Dell ST2421LB User manual

Dell™ST2420L/ST2421LmonitorUser'sGuide
Notes, Notices, and Cautions
Information in this document is subject to change without notice.
©2010Dell™Inc.Allrightsreserved.
Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell and the DELL logo are trademarks of Dell Inc. Microsoft and Windows are either trademarks or registered trademarks of Microsoft Corporation in
theUnitedStatesand/orothercountries;ENERGY STAR is a registered trademark of the U.S. Environmental Protection Agency. As an ENERGY STAR partner, Dell Inc. has
determined that this product meets the ENERGY STAR guidelines for energy efficiency.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any
proprietary interest in trademarks and trade names other than its own.
ST2420Lb/ST2421Lb
August2010Rev.A00


About Your Monitor
Setting Up the Monitor
Operating the Monitor
Solving Problems
Appendix
NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

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
AboutYourMonitor
Dell™ST2420L/ST2421LmonitorUser'sGuide
Package Contents
Product Features
Identifying Parts and Controls
Monitor Specifications
Plug and Play Capability
LCD Monitor Quality & Pixel Policy
Maintenance Guidelines
Package Contents
Your monitor ships with the components shown below. Ensure that you have received all the components and contact Dell if something is missing.
NOTE: Some items may be optional and may not ship with your Monitor. Some features or media may not be available in certain countries.
lMonitor with Stand
lPower Cable

lDVI Cable (optional)

lVGA Cable


Product Features
The ST2420L/ST2421L flat panel display has an active matrix, Thin-Film Transistor (TFT), and Liquid Crystal Display (LCD). The monitor features include:
■ST2420L/ST2421L: 60.97cm (24 inches) viewable area display.
■1920 x 1080 resolution, plus full-screen support for lower resolutions.
■Tilt adjustment capability.
■Plug and play capability if supported by your system.
■On-Screen Display (OSD) adjustments for ease of set-up and screen optimization.
■Software and documentation CD which includes an information file (INF), Image Color Matching File (ICM), and product documentation.
■Energy Saver feature for Energy Star compliance.
■Security lock slot.
Identifying Parts and Features
Front View

Back View
lSafety Information
lDrivers and Documentation media
lQuick Setup Guide
Front View
Front Panel Controls
Label
Description
1-2
Shortcut keys
*The default settings are Preset Modes and Brightness/Contrast.
1
Shortcut key: Preset Modes (Default)
2
Shortcut key: Brightness/Contrast (Default)
3
OSD menu select
4
EXIT
5
Power On/Off (light indicator below Dell logo)


Side View
Bottom View

BackView
Label
Description/Use
1
Barcode serial number label
To contact Dell for technical support.
2
Security lock slot
To help secure your monitor.
3
Dell Soundbar mounting brackets
To attach the optional Dell Soundbar.
4
Regulatory rating label
Lists the regulatory approvals.
5
Stand release button
To release stand assembly from monitor.
Left Side


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
Pin Assignments
VGA Connector

Bottom view

Label
Description
1
AC power cord connector
2
DVI connector
3
HDMI connector
4
VGA connector
5
Audio Line-in
6
Audio Line out
VESA Modes
Horizontal
Sync
Vertical Sync
Video
Power
Indicator
Power Consumption
Normal operation
Active
Active
Active
White
30 W (maximum)
20 W (typical)
Active-off mode
Inactive
Inactive
Blanked
Amber
Less than 1 W
Switch off
-
-
-
Off
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
Number
15-pin Side of the
Connected Signal Cable

DVIConnector
1
Video-Red
2
Video-Green
3
Video-Blue
4
GND
5
Self-test
6
GND-R
7
GND-G
8
GND-B
9
Computer 5V/3.3V
10
GND-sync
11
GND
12
DDC data
13
H-sync
14
V-sync
15
DDC clock
Pin
Number
24-pin Side of the Connected Signal
Cable
1
TMDS RX2-
2
TMDS RX2+
3
TMDS Ground
4
Floating
5
Floating
6
DDC Clock
7
DDC Data
8
Floating
9
TMDS RX1-
10
TMDS RX1+
11
TMDS Ground
12
Floating
13
Floating
14
+5V power
15
Selftest
16
Hot Plug Detect
17
TMDS RX0-
18
TMDS RX0+
19
TMDS Ground
20
Floating
21
Floating
22
TMDS Ground
23
TMDS Clock+
24
TMDS Clock-

