Try pressing the source button on your tv remote. Then press the coloured av buttons in turn. If you get sound and/or a black and white picture when pressing one of the coloured buttons then try pressing it twice in quick succession which may acivate the sound and video. I assume that when you turn your theatre surround system on, you use the tv function rather than just using the main on/off button which only activates cd/dvd.
I have an RCA LCD L32HD31YX17 and a Phillips HTS 3544 Home Theater System. I have not been able to understand what to do from reading the other posts. I am trying to hear the surround sound watching tv. There are VID1,CMPT, HDMI and DVI and PC imputs. I want to watch tv using the surround sound but can only hear video at this time. Do you have any suggestions for me? Thanks in advance.