Chosen Solution
After a short fall, the rear 1x camera ceased working - just gives a black screen. The 2x works but only sometimes. Had the camera replaced with a new one (EXPENSIVE!) and still have the exact same problem. Any suggestions as to a fix?
You can try a system reset, just in case the fall caused a glitch, unlikely but it’s a fast and easy try, or possibly a board issue, but that’s not a DIY repair.