I had a similar thing form on my 2009 iMac. I brought it in before the 3 year applecare expired and Apple replaced the screen.
/Jim
My warranty has expired, any idea what this is?
My warranty has expired, any idea what this is?
My warranty has expired, any idea what this is?
I am not sure what mine was. Repair was over $600, but covered under AppleCare.
Sometimes I win, other times not. This time AC paid off.
Honestly, if it was out of warranty, I would have lived with it until my next upgrade.
/Jim
Image
It's noticeable on any light background, seems to be on the actual LCD not the plastic
2010 iMac
I have the exact same shadowing in the exact same part of my screen, following the right hand edge. Personally, it's so minor that I ignore it. I'm about to swap my 2010 for a 2013. Recall or not, my Mac won't fetch that much money on resale, so I don't care to repair.
This exact same problem happened to me this spring on a 2010 iMac.
The "Genius" told me that it was a known issue now on these screens and that they are being replaced for up to 4 years after purchase, even when "out of warranty". It's kind of a "silent recall". When it happen they change it.
So you should be fine even being out of warranty.