The white screen, also known as white screen of death, can be caused by a couple of things after a fall. If you're lucky all that happened was that the LCD connector came disconnected and you just need to lift the screen up and securely connect it again. If you're not so lucky it means that your LCD is now not working.
ifixit has a step by step for replacing the LCD. Try following steps 1-4 except when you get to step 4 try pushing that connector back where it belongs instead of unattaching it. Front Panel Assembly Instructions
Good luck! Let me know what happens.
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