Dell S2721DGF User manual

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)
Take out all accessories including QSG, user’s
manual, DP cable, HDMI cable, USB cable, power
cable and other packing materials from the
carton.(Note: It depends on whether users returning
the accessories)
S2
Open the carton with a proper tool.
S1
Take out the monitor from EPE-bag and put the LCD
monitor on a protective cushion.
23
41
Take out the base and molded pulp from the carton.
S3
S4
S6
QSG
USB cable DP cable
power cable User’s manual
S5
S7
base
stand
4
3
2
3
1
HDMI cable
DELL S2721DGF
Lift the rear cover up carefully. Disconnect the USB
FFC cable, joystick key cable and power key cable
from the connectors of the interface board, and then
disconnect the back LED light bar cable from the
connector of the power board, and then remove the
rear cover.
monitor
stand
1
1. Disassembly Procedures:

S10
2DELL S2721DGF
Use a Philips-head screwdriver to remove one screw
for unlocking the USB board unit, then release the
USB board unit and put it aside.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
S8
Tear off all the mylar and tapes, then use a Philips-
head screwdriver to remove 7pcs screws for
releasing the diffuser, reflector and LGP.
Remove the middle bezel and put it into a fixture jip,
then 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)
S9
S11
S13
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking the joystick key board with the
rear cover. Tear off the joystick key tapes and release
the joystick key board from the hook of the rear cover.
(No.1~4 screw size=M2x0.2, Torque=0.8±0.2kgfxcm)
1
1
2
4
3
1
6
5
42
3
7
Tear off the mylar tape on the position as the picture
below shown. Use a Philips-head screwdriver to
remove 13pcs screws for unlocking the middle bezel
with the panel module. Use a Philips-head
screwdriver to remove 2pcs screws for unlocking the
middle bezel with the front bezel.
(No.1~13 Screw size= M3x5, Torque=3~4kgfxcm;
No.14~15 Screw size= M2x2.7,Torque=1~2kgfxcm)
S12
Tear off all the adhesive tapes for releasing the panel
lamp cable, then disconnect the cable away from the
connectors of the power board and panel.
1

Remove the circuit boards from the
disconnect all
of the cables.
bracket
chassis module carefully, and then
S18
Turn over the bracket chassis module. Use a Philips-
head screwdriver to remove screws for
unlocking power board and interface board, and
then release the EDP 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)
S17
3
DELL S2721DGF
Lift up the panel module and pull out the front bezel
for releasing the front bezel.
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)
S14
S15
Tear off the adhesive tape, and then disconnect the
EDP cable from the connector of the panel module,
then put the bracket chassis on a protective cushion.
S16
23
4
1
3
4
2
1
56

4DELL S2721DGF
Remove electrolyte capacitors (red mark) from
printed circuit boards.
S19
S19-1 Cut the glue between bulk cap. and PCB with a knife.
S19-2 Ensure cutting path within the glue, don’t touch bulk
cap. or PCB.
S19-4 Take out bulk cap. pin solder with soldering iron and
absorber.
S19-5 Lift the bulk cap. up and away from the PCB.
S19-3 Cut into the bottom of bulk cap. and pullit up
carefully.

5
DELL S2721DGF
The following substances, preparations, or components should be disposed of or
recovered separately from other WEEE in compliance with Article 4 of EU Council
Directive 75/442/EEC.
Capacitors / condensers (containing
PCB/PCT)
No used
Mercury containing components
No used
Batteries
No used
Printed circuit boards (with a surface
greater than 10 square cm)
Product has printed circuit boards (with a
surface greater than 10 square cm)
Component contain toner, ink and
liquids
No used
Plastic containing BFR
No used
Component and waste contain
asbestos
No used
CRT
No used
Component contain CFC, HCFC, HFC
and HC
No used
Gas discharge lamps
No used
LCD display > 100 cm2
Product has an LCD greater than 100 cm2
External electric cable
Product has external cables
Component contain refractory
ceramic fibers
No used
Component contain radio-active
substances
No used
Electrolyte capacitors (height
> 25mm, diameter > 25mm)
Product has electrolyte capacitors (height >
25mm, diameter > 25mm)
3. Tools Required
List the type and size of the tools that would typically can be used to disassemble the
product to a point where components and materials requiring selective treatment
can be removed.
Tool Description:
- Screwdriver (Phillip head) #1
- Screwdriver (Phillip head) #2
- Penknife
- Soldering iron and absorber
2. Product material information