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Dell Pro 27 Plus P2725D Service Manual
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Dell Pro 27 Plus P2725D Service Manual

Dell Pro 27 Plus P2725D Service Manual

Qhd monitor, qhd usb-c hub monitor, 4k usb-c hub monitor
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Dell Pro 27 Plus QHD Monitor
P2725D
Dell Pro 27 Plus QHD USB-C Hub Monitor
P2725DE
Dell Pro 27 Plus 4K USB-C Hub Monitor
P2725QE
Service Manual
Model: P2725D/P2725DE/P2725QE
Regulatory Model: P2725Df/P2725DEf/P2725QEf
March 2025
Rev. A00
Regulatory
1

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Summary of Contents for Dell Pro 27 Plus P2725D

  • Page 1 Dell Pro 27 Plus QHD Monitor P2725D Dell Pro 27 Plus QHD USB-C Hub Monitor P2725DE Dell Pro 27 Plus 4K USB-C Hub Monitor P2725QE Service Manual Model: P2725D/P2725DE/P2725QE Regulatory Model: P2725Df/P2725DEf/P2725QEf March 2025 Regulatory Rev. A00...

  • Page 2: Notes, Cautions, And Warnings

    A WARNING indicates a potential for property damage, personal injury, or death. © 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 Chapter 1: Safety Instructions ............................6 Before working inside your monitor ..........................7 After working inside your monitor ..........................7 Chapter 2: Views of P2725 monitor ..........................8 Side view ..................................... 8 Front view ................................... 9 Bottom view ..................................10 P2725D ..................................
  • Page 4 Removing the interface board ..........................42 Installing the interface board ..........................45 Power board ..................................48 Removing the power board ............................. 48 Installing the power board ............................49 LED board ..................................50 Removing the LED board ............................50 Installing the LED board ............................52 Chapter 7: Disassembly and reassembly- P2725DE ....................
  • Page 5 Installing the LED board ............................116 Chapter 9: Troubleshooting Instructions ........................119 Self-test ................................... 119 Built-in diagnostics................................ 120 Common problems ............................... 121 Product-specific problems ............................123 Universal Serial Bus (USB) specific problems ......................125 Chapter 10: Contacting Dell ............................126 Contents 5...

  • Page 6: Chapter 1: 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 was shipped with your monitor.

  • Page 7: Before Working Inside Your Monitor

    Before working inside your monitor Steps Save and close all open files and exit all open applications. Turn off your monitor. Disconnect your monitor and all attached devices from their electrical outlets. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and dock from your monitor. CAUTION: To disconnect a network cable, first unplug the cable from your monitor and then unplug the cable from the network device.

  • Page 8: Chapter 2: Views Of P2725 Monitor

    Views of P2725 monitor Side view Figure 1. Side view of the monitor 8 Views of P2725 monitor...

  • Page 9: Front View

    Front view Figure 2. Front view of the monitor Display panel Provides visual output to the user. USB-C 5Gbps downstream port (Data only) Connect your USB 5Gbps device. USB 5Gbps Type-A downstream port Connect your USB 5Gbps device. Views of P2725 monitor 9...

  • Page 10: Bottom View

    Bottom view P2725D Figure 3. Bottom view of the monitor Power connector Connect the power cable (shipped with your monitor). HDMI port Connect your computer with the HDMI cable. DisplayPort Connect your computer with the DisplayPort cable. USB 5Gbps Type-B upstream port Connect the USB cable that came with your monitor to the computer.

  • Page 11: P2725De

    P2725DE Figure 4. Bottom view of the monitor Power connector Connect the power cable (shipped with your monitor). HDMI port Connect your computer with the HDMI cable. DisplayPort (in) Connect your computer with the DisplayPort cable. DisplayPort (out) DisplayPort output for MST (multi-stream transport) capable monitor. NOTE: Remove the rubber plug when using DisplayPort out connector.

