Dell Latitude 3520 Service Manual
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Dell Latitude 3520 Service Manual

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Latitude 3520
Service Manual
Regulatory Model: P108F
Regulatory Type: P108F001/P108F002
August 2021
Rev. A02

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Summary of Contents for Dell Latitude 3520

  • Page 1 Latitude 3520 Service Manual Regulatory Model: P108F Regulatory Type: P108F001/P108F002 August 2021 Rev. A02...
  • 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 inside your computer..................7 Safety instructions................................7 Before working inside your computer........................7 Entering Service Mode..............................8 Exiting Service Mode..............................8 Safety precautions................................ 8 Electrostatic discharge—ESD protection....................... 9 ESD field service kit ..............................9 Transporting sensitive components.........................10 After working inside your computer........................
  • Page 4 Installing the hard-disk drive bracket........................33 Installing the hard-disk drive assembly........................34 WLAN card..................................35 Removing the WLAN card............................35 Installing the WLAN card............................36 WWAN card..................................38 Removing the WWAN card............................38 Installing the WWAN card............................39 System fan..................................40 Removing the system fan............................40 Installing the system fan.............................41 Battery....................................
  • Page 5 Removing the system board - for computers with integrated graphics card..........74 Installing the system board - for computers with integrated graphics card..........77 Speakers....................................79 Removing the speaker..............................79 Installing the speaker..............................80 Touchpad .................................... 81 Removing the touchpad............................. 81 Installing the touchpad...............................82 WWAN I/O board ................................83 Removing the WWAN I/O board..........................
  • Page 6 Chapter 5: Troubleshooting......................118 Handling swollen Lithium-ion batteries........................118 Dell SupportAssist Pre-boot System Performance Check diagnostics...............118 Running the SupportAssist Pre-Boot System Performance Check............... 119 Built-in self-test (BIST)..............................119 M-BIST..................................119 LCD Power rail test (L-BIST)..........................120 LCD Built-in Self Test (BIST)..........................120 System-diagnostic lights..............................120...

  • Page 7: Chapter 1: Working Inside Your Computer

    Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.

  • Page 8: 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 9: Electrostatic Discharge-Esd Protection

    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 10: Transporting Sensitive Components

    It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all insulator parts while performing service and that they use anti-static bags for transporting sensitive components.

  • 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. Recommended tools The procedures in this document may require the following tools: ● Phillips #0 screwdriver ● Plastic scribe Screw List The following table shows the screw list and the image of the screws.
  • Page 12 Table 1. Screw list (continued) Component Screw type Quantity Image Display hinges M2.5x6 M2.5x4 Hinge bracket M2.5x2.5 M2.5x3 Captive screws Heatsink assembly 7 (For systems enabled with discrete graphic card) 4 (For systems enabled with integrated graphic card) Power adapter port M2x3 Ethernet port M2x5...

  • Page 13: Major Components Of Your System

    Major components of your system Removing and installing components...

  • Page 14: Microsd-Card

    20. Power-button board 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 15: Installing The Microsd-Card

    Steps 1. Push the microSD-card to eject it from the slot. 2. Remove the microSD-card from the system. 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 provides a visual representation of the MicroSD-card installation procedure.

  • Page 16: Installing The Sim Card Tray

    Steps 1. Insert the SIM card removal 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: Base Cover

    Steps 1. Insert the SIM card removal pin into the release hole to remove 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 18 About this task The following images indicate the location of the base cover and provide a visual representation of the removal procedure. Removing and installing components...

  • Page 19: Installing The Base Cover

    Steps 1. Loosen the nine captive screws that secure the base cover to the palmrest assembly. 2. Using a plastic scribe, pry open the base cover starting from the recesses located in the U-shaped indents near the hinges at the top edge of the base cover. 3.

  • Page 20: Battery Cable

    Steps 1. Align and place the base cover on the palmrest assembly, and snap the base cover latches into place. 2. Tighten the nine captive screws to secure the base cover to the computer chassis. Next steps 1. Exit the service mode 2.

