There are a number of factors that can contribute to the failure of the front camera/ proximity sensor/ambient light sensor.
What I would do is first check if the connector is properly seated on the socket itself. Usually it snaps into place. Next, I would check the pins on the connector and the logic board itself. Usually, the tiny gold pins on the sockets can be damaged from forceful installation of the connectors, which is not good. Always always always remember that if a connector does not want to snap on to a socket, do not force it or else damaged will be ensued. It has happened to me before.
Next i would check the installation of the camera/sensors on the screen. Was the camera lens holder and ambient/proximity sensor gasket transferred and properly seated onto the new screen? Are the screws present and properly torqued down on the earpiece bracket? Over tightening can cause damage and other problems. Is the earpiece and its bracket properly installed?
Lastly, I would check the flex cables themselves. Are they pinched or severely folded? This can potentially cause problems. The flex cables should only be formed in round or U shapes. The flex cable that connects the ground copper sticker on the back of the screen shield is an exception since it already comes looking messed up.
I'm not too sure if the copper sticker that sticks to the back of the screen shield would make a difference. I have gotten the camera and everything else working without it. However, I do suggest that you do reinstall it since it seems like it acts as a ground to complete the circuit.
+
Forgot to add one more thing. Restoring your phone would more than likely not do anything. It's usually not software related but if you do feel very confident that a restore would perhaps fix it and you backed up all your data, then by all means go for it.
Hi
There are a number of factors that can contribute to the failure of the front camera/ proximity sensor/ambient light sensor.
What I would do is first check if the connector is properly seated on the socket itself. Usually it snaps into place. Next, I would check the pins on the connector and the logic board itself. Usually, the tiny gold pins on the sockets can be damaged from forceful installation of the connectors, which is not good. Always always always remember that if a connector does not want to snap on to a socket, do not force it or else damaged will be ensued. It has happened to me before.
Next i would check the installation of the camera/sensors on the screen. Was the camera lens holder and ambient/proximity sensor gasket transferred and properly seated onto the new screen? Are the screws present and properly torqued down on the earpiece bracket? Over tightening can cause damage and other problems. Is the earpiece and its bracket properly installed?
Lastly, I would check the flex cables themselves. Are they pinched or severely folded? This can potentially cause problems. The flex cables should only be formed in round or U shapes. The flex cable that connects the ground copper sticker on the back of the screen shield is an exception since it already comes looking messed up.
I'm not too sure if the copper sticker that sticks to the back of the screen shield would make a difference. I have gotten the camera and everything else working without it. However, I do suggest that you do reinstall it since it seems like it acts as a ground to complete the circuit.
Best of luck.