  • Page 12: P2725Qe

    P2725QE Figure 5. Bottom view of the monitor Power connector Connect the power cable (shipped with your monitor). HDMI port Connect your computer with the HDMI cable. DisplayPort Connect your computer with the DisplayPort cable. USB-C Connect to your computer using the USB-C to C cable. The alternate mode with DP 1.4 support the maximum resolution of 3840 X 2160 at 100 Hz, PD 20 V/4.5 A, 15 V/3 A, 9 V/3 A, 5 V/3 A.

  • Page 13: Chapter 3: Major Components Of Your Monitor

    Major components of your monitor P2725D Figure 6. Major components Table 1. Components. Item Description Item Description Stand riser Power board Stand base Display middle-frame Back cover LED board Joystick Display panel Keypad board Quick Access Port (QAP) back cover Chassis QAP board Interface board...

  • Page 14: P2725De

    P2725DE Figure 7. Major components Table 2. Components. Item Description Item Description Stand riser Power board Stand base Display middle-frame Back cover LED board Joystick Display panel Keypad board Quick Access Port (QAP) back cover Chassis QAP board Interface board QAP module 14 Major components of your monitor...

  • Page 15: P2725Qe

    P2725QE Figure 8. Major components Table 3. Components. Item Description Item Description Stand riser Power board Stand base Display middle-frame Back cover LED board Joystick Display panel Keypad board Quick Access Port (QAP) back cover Chassis QAP board Interface board QAP module Major components of your monitor 15...

  • Page 16: Chapter 4: Wiring Connectivity Diagram

    Wiring connectivity diagram Figure 9. Wiring connectivity diagram 16 Wiring connectivity diagram...
  • Page 17 Table 4. Cables. Item Description LVDS cable Lightbar cable LED cable QAP cable Keypad cable Wiring connectivity diagram 17...

  • Page 18: Chapter 5: Connecting The Cables

    Do not connect all cables to the computer simultaneously. It is recommended to route the cables through the cable- management slot before you connect them to the monitor. NOTE: Dell monitors are designed to work optimally with Dell-supplied inbox cables. Dell does not guarantee the video quality and performance if non-Dell cables are used. NOTE: Route the cables through the cable-management slot before connecting them.

  • Page 19: Connecting Displayport (Displayport To Displayport) Cable

    Connecting DisplayPort (DisplayPort to DisplayPort) cable Figure 11. Connecting DisplayPort cable Connecting DisplayPort and USB cable P2725D Figure 12. Connecting DisplayPort and USB cable Connecting the cables 19...

  • Page 20: Connecting Usb-C To C Cable

    Connecting USB-C to C cable P2725DE/P2725QE Figure 13. Connecting USB-C to C cable Connecting USB Type-C to Type-A cable P2725DE/P2725QE Figure 14. Connecting USB Type-C to Type-A cable 20 Connecting the cables...

  • Page 21: Connecting The Rj45 Cable (Optional)

    Connecting the RJ45 cable (optional) P2725DE/P2725QE Figure 15. Connecting the RJ45 cable Connecting the monitor for the DP Multi-Stream Transport (MST) function P2725DE Figure 16. Connecting the monitor for the DP MST function NOTE: This monitor supports the DP MST feature. To use this feature, your PC Graphics Card must be certified to DP1.4 with MST option.

  • Page 22: Connecting The Monitor For The Usb-C Multi-Stream Transport (Mst) Function

    Connecting the monitor for the USB-C Multi-Stream Transport (MST) function P2725DE Figure 17. Connecting the monitor for USB-C MST function NOTE: The maximum number of supported monitors using MST is subjected to the bandwidth of the USB-C source. NOTE: Remove the rubber plug when using the DisplayPort out connector. 22 Connecting the cables...

  • Page 23: Chapter 6: Disassembly And Reassembly- P2725D

    Disassembly and reassembly- P2725D NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Recommended tools Phillips screwdriver #00  Phillips screwdriver #2  Plastic scribe  Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box.

