BenQ G2420HD, Product Service Manual

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3.1.2.2 Signal interface
Item Condition Spec OK N.A Remark
Signal Cable
15-pin D-Sub
Color: Black
Length: 1500 +/- 30
mm

24-pin DVI-D
Color: Black
Length: 2000 +/- 50
mm

Pin assignment
15-pin D-sub
connector See Note-1

For 15-pin D-sub
24-pin DVI-D
connector See Note-2

For 24-pin DVI-D
19-pin HDMI
connector See Note-3

For 19-pin HDMI
Analog input
Signal type
Separate analog R/G/B 
For 15-pin D-sub
Level
700 mV (peak to peak) 
Impedance
75 Ohms +/- 1.5 Ohms 
Sync input
Signal type
Separate H/V-sync
Composite H/V-sync
(Positive/Negative)

For 15-pin D-sub
Level
Logic High: 2.4V ~
5.5V
Logic Low: 0V ~ 0.5V
(TTL level)

Refer to VESA
VSIS Standard
V1R1
Impedance
Minimum 2.2K Ω (pull
down)

10K Ω for
application
Sync Pulse Width
(SPW) 0.7 μ s < H-SPW
1H < V-SPW

Digital input
Level 600mV for each
differential line

Impedance 50 Ohm TDR Scan
needed for DVI cable
and interface board 
Note-1:
The pin assignment of 15-pin D-sub connector is as below,
PSignal Assignment Pin Signal Assignment
1 Red video 9 PC5V (+5 volt power)
2 Green video 10 Sync Ground
3 Blue video 11 Ground
4 Ground 12 SDA
5 Cable Detected 13 H-Sync (or H+V)
6 Red Ground 14 V-sync
7 Green Ground 15 SCL
8 Blue Ground