Dell Inspiron 14 7420 2-in-1 Service Manual
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Dell Inspiron 14 7420 2-in-1 Service Manual

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Inspiron 14 7420 2-in-1
Service Manual
Regulatory Model: P161G
Regulatory Type: P161G001
March 2022
Rev. A00

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Summary of Contents for Dell Inspiron 14 7420 2-in-1

  • Page 1 Inspiron 14 7420 2-in-1 Service Manual Regulatory Model: P161G Regulatory Type: P161G001 March 2022 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2022 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..................5 Before working inside your computer..........................5 Safety instructions................................5 Electrostatic discharge—ESD protection........................6 ESD field service kit ................................7 Transporting sensitive components..........................8 After working inside your computer..........................8 Chapter 2: Removing and installing components................9 Recommended tools................................
  • Page 4 Updating the BIOS from the F12 One-Time boot menu..................70 Chapter 5: Troubleshooting......................72 Handling swollen Lithium-ion batteries........................72 Locate the Service Tag or Express Service Code of your Dell computer ..........72 System diagnostic lights..............................73 SupportAssist diagnostics............................... 74 Built-in self-test (BIST)..............................74 Recovering the operating system..........................74...

  • Page 5: Chapter 1: Working Inside Your Computer

    Ensure that your computer is shut down and the AC adapter is disconnected. a. Hold <B> key on the keyboard and press the power button for 3 seconds or until the Dell logo appears on the screen. b. Press any key to continue.

  • Page 6: 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 7: Esd Field Service Kit

    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 8: Transporting Sensitive Components

    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. After working inside your computer About this task CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer.

  • Page 9: 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 screwdrivers #0 ● Plastic scribe Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and...

  • Page 10: Major Components Of Inspiron 7420 2-In-1

    Table 1. Screw list (continued) Component Screw type Quantity Screw image M2x3 I/O board M2x3 Display hinges M2.5x4 Power-button/Power- M2x3 button with fingerprint reader USB Type-C bracket M2x4 System board M2x2 Major components of Inspiron 7420 2-in-1 The following image shows the major components of Inspiron 7420 2-in-1. Removing and installing components...
  • Page 11 1. Base cover 2. USB Type-C bracket 3. System board 4. I/O-board cable 5. Speakers 6. Battery 7. Touchpad-bracket 8. Memory 9. Palm-rest and keyboard assembly 10. Display assembly Removing and installing components...

  • Page 12: Base Cover

    18. I/O 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 13 Removing and installing components...

  • Page 14: Installing The Base Cover

    Steps 1. Remove the four screws (M2x4) that secure the base cover to the palm-rest and keyboard assembly. 2. Loosen the three captive screws that secure the base cover to the palm-rest and keyboard assembly. NOTE: Upon loosening the captive screws, the base cover will open up creating a gap between the base cover and the palm-rest assembly at the hinges.
  • Page 15 Removing and installing components...

  • Page 16: Battery

    Steps 1. Connect the battery cable to the connector on the system board and adhere the tape that secures the battery cable to the battery. 2. 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.

  • Page 17: Removing The 3-Cell Battery (41 Wh)

    ● 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 18: Installing The 3-Cell Battery (41 Wh)

    Installing the 3-cell battery (41 Wh) 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 19: Installing The 4-Cell Battery (54 Wh)

    Steps 1. Peel the tape that secures the battery cable to the system board, if applicable. 2. Disconnect the battery cable from the system board, if applicable. 3. Remove the five screws (M2x3) that secure the battery to the palm-rest and keyboard assembly. 4.

  • Page 20: Coin-Cell Battery

    Steps 1. Using the alignment posts, place the battery on the palm-rest and keyboard assembly. 2. Replace the five screws (M2x3) that secure the battery to the palm-rest and keyboard assembly. 3. Connect the battery cable to the system board. 4.

  • Page 21: Installing The Coin-Cell Battery

    Steps 1. Disconnect the coin-cell battery from the I/O board. 2. Peel the coin-cell battery and lift it off the slot on the palm-rest and keyboard 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 22: Memory

    Steps 1. Adhere the coin-cell battery to the slot on the palm-rest and keyboard assembly. 2. Connect the coin-cell battery cable to the I/O board. Next steps 1. Install the base cover. 2. Follow the procedure in After working inside your computer.

