Dell U2421E User Manual
Dell UltraSharp 24
USB-C Hub Monitor - U2421E
User’s Guide
Model: U2421E
Regulatory model: U2421Et
NOTE: A NOTE indicates important information that helps you make
better use of your computer.
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.
Copyright © 2020 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.
2020 – 10
Rev. A00
Contents
Safety instructions..............................5
About your monitor .............................6
Package contents . . . . . . . . . . . . . . . . . . . . . . . . . 6
Product features. . . . . . . . . . . . . . . . . . . . . . . . . .7
Identifying parts and controls. . . . . . . . . . . . . . . . . . .8
Front view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Monitor specifications. . . . . . . . . . . . . . . . . . . . . . .11
Resolution specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Preset display modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
DP MST Multi-Stream Transport (MST) Modes . . . . . . . . . . . . . . 13
USB-C MST Multi-Stream Transport (MST) Modes . . . . . . . . . . . . 13
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . 16
Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Plug-and-Play . . . . . . . . . . . . . . . . . . . . . . . . . . 24
LCD monitor quality and pixel policy . . . . . . . . . . . . . . 24
Ergonomics . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Handling and moving your display. . . . . . . . . . . . . . . . 27
Maintenance guidelines . . . . . . . . . . . . . . . . . . . . . 28
Cleaning your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Setting up the monitor..........................29
Connecting the stand . . . . . . . . . . . . . . . . . . . . . . 29
Using the tilt, swivel, and vertical extension . . . . . . . . . . 32
Contents | 3
Tilt, swivel and vertical extension . . . . . . . . . . . . . . . . . . . . . .32
Rotating the Display . . . . . . . . . . . . . . . . . . . . . . . 32
Configuring the display settings on your computer after rotation 33
Connecting your monitor . . . . . . . . . . . . . . . . . . . . 34
Organizing your cables . . . . . . . . . . . . . . . . . . . . . 38
Securing your monitor using Kensington lock (optional) . . . 38
Removing the monitor stand . . . . . . . . . . . . . . . . . . 39
Wall mounting (Optional) . . . . . . . . . . . . . . . . . . . . 40
Operating the monitor ..........................41
Power on the monitor . . . . . . . . . . . . . . . . . . . . . . 41
Using the joystick control . . . . . . . . . . . . . . . . . . . . 41
Using the rear-panel controls . . . . . . . . . . . . . . . . . . 42
Using the OSD lock function . . . . . . . . . . . . . . . . . . 43
Front-panel button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Using the On-Screen Display (OSD) Menu . . . . . . . . . . . 47
Accessing the menu system . . . . . . . . . . . . . . . . . . . . . . . . .47
OSD warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Setting the maximum resolution. . . . . . . . . . . . . . . . . . . . . . .61
Troubleshooting ...............................62
Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . . . . 63
Common Problems. . . . . . . . . . . . . . . . . . . . . . . . 64
Product specific problems . . . . . . . . . . . . . . . . . . . 65
Universal Serial Bus (USB) specific problems . . . . . . . . . 68
Appendix.....................................70
FCC notices (U.S. only) and other regulatory information . . . 70
Contacting Dell . . . . . . . . . . . . . . . . . . . . . . . . . 70
EU product database for energy label and product information
sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4 | Contents
Safety instructions
WARNING: 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).
Safety instructions | 5
About your monitor
Package contents
Your monitor ships with the components shown in the table below. If any component is
missing, contact Dell. For more information, see Contact Dell.
NOTE: Some components may be optional and may not ship with your
monitor. Somefeatures may not be available in certain countries.
Display
Stand riser
6 | About your monitor
Stand base
Power cable (varies by country)
DisplayPort cable (DisplayPort to
DisplayPort)
USB Type-C cable (C to A)
USB Type-C cable (C to C)
Dell UltraSharp U2421E
2020-09
U2421E Color Calibration Factory Report
Every Dell U2421E is shipped incorporating pre-tuned
Serial No.
