Dell P2421DCc User manual

Monitor Model: P2421DC
Regulatory Model: P2421DCc
Dell 24 USB-C Monitor - P2421DC
User’s Guide

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 – 03
Rev. A01

│3
Contents
About your monitor ......................... 6
Package contents . . . . . . . . . . . . . . . . . . . . . . 6
Product features . . . . . . . . . . . . . . . . . . . . . . .8
Identifying parts and controls . . . . . . . . . . . . . . . .9
Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Monitor specifications . . . . . . . . . . . . . . . . . . . 13
Resolution specifications . . . . . . . . . . . . . . . . . . . . . . 14
Supported video modes . . . . . . . . . . . . . . . . . . . . . . . 15
Preset display modes . . . . . . . . . . . . . . . . . . . . . . . . 15
MST Multi-Stream Transport (MST) Modes . . . . . . . . . . . . 16
Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . 16
Physical characteristics. . . . . . . . . . . . . . . . . . . . . . . 17
Environmental characteristics . . . . . . . . . . . . . . . . . . . 18
Power management modes . . . . . . . . . . . . . . . . . . . . . 19
Plug and play capability . . . . . . . . . . . . . . . . . . 25
LCD monitor quality and pixel policy . . . . . . . . . . . 25
Maintenance guidelines . . . . . . . . . . . . . . . . . . 25
Cleaning your monitor. . . . . . . . . . . . . . . . . . . . . . . .25
Setting up the monitor...................... 26
Attaching the stand . . . . . . . . . . . . . . . . . . . . 26

4 │
Connecting your monitor . . . . . . . . . . . . . . . . . 28
Connecting the DP cable . . . . . . . . . . . . . . . . . . . . . . 28
Connecting the monitor for DP Multi-Stream Transport (MST)
function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Connecting the USB Type-C cable . . . . . . . . . . . . 29
Connecting the monitor for USB-C Multi-Stream Transport
(MST) function. . . . . . . . . . . . . . . . . . . . . . . 30
Organizing cables . . . . . . . . . . . . . . . . . . . . . 31
Removing the stand . . . . . . . . . . . . . . . . . . . . 32
Wall mounting (optional) . . . . . . . . . . . . . . . . . 33
Operating your monitor ..................... 34
Power on the monitor . . . . . . . . . . . . . . . . . . . 34
USB-C charging options . . . . . . . . . . . . . . . . . . 35
Using the control buttons . . . . . . . . . . . . . . . . . 35
OSD controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Using the On-Screen Display (OSD) menu . . . . . . . . 37
Accessing the OSD menu . . . . . . . . . . . . . . . . . . . . . . 37
Menu and Power button lock . . . . . . . . . . . . . . . . . . . . 49
OSD warning messages . . . . . . . . . . . . . . . . . . . . . . . 51
Setting up your monitor . . . . . . . . . . . . . . . . . . 55
Setting the maximum resolution . . . . . . . . . . . . . . . . . . 55
If you have a Dell desktop or a Dell portable computer with internet
access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
If you have a non Dell desktop, portable computer, or graphics card
55
Using the tilt, swivel, and vertical extension . . . . . . . 57
Tilt, Swivel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

│5
Vertical Extension . . . . . . . . . . . . . . . . . . . . . 57
Rotating the Monitor . . . . . . . . . . . . . . . . . . . . . . . . 58
Troubleshooting ............................61
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . 62
Setting USB-C Prioritization when USB-C Charging is set
to On During Power Off . . . . . . . . . . . . . . . . . . 64
Common problems . . . . . . . . . . . . . . . . . . . . . 65
Product-specific problems . . . . . . . . . . . . . . . . 68
Appendix..................................70
Safety Instructions. . . . . . . . . . . . . . . . . . . . . 70
FCC notices (U.S. Only) and other regulatory information70
Contacting Dell. . . . . . . . . . . . . . . . . . . . . . . 70

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 for more information 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
Stand riser
Stand base
Power cable (varies by
countries)

About your monitor │7
DP 1.2 cable ( 1.8 m length)
USB Type-C cable (C to C, 1.8
m length)
Cable Tie
∞Quick Setup Guide
∞Safety and Regulatory
Information

