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Dell P157G Service Manual
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Dell P157G Service Manual

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Inspiron 14 5420
Service Manual
Regulatory Model: P157G
Regulatory Type: P157G001/P157G002
February 2022
Rev. A00

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Summary of Contents for Dell P157G

  • Page 1 Inspiron 14 5420 Service Manual Regulatory Model: P157G Regulatory Type: P157G001/P157G002 February 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..................6 Before working inside your computer..........................6 Entering Service Mode...............................6 Safety instructions................................6 Electrostatic discharge—ESD protection........................7 ESD field service kit ................................8 Transporting sensitive components..........................9 Exiting Service Mode................................9 After working inside your computer..........................9 Chapter 2: Removing and installing components................
  • Page 4 Updating the BIOS in Linux and Ubuntu........................ 68 Updating the BIOS from the F12 One-Time boot menu..................69 Chapter 5: Troubleshooting......................70 Handling swollen Lithium-ion batteries........................70 Locate the Service Tag or Express Service Code of your Dell computer ..........70 System-diagnostic lights..............................71 Contents...
  • Page 5 SupportAssist | On-board Diagnostics......................... 72 Recovering the operating system..........................72 WiFi power cycle................................72 Drain residual flea power (perform hard reset)......................73 Chapter 6: Getting help and contacting Dell................74 Contents...

  • Page 6: Chapter 1: Working Inside Your Computer

    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 7: 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 8: 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 9: 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. Lifting equipment Adhere to the following guidelines when lifting heavy weight equipment: CAUTION: Do not lift greater than 50 pounds.

  • 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 may require the following tools: ● Phillips screwdriver #0 ● Phillips screwdriver #1 ●...

  • Page 11: Major Components Of Inspiron 14 5420

    Table 1. Screw list (continued) Component Secured to Screw type Quantity Screw image Touchpad bracket Palm-rest and keyboard M1.6x2 assembly Power-button with Palm-rest and keyboard M2x3 optional fingerprint assembly reader USB-C port bracket System board M2x4 Display hinges Palm-rest and keyboard M2.5x4 assembly I/O board...
  • Page 12 1. Base cover 2. USB-C port bracket 3. System board 4. Coin-cell battery 5. Left speaker 6. Heat sink 7. Memory 8. Palm-rest and keyboard assembly 9. Display assembly 10. Touchpad 11. Touchpad bracket 12. I/O board Removing and installing components...

  • Page 13: Base Cover

    20. Power-adapter port 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 Steps 1. Remove the five screws (M2x4) that secure the base cover to the palm-rest assembly. 2. Loosen the two captive screws. 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: Installing The Base Cover

    Installing the base cover 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 base cover and provides a visual representation of the installation procedure. Removing and installing components...

  • Page 17: Battery Cable

    Steps 1. Connect the battery cable to the system board. 2. Place and snap the base cover into place on the palm-rest assembly. 3. Tighten the two captive screws on the base cover. 4. Replace the five screws (M2x4) that secure the base cover to the palm-rest assembly. Next steps 1.

  • Page 18: Installing The Battery Cable

    Steps 1. Peel the tape that secures the battery cable to the battery. 2. Disconnect the battery cable from the system board. 3. Remove the battery cable from the routing guides on the battery. 4. Disconnect the battery cable from the battery. 5.

  • Page 19: Battery

    Steps 1. Connect the battery cable to the battery. 2. Route the battery cable through the routing guides on the battery. 3. Connect the battery cable to the system board. 4. Adhere the tape that secures the battery cable to the battery. Next steps 1.

  • Page 20: 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 21: Coin-Cell Battery

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

  • Page 22: Installing The Coin-Cell Battery

    Steps 1. Disconnect the coin-cell battery from the I/O board. 2. Peel and lift the coin-cell battery from 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 process. About this task The following image(s) indicate the location of the coin-cell battery and provides a visual representation of the installation procedure.

