Dell S2421HSX User manual

Monitor Model: S2421HS/S2721HS/S2421HSX/S2721HSX
Regulatory Model: S2421Ht/S2721Ht/S2721Ho
Dell S2421HS/S2721HS/S2421HSX/
S2721HSX Monitor
User’s Guide

NOTE: A NOTE indicates important information that helps you make better
use of your monitor.
CAUTION: A CAUTION indicates potential damage to hardware or loss of
data if instructions are not followed.
WARNING: A WARNING indicates a potential for property damage,
personal injury, or death.
NOTE: Dell Monitor with ComfortView or ComfortView Plus feature are
tested and complied to TUV Low Blue Light emission standard.
ComfortView featured product reduces panel blue light with software
solution and ComfortView Plus is with hardware solution.
This monitor may adopt either software or hardware solution depending on
the type of panel used during manufacturing.
For differentiation purpose, TUV logo can be found on the carton box and
safety label for ComfortView Plus monitor. There is no printing of logo for
ComfortView monitor.
1111244653 1111244655
Copyright © 2022-2023 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other
trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their
respective owners.
2023 – 08
Rev. A03

| 3
Contents
Safety instructions.......................... 5
About your monitor ......................... 6
Package contents . . . . . . . . . . . . . . . . . . . . . . 6
Product features . . . . . . . . . . . . . . . . . . . . . . .8
Identifying parts and controls . . . . . . . . . . . . . . . .9
Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Monitor specifications . . . . . . . . . . . . . . . . . . . 12
Resolution specifications . . . . . . . . . . . . . . . . . . . . . . 13
Preset display modes . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . 14
Physical characteristics. . . . . . . . . . . . . . . . . . . . . . . 15
Environmental characteristics . . . . . . . . . . . . . . . . . . . 16
Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Plug-and-play . . . . . . . . . . . . . . . . . . . . . . . 19
LCD monitor quality and pixel policy . . . . . . . . . . . 19
Ergonomics. . . . . . . . . . . . . . . . . . . . . . . . . 20
Handling and moving your display . . . . . . . . . . . . . 22
Maintenance guidelines . . . . . . . . . . . . . . . . . . 23
Cleaning your monitor. . . . . . . . . . . . . . . . . . . . . . . . 23
Setting up the monitor.......................24
Connecting the stand . . . . . . . . . . . . . . . . . . . 24
Using the tilt, swivel, and vertical extension . . . . . . . 26
Contents | 3

4| Contents
Tilt, Swivel, and Vertical Extension . . . . . . . . . . . . . . . . . 26
Rotating the display . . . . . . . . . . . . . . . . . . . . 27
Configuring the display settings on your computer after
rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Connecting your monitor . . . . . . . . . . . . . . . . . 28
Organizing your cables. . . . . . . . . . . . . . . . . . . 29
Securing your monitor using Kensington lock (optional) 29
Removing the monitor stand . . . . . . . . . . . . . . . 30
Wall mounting (optional) . . . . . . . . . . . . . . . . . 31
Operating the monitor ...................... 32
Power on the monitor . . . . . . . . . . . . . . . . . . . 32
Using the front panel controls. . . . . . . . . . . . . . . 32
Using the OSD lock function . . . . . . . . . . . . . . . 34
Front-panel button . . . . . . . . . . . . . . . . . . . . . 36
Using the On-Screen Display (OSD) menu . . . . . . . . 37
Accessing the menu system . . . . . . . . . . . . . . . . . . . . 37
OSD warning messages . . . . . . . . . . . . . . . . . . . . . . . 48
Setting the maximum resolution . . . . . . . . . . . . . . . . . . 51
Troubleshooting ........................... 52
Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . 53
Common problems . . . . . . . . . . . . . . . . . . . . . 54
Product specific problems . . . . . . . . . . . . . . . . . 56
Appendix..................................57
FCC notices (U.S. only) and other regulatory information 57
Contacting Dell. . . . . . . . . . . . . . . . . . . . . . . 57
EU product database for energy label and product information
sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Safety instructions | 5
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.
• Place the monitor on a solid surface and handle it carefully. The screen is fragile
and can be damaged if dropped or hit sharply.
• Always be sure that your monitor is electrically rated to operate with the AC
power available in your location.
• Keep the monitor in room temperature. Excessive cold or hot conditions can have
an adverse effect on the liquid crystal of the display.
• Do not subject the monitor to severe vibration or high impact conditions. For
example, do not place the monitor inside a car trunk.
• Unplug the monitor when it is going to be left unused for an extended period of
time.
• To avoid electric shock, do not attempt to remove any cover or touch the inside
of the monitor.
For information on safety instructions, see the Safety, Environmental, and Regulatory
Information (SERI).