8 │About your monitor
Product features
The Dell P2421DC monitor has an active matrix, Thin-Film Transistor (TFT), Liquid
Crystal Display (LCD), anti-static, and LED backlight. The monitor features include:
∞60.45 cm (23.8 in.) viewable area display (measured diagonally). 2560 x 1440
resolution, with full-screen support for lower resolutions.
∞Wide viewing angle to allow viewing from a sitting or standing position, or while
moving from side-to-side.
∞Color gamut of 99% sRGB.
∞High Dynamic Contrast Ratio.
∞Tilt, swivel, height, and rotate adjustment capabilities.
∞Removable stand and Video Electronics Standards Association (VESA™) 100 mm
mounting holes for flexible mounting solutions.
∞Digital connectivity with DisplayPort and HDMI.
∞Equipped with 4 USB downstream ports.
∞Single USB Type-C to supply power to compatible notebook while receiving
video signal.
∞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 media includes an Information File (INF), Image
Color Matching File (ICM), and product documentation.
∞Security lock slot.
∞Stand lock.
∞Capability to switch from wide aspect to standard aspect ratio while maintaining
the image quality.
∞0.3 W standby power when in the sleep mode.
∞Optimize eye comfort with a flicker-free screen.
WARNING:The possible long-term effects of blue light emission from
the monitor may cause damage to the eyes, including eye fatigue, digital
eye strain, and so on. ComfortView feature is designed to reduce the
amount of blue light emitted from the monitor to optimize eye comfort.

About your monitor │9
Identifying parts and controls
Front view
1 2
Control buttons
Label Description Use
1Function buttons Use the function buttons to adjust
items in the OSD menu. (For more
information, see Using the control
buttons)
2Power On/Off button Use the power button to turn the
monitor On and Off.

10 │About your monitor
Back view
SVCTag:
1234567
ExpressService
Code:
123456 789 0
S/N:CN-012345-
TV100-96N-001V
-A00
Dateof Mfg/⭕ӝᰛᵕ⭕⭘ᰛᵕ: August. 2019
Q40G024N-700-XXA
⏨Წᱴ⽰ಞ
ශ:P2421DC
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100-240V 50/60Hz,2.5A
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DELL P2421DC
Q40G024N-700-XXA
DELL P2421DC
FlatPanelMonitor /Monitor Plano Panel /Moniteur écran plat /⏢Ღ亟⽪ಘ
ModelNo./Modelo /N°de modelo /ර㲏: P2720DCc
InputRang/Entrade /Daya Tegangan:100-240V 50/60Hz,2.5A
䕨ޕ䴫ⓀӔ⍱䴫༃100-240Կ⢩,2.5ᆹษ,50/60䎛㥢
Consumodeenergía en operación: xxxxx Wh
Удельнаямощностьрабочего режима - xxxxВт/см²
Потребляемаямощностьизделием в режиме ожидания - xx Вт
Потребляемаямощностьизделием в выключенном режиме - xx Вт
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somgiverforbindelse l skproppens jord.
Theequipmentmust be connected to an earthed mains socket-outlet.
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MadeinChina /сделанный в Китай /Fabriqué en Chine /ѣു㼳䙖䆜䃔ֵ⭞䚄ᓜᚆۭᇩ㿌࣑Ⱦ
www.dell.com/regulatory_compliance Raheen Business Park Limerick Ireland (for EU Only) 
CANICES-3(B)/NMB-3(B)
Thisdevicecomplies with part 15 of the FCC Rules. Operaonissubject to the following two condions:
(1)thisdevice may not cause harmful interference, and
(2)thisdevice must accept any interference received, including interference that may cause undesired operaon.
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RoHS
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IS13252 (Part 1)/
IEC60950-1
R-41018660
www.bis.gov.in
xxxxxxxxxxxxx
R-R-TPF-P2421DCc
㐔㷡㢬ڕTPVElectronics(Fujian) Co., Ltd.(for Korea)
㥐㦤㣄ڕL&TDisplayTechnology(Fujian)Ltd.(for Korea)
080-200-3800
2
3
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1
Back View with monitor stand
Label Description Use
1Cable management slot Use to organize cables by routing them
through the slot.
2VESA mounting holes (behind
VESA cover)
VESA mounting holes (100 mm x
100 mm). Use for Wall mounting the
monitor through a VESA-compatible
wall mount kit.
3Regulatory information label Lists the regulatory approvals.
4Stand release button Releases stand from monitor.
5Regulatory label (including
Barcode serial number and
Service Tag label)
Lists the regulatory approvals. 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.

