Dell P7524QT User Manual page 20

VGA connector
Pin number 15-pin side of the connected signal cable
1 Video-Red
2 Video-Green
3 Video-Blue
4 NC
5 Self-test
6 GND-R
7 GND-G
8 GND-B
9 Computer 5 V / 3.3 V
10 GND-sync
11 GND
12 DDC data
13 H-sync
14 V-sync
15 DDC clock
20 | About Your Display