Help with RCA P52927 TV

I have this TV, 2000 RCA model # P52927.Several channels broadcast in SAP,even though TV is set to stereo.Most all channels have nothing but static.I have cable TV,and had the tech here today,and they tried to program the TV to play sound,what do we do to hear the TV in english,and have sound? Video games play fine,we hear sound,so we know the speakers are working.This problem started 5 days ago, prior to that,everything worked fine.. Any help is greatly appreciated. Thanks