Hm. It would probably be hard to repair yourself. If you could get to the actual screen and gently press around the edges you may get it to come back (assuming it's a connection issue), but it would be a temporary fix. My WAG is the screen is bad.
Pull BCM Fuse 13 for a few minutes and reinstall.
Use Scanner and check for any codes, also run IPC self-test with scanner or Forscan
A code will pinpoint issue