Unless both components have HDMI 1.4, the ARC (Audio Return Channel) will not send the TV audio back through the HDMI. (I don't think the LE32C74BD does.)

You'll likely need to connect your TV to your receiver, either with analog (RCA) cables, or optical audio cables to send the audio from the TV to the receiver, and you may need to select "External Speakers" in your TV's audio menu.