Damage galaxy s6 during repair

I tried to replace the charger port on my galaxy s6 verizon. I end-up damage the screen . I bought a new screen an put it on. When I turn on the device there is a little light that flash a long side to the left of the screen for one second, and the screen stay black . But the is power on ,because when I plug it to my computer an open the samsung software it always ask me to unlock the phone. That means the phone is working. How do I fix that problem?