Half screen disappears?

Few days back my phone fell down & after that half of my display screen disappears , but I am able to perform all the functions which are behind the blank part of screen. and now even my charging port is not working ,there is symbol of charging bit phone is not charging.

one of the local mobile repair person said its mother board problem & not display.

pls let me know whats the exact proplem ,is it motherboard or display.