Original post by: Ben ,
There are a number of reasons why some iPhone 6 screens usually replacement ones have either yellow, blue, or dark spots on the screen or edges of screen: - White dots on screen pressure marks usually caused by debris, screw behind backplate or under screen. - Huge pressure mark, screen been forced in with dented inward metal housing for phone. Could also be due to battery bulged. - Darkened sides can be either one side or both. LCD cable not plugged in properly in logic board FPC connector side. Connector could also have debris in it or be damaged. - Darkened sides also can be caused by a bad aftermarket screen or blown backlight circuit needing diagnosing.