Dell UltraSharp U2721DE 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, Delta-e
paper, user’s manual, DP 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.
1. Disassembly Procedures:
S1
Take out the monitor from EPE-bag and put the LCD
monitor on a protective cushion.
23
41
Take out the base, Paper-Top and stand from the
carton, then take out the monitor from the pizza
carton.
S3
S4
S6
Delta_E paper
QSG
USB cable
DP cable
power cable
User’s manual
S5
S7
base
stand
4
3
2
3
1
1
DELL U2721DE
Lift the rear cover up carefully. Disconnect the USB
FFC cable from the connector of the interface board,
and then remove the rear cover.

S10
2DELL U2721DE
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
1
Tear off 2pcs aluminium foils for unfixing the bracket,
then tear off 1pcs acetate tape for unlocking the
panel lamp cable.
Tear 1pcs shading mylar tape, then disconnect the
function key cable away from the connector, then
pull the function key cable highly for releasing the
function key cable as the picture below shown.
Use a Philips-head screwdriver to remove 5pcs
screws for unlocking the front bezel with the
assembled unit. Tear off 1pcs pvc tape.
(No.1~5 screw size=M2x2.7, Torque=3±0.5kgfxcm)
35
24 1
U
.
se a Philips-head screwdriver to remove 2pcs
screws(left and right) for unlocking the front bezel
with the panel module, then disassemble the front
bezel with the unit and put it aside
(No.1~2 Screw size= M3x0.5x4, Torque=3~4kgfxcm)
1
2
Tear off the mylar tape on the function key board,
then use a Philips-head screwdriver to tighten 3pcs
screws for locking the function key board with the
front bezel.
(No.1~3 Screw size= M2x2.4, Torque=1±0.2kgfxcm)
1
2
3
S9
S11
S12
S13

Use a Philips-head screwdriver to remove
screws for unlocking power board and interface
board and driver board.
7pcs
(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;
No.2~7 screw size=M3x7.5, Torque=6±0.5kgfxcm)
Remove the circuit boards from the
disconnect all
of the cables.
bracket
chassis module carefully, and then
S18
Turn over the bracket chassis module. Remove the
Mylar from the hooks of the bracket, and then use a
Philips-head screwdriver to remove screws for
unlocking AC power outlet.
two
(No.1~2 screw size=M3x10, Torque=6±0.5kgfxcm)
S19
S17
3
DELL U2721DE
Tear off 2pcs acetate tape, then disconnect the panel
lamp cables from the connectors of the panel module
and power board.
U
.
se a Philips-head screwdriver to remove 4pcs
screws for locking the bracket chassis module with
the panel
(No.1~4 Screw size= M3x0.5x3, Torque=5~6kgfxcm)
23
4
1
S14
S15
Lift up the bracket chassis, and disconnect the LVDS
cable and connective cable from the connectors of
the panel module, then put the bracket chassis on a
protective cushion.
4
3
2
1
5
6
21
7
S16

4DELL U2721DE
Remove electrolyte capacitors (red mark) from
printed circuit boards.
S20
S20-1 Cut the glue between bulk cap. and PCB with a knife.
S20-2 Ensure cutting path within the glue, don’t touch bulk
cap. or PCB.
S20-4 Take out bulk cap. pin solder with soldering iron and
absorber.
S20-5 Lift the bulk cap. up and away from the PCB.
S20-3 Cut into the bottom of bulk cap. and pullit up
carefully.

5
DELL U2721DE
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)
ϯ. 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
Ϯ. Product material information