Chosen Solution

Hello fellow ifixit users I have recently broken my iPhone 5s screen and tried to replaced it and when I had tested My replacement screen it turned on but when I put screen cable bracket on it’s place and test it again it wouldn’t turn on anymore In the photo by the ribbon cables I see that there is three contact points which aren’t connected. Could it have something to do with that?

You should mask those three contact with electrical tape (or better yet, kapton tape). If they touch the LCD shield plate when you assemble the phone, it can cause display issues. Good quality replacement screens are supposed to have a small piece of tape covering them. Where did you buy your screen from?