Dell XPS M1530 (M1530, Late 2007) - Manual (Page 115)

Pin Assignments for I/O Connectors 115
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Pin Assignments for I/O Connectors
USB Connector
Video Connector
NOTE: The color of the video connector may vary in color between blue and black.
Pin Signal
1 USB5V+
2 USBP–
3 USBP+
4 GND