Dell S2721HGF Istruzioni per l’uso

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

Power button

power key

Mid cover

Power mylar

Power board

Interface board

Main chassis

Back cover

Stand

OSD+Joysick board

OSD button

Joystick button

3. Wiring Connectivity Diagram

AC INPUT

110V/220V

LED DRIVER

POWER BOARD

LCD PANEL

27" 16:9 1920*1080@144Hz

INTERFACE BOARD

LCD1

HDMI1.4

HDMI1 DP1

DP1.2

Headphone

out

AC JACK

LCD2

Function Key BD

KB1

HDMI1.4

HDMI2

LED1

LED key Board

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

function key cable and power key cable from the

connectors of the interface board, and then remove

the rear cover.

Put the rear cover on a protective cushion. Use a

Philips-head screwdriver to remove 4pcs screws for

unlocking the function key board with the rear cover.

Tear off the key tapes and release the function key

board from the hook of the rear cover.

(No.1~4 screw size=M2x0.2, Torque=0.8±0.2kgfxcm)

Tear off all the adhesive tapes for releasing the panel

lamp cable, then disconnect the panel cable away

from the connector of the panel module.

Necessary repair and test equipment:

1. Philips-head screwdriver

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to remove 6pcs

screws for unlocking the middle bezel with the front

bezel. Use a Philips-head screwdriver to remove

13pcs screws for unlocking the middle bezel with the

panel module. tear off 2pcs tapes of the power cable.

(No.1~6 Screw size=M2x3.8,Torque=3±0.5kgfxcm;

No.7~19 Screw size=M3x5, Torque=3~4kgfxcm)

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)

Move the bracket, and then disconnect the LVDS

cable and panel lamp cable from the connectors of

the panel module, then lift up the bracket and put it

on a protective cushion.

Lift up the panel module and pull out the front bezel

for releasing the front bezel.

S11

Remove the middle bezel and put it into a fixture jip,

then tear off the black PVC tape and 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

4. Disassembly and Assembly Procedures

Remove the circuit boards from the

disconnect all of the cables.

bracket carefully,

and then

S14

Use a Philips-head screwdriver to remove

screws for unlocking circuit boards, and then release

the panel lamp 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)

S13

Turn over the bracket chassis module. Remove the

Mylar from the hooks of the bracket.

S12

4. Disassembly and Assembly Procedures

Take 1pcs power board, then connect 1pcs panel

lamp cable to connect with the power board. Turn

over the power board and put it into the bracket.

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 LVDS cable

and 1pcs lamp cable to the interface board(b.c), then

connect the connective cable 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 panle lamp cable into the hook of the bracket.

(No.1 screw size=M4x8, Torque=7±0.5kgfxcm;

No.2~6 screw size=M3x7.5, Torque=7±0.5kgfxcm)

Panel preparation: Take out 1pcs panel module from

the carton, then remove the protective film by tearing

off the tapes, and then examine the panel surface

according to inspection criteria. Turn over the panel,

and then place screen faced down for later

assembling.

Take 1pcs mylar to insert the hooks of the bracket to

cover the power board, then locate the panel lamp

cable into the hook as the picture below shown.

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

then assemble the front bezel with the panel module

unit.

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to tighten 6pcs

screws for locking the middle bezel with front bezel.

(No.1~6 Screw size= M2x3.8, Torque=3±0.5kgfxcm)

S10

Take 1pcs power key board and 1pcs middle bezel,

then locate the power key board to the specific

position of the middle bezel. Put the unit into a fixture,

and then use a Philips-head screwdriver to tighten

1pcs screw for locking the power key board with the

middle bezel. Cover the power key board with 1pcs

black adhesive tape.

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

Assemble the middle bezel unit with the front bezel

and panel module.

Take the long panel lamp cable to connect with the

connector of the panel module, then tear off the

adhesive tape paper on the back of the cable and fix

the lamp cable with 3pcs adhesive tapes. Cover the

long lamp connector with 1pcs black PVC tape, then

connect the power key cable with the board.

S11

S12

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

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

Put the bracket on the back of the panel module.

Connect the LVDS cable and short panel lamp cable

to the two connectors of the panel model.

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

on the back of the cable. 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)

S9 S13

4. Disassembly and Assembly Procedures

Locate the function key board with Joystick key to the

specific position of the rear cover, then use a Philips-

head screwdriver to tighten 4pcs screws for locking

the function 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

S17

Take 1pcs joystick key and 1pcs function key board,

assemble the joystick key with the function key board,

then press the joystick key to check if it work

normally.

S14

Take 1pcs rear cover, put the rear cover on a cushion

foam for later assembling.

S15

Move the assembled rear cover with function key

board close to the assembled unit, then connect

unction key cable to the connector of interface

board. Put down the rear cover and push the rear

cover for mechanisms engagement. Paste 1pcs

label on the specific positions of the rear cover as

the picture below shown.

Take a stand 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.

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

S18

Take 1pcs base, assemble the base with the stand,

then use a screwdriver to tighten the detached screw

clockwise for locking the stand with base.

4. Disassembly and Assembly Procedures

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