How to Fix iPhone 7 & iPhone 7 Plus Black Screen of Death? 3uTools can tell you some tips to solve the problem of iPhone 7 black screen.
1.Hold Home button and keep 6-8 seconds, it can exit any program in stuck.
2.You can hold Power button and Home button to let it power off and then power on ,until iPhone shows white Apple logo.
3.If 2nd tip can't help you, you can try again while connecting your iPhone charger.
4.It’s possible that your iPhone 7 has no enough battery power that’s why your facing with iPhone 7 black screen. You should charge again till 5% ,iPhone can be power on.
5.Enter your iPhone in Recovery Mode:
Open 3uTools and connect your device with your PC.
Turn off your device by long-pressing Power Button.
Hold Power Button and Volume down Button at the same time and then Apple logo will appear.
Do not release until 3uTools displays your device is in recovery mode.
6. If all of above are useless, you can connect your iPhone with 3uTools to Enter DFU mode.