Chosen Solution

After replacing my screen the phone was working perfectly fine. I opened up snapchat and attempted to take a picture. Then all of sudden the screen went completely black. I tried to turn it back on for a few hours then came to the conclusion that the screen was defective. A few days later my current screen came. I have installed it but this time the screen wont even turn on. The battery is new and I can feel the vibrations when connected to power. It is detected by iTunes so I know the actual phone still works. Also, the screen comes to life (flickers) occasionally when connected to power. Personally I believe I damaged my Logic board with a long screw but I wanted the opinion of someone who knows what they are talking about. If you have made it this far thank you and have a nice day :).

The first thing to check is the backlight circuit. Connect the phone to an iTunes enabled computer and then shine a bright light on the screen. If you can see a dim image on the screen, then you may have blown the backlight circuit on the logic board. When you replaced the screens, did you disconnect the battery prior to disconnecting the screen? As for long-screw damage, that is always possible. Just take a look inside the screw holes. If everything looks black, minus some blue thread locker or sometimes some metal scrapings from the screw, then you should be good.