DELL U2723QE UltraSharp 27 4K USB-C Hub Monitor Owner’s Manual

Service Manual – U2723QE/U3023E/U3223QE
Version: 01
Date: 2021/11/30

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. 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 to 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 in 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 of PWBA, not the 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 is requested at the degree of 220°C.

Exploded view diagram with a list of items

other regions
2| ASSY Middle Frame| 1
3| PCBA USB BD| 1
4| PCBA Power BD| 1
5| PCBA Interface BD| 1
6| ASSY Main Chassis| 1
7| ASSY Rear Cover| 1
8| ASSY Stand Base| 1
9| Power cable| 1| See “NOTE”
10| DisplayPort 1.8 M cable| 1| See “NOTE”
11| USB-C Gen2 PD3.0 cable (U3023E only)| 1| See “NOTE”
12| USB-C Gen2 1.0 M cable (A to C) (U3023E only)| 1| See “NOTE”
13| USB-C 1.0 M cable (A to C) (U2723QE/U3223QE only)| 1| See “NOTE”
14| USB-C 1.0 M cable (C to C) (U2723QE/U3223QE only)| 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.

U2723QE &U3223QE

U3023E

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 DP Cable

Connecting the monitor for DP Multi-Stream Transport (MST) function

Connecting the USB-C Cable (A to C)

Connecting the USB-C Cable (C to C)

Connecting the Monitor for USB-C Multi-Stream Transport (MST) Function

Connecting the Monitor for RJ45 Cable (optional)

Disassembly and Assembly Procedures

NOTE:
This “Disassembly and Assembly Procedures” is for EMEA only, not for other regions. Please note that Dell will deem the warranty void if any disassembly is done on the monitors.
Tool Required:
List the type and size of the tools that would typically be used to disassemble the product to a point where components and materials requiring selective treatment can be removed.
Tool Description:
– Screwdriver(Phillip’s head) #1
– Screwdriver(Phillip head) #2
– Penknife
– Soldering iron and absorber

