Dell P2723QE LCD Monitor User Manual

Service Manual
LCD Monitor
P2723QE 

Service Manual Versions and Revision

No.| Version| Release Date| Revision
1| 1.0| 2022/02/14| Initial Release

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 is to replace defective parts. The vendor assumes no liability express or implied, arising out of any unauthorized modification of the design or replacing of non-RoHS parts. Service providers assume all liability.

Qualified Repairability:
Proper service and repair are important to the safe, reliable operation of all series products. The service providers recommended by the vendor should be aware of notices listed in this service manual in order to minimize the risk of personal injury when performing service procedures. Furthermore, the possibility existed improper repairing methods may damage equipment or products. It is recommended that service engineers should have repair 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 an extremely high humility environment! To ensure the continued reliability of this product, use only the original manufacturer’s specified parts.
! To ensure following safety repairing behavior, put the replaced part on the components side

Exploded view diagram with a list of items

Item

| Description| Q’TY|

Remark

---|---|---|---

1

| ASSY Front Trim|

1

|

For EMEA Only, not for other regions

2

| Panel|

1

3

| LED BD|

1

4

| ASSY Middle Frame|

1

5

| Side USB BD|

1

6

| Mylar- panel|

1

7

| Interface BD|

1

8

| Power BD|

1

9

| Mylar-side chassis|

1

10

| ASSY Main Chassis|

1

11

| Key BD|

1

12

| Joystick|

1

13

| ASSY Back Cover|

1

14

| ASSY Stand Riser|

1

15

| ASSY Stand Base|

1

16

| Power cord|

1

| See”NOTE”

17

| DP to DP (v1.4)|

1

| See”NOTE”

18

| USB Type-C to Type-C cable|

1

| See”NOTE”

19

| USB Type-C to Type-A cable|

1

| See”NOTE”

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.

Wiring Connectivity Diagram

How to connect and disconnect power cable/connectivity cable

WARNING: To change the power cable/ connectivity cable, switch off the power before unplugging the cable and replugging in the required cable.

Connecting the HDMI cable (optional)

Connecting the DisplayPort (DisplayPort to DisplayPort) cable

**Connecting the USB Type-C cable (C to C)**

The USB Type-C port on your monitor:

• Can be used as USB Type-C or DisplayPort 1.4, alternatively.
• Supports USB Power Delivery (PD), with profiles up to 90 W.

Connecting the USB Type-C cable (C to A)

Connecting the RJ45 cable (optional)

Disassembly Procedure

S1| | 1. Remove Rear Cover Screw
Remove screws “1~4” on the rear cover with an electric screwdriver. Torque: 12.0 ± 0.5Kgf/cm
---|---|---
S2| | 2. Remove Rear Cover 1:
Panel side down, remove the rear cover with both hands in a sequence of “1->2->3”, then “1->4->5->6”
S3| | 3. Remove Rear Cover 2:
a. Set up rear cover, remove mylar “1”
b. Remove keypad cable “2”
c. Remove light bar “3”
S4| | 4. Remove Keypad:
a. Remove the keypad cable in a sequence of “1, 2, 3”
b. Remove screws “5, 6” with an electric screwdriver. Screwdriver torque: 2.5 ± 0.5 Kgf/cm
c. Separate keypad and rear cover
S5| | 5. Remove Light Bar and USB Cable:
a. Remove acetate tape “1”, grasp on the pin, then remove the light bar cable horizontally
b. Remove aluminum foil “2”, lift up the USB pin cover, then remove the USB cable
S6| | 6. Remove Chassis and USB Board Screws：
a. Remove chassis screws “1~4” and USB board screws “5” with an electric screwdriver. Torque: 3.5 ± 0.5Kgf/cm
b. Remove USB board
S7| | 7. Remove FFC:
a. Remove aluminum foil “1”
b. Lift up the FFC cover, grasp on a pinch, then remove the light bar cable horizontally
S8| | 8. Remove PCBA 1:
a. Remove mylar
b. Remove screws “1~9” with an electric screwdriver. Torque: 5.5 ± 0.5Kgf/cm
S9| | 9. Remove PCBA 2:
a. Remove Power Board and IF Board
b. Sperate Power Board and IF Board
S10| | 10. Remove Front Trim Screws 1:
a. Remove screws “1~11” on mid-frame with an electric screwdriver. Screwdriver torque: 3.5 ± 0.5 Kgf/cm
b. Separate the mid-frame from the panel
S11| | 11. Remove Front Trim Screws 2:
a. Remove screws “1~3” with an electric screwdriver. Screwdriver torque: 0.8 ± 0.1
Kgf/cm
b. Separate front trim from mid-frame
S12| | 12. Remove LED
a. Remove LED from mid-frame with a jig.
b. Separate lens from LED Board
S13| | Remove electrolyte capacitor >25mm height (red mark) from printed circuit boards.
Cut the glue between the bulk cap and PCBA with a knife to ensure the cutting path within the glue, don’t touch the bulk cap and PCBA.
S14| | Take out the capacitor pin and solder with a soldering iron.
Lift the bulk capacitor away from the power board.

