My Logik L22LID18 screen has no sound on HDMI ?

Hi my Logik Tv has had this problem as long as I can remember, when I'm playing my games consoles on this TV there is a problem I get where it doesn't pick up characters voices but plays the background music and noises, however whenever I turn my head away from a character there voice returns. In a shorter version when I look directly at NPc's there voice isn't picked up, any help is appreciated.

The screen also dims completely when I go on the pc output, I've tried adjusting the setting on both the TV and the computer but have had no luck, the sharpness, colour and tiny option are also locked.

Dee
February 2017