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Old Jan 27, 2011, 12:41 AM   #1
Andylar
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27" iMac Screen stain/discoloration

Hi All

Bought a refurb i5 2.66ghz 27" at the end of last september, had to have the screen replaced about a month and a half later, now the marks in the top left corner have reocurred in the same spot. Is this a problem from heat from behind the lcd or what is it ?

also has anyone successfully had their imac swapped because of this issue ?

Im just about to have the display replaced for the 2nd time

picture below

all advice and help appreciated



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Old Jan 27, 2011, 03:35 AM   #2
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This seems to be an issue which is starting to appear for iMac users who have had the system for a while - there has definitely been an increase in threads / posts in the last month or so. In an increasing number of cases Apple seem to unfortunately be claiming "environmental issues" with respect to the location of the computer and claiming it's not covered by their guarantee - what are we meant to be do, keep the iMac in an airtight bubble? Personally I believe it's a case of an under engineered chaisis - combination of heat dissipation and dust being sucked up by the fans which enter the LCD array from the rear - possibly if they had fully isolated the screen component from the computer / fans it may have prevented this issue. Unfortunately Apple's pursuit of the slimmest all-in-one seems to have consequences.

Check these links out:

http://forums.macrumors.com/showthread.php?p=11530153

http://forums.macrumors.com/showthread.php?t=861355

http://forums.macrumors.com/showthread.php?t=1082976

http://forums.macrumors.com/showthread.php?t=1056817

http://discussions.apple.com/thread....0580&tstart=15

http://discussions.apple.com/thread....4482&tstart=90

http://discussionsapple.com/thread.j...5426&tstart=45
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Old Jan 27, 2011, 03:42 AM   #3
Andylar
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its twice happened me after a month and a half on each occasion,alot sooner than the other posts ive read
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Old Jan 27, 2011, 03:44 AM   #4
Macs4u
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Mine does the same. I called the Apple store to be told "keep it dry, dust free and it will be fine". Very arrogant response. Ive just spent 1700 on an imac and im supposed to just make do. No thanks. Ill take it back, spend half on a PC and spend money with a company that actually gives a damn about its customers. Apple have changed for the worse. They no longer act the way they used to. Due to the popularity of the iphone/ipad etc they think they can just do what they want.


Apple have always in the past got away with charging a high price in the UK as they have always added excellent customer services as value. Now with that faltering, the price is just way too high to be told "just make do". 1700 in any way shape or form is alot of money to buy something that is technologically slower than the equivalent in PC terms and also not working correctly.


Matt

Last edited by Macs4u; Jan 27, 2011 at 03:50 AM.
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Old Jan 27, 2011, 05:49 AM   #5
Grolsch30
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Like I said on another thread, of the 5 iMac 27 i5's I returned three of them had this issue from the outset, also light leakage has been an issue on all of them.

Needless to say went for a refund and waiting what a refresh brings on the iMac but I am also looking at the mac mini once that gets a refresh with the 27 inch display as I have not heard about any issues relating to the display.
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Old Jan 27, 2011, 06:46 AM   #6
Andylar
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is this just an issue with the old imacs or even the latest line of them ?
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Old Jan 27, 2011, 06:55 AM   #7
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After reading alot about this my impression is that this has been affecting some imacs the last few years. I think like many others it's because of heat from the machine (esp. the GPU) or direct sunlight. I think the higher performance and bigger screens have shown the iMac design to have a flaw. Using smcfancontrol to keep the temps ok should prevent this from happening if it's just a heat issue.

I'm really interested in knowing how the environment temps are, and how exposed the screen is to direct sunlight, which according to many articles is very bad for the iMac.
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Old Jan 27, 2011, 07:00 AM   #8
Andylar
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well mine is used in a bedroom in ireland, so its never overly warm, also direct sunlight has never hit it !
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Old Jan 27, 2011, 07:01 AM   #9
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ahhhh not this again
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Old Jan 27, 2011, 01:09 PM   #10
Andylar
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spoke to applecare and they are already trying to pawn this off on enviromental factors, has this happened to anyone else and if so what did you do ?
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Old Jan 27, 2011, 06:42 PM   #11
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Quote:
Originally Posted by Andylar View Post
spoke to applecare and they are already trying to pawn this off on enviromental factors, has this happened to anyone else and if so what did you do ?
Yep, that's what they said to me. Stand your ground as this position Apple is taking is not acceptable.
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Old Jan 28, 2011, 12:37 AM   #12
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Quote:
Originally Posted by Andylar View Post
spoke to applecare and they are already trying to pawn this off on enviromental factors, has this happened to anyone else and if so what did you do ?
See my thread here:-

http://forums.macrumors.com/showthread.php?t=1082976
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Old Jan 28, 2011, 04:33 AM   #13
Grolsch30
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As there does not seem to be any issues of this sort with the 27 display I will be looking at the mac mini option with the display after it's been refreshed now.
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Old Jan 28, 2011, 09:58 AM   #14
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it's not just the iMac with this problem, Samsung flat screen TV's are having the same kind of problem
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Old Jan 28, 2011, 04:53 PM   #15
ShStylo
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hey OP,

I had the exact same issue with my iMac maybe about half a year ago. I brought it into a Mac reseller in my area as there is no apple store around me. The guy looked at it and replaced the entire LCD within couple business days.

