Dell Inspiron 14 5420 Service Manual
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Dell Inspiron 14 5420 Service Manual

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Inspiron 14 5420
Service Manual - NVIDIA GeForce RTX 2050
Regulatory Model: P157G
Regulatory Type: P157G001/P157G002
July 2022
Rev. A00

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Summary of Contents for Dell Inspiron 14 5420

  • Page 1 Inspiron 14 5420 Service Manual - NVIDIA GeForce RTX 2050 Regulatory Model: P157G Regulatory Type: P157G001/P157G002 July 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 Technologies, Dell, 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: Identifying the correct manual for your Inspiron 14 5420..........5 Chapter 2: Working inside your computer..................6 Safety instructions................................6 Before working inside your computer........................6 After working inside your computer..........................9 Chapter 3: Removing and installing components................10 Recommended tools................................10...
  • Page 4 Updating the BIOS from the F12 One-Time boot menu..................62 Chapter 6: Troubleshooting......................64 Handling swollen Lithium-ion batteries........................64 Locate the Service Tag or Express Service Code of your Dell computer ..........64 System-diagnostic lights..............................65 SupportAssist | On-board Diagnostics.........................66 Recovering the operating system..........................66 WiFi power cycle................................

  • Page 5: Chapter 1: Identifying The Correct Manual For Your Inspiron 14 5420

    Inspiron 14 5420 The internal layout of the components and the design of the system board of your Inspiron 14 5420 will differ depending on the graphics card configuration you have ordered. This manual only applies to computers shipped with a NVIDIA GeForce RTX 2050 graphics card.

  • Page 6: Chapter 2: Working Inside Your Computer

    You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that is shipped with the product or at www.dell.com/regulatory_compliance.
  • Page 7 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 8 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 9: After Working Inside Your Computer

    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 10: Chapter 3: Removing And Installing Components

    The procedures in this document may require the following tools: ● Phillips screwdriver #0 ● Phillips screwdriver #1 ● Plastic scribe Major components of Inspiron 14 5420 The following image shows the major components of Inspiron 14 5420. Removing and installing components...
  • Page 11 1. Base cover 2. Right speaker 3. Right fan Removing and installing components...

  • Page 12: Screw List

    21. 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: Base Cover

    Table 1. Screw list (continued) Component Screw type Quantity Screw image Wireless-card bracket M2x3 Power-button board M2x3 Power-button with optional M2x3 fingerprint reader Type-C port bracket M2x4 Display assembly M2.5x5 I/O board M2x3 System board M2x2 Base cover Removing the base cover Prerequisites 1.
  • Page 14 Removing and installing components...

  • Page 15: Installing The Base Cover

    Steps 1. Remove the five screws (M2x4) that secure the base cover to the palm-rest and keyboard assembly. 2. Loosen the two captive screws that secure the base cover to the palm-rest and keyboard assembly. 3. Using a plastic scribe, pry the base cover from the bottom left and continue to work on the sides to open the base cover. 4.

  • Page 16: Battery

    Steps 1. Place and snap the base cover into place on the palm-rest and keyboard assembly. 2. Tighten the two captive screws that secure the base cover to the palm-rest and keyboard assembly. 3. Replace the five screws (M2x4) that secure the base cover to the palm-rest and keyboard assembly. Next steps 1.

  • Page 17: Removing The Battery

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

  • Page 18: Installing The Battery

    Installing the battery Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image(s) indicate the location of the battery and provides a visual representation of the installation procedure. Steps 1.
  • Page 19 If you are replacing the M.2 2280 solid-state drive (shipped with the computer) with an M.2 2230 solid-state drive, a mounting bracket for the M.2 2230 solid-state drive is required. Please contact Dell support to purchase the mounting bracket for the M.2 2230 solid-state drive.

  • Page 20: Installing The M.2 2230 Solid-State Drive

    If you are replacing the M.2 2280 solid-state drive (shipped with the computer) with an M.2 2230 solid-state drive, a mounting bracket for the M.2 2230 solid-state drive is required. Please contact Dell support to purchase the mounting bracket for the M.2 2230 solid-state drive.

