Dell S2721NX Service Manual

Dell S2421HN/S2721HN/S2421NX/ S2721NX Monitor

User’s Guide

Model: S2421HN/S2721HN/S2421NX/S2721NX Regulatory model: S2421Ht/S2721Ht

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.

trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

2020 – 07

Rev. X00

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

Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . 13

Physical characteristics. . . . . . . . . . . . . . . . . . . . . . . 14

Environmental characteristics . . . . . . . . . . . . . . . . . . . 15

Power management modes . . . . . . . . . . . . . . . . . . . . . 16

Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Plug-and-play . . . . . . . . . . . . . . . . . . . . . . . 19

LCD monitor quality and pixel policy . . . . . . . . . . . 19

Ergonomics. . . . . . . . . . . . . . . . . . . . . . . . . 19

Handling and moving your display. . . . . . . . . . . . . 21

Maintenance guidelines . . . . . . . . . . . . . . . . . . 22

Cleaning your monitor. . . . . . . . . . . . . . . . . . . . . . . . 22

Contents | 3

Setting up the monitor.......................23

Connecting the stand . . . . . . . . . . . . . . . . . . . 23

Using the tilt . . . . . . . . . . . . . . . . . . . . . . . . 26

Connecting your monitor . . . . . . . . . . . . . . . . . 27

Organizing your cables . . . . . . . . . . . . . . . . . . 28

Securing your monitor using Kensington lock (optional) 28

Removing the monitor stand . . . . . . . . . . . . . . . 29

Wall mounting (Optional) . . . . . . . . . . . . . . . . . 30

Operating the monitor .......................31

Power on the monitor . . . . . . . . . . . . . . . . . . . 31

Using the front panel controls . . . . . . . . . . . . . . . 31

Using the OSD lock function . . . . . . . . . . . . . . . 33

Front-panel button. . . . . . . . . . . . . . . . . . . . . 35

Using the On-Screen Display (OSD) menu . . . . . . . . 36

Accessing the menu system . . . . . . . . . . . . . . . . . . . . 36

OSD warning messages . . . . . . . . . . . . . . . . . . . . . . . 47

Setting the maximum resolution . . . . . . . . . . . . . . . . . . 49

Troubleshooting ........................... 50

Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Built-in diagnostics . . . . . . . . . . . . . . . . . . . . 51

Common problems . . . . . . . . . . . . . . . . . . . . . 52

Product specific problems . . . . . . . . . . . . . . . . . 54

Appendix................................. 55

FCC notices (U.S. only) and other regulatory information 55

Contacting Dell. . . . . . . . . . . . . . . . . . . . . . . 55

Outline dimension ......................... 56

4 | Contents

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).

Safety instructions | 5

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

S2421/S2721 HN S2421/S2721 NX

Stand riser

Stand base

VESA cover

Power cable (varies by country)

6 | About your monitor

HDMI cable

Dell S2421HN(NX)/S2721HN(NX)

Dell S2421H/S2721H

HDMI

2020-07

HDMI2HDMI1

HDMI

HDMI HDMI

HDMIHDMI

HDMIMI

5°21°

Dell.com/S2421H Dell.com/S2721H

746.A3E01.0001 (DELL P/N: PNF73 rev.X01)

www.dell.com/contactdell

HDMI2HDMI1

1 4

2 3

HDMI

H DMI

HDMI

HDMIHDMI

HDMIMI

5° 21°

Dell.com/S2421HN/NX Dell.com/S2721HN/NX

746.A3E01.0001

(DELL P/N: PNF73 rev.X01)

www.dell.com/contactdell

•Quick Setup Guide

•Safety, Environmental, and

Regulatory Information

Product features

The Dell S2421HN/S2421NX/S2721HN/S2721NX monitor has an active matrix, Thin Film Transistor (TFT), Liquid Crystal Display (LCD), and LED backlight. The monitor features include:

• S2421HN/S2421NX: 60.45 cm (23.8 in.) active area display (Measured diagonally) 1920 x 1080 (16:9) resolution, plus full-screen support for lower resolutions.

• S2721HN/S2721NX: 68.6 cm (27 in.) active area display (Measured diagonally) 1920 x 1080 (16:9) resolution, plus full-screen support for lower resolutions.

• Tilt adjustment capability.

• 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 helps future-proof your monitor.

• Plug and play capability if supported by your system.

• On-Screen Display (OSD) adjustments for ease of set-up and screen

optimization.

• Supports AMD FreeSync 48HZ -75HZ.

• Power and OSD buttons lock.

• Security lock slot.

• 0.3 W standby power when in the standby 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 or digital eye strain. ComfortView feature is designed to reduce the amount of blue light emitted from the monitor to optimize eye comfort.

technology. AMD Freesync™ certified range from

About your monitor | 7

Identifying parts and controls

Front view

S2421HN/S2721HN

1 2

S2421NX/S2721NX

Label Description Use 1 Function buttons For more information, see Operating the

monitor

2 Power on/off button

(with LED indicator)

8 | About your monitor

To turn the monitor on or off.

