Dell Latitude 3120 Service Manual
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Dell Latitude 3120 Service Manual

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Latitude 3120
Service Manual
Regulatory Model: P32T/P33T
Regulatory Type: P32T001/P33T001
April 2021
Rev. A01

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Summary of Contents for Dell Latitude 3120

  • Page 1 Latitude 3120 Service Manual Regulatory Model: P32T/P33T Regulatory Type: P32T001/P33T001 April 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 inside your computer..................6 Safety instructions................................6 Before working inside your computer........................6 Safety precautions.................................7 Electrostatic discharge—ESD protection........................7 ESD field service kit ..............................8 After working inside your computer..........................9 Chapter 2: Removing and installing components................10 Recommended tools................................10 Screw List....................................
  • Page 4 Installing the heatsink assembly..........................38 Dummy battery cell................................39 Removing the dummy battery cell...........................39 Installing the dummy battery cell..........................40 System board..................................41 Removing the system board............................41 Installing the system board............................43 Touch-panel assembly..............................46 Removing the touch-panel assembly........................46 Installing the touch-panel assembly........................48 Display bezel..................................
  • Page 5 Diagnostic error messages.............................. 84 System error messages..............................87 Recovering the operating system..........................87 Real-Time Clock (RTC Reset)............................88 Flashing the BIOS................................88 Backup media and recovery options..........................88 WiFi power cycle................................88 Flea power release................................89 Chapter 6: Getting help and contacting Dell................90 Contents...

  • Page 6: 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 7: Safety Precautions

    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 8: Esd Field Service Kit

    Always place parts in your hand, on the ESD mat, in the system, or inside an anti-static bag. ● Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport. Working inside your computer...

  • Page 9: After Working Inside Your Computer

    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 10: 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 require the following tools: ● Phillips #0 screwdriver ● Phillips #1 screwdriver ●...
  • Page 11 Table 1. Screw list (continued) Component Screw type Quantity Image Display bracket M2x3 Solid-state drive bracket M2x3 Display hinge bracket (Latitude 3120 2-in-1) M2.5x2.5 M2x2 Display hinge bracket M2.5x5 N-lock M2x4 display hinge bracket (Latitude 3120) M2.5x2.5 M2x2.5 Display panel (Latitude 3120) M2x2.5...

  • Page 12: Major Components Of Your System

    Major components of your system 1. Display assembly Removing and installing components...

  • Page 13: Palmrest And Keyboard Assembly

    14. World-facing camera 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 14 Removing and installing components...

  • Page 15: Installing The Palmrest And Keyboard

    Steps 1. Loosen the nine captive screws that secure the palmrest assembly to the computer chassis. 2. Place the system on a flat surface with the keyboard facing up. Open the system to 180 degrees. NOTE: The system will automatically power on when it is opened past 5-degree angle. Press the power button to turn off the system and then proceed with the disassembly process.
  • Page 16 Removing and installing components...

  • Page 17: Solid-State Drive

    Steps 1. Connect the battery cable, keyboard Flexible Printed Circuits (FPC), and touchpad Flexible Flat Cable (FFC) to the system board. 2. Place the palmrest assembly and the keyboard on the computer chassis. 3. Align and place the base cover on the computer, and snap the base cover latches into place. 4.

  • Page 18: Installing The Solid-State Drive

    The following images indicate the location of the SSD and provide a visual representation of the removal procedure. Steps 1. Remove the single screw (M2x3) that secures the SSD thermal plate and remove the thermal plate from the SSD. 2. Slide and remove the SSD from the M.2 card slot on the system board. Installing the solid-state drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 19: Speakers

    Steps 1. Align the notch on the SSD with the tab on the M.2 card slot and slide the SSD into the slot on the system board. 2. Replace the SSD thermal plate, press to fit it firmly to cover the SSD. 3.

  • Page 20: Installing The Speaker

    Steps 1. Disconnect the speaker cable from the connector on the system board. 2. Remove the adhesive tapes that secure the speaker cable to the system board. 3. Unroute the speaker cable from the routing channel. 4. Lift and remove the speakers from their slots on the computer chassis. Installing the speaker Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 21: Coin-Cell Battery

    Steps 1. Using the alignment posts and rubber grommets, replace the speaker into the slots on the computer chassis. 2. Route the speaker cable through the routing channel. 3. Affix the adhesive tapes to secure the speaker cable on the system board. 4.

