Dell S2721HGF Instructions for use

Product Announcement:
This product is certificated to meet RoHS
Directive and Lead-Free produced definition.
Using approved critical components only is
recommended when the situation to replace
defective parts. Vender assumes no liability
express or implied, arising out of any unauthorized
modification of design or replacing non-RoHS
parts. Service providers assume all liability.
Qualified Repairability:
Proper service and repair is important to the safe,
reliable operation of all series products. The
service providers recommended by vender should
be aware of notices listed in this service manual in
order to minimize the risk of personal injury when
perform service procedures. Furthermore, the
possible existed improper repairing method may
damage equipment or products. It is recommended
that service engineers should have repairing
knowledge, experience, as well as appropriate
product training per new model before performing
the service procedures.
NOTICE:
! To avoid electrical shocks, the products should be
connected to an authorized power cord, and turn
off the master power switch each time before
removing the AC power cord.
! To prevent the product away from water or
expose in extremely high humility environment.
! To ensure the continued reliability of this
product, use only original manufacturer’s
specified parts.
! To ensure following safety repairing behavior, put
the replaced part on the components side of
PWBA, not solder side.
! To ensure using a proper screwdriver, follow the
torque and force listed in assembly and
disassembly procedures to unscrew screws.
! Using Lead-Free solder to well mounted the
parts.
! The fusion point of Lead-Free solder requested in
the degree of 220°C.
1. Important Safety Notice

2. Exploded view diagram with list of items
Front trim
Panel
Power button
power key
Mid cover
Power mylar
Power board
Interface board
Main chassis
Back cover
Stand
OSD+Joysick board
OSD button
Joystick button

3. Wiring Connectivity Diagram
AC INPUT
110V/220V
LED DRIVER
POWER BOARD
LCD PANEL
27" 16:9 1920*1080@144Hz
INTERFACE BOARD
LCD1
HDMI1.4
HDMI1 DP1
DP1.2
Headphone
out
AC JACK
LCD2
Function Key BD
KB1
HDMI1.4
HDMI2
LED1
LED key Board

4. Disassembly and Assembly Procedures
S2
4.1 Disassembly Procedures:
S1
S3
Remove the monitor stand base:
1. Place the monitor on a soft cloth or cushion.
2. Press and hold the stand-release button.
3. Lift the stand up and away from the monitor.
Wedge your fingers between the rear cover and the
middle bezel on the corners of the top side of the
monitor to release the rear cover, then use one hand
to press the middle bezel, the other hand to pull up
carefully the rear cover in order of arrow preference
for unlocking mechanisms of rear cover.
Use a Philips-head screwdriver to remove four
screws for unlocking mechanisms.
(No.1~4 screw size=M4x8; Torque=10~11kgfxcm)
S4
23
41
Lift the rear cover up carefully. Disconnect the
function key cable and power key cable from the
connectors of the interface board, and then remove
the rear cover.
4
3
2
3
1
Put the rear cover on a protective cushion. Use a
Philips-head screwdriver to remove 4pcs screws for
unlocking the function key board with the rear cover.
Tear off the key tapes and release the function key
board from the hook of the rear cover.
(No.1~4 screw size=M2x0.2, Torque=0.8±0.2kgfxcm)
Tear off all the adhesive tapes for releasing the panel
lamp cable, then disconnect the panel cable away
from the connector of the panel module.
1
3
4
2
S5
S6
Necessary repair and test equipment:
1. Philips-head screwdriver

4. Disassembly and Assembly Procedures
Use a Philips-head screwdriver to remove 6pcs
screws for unlocking the middle bezel with the front
bezel. Use a Philips-head screwdriver to remove
13pcs screws for unlocking the middle bezel with the
panel module. tear off 2pcs tapes of the power cable.
(No.1~6 Screw size=M2x3.8,Torque=3±0.5kgfxcm;
No.7~19 Screw size=M3x5, Torque=3~4kgfxcm)
23
4
1
U
.
se a Philips-head screwdriver to remove 4pcs
screws for locking the bracket chassis module with
the panel
(No.1~4 Screw size= M3x0.5x2.8, Torque=5~6kgfxcm)
Move the bracket, and then disconnect the LVDS
cable and panel lamp cable from the connectors of
the panel module, then lift up the bracket and put it
on a protective cushion.
S7
S8
S9
Lift up the panel module and pull out the front bezel
for releasing the front bezel.
S11
Remove the middle bezel and put it into a fixture jip,
then tear off the black PVC tape and use a Philips-
head screwdriver to remove 1pcs screw for unlocking
the power key board with the front bezel.
(No.1 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)
S10
1

4. Disassembly and Assembly Procedures
Remove the circuit boards from the
disconnect all of the cables.
bracket carefully,
and then
S14
Use a Philips-head screwdriver to remove
screws for unlocking circuit boards, and then release
the panel lamp cable from the hook of the bracket.
6pcs
(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;
No.2~7 screw size=M3x7.5, Torque=6±0.5kgfxcm)
S13
Turn over the bracket chassis module. Remove the
Mylar from the hooks of the bracket.
S12
3
4
2
1
56

