Dell Latitude 5421 Service Manual
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Dell Latitude 5421 Service Manual

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Latitude 5421
Service Manual
Regulatory Model: P137G
Regulatory Type: P137G003/P137G004
July 2021
Rev. A01

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Summary of Contents for Dell Latitude 5421

  • Page 1 Latitude 5421 Service Manual Regulatory Model: P137G Regulatory Type: P137G003/P137G004 July 2021 Rev. A01...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2021 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

  • Page 3: Table Of Contents

    Contents Chapter 1: Working on your computer....................7 Safety instructions................................7 Working inside your computer............................ 7 Entering Service Mode..............................9 Exiting Service Mode..............................10 After working inside your computer........................10 Chapter 2: Removing and installing components................11 Recommended tools................................11 Screw list....................................12 Major components of your system..........................14 SIM card tray..................................
  • Page 4 LED board................................... 40 Removing the LED board............................40 Installing the LED board..............................41 Heat sink and fan assembly............................42 Removing the heat sink and fan assembly - UMA configuration..............42 Installing the heat sink and fan assembly - UMA configuration............... 43 Removing the heat sink and fan assembly - Discrete configuration...............44 Installing the heat sink and fan assembly - Discrete configuration..............45 Speakers....................................
  • Page 5 Clearing CMOS settings..............................119 Clearing BIOS (System Setup) and System passwords..................120 Chapter 5: Troubleshooting......................121 Handling swollen Lithium-ion batteries........................121 Dell SupportAssist Pre-boot System Performance Check diagnostics.............. 122 Running the SupportAssist Pre-Boot System Performance Check.............. 122 Built-in self-test (BIST)..............................122 M-BIST..................................122 LCD Power rail test (L-BIST)..........................123...
  • Page 6 Chapter 6: Getting help......................127 Contacting Dell................................. 127 Contents...

  • Page 7: Chapter 1: Working On Your Computer

    You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that is shipped with the product or at www.dell.com/regulatory_compliance.
  • Page 8 ESD protection is an increasing concern. Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

  • Page 9: Entering Service Mode

    1. Shut down your computer and disconnect the AC adapter. 2. Hold <B> key on the keyboard and press the power button for 3 seconds or until the Dell logo appears on the screen. 3. Press any key to continue.

  • Page 10: Exiting Service Mode

    Once the computer shuts down, you may perform the replacement procedures without disconnecting the battery cable from the system board. Exiting Service Mode Service Mode allows users to immediately cut off electricity from the computer and conduct repairs without disconnecting the battery cable from the system board.

  • Page 11: Chapter 2: Removing And Installing Components

    Removing and installing components NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Topics: • Recommended tools • Screw list • Major components of your system • SIM card tray • Micro Secure Digital (SD) Card •...

  • Page 12: Screw List

    Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is restored when the component is replaced.
  • Page 13 Table 1. Screw list (continued) Component Screw type Quantity Screw image Keyboard assembly M2x2 Keyboard bracket M2x2 Display assembly M2.5x5 (display hinges to palm-rest assembly) Display hinge M2.5x3 (display hinges to display back cover) Display panel M2.5x3 Removing and installing components...

  • Page 14: Major Components Of Your System

    Major components of your system 1. Base cover Removing and installing components...

  • Page 15: Sim Card Tray

    16. WLAN card NOTE: Dell provides a list of components and their part numbers for the original system configuration purchased. These parts are available according to warranty coverages purchased by the customer. Contact your Dell sales representative for purchase options.

  • Page 16: Installing The Sim Card

    Steps 1. Insert a pin into the release hole to release the SIM card tray. 2. Push the pin to disengage the lock, and eject the SIM card tray. 3. Slide the SIM card tray out of the slot on the computer. 4.

  • Page 17: Micro Secure Digital (Sd) Card

    Steps 1. Insert a pin into the hole of the SIM card tray and push inward until the tray is released 2. Slide the SIM card tray out of the slot on the computer. 3. Place the SIM card into the SIM card tray with the metallic contact facing up. 4.

  • Page 18: Installing The Microsd Card

    Steps 1. Push the microSD card to release it from the slot. 2. Slide the microSD card from the computer. Installing the microSD card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the microSD card and provides a visual representation of the installation procedure.

  • Page 19: Base Cover

    Steps 1. Align the microSD card to its slot on the computer. 2. Slide and insert the microSD card into its slot until it clicks into place. Next steps 1. Follow the procedure in After working inside your computer. Base cover Removing the base cover Prerequisites 1.

