To fix iPhone black screen of death, you can also restore your iPhone through iTunes. However, please make sure you have backed up all your important data from your iPhone via iTunes to restore iPhone with the iTunes backup. And during the process, iTunes will erase all data and settings on your iPhone to fix your iPhone. Now, you can start to fix your iPhone black screen issue.
> Firstly, get a USB cord to link your iPhone to computer and launch iTunes on computer.
> Secondly, click the iPhone icon on iTunes, then hit the Restore iPhone option on the right panel on iTunes window.
> Finally, confirm your action to restore your iPhone on the pop-up window. Then iTunes will start to erase all data and settings on your iPhone, download and install the latest iOS version on your iPhone. Finishing the process, your iPhone black screen issue will be fixed.