Back view

1 2

DELL S2421HN

Flat Panel Monitor / Monitor Plano Panel / Monite ur à écran plat / 液晶顯示器 Model No. / N° de Modelo / Numéro de modèle /型號: S2421Ht Input Rating / Entrada / Daya Tegangan / Tension d’entrée : 100-240V ~ 50/60Hz 1.5A 輸入電源:交流電壓 100-240伏特, 1.5安培, 50/60赫茲

Made in China / Fabricado en China / Fabriqué en Chine / Сделано в Китае / 製造地:中國 Consumo de energía en operación: XX.XX Wh

Удельная мощность рабочего режима -X,XXX Вт/см

Потребляемая мощность изделием в режиме ожидания -X,XX Вт Потребляемая мощность изделием в выключенном режиме - X,XX Вт

Apparatet må tilkoples jordet stikkontakt. Apparaten skall anslutas till jordat uttag. Apparatets stikprop skal tilsluttes en stikkontakt med jord, som giver forbindelse til stikproppens jord. Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan. 신청인: Wistron Corporation (For Korea) Wistron InfoComm (Zhongshan) Corporation Linhai Branch 제조자: Wistron InfoComm (Zhongshan) Corporation Linhai Branch

A/S 연락처: 080-854-0066 제조국: 중국

CAN ICES-3 (B)/NMB-3(B) For UK only: Cain Road, Bracknell, RG12 1LF This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

DELL S2421HN

Flat Panel Monitor / 液晶显示器型号 : S2421HN Input Rating / 输入电源 :

100-240V ~ 50/60Hz 1.5A Made in China / 制造地:中国 Manufactured date / 制造日期:

IS 13252 (Part 1)/

IEC 60950-1

XXXXXX-XX

警語:使用過度恐傷害視力

R-41071650

XXXXXXXXXX

www.bis.gov.in

ID XXXXXXXXXX

Address for EU Only: Raheen Business Park Limerick Ireland www.dell.com/regulatory_compliance

XXXXXXXX-XXXXX

R-R-WT1-S2421Ht

И005-20

XXXXX

Flat Panel Monitor / 液晶显示器

DELL S2421HN

型号 : S2421HN

Input Rating / 输入电源 : 100-240V ~ 50/60Hz 1.5A Made in China / 制造地:中国

Manufactured date / 制造日期:

S2421HN/S2721HN

1 2

S2421NX/S2721NX

Label Description Use 1 VESA 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).

2 Regulatory label Lists the regulatory approvals. 3 Stand release button Release stand from monitor. 4 Barcode, 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.

5 Cable management slot Use to organize cables by placing them

through the slot.

About your monitor | 9

Bottom view

21 3 4 5

S2421HN/S2721HN

21 3 4 5

S2421NX/S2721NX

Label Description Use 1 Security lock slot Secures monitor with security cable lock (sold

separately).

2 Power connector Connect the power cable (shipped with your monitor).

3 HDMI port 1 Connect your computer with HDMI cable. 4 HDMI port 2 Connect your computer with HDMI cable. 5 Audio Line-out port Connect speakers to playback audio coming through

HDMI audio channel.

Only two-channel audio is supported.

NOTE: The audio line-out port does not support headphones.

10 | About your monitor

Monitor specifications

Model S2421HN/S2421NX S2721HN/S2721NX

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 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 mm

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 1000 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* NTSC 72%

Connectivity •2 x HDMI 1.4

•1 x Audio line-out(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

Height adjustable

stand

Tilt -5° to 21°

(242.15 in.2) 201073.02 mm2 (311.67 in.2)

About your monitor | 11

Swivel NA

Pivot NA

Cable management Yes

Dell Display Manager

Easy Arrange and other key features

(DDM)Compatibility

Security Security lock slot (cable lock sold separately)

* At panel native resolution only, under Custom Mode preset.

Resolution specifications

Model S2421HN/S2421NX/S2721HN/S2721NX

Horizontal scan range 30 kHz to 83 kHz

Vertical scan range 48 Hz to 75 Hz

Maximum preset

1920 x 1080 at 60 Hz

resolution

Video display capabilities

480i, 480p, 576i, 576p, 720p, 1080i, 1080p

(HDMI playback)

12 | About your monitor

Preset display modes

(Hz)

VGA, 640 x 480

31.5

60.0

25.2

-/-

MAC, 1152 x 864

67.5

75.0

108.0

+/+

CVT, 1920 x 1080

67.5

60.0

148.5

+/+

S2421HN/S2421NX/S2721HN/S2721NX

Display Mode Horizontal

Frequency (kHz)