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 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.

4. This message also appears during normal system operation, if the video cable becomes 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.

Our monitor has a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent problem with your monitor, or with your computer and video card.

To run the built-in diagnostics:

To run the built-in diagnostics:

1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. When there is no video input, press and hold in Up or Down or Left or Right direction will be able to access the Main Menu.
3. Use up or down direction to select the Self-Diagnostic function in the Main Menu > Others and confirm with the center key. A gray test pattern appears at the beginning of the diagnostic program.
4. Carefully inspect the screen for abnormalities.
5. Select the Up or Down or Left or Right key to change the test patterns.
6. Repeat steps 4 and 5 to inspect red, green, blue, black, white, and text screens.
7. When in the White color test screen, check for white color uniformity and if their white color appears greenish/reddish, etc.
8. Press the Up or Down or Left or Right key to end the diagnostic program.

Common problems

The following table provides general information about common monitor problems you might encounter and the possible solutions:

the monitor and the computer is properly connected and secure.
•Verify that the power outlet is functioning properly using any other electrical equipment.
•Ensure that the power button is pressed fully.
•Ensure that the correct input source is selected in the Input Source menu.
No video/ Power LED on| No picture or no brightness| •Increase brightness & contrast controls via OSD
•Perform monitor self-test feature check.
•Check for bent or broken pins in the video cable connector.
•Run the built-in diagnostics.
•Ensure that the correct input source is selected in the Input Source menu.
No video/ at HDMI/ DisplayPort/ USB-C port| When connected to some dongle/ docking device at the port. there is no video when
unplugging/plugging the Thunderbolt cable from the notebook| •Unplug the HDMI/DisplayPort/USB-C cable from the dongle/docking device, then plug the docking Thunderbolt cable into the notebook. Plug the HDMI/DisplayPort/USB-C cable 7 seconds later.
Missing pixels| The LCD screen has spots| •Cycle power On-Off.
•Pixel that is permanently Off is a natural defect that can occur in LCD technology.
•For more information about Dell Monitor Quality and Pixel Policy, see the Dell support site at: http://www.dell.com/pixelguidelines.
Common symptoms| What you experience| Possible solutions
---|---|---
Stuck-on pixels| The LCD screen has bright spots| •Cycle power On-Oft
•Pixel that is permanently off is a natural defect that can occur in LCD technology.
•For more information about Dell Monitor Quality and Pixel Policy, see the Dell Support site at: http://www.dell.com/pixelguidelines.
Brightness problems| Picture too dim or too bright| •Reset the monitor to factory settings.
•Adjust brightness & contrast controls via OSD.
Synchronization problems| The screen is scrambled or appears torn| •Reset the monitor to factory settings.
•Perform monitor self-test feature check to determine if the scrambled screen appears in self-test mode.
•Check for bent or broken pins in the video cable connector.
•Restart the computer in safe mode.
Safety-related issues| Visible signs of smoke or sparks| •Do not perform any troubleshooting steps. . Contact Dell immediately.
Intermittent problems| Monitor malfunctions on & off| •Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
•Reset the monitor to factory settings.
•Perform monitor self-test feature check to determine if the intermittent problem occurs in self-test mode.
Missing color| Picture missing color| •Perform monitor self-test feature check.
•Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
•Check for bent or broken pins in the video cable connector.
Wrong color| The picture color is not good| •Change the settings of the Preset Modes in the
Color menu OSD depending on the application.
•Adjust the R/G/B value under Custom Color in the Color menu OSD.
•Run the built-in diagnostics.
Common symptoms| What you experience| Possible solutions
---|---|---
Image retention from a static
image left on the monitor for
a long period of time| Faint shadow from the static image
displayed appears on the screen| •Set the screen to turn off after a few minutes of screen idle time. These can be adjusted in
Windows Power Options or Mac Energy Saver setting.
•Alternatively, use a dynamically changing screensaver.