  • Page 24: Stand

    Stand Removing the stand Prerequisites Follow the procedure in Before working inside your monitor. Steps Press the release button and tilt the stand upwards till the stand is separated from the monitor head. Open the screw handle at the bottom of the stand base, then unscrew the screw anti-clockwise. Remove the stand riser from the stand base.
  • Page 25 Figure 19. Removing the stand Disassembly and reassembly- P2725D 25...

  • Page 26: Installing The Stand

    Installing the stand Steps Align and place the stand riser on the stand base. Open the screw handle at the bottom of the stand, then screw the screw clockwise to secure the stand riser to the stand base. Close the screw handle at the bottom of the stand. Attach the stand to the monitor.
  • Page 27 Figure 21. Installing the stand Next steps Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725D 27...

  • Page 28: Back Cover

    Back cover Removing the back cover Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Steps Remove the four screws (M4x10) that secure the back cover to the chassis assembly. Pry the back cover up, starting from the top edge of the monitor. Lift and hold on the back cover, remove the side mylar from the chassis, disconnect the keypad cable from the connector on the interface board.
  • Page 29 Figure 23. Removing the back cover Disassembly and reassembly- P2725D 29...

  • Page 30: Installing The Back Cover

    Installing the back cover Steps Lift the back cover up above the chassis, connect the keypad cable to the connector on the interface board, attach the side mylar to the chassis. Place and snap the back cover into place on the chassis assembly. NOTE: Align the screw holes on the back cover with the screw holes on the chassis assembly before applying slight pressure to the back cover.
  • Page 31 Figure 25. Installing the back cover Next steps Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725D 31...

  • Page 32: Keypad Board

    Keypad board Removing the keypad board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Steps Remove the two screws (T3x6) that secure the keypad board to the back cover. Peel the keypad cable from the back cover. Remove the keypad board from the back cover.

  • Page 33: Installing The Keypad Board

    Installing the keypad board Steps Align and place the keypad board on the back cover. Replace the two screws (T3x6) to secure the keypad board to the back cover. Adhere the keypad cable to the back cover. Figure 27. Installing the keypad board Next steps Install the back cover.

  • Page 34: Qap Board

    QAP board Removing the QAP board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Steps Disconnect the QAP cable from the connector on the interface board. Remove the QAP module from the display middle-frame. Remove the QAP back cover from the QAP module.
  • Page 35 Figure 29. Removing the QAP board Disassembly and reassembly- P2725D 35...

  • Page 36: Installing The Qap Board

    Installing the QAP board Steps Connect the QAP cable to the connector on the QAP board. Align and place the QAP board onto the QAP module. Replace the two screws (T3x6) to secure the QAP board to the QAP module. Attach the QAP back cover to the QAP module.
  • Page 37 Figure 31. Installing the QAP board Next steps Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725D 37...

  • Page 38: Chassis Assembly

    Chassis assembly Removing the chassis assembly Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Steps Disconnect the LED cable from the connector on the interface board. Peel the tape from the lightbar connector.
  • Page 39 Figure 33. Removing the chassis assembly Disassembly and reassembly- P2725D 39...

  • Page 40: Installing The Chassis Assembly

    Installing the chassis assembly Steps Place the chassis assembly on the display panel. NOTE: Align the cross rib on the display middle-frame to the holes on the chassis assembly. Connect the LVDS cables to the connector on the display panel. Adhere six aluminum foils to the chassis assembly and display panel.
  • Page 41 Figure 35. Installing the chassis assembly Next steps Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725D 41...

  • Page 42: Interface Board

    Interface board Removing the interface board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Steps Remove the mylar that covers the power board. Remove the seven screws (M3x6) that secure the interface board and power board to the chassis assembly.
  • Page 43 Figure 37. Removing the interface board Disassembly and reassembly- P2725D 43...
  • Page 44 Figure 38. Removing the interface board 44 Disassembly and reassembly- P2725D...