4.1 Disassembly Procedures(U3223QE for example):
**S1** 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.

**S2**Use a Philips-head screwdriver to remove 4pcs screws for unlocking mechanisms. Remove DP caps.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
**S3**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, and the other hand to pull up carefully the rear cover in order of arrow preference for unlocking mechanisms of rear cover.
**S4** Lift the rear cover up carefully. Disconnect the joystick key cable from the connector of the interface board, and then remove the rear cover and put it aside for later disassembling.
**S5** Use a Philips- head screwdriver to remove a 2pcs screw for unlocking the key board, then tear off the tapes and release the keyboard.
(No.1~2 screw size=M2x2.4, Torque=0.8~1kgfxcm)
**S6** Tear off 1pcs aluminum foil for unfixing the bracket, then tear off 1pcs acetate tape for uncovering the LVDS connector.
**S7** Use a Philips- head screwdriver to release one screw for unlocking the USB board, and disconnect the two cables, then release the USB board from the hooks of the middle bezel.
(No.1screw size=M3x6, Torque=4±0.5kgfxcm)
**S8** Use a Philips-head screwdriver to remove 18(13+5)pcs screws for unlocking the middle bezel with the panel module.
(No.1~13 screw size=M3x5, Torque=5±0.5kgfxcm;
No.13~18 screw size=M3x4.5, Torque=5±0.5kgfxcm)
**S9**Disconnect the two-panel lamp cables from the connectors of the panel. Disconnect the LED cable from the connector of the interface board.
**S10.** Use a Philips-head screwdriver to remove 4pcsscrews for unlocking the bracket chassis module with the panel
(No.1~4 Screw size= M3x5, Torque=5±0.5kgfxcm)
**S11** Lift up the middle bezel, and then put it on a cushion foam for later disassembling.
**S12** Tear off the tape on the middle bezel for releasing the LED cable, and then tear off the mylar tape to release the LED board for the hooks of the middle bezel.
**S13** Move up the bracket, then push the earing-lock and disconnect the LVDS cable away from the connectors of the panel module.
**S14** Take away the bracket chassis module and then put the bracket chassis module on a protective cushion.
**S15** Release the panel lamp cables from the hooks of the bracket, then remove the Mylar tape from the hooks of the bracket.
**S16** Use a Philips-head screwdriver to remove screws for the interface board and power board. 8pcs
(No.1 screw size=M4x8, Torque=7±1kgfxcm;
No.2~8 screw size=M3x7.5, Torque=7±1kgfxcm)
**S17** Remove the power board and interface board disconnecting all of the cables. bracket chassis module carefully, and then
5.1 Assembly Procedures:
**S1** Place a bracket chassis base on a protective cushion, then stick 4pcs Silicon sheets on the positions as the picture below shows.
**S2** Take a power board and put the power board into the bracket chassis, settle the cable to the correct position.
**S3** Take an interface board, connect 1pcs LVDS cable and 1pcs panel lamp cable to the connectors of the interface board, then connect the cable of the power board with the interface board. Turn over the interface board and locate it to the bracket. Use a Philips-head screwdriver to tighten 7pcs screws for locking the interface board and power board.
(No.1 screw size=M4x8, Torque=7.5±0.5kgfxcm;
No.2~7 screw size=M4x8, Torque=7.5±0.5kgfxcm)
**S4** Take a black mylar to insert the hooks of the bracket to cover the power board, then tear off the gum paper of the panel lamp cable and locate the cable into the hook of the bracket..
**S5** 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 the inspection criteria of the panel. Turn over the panel module to place the screen faced down for later assembling.
**S6** Move the bracket chassis module close to the panel module, then connect the LVDS cable to the connector of the panel module, then turn over the bracket chassis and put it on the back of the bracket chassis module.
**S7** Adjust the bracket chassis module, and then use a Philips-head screwdriver to tighten 4pcs screws for locking the bracket chassis module with the panel
(No.1~4 Screw size= M3x5, Torque=5±0.5kgfxcm)
**S8** Take 1pcs LED keyboard and 1pcs middle bezel, then put the middle bezel into a fixture jip to fix the middle bezel. Tear off the gum on the back of the board, and then paste the LED board on the correct position of the middle bezel, then paste 1pcs mylar tape to cover the LED board as the picture below shows.
**S9** Move the middle bezel with the LED board close to the panel unit, then assemble the middle bezel with the front bezel and panel module.
**S10** Tear off the release paper of the adhesive tape on the back of the LED cable, then settle and fix the LED cable on the back of the panel module.
**S11**Connect the panel lamp cable to the connector of the panel module. Connect the LED cable to the connector of the interface board.
**S12** 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=5±0.5kgfxcm)
**S13** Take 1pcs USB board, 2pcs cables and 1pcs conductive foam. Connect the 2pcs cables to the connectors of the USB board, then turn over the board and paste the conductive foam on the back of the USB board, and then locate the USB board into the correct position of the middle bezel. Use a Philips-head screwdriver to tighten the 1pcs screw for locking the USB unit with the middle bezel, then connect the two USB cables to the connectors of the interface board.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
S14 Paste 1pcs aluminum foil to fix the bracket on the specific position as the picture below shown.
**S15** Take 1pcs joystick key and 1pcs OSD board, and assemble the joystick key with the OSD board. Locate the board to the correct position of the rear cover, then use a Philips-head screwdriver to tighten 2pcs screws for locking the board with the rear cover. Tear off the tape papers on the back of the cable, and then fix the key cable with tapes.
(No.1~2 screw size=M2x2.4, Torque=0.9±0.1kgfxcm)
**S16** Move the assembled rear cover close to the panel unit, then connect the joystick key cable to the connector of the interface board. Put down the rear cover and push the rear cover on the positions marked in the picture below shown for mechanisms engagement.
**S17** Use a Philips- head screwdriver to tighten 4pcs screws for locking the rear cover with the unit. Stick two pieces of label on the specific positions, then insert 2pcs DP out Caps into the DP out connectors.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
**S18** Take a stand base close to the monitor. Fit the two tabs on the upper part of the stand into the grooves, and then lower the stand so that the monitor mounting area snaps onto the stand.
**S19** Lift up the monitor to check the gap between the front bezel and the panel, then provide a power supply and a video signal to the monitor, then turn on the monitor for a functionality check.

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 digital and analog cables from the back of 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 box 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.

Built-in diagnostics
Your 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:

1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. Select OSD items of Self-Diagnostics in the Others feature.
3. Press the joystick button to start the diagnostics. A gray screen is displayed.
4. Observe if the screen has any defects or abnormalities.
5. Toggle the joystick once again until a red screen is displayed.
6. Observe if the screen has any defects or abnormalities.
7. Repeat steps 5 and 6 until the screen displays green, blue, black, and white colors. Note any abnormalities or defects.