CN00WG2J7444572B046L
standard mode(sRGB) with average Delta-E ≤2.
This helps prevent significant color inconsistency or
Tester
2008L0415
inaccuracy when content is displayed onscreen.
In addition, a tighter grey-scale tracking on each U2421E
helps enable ultra-smooth color gradation. The factory
measurements from this very unit are shown here.
Test
CA-210/CA-310
CA-2000S
Equipment
Be assured of Accurate, Precise and Consistent
Chroma 2326/2235/2233
Onscreen Color with eve
ry Dell UltraSharp U2421E.
Standard mode (sRGB) Avg. Delta E ≤ 2
Gray-Scale Tracking
Dell.com/U2421E
Gamma
Note:
Calibrations were done according to Dell approved test procedures using calib rated
equipment at the factory production line. This Report is provided only with and for this new Dell U2421E
UltraSharp monitor. Results may vary with other test equipment, setups and test p atterns. Pleas e retain this Re port
for your reference as Dell is unable to reproduce it or provide a duplicate.
• Quick Setup Guide
• Safety, Environmental, and Regulatory
Information
• Factory Calibration Report
Product features
The Dell UltraSharp U2421E monitor has an active matrix, Thin-Film Transistor
(TFT), Liquid Crystal Display (LCD), and LED backlight. The monitor features include:
• 61.13 cm (24.1 in.) active area display (Measured diagonally) 1920 x 1200 (16:10)
resolution, plus full-screen support for lower resolutions.
• Wide viewing angles with 99% sRGB color with an average Delta E<2.
• Tilt, swivel, pivot and vertical extension adjustment capabilities.
• Removable pedestal stand and Video Electronics Standards Association (VESA™)
100 mm mounting holes for flexible mounting solutions.
• Ultra-thin bezel minimizes the bezel gap during multi-monitor usage, enabling
easier set up with an elegant viewing experience.
• Extensive digital connectivity with DP helps future-proof your monitor.
• Single USB Type-C to supply power to compatible notebook while receiving video
signal.
• USB-C and RJ45 ports enable a single-cable, network-connected experience.
• Plug and play capability if supported by your computer.
• On-Screen Display (OSD) adjustments for ease of set-up and screen
optimization.
• Power and OSD buttons lock.
• Security lock slot.
• ≤ 0.3 W in Standby Mode.
• Premium Panel Exchange for peace of mind.
• Optimize eye comfort with a flicker-free screen minimizes hazard blue light
emission.
• The Monitor use Low Blue Light panel and compliance with TUV Rheinland
(Hardware Solution) at factory reset/default setting model.
• Decreases the level of hazard blue light emitted from the screen to make viewing
more comfortable for your eyes.
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.
About your monitor | 7
Identifying parts and controls
Front view
Label Description Use
1 Power LED indicator Solid white light indicates
the monitor is turned on and
functioning normally. Blinking white
light indicates the monitor is in
Standby Mode.
1
8 | About your monitor
Back view
7
1
2
3
654
Label Description Use
1 VESA mounting holes (100 mm
x 100 mm-behind attached
VESA cover)
2 Regulatory label Lists the regulatory approvals.
3 Stand release button Releases stand from the monitor.
4 Power On/Off button To turn the monitor on or off.
5 Joystick Use it to control the OSD menu.
6 Mac address, Barcode, serial
number, and Service Tag label
7 Cable-management slot Use to organize cables by inserting them
Wall mount monitor using VESAcompatible wall mount kit (100 mm x 100
mm).
For more information, see Operating the
Monitor.
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 computer and
access warranty information.
through the slot.
About your monitor | 9
Bottom view
99
13
1 4 5 6 7 8
Label Description Use
1 Security lock slot Secures monitor with security cable lock (sold separately).
2 Power connector Connect the power cable.
3 HDMI port Connect your computer with the HDMI cable.
4 DisplayPort in Connect your computer with the DisplayPort cable.
5 USB Type-C/
DisplayPort
6 DP port (out) DP output for MST (multi-stream transport) capable
7,9,1 1 SuperSpeed USB
5 Gbps (USB 3.2
Gen1) (3)
8 Audio line-out
port
32 11 129 10
Connect to your computer using the USB Type-C cable.
