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Latitude 5540 Owner's Manual

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Removing the palm-rest assembly

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 SIM card.
  3. Remove the base cover.
  4. Remove the 4G WWAN card or 5G WWAN card, as applicable.
  5. Remove the WLAN card.
  6. Remove the memory modules.
  7. Remove the M.2 2230 or M.2 2280 solid-state drive from Slot 1, as applicable.
  8. Remove the M.2 2230 solid-state drive from Slot 2, if applicable.
  9. Remove the battery.
  10. Remove the assembly-inner frame.
  11. Remove the system board.
    NOTE:The system board can be removed with the heat sink attached in order to simplify the procedure and preserve the thermal bond between the system board and heat sink.
  12. Remove the display assembly.
  13. Remove the smart-card reader, if applicable.
  14. Remove the fingerprint reader, if applicable.

About this task

NOTE:When replacing the palmrest assembly, transfer the dummy SIM filler to the new palmrest assembly.

Image: Removing the palm-rest assembly

The following images indicate the location of the palm-rest assembly and provide a visual representation of the removal procedure.
NOTE:For computers with smart-card reader configuration, the smart-card reader is pre-installed in the replacement palm-rest assembly.
NOTE:For computers with NFC configuration, the NFC board is pre-installed in the replacement palm-rest assembly.
NOTE:For computers with FIPS fingerprint reader configuration, the FIPS fingerprint reader is pre-installed in the replacement palm-rest assembly.
NOTE:For computers with power button and fingerprint reader, the power button must be transferred to replacement palm-rest assembly.
Image: Removing the palm-rest assembly

Steps

After performing the steps in the pre-requisites, we are left with the palm-rest assembly.

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