  • Page 22: Installing The Coin-Cell Battery

    About this task The following image indicates the location of the coin-cell battery and provides a visual representation of the removal procedure. Steps 1. Disconnect the coin cell battery cable from the connector on the system board. 2. Pry the coin cell battery to release it from the adhesive. Lift and remove it from the computer chassis. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 23: Audio Board

    Steps 1. Place the coin cell battery into the slot on the computer chassis. 2. Connect the coin cell battery cable to the connector on the system board. Next steps 1. Install the palmrest and keyboard assembly. 2. Follow the procedure in after working inside your computer.

  • Page 24: Installing The Audio Board

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

  • Page 25: 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 26: Installing The 3-Cell Battery

    Steps 1. Peel off the adhesive tapes that secure the 3-cell battery to the computer chassis. 2. Unroute the battery cable from the routing channels between the system board and 3-cell battery. 3. Remove the four screws (M2x3) that secure the 3-cell battery to the computer chassis. 4.

  • Page 27: Removing The 4-Cell Battery

    Steps 1. Align and replace the 3-cell battery into the computer chassis. 2. Route the battery cable through the routing channels between the system board and 3-cell battery. 3. Affix the adhesive tapes to secure the 3-cell battery to the computer chassis. 4.

  • Page 28: Installing The 4-Cell Battery

    Steps 1. Peel off the adhesive tapes that secure the 4-cell battery to the computer chassis. 2. Unroute the battery cable from the routing channels between the system board and 4-cell battery. 3. Remove the five screws (M2x3) that secure the 4-cell battery to the computer chassis. 4.

  • Page 29: Display Assembly

    Steps 1. Align and replace the 4-cell battery into the computer chassis. 2. Route the battery cable through the routing channels between the system board and 4-cell battery. 3. Affix the adhesive tapes to secure the 4-cell battery to the computer chassis. 4.
  • Page 30 Removing and installing components...

  • Page 31: Installing The Display Assembly

    Steps 1. Remove the singe screw (M2x3) that secures the WLAN antenna cable bracket to the system board. 2. Lift and remove the WLAN antenna cable bracket from the system board. 3. Disconnect the two antenna cables that are connected to the WLAN module on the system board. 4.
  • Page 32 Removing and installing components...

  • Page 33: Power-Adapter Port

    Steps 1. Align and place the display assembly on the computer chassis. 2. Replace the single (M2x4) screw and six (M2.5x5) screws that secure the display assembly to the computer chassis. 3. For 2-in-1 systems, connect the touch cable to the connector on the system board. 4.

  • Page 34: 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. Disconnect the power-adapter port cable from the system board. 2. Remove the two screws (M2x4) that secure the power-adapter port to the computer chassis. 3.

  • Page 35: World-Facing Camera

    World-facing camera Removing the world-facing camera Prerequisites NOTE: The following world-facing camera removal procedure is applicable for Latitude 3120 2-in-1 only. CAUTION: This is a fragile component. Handle with care. 1. Follow the procedure in before working inside your computer.

  • Page 36: Installing The World-Facing Camera

    4. Lift and remove the world-facing camera module from the computer chassis. Installing the world-facing camera Prerequisites NOTE: The following world-facing camera installing procedure is applicable for Latitude 3120 2-in-1 only. CAUTION: This is a fragile component. Handle with care. About this task The following image indicates the location of the front-facing camera and provides a visual representation of the installation procedure.

  • Page 37: Heatsink Assembly

    Steps 1. Insert the world-facing camera module into the slot on the computer chassis. 2. Replace the single screw (M2.5x2.5) to secure the front-facing camera module to the computer chassis. 3. Connect the world-facing camera cable to the connector on the camera module. Next steps 1.

  • Page 38: Installing The Heatsink Assembly

    Steps 1. For systems shipped with an SSD: Remove the single screw (M2x3) that secures the SSD thermal plate to the system board. Remove the thermal plate from the system board. 2. Remove the four screws (M2x3) that secure the heatsink assembly to the system board. 3.