About your monitor │11
Side view
1
Label Description Use
1USB 3.0 downstream
port x 2
Connect your USB device.
NOTE: You can only use this port after
you have connected the USB Type-C
cable to the computer and USB Type-C
port on the monitor.

12 │About your monitor
Bottom view
75
4
132 6 8
Bottom view without monitor stand
Label Description Use
1Power connector Connect the power cable (shipped with your monitor).
2Security-lock slot Secure your monitor using a security lock (purchased
separately) to prevent unauthorized movement of your
monitor.
3Stand lock
feature
To lock the stand to the monitor using a M3 x 6 mm
screw (screw not included).
4HDMI port Connect your computer with HDMI cable.
5DisplayPort (in) Connect your computer with DisplayPort cable
(shipped with your monitor).
6DisplayPort (out) DP output for MST (multi-stream transport) capable
monitor. DP 1.1 monitor can only be connected as the
last monitor in the MST chain. To enable MST, refer to
instruction on section “Connecting the monitor for DP
Multi-Stream Transport (MST) function”.
NOTE: Remove the rubber plug when use DP
out port.
7USB Type-C port You can attach the monitor to PC using a USB type C
cable (shipped with your monitor), to get the monitor
experience as below: support data transmission
speed up to USB 3.1. Display resolution up to 2560
x 1440@60 Hz on Display Port™ 1.2 alternate mode.
Power delivery of 20 V/3.25 A, 15 V/3 A, 9 V/3 A, 5
V/3 A.
NOTE: USB Type-C is not supported on
versions of Windows prior to Windows 10.

About your monitor │13
8USB 2.0
downstream
ports x 2
Connect your USB device.
NOTE: You can only use this port after you
have connected the USB Type-C cable to
the computer and USB Type-C port on the
monitor.
Monitor specifications
Model P2421DC
Screen type Active matrix-TFT LCD
Panel type In-Plane Switching Technology
Viewable image
Diagonal
Horizontal, Active Area
Vertical, Active Area
Area
604.5 mm (23.8 in.)
526.85 mm (20.75 in.)
296.35 mm (11.67 in.)
156132.00 mm2(242.16 in.2)
Pixel pitch 0.2058 mm x 0.2058 mm
Pixel per inch (PPI) 123
Viewing angle
Horizontal
Vertical
178° (typical)
178° (typical)
Luminance output 300 cd/m² (typical)
Contrast ratio 1000 to 1 (typical)
Faceplate coating Anti-glare with 3H hardness, Haze 25%
Backlight LED edgelight system
Response time (Gray to
Gray)
8 ms (Normal)
5 ms (Fast)
Color depth 16.7 Million colors, 8 Bit(6 Bit + A-FRC)
Color gamut 99% sRGB

14 │About your monitor
Connectivity 1 x HDMI 1.4
1 x DP 1.2 (in)
1 x DP 1.2 (out)
1 x USB Type-C port
2 x USB 3.0 port - Side
2 x USB 2.0 port - Bottom
Bezel width (edge of monitor to active area)
Top
Left/Right
Bottom
5.4 mm
5.5 mm
20.3 mm
Adjustability
Height adjustable stand
Tilt
Swivel
Pivot
130 mm
-5°to 21°
-45°to 45°
-90° to 90°
Dell display manager
compatibility
Easy Arrange and other key features
Security Security-lock slot (cable lock optional purchase)
Resolution specifications
Model P2421DC
Horizontal scan range 29 kHz to 113 kHz
Vertical scan range 49 Hz to 75 Hz (automatic)
Maximum preset
resolution
2560 x 1440 at 60 Hz

About your monitor │15
Supported video modes
Model P2421DC
Video display capabilities
(HDMI/DP)
480i, 480p, 576i, 576p, 720p, 1080i, 1080p,
1440p
Preset display modes
Display Mode
Horizontal
Frequency
(kHz)
Vertical
Frequency
(Hz)
Pixel Clock
(MHz)
Sync
Polarity
(Horizontal
/ Vertical)
VESA, 720 x 400 31.5 70.1 28.3 -/+
VESA, 640 x 480 31.5 59.9 25.2 -/-
VESA, 640 x 480 37.5 75.0 31.5 -/-
VESA, 800 x 600 37.9 60.3 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 +/+
VESA, 1152 x 864 67.5 75.0 108.0 +/+
VESA, 1280 x 768 47.8 59.9 79.5 -/+
VESA, 1280 x 1024 64.0 60.0 108.0 +/+
VESA, 1280 x 1024 79.9 75.0 135.0 +/+
VESA, 1600 x 1200 75.0 60.0 162.0 +/+
VESA, 1680 x 1050 65.3 60.0 146.3 -/+
VESA, 1920 x 1080 67.5 60.0 148.5 +/+
VESA, 1920 x 1200 74.6 59.9 193.3 -/+
VESA, 2048 x 1080 66.6 60.0 147.2 +/-
VESA, 2560 x 1440 88.8 60.0 241.5 +/-

