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Latitude 3340/Latitude 3340 2-in-1 Service Manual

PDF

Removing the system board

Prerequisites

  1. Follow the procedure in Before working inside your computer.
  2. Remove the base cover.
  3. Remove the battery.
  4. Remove the M.2 2230 solid-state drive or the M.2 2280 solid-state drive, whichever applicable.
  5. Remove the wireless card.
  6. Remove the thermal fan.
  7. Remove the thermal heatsink.

About this task

The following image indicates the connectors on your system board.

Figure 1. System-board connectors
Image of system board connectors of Latitude 3340
  1. Fan cable connector
  2. Display cable connector
  3. DC-in port connector
  4. WLAN card connector
  5. Touchpad cable connector
  6. Battery cable connector
  7. M.2 solid-state drive connector
  8. I/O board cable connector
  9. Speaker cable connector

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

Image of removing the system board - part 1

Image of removing the system board - part 2

CAUTION:The system has a coin-cell battery that is connected to the I/O board. Disconnecting the I/O board cable resets the BIOS setup program settings to default. Note the BIOS setup program settings before disconnecting the I/O board cable.

Steps

  1. Remove the two screws (M2.5x4) that secure the display-cable bracket to the system board.
  2. Remove the display-cable bracket from the system board.
  3. Remove the two screws (M2.5x4) that secure the right display hinge to the system board.
  4. Lift the right display hinge in upward direction away from the system board.
  5. Remove the screw (M2.5x4) that secures the USB type-C bracket to the system board.
  6. Lift and remove the USB type-C bracket from the system board.
  7. Disconnect the following cables from the respective connectors on the system board:
    1. Touchpad cable
    2. I/O board cable
    3. Speaker cable
    4. Fan cable
    5. Display cable
    6. Power adapter port cable
  8. Remove the two screws (M2x2) that secure the system board to the palm-rest and keyboard assembly.
  9. Lift and remove the system board from the palm-rest and keyboard assembly.

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