Chosen Solution

Hello! I bought an iPhone 6s with a broken screen and a dented case. I replaced the screen and case and now my front camera is not working. The camera app is just displaying a black screen. Everything else is working properly including the back camera and flash/flashlight. I reseated the front camera connector and did a hard reset with no avail. Any suggestions? Should I just order a new front camera?

You have done everything I would suggest, definitely time to order a new camera.