Dell U2421E User manual

DELL U2421E 1

Use a Philips-head screwdriver to remove 4pcs

screws for unlocking mechanisms. Remove DP cap.

(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)

Take out all accessories including label(optinal), QSG,

Delta-E paper, DP cable, USB C to C cable(Type-C

cable), USB A to C 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 and molded plup from the carton,

then take out the monitor and stand from the carton.

Monitor

stand

base

Wedge your fingers between 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.

Lift the rear cover up carefully. Disconnect the

joystick key cable from the connector of the interface

board, and then remove the rear cover and put it

aside for later diasassembling.

Use a Philips-head screwdriver to remove 2pcs

screw for unlocking the key board, then tear off the

tapes and release the key board.

(No.1~2 screw size=M2x2.4, Torque=0.8~1kgfxcm)

Delta_E paper

QSG

USB C to C cable

DP cable

power cable

USB A to C cable

2DELL U2421E

S13

S10

S12

Use a Philips-head screwdriver to release 1 screws

for unlocking the USB board, then disconnect the

USB FFC cable away from the connector of the

interface board and remove the Usb board unit.

(No.1screw size=M3x6, Torque=4±0.5kgfxcm)

S11

Disconnect the LED cable from the connector of the

interface board. Use a Philips-head screwdriver to

remove 12pcs screws for unlocking the middle bezel

with front bezel.

(No.1~4 screw size=M3x5, )Torque=5±0.5kgfxcm

Lift up and take away the middle bezel, then put it on

a cushion foam. Tear off the tape on the back of

middle bezel for releasing the LED cable, then tear

off the mylar tape for releasing the LED board.

Tear off 1pcs conductive tape for uncovering the

panel lamp connector, then disconnect the panel

lamp cable from the panel and board.

910

Tear off 1pcs mylar tape for unfixing the panel lamp

cable, then release the panel lamp cable from the

hooks of the middle bezel.

DELL U2421E

S15

S16

Use a Philips-head screwdriver to remove

screws for interface board and power board.

7pcs

(No.1 screw size=M4x8, Torque=7±1kgfxcm;

No.2~7 screw size=M3x7.5, Torque=7±1kgfxcm)

S18

Remove the power board board and interface

board from the

disconnect all of the cables.

bracket chassis module carefully,

and then

S20

Remove the Mylar tape from the hooks of the

bracket.

S17

S19

Tear off 2pcs aluminum foil, and then use a

2pcs screws for

unlocking the bracket with panel module.

Philips-

head screwdriver to remove

(No.1~2 screw size=M3x4, Torque=5±0.5kgfxcm)

Move up the bracket, then push the earing-lock and

disconnect the LVDS cable away from the connectors

of the panel module.

Take away the bracket chassis module and then put

the bracket chassis module on a protective cushion.

4DELL U2421E

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 U2421E

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

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