6| About your monitor
About your monitor
Package contents
Your monitor ships with the components shown below. Ensure that you have received
all the components and see Contacting Dell if anything is missing.
NOTE: Some components may be optional and may not ship with your
monitor. Somefeatures may not be available in certain countries.
Display
S2421HS/S2721HS S2421HSX/S2721HSX Stand riser
S2421HS/S2721HS S2421HSX/S2721HSX Stand base
Power cable (varies by country)
HDMI cable

About your monitor | 7
• Quick Start Guide
• Safety, Environmental, and
Regulatory Information

8| About your monitor
Product features
The Dell S2421HS/S2721HS/S2421HSX/S2721HSX monitor has an active matrix,
Thin Film Transistor (TFT), Liquid Crystal Display (LCD), and LED backlight. The
monitor features include:
• S2421HS/S2421HSX: 60.45 cm (23.80 in.) active area display (measured
diagonally). 1920 x 1080 (16:9) resolution, plus full-screen support for lower
resolutions.
• S2721HS/S2721HSX: 68.6 cm (27 in.) active area display (measured diagonally).
1920 x 1080 (16:9) resolution, plus full-screen support for lower resolutions.
• Tilt, swivel, pivot and vertical extension adjustment capabilities.
• Removable pedestal and Video Electronics Standards Association (VESA™) 100
mm mounting holes for flexible mounting solutions.
• Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling easier
set up with an elegant viewing experience.
• Extensive digital connectivity with HDMI and DP helps future-proof your monitor.
• Plug and play capability if supported by your computer.
• On-Screen Display (OSD) adjustments for ease of set-up and screen
optimization.
• Supports AMD FreeSync™ technology. AMD Freesync™ certified range from 48
Hz - 75 Hz.
• Power and OSD buttons lock.
• Security lock slot.
• ≤ 0.3 W in Standby Mode.
• The Monitor adopts Flicker-Free technology, which clears the eye visible flicker,
brings comfort viewing experience and preventing users suffer from eye strain
and fatigue.
WARNING: The possible long-term effects of blue light emission from the
monitor may cause damage to the eyes, including eye fatigue or digital eye
strain. ComfortView and ComfortView Plus feature are designed to reduce
the amount of blue light emitted from the monitor to optimize eye comfort.
The ComfortView mode is optional in the OSD. Only when this mode is not
exist in the OSD, the factory default setting is qualified for the Low Blue
Light approval.
NOTE: ComfortView is a feature to reduce blue light emission with preset
color co-ordinates. This can be enabled with the OSD menu. ComfortView
Plus is a feature to reduce blue light emission with panel Backlight design.
No further setting by the user is required.

About your monitor | 9
Identifying parts and controls
Front view
1 2
S2421HS/S2721HS
1 2
S2421HSX/S2721HSX
Label Description Use
1Function buttons For more information, see Operating the Monitor.
2Power on/off button
(with LED indicator)
To turn the monitor on or off.

10 | About your monitor
Back view
1
2
3
4
5
S2421HS/S2721HS
1
2
3
4
5
S2421HSX/S2721HSX
Label Description Use
1VESA mounting holes (100 mm
x 100 mm-behind attached
VESA cover)
Wall mount monitor using VESA-compatible
wall mount kit (100 mm x 100 mm).
2Regulatory label Lists the regulatory approvals.
3Stand release button Releases stand from monitor.
4Barcode, serial number, and
Service Tag label
Refer to this label if you need to contact
Dell for technical support. The Service Tag
is a unique alphanumeric identifier that
enables Dell service technicians to identify
the hardware components in your display
and access warranty information.
5Cable management slot Use to organize cables by placing them
through the slot.

