squares on the screen after battery replacement
I recently got an iphone 5s with a broken screen. I ordered a screen online and replaced it. It worked perfectly well except the proximity sensor that was not switching off when calling.
After a quick search online I managed to find the issue and I decided to order a new battery as well as I though mine was not lasting long.
I received the battery yesterday and opened the phone again, I replaced the proximity sensor and changed the battery of the iphone.
When I reassembled the phone and turned it on, I had some squares displaying on the top of the screen.
I though it was because the display connector was not properly connected, so I disconnected it and reconnected it. When I turned the phone on again, the squares are still showing up.
I took a photo of the screen displaying the square, you can see it here http://postimg.org/image/h7kq92sy3/
According to you, what's wrong ? What should I do ?
Thank you so much for helping me