After a succesfull screen replacement , screen top seems unresponsive

I replaced an iPhone 5c screen for a friend a days ago. Since I was installating it, I had some dead response from 3 different screens. I reconnected the original screen and it work flawless. I tried with a fouth screen and it starts working well until yesterday that my friend call me and told that the top side of the screen was unresponsive and it has a little crack on it (?!).

When I installed the screen in the final assembly, when you put the screen into de phone body, it was no easily assembled.

I did remove the red plastic protector from the back of the screen and cleaned the connector of the motherboard but nothing seems to work.

Any ideas?

Greetings from Mexico.