Chosen Solution
I have just replaced the screen on my iPhone ex after dropping it and now none of the cameras will work and nor will the face ID I have been watching heaps of videos on how to replace the screen and I have done exactly that but my cameras have gone black and face ID will not work
Might just need to disconnect the camera connectors and reconnect them. Sometimes it needs that little reboot but after that if they don’t work they would need a new front assembly