Lenovo Z50-70 Screen shows white as yellowish

My laptop Z50-70 had one problem with it, since day one: The screen showed the white colour as yellowish. I thought it was something that is common to all such machines, so I compensated it by using Color Management in Windows to decrease yellow's intensity.
There's a yellowish tint to the
Recently I saw a friend's Lenovo Z50-70 without the same yellow tint. As it turns out his screen showed normal white normally. So I chatted with Customer Care and they asked me to send pictures of my screen's white. I did, but they said it's not noticeable.
What should I do?
I have reset my PC, reinstalled all the proper drivers at the right time, and nothing seems to improve.

How is the screen brightness in Windows Safe Mode?
Does the F11 & F12 Hot Keys adjust the brightness? If not, you might consider doing a clean install of the Lenovo Power Management driver. In other words uninstall it, reboot and do a clean install with a fresh copy.
In some respects the Power Management driver does have some influence on screen brightness. Since your problem is somewhat connected to a charging cycling which also falls under the Power Management driver, you might consider doing a clean install of that driver anyways.
Here is a link to the Power Management driver....
http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-z-series-laptops/lenovo-z50-70/downloads/DS100548

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