Dell Studio 1749 (Early 2010) - Manual (Page 323)

Ports
323
S-Video TV-Out Port
SUPER Video (S-Video), also known as Y/C is an analog video signal that
carries the video data as two separate signals, luma (brightness) and chroma
(color). S-Video supports a standard definition video, but does not carry audio
on the same cable. S-Video provides sharp images when using a clean DVD
source. S-Video commonly connects to consumer TVs, DVD players, high-
end video cassette recorders, digital TV receivers, DVRs, and game consoles.
Composite video carries (lower-quality) picture information as a single signal.
S-Video
Pin Signal
1 GND
2 GND
3 LUMA
4 CHROMA
Composite Video
Pin Signal
5 GND
6 CVBS
7 NC