  • Page 20: Installing The Base Cover

    Steps 1. Loosen the eight captive screws that secure the base cover to the palm-rest and keyboard assembly. 2. Using the flat-end of plastic scribe, pry the base cover from the U-shaped indents at the top edge of the base cover and continue to work on the sides to release the base cover from the palm-rest and keyboard assembly.
  • Page 21 Removing and installing components...

  • Page 22: Wireless Card

    Steps 1. Align the screw holes on the base cover with the screw holes on the palm-rest and keyboard assembly, and then snap the base cover into place. 2. Tighten the eight captive screws that secure the base cover to the palm-rest and keyboard assembly. Next steps 1.

  • Page 23: Installing The Wireless Card

    Steps NOTE: When removing the WLAN card from the system, if the adhesive pad which helps secure the WLAN card in place is removed from the system along with the WLAN card, adhere it back to the system. Loosen the captive screw that secures the wireless-card bracket to the wireless card and system board. 2.
  • Page 24 Steps 1. Connect the antenna cables to the wireless card. The following table provides the antenna-cable color scheme for the wireless card that is supported by your computer. Table 2. Antenna-cable color scheme Connectors on the Antenna-cable color Silkscreen marking wireless card △...

  • Page 25: Wireless Wide Area Network (Wwan) Card

    5. Follow the procedure in After working inside your computer. Wireless Wide Area Network (WWAN) Card Removing the WWAN card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the base cover. 4.

  • Page 26: Installing The Wwan Card

    For instructions on how to find your computer's IMEI (International Mobile Station Equipment Identity) number, see the knowledge base article 000143678 at www.dell.com/support. Steps 1. Connect the antenna cables to the WWAN card. The following table provides the antenna-cable color scheme: Table 3.

  • Page 27: Solid-State Drives

    3. Align and place the WWAN-card bracket on the system board and WWAN card. 4. Replace the single (M2x3) screw to secure the WWAN-card bracket and WWAN card to the palm-rest assembly. Next steps 1. Install the card. 2. Install the microSD card.

  • Page 28: Installing The 2230 Solid-State Drive

    Steps 1. Remove the two (M2x3) screws that secures the thermal plate to the palm-rest assembly. 2. Remove the single (M2x3) screw securing the solid-state drive assembly in place. 3. Slide and remove the solid-state drive assembly from the computer. 4.
  • Page 29 The following image indicates the location of the 2230 solid-state drive that is installed in M.2 slot and provides a visual representation of the installation procedure. Steps 1. Align the holes on the solid-state drive and solid-state drive bracket. 2. Replace the single (M2x3) screw securing the solid-state drive and the solid-state drive bracket to form a solid-state drive assembly.

  • Page 30: Removing The 2280 Solid-State Drive

    Removing the 2280 solid-state drive Prerequisites 1. Follow the procedure in Before working inside your computer. NOTE: Solid-state drives are fragile. Exercise care when handling the solid-state drive. NOTE: To avoid data loss, do not remove the solid-state drive while the computer is in sleep or on state. 2.
  • Page 31 About this task NOTE: Solid-state drives are fragile. Exercise care when handling the solid-state drive. NOTE: Depending on the configuration ordered, the computer one may support a 2280 solid-state drive, or a 2230 solid-state drive in M.2 slot. NOTE: This procedure is applicable if you are installing a 2280 solid-state drive in M.2 slot. The following image indicates the location of the 2280 solid-state drive that is installed in M.2 slot and provides a visual representation of the installation procedure.

  • Page 32: Memory

    About this task NOTE: Latitude 5421 supports two memory slots. The following images indicate the location of the memory module and provide a visual representation of the removal procedure. Steps 1. Pry the retention clips securing the memory module until the memory module pops-up.

  • Page 33: Battery

    About this task NOTE: Latitude 5421 supports two memory slots. The following image indicates the location of the memory module and provides a visual representation of the installation procedure. Steps 1. Align the notch on the memory module with the tab on the memory-module slot.

  • Page 34: Removing The Battery

    ● If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing, bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See www.dell.com/contactdell.

  • Page 35: Installing The Battery

    Steps 1. Disconnect the battery cable from the system board, if it was not disconnected earlier. 2. Remove the two (M2x3) screws that secure the battery to the palm-rest and keyboard assembly. 3. Lift the battery off the palm-rest and keyboard assembly. Installing the battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 36: Battery Cable

    Battery cable Removing the battery cable Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the battery. NOTE: If battery is disconnected from system board for service, then there is a delay during system boot as the system undergoes RTC battery reset.