  • Page 21: Removing The Battery Cable

    ● 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 22: Installing The Battery Cable

    Installing the battery cable 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 battery cable and provides a visual representation of the installation procedure. Steps 1.

  • Page 23: Installing The Memory Module

    4. Enter the service mode. 5. Remove the base cover. About this task The following image indicates the location of the memory module and provides a visual representation of the removal procedure. NOTE: The location of the memory module may vary depending on your system. Steps 1.
  • Page 24 About this task The following image indicates the location of the memory module and provides a visual representation of the installation procedure. NOTE: The location of the memory module may vary depending on your system. Steps 1. Lift the mylar to find the memory module slot. 2.

  • Page 25: M.2 Solid-State Drive

    5. Follow the procedure in after working inside your computer. M.2 solid-state drive Removing the M.2 2230 solid-state drive 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.

  • Page 26: Removing The M.2 2280 Solid-State Drive

    Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive slot. 2. Slide the solid-state drive into the solid-state drive slot on the system board. 3. Replace the (M2x3) screw to secure the solid-state drive to the system board. Next steps 1.

  • Page 27: Installing The M.2 2280 Solid-State Drive

    Steps 1. Remove the (M2x3) screw that secures the solid-state drive to the system board. 2. Slide and remove the solid-state drive from the solid-state drive slot on the system board. Installing the M.2 2280 solid-state drive 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 solid-state drive and provides a visual representation of the installation procedure.

  • Page 28: M.2 Solid-State Drive Conversion Bracket

    2. Slide the solid-state drive into the solid-state drive slot on the system board. 3. Replace the (M2x3) screw to secure the solid-state drive to the system board. Next steps 1. Install the base cover. 2. Exit the service mode 3.

  • Page 29: M.2 Solid-State Drive Conversion Plate

    Steps 1. Remove the (M2x3) screw that secures the solid-state drive conversion bracket to the solid-state drive conversion plate. 2. Depending on the type of solid-state drive (M.2 2230/ M.2 2280), turn, align and place the solid-state drive conversion bracket into the slot. 3.

  • Page 30: Installing The M.2 Solid-State Drive Conversion Plate

    About this task The following image indicates the location of the M.2 solid-state drive conversion plate and provides a visual representation of the removal procedure. NOTE: The following image is from systems shipped with discrete graphic card. The system board has a different configuration for systems shipped with integrated graphic card.

  • Page 31: Hard-Disk Drive Assembly

    Steps 1. Align and place the solid-state drive conversion plate on the system board. 2. Install the two (M2x3) screws to secure the solid-state drive conversion plate to the system board. Next steps 1. Install the SSD. 2. Install the base cover.

  • Page 32: Removing The Hard-Disk Drive Bracket

    Steps 1. Lift and disconnect the hard-disk drive cable from the connector on the system board. 2. Loosen the four (M2X4.5) screws that secure the hard-disk drive assembly to the palmrest assembly. 3. Lift and remove the hard-disk drive assembly from the slot on the palmrest assembly. Removing the hard-disk drive bracket Prerequisites 1.

  • Page 33: Installing The Hard-Disk Drive Bracket

    Steps 1. Disconnect the hard-disk drive cable from the connector on the hard-disk drive bracket. 2. Remove the four (M3x3) screws that secure the hard-disk drive to the hard-disk drive bracket. 3. Flip the hard-disk drive bracket, lift the silver foil, and remove the hard-disk drive from the hard-disk drive bracket. Installing the hard-disk drive bracket Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 34: Installing The Hard-Disk Drive Assembly

    Steps 1. Lift the silver foil, align and place the hard-disk drive in the hard-disk drive bracket. 2. Install the four (M3x3) screws to secure the hard-disk drive to the hard-disk drive bracket. 3. Connect the hard-disk drive cable to the connector on the hard-disk drive bracket. Next steps 1.

  • Page 35: Wlan Card

    Steps 1. Align and place the hard-disk drive assembly in the slot on the palmrest assembly. 2. Tighten the four (M2X4.5) screws to secure the hard-disk drive assembly to the palmrest assembly. 3. Connect the hard-disk drive cable to the connector on the system board. Next steps 1.

