Every time I enter my password into my LG G4 it makes the screen goes black.

[AC Question]

Whenever I enter my password at any point, the screen will go black, flash on for a second and then go back to sleep. I just bought this phone and have only used it for a day. Please help.

 

[B. Diddy]

Welcome to Android Central! Does this happen in Safe Mode as well? https://support.t-mobile.com/docs/DOC-28997