  • Page 21: Removing The M.2 2280 Solid-State Drive

    Steps 1. Align the notch on the M.2 2230 solid-state drive with the screw (M2x2) on the M.2 2230 solid-state drive bracket. 2. Tighten the screw (M2x2) that secures the M.2 2230 solid-state drive to the M.2 2230 solid-state drive bracket. 3.
  • Page 22 If you are replacing the M.2 2280 solid-state drive (shipped with the computer) with an M.2 2230 solid-state drive, a mounting bracket for the M.2 2230 solid-state drive is required. Please contact Dell support to purchase the mounting bracket for the M.2 2230 solid-state drive.

  • Page 23: Installing The M.2 2280 Solid-State Drive

    If you are replacing the M.2 2280 solid-state drive (shipped with the computer) with an M.2 2230 solid-state drive, a mounting bracket for the M.2 2230 solid-state drive is required. Please contact Dell support to purchase the mounting bracket for the M.2 2230 solid-state drive.

  • Page 24: Memory Module

    Next steps 1. Install the base cover. 2. Follow the procedure in After working inside your computer. Memory module Removing the memory module Prerequisites 1. Follow the procedure in Before working inside your computer. NOTE: Ensure that your computer is in Service Mode. For more information see, step 6 in Before working inside your computer.

  • Page 25: Installing The Memory Module

    Steps 1. Lift the Mylar to access the memory module. 2. Using your fingertips, carefully spread apart the securing-clips on each end of the memory-module slot until the memory module pops-up. 3. Remove the memory module from the memory-module slot on the system board. Installing the memory module Prerequisites If you are replacing a component, remove the existing component before performing the installation process.

  • Page 26: Wireless Card

    3. Slide the memory module into the memory-module slot on the system board. 4. Press down on the memory module till the securing clips click, locking the memory module in place. Next steps 1. Install the base cover. 2. Follow the procedure in After working inside your computer.

  • Page 27: Installing The Wireless Card

    2. Lift the wireless-card bracket off the wireless card. 3. Disconnect the antenna cables from the wireless card. 4. Slide and remove the wireless card from the M.2 card slot on the system board. Installing the wireless card Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image(s) indicate the location of the wireless card and provides a visual representation of the installation procedure.

  • Page 28: Display Assembly

    3. Slide the wireless card into the M.2 card slot on the system board. 4. Place the wireless-card bracket on the wireless card. 5. Replace the screw (M2x3) that secures the wireless card and wireless-card bracket to the system board. Next steps 1.

  • Page 29: Installing The Display Assembly

    Steps 1. Peel off 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. Open the display assembly to a 90-degree angle and place the computer on the edge of a table. 4.
  • Page 30 Steps 1. Place the computer on the edge of a table. Removing and installing components...

  • Page 31: Power-Adapter Port

    2. Hold the display assembly against the edge of the table, aligning the screw holes on the display hinges with the screw holes on the palm-rest and keyboard assembly. 3. Replace the five screws (M2.5x5) that secure the display hinges to the palm-rest and keyboard assembly. 4.

  • Page 32: Installing The Power-Adapter Port

    4. Remove the power-adapter port cable from the routing guide on the palm-rest and keyboard assembly. 5. Lift the power-adapter port, along with its cable, off the palm-rest and keyboard assembly. Installing the power-adapter port Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image(s) indicate the location of the power-adapter port and provides a visual representation of the installation procedure.

  • Page 33: I/O Board

    I/O board Removing the I/O board Prerequisites 1. Follow the procedure in Before working inside your computer. NOTE: Ensure that your computer is in Service Mode. For more information see, step 6 in Before working inside your computer. 2. Remove the base cover.

  • Page 34: Fans

    About this task The following image(s) indicate the location of the I/O board and provides a visual representation of the installation procedure. Steps 1. Place the I/O board on the palm-rest and keyboard assembly. 2. Align the screw holes on the I/O board with the screw holes on the palm-rest and keyboard assembly. 3.

