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.
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.
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.
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.
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 Bottom View Bottom view Label Description
AC power cord connector 1 DVI connector 2 HDMI connector 3 VGA connector 4 Audio Line-in 5 Audio Line out 6 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".
Pin Number 15-pin Side of the Connected Signal 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.
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 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 ST2420L/ST2421L Screen type Active matrix - TFT LCD Panel type TN Screen dimensions 60.
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) ST2420L: 8,000,000 to 1* Dynamic Contrast Ratio 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 88 %** * Based on estimation ** ST2420L/ST2421L Color Gamut (Typical) is based on CIE1976 (88 %) and CIE1931 (72 %).
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.
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 of stand assembly 0.64 kg (1.
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) 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.
Back to Contents Page Setting Up the Monitor Dell™ ST2420L/ST2421L monitor User's Guide Attaching the Base Connecting the Monitor Attaching the Soundbar (Optional) Removing the Monitor Stand Attaching the Base NOTE: The stand riser and stand base are detached when the monitor is shipped from the factory. 1. Assemble the stand riser to stand base. a. Place the stand riser on top of the stand base. Slide the stand riser horizontally until the tabs are fully inserted into the stand base grooves. b.
2. Attach the stand assembly to the monitor. a. Place the monitor on a soft cloth or cushion near the edge of desk. b. Align the stand assembly bracket to the monitor groove. c. Insert the bracket towards monitor until it locked in place.
Connecting the Monitor CAUTION: Before you begin any of the procedures in this section, follow the safety instructions. To connect your monitor to the computer perform the following steps/instructions: 1. Turn off your computer and disconnect the power cable. 2. Connect the HDMI cable, white (digital DVI-D), or blue (analog VGA) display connector cable to the corresponding video port on the back of your computer. Do not use all the cables on the same computer.
Connecting the HDMI Cable* NOTE: *Optional purchase item. To purchase DVI or HDMI cable, please visit Dell.com NOTE: The Graphics are used for the purpose of illustration only. Appearance of the the computer may vary. After you have completed connecting the VGA/DVI/HDMI cable, follow the procedure below to complete your monitor setup: 1. Plug the power cables for your computer and monitor into a nearby outlet. 2. Turn on the monitor and the computer.
1. Working from the rear of the monitor, attach the Soundbar by aligning the two slots with the two tabs along the bottom rear of the monitor. 2. Slide the Soundbar to the left until it snaps into place. 3. Connect the Soundbar with the DC power connector. 4. Insert the mini stereo plug from the rear of the Soundbar into the computer's audio output jack or the monitor's audio output jack. NOTICE: Do not use with any device other than the Dell Soundbar.
After placing the monitor panel on a soft cloth or cushion, complete the following steps to remove the base. 1. Use a long screwdriver to push the release latch located in a hole just above the stand. 2. Once the latch is released, remove the base away from the monitor.
Back to Contents Page Operating the Monitor Dell™ ST2420L/ST2421L monitor User's Guide Using the Front Panel Using the On-Screen Display (OSD) Menu Setting the Maximum Resolution Using the Dell Soundbar (Optional) Using the Tilt Using the Front Panel Use the control buttons on the side of the monitor to adjust the characteristics of the image being displayed. As you use these buttons to adjust the controls, an OSD shows the numeric values of the characteristics as they change.
NOTE: Auto Adjust is only available when you are using the analog (VGA) connector. 2. Press the and 3. Press the button once to activate the highlighted option. 4. Press the and 5. Press the 6. Press the Icon buttons to move between the setting options. As you move from one icon to another, the option name is highlighted. See the table for a complete list of all the options available for the monitor. buttons to select the desired parameter.
Input Color Format Mode Selection Allows you to set the color format. Allows you to set the display mode to Graphics or Video. If your computer is connected to your monitor, choose Graphics. If a DVD, STB, or VCR is connected to your monitor, choose Video. Preset Modes VGA input Standard Multimedia Game Warm Cool Custom (RGB) Mode suitable for desktop applications. Mode for multimedia applications, e.g., video playback. Mode suitable for gaming applications.
Back Display Settings Press the button to go back to or exit the main menu. Wide Mode Adjusts the image ratio as 4:3 or full screen. NOTE: Wide Mode adjustment is not required at maximum preset resolution 1920 x 1080. Horizontal Position Vertical Position Sharpness Pixel Clock Use the and buttons to adjust image left and right. Minimum is '0' (-). Maximum is '100' (+). Use the and buttons to adjust image up and down. Minimum is '0' (-). Maximum is '100' (+).