4. Disassembly and Assembly Procedures
Take 1pcs power board, then connect 1pcs panel
lamp cable to connect with the power board. Turn
over the power board and put it into the bracket.
Place a bracket chassis base on a protective
cushion, then stick 1pcs Silicon sheet on the position
as the picture below shown.
4.2 Assembly Procedures:
S2
S1
S3
Take 1pcs interface board, connect 1pcs LVDS cable
and 1pcs lamp cable to the interface board(b.c), then
connect the connective cable to the interface board.
Turn over the interface board and locate it into the
bracket. Use a Philips-head screwdriver to tighten
6pcs screws for locking the circuit board, then locate
the panle lamp cable into the hook of the bracket.
(No.1 screw size=M4x8, Torque=7±0.5kgfxcm;
No.2~6 screw size=M3x7.5, Torque=7±0.5kgfxcm)
3
4
2
1
56
Panel preparation: Take out 1pcs panel module from
the carton, then remove the protective film by tearing
off the tapes, and then examine the panel surface
according to inspection criteria. Turn over the panel,
and then place screen faced down for later
assembling.
S6
Take 1pcs mylar to insert the hooks of the bracket to
cover the power board, then locate the panel lamp
cable into the hook as the picture below shown.
a
b
C
Take 1pcs front bezel, lift up the panel module and
then assemble the front bezel with the panel module
unit.
S4
S5

4. Disassembly and Assembly Procedures
Use a Philips-head screwdriver to tighten 6pcs
screws for locking the middle bezel with front bezel.
(No.1~6 Screw size= M2x3.8, Torque=3±0.5kgfxcm)
S10
S7
Take 1pcs power key board and 1pcs middle bezel,
then locate the power key board to the specific
position of the middle bezel. Put the unit into a fixture,
and then use a Philips-head screwdriver to tighten
1pcs screw for locking the power key board with the
middle bezel. Cover the power key board with 1pcs
black adhesive tape.
(No.1 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)
S8
1
Assemble the middle bezel unit with the front bezel
and panel module.
Take the long panel lamp cable to connect with the
connector of the panel module, then tear off the
adhesive tape paper on the back of the cable and fix
the lamp cable with 3pcs adhesive tapes. Cover the
long lamp connector with 1pcs black PVC tape, then
connect the power key cable with the board.
S11
S12
23
4
1
Adjust the bracket chassis module, and then u
.
se a
Philips-head screwdriver to tighten 4pcs screws for
locking the bracket chassis module with the panel
(No.1~4 Screw size= M3x0.5x2.8, Torque=5~6kgfxcm)
Put the bracket on the back of the panel module.
Connect the LVDS cable and short panel lamp cable
to the two connectors of the panel model.
Fix the power key cable by tear off 2pcs tape papers
on the back of the cable. Use a Philips-head
screwdriver to tighten 13pcs screws for locking the
middle bezel with the panel module.
(No.1~13 Screw size= M3x5, Torque=3~4kgfxcm)
S9 S13

4. Disassembly and Assembly Procedures
Locate the function key board with Joystick key to the
specific position of the rear cover, then use a Philips-
head screwdriver to tighten 4pcs screws for locking
the function key board with the rear cover. Tear off the
tape papers on the back of the key cable, and then fix
the key cable with tapes of the cable.
(No.1~4 screw size=M2x0.2, Torque=0.8±0.2kgfxcm)
S16
S17
Take 1pcs joystick key and 1pcs function key board,
assemble the joystick key with the function key board,
then press the joystick key to check if it work
normally.
S14
Take 1pcs rear cover, put the rear cover on a cushion
foam for later assembling.
S15
1
3
4
2
Move the assembled rear cover with function key
board close to the assembled unit, then connect
unction key cable to the connector of interface
board. Put down the rear cover and push the rear
cover for mechanisms engagement. Paste 1pcs
label on the specific positions of the rear cover as
the picture below shown.

Take a stand close to the monitor. Fit the two tabs on
the upper part of the stand into the grooves on the
back of the monitor, and then lower the stand so that
the monitor mounting area snaps onto the stand.
Lift up the monitor to checking the gap between the
front bezel with panel module , then provide power
supply and a video signal to the monitor , then turn on
the monitor for functionality check.
S20
S21
Use a Philips-head screwdriver to tighten 4pcs
screws for locking the rear cover with the assembled
unit. Paste 2pcs labels on the specific positions.
(No.1~4 screw size=M4x10; Torque=9±0.5kgfxcm)
S19
S18
23
41
Take 1pcs base, assemble the base with the stand,
then use a screwdriver to tighten the detached screw
clockwise for locking the stand with base.
4. Disassembly and Assembly Procedures