  • Page 36: Installing The Wlan Card

    Steps 1. Remove the screw (M2x3) that secures WLAN card bracket to the WLAN card on the system board. 2. Lift and remove the WLAN card bracket from the WLAN card that secures the two antenna cables. 3. Disconnect the antenna cables from the connectors on the WLAN card. 4.
  • Page 37 Steps 1. Connect the two antenna cables to the connectors on the WLAN card. NOTE: The antenna cable connectors are fragile and utmost care should be taken while replacing them. Table 2. Antenna cable guide Cable color Connector White cable (Main) White triangle (△) on the WLAN module of the system board Black cable (Aux) Solid triangle (▲) on the WLAN module of the system board...

  • Page 38: Wwan Card

    3. Install the SIM card tray for 4G LTE enabled systems. 4. Install the microSD-card. 5. Follow the procedure in after working inside your computer. WWAN card Removing the WWAN card Prerequisites 1. Follow the procedure in before working inside your computer.

  • Page 39: Installing The Wwan Card

    Steps 1. Open the mylar sheet that covers the WWAN card. 2. Remove the screw (M2x3) that secures WWAN card bracket to the WWAN card on the system board. 3. Lift and remove the WWAN card bracket from the WWAN card that secures the two antenna cables. 4.

  • Page 40: System Fan

    Table 3. Antenna cable guide Cable color Connector White cable (Main) White triangle (△) on the WWAN module of the system board Black cable (Aux) Solid triangle (▲) on the WWAN module of the system board 2. Align the notch on the WWAN card with the tab on the WWAN card slot. 3.

  • Page 41: Installing The System Fan

    Steps 1. Disconnect the system fan cable from the connector on the system board. 2. Remove the two (M2x3) screws that secure the system fan to the palmrest assembly. 3. Lift and remove the system fan from the palmrest assembly. Installing the system fan Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 42: Battery

    Steps 1. Align and place the system fan into the slot on the palmrest assembly. 2. Install the two (M2x3) screws to secure the system fan to the palmrest assembly. 3. Connect the system fan cable to the connector on the system board. Next steps 1.

  • Page 43: Installing The 3-Cell Battery

    Steps 1. Disconnect the battery cable from the connector on the system board. 2. Remove the three (M2X3) screws that secure the battery in place. 3. Lift and remove the battery from the palmrest assembly. 4. Slide the metal above the connector on the battery to unlock. 5.
  • Page 44 Steps 1. Connect the battery cable to the connector on the battery. 2. Slide the metal above the connector on the battery to lock. 3. Route the battery cable through the routing channel in the battery and adhere the adhesive tapes. 4.

  • Page 45: Removing The 4-Cell Battery

    Removing the 4-cell battery 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. About this task The following image indicates the location of the battery and provides a visual representation of the removal procedure. Steps 1.

  • Page 46: Installing The 4-Cell Battery

    6. Disconnect the battery cable from the connector on the battery. Installing the 4-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 battery and provides a visual representation of the installation procedure. Steps 1.

  • Page 47: I/O Cable

    6. Connect the battery cable to the connector on the system board. Next steps 1. Install the base cover. 2. Install the SIM card tray for 4G LTE enabled systems. 3. Install the microSD-card. 4. Follow the procedure in after working inside your computer.

  • Page 48: Installing The I/O Cable

    Installing the I/O cable 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 I/O cable and provides a visual representation of the installation procedure. Steps 1.
  • Page 49 2. Remove the microSD-card. 3. Remove the SIM card tray for 4G LTE enabled systems. 4. Enter the service mode. 5. Remove the base cover. 6. Remove the WLAN card. 7. Remove the WWAN card for systems enabled with 4G LTE. 8.
  • Page 50 Steps 1. Unroute the display cable from the routing guides in the palmrest assembly. 2. Peel the adhesive tape that secures the display cable in place. 3. Open the latch and disconnect the display cable from the connector on the system board. 4.

