Looks to me like a backlight issue; if I recall correctly it's called a stage light problem because it looks like the spotlights that used to be lined up along the front of a stage. Usually caused by half of the LEDs being out, which can be from several issues such as a bent or broken connector, damaged flex cable, or a blown fuse, among others.
So yeah, I'd try plugging the original screen back in, and if that one's backlight works correctly, then you've definitely got a bad replacement and should contact the vendor about a warranty replacement.