Connecting your hi-fi to your TV
To determine which connection to use, check which of the following your amplifier and TV has blessed you with.
Amplifiers with RCA connectors
Look for a analog RCA output on your TV, or a 3.5mm headphone out. If there isn't either of these, you might find an optical digital out. You will need a digital to analog converter which takes optical digital in, and spits out analog to go to your RCA inputs.
Amplifiers with digital inputs
If your amplifier has an optical input, its a no brainer, use the TV's optical out
Receivers with HDMI inputs
Check if your TV has a HDMI audio return channel and connect using HDMI read here for tips