Why does my screen go blank so quickly?

[travis826]

LG Rebel 4...I just purchased it and even though I've gone into tools/settings/display and changed it to 30 (or even "stay on forever") minutes it still goes blank after a few seconds. Also, how do I power my phone down? There are only 2 buttons and the only thing they do is turn my notifications volume up and down.

 

[B. Diddy]

Welcome to Android Central! Any power-saving modes turned on?

The Power button is on the back of the phone. Here's your manual: https://www.lg.com/us/support-mobile/lg-LML212VL