  • Page 37: Assembly Inner Frame

    About this task The following image indicates the location of the battery cable and provides a visual representation of the installation procedure. Steps 1. Align and place the battery cable on the battery. 2. Route the battery cable through the routing guides on the battery. 3.
  • Page 38 About this task The following image indicates the location of the assembly inner frame and provides a visual representation of the removal procedure. Steps 1. Unroute the antenna cables from the routing guides on the assembly inner frame. 2. Disconnect the speaker cable from the connector on the system board and unroute the cable from the routing guides on the assembly inner frame.

  • Page 39: Installing The Assembly Inner Frame

    4. Remove the seven screws (M2x3) that secure the assembly inner frame to the system board and the palm-rest assembly . 5. Lift the assembly inner frame off the system board and the palm-rest assembly. Installing the assembly inner frame Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 40: Led Board

    Steps 1. Align the screw holes on the assembly inner frame with the screw holes on the system board and the palm-rest assembly. NOTE: Ensure that the tab on the top-left corner of the assembly inner frame is installed underneath the tab on the palm-rest assembly.

  • Page 41: Installing The Led Board

    About this task The following image indicates the location of the LED board and provides a visual representation of the removal procedure. Steps 1. Disconnect the LED-board cable from the connector on the system board. 2. Peel the LED-board cable off the coin-cell battery. 3.

  • Page 42: Heat Sink And Fan Assembly

    Steps 1. Align the screw hole on the LED board with the screw hole on the palm-rest assembly. 2. Replace the single screw (M2x3) to secure the LED board to the palm-rest assembly. 3. Route the LED-board cable and connect the cable to the connector on the system board. CAUTION: Do not route the LED-board cable under the coin-cell battery.

  • Page 43: Installing The Heat Sink And Fan Assembly - Uma Configuration

    NOTE: The heat sink may become hot during normal operation. Allow sufficient time for the heat sink to cool before you touch it. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover.

  • Page 44: Removing The Heat Sink And Fan Assembly - Discrete Configuration

    Steps 1. Align the screw holes on the heat sink and fan assembly with the screw holes on the system board. 2. In sequential order (as indicated on the heat sink), tighten the four (M2x3) and two (M2x5) screws that secure the heat sink and fan assembly to the system board.

  • Page 45: Installing The Heat Sink And Fan Assembly - Discrete Configuration

    Steps 1. In reverse sequential order (as indicated on the heat sink), remove the six (M2x3) and two (M2x5) screws that secure the heat sink and fan assembly to the system board. 2. Lift the heat sink and fan assembly off the system board. Installing the heat sink and fan assembly - Discrete configuration Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 46: Speakers

    Steps 1. Align the screw holes on the heat sink and fan assembly with the screw holes on the system board. 2. In sequential order (as indicated on the heat sink), tighten the six (M2x3) and two (M2x5) screws that secure the heat sink and fan assembly to the system board.

  • Page 47: Installing The Speakers

    Steps 1. Peel the tape that secures the speaker cable to the palm-rest and keyboard assembly. 2. Disconnect the speaker cable from the system board. 3. Note the speaker cable routing, and remove the speaker cable from the routing guides on the palm-rest and keyboard assembly.

  • Page 48: Usb Type-C Bracket

    Steps 1. Using the alignment posts and rubber grommets, place the speakers on the slots of the palm-rest and keyboard assembly. 2. Connect the speaker cable to the system board. 3. Route the speaker cable through the bottom-left corner of the system and ensure that the speaker cables are routed firmly into the routing channels on the inner frame.

  • Page 49: Installing The Usb Type-C Bracket

    Steps 1. Remove the three (M2x5) screws that secure the USB type-C bracket to the system board. 2. Lift the USB type-C bracket off the system. Installing the USB type-C bracket Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the USB type-C bracket and provides a visual representation of the installation procedure.

  • Page 50: System Board

    Steps 1. Place the USB type-C bracket on the system board and align the holes of the bracket and the system board. 2. Replace the three (M2x5) screws to secure the USB type-C bracket to the system board. Next steps 1.
  • Page 51 12. Remove the assembly inner frame. About this task The following image indicates the connectors on your system board. Figure 1. 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.
  • Page 52 Steps NOTE: The system board can be removed and installed with the heat sink attached in order to simplify the procedure and preserve the heat sink 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.