If your apple store won't replace it for you, perhaps talk to a reseller?

BTW the new LCD I got has a bit of a yellow tint at the bottom, but it's been so long now I barely even notice it. Hope that helps.
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Old Jan 28, 2011, 05:34 PM   #16
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My iMac, 27" 2.66 i5, has a small bit of yellow discoloration at the very top right of the screen. It is so slight that it is barely noticeable, unless you know it;'s there and look for it. The more common problem seems to be the light leakage from the backlight that bleeds through the corners of the screen.

I was frustrated at first with the problems of the screen, but have basically overlooked them since I bought the computer. Overall the screen is still very high-quality, and that the slight screen imperfections don't detract from the overall enjoyment of using the iMac.
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Old Jan 29, 2011, 06:34 AM   #17
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I just purchased an i3 27" iMac and I'm noticing some differences in temperature vs. my 21.5" 3.06 C2D iMac.

Most notably is the difference in idle GPU temperature. I mean, we're talking a 10C difference with the 27" being cooler.

27" 3.2 i3 w/ ATI 5670 = 45C idle
21" 3.06 C2D w/ ATI 4670 = 55C idle

If I understand correctly, the GPU is what generates all that heat in the upper left hand corner of the iMac, the same location where most people experience screen discoloration. (FYI, I've had the screen replaced once for discoloration and it's starting to show again)
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Old Jan 29, 2011, 07:55 AM   #18
Andylar
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just brought my imac back to the store to have the screen replaced, every 27 inch imac in the store was suffering from the same problem/marks on the screen

sales assistant got rather tongue tied when i asked him what the marks where
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Old Jan 29, 2011, 09:57 AM   #19
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I went to my local apple reseller today, who almost only sell apple products. None of the displayed models had any issues with the screen, I checked for everything. I also spoke with a guy in the service department about it. He said the yellow tint thing was fixed in august after a major wave of problems. He wasn't too busy fixing iMacs nowadays. The models before that has some kind of film in the screen, turning parts of it yellow if the machine is handled rough (shipping for instance).

He had seen some cases of black dots like described many times on this forum, but according to him it is very unusual - especially if purchased recently. He also said that if such a thing would happen to your screen they will change it no questions asked. In Norway they do this for 5 years after purchase.

Of course you could question his honesty on the matter, but why would he lie about it when I'd already pointed out that my iMac was purchased elsewhere?

My point is that the the issues described here isn't a dealbraker if you consider getting an iMac today. Another thing is that they can't pin the dots on the customers environment - you are all entitled for help if you're within apples 1 year warranty, or if the warranty is extended by law in your country.

Hope this helps. Good luck!
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Old Apr 20, 2011, 12:32 PM   #20
sweet160
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screen is replaced

Hi, they {apple reseller} very kindly replaced the screen of my imac today, I can now get a 2 year extension of my warranty or just hope that the problem doesnt repeat itself, what do you guys think...
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Old Apr 20, 2011, 01:42 PM   #21
Chris5488
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screen replaced and extra warranty! Good for you

I wonder what they would do if you had Apple Care...
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Old Apr 20, 2011, 02:26 PM   #22
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Quote:
Originally Posted by sweet160 View Post
Hi, they {apple reseller} very kindly replaced the screen of my imac today, I can now get a 2 year extension of my warranty or just hope that the problem doesnt repeat itself, what do you guys think...
I'm assuming you mean you're at the end of you 1 year warranty and contemplating paying for the additional 2 years of Applecare. Personally I would pay for the Applecare - I never purchase any kind of extended warranties but given the all-in-one nature of the iMac which is hard for users to work with, and costly for "qualified engineers" to work on, coupled with the possibility of a recurring screen issue it's probably worth it.
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Old Nov 29, 2011, 06:00 PM   #23
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This is the reason...

This is a very bad design flaw in the panel: the panel's edges are not sealed, and dirt creeps between the polarizer (I think) and the lcd panel. Apple started recently to replace those screen (sometimes, when they can't blame it on the user) with a new panel with sealed edges, but all owners of an affected iMac without a warranty are left out in the cold.

see https://discussions.apple.com/thread/2300580

This doesn't seem right to me, since this is a VERY widespread issue, I started a petition to get Apple to recall the affected machines.

Please sign and spread the word.
http://chn.ge*/vM0BwA
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Old Jan 22, 2012, 12:32 PM   #24
Dennisjorgensen
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Hi, I have the same issue. Screen looks like crap now. Any news of Apple owning up to this problem yet?
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Old Jan 22, 2012, 12:37 PM   #25
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Originally Posted by Dennisjorgensen View Post
Hi, I have the same issue. Screen looks like crap now. Any news of Apple owning up to this problem yet?
That's terrible.
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