Dell 14 Plus 2-in-1 DB04255 Owner's Manual

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Removing the system board

CAUTION:The information in this section is intended for authorized service technicians only.

Prerequisites

  1. Follow the procedure in Before working inside your computer.
  2. Remove the base cover.
  3. Remove the battery.
  4. Remove the wireless card.
  5. Remove the M.2 2230 solid-state drive.
  6. Remove the heat sink.
  7. Remove the USB Type-C bracket.
  8. Remove the display assembly.

About this task

The following image indicates the connectors on your system board.
Figure 1. Connectors on the system board
Image: Connectors on the system board
  1. Fan-cable connector (FAN)
  2. Display-cable connector (LCD)
  3. Keyboard-backlight cable connector (KBBL)
  4. Battery-cable connector (BATT)
  5. Keyboard-cable connector (KB)
  6. Touchpad-cable connector (TP)
  7. Speaker-cable connector (SPK)
  8. Wireless-card connector (WLAN)
  9. M.2 solid state drive connector (SSD)
  10. I/O-board cable connector (IOBD)

The following images indicate the location of the system board and provide a visual representation of the removal procedure.

Figure 2. Removing the USB Type-C bracket and screws
Removing the USB Type-C bracket and screws
Figure 3. Disconnecting the cables from the system board
Disconnecting the cables from the system board
Figure 4. Removing the system board
Removing the system board

Steps

  1. Remove the three screws (M2.5x4) that secure the left display hinge to the palm-rest and keyboard assembly.
  2. Pry open the left display hinge to an angle of 90 degrees.
  3. Remove the two screws (M2x4) that secure the USB Type-C bracket to the palm-rest and keyboard assembly.
  4. Lift to remove the USB Type-C bracket from the palm-rest and keyboard assembly.
  5. Lift the latch and disconnect the fan cable from the fan cable connector (FAN) on the system board.
  6. Lift the I/O-board cable connector (IOBD) latch and disconnect the I/O-board cable from the system board.
  7. Disconnect the speaker cable from the speaker-cable connector (SPK) on the system board.
  8. Lift the latch and disconnect the touchpad cable from the touchpad-cable connector (TP) on the system board.
  9. Lift the latch and disconnect the keyboard cable from the keyboard-cable connector (KB) on the system board.
  10. Lift the latch and disconnect the keyboard-backlight cable from the keyboard-backlit cable connector (KBBL) on the system board.
  11. Lift the latch and disconnect the display cable from the display-cable connector (LCD) on the system board.
  12. Remove the two screws (M2x1.8) that secure the system board to the palm-rest and keyboard assembly.
  13. Lift the system board off the palm-rest and keyboard assembly.
    NOTE:Lift the system board carefully at an angle to clear the positioning pin so that it does not damage the system board-printed circuit board (PCB).
    Figure 5. System board pin
    System board pin
    Figure 6. System board pin
    System board pin

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