized Apple monitors and iMac screens at 3 Apple stores is that the only monitor I would consider perfect in terms of color precision and uniform brightness is the 30 inch cinema display. It is truly an amazing accomplishment!
  • Peter Mars Level 1 Level 1 (130 points)
    I tried really hard to figure this out and decided I just could not live with it. Managers at 3 Apple stores just kind of scratched their heads when I demonstrated this to them on their in-store machines. I have also reported this to AppleCare representatives who had not heard of this. I was walked thru a few procedures for resetting modules and PRam etc... didn't work, the customer rep said they were making notes about this.

    So, it is obvious to me that Apple knows about the lousy screen quality, and the glare issues a few are having. They could have sold a million of these if only they hadn't been greedy and short-cut the quality of the screens. Something has got to change very soon, or this will be a large financial disaster. I just might have to sell my 135 shares of AAPL stock before this gets any worse
  • glyphis Level 1 Level 1 (100 points)
    Hi Peter

    Your problem isn't a new one, and has been documented on these discussion boards with the white iMac 24".

    I'm on my 14th replacement machine. 11 of them had a similar brightness & discolouration issue to yours and the other iMac owners on here (2 had hard drives that failed within a couple of weeks). Apple were very good at replacing the machines; I said it wasn't fit for purpose.

    My 14th has been ok so far, though I have noticed that the screen is starting to show a gradient from left to right. I can live with it. I've been down the Cinema Display route already... and 3 pink 23" screens later had to downsize to 2x20"s to have any chance of a colour-accurate workflow.

    I'm sure there are iMacs out there with good screens... and I'm really shocked and surprised to hear that this problem hasn't been resolved in this revision. I'd recommend getting on to tech support and asking for a replacement unit - it's really not acceptable.

    Good luck!
    Scott
  • ralph.s Level 1 Level 1 (0 points)
    got my second imac 24 today. And the same: left more blue and brighter als right. Looks like all 24'screens have this issue more or less.
  • Nemerov Level 1 Level 1 (20 points)
    Same issue here, especially when the screen is cold. After a few hours, the screen is quite homogenous...
    And can I ask you if you all have this issue or is it an exception ?
    http://discussions.apple.com/thread.jspa?threadID=1094556&tstart=0
  • ralph.s Level 1 Level 1 (0 points)
    Found something special out! I own a Spyder colorimeter so i can measure the display out. The uneven brightness happens only if brightness settings is on low. With full hardware brightness the screen is nearly homogenous. But this is too bright for me. The solution is "Shades" to dimm the brighness down!
  • rainydays357 Level 1 Level 1 (10 points)
    I got my replacement today and it's got the exact same issue. I don't get it. How can Apple just keep replacing these machines? Is it cheaper for them to do so than to actually fix the problem?

    Has this issue been brought up on any news sites? I think it needs to get some attention really.
  • Peter Mars Level 1 Level 1 (130 points)
    Yes, this is very annoying. I wanted to keep mine soooo bad... but I just couldn't!
    As I've said before, I love the brightness and sharpness, it works good for me, but the inconsistent illumination is a deal breaker.

    Our local Best Buy starting carrying Apple computers this week and guess what..... the 24" iMac on display has this same problem. That makes 3 Apple stores in my area and now our local Best Buy, all with the same screen problem. Perhaps Apple doesn't consider it a problem, or doesn't think people will notice?
  • rainydays357 Level 1 Level 1 (10 points)
    Yeah I love the screen otherwise, but this issue makes it look dirty. Especially with solid colors.

    This screen is better than the first one I got though. And there's absolutely no backlight bleeding. No dead/stuck pixels either. The machine is working great. It's just that one annoying issue that I'm constantly aware and reminded of.

    I've been thinking that I should just settle for it. But at the same time I just can't. I can't pay this much money for something that is essentially broken.
    At least if I can trust the people that are saying that they don't have this issue.

    If all the screens are like this then I could at least stop the replacing madness and either keep it or return it and get my money back.

    Do you think Apple will let me keep this one until my replacement is at least shipped? The 2,5 weeks without a large monitor was very difficult for me and I had to postpone projects and explain it to my clients.
  • Peter Mars Level 1 Level 1 (130 points)
    The choice is an individual one... it's a subjective matter. I personally was losing sleep and wasting far too much time worrying about it, so I took it back within a week. Maybe one day it will be in the cards for me to own one. Just not right now. Not until they improve the light distribution across the monitor panel... some can live with it I'm sure. Good luck with your own decision.
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