Hi
When this sort of thing happens it usually means that the display is internally damaged but I have had luck reseating the connector on the board
But because your display has cracks in it it will most likely need replacing
Here’s a guide in replacing the screen for your phone
[link|https://m.youtube.com/watch?v=h9uETgnfzD8|https://m.youtube.com/watch?v=h9uETgnfzD8|new_window=true]
Also here’s the part you will need too
https://www.ebay.co.uk/itm/255668681891?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=WNfII6j2ShK&sssrc=2349624&ssuid=0ACG7idPSQ6&var=&widget_ver=artemis&media=COPY
Hopefully this helps
Any questions please ask
Thanks:-)