16 │About your monitor
MST Multi-Stream Transport (MST) Modes
MST Source Monitor Maximum number of external monitor that can
be supported
2560 x 1440/60 Hz
2560 x 1440/60 Hz 2
NOTE: Maximum external monitor resolution supported is 2560 x 1440
60Hz only.
Electrical specifications
Model P2421DC
Video input signals HDMI 1.4, 600 mV for each differential line, 100 ohm
input impedance per differential pair
DP 1.2, 600 mV for each differential line, 100 ohm
input impedance per differential pair
USB Type-C, 600 mV for each differential line, 90
ohm input impedance per differential pair
AC input voltage/
frequency/current
100 VAC to 240 VAC / 50 Hz or 60 Hz ± 3 Hz / 2.5
A (typical)
Inrush current 120 V: 30 A (Max.) at 0 °C (cold start)
240 V: 60 A (Max.) at 0 °C (cold start)

About your monitor │17
Physical characteristics
Model P2421DC
Signal cable type ∞Digital: DP, 20 pins
∞Digital: USB Type-C, 24 pins
Dimensions (with stand)
Height (extended) 486.1 mm (19.14 in.)
Height (compressed) 356.1 mm (14.02 in.)
Width 537.8 mm (21.17 in.)
Depth 166.0 mm (6.54 in.)
Dimensions (without stand)
Height 322.1 mm (12.68 in.)
Width 537.8 mm (21.17 in.)
Depth 42.7 mm (1.68 in.)
Stand dimensions
Height (extended) 400.8 mm (15.78 in.)
Height (compressed) 353.4 mm (13.91 in.)
Width 206.0 mm (8.11 in.)
Depth 166.0 mm (6.54 in.)
Weight
Weight with packaging 7.69 kg (16.95 lb)
Weight with stand assembly
and cables
5.76 kg (12.70 lb)
Weight without stand
assembly (no cables)
3.77 kg (8.31 lb)
Weight of stand assembly 1.54 kg (3.40 lb)
Front-frame gloss Black frame 2-4 gloss units

18 │About your monitor
Environmental characteristics
Model P2421DC
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
∞Energy Gauge shows the energy level being consumed by the monitor in real
time.
Temperature
Operating 0 °C to 40 °C (32 °F to 104 °F)
Non-operating ∞Storage: -20 °C to 60 °C (-4 °F to 140 °F)
∞Shipping: -20 °C to 60 °C (-4 °F to 140 °F)
Humidity
Operating 10% to 80% (non-condensing)
Non-operating ∞Storage 10% to 90% (non-condensing)
∞Shipping 10% to 90% (non-condensing)
Altitude
Operating (maximum) 5,000 m (16,400 ft)
Non-operating (maximum) 12,192 m (40,000 ft)
Thermal dissipation ∞444.60 BTU/hour (maximum)
∞83.79 BTU/hour (typical)

About your monitor │19
Power management modes
If you have VESA's DPM 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 the computer detects input from
the keyboard, mouse or other input devices, the monitor automatically resumes
functioning. The following table shows the power consumption and signaling of this
automatic power saving feature.
* Zero power consumption in off mode can only be achieved by disconnecting the
power cable from the monitor.
VESA
Modes
Horizontal
Sync
Vertical
Sync
Video Power
Indicator
Power
Consumption
Normal
operation
Active Active Active White 127 W
(maximum)**
25 W (typical)
Active-off
mode
Inactive Inactive Blanked White
(Glowing )
Less than 0.3 W
Switch off - - - Off Less than 0.3 W
Power Consumption PON 17.7 W
Total Energy Consumption (TEC) 56.72 kWh
** Maximum power consumption with max luminance, and USB active.
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.

20 │About your monitor
NOTE: This monitor is ENERGY STAR certied.
This product qualies 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 specied limit.
NOTE:
PON: Power consumption of On Mode as dened in Energy Star 8.0 version.
TEC: Total energy consumption in KWh as dened in Energy Star 8.0
version.