  • Page 23: Installing The Memory

    Steps 1. Lift the Mylar to access the memory. 2. Use your fingertips to carefully spread apart the securing-clips on each end of the memory slot until the memory module pops up. 3. Slide and remove the memory module from the memory slot. NOTE: Repeat step 1 to step 3 to remove any other memory module installed in your computer.
  • Page 24 Steps 1. Lift the Mylar to access the memory slot. 2. Align the notch on the memory module with the tab on the memory slot. 3. Slide the memory module firmly at an angle, into the memory slot. 4. Press the memory module down until it clicks into place. NOTE: If you do not hear the click, remove the memory module and reinstall it.

  • Page 25: Wireless Card

    Wireless card Removing the wireless card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. About this task The following image indicates the location of the wireless card and provides a visual representation of the removal procedure. Steps 1.
  • Page 26 About this task The following image indicates the location of the wireless card and provides a visual representation of the installation procedure. 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.

  • Page 27: Solid-State Drive

    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 base cover. About this task NOTE: The M.2 card installed on your computer will depend on the configuration ordered. Supported card configurations on the M.2 card slot: ●...

  • Page 28: Installing The M.2 2230 Solid-State Drive

    Steps 1. Remove the screw (M2x3) that secures the M.2 2230 mounting bracket to the palmrest and keyboard assembly. 2. Slide and lift the M.2 2230 solid-state drive and its mounting bracket from the M.2 card slot on the system board. 3.

  • Page 29: Removing The M.2 2280 Solid-State Drive

    Steps 1. Align the notch on the M.2 2230 solid-state to the mounting bracket. 2. Replace the screw (M2x2) that secures the M.2 2230 solid-state drive to the mounting bracket. 3. Flip over the M.2 2230 solid-state drive and mounting bracket. 4.

  • Page 30: Installing The M.2 2280 Solid-State Drive

    About this task NOTE: The M.2 card installed on your computer will depend on the configuration ordered. Supported card configurations on the M.2 card slot: ● M.2 2230 solid-state drive + 2230 mounting bracket ● M.2 2280 solid-state drive The following image indicates the location of the M.2 2280 solid-state drive and provides a visual representation of the removal procedure.

  • Page 31: Speakers

    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 M.2 card slot on the system board. 3. Replace the screw (M2x3) that secures the solid-state drive to the palm-rest and keyboard assembly. Next steps 1.

  • Page 32: Installing The Speakers

    Steps 1. Peel the tape securing the antenna cables to the palm-rest and keyboard assembly and move the antenna cables off the speaker cable. 2. Disconnect the speaker cable from the system board. 3. Peel the tapes that secure the speaker cable to the palm-rest and keyboard assembly. 4.

  • Page 33: Heat Sink

    Steps 1. Using the alignment posts and rubber grommets, place the speakers on the slots of the palm-rest and keyboard assembly. 2. Route the speaker cable through the routing guides on the palm-rest and keyboard assembly. 3. Adhere the tapes that secure the speaker cable to the palm-rest and keyboard assembly. 4.

  • Page 34: Installing The Heat Sink Without Discrete Graphics

    NOTE: This procedure applies only for computers shipped without a discrete graphics processor. The following image indicates the location of the heat sink and provides a visual representation of the removal procedure. Steps 1. In reverse sequential order, loosen the four (4>3>2>1) captive screws that secure the heat sink to the system board. 2.

  • Page 35: Removing The Heat Sink With Discrete Graphics

    Steps 1. Align the screw holes on the heat sink with the screw holes on the system board. 2. In sequential order, tighten the four (1>2>3>4) captive screws that secure the heat sink to the system board. Next steps 1. Install the base cover.

  • Page 36: Installing The Heat Sink With Discrete Graphics

    Steps 1. In reverse sequential order, loosen the seven (7>6>5>4>3>2>1) captive screws that secure the heat sink to the system board. 2. Lift the heat sink off the system board. Installing the heat sink with discrete graphics Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task CAUTION: Incorrect alignment of the heat sink can damage the system board and processor.

  • Page 37: Display Assembly

    Steps 1. Align the screw holes on the heat sink with the screw holes on the system board. 2. In sequential order, tighten the seven (1>2>3>4>5>6>7) captive screws that secure the heat sink to the system board. Next steps 1. Install the base cover.
  • Page 38 Removing and installing components...