  • Page 23: Solid-State Drive

    Steps 1. Connect the coin-cell battery cable to the I/O board. 2. Adhere the coin-cell battery to the palm-rest and keyboard assembly. 3. Connect the battery cable to the system board. 4. Adhere the tape that secures the battery cable to the battery. Next steps 1.
  • Page 24 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 25: 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 26: Removing The M.2 2280 Solid-State Drive

    Steps 1. Align the round 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 (M2x1.8) that secures the M.2 2230 solid-state drive to the M.2 2230 solid-state drive bracket. 3.

  • Page 27: 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 28 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 29: Memory Module

    Memory module Removing the memory module Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the base cover. About this task The following image(s) indicate the location of the memory module and provides a visual representation of the removal procedure.

  • Page 30: Installing The Memory Module

    Installing the memory module 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 memory module and provides a visual representation of the installation procedure.

  • Page 31: Wireless Card

    3. Follow the procedure in After working inside your computer. Wireless card Removing the wireless card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the base cover. About this task The following image(s) indicate the location of the wireless card and provides a visual representation of the removal procedure. Steps 1.

  • Page 32: Installing The Wireless Card

    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 33: Power-Adapter Port

    Next steps 1. Install the base cover. 2. Exit Service Mode. 3. Follow the procedure in After working inside your computer. Power-adapter port Removing the power-adapter port Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode.

  • Page 34: Installing The Power-Adapter Port

    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 35: Display Assembly

    Display assembly Removing the display assembly Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the base cover. About this task The following image(s) indicate the location of the display assembly and provides a visual representation of the removal procedure.
  • Page 36 Steps 1. Peel the tape that secures the display-cable connector latch to the system board. 2. Lift the latch and disconnect the display-cable from the connector on the system board. 3. Remove the two screws (M2.5x4) that secure the right display hinge to the system board. 4.

  • Page 37: Installing The Display Assembly

    5. Remove the two screws (M2.5x4) that secure the left display hinge to the I/O board. 6. Pry open the left display hinge at an angle of 90 degrees. 7. Gently lift the palm-rest and keyboard assembly off the display assembly. CAUTION: To avoid damaging the display, do not slide the palm-rest and keyboard assembly over the display assembly.
  • Page 38 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 39: I/O Board

    I/O board Removing the I/O board Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Enter Service Mode. 3. Remove the base cover. 4. Remove the display assembly. About this task The following image(s) indicate the location of the I/O board and provides a visual representation of the removal procedure. Steps 1.

  • Page 40: Installing The I/O Board

    Installing the I/O board 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 I/O board and provides a visual representation of the installation procedure. Steps 1.

  • Page 41: Speakers

    Speakers Removing the speakers Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. About this task NOTE: The wireless-card antennas are attached to the speakers as an assembly and cannot be separated for individual replacement.

  • Page 42: Installing The Speakers

    3. Lift the latch and disconnect the touchpad cable from the system board. 4. Lift the latch and disconnect the keyboard cable from the system board. 5. Lift the latch and disconnect the keyboard-backlight cable from the system board. 6. Disconnect the speaker cable from the system board. 7.

  • Page 43: Touchpad

    2. Route the speaker cable through the routing guides on the palm-rest and keyboard assembly. 3. Connect the speaker cable to the connector on the system board. 4. Adhere the tape that secures the speaker cable to the palm-rest and keyboard assembly. 5.

  • Page 44: Installing The Touchpad

    4. Remove the two screws (M2x1.8) that secure the touchpad to the palm-rest and keyboard assembly. 5. Peel the tapes that secure the touchpad to the palm-rest and keyboard assembly. 6. Lift the touchpad off the palm-rest and keyboard assembly. Installing the touchpad Prerequisites If you are replacing a component, remove the existing component before performing the installation process.

  • Page 45: Fan

    6. Align the screw holes on the touchpad bracket to the screw holes on the palm-rest and keyboard assembly. 7. Replace the three screws (M1.6x2) that secure the touchpad bracket to the palm-rest and keyboard assembly. 8. Adhere the tapes that secure the touchpad to the palm-rest and keyboard asssembly. 9.

