Dell Studio 1558 (Early 2010) - Manual (Page 325)

Ports
325
Composite Video
Composite video is an interface for sending or receiving an analog video
signal. It is a composite of several signals, LUMA, CHROMA, and SYNC
(together referred to as CVSB or Composite Video Blanking and Sync).
LUMA represents the brightness or luminance of the picture and includes
synchronizing or SYNC pulses. CHROMA carries the color information.
Composite video interface usually connects a VHS tape player, DVD player,
or game console to a television.
Composite Video
Pin Signal
1 GND
2 CVBS