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Dell UltraSharp U2725QE Simplified Service Manual
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Dell UltraSharp U2725QE Simplified Service Manual

Dell UltraSharp U2725QE Simplified Service Manual

27 4k thunderbolt hub monitor
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Dell UltraSharp 27 4K Thunderbolt Hub Monitor
U2725QE
Simplified Service Manual
Model: U2725QE
Regulatory Model: U2725QEt
February 2025
Rev. A00

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Summary of Contents for Dell UltraSharp U2725QE

  • Page 1 Dell UltraSharp 27 4K Thunderbolt Hub Monitor U2725QE Simplified Service Manual Model: U2725QE Regulatory Model: U2725QEt February 2025 Rev. A00...

  • Page 2: Notes, Cautions, And Warnings

    A WARNING indicates a potential for property damage, personal injury, or death. Copyright © 2025 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

  • Page 3: Table Of Contents

    Contents Safety instructions ..............5 Before working inside your monitor .
  • Page 4 Contacting Dell ........

  • Page 5: Safety Instructions

    Safety instructions Use the following safety guidelines to protect your monitor from potential damage and to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that you have read the safety information that shipped with your monitor.

  • Page 6: View Of U2725Qe Monitor

    View of U2725QE Monitor Front view Figure 1. Front view of the monitor Table 1. Components and descriptions. Label Description Function Power LED indicator Solid white light indicates the monitor is turned on and functioning normally. Blinking white light indicates the monitor is in Standby Mode. 2 x USB-C 10Gbps downstream Connect your USB device.

  • Page 7: Top View

    Top view Figure 2. Top view of the monitor Table 2. Components and descriptions. Label Description Function Ambient light sensor Detects ambient light and adjusts the brightness of the display accordingly. For more information, see Auto Brightness and Auto Color Temp. NOTE: If the Ambient light sensor detects abnormal change in the light level, see Ambient light detection anomaly.

  • Page 8: Back View

    Joystick Use it to control the OSD menu. Regulatory label (including Refer to this label if you need to contact Dell for technical support. The Service Tag is a unique alphanumeric identifier that enables Dell service technicians Mac address, Barcode,...

  • Page 9: Bottom View

    Bottom view Figure 4. Bottom view of the monitor Table 4. Components and descriptions. Label Description Function Security lock slot Secures monitor with security cable lock (sold separately). Connect the power cable. Power connector Connect your computer with the HDMI cable. HDMI 2.1 port Connect your computer with the DisplayPort cable.
  • Page 10 Maximum resolution of 3840 x 2160 at 120 Hz. Power Delivery up to 140 W This model will feature Thunderbolt 4 technology and will have a 140 W power delivery, it is recommended for use the following Dell’s products that meet the fire enclosures. NOTE: Thunderbolt 4 upstream is not supported on Windows versions that are prior to Windows 10.

  • Page 11: Major Components Of U2725Qe Monitor

    Major components of U2725QE monitor The following image shows the major components of U2725QE. Figure 5. Major components of the U2725QE monitor...
  • Page 12 LED board Display panel NOTE: For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell: 1. Go to 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.

  • Page 13: Wiring Connectivity Diagram

    Never pull on the cord. NOTE: Dell monitors are designed to work optimally with the Dell-supplied cables inside the box. Dell does not guarantee the video quality and performance if non-Dell cables are used.
  • Page 14 Cable tie or Cord Figure 7. Prevent the monitor from falling 3. Turn on your monitor. 4. Select the correct input source from the OSD Menu on your monitor and then turn on your computer. NOTE: U2725QE default setting is DisplayPort 1.4. A DisplayPort 1.1 Graphic card may not display normally. NOTE: Remove the rubber plug when using DisplayPort (out) or Thunderbolt 4 downstream or USB-C upstream connector.
  • Page 15 Connecting the DispalyPort cable Figure 9. Connecting the DispalyPort cable Connecting the monitor for DP Multi-Stream Transport (MST) function Figure 10. Connecting the monitor for DP Multi-Stream Transport (MST) function Figure 11. Connecting the monitor for DP-TBT Multi-Stream Transport (MST) function NOTE: Supports the DisplayPort MST feature.
  • Page 16 Connecting the Thunderbolt 4 cable Figure 12. Connecting the Thunderbolt 4 cable Connecting the Monitor for Thunderbolt 4 daisy chain function Figure 13. Connecting the Monitor for Thunderbolt 4 daisy chain function-1 Figure 14. Connecting the Monitor for TBT-DP daisy chain function Figure 15.
  • Page 17 WARNING:The Dell UltraSharp U2725QE supports the USB-C Power Delivery 3.1 (Thunderbolt 4) specification and can provide a maximum output of up to 140 W. For safety consideration, this USB-C port must be connected to the Dell-approved products with the inbox Thunderbolt 4 Passive cable. For the list of Dell-approved products, refer Dell products compatible with USB-C Power Delivery 3.1 (Extended Power Range 140 W) Tech sheet at Dell.com/support/U2725QE.

