Unfortunately, the screen is cracked and when that happened the display will no longer appear. It will more than likely need a new screen and LCD/Backlight.
The item "OnePlus 5 128GB Midnight Black (Unlocked) CRACKED SCREEN NO DISPLAY" is in sale since Thursday, January 18, 2018. This item is in the category "Cell Phones & Accessories\Cell Phones & Smartphones".
The seller is "dylamckeeve0" and is located in Minneapolis, Minnesota. This item can be shipped to United States.