Intersting...
I have an iPhone 6. No problems and still working great.
I just got a new 7. Did the last update on my 6 and when it asked for the passcode and I was putting it in the screen went black. The phone was working just had a black screen. Went online and tried everything I found....black screen. Took it to the Apple Store. Burned out LED screen light. $130. I just got a new phone. Have had an iPhone since they first came out and never had a problem before.