HDMI Connector

Flat Panel Specifications
* Based on estimation
** ST2420L/ST2421L Color Gamut (Typical) is based on CIE1976 (81 %) and CIE1931 (68 %).
Pin Number
19-pin Side of the Connected Signal Cable
1
TMDS DATA 2+
2
TMDS DATA 2 SHIELD
3
TMDS DATA 2-
4
TMDS DATA 1+
5
TMDS DATA 1 SHIELD
6
TMDS DATA 1-
7
TMDS DATA 0+
8
TMDS DATA 0 SHIELD
9
TMDS DATA 0-
10
TMDS CLOCK
11
TMDS CLOCK SHIELD
12
TMDS CLOCK-
13
CEC
14
Reserved (N.C. on device)
15
DDC CLOCK (SCL)
16
DDC DATA (SDA)
17
DDC/CEC Ground
18
+5V POWER
19
HOT PLUG DETECT
Model
ST2420L/ST2421L
Screen type
Active matrix -TFT LCD
Panel type
TN
Screen dimensions
60.97cm (24 inches) (24-inch viewable image size)
Preset display area:
Horizontal
Vertical

531.36 mm (20.92 inches)
298.89 mm (11.77 inches)
Pixel pitch
0.277 mm
Viewing angle
160°(vertical)typical,170°(horizontal)typical
Luminance output
250 CD/m²(typical)
Contrast Ratio
1,000:1 (typical)
Dynamic Contrast Ratio
ST2420L: 8,000,000 to 1*
ST2421L: 7,000,000 to 1*
Faceplate coating
Antiglare with hard-coating 3H
Backlight
LED light bar system
Response Time
5 ms typical
Color Depth
16.7 mil colors
Color Gamut
81 %**

Resolution

Video Supported Modes

Preset Display Modes
ST2420L/ST2421L

Electrical

Physical Characteristics
Model
ST2420L/ST2421L
Horizontal scan range
30 kHz to 83 kHz (automatic)
Vertical scan range
56Hzto76Hz(automatic)
Maximum preset resolution
1920 x 1080 at 60 Hz
Model
ST2420L/ST2421L
Video display capabilities (HDMI playback)
480i/480p/576i/576p/720p/1080i/1080p
Display Mode
Horizontal Frequency
(kHz)
Vertical Frequency
(Hz)
Pixel Clock
(MHz)
Sync Polarity (Horizontal/Vertical)
VGA, 720 x 400
31.469
70.087
28.3
-/+
VGA, 640 x 480
31.469
59.940
25.2
-/-
VGA, 640 x 480
37.500
75.000
31.5
-/-
VESA, 800 x 600
37.879
60.317
40.0
+/+
VESA, 800 x 600
46.875
75.000
49.5
+/+
VESA, 1024 x 768
48.363
60.004
65.0
-/-
VESA, 1024 x 768
60.023
75.029
78.8
+/+
VESA. 1152 x 864
67.500
75.000
108.0
+/+
VESA, 1280 x 1024
64.000
60.000
108.0
+/+
VESA, 1280 x 1024
79.976
75.025
135.0
+/+
VESA, 1920 x 1080
67.500
60.000
148.5
+/+
Model
ST2420L/ST2421L
Video input signals
Analog RGB, 0.7 Volts +/-5%, positive polarity at 75 ohm input impedance
Digital DVI-D TMDS, 600mV for each differential line, positive polarity at 50 ohm input
impedance
HDMI, 600mV for each differential line, 100 ohm input impedance per differential pair
Synchronization input signals
Separate horizontal and vertical synchronizations, polarity-free TTL level, SOG
(Composite SYNC on green)
AC input voltage/frequency/current
100 to 240 VAC/50 or 60 Hz +3 Hz/2.0A (Max.)
Inrush iso surge current
120 V: 30 A (Max.)
240 V: 60 A (Max.)
Model
ST2420L/ST2421L
Connector type
lD-sub: Blue connector
lDVI-D: White connector
lHDMI
Signal cable type
lD-sub: Detachable, Analog, 15 pin, shipped attached to the monitor
lDVI-D
lHDMI


