Screen won't work after replacement

I replaced my screen on my iPhone 6 plus a while back, and I tried to replace a broken camera on it today. I realized before trying to remove the camera that I had bought the wrong part, but when I reconnected the screen it lit up, but stayed black. I did in fact forget to disconnect the battery when I replaced the screen. I tested it using the old screen, which worked at first, but stopped working after testing it a second time. Is there anything that can be done to fix this?