  • Page 18: Disassembly And Reassembly

    Disassembly and reassembly CAUTION: The information in this section is intended for authorized service technicians in the EMEA region. Dell prohibits users from disassembling the monitor, and any damage caused by unauthorized servicing will not be covered under the warranty.

  • Page 19: Stand

    Stand Removing the stand Prerequisites 1. Follow the procedure in Before working inside your monitor. Steps 1. Place the monitor on a soft cloth or cushion. 2. Press and hold the stand-release button. 3. Tilt the stand upwards till the stand is separated from the monitor head. 4.

  • Page 20: Installing The Stand

    Installing the stand Steps 1. Align and place the stand riser on the stand base. 2. Open the screw handle at the bottom of the stand base and turn it clockwise to secure the stand assembly. 3. Close the screw handle. 4.

  • Page 21: Upper Back Cover

    Upper back cover Removing the upper back cover Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. Steps 1. Remove the four screws (M4x10) to release the upper back cover. 2. Use one hand to push the upper back cover from the bottom side to the top side. 3.

  • Page 22: Installing The Upper Back Cover

    Installing the upper back cover Steps 1. Connect the keypad cable to the main board. 2. Slide the upper back cover to the slots of the middle frame from the top side to bottom side, and push along the side to snap the upper back cover into place.

  • Page 23: Keypad Board

    Keypad board Removing the keypad board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. Steps 1. Peel the keypad cable from the back cover. 2. Peel the foam from the keypad board. 3.

  • Page 24: Installing The Keypad Board

    Installing the keypad board Steps 1. Install the joystick cap on the keypad board. 2. Locate the keypad board to the upper back cover. 3. Replace the two screws (M2x3.3) that secure the keypad board to the upper back cover. 4.

  • Page 25: Lower Back Cover

    Lower back cover Removing the lower back cover Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. Steps 1. Pry the lower back cover from the display-assembly base starting from the left side or right side. 2.

  • Page 26: Installing The Lower Back Cover

    Installing the lower back cover Steps 1. Slide the lower back cover into the slots on the display-assembly base, and press along the side to snap the lower back cover into place. Figure 26. Installing the lower back cover Next steps 1.

  • Page 27: I/O Cover

    I/O Cover Removing the I/O cover Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover. Steps 1. Remove the four screws (M3x5) that secure the I/O cover to the main chassis. 2.

  • Page 28: Installing The I/O Cover

    Installing the I/O Cover Steps 1. Place the I/O cover on the main chassis. 2. Align the screw holes on the I/O cover with the screw holes on the main chassis. 3. Replace the four screws (M3x5) that secure the I/O cover to the main chassis. Figure 28.

  • Page 29: Qap (Quickly Accessary Ports)

    QAP (Quickly Accessary Ports) Removing the QAP Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover. 6. Remove the cover.

  • Page 30: Installing The Qap

    Installing the QAP Steps 1. Align the screw holes on the QAP with the screw holes on the middle frame. 2. Replace the four screws (M3x6) that secure the QAP to the middle frame. 3. Connect the two wires to the main board and close the lock. 4.

  • Page 31: Usb Board

    USB Board Removing the USB board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover. 6. Remove the cover.

  • Page 32: Installing The Usb Board

    Installing the USB board Steps 1. Connect the two USB wires to the USB board and lock it. 2. Adhere the two conductive tape on the back of the USB board. 3. Assemble the USB board and iron cover with the bottom cover of the QAP. 4.