The USB Type-C port offer the fastest transfer rate and
the alternate mode with DP 1.4 support the maximum
resolution of 1920 x 1200 at 60 Hz PD 20 V/4.5 A, 15 V/3 A,
9 V/3 A, 5 V/3 A.
NOTE: USB Type-C is not supported on Windows versions
that are prior to Windows 10.
monitor. To enable MST, refer to instruction on section
“Connecting the Monitor for DP MST Function”.
NOTE: Remove the rubber plug when using DP out
connector.
Connect your USB device. You can use these ports only
after you have connected the USB cable (Type-A to
Type-C or Type-C to Type-C) from the computer to the
monitor. Port with battery icon supports Battery
Charging Rev. 1.2.
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.
10 | About your monitor
10 RJ-45 connector Connect Internet. You can surf Internet via RJ45 only after
you have connected the USB cable(Type-A to Type-C or
Type-C to Type-C) from the computer to the monitor.
12 USB Type-C
downstream port
13 Stand lock Lock the stand to the monitor using a M3 x 8 mm screw
Port with icon supports 5 V/ 3 A.
Connect your USB device. You can use these ports only
after you have connected the USB cable (Type-A to
Type-C or Type-C to Type-C) from the computer to the
monitor.
(screw not included).
Monitor specifications
Screen type Active matrix - TFT LCD
Panel Type In-plane switching Technology
Aspect ratio 16:10
Viewable image dimensions
Diagonal 61.13 cm (24.1 in.)
Active Area
Horizontal 518.4 mm (20.40 in.)
Vertical 324.0 mm (12.76 in.)
Area 167961.6 mm2 (260.30 in.2)
Pixel pitch 0.27 mm x 0.27 mm
Pixel per inch (PPI) 93.95
Viewing angle
Horizontal 178° (typical)
Vertical 178° (typical)
Brightness 350 cd/m² (typical)
Contrast ratio 1000 to 1 (typical)
Display screen coating Anti-glare treatment of the front polarizer (3H) hard
coating
Backlight LED
Response Time (Gray to
Gray)
Color depth 16.78 million colors
5 ms (Fast mode)
8 ms (Normal mode)
About your monitor | 11
Color gamut* 99% sRGB
99% REC709
Calibration accuracy Delta E < 2 (average)
Connectivity • 1 x DP 1.4
• 1 x HDMI1 .4
• 1 x USB Type-C (Alternate mode with DisplayPort 1.4,
USB 3.2 Gen 1 upstream port, Power Delivery PD up
to 90 W)
• 1 x USB Type-C downstream (15 W), USB 3.2 Gen 1 (5
Gbps)
• 1 x DP (Out) with MST
• 2 x SuperSpeed USB 5 Gbps (USB 3.2 Gen 1)
• 1 x SuperSpeed USB 5 Gbps (USB 3.2 Gen 1) with BC
1.2 charging capability at 2 A (max)
• 1 x Analog 2.0 audio line out (3.5 mm jack)
• 1 x RJ45
Border width (edge of monitor to active area)
To p
Left/Right
Bottom
Adjustability
Height adjustable stand 150 mm
Tilt -5° to 21°
Swivel -45° to 45°
Pivot -90° to 90°
Cable management Yes
Dell Display Manager (DDM)
Compatibility
Security Security lock slot (cable lock sold separately)
6.2 mm
6.2 mm
9.1 mm
Easy Arrange
and other key features
* At panel native only, under Custom Mode preset.
