kanewolf :
You didn't provide a model number for the LG, but check to see if it has a digital audio output, either optical or RCA. Your Toshiba has a digital optical input.
americanaudiophile :
Since your TV doesn't seem to have any audio outputs you will need to connect an audio cable from the DTV box to the Toshiba for audio.
You may need a converter depending on what audio connections your DTV box has. If it has digital audio out and the Toshiba doesn't then you will need a DAC. If the DTV box only has HDMI out then you will need an HDMI switcher with audio extraction to provide an audio output.
My Dtv box has the following
1. Digital Audio out (orange)
2. Audio out (L-white)(R-red)
3.A/V out
4.Video out (V-yellow)
Toshiba has the following
1.audio in L-(1-white)(2-white)
2.Audio in R-(1-red)(2-red)
Two video in -both yellow
Video out -yellow / s video
Component video out
Red
Blue
Green
Digital in optical