why wont my screen light up on my desire 626 htc

[AC Question]

my phone shuts off all time while I'm on it, but when I turn it back on its ok. This time it turned on but my screen wont light up at all

 

[B. Diddy]

Welcome to Android Central! Try booting into Safe Mode: https://support.t-mobile.com/docs/DOC-28612. If it persists in Safe Mode, then the screen is probably failing.