Facetime camera and Earpiece not working.

Hi all looking for some advice. I recently replaced the screen on iPhone 6S Plus. Now the Facetime camera and ear piece don't work. The front facing camera and flash light work. I can also still record video and sounds. Any help much appreciated.

Checked the connection it clicks into place every time. I tried the ear peace through Siri which now works should if tried it in the first place. So it's just the camera nit functioning now. Thanks for the advice so far. This is my first repair.