How to identify the ipad Yin-yang screen? The ipad Air screen identification method

What is the ipad Air Yin-yang screen

First, the so-called "yellow and white yin and yang screen" is in fact one side of the color of the Huang IPad3, the problem has appeared on the top of the above, for the new Ipadair again this problem, may be due to the new ultra-thin screen technology is not mature.
Second, the original ipad with two lamp, this time in order to reduce energy consumption and reduce weight, only a lamp, resulting in uneven screen brightness, estimated Apple is studying countermeasures, Apple has not yet issued a statement or explanation.

My question.

I have a friend who says that when you buy an ipad Air, you have to take a good look. He opened five machines yesterday to get a satisfactory, two in BestBuy Open, the first has a bad point, the second screen yellow on the left, don't let me change the only let me return, the third in square one a color point, fourth two color points. Fifth has a small gray point, in the Wi-Fi signal bar There is a Wi-Fi can not see out of the goods, I also intend to buy these days, want to ask how to identify yin and yang screen?

Identify the ipad Yin-yang screen method

It is said that the first ipad Air all the machine has a yin and yang screen problem, but the degree of yellowing is not the same, but you can use the serial number method to identify the ipad Air Yin and yang screen problem:
First, DMQL, slight yin and yang, slightly yellow color.
Second, the DLXL, the highest quality, the whole cold screen, a small part of the warm, a bit of leaky.
Third, Dmpl, good quality, slight yin and yang, slightly black on the left.
Four, dqtl, left yellow obvious, look at the page is very uncomfortable.
Five, DQVL, Basic yin and yang screen.

How to identify the ipad Yin-yang screen how to solve

There is no solution to this problem we only need to apply for a replacement, this problem is a direct replacement oh.