Service Manual
Table Of Contents
- Latitude 5420 Service Manual
- Contents
- Working inside your computer
- Major components of your computer
- Removing and installing components
- Recommended tools
- Screw list
- Disassembly and reassembly
- Subscriber Identity Module (SIM) card
- Micro Secure Digital (SD) Card
- Base cover
- WLAN card
- WWAN card
- Solid-state drive
- Memory modules
- Battery
- Battery cable
- Assembly inner frame
- LED board
- Heat sink
- Speakers
- System board
- Power-button board
- Smart card reader
- Keyboard assembly
- Keyboard bracket
- Display assembly
- Display bezel
- Display panel
- Camera/microphone module
- eDP/display cable
- Sensor board
- Display hinges
- Display back cover
- Dummy SIM-card slot filler
- Palm-rest assembly
- Software
- BIOS setup
- Troubleshooting
- Getting help and contacting Dell
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 screws (M2x3) 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 screws (M2x5) that secure the USB Type-C bracket to the system board.
5. Connect the USH board cable to the system board and close the latch to secure the cable to the system board.
6. Connect the touch pad cable to the system board and close the latch to secure the cable to the system board.
7. Route the coin-cell battery cable under the system board and connect the coin-cell battery cable to the connector on the
system board.
8. Route the display and eDP/display cable through the routing guide on the system board.
9. Connect the eDP/display cable to the connector on the system board.
10. Connect the display cable to the connector on the system board.
11. Adhere the tape that secures the display cable to the system board.
12. Align the screw holes on the eDP/display cable bracket with the screw holes on the system board.
13. Replace the two screws (M2x3) that secure the eDP/display cable bracket to the system board.
Next steps
1. Install the assembly inner frame.
2. Install the battery.
3. Install the solid-state drive.
4. Install the heat sink.
5. Install the memory module.
6. Install the WWAN card.
7. Install the WLAN card.
8. Install the base cover.
9. Install the microSD card.
10. Install the SIM card.
11. Follow the procedure in After working inside your computer.
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Removing and installing components