Look at all signs of reactions from it. Are you sure the new screen you got is broken as well? Also, try to plug it into itunes and see if it reacts. Good luck
The problem seems to be the screen. I think you must get a new screen for it. Do you have any other 4s screens that you could test with? Ones with shattered glass etc. Or you could find a cheap display online.
Hello, my name is Iver From Norway. I am 18 years old. Reparing iPhones is my hobby, and i have repaired hundres of phones so far. My first repair was a iPhone 3 year ago.