Language Menu Transparency Menu Timer Language option to set the OSD display to one of 6 languages (English, Espanol, Francais, Deutsch, Simplified Chinese, Japanese). Allows you to adjust the OSD background from opaque to transparent. OSD Hold Time: Sets the amount of time the OSD will remain active after the last time you pressed a button. Use the and buttons to adjust the slider in 5 second increments, from 5 to 60 seconds. Menu Lock Controls user access to adjustments.
OSD Warning Messages When the monitor does not support a particular resolution mode you will see the following message : or This means that the monitor cannot synchronize with the signal that it is receiving from the computer. See Monitor Specifications for the Horizontal and Vertical frequency ranges addressable by this monitor. The recommended mode is 1920x1080.
See Solving Problems for more information. Setting the Maximum Resolution To set the maximum resolution for the monitor. Windows XP: 1. 2. 3. 4. Right-click on the desktop and select Properties. Select the Settings tab. Set the screen resolution to 1920 x 1080. Click OK. Windows Vista® or Windows ® 7: 1. 2. 3. 4. Right-click on the desktop and select Personalization. Click Change Display Settings.
Back to Contents Page Solving Problems Dell™ ST2420L/ST2421L monitor User's Guide Self-Test Built-in Diagnostics Common Problems Product-Specific Problems Troubleshooting the Dell™ Soundbar (Optional) CAUTION: Before you begin any of the procedures in this section, follow the Safety Instructions. Self-Test Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly.
Your monitor has a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent problem with your monitor, or with your computer and video card. NOTE: You can run the built-in diagnostics only when the video cable is unplugged and the monitor is in self-test mode. To run the built-in diagnostics: 1. Ensure that the screen is clean (no dust particles on the surface of the screen). 2. Unplug the video cable(s) from the back of the computer or monitor.
Perform monitor self-test feature check. Check for bent or broken pins in the video cable connector. Run the built-in diagnostics. Poor Focus Picture is fuzzy, blurry, or ghosting Perform Auto Adjust via OSD. Adjust the Phase and Pixel Clock controls via OSD. Eliminate video extension cables. Reset the monitor to Factory Settings. Change the video resolution to the correct aspect ratio (16:9). Shaky/Jittery Video Wavy picture or fine movement Perform Auto Adjust via OSD.
Intermittent Problems Monitor turns on & off Ensure that the video cable connecting the monitor to the computer is connected properly and is secure. Reset the monitor to Factory Settings. Perform monitor self-test feature check to determine if the intermittent problem occurs in self-test mode. Missing Color Picture lacks color Perform monitor self-test feature check. Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
Turn the volume up. Clean and reseat the audio line-in plug. Test the Soundbar using another audio source (i.e., portable CD player). Distorted Sound Computer's sound card is used as the audio source. Clear any obstructions between the Soundbar and the user. Confirm that the audio line-in plug is completely inserted into the jack of the sound card. Set all Windows volume controls to their midpoints. Decrease the volume of the audio application. Turn the volume down.
Back to Contents Page Appendix Dell™ ST2420L/ST2421L monitor User's Guide Safety Instructions FCC Notice (U.S. Only) and Other Regulatory Information Contacting Dell CAUTION: Safety Instructions CAUTION: Use of controls, adjustments, or procedures other than those specified in this documentation may result in exposure to shock, electrical hazards, and/or mechanical hazards. For information on safety instructions, see the Safety Information that ships with your monitor. FCC Notice (U.S.
Back to Contents Page Setting Up Your Monitor Dell™ ST2420L/ST2421L monitor Important instructions to set the display resolution to 1920x1080 (Maximum) For optimal display performance while using the Microsoft Windows ® operating systems, set the display resolution to 1920 x 1080 pixels by performing the following steps: In Windows XP: 1. Right-click on the desktop and click Properties. 2. Select the Settings tab. 3.
Back to Contents Page Setting Up Your Monitor Dell™ ST2420L/ST2421L monitor If you have a Dell™ desktop or a Dell™ portable computer with internet access 1. Go to http://support.dell.com, enter your service tag, and download the latest driver for your graphics card. 2. After installing the drivers for your Graphics Adapter, attempt to set the resolution to 1920x1080 again.
Back to Contents Page Setting Up Your Monitor Dell™ ST2420L/ST2421L monitor If you have a non Dell™ desktop, portable computer, or graphics card In Windows XP: 1. Right-click on the desktop and click Properties. 2. Select the Settings tab. 3. Select Advanced. 4. Identify your graphics controller supplier from the description at the top of the window (e.g. NVIDIA, ATI, Intel etc.). 5. Please refer to the graphics card provider website for updated driver (for example, http://www.ATI.com OR http://www.