  • Page 39: Dummy Battery Cell

    Steps 1. Align and replace the heatsink assembly into its slot on the system board. 2. Replace the four screws (M2x3) to secure the heatsink assembly to the system board. 3. For systems shipped with an SSD: Align and replace the single screw (M2x3) that secures the SSD thermal plate to the system board.

  • Page 40: Installing The Dummy Battery Cell

    About this task NOTE: The following steps are for the systems that are shipped with a 3-cell battery. The following image indicates the location of the dummy battery cell and provides a visual representation of the removal procedure. Steps 1. Peel off the adhesive tapes that secure the battery cable to the dummy battery cell. 2.

  • Page 41: System Board

    Steps 1. Align and place the dummy battery cell into the computer chassis. 2. Affix the adhesive tapes to secure the dummy battery cell to the system board. 3. Replace the two screws (M2x3) to secure the dummy battery cell in place. 4.
  • Page 42 Removing and installing components...

  • Page 43: Installing The System Board

    Steps 1. Remove the singe screw (M2x3) that secures the WLAN antenna cable bracket to the system board. 2. Lift and remove the WLAN antenna cable bracket from the system board. 3. Disconnect the two antenna cables that are connected to the WLAN module on the system board. 4.
  • Page 44 Removing and installing components...
  • Page 45 Steps 1. Replace the system board into the computer chassis. 2. For systems that are shipped with a USB Type-C port, replace the four screws (M2x3) that secure the system board to the computer chassis. 3. For systems that are not shipped with a USB Type-C port, replace the six screws (M2x3) that secure the system board to the computer chassis.

  • Page 46: Touch-Panel Assembly

    4. Install the palmrest and keyboard assembly. 5. Follow the procedure in after working inside your computer. Touch-panel assembly Removing the touch-panel assembly Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the palmrest and keyboard assembly.
  • Page 47 Steps 1. Place the display assembly on a flat surface. Open the display hinge caps to 90 degrees and open the display hinges to 180 degrees. 2. Open the display hinge caps to 180 degrees and place the display hinges over the edge of the table. 3.

  • Page 48: Installing The Touch-Panel Assembly

    Installing the touch-panel assembly Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task NOTE: The following steps are for 2-in-1 systems. The following image indicates the location of the touch panel assembly and provides a visual representation of the installation procedure.

  • Page 49: Display Bezel

    3. Follow the procedure in after working inside your computer. Display bezel Removing the display bezel Prerequisites NOTE: The following steps are for Latitude 3120 systems. 1. Follow the procedure in before working inside your computer. 2. Remove the palmrest and keyboard assembly.
  • Page 50 Removing and installing components...

  • Page 51: Installing The Display Bezel

    If you are replacing a component, remove the existing component before performing the installation procedure. About this task NOTE: The following steps are for Latitude 3120 systems. The following images indicate the location of the display bezel and provide a visual representation of the installation procedure. Removing and installing components...

  • Page 52: Display Panel

    3. Follow the procedure in after working inside your computer. Display panel Removing the display panel Prerequisites NOTE: The following steps are for Latitude 3120 systems. 1. Follow the procedure in before working inside your computer. 2. Remove the palmrest and keyboard assembly.
  • Page 53 4. Remove the display bezel. About this task The following images indicate the location of the display panel and provide a visual representation of the removal procedure. Removing and installing components...

  • Page 54: Installing The Display Panel

    If you are replacing a component, remove the existing component before performing the installation procedure. About this task NOTE: The following steps are for Latitude 3120 systems. The following images indicate the location of the display panel and provide a visual representation of the installation procedure. Removing and installing components...
  • Page 55 Removing and installing components...

  • Page 56: Front Facing Camera

    Steps 1. Connect the display cable on the connector on the display panel. 2. Affix the rubber sticker on the display cable connector. 3. Affix the mylar tape to secure the display cable on the rear of the display panel. 4.

  • Page 57: Installing The Front Facing Camera

    3. Remove the display assembly. 4. Remove the display bezel. 5. Remove the display panel. About this task The following image indicates the location of the front-facing camera, and provides a visual representation of the removal procedure. Steps 1. Peel off the adhesive tape that secures the display connector to the front-facing camera module. 2.

