What could be the problem with the iPhone screen?

Question

iPhone

iPhone 4s. The bottom line is that the screen was broken, the screen was replaced. Before replacing the screen was checked, everything was fine with the colors. After replacing the colors, it seems that there is not enough contrast + the bottom of the screen is darker than the top. True, this is noticeable only on iMessages, on your messages in blue.
What could be the problem? Is the screen itself bad? Somewhere bad contact?
Thanks in advance!

Answer 1

Most likely the screen itself.

Answer 2

The screen was most likely put on a cheap Chinese one, and that's how it works.

Answer 3

First, you can disassemble and fix the screen cable, and then scold the screen itself. there are no normal screens on iPhones for a long time, everyone is sitting on cheap Chinese, covered by a gorilla.