Dell Complete Specifications and Power Saving Features for ST2420LB, ST2421L, and ST2421LB Monitors

Bottom view

Label Description

1

2

3

4

5

6

AC power cord connector

DVI connector

HDMI connector

VGA connector

Audio Line-in

Audio Line out

Monitor Specifications

Power Management Modes

If you have VESA's DPMS™ compliance display card or software installed in your PC, the monitor can automatically reduce its power consumption when not in use. This is referred to as Power Save Mode. If input from a keyboard, mouse or other input devices is detected by the computer, the monitor will automatically "wake up". The following table shows the power consumption and signaling of this automatic power-saving feature:

ST2420L/ST2421L

VESA Modes

Normal operation

Active-off mode

Switch off

Horizontal	Vertical Sync	Video
Sync
Active	Active	Active
Inactive	Inactive	Blanked
-	-	-

Power

Indicator

White

Amber

Off

Power Consumption

30 W (maximum)

20 W (typical) Less than 1 W

Less than 0.5 W

NOTE: This monitor is ENERGY STAR®-compliant.

NOTE: Zero power consumption in OFF mode can only be achieved by disconnecting the main cable from the monitor.

Pin Assignments

VGA Connector

Pin Number

15-pin Side of the Connected Signal Cable