  • Page 39: Installing The Display Assembly

    Steps 1. Peel the tape that secures the display-cable connector latch to the system board. 2. Open the latch, and disconnect the display cable from the system board. 3. Remove the two screws (M2.5x4) that secure the left-display hinge to the palm-rest and keyboard assembly. 4.
  • Page 40 Removing and installing components...
  • Page 41 Steps 1. Place the display assembly on a clean and flat surface with the display panel facing up. 2. Gently place the palm-rest and keyboard assembly under the display hinges. CAUTION: To avoid damaging the display, do not slide the palm-rest and keyboard assembly over the display assembly.

  • Page 42: Fan

    Removing the fan Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. About this task The following image indicates the location of the fan and provides a visual representation of the removal procedure. Steps 1.

  • Page 43: I/O Board

    Steps 1. Using the alignment posts, place the fan on the palm-rest and keyboard assembly. 2. Remove the two screws (M2x3) that secure the fan to the palm-rest and keyboard assembly. 3. Connect the fan cable to the system board. Next steps 1.

  • Page 44: Installing The I/O Board

    Steps 1. Remove the two screws (M2.5x4) that secure the left-display hinge to the I/O board. 2. Pry open the left-display hinge at an angle of 90 degrees. 3. Peel the tape that secures the I/O board-connector latch to the I/O board. 4.

  • Page 45: Power-Button

    Steps 1. Align the ports on the I/O board to the slots on the palm-rest and keyboard assembly. 2. Place the I/O board on the palm-rest and keyboard assembly. 3. Align the screw hole on the I/O board to the screw hole on the palm-rest and keyboard assembly. 4.

  • Page 46: Installing The Power-Button

    5. Remove the board. About this task NOTE: This procedure is applicable only for computers that are shipped without the optional fingerprint reader. The following image indicates the location of the power-button and provides a visual representation of the removal procedure. Steps 1.

  • Page 47: Removing The Power-Button With Fingerprint Reader

    Steps 1. Align the screw holes on the power-button with the screw holes on the palm-rest and keyboard assembly. 2. Replace the two screws (M2x3) that secure power-button to the palm-rest and keyboard assembly. Next steps 1. Install the board. 2.

  • Page 48: Installing The Power-Button With Fingerprint Reader

    Steps 1. Remove the two screws (M2x3) that secure the power-button with fingerprint reader to the palm-rest and keyboard assembly. 2. Lift the power-button with fingerprint reader, along with the fingerprint-reader cable, off the slot on the palm-rest and keyboard assembly. 3.

  • Page 49: System Board

    Steps 1. Align and place the power-button, along with the fingerprint-reader cable, on the slot of the palm-rest and keyboard assembly. 2. Align the screw holes on the power-button with the screw holes on the palm-rest and keyboard assembly. 3. Replace the two screws (M2x3) that secure power-button to the palm-rest and keyboard assembly. 4.
  • Page 50 About this task The following image indicates the connectors on your system board. Figure 1. System-board connectors 1. Display cable 2. Keyboard-backlight cable 3. Keyboard cable 4. Touchpad cable 5. Speaker cable 6. M.2 card slot for solid-state drive 7. M.2 card slot for wireless card 8.
  • Page 51 Steps 1. Open the display-cable connector latch, and disconnect the display cable from the system board. 2. Remove the four screws (M2.5x4) that secure the right display hinge to the system board and palm-rest and keyboard assembly. 3. Open the hinge at an angle of 90 degrees. 4.

  • Page 52: Installing The System Board

    7. Open the latch, and disconnect the keyboard cable from the system board. 8. Open the latch, and disconnect the touchpad cable from the system board. 9. Peel the tape that secures the I/O-board cable to the system board. 10. Open the latch, and disconnect the I/O-board cable from the system board. 11.
  • Page 53 Steps 1. Align and place the system board on the palm-rest and keyboard assembly. 2. Replace the two screws (M2x2) that secure the system board to the palm-rest and keyboard assembly. 3. Connect the display cable to the connector on the system board and close the latch to secure the cable. 4.

  • Page 54: Palm-Rest And Keyboard Assembly

    8. Adhere the tape that secures the I/O-board cable to the system board. 9. Close the right display hinge. 10. Replace the four screws (M2.5x4) that secure the right display hinge to the system board and palm-rest and keyboard assembly. 11.

  • Page 55: Installing The Palm-Rest And Keyboard Assembly

    Steps After performing the steps in the pre-requisites, you are left with the palm-rest and keyboard assembly. Installing the palm-rest and keyboard 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 location of the palm-rest and keyboard assembly and provides a visual representation of the installation procedure.
  • Page 56 Steps Place the palm-rest and keyboard assembly on a clean and flat surface. Next steps 1. Install the system board. NOTE: The system board can be replaced with the heat sink and memory. 2. Install the display assembly. 3. Install the power button power button with fingerprint reader.

