Apple TV/FM Radio System - Manual (Page 18)

11 Installing the Card and Software
Installing the TV/FM tuner card
1 There is a ribbon cable inside the computer, held in place
under the logic board tray, at the bottom of the chassis. Pull
the cable gently a short way out of the opening.
2 Remove the TV/FM tuner card from its static-proof bag. Hold
the card by its edges to avoid touching the connectors.
If the ribbon cable is taped down on the inside of the computer,
remove the tape and gently pull the ribbon cable a short way
out of the opening so that you can attach it to the card.
Ribbon cable