Why did the USB cable stop charging, but continues to transfer data?

Question

iPhone

In the presence of 5 and 6 iphone, they are not charging, but the data from the computer is running perfectly. The computer does not charge either, that is, it's not the adapter.

Answer 1

because Leningrad

Answer 2

The fact is that data and power are different wires in the cable. Therefore, the situation you describe may occur.
In your case, it may be: the cable itself, or the phone connector. All questions can be thrown away with the help of another cable, phone.