Dell Studio 1558 (Early 2010) - Manual (Page 230)

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Connecting Your Computer to a TV and Adjusting Display Settings
3 Plug the single-connector end of the audio cable into the headphone
connector on your computer.
4 Plug the two RCA connectors on the other end of the audio cable into the
audio input connectors on your TV or other audio device.
Composite Video and Standard Audio
NOTE:
Depending on the computer, the composite video adapter may be a single
port or multi-port dongle. See the documentation shipped with your computer.
1 Connect the composite video adapter to the S-video TV-out connector on
your computer.
S-video TV-out
connector
standard audio
connector
composite
video adapter