  • Page 35: Installing The Left Fan

    About this task The following image(s) indicate the location of the left fan and provides a visual representation of the removal procedure. Steps 1. Disconnect the left fan cable from the system board. 2. Remove the two screws (M2x3) that secure the left fan to the palm-rest and keyboard assembly. 3.

  • Page 36: Removing The Right Fan

    Steps 1. Place the left fan on the palm-rest and keyboard assembly. 2. Align the screw holes on the left fan with the screw holes on the palm-rest and keyboard assembly. 3. Replace the two screws (M2x3) that secure the left fan to the palm-rest and keyboard assembly. 4.

  • Page 37: Installing The Right Fan

    Steps 1. Disconnect the right fan cable from the system board. 2. Remove the two screws (M2x3) that secure the right fan to the palm-rest and keyboard assembly. 3. Lift the right fan off the palm-rest and keyboard assembly. Installing the right fan Prerequisites If you are replacing a component, remove the existing component before performing the installation process.

  • Page 38: Heat Sink

    Steps 1. Place the right fan on the palm-rest and keyboard assembly. 2. Align the screw holes on the right fan with the screw holes on the palm-rest and keyboard assembly. 3. Replace the two screws (M2x3) that secure the right fan to the palm-rest and keyboard assembly. 4.

  • Page 39: Installing The Heat Sink

    Steps 1. Disconnect the left fan cable from the system board and lift the left fan cable off the heat sink. 2. In reverse sequential order (7>6>5>4>3>2>1)loosen the seven captive screws that secure the heat sink to the system board. NOTE: The number of screws varies depending on the configuration ordered.

  • Page 40: Power-Button Board

    Steps 1. Place the heat sink on the system board. 2. Align the screw holes on the heat sink to the screw holes on the system board. 3. In sequential order (1>2>3>4>5>6>7) tighten the seven captive screws that secure the heat sink to the system board. NOTE: The number of screws varies depending on the configuration ordered.

  • Page 41: Installing The Power-Button Board

    Steps 1. Open the latch and disconnect the power-button board cable from the system board. 2. Remove the screw (M2x3) that secures the power-button board to the palm-rest and keyboard assembly. 3. Lift the power-button board and its cable off the palm-rest and keyboard assembly. Installing the power-button board Prerequisites If you are replacing a component, remove the existing component before performing the installation process.

  • Page 42: Power Button With Optional Fingerprint Reader

    Steps 1. Align and place the power-button board on the palm-rest and keyboard assembly. 2. Replace the screw (M2x3) that secures the power-button board to the palm-rest and keyboard assembly. 3. Connect the power-button board cable to the system board and close the latch. Next steps 1.

  • Page 43: Installing The Power Button With Optional Fingerprint Reader

    Steps 1. Peel off the Mylar that covers the fingerprint-reader cable. 2. Peel off the tape that secures the fingerprint-reader cable to the palm-rest and keyboard assembly. 3. Open the latch and disconnect the fingerprint-reader cable from the I/O board. Steps 1 to 3 are applicable to computers shipped with a fingerprint reader.

  • Page 44: System Board

    Steps 1. Align the screw hole on the power button with optional fingerprint reader with the screw hole on the palm-rest and keyboard assembly. 2. Replace the screw (M2x3) that secures the power button with optional fingerprint reader to the palm-rest and keyboard assembly.
  • Page 45 6. Remove the wireless card. 7. Remove the right fan. 8. Remove the heat sink. About this task The following image indicates the connectors and M.2 card slots on your system board. 1. Power-adapter port cable 2. Display cable 3. Right fan cable 4.
  • Page 46 Steps 1. Open the latch and disconnect the power-button board cable from the system board. 2. Peel the tape that secures the power-adapter port cable to the system board. 3. Disconnect the power-adapter port cable from the system board. 4. Peel off the tape that secures the display-cable connector latch to the system board. 5.