  • Page 45: Installing The Interface Board

    Installing the interface board Steps Connect the LVDS cables to the connector on the interface board. Connect the power cable to the connector on the interface board. Align and place the interface board and power board on the chassis assembly. Replace the seven screws (M3x6) to secure the interface board and power board with the chassis assembly.
  • Page 46 Figure 40. Installing the interface board 46 Disassembly and reassembly- P2725D...
  • Page 47 Figure 41. Installing the interface board Next steps Install the chassis assembly. Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725D 47...

  • Page 48: Power Board

    Power board Removing the power board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Remove the interface board. Steps Disconnect the lightbar cable from the connector on the power board. Figure 42.

  • Page 49: Installing The Power Board

    Installing the power board Steps Connect the lightbar cable to the connector on the power board. Figure 43. Installing the power board Next steps Install the interface board. Install the chassis assembly. Install the board. Install the keypad board. Install the back cover.

  • Page 50: Led Board

    LED board Removing the LED board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Remove the interface board. Remove the power board.
  • Page 51 Figure 45. Removing the LED board Disassembly and reassembly- P2725D 51...

  • Page 52: Installing The Led Board

    Installing the LED board Steps Align and place the LED board on the display middle-frame. Replace the screw (T2x3) to secure the LED board to the display middle-frame. Adhere the mylar to cover the LED board. Align and place the display middle-frame on the display panel. Adhere the LED cable to the display panel.
  • Page 53 Figure 47. Installing the LED board Disassembly and reassembly- P2725D 53...
  • Page 54 Next steps Installing the power board. Install the interface board. Install the chassis assembly. Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. 54 Disassembly and reassembly- P2725D...

  • Page 55: Chapter 7: Disassembly And Reassembly- P2725De

    Disassembly and reassembly- P2725DE NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Recommended tools Phillips screwdriver #00  Phillips screwdriver #2  Plastic scribe  Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box.

  • Page 56: Stand

    Stand Removing the stand Prerequisites Follow the procedure in Before working inside your monitor. Steps Press the release button and tilt the stand upwards till the stand is separated from the monitor head. Open the screw handle at the bottom of the stand base, then unscrew the screw anti-clockwise. Remove the stand riser from the stand base.
  • Page 57 Figure 49. Removing the stand Disassembly and reassembly- P2725DE...

  • Page 58: Installing The Stand

    Installing the stand Steps Align and place the stand riser on the stand base. Open the screw handle at the bottom of the stand, then screw the screw clockwise to secure the stand riser to the stand base. Close the screw handle at the bottom of the stand. Attach the stand to the monitor.
  • Page 59 Figure 51. Installing the stand Next steps Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725DE...

  • Page 60: Back Cover

    Back cover Removing the back cover Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Steps Remove the four screws (M4x10) that secure the back cover to the chassis assembly. Pry the back cover up, starting from the top edge of the monitor. Lift and hold on the back cover, remove the side mylar from the chassis, disconnect the keypad cable from the connector on the interface board.
  • Page 61 Figure 53. Removing the back cover Disassembly and reassembly- P2725DE...

  • Page 62: Installing The Back Cover

    Installing the back cover Steps Lift the back cover up above the chassis, connect the keypad cable to the connector on the interface board, attach the side mylar to the chassis. Place and snap the back cover into place on the chassis assembly. NOTE: Align the screw holes on the back cover with the screw holes on the chassis assembly before applying slight pressure to the back cover.
  • Page 63 Figure 55. Installing the back cover Next steps Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725DE...

  • Page 64: Keypad Board

    Keypad board Removing the keypad board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Steps Remove the two screws (T3x6) that secure the keypad board to the back cover. Peel the keypad cable from the back cover. Remove the keypad board from the back cover.