Product Specific problems

Display menu OSD.
•Reset the monitor to factory settings.
Cannot adjust the monitor with the Joystick on the back panel| OSD does not appear on the screen| •Turn Off the monitor, unplug the power cable, plug it back, and then turn On the monitor.
•The OSD menu may be locked. Press and hold in Up or Down or Left or Right direction for 4 secs to unlock.
No Input Signal when user controls are pressed| No picture, the LED light is white| •Check the signal source. Ensure that the computer is not in the power saving mode by moving the mouse or pressing any key on the keyboard.
•Check whether the signal cable is plugged in properly. Re-plug the signal cable if necessary.
•Reset the computer or video player.
The picture does not fill the entire screen| The picture cannot fill the height or width of the screen| •Due to different video formats (aspect ratio) of DVDs, the monitor may display in full screen.
•Run the built-in diagnostics.
No image when using a USB-C connection to a computer, laptop, and so on| Black screen| •Verify if the USB-C interface of the device can support DP alternate mode.
•Verify if the device required more than 90 W power charging.
•USB-C interface of device cannot support DP alternate mode.
•Set Windows to Projection mode.
•Ensure that the USB-C cable is not damaged.
Common Symptoms| What you experience| Possible Solutions
---|---|---
No charging when using a USB-C connection to a computer, laptop, and so on| No charging| •Verify if the device can support one of
5 V/9 V/15 V/20 V charging profiles.
•Verify if the Notebook requires a > 90 W power adapter.
•If the Notebook requires a > 90 W power adapter, it may not charge with the USB-C connection.
•Ensure that you use only Dell approved adapter or the adapter that comes with the product.
•Ensure that the USB-C cable is not damaged.
Intermittent charging when using a USB-C connection to a computer, laptop, and so on| Intermittent charging| •Check if the maximum power consumption of the device is over 90 W.
•Ensure that you use only Dell approved adapter or the adapter that comes with the product.
•Ensure that the USB-C cable is not damaged.
No image when using DP connection to the PC.| Black screen| •Verify which DP standard (DP 1.1a or DP 1.2 or DP 1A) is your Graphics Card certified to. Download and install the latest graphics card driver.
•Some DP 1.1a graphics cards cannot support DP 1.4 monitors. Go to the OSD menu, under Input Source selection, press and hold DP select ****key for 8 secs to change the monitor setting from DP 1A to DP 1.1a.

Universal Serial Bus (USB) specific problems

your monitor is turned On.
•Reconnect the upstream cable to your computer.
•Reconnect the USB peripherals (downstream connector).
•Switch Off and then turn On the monitor again.
•Reboot the computer.
•Some USB devices like external portable HDD require higher electric current; connect the device directly to the computer system.
SuperSpeed USB 5Gbps (USB 3.2 Gen1) interface is slow| USB 3.2 Gent (5Gbps) peripherals working slowly or not working at all| •Check that your computer is USB 3.2 Gen1 (5Gbps)-capable.
. Some computers have USB 3.2 Gen1 (5Gbps), USB 2.0, and USB 1.1 ports. Ensure that the correct USB port is used.
•Reconnect the upstream cable to your computer.
•Reconnect the USB peripherals (downstream connector).
•Reboot the computer.
Wireless USB peripherals stop working when a
USB 3.2 Gent (5Gbps) device is plugged in| Wireless USB peripherals respond slowly or only work as the distance between themselves and its receiver decreases| •Increase the distance between the USB 3.2 Gent (5Gbps) peripherals and the wireless USB receiver.
•Position your wireless USB receiver as close
as possible to the wireless USB peripherals.
•Use a USB-extender cable to position the wireless USB receiver as far away as possible from the USB 3.2 Gen1 (5Gbps) port.

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