VGA to RCA Wiring Schematic
By Steve McDonnell
While you normally use a CAT5 cable for Ethernet communication, CAT5, CAT5e and CAT6 cables can also carry video communication. When you want to connect a device with a VGA output to a device that has component input, you can make a custom video cable from a CAT5 , CAT5e or CAT6 cable by attaching three component connectors to one end of the cable and connecting the proper wires to a 15-pin VGA connector on the other end of the cable. Component connections are done in the RCA format -- the phono plug with a single, stubby prong surrounded by a sturdy ground collar, commonly used in consumer A/V equipment.
Select three of the four color-coded pairs of wires in the CAT5 cable to use for the Y, Pr and Pb connections of the component cable.
Untwist the color-coded pairs you selected. Solder a component connector to each pair to create the component end of the cable.
Examine the VGA connector and assign a number from one to 15 to each of the pin sockets. For example, the first pin socket in the top row should be number one, the first pin socket in the second row should be number six and the last pin socket in the last row should be number 15.
Connect the wires in the CAT5 cable to the correct pin socket in the VGA connector. Connect the orange wire to pin socket one, the green wire to pin socket two and the blue wire to pin socket three. Connect the orange and white wire to pin socket six, the green and white wire to pin socket seven and the blue and white wire to pin socket eight. Connect the brown wire to pin socket 13 and the brown and white wire to pin socket 14.
Test each pin connection on the VGA connector with a multimeter to ensure it has a proper connection. Securely attach the VGA connector to the cable, connect both devices and ensure that the cable works properly.
- Use a shielded twisted-pair cable if possible to ensure the cable is compatible with high-demand monitors.
Steve McDonnell's experience running businesses and launching companies complements his technical expertise in information, technology and human resources. He earned a degree in computer science from Dartmouth College, served on the WorldatWork editorial board, blogged for the Spotfire Business Intelligence blog and has published books and book chapters for International Human Resource Information Management and Westlaw.