Weird 45 degree light light gray lines

i have buyed my new black macbook 7 days ago and there is a big problem on the display, it's all full of weird 45 degree light light gray lines, i saw other macbook too and they haven't this problem or the problem is sooooooo light, but on my macbook for example the white don't exist and there is only white with a grey pattern X|
monday my apple shop send my laptop at apple assistence and i hope that it come back with fix and not in equal mode. i readed on blog that much people have this problem, and sometimes apple change the macbook.
someone have the same issues?
thanks a lot for the reply and really sorry for my bad english

This is something that's worse on some Macbook screens than others. On mine, it's noticeable in the top half of the screen, less noticeable as you move down, only shows up on a plain white background, and it's not really bothersome. But it's not perfect.
My guess is that if Apple paid more for the screens, they could get a higher standard of quality. As it is, they get some variation, and would probably replace ones that are really bad and have really persistent owners.
In a way, it's just like bad pixels. Apple doesn't expicitly guarantee you won't have any bad pixels, and they'll resist replacing the screen or computer if it's only one or two.

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AMD Quad-Core A8-6410 Processor + AMD Radeon(TM) R5 Graphics
15.6-inch diagonal HD BrightView WLED-backlit Display (1366x768)
8GB DDR3L System Memory (1 Dimm)
750GB 5400 rpm Hybrid Hard Drive
*as stated on the site
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When certain shades of grey or areas where some sort of shading occurs, I see the grey area with small slightly darker grey lines between the lighter, thicker grey lines. Certain shades of grey show it and it appears to be similar to Image 1. Instead of the black lines, it would look like a slightly darker shade of grey that makes up the majority of the area. Is there some sort of solution to this? Another similar thing that occurs, also with a darker grey is that, it looks like if pixels were almost streaming diagonally. Image 2 is a small screen shot of a site where I first noticed the problem (it occurs on all sites, and movies). Does my laptop not have the ability to properly show shading?
Image1:
Image2:

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Weird 45 degree light light gray lines

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