  • Page 51: Installing The Display Assembly

    Installing the display assembly Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the display assembly and provide a visual representation of the installation procedure.
  • Page 52 Steps 1. Align and place the system chassis under the hinges of the display assembly. 2. Press the left and right hinges in downward direction toward the palmrest assembly. 3. Install the (M2.5x4) and six (M2.5x6) screws to secure the display hinges to the palmrest assembly. 4.

  • Page 53: Heatsink Assembly

    Heatsink assembly Removing the heatsink assembly - for computers with discrete graphics card Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the microSD-card. 3. Remove the SIM card tray for systems enabled with 4G LTE. 4.

  • Page 54: Installing The Heatsink Assembly - For Computers With Discrete Graphics Card

    Installing the heatsink assembly - for computers with discrete graphics 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 heatsink assembly and provides a visual representation of the installation procedure.

  • Page 55: Removing The Heatsink Assembly - For Computers With Integrated Graphics Card

    Removing the heatsink assembly - for computers with integrated graphics card Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the microSD-card. 3. Remove the SIM card tray for systems enabled with 4G LTE. 4. Enter the service mode.

  • Page 56: Power Adapter Port

    About this task The following image indicates the location of the heatsink assembly and provides a visual representation of the installation procedure. Steps 1. Align and place the heatsink assembly into the slot on the system board. 2. Tighten the four captive screws (in order, 1>2>3>4) to secure the heatsink assembly to the system board. Next steps 1.

  • Page 57: Installing The Power Adapter Port

    About this task The following image indicates the location of the power adapter port and provides a visual representation of the removal procedure. Steps 1. Remove the (M2.5x4) and two (M2.5x6) screws that secure the display hinges to the system. 2.

  • Page 58: Coin-Cell Battery

    Steps 1. Align and place the power adapter port on the palmrest assembly. 2. Install the (M2x3) screw to secure the power adapter port to the palmrest assembly. 3. Connect the power adapter port to the connector on the system board. 4.

  • Page 59: Installing The Coin-Cell Battery

    Steps 1. Open the mylar sheet that covers the coin-cell battery cable. 2. Disconnect the coin-cell battery cable from the connector on the I/O board. 3. Lift and remove the coin-cell battery from the palmrest assembly. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 60: Usb Cable

    Steps 1. Align and place the coin-cell battery on the palmrest assembly. 2. Connect the coin-cell battery cable to the connector on the I/O board. 3. Close the mylar sheet to cover the coin-cell battery cable. Next steps 1. Install the WWAN card for 4G LTE enabled systems.

  • Page 61: Installing The Usb Cable

    About this task The following image indicates the location of the USB cable and provides a visual representation of the removal procedure. Steps 1. Open the latch and disconnect the USB cable from the connector on the system board. 2. Carefully peel the USB cable from the palmrest assembly. 3.

  • Page 62: Ethernet Port

    Steps 1. Connect the USB cable to the connector on the system board and close the latch. 2. Align and adhere the USB cable on the palmrest assembly. 3. Connect the USB cable to the connector on the I/O board and close the latch. Next steps 1.

  • Page 63: Installing The Ethernet Port

    Steps 1. Remove the four (M2.5x6) screws to secure the hinge bracket on the palmrest assembly. 2. Lift the hinge in upward direction away from the palmrest assembly. 3. Remove the two (M2x5) screws that secure the ethernet on the I/O board. 4.

  • Page 64: I/O Board

    Steps 1. Align and place the ethernet on the I/O board. 2. Install the two (M2x5) screws to secure the ethernet on the I/O board. 3. Press the hinge in downward direction toward the palmrest assembly. 4. Install the four (M2.5x6) screws to secure the hinge bracket on the palmrest assembly. Next steps 1.

  • Page 65: Installing The I/O Board

    Steps 1. For systems shipped with power button, peel the adhesive, open the latch and disconnect the power button cable from the connector on the I/O board. 2. Open the latch and disconnect the I/O cable from the connector on the system board. 3.