  • Page 46: Installing The Fan

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

  • Page 47: Installing The Heat Sink (Uma)

    About this task CAUTION: The heat sink may become hot during normal operation. Allow sufficient time for the heat sink to cool before you touch it. NOTE: For maximum cooling of the processor, do not touch the heat transfer areas on the heat sink. The oils in your skin can reduce the heat transfer capability of the thermal grease.

  • Page 48: Removing The Heat Sink (Discrete)

    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 ) tighten the four captive screws that secure the heat sink to the system board. NOTE: The number of screws varies depending on the configuration ordered.

  • Page 49: Installing The Heat Sink (Discrete)

    Steps 1. 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. 2.

  • Page 50: Power Button With Optional Fingerprint Reader

    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.

  • Page 51: Installing The Power Button With Optional Fingerprint Reader

    Steps 1. Remove the screw (M2x3) that secures the power button with optional fingerprint reader to the palm-rest and keyboard assembly. 2. Lift the power button with optional fingerprint reader off the palm-rest and keyboard assembly. Installing the power button with optional fingerprint reader Prerequisites If you are replacing a component, remove the existing component before performing the installation process.

  • Page 52: System Board

    Steps 1. Align and place the power button with optional fingerprint reader 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. Next steps 1.
  • Page 53 1. display cable 2. power-adapter port cable 3. keyboard-backlight cable 4. keyboard cable 5. touchpad cable 6. battery cable 7. wireless-card cable 8. speaker cable 9. M.2 2230/2280 solid-state drive 10. I/O-board cable 11. fan cable The following image(s) indicate the location of the system board and provides a visual representation of the removal procedure. Removing and installing components...
  • Page 54 Steps 1. Peel off the tape that secures the display cable to the system board. 2. Lift the latch and disconnect the display cable from the system board. 3. Peel off the tapes that secure the I/O-board cable and antenna cables to the palm-rest and keyboard assembly. 4.

  • Page 55: Installing The System Board

    6. Disconnect the speaker cable from the system board. 7. Lift the latch and disconnect the touchpad cable from the system board. 8. Lift the latch and disconnect the keyboard cable from the system board. 9. Lift the latch and disconnect the keyboard-backlight cable from the system board. 10.
  • Page 56 Steps 1. Install the system board at an angle and ensure that the ports are properly aligned with the port openings. 2. Align the screw holes on the system board with the screw holes on the palm-rest and keyboard assembly. 3.

  • Page 57: Palm-Rest And Keyboard Assembly

    6. Connect the I/O-board cable to the system board and close the latch to secure the cable. 7. Adhere the tape that secures the I/O-board cable to the system board. 8. Align the screw holes on USB-C port bracket with the screw holes on the system board. 9.

  • Page 58: Installing The Palm-Rest And Keyboard Assembly

    Steps After performing the steps in the pre-requisites, you are left with the palm-rest and keyoard assembly. Installing the palm-rest and keyboard assembly 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 palm-rest and keyboard assembly and provides a visual representation of the installation procedure.
  • Page 59 Steps Place the palm-rest and keyboard assembly on a flat and clean surface and perform the post-requisites to install the palm-rest and keyboard assembly. Next steps 1. Install the display assembly. 2. Install the touchpad. 3. Install the speakers. 4. Install the power-adapter port.

  • Page 60: 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 61: Chapter 4: System Setup

    System setup CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup program. Certain changes can make your computer work incorrectly. NOTE: 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 62: 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 63 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 64 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 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: 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 67: Deleting Or Changing An Existing System Setup Password

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

  • Page 68: Clearing Bios (System Setup) And System Passwords

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

  • Page 69: 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 70: 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 71: 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 72: 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 73: Drain Residual Flea Power (Perform Hard Reset)

    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 74: 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 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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