Why does my phone screen spontaneously shuts down?

A

AC Question

I will be on my phone as usual and out of the blue my device screen will shut down. After pressing the power button the three buttons at the bottom will light up. Oddly I can still get into my phone, for example; I've have my password for so long that I can get into my phone without looking, with the dark screen I put my password in and it worked. ( I knew it did because it made the usual unlock click sound) So I have come to understand that my phone is still performing the functions however the screen will stay black, but I need to know why it's becoming black out of nowhere. I've tried taking the battery and SIM card out and restarting the phone however nothing happened. Please help!!
 

B. Diddy

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Welcome to Android Central! Does this happen regularly, or are you saying that the screen just went blank and hasn't come on again? If the latter, then the screen has most likely failed, and needs to be replaced.