  • Page 65: Installing The Keypad Board

    Installing the keypad board Steps Align and place the keypad board on the back cover. Replace the two screws (T3x6) to secure the keypad board to the back cover. Adhere the keypad cable to the back cover. Figure 57. Installing the keypad board Next steps Install the back...

  • Page 66: Qap Board

    QAP board Removing the QAP board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Steps Disconnect the QAP cable from the connector on the interface board. Remove the QAP module from the display middle-frame. Remove the QAP back cover from the QAP module.
  • Page 67 Figure 59. Removing the QAP board Disassembly and reassembly- P2725DE...

  • Page 68: Installing The Qap Board

    Installing the QAP board Steps Connect the QAP cable to the connector on the QAP board. Align and place the QAP board on the QAP module. Replace the two screws (T3x6) to secure the QAP board to the QAP module. Attach the QAP back cover to the QAP module.
  • Page 69 Figure 61. Installing the QAP board Next steps Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725DE...

  • Page 70: Chassis Assembly

    Chassis assembly Removing the chassis assembly Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Steps Disconnect the LED cable from the connector on the interface board. Peel the tape on the lightbar connector.
  • Page 71 Figure 63. Removing the chassis assembly Disassembly and reassembly- P2725DE...

  • Page 72: Installing The Chassis Assembly

    Installing the chassis assembly Steps Place the chassis assembly on the display panel. NOTE: Align the cross rib on the display middle-frame to the holes on the chassis assembly. Connect the LVDS cables to the connector on the display panel. Adhere four aluminum foils to the chassis assembly and display panel.
  • Page 73 Figure 65. Installing the chassis assembly Next steps Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725DE...

  • Page 74: Interface Board

    Interface board Removing the interface board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Steps Remove the mylar that covers the power board. Remove the eight screws (M3x6) that secure the interface board and power board to the chassis assembly.
  • Page 75 Figure 67. Removing the interface board Disassembly and reassembly- P2725DE...
  • Page 76 Figure 68. Removing the interface board 76 Disassembly and reassembly- P2725DE...

  • Page 77: Installing The Interface Board

    Installing the interface board Steps Connect the LVDS cables to the connector on the interface board. Connect the power cable to the connector on the interface board. Align and place the interface board and power board on the chassis. Replace the eight screws (M3x6) to secure the interface board and power board to the chassis assembly. Replace the screw (M4x9) to secure the power board to the chassis assembly.
  • Page 78 Figure 70. Installing the interface board 78 Disassembly and reassembly- P2725DE...
  • Page 79 Figure 71. Installing the interface board Next steps Install the chassis assembly. Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725DE...

  • Page 80: Power Board

    Power board Removing the power board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Remove the interface board. Steps Disconnect the lightbar cable from the connector on the power board. Figure 72.

  • Page 81: Installing The Power Board

    Installing the power board Steps Connect the lightbar cable to the connector on the power board. Figure 73. Installing the power board Next steps Install the interface board. Install the chassis assembly. Install the board. Install the keypad board. Install the back cover.

  • Page 82: Led Board

    LED board Removing the LED board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Remove the interface board. Remove the power board.
  • Page 83 Figure 75. Removing the LED board Disassembly and reassembly- P2725DE...

  • Page 84: Installing The Led Board

    Installing the LED board Steps Align and place the LED board on the display middle-frame. Replace the screw (T2x3) to secure the LED board to the display middle-frame. Adhere the mylar to cover the LED board. Connect the lightbar cable to the connector on the power board. Align and place the display middle-frame on the display panel.
  • Page 85 Figure 77. Installing the LED board Disassembly and reassembly- P2725DE...
  • Page 86 Next steps Installing the power board. Install the interface board. Install the chassis assembly. Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. 86 Disassembly and reassembly- P2725DE...

  • Page 87: Chapter 8: Disassembly And Reassembly- P2725Qe

    Disassembly and reassembly- P2725QE NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Recommended tools Phillips screwdriver #00  Phillips screwdriver #2  Plastic scribe  Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box.