  • Page 53: Installing The System Board

    NOTE: For the models shipped with a fingerprint reader, disconnect the fingerprint reader cable from the connector on the system board before removing the system board from the palm-rest assembly and keyboard assembly. 1. Remove the two (M2x3) screws that secure the eDP/display cable bracket to the system board. 2.
  • Page 54 Figure 2. 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. Memory modules 7. Battery cable connector 8. Clickpad cable connector 9. USH board connector 10.
  • Page 55 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.

  • Page 56: Power-Button 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.

  • Page 57: Installing The Power-Button 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. The following images indicate the location of the power-button board and provide a visual representation of the removal procedure.

  • Page 58: Smart Card Reader

    Steps 1. Align and place the power-button board on the palm-rest assembly. 2. Replace the two (M2x2.5) screws that secure the power-button board to the palm-rest assembly. Next steps 1. Install the system board. NOTE: The system board can be installed with the heat sink attached in order to simplify the procedure and preserve the thermal bond between the system board and heat sink.
  • Page 59 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the 2280 solid-state drive 2230 solid-state drive. 7. Remove the WLAN card. 8. Remove the WWAN card. 9. Remove the battery. 10. Remove the assembly inner frame.

  • Page 60: Installing The Smart Card Reader

    Installing the smart card reader Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the smart card reader and provides a visual representation of the installation procedure.

  • Page 61: Coin-Cell Battery

    5. Install the WLAN card. 6. Install the base cover. 7. Install the microSD card. 8. Install the card. 9. Follow the procedure in After working inside your computer. Coin-cell battery Removing the coin-cell battery Prerequisites 1. Follow the procedure in Before working inside your computer.

  • Page 62: Installing The Coin-Cell Battery

    Steps 1. Disconnect the coin-cell battery cable from the connector. 2. Remove the coin-cell battery from the palm-rest assembly. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the coin-cell battery and provides a visual representation of the installation procedure.

  • Page 63: Keyboard Assembly

    Steps 1. Adhere the coin-cell battery to the slot on the palm-rest assembly. 2. Connect the coin-cell battery cable to the connector. Next steps 1. Install the board. 2. Install the power-button board. 3. Install the SIM-card slot filler for models shipped without a WWAN card. 4.
  • Page 64 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the memory module. 7. Remove the 2280 solid-state drive 2230 solid-state drive. 8. Remove the WLAN card. 9. Remove the WWAN card. 10. Remove the battery. 11. Remove the heat sink - discrete based on the system configuration.

  • Page 65: Installing The Keyboard Assembly

    Lift the latch and disconnect the keyboard cable and keyboard backlit cable (for models that are shipped with the keyboard backlight) from the touchpad. 2. Remove the eighteen (M2x2) screws that secure the keyboard assembly to the palm-rest. 3. Carefully lift the keyboard assembly from the palm-rest. 4.

  • Page 66: Keyboard Bracket

    Steps 1. Align and place the keyboard assembly on the palm-rest assembly. 2. Replace the eighteen (M2x2) screws that secure the keyboard assembly to the palm-rest. 3. Connect the keyboard cable and keyboard backlit cable to its connectors on the touchpad. NOTE: For models shipped with a USH module, connect the USH cable to the keyboard bracket.
  • Page 67 Steps 1. Remove the five (M2x2) screws that secure the keyboard to the keyboard bracket. 2. Remove the keyboard from the keyboard bracket. Removing and installing components...

  • Page 68: Installing The Keyboard Bracket

    Installing the keyboard bracket Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task NOTE: The system board can be installed with the heat sink attached in order to simplify the procedure and preserve the thermal bond between the system board and heat sink.

  • Page 69: Display Assembly

    Steps 1. Align and place the keyboard on the keyboard bracket. 2. Replace the five (M2x2) screws to secure the keyboard to the keyboard bracket. Next steps 1. Install the keyboard assembly. 2. Install the system board. 3. Install the assembly inner frame.
  • Page 70 Removing and installing components...

  • Page 71: Installing The Display Assembly

    Steps 1. Remove the two (M2x3) screws that secure the eDP cable bracket to the system board. 2. Lift the eDP cable bracket away from the system. 3. Peel the tape that secures the display cable to the system board. 4.
  • Page 72 Removing and installing components...
  • Page 73 Removing and installing components...
  • Page 74 Steps 1. Place the display assembly on the system. Align the screw holes on the display hinges with screw holes on the palm-rest assembly. 2. Replace the four (M2.5x5) screws that secure the display hinges to the palm-rest assembly. 3. Close the display. 4.

