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

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:

Product specific problems

Universal Serial Bus (USB) specific problems