The test is complete when a text screen is displayed. To exit, toggle the joystick control again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool, the monitor is functioning properly. Check the video card and computer.

Common problems
The following table contains 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 depressed fully.
• Ensure that the correct input source is selected in the Input Source menu.
No Video/Power LED on| No Video/Power LED on| • Increase brightness and 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.
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 on Dell Monitor Quality and Pixel Policy, see Dell Support site at: https://www.dell.com/pixelguidelines.
Stuck-on Pixels| LCD screen has bright spots| • Cycle power On-Off.
• Pixel that is permanently off is a natural defect that can occur in LCD technology.
• For more information on Dell Monitor Quality and PixelPolicy, see Dell Support site at: https://www.dell.com/pixelguidelines.
Brightness Problems| Picture too dim or too bright| • Reset the monitor to factory settings.
• Adjust brightness and contrast controls via OSD.
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.
• 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| Picture color not good| • Try different Preset Modes in Color settings OSD.
• Adjust R/G/B value under Custom Color in Color menu OSD.
• Change the Input Color Format to RGB or YCbCr in the Color settings OSD.
• Run the built-in diagnostics.
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 settings.
• Alternatively, use a dynamically changing screensaver.

Product specific problems

Display menu OSD.
• Reset the monitor to factory settings.
Cannot adjust the monitor with the buttons on the front panel| OSD does not appear on the screen| • Turn off the monitor, unplug the monitor power cable, plug it back, and then turn on the monitor.
No Input Signal when user controls are pressed| No picture, the LED light is white| • Check the signal source. Ensure 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. Connect the signal cable again, 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 DP connection to the PC| Black screen| • Verify which DP standard (DP 1.1a or DP 1.4) 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 joystick key for 8 seconds to change the monitor setting from DP 1.4 to DP 1.1a.
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.
---|---|---
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 adaptor.
• If the Notebook requires a >90 W power adaptor, 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 USB-C
connection to computers, laptops, 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 USB-C MST| Black screen or 2nd DUT is not Prime mode| • USB-C input, Go to OSD menu, under Display Info check whether the Link Rate is HBR2 or HBR3, if Link Rate is HBR2, suggest using USB-C to DP cable to turn on MST.
No network connection| The network dropped or Intermittent| • Do not toggle Off/On the power button when the network is connected, keep the power button On.
The LAN port is not functioning| OS setting or cable connection issue| • Ensure that the latest BIOS and drivers for your
computer are installed on your computer.
• Ensure that the RealTek Gigabit Ethernet controller is installed in the Windows Device Manager.
• If your BIOS Setup has a LAN/GBE Enabled/ Disabled option, make sure it is set to Enabled.
• Ensure that the Ethernet cable is connected securely on the monitor and the hub/router/ firewall.
• Check the status LED of the Ethernet cable to confirm connectivity. Re- connect both ends of the Ethernet cable if the LED is not lit.
• First power off the computer and unplug the Type-C cable and power cord of the monitor. Then, power on the computer, plug in the monitor power cord and Type-C cable.
---|---|---
U3023E cannot set to 2560 x 1600 @ 60Hz in Daisy chain mode in DP1.2 (DSC Disable)| 2nd monitor displayed image cannot set at
2560 x 1600 @ 60Hz when set MST On and USB-C Prioritization (High Data Speed)| • Switch USB-C Prioritization from High Data Speed to High Resolution. (USB speed reduce to 2.0)
• Switch PC that supported DP1.4
U3023E connected as 3rd monitor cannot set to 2560 x 1600 @ 60Hz in Daisy chain mode in DP1.4 (DSC Disable)| 3rd monitor displayed image cannot set at 2560 x 1600 @ 60Hz when set MST On and USB-C Prioritization (High Data Speed)| • Switch USB-C Prioritization from High Data Speed to High Resolution. (USB speed reduce to 2.0)
U3023E connected as 3rd monitors displayed
image at lower resolution in DP1.4 (DSC Enable)| Three U3023E monitors are connected in a daisy chain, 3rd