  • Page 88: Stand

    Stand Removing the stand Prerequisites Follow the procedure in Before working inside your monitor. Steps Press the release button and tilt the stand upwards till the stand is separated from the monitor head. Open the screw handle at the bottom of the stand base, then unscrew the screw anti-clockwise. Remove the stand riser from the stand base.
  • Page 89 Figure 79. Removing the stand Disassembly and reassembly- P2725QE 89...

  • Page 90: Installing The Stand

    Installing the stand Steps Align and place the stand riser on the stand base. Open the screw handle at the bottom of the stand, then screw the screw clockwise to secure the stand riser to the stand base. Close the screw handle at the bottom of the stand. Attach the stand to the monitor.
  • Page 91 Figure 81. Installing the stand Next steps Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725QE 91...

  • Page 92: Back Cover

    Back cover Removing the back cover Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Steps Remove the four screws (M4x10) that secure the back cover to the chassis assembly. Pry the back cover up, starting from the top edge of the monitor. Lift and hold on the back cover, remove the side mylar from the chassis, disconnect the keypad cable from the connector on the interface board.
  • Page 93 Figure 83. Removing the back cover Disassembly and reassembly- P2725QE 93...

  • Page 94: Installing The Back Cover

    Installing the back cover Steps Lift the back cover up above the chassis, connect the keypad cable to the connector on the interface board, attach the side mylar to the chassis. Place and snap the back cover into place on the chassis assembly. NOTE: Align the screw holes on the back cover with the screw holes on the chassis assembly before applying slight pressure to the back cover.
  • Page 95 Figure 85. Installing the back cover Next steps Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725QE 95...

  • Page 96: Keypad Board

    Keypad board Removing the keypad board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Steps Remove the two screws (T3x6) on the keypad board that secure the keypad board to the back cover. Peel the keypad cable from the back cover.

  • Page 97: Installing The Keypad Board

    Installing the keypad board Steps Align and place the keypad board on the back cover. Replace the two screws (T3x6) to secure the keypad board to the back cover. Adhere the keypad cable on the back cover. Figure 87. Installing the keypad board Next steps Install the back cover.

  • Page 98: Qap Board

    QAP board Removing the QAP board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Steps Disconnect the QAP cable from the connector on the interface board. Remove the QAP module from the display middle-frame. Remove the QAP back cover from the QAP module.
  • Page 99 Figure 89. Removing the QAP board Disassembly and reassembly- P2725QE 99...

  • Page 100: Installing The Qap Board

    Installing the QAP board Steps Connect the QAP cable to the connector on the QAP board. Align and place the QAP board on the QAP module. Replace the two screws (T3x6) to secure the QAP board to the QAP module. Attach the QAP back cover to the QAP module.
  • Page 101 Figure 91. Installing the QAP board Next steps Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725QE 101...

  • Page 102: Chassis Assembly

    Chassis assembly Removing the chassis assembly Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Steps Disconnect the LED cable from the connector on the interface board. Peel the tape on the lightbar connector.
  • Page 103 Figure 93. Removing the chassis assembly Disassembly and reassembly- P2725QE 103...

  • Page 104: Installing The Chassis Assembly

    Installing the chassis assembly Steps Place the chassis assembly on the display panel. NOTE: Align the cross rib on the display middle-frame with the holes on the chassis assembly. Connect the LVDS cables to the connector on the display panel. Adhere four aluminum foils on the chassis assembly and display panel.
  • Page 105 Figure 95. Installing the chassis assembly Next steps Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725QE 105...

  • Page 106: Interface Board

    Interface board Removing the interface board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Steps Remove the mylar that covers the power board. Remove the eight screws (M3x6) that secure the interface board and power board to the chassis assembly.
  • Page 107 Figure 97. Removing the interface board Disassembly and reassembly- P2725QE 107...
  • Page 108 Figure 98. Removing the interface board 108 Disassembly and reassembly- P2725QE...