VGA, 720 x 400 31.5 70.0 28.3 -/+

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 +/+

VESA, 1280 x 1024 64.0 60.0 108.0 +/+

VESA, 1280 x 1024 80.0 75.0 135.0 +/+ VESA, 1600 x 900 60.0 60.0 108.0 + /+

CVT, 1920 x 1080 83.89 75.0 174.5 +/-

Electrical specifications

Model S2421HN/S2421NX/S2721HN/S2721NX

Video input signals •Digital video signal for each dierential line

Input voltage/ frequency/ current

Inrush current 120 V: 30 A (maximum)

Vertical Frequency

Per dierential line at 100 ohm impedance

•HDMI signal input support 100-240 VAC / 50 or 60 Hz ± 3 Hz / 1.5 A

(maximum)

240 V: 60 A (maximum)

Pixel Clock (MHz)

Sync Polarity (Horizontal/ Vertical)

About your monitor | 13

Physical characteristics

Model

Connector type •2 x HDMI1.4 ports

Signal cable type 1.8 m HDMI1.4 cable

Dimensions (with stand)

Height

Width

Depth

Dimensions (without stand)

Height

Width

Depth

Stand dimensions

Height

Width

Depth

Weight

Weight with packaging 5.9 kg (13.00 lb.) 7.6 kg (16.76 lb.)

Weight with stand assembly and cables

Weight without stand assembly (For wall mount or VESA mount considerations - no cables)

Weight of stand assembly 0.5 kg (1.19 lb.) 0.7 kg (1.54 lb.)

S2421HN/S2421NX S2721HN/S2721NX

•1 x Audio line-out port

412.8 mm (16.25 in.) 453.3 mm (17.85 in.)

537.8 mm (21.17 in.) 609.9 mm (24.01 in.)

152.8 mm (6.02 in.) 186.8 mm (7.35 in.)

322.6 mm (12.70 in.) 363.6 mm (14.32 in.)

537.8 mm (21.17 in.) 609.9 mm (24.01 in.)

53.8 mm (2.12 in.) 54.0 mm (2.13 in.)

171.6 mm (6.76 in.) 176.0 mm (6.93 in.)

249.0 mm (9.80 in.) 257.2 mm (10.13 in.)

152.8 mm (6.02 in.) 186.8 mm (7.35 in.)

4.1 kg (9.04 lb.) 5.2 kg (11.46 lb)

3.3 kg (7.28 lb.) 4.3 kg (9.48 lb.)

14 | About your monitor

Environmental characteristics

Model S2421HN/S2421NX/S2721HN/S2721NX

Compliant Standards

•ENERGY STAR certified Monitor.

•TCO Certified Display.

•RoHS Compliant.

•BFR/PVC Reduce monitor (excluding external cables).

•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

S2421HN/S2421NX 71.65 BTU/hour (maximum)

54.59 BTU/hour (typical)

S2721HN/S2721NX 98.95 BTU/hour (maximum)

64.83 BTU/hour (typical)

About your monitor | 15

Power management modes

If you have VESA’s DPM-compliant video card or software installed in your PC, the monitor can automatically reduce its power consumption when not in use. This is referred to as standby 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.

S2421HN/S2421NX

VESA Modes

Normal operation

Active-off mode

Horizontal Sync

Vertical Sync

Video Power

Indicator

Power Consumption

Active Active Active White 21 W (maximum)**

16 W (typical)

Inactive Inactive Off White

Less than 0.3 W

(Glowing)

Switch off - - - Off Less than 0.3 W

Power Consumption P

11.74 W

Total Energy Consumption (TEC) 37.3 kWh

S2721HN/S2721NX

VESA Modes

Normal operation

Active-off mode

Horizontal Sync

Vertical Sync

Video Power

Indicator

Power Consumption

Active Active Active White 29 W (maximum)**

19 W (typical)

Inactive Inactive Off White

Less than 0.3 W

(Glowing)

Switch off - - - Off Less than 0.3 W

Power Consumption P

13.82 W

Total Energy Consumption (TEC) 43.68 kWh

16 | About your monitor

The OSD operates only in the normal operation mode. If you press any button in the active-off mode, the following message is displayed:

Dell 24 Monitor

No HDMI1 signal from your device.

Press any key on the keyboard or move the mouse to wake it up.

If there is no display, press the monitor button again to select

the correct input source.

S2421HN/S2421NX

Dell 27 Monitor

No HDMI1 signal from your device.

Press any key on the keyboard or move the mouse to wake it up.

If there is no display, press the monitor button again to select

the correct input source.

S2721HN/S2721NX

*Zero power consumption in OFF mode can only be achieved by disconnecting the AC mains cable from the monitor.

**Maximum power consumption with maximum luminance.

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.

Activate the computer and the monitor to gain access to the OSD.

NOTE: This monitor is ENERGY STAR certified.

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.

About your monitor | 17

NOTE:

: 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.

Pin Assignments

HDMI port

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 +5 V POWER

19 HOT PLUG DETECT

18 | About your monitor

+ 39 hidden pages