After repairing my iPhone 5S, I'm having this issue?

I replaced the screen on my iPhone 5S. All went well, until I turned the phone on. I turned it on to find a scaled down resolution in addition to lines down the middle of the screen, though the phone was usable. Although, the longer I kept the screen on, the brighter it got. Also, the fingerprint scanner no longer worked, and I could not switch between front or rear cameras, it decided to do that on its own. I looked up the problem, and went back in to fix it. I read it was a loose connection, so i disconnected and reconnected all connections, but now the phone is stuck on the apple logo, and then a blue screen, in this continuous loop. Has anyone an idea of my issue and how to fix it? Much appreciated in advance.