How do I open a display in my Nokia Lumia 720 phone?

[Windows Central Question]

how to open display in nokia lumia 720 phone

After slipped from top of the TV, my phone is not opening its display. It don't has any breakage. I can here only sound from my phone, not the display.

 

[xandros9]

Something between the display and the brains has broken from that gravitational accident. It may be as simple as a loose connector or as complicated as a dead screen. Either way, repair is necessary.