Resolution specifications
Horizontal scan range 30 kHz to 83 kHz
Vertical scan range 49 Hz to 76 Hz
12 | About your monitor
Maximum preset resolution 1920 x 1200 at 60 Hz
(kHz)
(Hz)
(MHz)
Vertical)
VGA 720 x 400
31.47
70
28.322
-/+
VESA 640 x 480
37.57531.5
-/-
VESA 800 x 600
37.8 8
6040+/+
VESA 800 x 600
46.88
75
49.5
+/+
VESA 1024 x 768
48.36
6065-/-
VESA 1024 x 768
60.02
75
78.75
+/+
MAC 1152 x 864
67.575108
+/+
VESA 1280 x 1024
6460108
+/+
VESA 1280 x 1024
8075135
+/+
CVT 1600 x 900
55.99
60
118.25
+/+
CVT 1920 x 1080
67.560148.5
+/+
Video display capabilities (HDMI & DP & USB
Type-C alternate mode)
480i, 480p, 576i, 560p, 720p, 1080i,
1080p
Preset display modes
Display mode Horizontal
frequency
Vertical
frequency
Pixel
clock
VGA 640 x 480 31.47 60 25.175 -/-
CVT 1920 x 1200 74.04 60 154 + /+
Sync polarity
(Horizontal/
DP MST Multi-Stream Transport (MST) Modes
MST Source Monitor Maximum number of external monitors that can be
supported
1920 x 1200/60 Hz
1920 x 1200/60 Hz 2
NOTE: Maximum external monitor resolution supported is 1920 x 1200 60 Hz only.
USB-C MST Multi-Stream Transport (MST) Modes
OSD Dislay Info: Link rate(current) Maximum number of external monitors that can be
supported
1920 x 1200/60 Hz
About your monitor | 13
HBR3 2
HBR2 1
Electrical specifications
Video input signals • Digital video signal for each dierential line
Per dierential line at 100 ohm impedance
• DP/HDMI/USB Type-C signal input support
Input voltage/ frequency/current 100-240 VAC / 50 or 60 Hz ± 3 Hz / 2.1 A
(maximum)
Inrush current 120 V: 42 A (Max.)
240 V: 80 A (Max.)
Inrush current is measured at an ambient
temperature of 0°C.
Power Consumption 0.2 W (Off Mode)
0.2 W (Standby Mode)
17.2 W (On Mode)
186 W (Max)
16.16 W (Pon)
52.39 kWh (TEC)
1
As dened in EU 2019/2021 and EU 2019/2013.
2
Max brightness and contrast setting with maximum power loading on all USB ports.
3
Pon: Power consumption of On Mode as dened in Energy Star 8.0 version.
1
1
1
2
3
3
TEC: Total energy consumption in kWh as dened in Energy star 8.0 version.
This document is informational only and reects laboratory performance. Your product may perform dierently, 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 certied.
This product qualies 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 specied limit.
14 | About your monitor
Physical characteristics
Connector type • DP connector (include DP in and DP out)
• HDMI connector
• USB Type-C connector
• Audio line-out
• RJ45 connector
• USB Type-C downstream connector x 1
(Port with icon supports 5 V/3 A)
• USB 3.2 Gen 1 downstream port connector x 3
(Port with battery icon supports BC 1.2.)
Signal cable type DP to DP 1.8 M cable
USB Type-C (C to C) 1.0 M cable
USB Type-C (C to A) 1.8 M cable
Dimensions (with stand)
Height (extended) 510.7 mm (20.11 in.)
Height (compressed) 364.0 mm (14.33 in.)
Width 530.8 mm (20.90 in.)
Depth 173.0 mm (6.81 in.)
Dimensions (without stand)
Height 339.3 mm (13.36 in.)
Width 530.8 mm (20.90 in.)
Depth 50.0 mm (1.97 in.)
Stand dimensions
Height (extended) 410.8 mm (16.17 in.)
Height (compressed) 364.0 mm (14.33 in.)
Width 244.9 mm (9.64 in.)
Depth 173.0 mm (6.81 in.)
Weight
Weight with packaging 8.6 kg (19.0 lb)
Weight with stand assembly and
cables
6.1 kg (13.4 lb)
About your monitor | 15
Weight without stand assembly
(For wall mount or VESA mount
considerations - no cables)
Weight of stand assembly 1.7 kg (3.7 lb)
Environmental characteristics
Compliant Standards
• ENERGY STAR certified Monitor.