  • Page 57: Chapter 3: Drivers And Downloads

    Drivers and downloads When troubleshooting, downloading or installing drivers it is recommended that you read the Dell Knowledge Based article, Drivers and Downloads FAQ 000123347. Drivers and downloads...

  • Page 58: Chapter 4: System Setup

    Boot Sequence allows you to bypass the System Setup–defined boot device order and boot directly to a specific device (for example: optical drive or hard drive). During the Power-on Self Test (POST), when the Dell logo appears, you can: ● Access System Setup by pressing F2 key...

  • Page 59: System Setup Options

    ● Bring up the one-time boot menu by pressing F12 key The one-time boot menu displays the devices that you can boot from including the diagnostic option. The boot menu options are: ● Removable Drive (if available) ● STXXXX Drive (if available) NOTE: XXX denotes the SATA drive number.
  • Page 60 Table 4. System setup options—System information menu (continued) Overview Intel Hyper-Threading Capable Displays whether the processor is Hyper-Threading (HT) capable. 64-Bit Technology Displays whether 64-bit technology is used. MEMORY Memory Installed Displays the total computer memory installed. Memory Available Displays the total computer memory available. Memory Speed Displays the memory speed.
  • Page 61 Table 5. System setup options—Boot Configuration menu (continued) Boot Configuration NOTE: If Custom Mode is not enabled, any changes made with respect to the keys will not be saved. Custom Mode Key Management Allows for selection of key database. ● Save to File will save the key to a user-selected file. ●...
  • Page 62 Table 7. System setup options—Storage menu Storage SATA/NVMe Operation SATA/NVMe Operation Configures operating mode of the integrated storage device controller. Default: RAID On. Storage device is configured to support RAID functions. When enabled, all NVMe and SATA devices will be mapped under VMD controller.
  • Page 63 This setting is a balance of performance, noise, and temperature. USB Wake Support Wake on Dell USB-C Dock Enables connecting a Dell USB-C Dock to wake the computer from Standby. Default: ON Block Sleep Blocks the computer from entering Sleep (S3) mode in the operating system.
  • Page 64 Table 11. System setup options—Security menu (continued) Security PPI Bypass for Clear Commands Enables or disables the Trusted Platform Model (TPM) Physical Presence Interface (PPI). When enabled, the OS will skip BIOS Physical Presence Interface (PPI) user prompts when issuing the Clear command. Default: OFF Clear Enables or disables the computer to clear the PTT owner information, and...
  • Page 65 Enables or disables cloud Service OS recovery if the main OS fails to boot within the number of failures equal or greater than the value specified by Dell Auto OS Recovery Threshold, and local Service does not boot, or is not installed.
  • Page 66 Table 14. System setup options—System Management menu (continued) System Management Wake on AC Enables or disables basic checks when AC power is applied to the device. The checks include determining how the AC Recovery option is set. The system will boot up if Wake on AC is enabled, the system will power off, if Wake on AC is disabled.
  • Page 67 Table 16. System setup options—Pre-boot Behavior menu (continued) Pre-boot Behavior USB-C Warnings Specify the maximum number of characters allowed for Admin password. Default: 32 Enable Dock Warning Messages Enable or disable dock warning messages. Default: ON Fastboot Configures the speed of the UEFI boot process. Default: Thorough.

  • Page 68: System And Setup Password

    Table 18. System setup options—Performance menu (continued) Performance Default: ON Intel Turbo Boost Technology Enable Intel Turbo Boost Technology Enables or disables the Intel TurboBoost mode of the processor. If enabled, the Intel TurboBoost driver increases the performance of the CPU or graphics processor.

  • Page 69: Assigning A System Setup Password

    6. Press Y to save the changes and exit from System Setup. The computer restarts. 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. System setup...

  • Page 70: Updating The Bios

    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 71 ● USB drive formatted to the FAT32 file system (key does not have to be bootable) ● BIOS executable file that you downloaded from the Dell Support website and copied to the root of the USB drive ● AC power adapter that is connected to the computer ●...

  • Page 72: 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 73: 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 74: Supportassist Diagnostics

    Indicates a problem with the system Indicates a problem with the system board. board. 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 75: Wifi Power Cycle

    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 76: 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 23. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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