Engineers just want to confirm you're at home so they can egg your house...
Seriously...
If you're having color temp problems on the screen, you should use a calibrator so you can view images professionally. If you don't need professional color calibration, you don't need color calibration. Color is the result of ambient light, backlighting, any distortions between your eye and the screen, and the accuracy of the display. If you have a yellow tint on the screen, it could mean that the screen coating is still curing and will require a few days to disappear. However in about 90% of the cases of a "yellow tint" it's from people reading the forums and assuming they have yellow tint like a hypochondriac. There are color calibration methods besides the app such as
http://www.lagom.nl/lcd-test/. If you find that you cannot perform these tests, you're a hypochodriac that thinks their screen has a problem and you should seek counseling. You're just looking for an excuse to find fault with a product that's supposed to make you happy. If that is the case, return the product and don't buy it again. It's pretty simple.