Most television sets interface with external devices such as DVD players, video game players and external stereo equipment with RCA connections. You can recognise an RCA connection by three coloured cables--red, white and yellow. Computer systems interface with display monitors with VGA connections. You can connect the RCA output from your television or other RCA device to the VGA input on a computer monitor using a special adaptor, as long as your television supports RCA video output.
Locate the video output on your television or other RCA device. This is usually located on the back of the television. Plug the yellow end of a standard RCA cable into the yellow "Video Output" port on the television.
Unscrew the connectors that secure the VGA cable to the back of your computer monitor with your hands. Unplug the VGA cable from the back of your computer monitor and set the cord aside.
Plug the free end of the yellow RCA cable into an RCA to VGA adaptor. Plug the male end of the RCA to VGA adaptor into the female input on the back of the monitor. Turn the pins clockwise to secure the VGA cable screws to the adaptor.
Turn on the television or other RCA device and tune it to the appropriate channel or setting. Turn on the monitor. The computer monitor display will now show the output from the RCA device.