About your monitor | 11
Bottom view
1 2 3 4 5
S2421HS/S2721HS
1 2 3 4 5
S2421HSX/S2721HSX
Label Description Use
1Security lock slot Secures monitor with security cable lock (sold
separately).
2Power connector Connect the power cable (shipped with your
monitor).
3DisplayPort Connect your computer with the DisplayPort
cable (optional).
4HDMI port Connect your computer with the HDMI cable
(shipped with your monitor).
5Audio line-out port Connect speakers to playback audio through
HDMI or DisplayPort audio channels.
Only two-channel audio is supported.
NOTE: The audio line-out port does not support
headphones.

12 | About your monitor
Monitor specifications
Model S2421HS/S2421HSX S2721HS/S2721HSX
Screen type Active matrix - TFT LCD
Panel type In-plane switching technology
Aspect ratio 16:9
Viewable image dimensions:
Diagonal 60.45 cm (23.8 in.) 68.6 cm (27.0 in.)
Active Area:
Horizontal 527.0 4 mm (20.75 in.) 597.89 mm (23.54 in.)
Vertical 296.46 mm (11.67 in.) 336.31 mm (13.24 in.)
Area 156246.28 mm2(242.15 in.2) 201073.02 mm2(311.67 in.2)
Pixel pitch 0.2745 mm x 0.2745 mm 0.3114 mm x 0.3114 mm
Pixel per inch (PPI) 92.56 81.59
Viewing angle:
Horizontal 178° (typical)
Vertical 178° (typical)
Brightness 250 cd/m² (typical) 300 cd/m² (typical)
Contrast ratio 1,000 to 1 (typical)
Display screen coating Anti-glare treatment of the front polarizer (3H) hard
coating
Backlight LED edgelight system
Response Time
(Gray to Gray)
8 ms (normal)
5 ms (fast)
4 ms (extreme)
Color depth 16.7 million colors
Color gamut* sRGB 99.9%
Connectivity • 1 x HDMI 1.4
• 1 x DisplayPort 1.2
• 1 x Audio line-out port (3.5 mm jack)
Border width (edge of monitor to active area)
Top/Left/Right 5.4 mm 6.0 mm
Bottom 20.7 mm 21.3 mm
Adjustability

About your monitor | 13
Height adjustable stand 100 mm 110mm
Tilt -5° to 21°
Swivel -30° to 30°
Pivot -90° to 90°
Cable management Yes
Dell Display Manager
(DDM)Compatibility
Easy Arrange and other key features
Security Security-lock slot (cable lock sold separately)
*At panel native resolution only, under Custom Mode preset.
Resolution specifications
Model S2421HS/S2421HSX/S2721HS/S2721HSX
DisplayPort HDMI
Horizontal scan range 83 kHz to 83 kHz 30 kHz to 83 kHz
Vertical scan range 48 Hz to 75 Hz
Maximum preset resolution 1920 x 1080 at 75 Hz
Video display capabilities
(HDMI and DP alternate
mode)
480i, 480p, 576i, 576p, 720p, 1080i, 1080p
Preset display modes
Display mode Horizontal
frequency
(kHz)
Vertical
frequency
(Hz)
Pixel clock
(MHz)
Sync
polarity
(Horizontal/
Vertical)
VGA, 720 x 400 31.5 70.0 28.3 -/+
VGA, 640 x 480 31.5 60.0 25.2 -/-
VESA, 640 x 480 37.5 75.0 31.5 -/-
VESA, 800 x 600 37.9 60.0 40.0 +/+
VESA, 800 x 600 46.9 75.0 49.5 +/+
VESA, 1024 x 768 48.4 60.0 65.0 -/-
VESA, 1024 x 768 60.0 75.0 78.8 +/+
MAC, 1152 x 864 67.5 75.0 108.0 +/+
VESA, 1280 x 1024 64.0 60.0 108.0 +/+
VESA, 1280 x 1024 80.0 75.0 135.0 +/+