  • Page 66: Power Button

    Steps 1. Align and place the I/O board into its slot on the palmrest assembly. 2. Install the two (M2x3) screws that secure the I/O board on the palmrest assembly. 3. Connect the USB cable and coin-cell cable to the connectors on the system board. 4.

  • Page 67: Installing The Power Button Without Fingerprint Reader

    7. Remove the ethernet port. About this task The following image indicates the location of the power button without fingerprint reader and provides a visual representation of the removal procedure. Steps Lift the power button off the palmrest assembly. Installing the power button without fingerprint reader About this task The following image indicates the location of the power button without fingerprint reader and provides a visual representation of the removal procedure.

  • Page 68: Removing The Power Button With Fingerprint Reader

    Steps Align and place the power button into the slot on the palmrest assembly. Next steps 1. Install the ethernet port. 2. Install the board. 3. Install the base cover. 4. Exit the service mode 5. Install the SIM card tray for 4G LTE enabled systems.

  • Page 69: Installing The Power Button With Fingerprint Reader

    Installing the power button with fingerprint reader About this task The following image indicates the location of the power button with fingerprint reader and provides a visual representation of the removal procedure. NOTE: Steps 1. Affix the power button cable with adhesive backing. 2.
  • Page 70 6. Remove the memory module. 7. Remove the 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 Figure 1. System board connectors 1. System fan cable connector 2.
  • Page 71 The following images indicate the location of the system board and provide a visual representation of the removal procedure. Removing and installing components...

  • Page 72: Installing The System Board - For Computers With Discrete Graphics Card

    Steps 1. Remove the two (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.
  • Page 73 The following images indicate the location of the system board and provide a visual representation of the installation procedure. Removing and installing components...

  • Page 74: Removing The System Board - For Computers With Integrated Graphics Card

    Steps 1. Align and place the system board into the slot on the palmrest assembly. 2. Install the two (M2x2) screws to secure the system board in place. 3. Align and place the type-c bracket on the system board. 4. Install the two (M2x5) screws to secure the type-c bracket in place. 5.
  • Page 75 About this task Figure 3. System board connectors 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.
  • Page 76 The following images indicate the location of the system board and provide a visual representation of the removal procedure. Removing and installing components...

  • Page 77: Installing The System Board - For Computers With Integrated Graphics Card

    Steps 1. Remove the two (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.
  • Page 78 The following images indicate the location of the system board and provide a visual representation of the installation procedure. Removing and installing components...

  • Page 79: Speakers

    Steps 1. Align and place the system board into the slot on the palmrest assembly. 2. Install the two (M2x2) screws to secure the system board in place. 3. Align and place the type-c bracket on the system board. 4. Install the two (M2x5) screws to secure the type-c bracket in place. 5.

  • Page 80: Installing The Speaker

    Steps 1. Disconnect the speaker cable from the connector on the system board. 2. Unroute the speaker cable from the routing guides in the palmrest assembly. 3. Peel the adhesive tapes, lift and remove the speakers off the palmrest assembly. Installing the speaker Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 81: Touchpad

    Steps 1. Align and place the speakers into the slot on the palmrest assembly. 2. Route the speaker cable through the routing guides in the palmrest assembly. 3. Connect the speaker cable to the connector on the system board. 4. Affix the adhesive tapes to secure the speakers in place. Next steps 1.

  • Page 82: Installing The Touchpad

    Steps 1. Open the latch and disconnect the touchpad cable from the connector on the system board. 2. Peel the adhesive tapes that secure the touchpad module in place. 3. Remove the three (M2x2.5) screws that secure the touchpad bracket to the touchpad module. 4.

  • Page 83: Wwan I/O Board

    Steps 1. Align and place the touchpad module into the slot on the palmrest assembly. 2. Install the four (M2x2) screws to secure the touchpad module to the palmrest assembly. 3. Align and place the touchpad bracket on the touchpad module. 4.

  • Page 84: Installing The Wwan I/O Board

    About this task The following image indicates the location of the WWAN I/O board and provides a visual representation of the removal procedure. NOTE: The following steps are applicable only for 4G LTE enabled systems. Steps 1. Remove the two (M2x3) screws that secure the WWAN I/O board to the palmrest assembly. 2.