displayed image at a lower resolution when set MST On and USB-C Prioritization (High Data Speed)| • Press the “Windows” + “P” key, and select “second screen only”
• Goto Display setting, select 2560 x 1600
---|---|---
2nd monitor (U3023E) no display an image when 1st monitor (non-DSC) connected
to Discrete Graphic Card (E.g Nvidia) with DSC Enable| Two monitors connected in Daisy chain, 2nd monitor U3023E no displayed image when set MST On and USB-C
Prioritization (High Data Speed)| • Connect U3023E as 1st Monitor
U3023E as 2nd monitor cannot display 2560
x 1600 image when 1st monitor (non-DSC)
connected to Intel Graphic Card with DP1.4
(DSC Enable)| Two monitors are connected in a daisy chain,2nd monitor U3023E cannot display 2560 x 1600 image when setting MST On and USB-C Prioritization (High Data Speed)| • Connect U3023E as 1st Monitor
OSD lagging when navigating the menu| 2 or 3 monitors connected in a daisy chain when MMS is On, OSD lagging during menu navigation| • Set Multi-Monitor Sync (MMS) turn off
• Or Slow the OSD navigating speed to 1 second
---|---|---
OSD no response| 2 or 3 monitors are connected in a daisy chain when MMS is
On, no OSD response during menu navigation response during menu navigation| • Set Multi-Monitor Sync (MMS) turn off
Can’t adjust Brightness/ Contrast through
Dell Display Manager (DDM)| 2 or 3 monitors are connected in a daisy chain when MMS is On, some functions of the 2nd or 3rd monitors may not work on DDM| • Set Multi-Monitor Sync (MMS) turn off
• Or adjust Brightness/contrast through OSD
U3023E as 2nd monitor no displayed image when 1st monitor with USB-C cable connected to Nvidia Graphic Card (DSC Enable) with Salomon docking| Two monitors are connected in the Daisy chain, 2nd monitor
U3023E no displayed image when setting MST On and USB-C
Prioritization (High Data Speed)| • In the BIOS menu set to disable” discrete graphics controller direct output mode”
• Without docking
U3023E connected as 2nd monitor cannot set to 2560 x 1600 @60Hz in Daisy chain mode in DP1.4 (DSC Disable)| Two monitors connected in the Daisy chain, 1st monitor(non-DSC) and 2nd monitor U3023E cannot
set to 2560 x 1600 @ 60Hz when set MST On and USB-C
Prioritization (High Resolution)| • Connect U3023E as 1st Monitor
---|---|---
3x U3023E connected in MST mode encountered a flicker issue| 3x U3023E connected in MST mode encountered a flicker issue for 1 second during Shutdown, Reboot, Unplug/plug,
Sleep & Wakeup| • Intel Graphic card driver limitation
1st monitor (Non-DSC) connected 2nd monitor U3023E (DSC) cannot reach a native resolution for 2nd monitor| 1st monitor (Non-DSC) connected 2nd monitor U3023E (DSC) cannot reach a native resolution for 2nd monitor| • Intel Graphic card driver limitation
• Connect U3023E as 1st Monitor
Ethernet not working| Ethernet not connected| • Install Ethernet Driver 10.45.20.
3 Soundbar unit not working when connected
to 3 U3023E monitor| 3 soundbars unit connected individually to 3 U3023E
monitor, soundbar not working via DP/ HDMI|
---|---|---
3x U3023E connected in MST mode  DSCdisable and High Data Speed encountered hang five minutes issue| Three monitors are connected in the Daisy chain, 1st monitor
connect USB-C cable with platform and 2nd and 3 rd
monitor with DP cable when setting MST On and USB-C Prioritization (High Data Speed) and DSC Disable Restart
platform or unplug and plug USB-C cable encounter hang
five minutes issue| • Connect 2 U3023E monitor at DSC disable and USB-C Prioritization switch to High Data Speed,
Or
• Connect 3 U3023E monitor at DSC disable and USB-C Prioritization switch to High Resolution

Universal Serial Bus (USB) specific problems

that your display is turned ON.
• Reconnect the upstream cable to your computer.
• Reconnect the USB peripherals (downstream connector).
• Turn off the monitor and turn it on again.
• Reboot the computer.
• Certain USB devices such as portable hard drives require higher power sources; connect the drive to the computer directly.
Super speed USB 3.2 Gen2
the interface is slow.| Super speed USB 3.2 Gen2 peripherals
working slowly or not working at all| • Check that your computer is USB 3.0-capable.
• Some computers have USB 3.0, 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 3.0 device
is plugged in| Wireless USB peripherals responding
slowly or only working as the distance
between itself and its receiver decreases| • Increase the distance between the USB 3.0 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 3.0 port.
USB is not working| No USB functionalities| Refer to input source and USB pairing table.

References

• Computers and Electronics for Home | Dell USA

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