Chosen Solution
iPhone 7 is more susceptible to screen variances, especially with multiple screen OEM vendors like LG, Sharp, etc. In the factory or official repair centers they have a special calibration box for this and good luck getting that in the aftermarket repair business So basically all we can do is keep exchanging screen until you find another one that has similar variances, or if your phone shipped with a LG, also get a LG screen, because they just don’t seem to fit other brands and vice versa. Or it’s just you folded the screen cables the wrong way and it’s causing interference.
It’s maybe not a proper install, tear down the iPhone 7 Plus LCD screen and assemble it again.
