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Latitude 3420 Service Manual for computers with discrete graphics

PDF

Removing the system board

Prerequisites

  1. Follow the procedure in before working inside your computer.
  2. Remove the microSD-card.
  3. Remove the SIM card tray for 4G LTE enabled systems.
  4. Remove the base cover.
  5. Remove the battery.
  6. Remove the memory module.
  7. Remove the M.2 SSD.
  8. Remove the hard-disk drive for systems shipped with hard-disk drive.
  9. Remove the WLAN card.
  10. Remove the heatsink assembly.

About this task

System board connectors

NOTE:The location of the memory module may vary depending on your system.
Image: Removing the screws that secure the base cover to the palm-rest and keyboard assembly
  1. System fan cable connector
  2. Display cable connector
  3. Power adapter port connector
  4. Memory module connector
  5. Keyboard backlit LED cable connector
  6. Keyboard cable connector
  7. Touchpad cable connector
  8. Battery cable connector
  9. WLAN card connector
  10. Hard-disk drive cable connector
  11. USB cable connector
  12. Speaker cable connector
  13. I/O cable connector
  14. M.2 SSD connector

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

Image: Removing the screws that secure the base cover to the palm-rest and keyboard assembly

Image: Removing the screws that secure the base cover to the palm-rest and keyboard assembly

Steps

  1. Remove the (M2.5x6) and the (M2.5x4) screws that secure the hinge to the palmrest assembly.
  2. Lift the hinge in upward direction away from the palmrest assembly.
  3. For 4G LTE enabled systems, peel the WWAN I/O board cable from the palmrest assembly.
  4. Disconnect the speaker cable, power adapter port cable, hard-disk drive cable, and system fan cable from the connector on the system board.
  5. Open the latch and disconnect the touchpad cable, keyboard cable, and USB cable from the connector on the system board.
  6. Peel the adhesive, open the latch, and disconnect the display cable and I/O cable from the connector on the system board.
  7. Remove the two (M2x5) screws that secure the type-c bracket in place.
  8. Lift and remove the type-c bracket from the system board.
  9. Remove the two (M2x2) screws that secure the system board in place.
  10. Lift and remove the system board from the palmrest assembly.
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