  • Page 58: Display Cable

    Steps 1. Insert the front-facing camera module into the slot on the display cover. 2. Connect the display cable to the front-facing camera module. 3. Affix the adhesive tape to secure the display connector on the front-facing camera module. Next steps 1.

  • Page 59: Installing The Display Cable

    Steps 1. Peel off the tape that secures the display connector on the front-facing camera module. 2. Disconnect the display cable to the front-facing camera module. 3. Peel off the tape from the left hinge that secures the display cable. 4.

  • Page 60: Display Hinges

    Steps 1. Align and affix the display cable on the display cover. 2. Route the display cable through the routing channel on the bottom-left side of the display cover. 3. Affix the tape from the left hinge to secure the display cable. 4.

  • Page 61: Installing The Display Hinge

    3. For Latitude 3120, remove the two (M2x2.5) screws and four (M2.5x2.5) screws that secure the display hinges to the display assembly. 4. For Latitude 3120 2-in-1, remove the six (M2.5x2.5) screws and four (M2x2) screws that secure the display hinges to the display assembly.
  • Page 62 Steps 1. Align and place the display hinges on the display assembly. 2. For Latitude 3120, replace the two (M2x2.5) screws and four (M2.5x2.5) screws to secure the display hinges to the display assembly. 3. For Latitude 3120 2-in-1, replace the six (M2.5x2.5) screws and four (M2x2) screws to secure the display hinges to the display assembly.

  • Page 63: Display Back Cover Assembly

    Display back cover assembly Display back cover assembly Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the palmrest and keyboard assembly. 3. Remove the display assembly. 4. Remove the display bezel. 5. Remove the display panel.

  • Page 64: Base Cover Assembly

    Next steps 1. Install the display hinges. 2. Install the display cable. 3. Install the front-facing camera. 4. For 2-in-1 systems, install the touch-panel assembly 5. Install the display panel. 6. Install the display bezel. 7. Install the display assembly. 8.
  • Page 65 Next steps 1. Install the system board. 2. For systems that are shipped with a 3-cell battery, install the dummy battery cell. 3. Install the heatsink assembly. 4. For systems shipped with a world-facing camera, install the world-facing camera. 5. Install the power adapter port.

  • Page 66: Chapter 3: Drivers And Downloads

    This chapter details the supported operating systems along with instructions on how to install the drivers. Prerequisites When troubleshooting, downloading or installing drivers it is recommended that you read the Dell Knowledge Based article, Drivers and Downloads FAQ SLN128938. Steps 1.

  • Page 67: Chapter 4: System Setup

    Boot menu To initiate a one-time boot menu with a list of the valid boot devices for the system, press <F12> when the Dell logo is displayed. Diagnostics and BIOS Setup options are also in this menu. The devices that are listed on the boot menu depend on the bootable devices in the system.

  • Page 68: Navigation Keys

    The boot sequence screen also displays the option to access the System Setup screen. Navigation keys NOTE: For most of the System Setup options, changes that you make are recorded but do not take effect until you restart the system. Keys Navigation Up arrow...

  • Page 69: System Information

    Table 2. General (continued) Option Description UEFI Boot Path Security This option controls whether or not the system will prompt the user to enter the Admin password when booting a UEFI boot path from the F12 Boot Menu. ● Always, Except Internal HDD (enabled by default) ●...

  • Page 70: Video

    Table 3. System Configuration (continued) Option Description ● Enable User-Facing Camera (enabled by default) ● Enable World-Facing Camera (enabled by default) MAC Address Pass-Through The feature replaces the external NIC MAC address (in a supported dock or dongle) with the selected MAC address from the system.

  • Page 71: Secure Boot

    Table 5. Security (continued) Option Description UEFI Capsule Firmware This option controls whether this system allows BIOS updates via UEFI capsule update Updates packages. The Enable UEFI Capsule Firmware Updates option is selected by default. NOTE: Disabling this option will block BIOS updates from services such as Microsoft Windows Update and Linux Vendor Firmware Service (LVFS) PTT Security ●...

