Okay so, I've read all this and i still need help. My first screen replacement was on my iPhone 5S. i broke the screen and it was bothering me. I had an iPhone 5S that my family had bought on ebay that everything worked perfectly but the phone was icloud blocked, which explains why it was so cheap. i decided to replace my screen with that screen. i turned off the phone, did the replacement and the new screen turned on but the touch was retarded and it had squares in the middle of the screen as if it were being pressed or something. i opened it back up and disconnected and reconnected the lcd, camera and the other plug thing. the screen simply stopped turning on after that even though the phone was on. i put back the broken screen and it worked perfectly.
i ordered a new screen on amazon and i got the wrong item (an iPhone 6 Plus screen) which was actually kind of perfect since my aunt's phone also needed a screen replacement. I did it again and the same thing happened. but on this one, i know that everything but the screen works. the touch is perfect, the phone is on, i'm sure the camera works.
I NEED HELP.