Dell ST2421L User Manual
Dell™ ST2420L/ST2421L monitor
User Guide
Important instructions to set the display resolution to 1920x1080 (Maximum)
Information in this document is subject to change without notice. © 2010-2013 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 registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
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
September 2013 |
Rev. A05 |
Dell™ ST2420L/ST2421L monitor User's Guide
About Your Monitor
Setting Up the Monitor
Operating the Monitor
Solving Problems
Appendix
Notes, Notices, and Cautions
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.
Information in this document is subject to change without notice. © 2010-2013 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.
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
September 2013 Rev. A05
Back to Contents Page
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.
Monitor with Stand
Power Cable
DVI Cable (optional)
VGA Cable
Safety Information
Drivers and Documentation media
Quick Setup Guide
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.
■Security lock slot.
Identifying Parts and Controls
Front View
Front View |
Front Panel Controls |
Label Description
1-2 Shortcut keys
*The default settings are Preset Modes and Brightness/Contrast.
1Shortcut key: Preset Modes (Default)
2Shortcut key: Brightness/Contrast (Default) 3 OSD menu select
4EXIT
5Power On/Off (light indicator below Dell logo)
Back View
Back View |
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Label |
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Description/Use |
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1 |
Barcode serial number label |
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To contact Dell for technical support. |
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2 |
Security lock slot |
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To help secure your monitor. |
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3 |
Dell Soundbar mounting brackets |
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To attach the optional Dell Soundbar. |
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4 |
Regulatory rating label |
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Lists the regulatory approvals. |
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5 |
Stand release button |
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To release stand assembly from monitor. |
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Side View
Left Side
Bottom View
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 |
Horizontal |
Vertical Sync |
Video |
Power |
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Power Consumption |
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Sync |
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Indicator |
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Normal operation |
Active |
Active |
Active |
White |
30 |
W (maximum) |
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20 |
W (typical) |
Active-off mode |
Inactive |
Inactive |
Blanked |
Amber |
Less than 1 W |
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Switch off |
- |
- |
- |
Off |
Less than 0.5 W |
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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 |
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Cable |
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 |
DVI Connector
Pin |
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24-pin Side of the Connected Signal |
Number |
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Cable |
1 |
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TMDS RX2- |
2 |
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TMDS RX2+ |
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3 |
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TMDS Ground |
4 |
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Floating |
5 |
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Floating |
6 |
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DDC Clock |
7 |
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DDC Data |
8 |
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Floating |
9 |
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TMDS RX1- |
10 |
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TMDS RX1+ |
11 |
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TMDS Ground |
12 |
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Floating |
13 |
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Floating |
14 |
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+5V power |
15 |
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Self test |
16 |
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Hot Plug Detect |
17 |
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TMDS RX0- |
18 |
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TMDS RX0+ |
19 |
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TMDS Ground |
20 |
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Floating |
21 |
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Floating |
22 |
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TMDS Ground |
23 |
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TMDS Clock+ |
24 |
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TMDS Clock- |
HDMI Connector
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 |
Flat Panel Specifications
Model |
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ST2420L/ST2421L |
Screen type |
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Active matrix - TFT LCD |
Panel type |
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TN |
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Screen dimensions |
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60.97cm (24 inches) (24-inch viewable image size) |
Preset display area: |
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Horizontal |
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531.36 mm (20.92 inches) |
Vertical |
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298.89 mm (11.77 inches) |
Pixel pitch |
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0.277 mm |
Viewing angle |
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160° (vertical) typical, 170° (horizontal) typical |
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Luminance output |
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250 CD/m² (typical) |
Contrast Ratio |
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1,000:1 (typical) |
Dynamic Contrast Ratio |
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ST2420L: 8,000,000 to 1* |
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ST2421L: 7,000,000 to 1* |
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Faceplate coating |
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Antiglare with hard-coating 3H |
Backlight |
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LED light bar system |
Response Time |
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5 ms typical |
Color Depth |
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16.7 mil colors |
Color Gamut |
88 %** |
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*Based on estimation
**ST2420L/ST2421L Color Gamut (Typical) is based on CIE1976 (88 %) and CIE1931 (72 %).
Resolution
Model |
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ST2420L/ST2421L |
Horizontal scan range |
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30 kHz to 83 kHz (automatic) |
Vertical scan range |
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56 Hz to 76 Hz (automatic) |
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Maximum preset resolution |
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1920 x 1080 at 60 Hz |
Video Supported Modes
Model |
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ST2420L/ST2421L |
Video display capabilities (HDMI playback) |
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480i/480p/576i/576p/720p/1080i/1080p |
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Preset Display Modes
ST2420L/ST2421L
Display Mode |
Horizontal Frequency |
Vertical Frequency (Hz) |
Pixel Clock |
Sync Polarity (Horizontal/Vertical) |
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(kHz) |
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(MHz) |
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VGA, 720 x 400 |
31.469 |
70.087 |
28.3 |
-/+ |
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