14 | About your monitor
VESA, 1600 x 900 60.0 60.0 108.0 +/+
CVT, 1920 x 1080 67.5 60.0 148.5 +/+
CVT, 1920 x 1080 83.89 75.0 174.5 +/-
Electrical specifications
Model S2421HS/S2421HSX/S2721HS/S2721HSX
Video input signals • Digital video signal for each dierential line
Per dierential line at 100 ohm impedance
• DP/HDMI signal input support
Input voltage/frequency/
current
100-240 VAC/50 or 60 Hz ± 3 Hz/1.5 A (maximum)
Inrush current 120 V: 30 A (maximum)
240 V: 60 A (maximum)
Power consumption
S2421HS/S2421HSX S2721HS/S2721HSX
0.2 W (Off Mode)1
0.2 W (Standby Mode)1
11.6 W (On Mode)1
23 W (Max)2
11.04 W (Pon)3
35.04 kWh (TEC)3
0.2 W (Off Mode)1
0.2 W (Standby Mode)1
15.7 W (On Mode)1
31 W (Max)2
12.59 W (Pon)3
40.14 kWh (TEC)3
1As defined in EU 2019/2021 and EU 2019/2013.
2Max brightness and contrast setting.
3Pon: Power consumption of On Mode as defined in Energy Star 8.0 version.
TEC: Total energy consumption in kWh as defined in Energy Star 8.0 version.
This document is informational only and reflects laboratory performance. Your product
may perform differently, depending on the software, components and peripherals
you ordered and shall have no obligation to update such information. Accordingly, the
customer should not rely upon this information in making decisions about electrical
tolerances or otherwise. No warranty as to accuracy or completeness is expressed or
implied.
NOTE: This monitor is ENERGY STAR certified.

About your monitor | 15
This product qualifies for ENERGY STAR in the factory default settings, which can be
restored by “Factory Reset” function in the OSD menu. Changing the factory default
settings or enabling other features may increase power consumption that could exceed
the ENERGY STAR specified limit.
Physical characteristics
Model S2421HS/S2421HSX S2721HS/S2721HSX
Connector type • 1 x HDMI1.4 port
• 1 x DisplayPort 1.2
• 1 x Audio line-out port
Signal cable type 1.8 m HDMI1.4 cable
Dimensions (with stand):
Height (extended) 446.8 mm (17.59 in.) 509.0 mm (20.04 in.)
Height (compressed) 346.8 mm (13.65 in.) 399.0 mm (15.71 in.)
Width 537.8 mm (21.17 in.) 609.9 mm (24.01 in.)
Depth 159.7 mm (6.29 in.) 174.7 mm (6.88 in.)
Dimensions (without stand):
Height 322.6 mm (12.70 in.) 363.6 mm (14.32 in.)
Width 537.8 mm (21.17 in.) 609.9 mm (24.01 in.)
Depth 53.8 mm (2.12 in.) 54.0 mm (2.13 in.)
Stand dimensions:
Height (extended) 361.5 mm (14.23 in.) 403.1 mm (15.87 in.)
Height (compressed) 325.4 mm (12.81 in.) 364.8 mm (14.36 in.)
Width 237.0 mm (9.33 in.) 257.0 mm (10.12 in.)
Depth 159.7 mm (6.29 in.) 174.7 mm (6.88 in.)
Weight:
Weight with packaging 7.0 kg (15.43 lb) 8.7kg (19.18 lb)
Weight with stand assembly
and cables
4.8 kg (10.58 lb) 6.0 kg (13.23 lb)
Weight without stand
assembly (For wall mount or
VESA mount considerations -
no cables)
3.2 kg (7.05 lb) 4.3 kg (9.48 lb)
Weight of stand assembly 1.3 kg (2.87 lb) 1.5 kg (3.31 lb)

