Dell E2223HN Manual de usuario

Service Manual

LCD Monitor

E2223HN

Service Manual

Service Manual Versions and Revision

No. Version Release Date Revision

1.0

2022/01/26

Initial Release

Service Manual

1. Important Safety Notice

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.

Service Manual

2. Exploded view diagram with list of items

NOTE:

For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell:

1. Go to https://www.dell.com/support.

2. Verify your country or region in the Choose A Country/Region drop-down menu at the bottom-right

corner of the page.

3. Click Contact Us next to the country dropdown.

4. Select the appropriate service or support link based on your need.

5. Choose the method of contacting Dell that is convenient for you.

Service Manual

3. Wiring Connectivity Diagram

Service Manual

4. How to connect and disconnect power cable/ connectivity cable

WARNING: To change power cable/ connectivity cable, switch off power before unplugging the cable

and replugging in required cable.

Service Manual

5. Disassembly and Assembly Procedure

1. Remove Rear Cover Screw and Stand

Screws

a. Remove screws “1~6” on rear cover with

electric screwdriver

b. Torque: 12.0 +/- 0.5Kgf/cm, Phillips

screwdriver

4. Remove VGA screw

a. Remove screws “1~2” with electric

screwdriver

b. Torque: 12.0 +/- 0.5Kgf/cm, hex screwdriver

2. Remove Rear Cover

a. Pry off the back cover of the machine

with the aid of the dismantling fixture, in

the sequence of

“Bottom->Left/Right->Top”

5. Remove Chassis Screw

a. Remove screws “1~2” with electric

screwdriver

b. Torque: 3.5 +/- 0.5Kgf/cm, Phillips

screwdriver

b. Remove Light Bar and Keypad Cable:

a. Remove acetate cloth tape marked with

“1”, then remove light bar (grasp on Pin

then pull outwards to remove)

b. Remove Keypad cable “2”

6. Remove Aluminium Foil and LVDS Cable

a. Remove aluminium tape then remove LVDS

cable (Pinch on clips on the sides)

Start

Service Manual

7. Remove PCBA 1

a. Remove mylar (squared in red in the

upper picture)

b. Remove grounding screw “1” then

locking screws marked “2~5” with

electric screwdriver

c. Torque: 5.5 +/- 0.5Kgf/cm, Phillips

screwdriver

10. Remove Keypad

a. Remove keypad from front cover

(loosen hook circled in red first)

8. Remove PCBA 2

a. Remove PI board and IF board

b. Separate PI board from IF board

11. Remove Components on PI Board 1

a. Remove electrolyte capacitor >25mm height

(squared in red) from printed circuit boards

b. Cut the glue between bulk cap and PCBA with

knife – ensure cutting path within the glue,

don’t touch bulk cap and PCBA

9. Remove LVDS Cable and Light Bara

a. Remove light bar from PI board (grasp

on Pin then pull upwards to remove)

b. Remove LVDS cable from IF board (lift

cover before remove)

12. Remove Components on PI Board 2

a. Take out the capacitor pin solder with

soldering iron

b. Lift the bulk capacitor away from power

board

S7 S10

Service Manual

6. Trouble Shooting Instructions

Self-test

Your monitor provides a self-test feature that allows you to check if 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. Disconnect all video cables from the monitor. This way, the computer does not have to be involved.

3. Turn on the monitor.

If the monitor is working correctly, it detects that there is no signal and one of the following message appears. While in self-test mode, the

power LED remains white.

NOTE: This message also appears during normal operation, when the video cable is disconnected or

damaged.

4. Turn off your monitor and reconnect the video cable; then turn on your computer and the monitor.

If your monitor remains dark after you reconnect the cables, check your video controller and computer.

Service Manual

6. Trouble Shooting Instructions

Your monitor has a built-in diagnostic tool that helps you determine if any screen abnormality you experience is an inherent problem with

your monitor, or with your computer and video card.

To run the built-in diagnostics:

1. Ensure that the screen is clean (no dust particles on the surface of the screen).

2. Press and hold Button 4 for about 4 seconds and wait for a pop up menu.

3. Use Button 1 or 2 to select the and press to confirm. A gray test pattern appears at the beginning of the diagnostic program.

4. Carefully inspect the screen for abnormalities.

5. Press Button 1 to change the test patterns.

6. Repeat steps 4 and 5 to inspect the display in red, green, blue, black, white and text screens.

7. When in White color test screen, check for white color uniformity and if there white color appears greenish/reddish, etc.

8. Press Button 1 to end the diagnostic program.

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