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iMac 21.5 Retina display grey marks

I

imtsha

macrumors newbie
Original poster
Jan 3, 2017
3
2
My iMac 21.5 retina 4K display (Late 2015) have developed strange grey marks on both bottom coroners. I am worried about these marks why these have developed on these expensive machines just within few months of purchasing. Is it a manufacturing defect? Or a sudden pixel problem? What can be done now ? My iMac is still under warranty, does it need LCD display replacement?
 
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I'd definitely take it in to be looked at if it's under warranty. It seems like what I saw once on an old friends Air. They said it was due to components behind the screen. I don't know much about Apple computers though.
 
Yes I am going to contact Apple support team as it is still under warranty, but I am also interested in to learn what is this problem actually? In case they replace Display panel, what are chances it won't happen to the new display. Also is it a common and known problem or it is just me having these grey, dusty marks ? If this is a real dust particles? Or screen marks? How dust can enter behind the glass ?
 
imtsha said:
Yes I am going to contact Apple support team as it is still under warranty, but I am also interested in to learn what is this problem actually? In case they replace Display panel, what are chances it won't happen to the new display. Also is it a common and known problem or it is just me having these grey, dusty marks ? If this is a real dust particles? Or screen marks? How dust can enter behind the glass ?
Click to expand...

I had this dreaded experience with my 2010 iMac and while it was on warranty and they replaced the screen for free, the problem appeared again and again until the warranty ended and they wouldn't replace the screen anymore. To this day I have an iMac that has awful grey marks on top of the screen.

But I was living overseas where authorized Apple dealers are not so generous and literally don't care if you bought a defect computer from Apple and got screwed for life.
If you live in the US then you might be luckier, I heard many times Apple even replaces the machine instead of just the defective screen. And definitely buy an Apple care.
 
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This indicates that Apple have either intentionally kept this defect so that ultimately the machine expires within a year or it is a manufacturer fault beyond Apple understanding.
 
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This theory might be completely not relevant to your own circumstances, only I had similar marks, although primarily affecting the lower left of the screen on a late 2013, 27" iMac.

I think one of the culprits was lit candles, located in reasonable proximity to the desk! Only during the summer months, we used to light scented candles to deter midges/mosquito's when the windows/doors are open. There is some good news, since we stopped lighting candles, the marks dispersed - we cannot see any traces ever since.

I would presume the higher the fans are working, the further the 'soot' works its way behind the screen and urban living (traffic, smoke etc) could potentially have the same effect?
 
Ninco said:
This theory might be completely not relevant to your own circumstances, only I had similar marks, although primarily affecting the lower left of the screen on a late 2013, 27" iMac.

I think one of the culprits was lit candles, located in reasonable proximity to the desk! Only during the summer months, we used to light scented candles to deter midges/mosquito's when the windows/doors are open. There is some good news, since we stopped lighting candles, the marks dispersed - we cannot see any traces ever since.

I would presume the higher the fans are working, the further the 'soot' works its way behind the screen and urban living (traffic, smoke etc) could potentially have the same effect?
Click to expand...

There was no candles or smoke in my case.
 
I had something like this on my old iMac and they replaced it under warranty.
 
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