iPhone 6 camera displays only a black screen
IiPhone 6+ camera displays black screen only.
iPhone 6 Plus, iOS 9.3.2
Hi
Take a look at the apple website here, https://www.apple.com/support/iphone6plus-isightcamera/
Check to see if your SN is part of the camera replacement program. If it isn't, then you can try calling into AppleCare for assistance with your camera. Call from a separate phone so proper troubleshooting can be performed on your iPhone.
Good Luck