Identify TV and Cable Box Connection Types

Updated 5/20/2019 2:57:12 PM by Comcast Expert


This article describes the various connection types to support high definition (HD) and standard definition (SD) TV service. When troubleshooting video or audio issues, verify that all physical connections are secure and that the TV is on the correct input for the cables being used between the TV and Comcast cable box.

The following article shows the various types of cabling connections found on televisions and Comcast cable TV boxes. Note that Comcast provides coaxial, HDMI, and/or component wiring during installation. Comcast does not supply S-Video, DVI, or Firewire cables.

Note: If the TV is on the wrong input or cables are unplugged the customer may have no video and/or audio.

Connection Types

HD Connections

HD TVs will connect with either an HDMI cable (one cable for both audio and video; looks similar to a USB computer cable) or Component cables (5 round colored cables, red/blue/green for video and red/white for audio).


SD Connections

SD TVs will connect with either Composite cables (3 round colored cables, yellow for video and red/white for audio) or a Coax cable (the same type of cable that connects from the cable box to the cable outlet, and has a metal screw ending).


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