16 | About your monitor
Environmental characteristics
Compliant standards
• ENERGY STAR certified Monitor
• TCO Certified
• RoHS Compliant
• BFR/PVC Reduce monitor (The circuit boards are made from BFR/PVC-free
laminates)
• Arsenic-Free glass and Mercury-Free for the panel only
Temperature:
Operating 0°C to 40°C (32°F to 104°F)
Non-operating -20 °C to 60 °C (-4 °F to 140 °F)
Humidity:
Operating 10% to 80% (non-condensing)
Non-operating 5% to 90% (non-condensing)
Altitude:
Operating (maximum) 5,000 m (16,404 ft)
Non-operating (maximum) 12,192 m (40,000 ft)
Thermal dissipation
S2421HS/S2421HSX 78.48 BTU/hour (maximum)
39.58 BTU/hour (On Mode)
S2721HS/S2721HSX 105.78 BTU/hour (maximum)
53.57 BTU/hour (On Mode)

About your monitor | 17
Pin assignments
DisplayPort
Pin
number
20-pin side of
theconnected signal cable
Pin
number
20-pin side of
theconnected signal cable
1ML3 (n) 11 GND
2GND 12 ML0 (p)
3ML3 (p) 13 CONFIG1
4ML2 (n) 14 CONFIG2
5GND 15 AUX CH (p)
6ML2 (p) 16 GND
7ML1 (n) 17 AUX CH (n)
8GND 18 Hot Plug Detect
9ML1 (p) 19 Return
10 ML0 (n) 20 DP_PWR

18 | About your monitor
HDMI port
Pin number 19-pin side of theconnected signal cable
1TMDS DATA 2+
2TMDS DATA 2 SHIELD
3TMDS DATA 2-
4TMDS DATA 1+
5TMDS DATA 1 SHIELD
6TMDS DATA 1-
7TMDS DATA 0+
8TMDS DATA 0 SHIELD
9TMDS 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 +5 V POWER
19 HOT PLUG DETECT

About your monitor | 19
Plug-and-play
You can install the monitor in any Plug-and-Play-compatible system. The monitor
automatically provides the computer with its extended display identification data
(EDID) using display data channel (DDC) protocols so that the computer can configure
itself and optimize the monitor settings. Most monitor installations are automatic;
you can select different settings if desired. For more information about changing the
monitor settings, see Operating the monitor.
LCD monitor quality and pixel policy
During the LCD monitor manufacturing process, it is not uncommon for one or more
pixels to become fixed in an unchanging state, which are hard to see and do not affect
the display quality or usability. For more information about LCD Monitor Pixel Policy,
see Dell support site at: https://www.dell.com/pixelguidelines.

20 | About your monitor
Ergonomics
CAUTION: Improper or prolonged usage of keyboard may result in injury.
CAUTION: Viewing the monitor screen for extended periods of time may
result in eye strain.
For comfort and efficiency, observe the following guidelines when setting up and using
your computer workstation:
• Position your computer so that the monitor and keyboard are directly in front of
you as you work. Special shelves are commercially available to help you correctly
position your keyboard.
• To reduce the risk of eye strain and neck/arm/back/shoulder pain from using the
monitor for long periods of time, we suggest you to:
1. Set the distance of the screen between 20 to 28 in. (50 - 70 cm) from your
eyes.
2. Blink frequently to moisten your eyes or wet your eyes with water after
prolonged usage of the monitor.
3. Take regular and frequent breaks for 20 minutes every two hours.
4. Look away from your monitor and gaze at a distant object at 20 feet away for
at least 20 seconds during the breaks.
5. Perform stretches to relieve tension in the neck, arm, back, and shoulders
during the breaks.
• Ensure that the monitor screen is at eye level or slightly lower when you are
sitting in front of the monitor.
• Adjust the tilt of the monitor, its contrast, and brightness settings.
• Adjust the ambient lighting around you (such as overhead lights, desk lamps, and
the curtains or blinds on nearby windows) to minimize reflections and glare on the
monitor screen.
• Use a chair that provides good lower-back support.
• Keep your forearms horizontal with your wrists in a neutral, comfortable position
while using the keyboard or mouse.
• Always leave space to rest your hands while using the keyboard or mouse.
• Let your upper arms rest naturally on both sides.
• Ensure that your feet are resting flat on the floor.
• When sitting, ensure that the weight of your legs is on your feet and not on the
front portion of your seat. Adjust your chair’s height or use a footrest if necessary
to maintain a proper posture.