  • Page 85: Palmrest Assembly

    Steps 1. Connect the WWAN cable to the connector on the WWAN I/O board and close the latch. 2. Align and place the WWAN I/O board into its slot on the palmrest assembly. 3. Install the two (M2x3) screws to secure the WWAN I/O board to the palmrest assembly. Next steps 1.

  • Page 86: Installing The Palmrest Assembly

    14. Remove the display assembly. 15. Remove the system fan. 16. Remove the heatsink assembly. 17. Remove the power adapter port. 18. Remove the board. 19. Remove the coin-cell battery. 20. Remove the cable. 21. Remove the WWAN I/O board for systems enabled with 4G LTE.
  • Page 87 Steps After performing the succeeding steps, you are left with the palmrest assembly. Next steps 1. Install the system board. 2. Install the WWAN I/O board for systems enabled with 4G LTE. 3. Install the cable. 4. Install the coin-cell battery.

  • Page 88: Display Bezel

    Display bezel Removing the display bezel 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. Enter the service mode. 5. Remove the base cover.

  • Page 89: Installing The Display Bezel

    Installing the display bezel 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 bezel and provides a visual representation of the installation procedure. Steps Align the display bezel with the display assembly.

  • Page 90: Display Panel

    Display panel Removing the display panel Prerequisites 1. Follow the procedure in before working inside your computer. 2. Enter the service mode. 3. Remove the microSD-card. 4. Remove the SIM card tray for 4G LTE enabled systems. 5. Remove the base cover.
  • Page 91 Removing and installing components...
  • Page 92 Removing and installing components...

  • Page 93: Installing The Display Panel

    Steps 1. Remove the six (M2.5x2.5) and two (M2.5x3) screws that secure the left and right hinge brackets in place. 2. Gently flip over the display panel. 3. Peel the adhesive tape, open the latch and disconnect the display cable from the connector on the display panel. 4.
  • Page 94 Removing and installing components...
  • Page 95 Steps 1. Align and place the display panel on the display assembly. 2. Connect the display cable to the connector on the display panel, close the latch and affix the adhesive tape. 3. Install the six (M2.5x2.5) and two (M2.5x3) screws to secure the left and right hinge brackets in place. 4.

  • Page 96: Camera

    Camera Removing the camera 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. Enter the service mode. 5. Remove the base cover. 6.

  • Page 97: Display Cable

    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 98: Installing The Display Cable

    8. Remove the I/O board cable. 9. Remove the display assembly. 10. Remove the display bezel. 11. Remove the display panel. About this task The following image indicates the location of the display cable and provides a visual representation of the removal procedure. Steps 1.
  • Page 99 About this task The following image indicates the location of the display cable and provides a visual representation of the installation procedure. Steps 1. Connect the display cable from the connector on the camera module. 2. Connect the display cable from the connector on the display panel. 3.

  • Page 100: Display Back-Cover

    Display back-cover Removing the display back-cover 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. Enter the service mode. 5. Remove the base cover.
  • Page 101 About this task The following image indicates the location of the display back-cover and provides a visual representation of the installation procedure. Steps After performing the succeeding steps, you are left with the base cover assembly. Next steps 1. Install the display cable.

  • Page 102: Chapter 3: Drivers And Downloads

    Drivers and downloads When troubleshooting, downloading, or installing drivers, it is recommended that you read the Dell knowledge base article, Drivers and Downloads FAQs Drivers and downloads...

  • Page 103: Chapter 4: Bios Setup

    BIOS 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: Depending on the computer and its installed devices, the items listed in this section may or may not be displayed. NOTE: Before you change BIOS Setup program, it is recommended that you write down the BIOS Setup program screen information for future reference.

