Dell S2421HS 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

3. Wiring Connectivity Diagram

Panle 1920*1080

Power Board

HDMI DPLine Out

FK BD

KB1

Interface 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 4pcs

screws for unlocking mechanisms.

(No.1~4 screw size=M4x11; Torque=7 8kgfxcm)~

Tear off 2pcs aluminum foils, and then disconnect

the function key cable away from the connector of

the board. Disconnect the panel lamp cable and

function key cable away from the connectors of the

panel module and board.

Use a Philips-head screwdriver to remove 2pcs

screws for unlocking the bracket chassis with panel

module.

(No.1~2 screw size=M3x3, Torque=3~4kgfxcm )

Use a Philips-head screwdriver to remove 16pcs

screws for unlocking the middle bezel.

(No.1~11 screw size=M3x4, Torque=3~4kgfxcm;

No.12~16 screw size=M2x3.3, Torque=1±0.2kgfxcm)

1 3

Necessary repair and test equipment:

1. Philips-head screwdriver

4. Disassembly and Assembly Procedures

Unplug the LVDS cable from the connector of the

panel module by pushing the earing-locks.

Lift up the middle bezel and take away the middle

bezel, and put it on a fixture. U

tear off the tapes for releasing the key cables.

se a Philips-head

screwdriver to remove 3pcs screws for unlocking the

function key board with the middle bezel, and then

(No.1~3 screw size=M2x2.4, Torque=0.8±0.2kgfxcm

tear off the tape.

ift up the panel module with the bracket chassis for

releasing the front bezel away from the panel

module, and then

Take away the bracket chassis module and then put

the bracket chassis module on a protective cushion.

Use a Philips-head screwdriver to remove 5pcs

screws for unlocking the circuit board, release all the

cables from the hooks.

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

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

S12

Remove the Mylar from the hooks of the bracket

chassis module.

S11

S10

4. Disassembly and Assembly Procedures

Remove the interface board and power board from

the bracket chassis module carefully, and disconnect

all the cables.

S13

4. Disassembly and Assembly Procedures

Take a mylar to insert the hooks of the bracket to

cover the power board.

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.

Turn over a power board and put the power board

into the bracket chassis, locate the panel power

cable into the hook of the bracket chassis.

Place a bracket chassis base on a protective

cushion.

4.2 Assembly Procedures:

Take a interface board, connect a LVDS cable to the

connector of the interface board, then connect the

cable of the power board to the connector of the

interface board. Turn over the interface board and

locate it into the bracket. Use a Philips-head

screwdriver to tighten 5pcs screws for locking the

power board and interface board.

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

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

Move the bracket chassis close to the panel module,

then connect LVDS cable to the connector of the

panel. Turn over the bracket and put it on the back

of panel.

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to tighten 2pcs

screws for locking the bracket with panel module.

(No.1~2 screw size=M3x3, Torque=3~4kgfxcm)

Take a function key board and a middle bezel, then

fix the middle bezel with a fixture, and locate the

function keyboard into the hooks of the bezel Use a

Philips-head screwdriver to tighten 3pcs screws for

locking the function key board with the middle bezel.

(No.1~3 screw size=M2x2.4, Torque=0.8±0.2kgfxcm

Tear off the papers of the tapes on the back of the

key cable, and then fix the function key cable on the

back of bezel by 1pcs tape, then assemble the

middle bezel with the front bezel and panel module.

S11

S10

Take 1pcs front bezel, then lift up the panel with

bracket and assemble the front bezel with the panel

module. Paste 1pcs tape to cover the LVDS connector.

S13

S14

S12

Paste 1pcs aluminum foil to fix bracket chassis as

the picture below shown. Paste 1pcs aluminum foil

to cover the LVDS connector.

Connect the function key cable to the connector of

board, then connect the panel lamp to the connector

of the panel module.

Use a Philips-head screwdriver to lock 11pcs screws

for locking the middle bezel with the panel module,

then lock 5pcs screws for locking the middle bezel

with front bezel.

(No.1~11 screw size=M3x4, Torque=3~4kgfxcm;

No.12~16 screw size=M2x3.3, Torque=1±0.2kgfxcm)

4. Disassembly and Assembly Procedures

Use a Philips-head screwdriver to tighten 4pcs

screws for locking rear cover with the assembled

unit.

(No.1~4 screw size=M4x11; Torque=7 8kgfxcm~)

Take 1pcs rear cover, put down the rear cover

and push the rear cover on the positions marked

as the picture below shown for mechanisms

engagement.

S15

S16

front bezel with panel module , then provide power

supply and a video signal to the monitor, then turn

on the monitor for functionality check.

ift up the monitor to checking the gap between the

S18

Stick 2pcs labels on the specific positions as the

picture below shown. Take 1pcs stand riser and

1pcs stand base, assemble the stand base with

stand riser, then rotate the screw clockwise to lock

the stand base and stand riser. Insert the stand-riser

into monitor groove until it snaps into its place.

S17

5. Trouble Shooting Instructions

Self-test

Your monitor provides a self-test feature that allows you to check whether your

monitor is functioning properly. If your monitor and computer are properly connected

but the monitor screen remains dark, run the monitor self-test by performing the

following steps:

1. Turn off both your computer and the monitor.

2. Unplug the video cable from the back of the computer. To ensure proper Self-Test

operation, remove all video cables from the back of computer.

3. Turn on the monitor.

The floating dialog box should appear on-screen (against a black background), if the

monitor cannot sense a video signal and is working correctly. While in self-test mode,

the power LED remains white. Also, depending upon the selected input, one of the

dialogs shown below will continuously scroll through the screen.

S2421HS/S2421HSX S2721HS/S2721HSX

Dell 24 Monitor

The display will go into Standby mode in 4 minutes.

No DP Cable

www.dell.com/S2421HS

www.dell.com/S2421HSX

S2421HS/S2421HSX

Dell 24 Monitor

No HDMI Cable

www.dell.com/S2421HS

S2421HS/S2421HSX

www.dell.com/S2421HSX

The display will go into Standby mode in 4 minutes.

Dell 27 Monitor

No DP Cable

www.dell.com/S2721HS

www.dell.com/S2721HSX

S2721HS/S2721HSX

The display will go into Standby mode in 4 minutes.

Dell 27 Monitor

No HDMI Cable

www.dell.com/S2721HS

S2721HS/S2721HSX

www.dell.com/S2721HSX

The display will go into Standby mode in 4 minutes.

4. This box also appears during normal system operation if the video cable is

disconnected or damaged.

5. Turn off your monitor and reconnect the video cable; then turn on both your

computer and the monitor.

If your monitor screen remains blank after you use the previous procedure, check your

video controller and computer, because your monitor is functioning properly.

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