LX6810 - GT120 sound connection

[kalb52]

Folks, I need of a bit of help here. I purchased a refurbished LX6810
and it seems to be almost fully functional. The part that doesn't work
is the sound on an HDMI connection from the GT120 video card to a HD TV.
When I opened the box, I saw that the sound cable (labeled GP) from the
video card is hanging loose. I'm not able to figure out where to connect
this cable to obtain sound over the HDMI connection. My inquiries to
support went unanswered for lack of a motherboard diagram.
Would any of the owners of a similar machine be kind enough to take a
look and let me know how the cable is connected?

Thank you,
Kalb