Environmental

Plug and Play Capability
You can install the monitor in any Plug and Play-compatible system. The monitor automatically provides the computer system with its Extended Display
Identification Data (EDID) using Display Data Channel (DDC) protocols so that the system can configure itself and optimize the monitor settings. If required,
the user can select different settings, but in most cases monitor installation is automatic.
LCD Monitor Quality & Pixel Policy
During the LCD Monitor manufacturing process, it is not uncommon for one or more pixels to become fixed in an unchanging state. The visible result is a fixed
pixel that appears as an extremely tiny dark or bright discolored spot. When the pixel remains permanently lit, it is known as a "bright dot." When the pixel
remains black, it is known as a "dark dot."
In almost every case, these fixed pixels are hard to see and do not detract from display quality or usability. A display with 1 to 5 fixed pixels is considered
normalandwithincompetitivestandards.Formoreinformation,seeDellSupportsiteat:support.dell.com.
Maintenance Guidelines
Dimensions (with stand)
Height
418.24 mm (16.47 inches)
Width
574.96 mm (22.64 inches)
Depth
203.68 mm (8.02 inches)
Dimensions (without stand)
Height
356.43 mm (14.03 inches)
Width
574.96 mm (22.64 inches)
Depth
59.72 mm (2.35 inches)
Stand dimensions
Height
149.85 mm ( 5.90 inches)
Width
203.68 mm (8.02 inches)
Depth
203.68 mm (8.02 inches)
Weight
Weight with packaging
5.75 kg (12.68 lb)
Weight with stand assembly and
cables
4.29kg(9.46lb)
Weight without stand assembly
(for wall mount or VESA mount
considerations -no cables)
3.65 kg (8.05 lb)
Weight of stand assembly
0.64 kg (1.41 lb)
Model
ST2420L/ST2421L
Temperature
Operating
0°to40°C(32°to104°F)
Non-operating
Storage: -20°to60°C(-4°to140°F)
Shipping: -20°to60°C(-4°to140°F)
Humidity
Operating
10% to 80% (non-condensing)
Non-operating
Storage: 5% to 90% (non-condensing)
Shipping: 5% to 90% (non-condensing)
Altitude
Operating
4,485 m (14,700 ft) max
Non-operating
12,191 m (40,000 ft) max
Thermal dissipation
102.36 BTU/hour (maximum)
68.24 BTU/hour (typical)

Caring for Your Monitor
For best practices, follow the instructions in the list below while unpacking, cleaning, or handling your monitor:
lTo clean your antistatic screen, lightly dampen a soft, clean cloth with water. If possible, use a special screen-cleaning tissue or solution suitable for the
antistatic coating. Do not use benzene, thinner, ammonia, abrasive cleaners, or compressed air.
lUse a lightly-dampened,warmclothtocleanthemonitor.Avoidusingdetergentofanykindassomedetergentsleaveamilkyfilmonthemonitor.
lIf you notice a white powder when you unpack your monitor, wipe it off with a cloth.
lHandle your monitor with care as dark-colored monitors may scratch and show white scuff marks more than lighter-coloredmonitors.
lTo help maintain the best image quality on your monitor, use a dynamically changing screen saver and turn off your monitor when not in use.
Back to Contents Page

CAUTION: Read and follow the Safety Instructions before cleaning the
monitor.
CAUTION: Before cleaning the monitor, unplug the monitor from the electrical
outlet.