Skip to main content
Sign Out

Welcome to Dell

My Account
  • Place orders quickly and easily
  • View orders and track your shipping status
  • Enjoy members-only rewards and discounts
  • Create and access a list of your products
Sign In Create an Account Dell Financial Services Premier Sign In Partner Program Sign In
Contact Us

Your Dell.com Carts

Latitude 5421 Service Manual

PDF

Installing the system board

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

About this task

The following image indicates the connectors on your system board.

Figure 1. System board connectors
System board connectors
  1. Fingerprint reader connector
  2. WWAN connector
  3. Camera/IR cable connector
  4. eDP/display cable connector
  5. Touch and sensor cable connector
  6. Fan connector
  7. Memory modules
  8. Battery cable connector
  9. Touchpad cable connector
  10. USH board connector
  11. WLAN connector
  12. Solid-state drive slot
  13. Coin-cell battery cable connector
  14. Speaker cable connector
  15. Battery LED cable connector

The following image indicates the location of the system board and provides a visual representation of the installation procedure.

Installing the system board

Installing the system board

Steps

NOTE:The system board can be removed and installed with the thermal module attached in order to simplify the procedure and preserve the thermal bond between the system board and heat-sink. In order to do so, technicians must also remove the two (M2x5) screws the secure the system fan to the system board.

  1. Slide the system board to make the USB Type-C connector to toe-in to the hinge saddle and align the screw holes on the system board with the screw holes on the palm-rest assembly and keyboard assembly.
  2. Replace the four (M2x3) screws to secure the system board to the palm-rest assembly and keyboard assembly.
  3. Align and place the USB Type-C bracket on the system board.
  4. Replace the three (M2x5) screws that secure the USB Type-C bracket to the system board.
  5. Route the coin-cell battery cable under the system board and connect the coin-cell battery cable to the connector on the system board.
  6. Connect the touchpad cable to the system board and close the latch to secure the cable to the system board.
  7. Connect the USH board cable to the system board and close the latch to secure the cable to the system board.
  8. Connect the touch screen cable from the connector on the system board (for models shipped with a touch screen).
  9. Connect IR camera cable from the connector on the system board (for models shipped with an IR camera).
  10. Route the display and eDP/display cable through the routing guide on the system board.
  11. Connect the eDP/display cable to the connector on the system board.
  12. Connect the display cable to the connector on the system board.
  13. Adhere the tape that secures the display cable to the system board.
  14. Align the screw holes on the eDP/display cable bracket with the screw holes on the system board.
  15. Replace the two (M2x3) screws that secure the eDP/display cable bracket to the system board.

Next steps

  1. Install the assembly inner frame.
  2. Install the heat sink - UMA or discrete based on the system configuration.
  3. Install the battery.
  4. Install the WWAN card.
  5. Install the WLAN card.
  6. Install the 2280 solid-state drive or 2230 solid-state drive.
  7. Install the memory module.
  8. Install the base cover.
  9. Install the microSD card.
  10. Install the SIM card.
  11. Exit Service Mode.
  12. Follow the procedure in After working inside your computer.

Rate this content

Accurate
Useful
Easy to understand
Was this article helpful?
0/3000 characters
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please select whether the article was helpful or not.
  Comments cannot contain these special characters: <>()\