The above looks fine to me. I can't see anything to worry about. Maybe you need to stop fixating on it so much with that test. You could get the screen replaced and take the glass off and give it a clean after the repair. Doesn't look too hard from youtube vids i have seen.
My problem is i tried to do that, forget the test and enjoy the machine, I was willing to accept a bit of mild yellow on my two iMacs. I was ready for it. But both had red tint on the left hand side/center of the screen, making bright spots and warm patches visible. Something i couldn't live with as it was right in the middle or down the whole left hand side. A bit of yellow right down in a corner or at the bottom wouldn't bother me once i had gotten over it and forgotten about it.
See this photo for what i am talking about, i often browse the web with two pages side by side, and with my problem it was very noticeable that there was a bright patch of warming right in the center. I for one couldn't tolerate that on a £250 screen, let alone a machine costing £2,000+. Sorry not going to fly Apple.
After two machines, both with the red tint problem, i have now given up... sending back for a refund as we speak.
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My problem is i tried to do that, forget the test and enjoy the machine, I was willing to accept a bit of mild yellow on my two iMacs. I was ready for it. But both had red tint on the left hand side/center of the screen, making bright spots and warm patches visible. Something i couldn't live with as it was right in the middle or down the whole left hand side. A bit of yellow right down in a corner or at the bottom wouldn't bother me once i had gotten over it and forgotten about it.
See this photo for what i am talking about, i often browse the web with two pages side by side, and with my problem it was very noticeable that there was a bright patch of warming right in the center. I for one couldn't tolerate that on a £250 screen, let alone a machine costing £2,000+. Sorry not going to fly Apple.
After two machines, both with the red tint problem, i have now given up... sending back for a refund as we speak.

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