5. Trouble Shooting Instructions
Self-test
Your monitor provides a self-test feature that allows you to check whether your
monitor is functioning properly. If your monitor and computer are properly connected
but the monitor screen remains dark, run the monitor self-test by performing the
following steps:
1. Turn o both your computer and the monitor.
2. Unplug the video cable from the back of the computer. To ensure proper Self-
Test operation, remove all digital and the analog cables from the back of
computer.
3. Turn on the monitor.
The floating dialog box should appear on-screen (against a black background), if the
monitor cannot sense a video signal and is working correctly. While in self-test mode,
the power LED remains white. Also, depending upon the selected input, one of the
dialogs shown below will continuously scroll through the screen.
S2721HGF
The display will go into Standby mode in 4 minutes.
www.dell.com/support/S2721HGF
No DP Cable
Dell 27 Gaming Monitor
or
S2721HGF
The display will go into Standby mode in 4 minutes.
www.dell.com/support/S2721HGF
No HDMI 1 Cable
1
Dell 27 Gaming Monitor
or
S2721HGF
The display will go into Standby mode in 4 minutes.
www.dell.com/support/S2721HGF
No HDMI 2 Cable
2
Dell 27 Gaming Monitor
4. This box also appears during normal system operation if the video cable becomes
disconnected or damaged.
5. Turn o your monitor and reconnect the video cable; then turn on both your
computer and the monitor.
If your monitor screen remains blank after you use the previous procedure, check your
video controller and computer, because your monitor is functioning properly.

5. Trouble Shooting Instructions
Built-in diagnostics
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.
1
2
3
4
5
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. The monitor
then goes into the self-test mode.
3. Press and hold Button 5 for 4 seconds, system will pop OSD message, select
and press Button 1. A gray screen appears.
4. Carefully inspect the screen for abnormalities.
5. Move joystick (Button 1) to right. The color of the screen changes to red.
6. Inspect the display for any abnormalities.
7. Repeat steps 5 and 6 to inspect the display in green, blue, black, white, and text
screens.
The test is complete when the text screen appears. To exit, press Button 5 again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool,
the monitor is functioning properly. Check the video card and computer.

5. Trouble Shooting Instructions
Common problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions:
Common
Symptoms
What You
Experience
Possible Solutions
No Video/
Power LED off
No picture • Ensure that the video cable connecting the
monitor and the computer is properly connected
and secure.
• Verify that the power outlet is functioning
properly using any other electrical equipment.
• Ensure that the power button is depressed fully.
• Ensure that the correct input source is selected
in the Input Source menu.
No Video/
Power LED on
No picture or no
brightness
• Increase brightness and contrast controls via
OSD.
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video cable
connector.
• Run the built-in diagnostics.
• Ensure that the correct input source is selected
in the Input Source menu.
Missing Pixels LCD screen has
spots
• Cycle power on-off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information on Dell Monitor Quality
and Pixel Policy, see Dell Support site at:
https://www.dell.com/pixelguidelines.
Stuck-on Pixels LCD screen has
bright spots
• Cycle power On-Off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information on Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
https://www.dell.com/pixelguidelines.
Brightness
Problems
Picture too dim
or too bright
• Reset the monitor to factory settings.
• Adjust brightness and contrast controls via OSD.
Safety Related
Issues
Visible signs of
smoke or sparks
• Do not perform any troubleshooting steps.
• Contact Dell immediately.
Intermittent
Problems
Monitor
malfunctions 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.

5. Trouble Shooting Instructions
Common
Symptoms
What You
Experience
Possible Solutions
Missing Color Picture missing
color
• Perform monitor self-test.
• Ensure that the video cable connecting the
monitor to the computer is connected properly
and is secure.
• Check for bent or broken pins in the video cable
connector.
Wrong Color Picture color
not good
• Change the settings of the Preset Modes in the
Color menu OSD depending on the application.
• Adjust R/G/B value under Custom Color in Color
menu OSD.
• Change the Input Color Format to PC RGB or
YPbPr in the Color menu OSD.
• Run the built-in diagnostics.
Image retention
from a static
image left on
the monitor for
a long period of
time
Faint shadow
from the static
image displayed
appears on the
screen
• Set the screen to turn o after a few minutes
of screen idle time. These can be adjusted in
Windows Power Options or Mac Energy Saver
setting.
• Alternatively, use a dynamically changing
screensaver.
Product specific problems
Problem What you
experience
Possible solutions
Screen image is
too small
Image is
centered on
screen, but
does not fill
entire viewing
area
• Check the Aspect Ratio setting in the Display
menu OSD.
• Reset the monitor to factory settings.
Cannot adjust
the monitor
with the
buttons on the
front panel
OSD does not
appear on the
screen
• Turn o the monitor, unplug the monitor power
cable, plug it back, and then turn on the monitor.
No Input Signal
when user
controls are
pressed
No picture, the
LED light is
white
• Check the signal source. Ensure the computer
is not in the power saving mode by moving the
mouse or pressing any key on the keyboard.
• Check whether the signal cable is plugged
in properly. Connect the signal cable again, if
necessary.
• Reset the computer or video player.
The picture
does not fill the
entire screen
The picture
cannot fill the
height or width
of the screen
• Due to dierent video formats (aspect ratio) of
DVDs, the monitor may display in full screen.
• Run the built-in diagnostics.