Strange blob on iMac 27 inch screen!

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Strange blob on iMac 27 inch screen!

Hi there!

I bought my machine in November 2011 and about a month ago I noticed a strange blob appearing on the screen. Since then it has gotten MUCH worse and very roughly travels from the lower left corner to the upper right.

It is not on the glass, it is on the actual screen!

I live in a smoke free environment and it does not seem to be dust. There is no way water could have gotten in there.

It is a Mid 2011 27 inch iMac.

I am curious if anyone else has had the same problem and if applecare covers it and if so how difficult it is to get them to replace the screen.. Thanks!

iMac (27-inch Mid 2011)

Posted on Jul 29, 2012 9:20 PM

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Answer 1

RRFS

Level 5

4,522 points

Jul 29, 2012 9:24 PM in response to Sibant

You have a 1 year warranty, I suggest you exercise your rights, now.

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Answer 2

kwaphoto

Level 1

10 points

Jul 29, 2012 9:33 PM in response to RRFS

Yes, get it to a store at the genius bar for an evaluation. My screen had a very small blob 5 days before AppleCare 3 year expired, they replaced the LCD :-)

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Answer 3

Aug 25, 2012 12:15 AM in response to Sibant

That looks familiar.

As my iMac (i5 2.7GHz mid-2011) is outside the guarantee period I decided to look into this problem as my screen has also developed darkened smears.

After taking the whole thing apart, it's now clear (in my case) it isn't simply a dust problem, the outer screen, backlight and LCD layers were found to be surprisingly dustfree.

However, there seem to be problems with the actual liquid crystal layer, this would explain why the smears fade or accentuate depending on the temperature of the working environment and the heat output of the processor block. The location of these smears is just above the processor block.

A replacement panel is the only answer.

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