Chosen Solution
I dropped my iPhone and now has black screen. display not showing, phone still working, calls coming, and I feel touch system also not working. What should I do?
Reset, Hold both Home and Power buttons until the White Apple shows, usually about 15 seconds time. If that does not work, possibly the Screen Flex Connectors #1, #2 came loose from the Logic Board. If you can turn OFF iPhone, hold both buttons again for about 3-4 seconds, then release them, see if vibrate works if not, hopefully it is OFF. Carefully open iPhone and check to be certain both connectors are properly seated.
Also check your iphone’s screen under bright light. If your backlight IC damaged you still can see everything but in a lightless way..