  • Page 75: Display Bezel

    12. Replace the two screws (M2x3) that secure the eDP cable bracket to the system board. Next steps 1. Install the WWAN card. 2. Install the WLAN card. 3. Install the base cover. 4. Install the microSD card. 5. Install the card.

  • Page 76: Installing The Display Bezel

    Steps NOTE: The display bezel is adhered to the display panel with adhesive. Insert a plastic scribe into the recesses near both hinge caps to start the prying process to release the display bezel. Pry along the outside edge of the display bezel and work your way around the entire display bezel until the display bezel is separated from the display cover.

  • Page 77: Display Panel

    5. Install the microSD card. 6. Install the card. 7. Exit Service Mode. 8. Follow the procedure in After working inside your computer. Display panel Removing the display panel Prerequisites 1. Follow the procedure in Before working inside your computer. 2.
  • Page 78 Removing and installing components...
  • Page 79 Removing and installing components...

  • Page 80: Installing The Display Panel

    Steps NOTE: The display panel is preassembled with the display brackets as a single service part. Do not pull the Stretch Release (SR) tapes and separate the brackets from the display panel. 1. Remove the two screws (M2.5x3) that secure the display panel to the display back cover. NOTE: While removing the display panel, disengage the display panel tabs from the display cover before flipping it over.
  • Page 81 About this task The following images indicate the location of the display panel and provide a visual representation of the installation procedure. Removing and installing components...
  • Page 82 Removing and installing components...
  • Page 83 Removing and installing components...
  • Page 84 Steps 1. Connect the display cable to the connector on the display panel and close the latch. 2. Adhere the clear tape to cover the display cable connector. 3. Adhere the conductive tape to secure the display cable to the display panel. 4.

  • Page 85: Camera/Microphone Module

    Camera/microphone module Removing the camera Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the display assembly. 7. Remove the display bezel.

  • Page 86: Removing The Infrared Camera

    About this task The following image indicates the location of the camera and provides a visual representation of the installation procedure. Steps 1. Align and place the camera module into the slot on the display back cover. 2. Connect the camera cable to the connector on the camera module. 3.

  • Page 87: Installing The Infrared Camera

    Steps 1. Peel the tape that secures the infrared camera cable. NOTE: An abrupt peeling may also remove the camera shutter from the display bezel and damage the camera shutter. 2. Lift the latch and disconnect the infrared camera cable from the connector on the camera module. 3.

  • Page 88: Edp/Display Cable

    Steps 1. Align and place the infrared camera module into the slot on the display back cover. 2. Connect the infrared camera cable to the connector on the camera module. 3. Adhere the tape to secure the infrared camera cable in place. Next steps 1.

  • Page 89: Installing The Edp Cable

    About this task The following images indicate the location of the eDP cable and provide a visual representation of the removal procedure. Steps 1. Disconnect the eDP/display cable from the connector on the camera/microphone module. 2. Peel the conductive tape and unroute the eDP/display cable to release it from adhesive and lift the eDP/display cable from the display back cover.
  • Page 90 Steps 1. Connect the eDP/display cable to the connector on the camera. 2. Adhere the eDP/display cable to the display back cover. 3. Adhere the conductive tape and route the eDP/display cable to the display back cover. Next steps 1. Install the display panel.

  • Page 91: Sensor Board

    Sensor board Removing the sensor board Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the WLAN card. 7.

  • Page 92: Display Hinges

    Steps 1. Align and place the sensor board on the display back cover. 2. Connect the display cable to the connector on the sensor board and close the latch. Next steps 1. Install the display panel. 2. Install the display bezel.

  • Page 93: Installing The Display Hinges

    About this task The following images indicate the location of the display hinges and provide a visual representation of the removal procedure. Steps 1. Remove the two (M2.5x5) screws that secure the right hinge to the display back cover. 2. Lift and remove the right hinge from the display back cover. 3.
  • Page 94 Steps 1. Align the screw hole on the left hinge with the screw hole on the display back cover. 2. Replace the two (M2.5x5) screws to secure the left hinge to the display back cover. 3. Align the screw hole on the right hinge with the screw hole on the display back cover. 4.

