Dell S2721DGFA Manuale utente

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

Mid

Frame

IF and

Power

Main

bracket

Joystick

Key

OSD key

Stand and

Base

3. Wiring Connectivity Diagram

2nwoD0.3BSU1nwoD0.3BSU

AC In

Power Board

Panel

Function Key Board

USB3.0

Down4

USB3.0

Down3

USB Board

Interface Board

Audio Line Out

HDMI 2.0DP 1.4

USB Up-Stream

HDMI 2.0

USB Down-Stream USB Down-Stream

Power Key Board

LED Light Bar

4. Disassembly and Assembly Procedures

4.1 Disassembly Procedures:

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)

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.

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)

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)

Necessary repair and test equipment:

1. Philips-head screwdriver

4. Disassembly and Assembly Procedures

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)

S10

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)

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.

Lift up the panel module and pull out the front bezel

for releasing the front bezel.

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)

S11

S12

4. Disassembly and Assembly Procedures

Remove the circuit boards from the

disconnect all

of the cables.

bracket

chassis module carefully, and then

S15

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)

S14

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.

S13

4. Disassembly and Assembly Procedures

Turn over a power board and put the power board

into the bracket chassis, settle the panel power

cable to the correct position.

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:

Take 1pcs interface board, connect 1pcs EDP cable

to the interface board, then connect the cable of the

power board 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 EDP cable

into the hook of the bracket.

(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;

No.2~6 screw size=M3x7.5, Torque=6±0.5kgfxcm)

Panel preparation: Take out 1pcs panel module from

the carton, remove the protective film by tearing off

the tapes, then Examine the panel surface

according to inspection criteria. Turn over the panel

to place screen faced down for later assembling.

Move the bracket chassis module close to the panel

module, and then put the bracket on the back of the

panel module. Connect the EDP cable to the

connector of the panel module, then fix the EDP

cable with tape on the back of cable as the picture

below shown.

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

module

(No.1~4 Screw size= M3x0.5x2.8, Torque=5~6kgfxcm)

4. Disassembly and Assembly Procedures

Fix the power key cable by tear off 2pcs tape papers

on the back of the cable. Paste 1pcs mylar tape on

the specific position of the panel as the picture below

shown. 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)

S10

Take 1pcs front bezel, lift up the panel module and

then assemble the front bezel with the panel module

unit.

Take 1pcs power key board, 1pcs key cable and

1pcs middle bezel, connect the key cable to the

connector of the power key board, and then locate

the power key board to the specific position of the

middle bezel. Put the unit into a fixture, use a Philips-

head screwdriver to tighten 1pcs screw for locking

the power key board with the middle bezel.

(No.1 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)

Assemble the middle bezel unit with the front bezel

and panel module. Use a Philips-head screwdriver to

tighten 2pcs screws for locking the middle bezel with

front bezel.

(No.1~2 Screw size= M2x2.7,Torque=1~2kgfxcm)

Take 1pcs panel lamp cable to connect the power

board and panel module, then locate the lamp cable

into the hooks of the middle bezel, then fix the lamp

cable with 3pcs adhesive tapes as the following

picture shown.

S11

Take 1pcs LGP, 1pcs reflector and 1pcs rear cover,

put the rear cover on a cushion foam, assemble the

LGP with the rear cover first, then assemble the

reflector with the LGP as the picture below shown.

S12

LGP

4. Disassembly and Assembly Procedures

Paste 1pcs mylar tape to cover the light unit, then fix

the light cable with 1pcs acetate tape as the picture

below shown. Paste 2pcs mylar tape to cover the

light bar unit as the picture below shown. Make sure

not light-leaking between the mylar tapes,

then

connect the light cable to the circuit board, and

provide power supply to the light bar to check if light

bar work normally.

Assemble 1pcs left diffuser mylar and 1pcs right

diffuser mylar with the left and right corners as the

following picture. Use a Philips-head screwdriver to

tighten 7pcs screws for locking the diffuser, reflector

and LGP with the rear cover.

(No.1~7 screw size=M3x3.5x7, Torque=2~3kgfxcm)

Take 1pcs joystick key board, plug key cable to the

joystick key board, then locate the joystick key board

to the specific position of the rear cover, then use a

Philips-head screwdriver to tighten 4pcs screws for

locking the joystick 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

S15

reflector

S13

Take 1pcs LED lamp cable and 1pcs LED light board,

connect the cable to the LED light board, then locate

the light cable into the hooks of the rear cover, then

past 1pcs acetate tape to cover the light unit.

S14

Take 1pcs USB board and 1pcs connective cable.

Connect the cable to the USB board, paste 1pcs

conductive foam on the USB board, then locate

the USB unit into the hooks of a rear cover. Use a

Philips-head screwdriver to tighten 1pcs screw for

locking the USB unit with the rear cover.

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

S17

Take a stand base 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. Stick an energy

label on top left bezel of the monitor for European

region; Stick an energy label on top right bezel of the

monitor for Australia and New Zealand.

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

Move the assembled rear cover close to the

panel unit, then connect light bar cable to the

connector of the power board, then connect the

power key cable, joystick key cable and USB FFC

cable to the connectors of interface board. Put

down the rear cover and push the rear cover for

mechanisms engagement.

S18

4. Disassembly and Assembly Procedures

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