  • Page 109: Installing The Interface Board

    Installing the interface board Steps Connect the LVDS cables to the connector on the interface board. Connect the power cable to the connector on the interface board. Assemble the interface board and power board to the chassis. Replace the eight screws (M3x6) to secure the interface board and power board with the chassis assembly. Replace the screw (M4x9) to secure the power board with the chassis assembly.
  • Page 110 Figure 100. Installing the interface board 110 Disassembly and reassembly- P2725QE...
  • Page 111 Figure 101. Installing the interface board Next steps Install the chassis assembly. Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. Disassembly and reassembly- P2725QE 111...

  • Page 112: Power Board

    Power board Removing the power board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Remove the interface board. Steps Disconnect the lightbar cable from the connector on the power board. Figure 102.

  • Page 113: Installing The Power Board

    Installing the power board Steps Connect the lightbar cable to the connector on the power board. Figure 103. Installing the power board Next steps Install the interface board. Install the chassis assembly. Install the board. Install the keypad board. Install the back cover.

  • Page 114: Led Board

    LED board Removing the LED board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the keypad board. Remove the board. Remove the chassis assembly. Remove the interface board. Remove the power board.
  • Page 115 Figure 105. Removing the LED board Disassembly and reassembly- P2725QE 115...

  • Page 116: Installing The Led Board

    Installing the LED board Steps Align and place the LED board on the display middle-frame. Replace the screw (T2x3) to secure the LED board to the display middle-frame. Adhere the mylar to cover the LED board. Connect the lightbar cable to the connector on the power board. Align and place the display middle-frame on the display panel.
  • Page 117 Figure 107. Installing the LED board Disassembly and reassembly- P2725QE 117...
  • Page 118 Next steps Installing the power board. Install the interface board. Install the chassis assembly. Install the board. Install the keypad board. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor. 118 Disassembly and reassembly- P2725QE...

  • Page 119: Chapter 9: Troubleshooting Instructions

    Troubleshooting Instructions WARNING: Before you begin any of the procedures in this section, follow the Safety 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: Turn off both your computer and the monitor.

  • Page 120: Built-In Diagnostics

    Built-in diagnostics 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. Figure 109. Built-in diagnostics function buttons To run the built-in diagnostics: Ensure that the screen is clean (no dust particles on the surface of the screen).

  • Page 121: Common Problems

    • • A 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 Dell Support site at: https://www.dell.com/pixelguidelines. Cycle power On-Off. Stuck-on pixels LCD screen has bright spots •...
  • Page 122 Common symptoms Common symptoms Possible solutions Intermittent problems Monitor malfunctions on Ensure that the video cable connecting the monitor to the computer • and off is connected properly and is secure. • Reset the monitor to Factory Settings (Factory Reset). Perform a monitor self-test feature check to determine if the •...

  • Page 123: Product-Specific Problems

    Product-specific problems Table 9. Product-specific problems and solutions. Common symptoms Common symptoms Possible solutions The screen image is too The image is centered on • Check the Aspect Ratio setting in the Display settings OSD. small the screen, but does not fill Reset the monitor to factory settings (Factory Reset).
  • Page 124 If the Notebook requires a > 90 W power adapter, it may not charge • with the USB-C connection. • Ensure that you use only the Dell approved adapter or the adapter that comes with the product. Ensure that the USB-C cable is not damaged. •...

  • Page 125: Universal Serial Bus (Usb) Specific Problems

    Universal Serial Bus (USB) specific problems Table 10. Universal Serial Bus (USB) specific problems and solutions. Common symptoms Common symptoms Possible solutions USB interface is not working USB peripherals are not Check that your monitor is turned On. • working Reconnect the upstream cable to your computer.

  • Page 126: Chapter 10: Contacting Dell

    Contacting Dell To contact Dell for sales, technical support, or customer service issues, see https://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 about your purchase invoice, packing slip, bill, or Dell product catalog.

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