  • Page 95: Display Back Cover

    Display back cover Removing the display back cover Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the WLAN card.

  • Page 96: Installing The Display Back Cover

    Installing the display back cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the display back cover and provides a visual representation of the installation procedure.

  • Page 97: Dummy Sim-Card Slot Filler

    Dummy SIM-card slot filler Removing the dummy SIM-card slot filler Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the memory module.

  • Page 98: Installing The Dummy Sim-Card Slot Filler

    Steps 1. Push the dummy SIM-card slot filler from the top side of the palm-rest assembly. 2. Gently lift the dummy SIM-card slot filler out of the palm-rest assembly. Installing the dummy SIM-card slot filler Prerequisites If you are replacing a component, remove the necessary component before the installation procedure. About this task The following image indicates the location of the dummy SIM-card slot filler and provides a visual representation of the dummy SIM-card slot filler installation procedure.
  • Page 99 Steps 1. Place the dummy SIM-card slot filler into its compartment on the palm rest. NOTE: Ensure that the dummy SIM-card slot filler is aligned with the ribs on the palm-rest assembly. 2. Press the dummy SIM-card slot filler until it clicks into place and ensure it fits securely into the SIM card slot. Next steps 1.

  • Page 100: Palm-Rest Assembly

    Palm-rest assembly Removing the palm-rest assembly Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the card. 4. Remove the microSD card. 5. Remove the base cover. 6. Remove the memory module. 7.

  • Page 101: Installing The Palm-Rest Assembly

    Steps After performing the steps in the pre-requisites, we are left with the palm-rest assembly. Installing the palm-rest assembly Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the palm-rest assembly and provides a visual representation of the installation procedure. Removing and installing components...
  • Page 102 Steps NOTE: For non-WWAN LTE configuration, you must remove and transfer the dummy SIM-card filler when replacing the palm-rest assembly. 1. Place the palm-rest assembly on a flat surface. 2. Remove the dummy SIM card filler for the non-WWAN LTE configuration. Next steps 1.
  • Page 103 20. Follow the procedure in After working inside your computer. Removing and installing components...

  • Page 104: Chapter 3: Drivers And Downloads

    Downloading the drivers Steps 1. Turn on your computer. 2. Go to www.dell.com/support. 3. Enter the Service Tag of your computer, and then click Submit. NOTE: If you do not have the Service Tag, use the auto-detect feature or manually browse for your computer model.

  • Page 105: Chapter 4: System Setup

    System setup CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup program. Certain changes can make your computer work incorrectly. NOTE: Before you change BIOS Setup program, it is recommended that you write down the BIOS Setup program screen information for future reference.

  • Page 106: One Time Boot Menu

    Table 4. Navigation keys (continued) Keys Navigation Down arrow Moves to the next field. Enter Selects a value in the selected field (if applicable) or follow the link in the field. Spacebar Expands or collapses a drop-down list, if applicable. Moves to the next focus area.
  • Page 107 Table 5. System setup options—System information menu (continued) Overview Battery State Displays the battery state of the computer. Health Displays the battery health of the computer. AC Adapter Displays whether the AC adapter is connected or not. Battery Life Type Displays the type of battery life Processor Information Processor Type...
  • Page 108 Table 6. System setup options—Boot Configuration menu Boot Configuration Boot Sequence Boot mode Displays the boot mode. Boot Sequence Displays the boot sequence. Secure Digital (SD) Card Boot Enable or disable the SD card read-only boot. By default, the Enable Secure Digital (SD) Card Boot option is not enabled. Secure Boot Enable Secure Boot Enable or disable the secure boot feature.
  • Page 109 By default, the Video/Power only on Type-C Ports option is disabled. Type-C Dock Override Enables to use connected Type-C Dell Dock to provide data stream with external USB ports disabled. When Type-C Dock override is enabled, the Video/Audio/Lan submenu is activated.
  • Page 110 Table 9. System setup options—Display menu Display Display Brightness Brightness on battery power Enable to set screen brightness when the computer is running on battery power. Brightness on AC power Enable to set screen brightness when the computer is running on AC power. Touchscreen Enable or disable touchscreen By default, the option is enabled.
  • Page 111 By default, the Optimized option is enabled. USB Wake Support Wake on Dell USB-C Dock When enabled, connecting a Dell USB-C Dock will wake the computer from standby. By default, the Wake on Dell USB-C Dock option is enabled. Block Sleep Enables to block entering sleep (S3) mode in the operating system.
  • Page 112 Table 12. System setup options—Security menu (continued) Security Key Storage Enable Enables to control whether the Trusted Platform Module (TPM) Storage Hierarchy is available to the operating system. By default, the Key Storage Enable option is enabled. SHA-256 BIOS and the TPM will use the SHA-256 hash algorithm to extend measurements into the TPM PCRs during BIOS boot.
  • Page 113 Allow Non-Admin PSID Revert Enable Allow Non-Admin PSID Revert Controls access to the Physical Security ID (PSID) revert of NVMe hard-drives from the Dell Security Manager prompt. By default, the option is disabled. Table 14. System setup options—Update, Recovery menu...
  • Page 114 By default, the option is enabled. Dell Auto OS Recovery Threshold Controls the automatic boot flow for SupportAssist System Resolution Console and for Dell OS Recovery Tool. By default, the threshold value is set to 2. Table 15. System setup options—System Management menu...
  • Page 115 Table 16. System setup options—Keyboard menu (continued) Keyboard By default, the option is enabled. Table 17. System setup options—Pre-boot Behavior menu Pre-boot Behavior Adapter Warnings Enable Adapter Warnings Enable or disable the warning messages during boot when the adapters with less power capacity are detected.