  • Page 33: Main Chassis

    Main chassis Removing the main chassis Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover. 6. Remove the cover.

  • Page 34: Installing The Main Chassis

    Installing the main chassis Steps 1. Align the holes on the main chassis with the probers the middle frame. 2. Connect the eDP cable and lightbar cables to the connector on the display panel and main board. 3. Connect the LED cable and sensor cable to the main board. 4.

  • Page 35: Middle Frame

    Middle frame Removing the middle frame Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover. 6. Remove the cover.

  • Page 36: Installing The Middle Frame

    Installing the middle frame Steps 1. Align and place the middle frame on the display panel. 2. Adhere the sensor cable on the back of display panel. 3. Replace the eleven screws (M3x5) and the five screws (M3x4) to secure the middle frame to the display panel. Figure 36.

  • Page 37: Led Board And Als Board

    LED board and ALS board Removing the LED board and ALS board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover.

  • Page 38: Installing The Led Board And Als Board

    4. Remove the ALS board from the pins on the top side of middle frame. Figure 38. Removing the LED board and ALS board Installing the LED board and ALS board Steps 1. Align the holes on the ALS board with the pins on the middle frame (top side). 2.
  • Page 39 4. Adhere the LED cable on the middle frame with tape. Figure 40. Adhere the LED cable on the middle frame Next steps 1. Install the middle frame. 2. Install the main chassis. 3. Install the board. 4. Install the QAP. 5.

  • Page 40: Main Board And Power Board

    Main board and power board Removing the main board and power board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the upper back cover. 4. Remove the keypad board. 5. Remove the lower back cover.
  • Page 41 3. Remove the six screws (M3x6) and one screw (M4x8) on the main board and power board. 4. Slide the lightbar cable from the slot on the main chassis. 5. Lift the power board and disconnect the switch cable from the main board. Figure 42.
  • Page 42 8. Disconnect the eDP cable, lightbar cable and connective cables from the connectors on the main board. Figure 44. disconnecting the cables from the main board...

  • Page 43: Installing The Main Board And Power Board

    Installing the main board and power board Steps 1. Connect eDP cable, lightbar cable and the connective cables of the power board to the connectors on the main board. Figure 45. Connecting the cables to the main board 2. Replace the AC switch to the main chassis. 3.
  • Page 44 4. Align the screw holes on the boards with the screw holes on the main chassis. 5. Replace the six screws (M3x6) and one screw (M4x8) that secure the main board and power board to the main chassis. Figure 47. Installing the main board and power board 6.
  • Page 45 4. Install the board. 5. Install the QAP. 6. Install the cover. 7. Install the lower back cover. 8. Install the keypad board. 9. Install the upper back cover. 10. Install the stand. 11. Follow the procedure in After working inside your monitor.

  • Page 46: Troubleshooting

    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. No DP Cable The display will go into Standby mode in 4 minutes. www.dell.com/support/U2725QE Figure 49. Warning message-no DP cable No HDMI Cable The display will go into Standby mode in 4 minutes.

  • Page 47: 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. Dell UltraSharp 32 4K Thunderbolt Hub Monitor - U2725QE Brightness/Contrast...

  • Page 48: Common Problems

    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 www.dell. com/pixelguidelines Stuck-on pixels LCD screen has bright •...

  • Page 49: Product-Specific Problems

    If the Notebook requires a >140 W power adaptor, it may not charge with the Thunderbolt 4 connection. • Ensure that you use only Dell approved adapter or the adapter that comes with the product. • Ensure that the Thunderbolt 4 cable is not damaged.

  • Page 50: Universal Serial Bus (Usb) Specific Problems

    Specific symptoms What you experience Possible solutions The LAN port is not OS setting or cable • Ensure that the latest BIOS and drivers for your computer are installed on functioning connection issue your computer. • Ensure that the RealTek 2.5 G Ethernet Controller is installed in the Windows Device Manager.

  • Page 51: Contacting Dell

    Contacting Dell To contact Dell for sales, technical support, or customer service issues, see www.dell.com/contactdell. NOTE: Availability varies by country and product, and some services may not be available in your country. NOTE: If you do not have an active internet connection, you can find contact information on your purchase invoice, packing slip,...