• EPEAT registered where applicable. EPEAT registration varies by country.
See www.epeat.net for registration status by country.
• TCO Certified Display.
• RoHS Compliant.
• BFR/PVC Free monitor (excluding external cables).
• Meets NFPA 99 leakage current requirements.
• 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 5,000 m (16,404 ft) (maximum)
Non-operating 12,192 m (40,000 ft) (maximum)
Thermal dissipation 635.0 BTU/hour (Maximum)
4.0 kg (8.8 lb)
58.72 BTU/hour (On mode)
16 | About your monitor
Pin assignments
DP port (in)
Pin number 20-pin side of theconnected signal cable
1 ML3(n)
2 GND
3 ML3(p)
4 ML2(n)
5 GND
6 ML2(p)
7 ML1(n)
8 GND
9 ML1(p)
10 ML0(n)
11 GND
12 ML0(p)
13 CONFIG1
14 CONFIG2
15 AUX CH (p)
16 GND
17 AUX CH (n)
18 Hot Plug Detect
19 Return
20 DP_PWR
About your monitor | 17
DP port (out)
Pin number 20-pin side of theconnected signal cable
1 ML0(p)
2 GND
3 ML0(n)
4 ML1(p)
5 GND
6 ML1(n)
7 ML2(p)
8 GND
9 ML2(n)
10 ML3(p)
11 GND
12 ML3(n)
13 CONFIG1
14 CONFIG2
15 AUX CH(p)
16 GND
17 AUX CH(n)
18 Hot Plug Detect
19 Return
20 DP_PWR
18 | About your monitor
HDMI port
Pin number 19-pin side of theconnected 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 +5 V POWER
19 HOT PLUG DETECT
About your monitor | 19
USB Type-C port
Pin Signal Pin Signal
A1 GND B12 GND
A2 SSTXp1 B11 SSRXp1
A3 SSTXn1 B10 SSRXn1
A4 VBUS B9 VBUS
A5 CC1 B8 SBU2
A6 Dp1 B7 Dn1
A7 Dn1 B6 Dp1
A8 SBU1 B5 CC2
A9 VBUS B4 VBUS
A10 SSRXn2 B3 SSTXn2
A11 SSRXp2 B2 SSTXp2
A12 GND B1 GND
20 | About your monitor
Universal Serial Bus (USB)
This section gives you information about the USB ports available on your monitor.
NOTE: Up to 2 A on USB downstream port (port with battery icon) with
BC 1.2 compliance devices; up to 0.9 A on the other 2 USB downstream ports;
Up to 3 A on USB Type-C downstream port (port with icon) with 5 V/3 A
compliance devices.
Your computer has the following USB ports:
• 4 downstream - 2 at quick access, 2 at rear
Power Charging Port - the ports with battery icon supports fast current
charging capability if the device is BC 1.2 compatible.The USB Type-C downstream
port with icon supports fast current charging capability if the device is 5V/3A
compatible.
NOTE: The monitor’s USB ports work only when the monitor is on or in the power
save mode. In power save mode, if the USB cable (Type-C to Type-C) is plugged
in, the USB ports can work normally. Otherwise, follow the OSD setting of USB,
if the setting is “On During Standby” then USB work normally, otherwise USB is
disabled. If you turn off the monitor and then turn it on, the attached peripherals
may take a few seconds to resume normal functionality.
Transfer speed Data rate Maximum power consumption (each port)
SuperSpeed 5 Gbps 4.5 W
Hi-Speed 480 Mbps 2.5 W
Full speed 12 Mbps 2.5 W
USB downstreamport
Pin number Signal Pin number Signal
1
2
3
4
5
VBUS
D-
D+
GND
StdA_SSRX-
6
7
8
9
Shell
StdA_SSRX+
GND_DRAIN
StdA_SSTX-
StdA_SSTX+
Shield
About your monitor | 21
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