  • Page 116: Updating The Bios

    If the recovery key is not known this can result in data loss or an unnecessary operating system re-install. For more information on this subject, see Knowledge Article: https:// www.dell.com/support/article/sln153694 System setup...

  • Page 117: Updating The Bios In Linux And Ubuntu

    Steps 1. Go to www.dell.com/support. 2. Click Product support. In the Search support box, enter the Service Tag of your computer, and then click Search. NOTE: If you do not have the Service Tag, use the SupportAssist feature to automatically identify your computer. You can also use the product ID or manually browse for your computer model.

  • Page 118: System And Setup Password

    One-Time boot menu on the computer. Most of the Dell computers built after 2012 have this capability, and you can confirm by booting your computer to the F12 One-Time Boot Menu to see if BIOS FLASH UPDATE is listed as a boot option for your computer. If the option is listed, then the BIOS supports this BIOS update option.

  • Page 119: Deleting Or Changing An Existing System Setup Password

    About this task To enter the system setup, press F12 immediately after a power-on or reboot. Steps 1. In the System BIOS or System Setup screen, select Security and press Enter. The Security screen is displayed. 2. Select System/Admin Password and create a password in the Enter the new password field. Use the following guidelines to assign the system password: ●...

  • Page 120: Clearing Bios (System Setup) And System Passwords

    Clearing BIOS (System Setup) and System passwords About this task To clear the system or BIOS passwords, contact Dell technical support as described at www.dell.com/contactdell. NOTE: For information on how to reset Windows or application passwords, refer to the documentation accompanying Windows or your application.

  • Page 121: Chapter 5: Troubleshooting

    ● Using a non-Dell or incompatible battery may increase the risk of fire or explosion. Replace the battery only with a compatible battery purchased from Dell that is designed to work with your Dell computer. Do not use a battery from other computers with your computer.

  • Page 122: Dell Supportassist Pre-Boot System Performance Check Diagnostics

    Check diagnostics About this task SupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The Dell SupportAssist Pre-boot System Performance Check diagnostics is embedded with the BIOS and is launched by the BIOS internally. The embedded system diagnostics provides a set of options for particular devices or device groups allowing you to: ●...

  • Page 123: Lcd Power Rail Test (L-Bist)

    LCD Built-in Self Test (BIST) Dell laptops have a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent problem with the LCD (screen) of the Dell laptop or with the video card (GPU) and PC settings.

  • Page 124: System Diagnostic Lights

    System diagnostic lights Battery-status light Indicates the power and battery-charge status. Solid white — Power adapter is connected and the battery has more than 5 percent charge. Amber — Computer is running on battery and the battery has less than 5 percent charge. ●...

  • Page 125: Recovering The Operating System

    It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its factory state. You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their primary operating system due to software or hardware failures.

  • Page 126: Wifi Power Cycle

    5. Press and hold the power button for 20 seconds to drain the flea power. 6. Install the battery. 7. Install the base cover. 8. Connect the power adapter to your computer. 9. Turn on your computer. NOTE: For more information about performing a hard reset, see the knowledge base article SLN85632 www.dell.com/support. Troubleshooting...
  • Page 127 About this task Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues: Steps 1.

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