Dell UltraSharp U2721DE Manual de usuario

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)

Open the carton with a proper tool.

1. Disassembly Procedures:

Take out the monitor from EPE-bag and put the LCD

monitor on a protective cushion.

Take out the base, Paper-Top and stand from the

carton, then take out the monitor from the pizza

carton.

Delta_E paper

QSG

USB cable

DP cable

power cable

User’s manual

base

stand

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)

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)

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)

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)

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

DELL U2721DE

Tear off 2pcs acetate tape, then disconnect the panel

lamp cables from the connectors of the panel module

and power board.

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)

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.

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.

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

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