Why screen changes colors of my redmi mobile?

Hello Vocigo,

There could be many reason that your phone screen changes the colors. As you told your phone has fallen down, might possible screen got damage from anywhere. A tiny damage in screen can cause flicker in screen. PCB and display cable can also be damage but probability is low. Most of the time mobile screen got damage.

Don't twist your phone otherwise it will permanent stop displaying and may damage other parts of the phone due to short circuit. Keep using like as it or replace your mobile display as soon as possible. You can read below guide that will help you to replace the screen: Xiaomi Redmi Note 7 Screen Replacement