What the red, white and yellow plugs on a three colour cable do
A three colour cable is the red, white and yellow lead that shipped with almost every TV, VCR and DVD player for two decades. Yellow carries composite video, white carries the left audio channel and red carries the right. The confusion starts because component video uses three RCA plugs as well, coloured green, blue and red, and the two sets look identical at a glance. Plugging a component set into a composite socket gives you a rolling black and white picture and no sound, which is why the colour code is worth learning properly.
Quick Answer
Yellow is composite video, white is left audio and red is right audio, so a three colour cable sends one video signal and two audio channels. Component video also uses three plugs but they are green, blue and red, and all three carry picture only. Match the colours to the labels on the device, not to the cable.
| Set | Colors | Carries | Where used |
|---|---|---|---|
| Composite A/V | Yellow + white + red | Video + L/R audio | VCR, older TV |
| Component video | Green + blue + red | Three video channels | HDTV before HDMI |
| Stereo audio only | White + red | Left + right audio | Amp, speaker line |
| Component plus audio | 5 plugs | 3 video + 2 audio | AV receiver |
What each of the three colours carries
Yellow is the video line. It carries a composite signal, where brightness and colour travel together on one conductor, and the plug is a plain 75 ohm RCA. White is the left channel and red is the right, both at line level, roughly half a volt to two volts. The colour code is a convention rather than a rule, so a cable with different sleeves still works if the ends match.
Because all three plugs are mechanically identical, a miswired set will physically fit any socket. That is what makes the standard so forgiving and so easy to get wrong. If the picture appears but the sound does not, swap the yellow lead into the video input first.
Why the plugs are all RCA
RCA was cheap, reliable and easy to mould onto a cable, so it became the default for consumer video and audio. A single shell design means one connector family covers video, line audio and digital coaxial, with only the colour and the printing on the device to tell them apart.
Composite versus component: the same shell, different job
Composite combines chrominance and luminance, so the television has to separate them again, and that separation is never perfect. Fine detail and saturated edges produce dot crawl and colour bleed. Component sends three separate channels, which keeps luminance clean and allows progressive and 1080i signals, so it looks noticeably sharper on a set that accepts it.
The trap is the colour overlap: red appears in both sets. On a composite lead, red is the right audio channel. On a component lead, red is the Cr channel, one of the three video signals. Sending audio into a component input produces no sound at all, because that socket expects video.
Reading the labels on the back of a TV
Look for the group names rather than the colours. Inputs marked Video, L and R form a composite group. Inputs marked Y, Pb and Pr, or Y, Cb and Cr, form a component group. Some sets share the green socket between composite video and the Y channel, which is why the label matters more than the plug.
Buying and using a three colour cable today
For short runs, any shielded 75 ohm cable works and the price difference between brands is mostly about plugs and strain relief. Look for moulded ends with a decent collar, because the joint between cable and plug is where these leads fail. A cable that is too stiff will pull out of a wall-mounted TV.
Length matters more than people expect. Composite video over 10 m of thin cable starts to soften, and audio picks up hum near mains wiring. If the run is long, use an active extender or move to HDMI through a converter rather than a longer passive lead.
Converting an old player to a modern TV
A composite to HDMI converter takes the yellow plug and the two audio plugs and outputs HDMI at 720p or 1080p. It cannot recover detail that the source never had, so expect a soft picture. Buy one with a power input, since bus-powered units are unreliable with older players.
Real-World Applications
- Reviving a VCR: yellow to the video input, white and red to the audio inputs, then tune the TV to the correct source.
- Connecting a DVD player to a pre-HDMI television through the composite group on the front panel.
- Using a component set on an early HDTV: green, blue and red into Y, Pb and Pr, with a separate two-plug lead for sound.
- Feeding a games console into a capture card that only offers a yellow composite socket.
Related Guides
For the full product range, browse our productlist. For a deeper dive, read video cable types guide, and for the next step, see rca as video.
FAQ
Can I use a three colour cable for component video?
Not safely. The cable itself is three 75 ohm leads, but the colours mislead you and the plugs may not be shielded the same way. Use a set marked green, blue and red so the three video channels stay in order.
Why is my picture black and white with a three colour cable?
The yellow plug is probably in a component socket, or the source is set to a video standard the TV does not support. Check that yellow goes to a Video input and that the player outputs composite rather than component.
Does a three colour cable carry HD video?
The composite version does not; it is limited to 480i or 576i. A component set can carry up to 1080i analogue HD, but neither passes audio on the video plugs.
What if my device has only white and red sockets?
That is an audio-only group, so you need a separate video path. Leave the yellow plug disconnected and use HDMI, component or a converter for the picture.
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