  • Page 72: Performance

    Table 6. Secure Boot (continued) Option Description ● dbx If you enable the Custom Mode, the relevant options for PK, KEK, db, and dbx appear. The options are: ● Save to File- Saves the key to a user-selected file ● Replace from File- Replaces the current key with a key from a user-selected file ●...

  • Page 73: Power Management

    Standby, the system setup removes power from all the USB ports to conserve battery power. ● Wake on Dell USB-C Dock (enabled by default) — allows the system to automatically wake up when connecting to a Dell USB-C dock.

  • Page 74: Post Behavior

    ● Standard (disabled by default) — fully charges your battery at a standard rate. ● ExpressCharge (disabled by default) — the battery charges over a shorter time using Dell’s fast charging technology. ● Primarily AC use (disabled by default) — Extends battery lifespan for users who primarily operate their system while plugged into an external power source.
  • Page 75 Table 9. POST behavior (continued) Option Description The Enable Adapter Warnings option is enabled by default. USB-C Warnings Allows you to choose one of the following two methods to enable the keypad that is embedded in the internal keyboard. The Enable Dock Warning Messages option is enabled by default.

  • Page 76: Virtualization Support

    Table 9. POST behavior (continued) Option Description ● Continue on warnings (disabled by default) ● Continue on warnings and errors (disabled by default) NOTE: The errors deemed critical to the operation of the system hardware will always halt the system. Virtualization support Table 10.

  • Page 77: System Logs

    Table 14. SupportAssist System Resolution Option Description Auto OS Recovery Threshold Allows you to control the automatic boot flow for SupportAssist System Resolution Console and for Dell OS Recovery Tool. The options are: ● Off ● 1 ● 2 (Enabled by default) ●...

  • Page 78: Updating The Bios In Windows

    If BitLocker is enabled, it must be suspended before updating the system BIOS, and then re-enabled after the BIOS update is completed. Steps 1. Restart the computer. 2. Go to www.dell.com/support. ● Enter the Service Tag or Express Service Code and click Search. ● Click Drivers & Downloads. ● Click Detect Drivers and follow the on-screen instructions.

  • Page 79: System And Setup Password

    3. Insert the USB flash drive into the computer that requires the BIOS update. 4. Restart the computer and press F12 when the Dell logo appears to display the One Time Boot Menu. 5. Using arrow keys, select USB Storage Device and press Enter.

  • Page 80: Deleting Or Changing An Existing System Setup Password

    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 81: Chapter 5: Troubleshooting

    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 82: 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 83 (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 84: Diagnostic Error Messages

    HECI message. NOTE: Blinking 3-3-3 LEDs on Lock LED (Caps-Lock or Nums-Lock), Power button LED (without Fingerprint reader), and Diagnostic LED indicates failure to provide input during LCD panel test on Dell SupportAssist Pre-boot System Performance Check diagnostics. Diagnostic error messages Table 18.
  • Page 85 Then, shut down the computer, reinstall the hard drive, and restart the computer. If the problem persists, try another drive. Run the Hard Disk Drive tests in Dell Diagnostics. INSERT BOOTABLE MEDIA The operating system is trying to boot to non-bootable media, such as an optical drive.
  • Page 86 The operating system cannot find a specific track on the hard drive. SHUTDOWN FAILURE A chip on the system board may be malfunctioning. Run the System Set tests in Dell Diagnostics. If the message reappears, Contact Dell. TIME-OF-DAY CLOCK LOST POWER System configuration settings are corrupted. Connect your computer to an electrical outlet to charge the battery.

  • Page 87: System Error Messages

    Recovering the operating system When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell SupportAssist OS Recovery. Troubleshooting...

  • Page 88: Real-Time Clock (Rtc Reset)

    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 89: Flea Power Release

    Steps 1. Turn off your computer. 2. Turn off the modem. 3. Turn off the wireless router. 4. Wait for 30 seconds. 5. Turn on the wireless router. 6. Turn on the modem. 7. Turn on your computer. Flea power release About this task Flea power is the residual static electricity that remains on the computer even after it has been powered off and the battery has been removed.

  • Page 90: 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 20. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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