  • Page 104: One Time Boot Menu

    Depending on your system and its installed devices, the items that are listed in this section may or may not appear. Table 5. System setup options—System information menu Overview Latitude 3520 BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the system.
  • Page 105 Table 5. System setup options—System information menu (continued) Overview Maximum Clock Speed Displays the maximum processor clock speed. Minimum Clock Speed Displays the minimum processor clock speed. Current Clock Speed Displays the current processor clock speed. Core Count Displays the number of cores on the processor. Processor ID Displays the processor identification code.
  • Page 106 Table 6. System setup options—Boot Configuration menu (continued) Boot Configuration By default, the Secure Digital (SD) Card Boot option is not enabled. Secure Boot Enable Secure Boot Enable or disable the secure boot feature. By default, the option is disabled. Secure Boot Mode Allows you to modify the secure boot mode options.
  • Page 107 Table 8. System setup options—Storage menu (continued) Storage Storage interface Port Enablement This page allows you to enable the onboard drives. By default, the SATA-1 option is enabled. By default, the M.2 PCIe SSD-1 option is enabled. SMART Reporting Enable SMART Reporting Enable or disable Self-Monitoring, Analysis, and Reporting Technology (SMART) during system startup.
  • Page 108 Table 10. System setup options—Connection menu (continued) Connection Integrated NIC If enabled, UEFI network protocols are installed and available, allowing pre-OS and early OS networking features to use any enabled NICs. The option Enable with PXE is enabled by default. Wireless Device Enable WWAN/GPS (For systems with discrete Enable or disable the internal WWAN/GPS device.
  • Page 109 Enables USB wake support. By default, the Enable USB Wake Support option is disabled. Wake on Dell USB-C Dock When enabled, connecting a Dell USB-C Dock will wake the system from standby. By default, the Wake on Dell USB-C Dock option is enabled.
  • Page 110 Table 12. System setup options—Security menu (continued) Security By default, the option is enabled. SMM Security Mitigation Enable or disable SMM Security Mitigation. By default, the option is enabled. Data Wipe on Next Boot Start Data Wipe Enable or disable the data wipe on next boot. By default, the option is disabled.
  • Page 111 Dell Auto operating system Recovery Controls the automatic boot flow for SupportAssist System Resolution Console Threshold and for Dell operating system Recovery Tool. By default, the threshold value is set to 2. Table 15. System setup options—System Management menu System Management Service Tag Display the Service Tag of the system.
  • Page 112 Table 15. System setup options—System Management menu (continued) System Management Auto on Time Enable to set the system to turn on automatically every day or on a preselected date and time. This option can be configured only if the Auto On Time is set to Everyday, Weekdays, or Selected Days.
  • Page 113 Table 18. System setup options—Virtualization menu (continued) Virtualization By default, the option is enabled. VT for Direct I/O Specify whether a Virtual Machine Monitor (VMM) can use the additional hardware capabilities that are provided by Intel Virtualization Technology for Direct I/O. By default, the option is enabled.

  • Page 114: Updating The Bios

    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 115: Updating The Bios From The F12 One-Time Boot Menu

    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 116: Assigning A System Setup Password

    CAUTION: The password features provide a basic level of security for the data on your computer. CAUTION: Anyone can access the data that is stored on your computer if it is not locked and left unattended. NOTE: System and setup password feature is disabled. Assigning a system setup password Prerequisites You can assign a new System or Admin Password only when the status is in Not Set.

  • Page 117: Clearing Cmos Settings

    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 118: 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 119: Running The Supportassist Pre-Boot System Performance Check

    Running the SupportAssist Pre-Boot System Performance Check Steps 1. Turn on your computer. 2. As the computer boots, press the F12 key as the Dell logo appears. 3. On the boot menu screen, select the Diagnostics option. 4. Click the arrow at the bottom left corner.

  • Page 120: 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 121 (AC, battery, coin cell) and errors drain flea power by pressing and holding down power button for 3~5 seconds. CPU failure ● Run the Dell Support Assist/Dell Diagnostics tool. ● If problem persists, replace the system board. System board failure (included ●...

  • Page 122: 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 123: 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 000130881 www.dell.com/support. Troubleshooting...

  • Page 124: Chapter 6: Getting Help And Contacting Dell

    Getting help and contacting Dell Self-help resources You can get information and help on Dell products and services using these self-help resources: Table 24. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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