iPhone 6 turned off and won't turn on, what could it be?

Question

iPhone

Hello, the iPhone 6 turned off by itself and now does not turn on, it finds it through iTunes, what could it be? Tell me please!

Answer 1

Have you tried charging?

Answer 2

Simultaneously hold down and hold the power and home buttons for about 15-20 seconds. If the download apple does not appear, then bring it to the service center

Answer 3

Does iTunes see it?
Synchronization starting?
Is there access to the body through iTunes?
If - yes, are you sure that the phone turned off? Perhaps the screen just died, and the body itself is working.