  • Page 47: Installing The System Board

    8. Open the latch and disconnect the keyboard cable from the system board. 9. Open the latch and disconnect the keyboard-backlight cable from the system board. 10. Disconnect the speaker cable from the system board. 11. Open the latch and disconnect the touchpad cable from the system board. 12.
  • Page 48 12. Left fan cable 13. Power-button cable The following image(s) indicate the location of the system board and provides a visual representation of the installation procedure. Steps 1. Install the system board at an angle and ensure that the ports are properly aligned with the port openings. 2.

  • Page 49: Speakers

    3. Replace the three screws (M2x2) that secure the system board to the palm-rest and keyboard assembly. 4. Connect the power-button cable to the system board and close the latch. 5. Connect the power-adapter port cable to the system board. 6.

  • Page 50: Installing The Speakers

    Steps 1. Peel off the tapes that secure the antenna cables to the palm-rest and keyboard assembly. 2. Lift the antenna cables and move them out of the way. 3. Peel off the tape that secures the speaker cable to the palm-rest and keyboard assembly. 4.

  • Page 51: Palm-Rest And Keyboard Assembly

    Steps 1. Using the alignment posts, place the left speaker and the right speaker on 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 tape that secures the speaker cable to the palm-rest and keyboard assembly. 4.

  • Page 52: Installing The Palm-Rest And Keyboard Assembly

    10. Remove the power-button board. 11. Remove the power button with optional fingerprint reader. 12. Remove the system board. 13. Remove the speakers. About this task The following image(s) indicate the location of the palm-rest and keyboard assembly and provides a visual representation of the removal procedure.
  • Page 53 Steps Place the palm-rest and keyboard assembly on a flat and clean surface and perform the tasks in Next steps to install the palm-rest and keyboard assembly. NOTE: The palm-rest and keyboard assembly consists of the following: ● Palm-rest ● Keyboard ●...

  • Page 54: Chapter 4: 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 55: Chapter 5: System Setup

    System setup CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup program. Certain changes can make your computer work incorrectly. NOTE: 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 56: Boot Sequence

    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 57 Table 4. System setup options—System information menu (continued) Overview Processor ID Displays the processor identification code. Processor L2 Cache Displays the processor L2 Cache size. Processor L3 Cache Displays the processor L3 Cache size. Microcode Version Displays the microcode version. Intel Hyper-Threading Capable Displays whether the processor is Hyper-Threading (HT) capable.
  • Page 58 Table 5. System setup options—Boot Configuration menu (continued) Boot Configuration Expert Key Management Enable Custom Mode Allows the PK, KEK, db, and dbx security key databases to be modified. Default: OFF NOTE: If Custom Mode is not enabled, any changes made with respect to the keys will not be saved.
  • Page 59 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 60: System And Setup Password

    Table 12. System setup options—Pre-boot Behavior menu Pre-boot Behavior Adapter warnings Enable Adapter warnings Enables or disables the computer to display adapter warning messages when adapters with too little power capacity are detected. Default: ON Warnings and Errors Selects an action on encountering a warning or error during boot. Default: Prompt on Warnings and Errors.

  • Page 61: Deleting Or Changing An Existing System Setup Password

    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 62: 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 63 ● AC power adapter that is connected to the computer ● Functional computer battery to flash the BIOS Perform the following steps to perform the BIOS update flash process from the F12 menu: CAUTION: Do not turn off the computer during the BIOS update process. The computer may not boot if you turn off your computer.

  • Page 64: Chapter 6: 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 65: System-Diagnostic Lights

    The following diagnostic light codes and recommended solutions are intended for Dell service technicians to troubleshoot problems. You should only perform troubleshooting and repairs as authorized or directed by the Dell technical support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Table 15. Diagnostic-light codes...

  • Page 66: Supportassist | On-Board Diagnostics

    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 67 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. Troubleshooting...

  • Page 68: Chapter 7: 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 16. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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