Dell P126G Service Manual
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Dell P126G Service Manual

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Inspiron 5406 2-in-1
Service Manual
Regulatory Model: P126G
Regulatory Type: P126G004
September 2020
Rev. A00

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  • Page 1 Inspiron 5406 2-in-1 Service Manual Regulatory Model: P126G Regulatory Type: P126G004 September 2020 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2020 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 ................................6 Transporting sensitive components..........................7 After working inside your computer..........................8 Chapter 2: Removing and installing components................9 Recommended tools................................
  • Page 4 Clearing CMOS settings..............................65 Clearing BIOS (System Setup) and System passwords..................65 Chapter 5: Troubleshooting......................66 SupportAssist diagnostics...............................66 Locate the Service Tag or Express Service Code of your Dell computer ..........66 System diagnostic lights..............................66 Built-in self-test (BIST)..............................67 Recovering the operating system..........................68 Flashing the BIOS................................68...

  • Page 5: Chapter 1: 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 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: Transporting Sensitive Components

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

  • Page 8: After Working Inside Your Computer

    After working inside your computer About this task CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer. Steps 1. Replace all screws and ensure that no stray screws remain inside your computer. 2. Connect any external devices, peripherals, or cables you removed before working on your computer. 3.

  • 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 and #1 ● 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 5400 2N1

    Table 1. Screw list (continued) Component Secured to Screw type Quantity Screw image Touchpad Palm-rest and keyboard M2x2 assembly I/O board Palm-rest and keyboard M2x3 assembly Display hinges Palm-rest and keyboard M2.5x 5 assembly Power-button board Palm-rest and keyboard M2x3 assembly Power-button bracket Palm-rest and keyboard...
  • Page 11 19. Solid-state drive thermal bracket 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 12: Base Cover

    Base cover Removing the base cover Prerequisites 1. Follow the procedure in Before working inside your computer. About this task The following images indicate the location of the base cover and provide a visual representation of the removal procedure. Removing and installing components...
  • Page 13 Removing and installing components...

  • Page 14: Installing The Base Cover

    Steps 1. Remove the six 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 three captive screws, the base cover will pop up creating a gap between the base cover and the palm-rest assembly.
  • Page 15 Removing and installing components...

  • Page 16: 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 17: Installing The Battery

    Steps 1. Peel the tape that secures the battery cable to the system board (applicable only if not peeled earlier). 2. Disconnect the battery cable from the system board (applicable only if not disconnected earlier). 3. Remove the five screws (M2x3) that secure the battery to the palm-rest and keyboard assembly. 4.

  • Page 18: 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 19: Installing The Coin-Cell Battery

    Steps 1. Disconnect the coin-cell battery from the I/O board. 2. Remove the coin-cell battery cable from the routing guide on the fan. 3. Using a plastic scribe, peel the coin-cell battery 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.

  • Page 20: Memory Module

    Steps 1. Adhere the coin-cell battery to the slot on the palm-rest and keyboard assembly. 2. Lift the speaker cable and route the coin-cell battery cable through the routing guide on the fan. 3. Connect the coin-cell battery cable to the I/O board. Next steps 1.

  • Page 21: Installing The Memory Modules

    Steps 1. Lift the flap to access the memory module. 2. Use your fingertips to carefully spread apart the securing-clips on each end of the memory-module slot until the memory module pops up. 3. Slide and remove the memory module from the memory-module slot. NOTE: Repeat step 2 to step 3 to remove any other memory modules installed in your computer.
  • Page 22 Steps 1. Lift the flap to access the memory-module slot. 2. Align the notch on the memory module with the tab on the memory-module slot. 3. Slide the memory module firmly at an angle, into the memory-module 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 23: Speakers

    Speakers Removing the speakers 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 speakers and provides a visual representation of the removal procedure. Steps 1.

  • Page 24: 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. Connect the speaker cable to the system board. Next steps 1.

  • Page 25: Installing The Heat Sink

    Steps 1. In reverse sequential order (as indicated on the heat sink), loosen the seven captive screws that secure the heat sink to the system board. 2. Lift the heat sink off the system board. Installing the heat sink Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 26: Power-Adapter Port

    Steps 1. Align the screw holes on the heat sink with the screw holes on the system board. 2. In sequential order (as indicated on the heat sink), tighten the seven captive screws that secure the heat sink to the system board.

  • Page 27: Installing The Power-Adapter Port

    Steps 1. Remove the three screws (M2.5x5) that secure the right display-hinge to the palm-rest and keyboard assembly. 2. Open the right display-hinge at an angle of 90 degrees. 3. Peel the tape that secures the power-adapter port cable to the system board. 4.

  • Page 28: Touchpad

    Steps 1. Place the power-adapter port into the slot on the palm-rest and keyboard assembly. 2. Replace the screw (M2x3) that secures the power-adapter port to the palm-rest and keyboard assembly. 3. Route the power-adapter port cable through the routing guide on the palm-rest and keyboard assembly. 4.

  • Page 29: Installing The Touchpad

    Steps 1. Remove the three screws (M2x2) that secure the touchpad bracket to the palm-rest and keyboard assembly. 2. Open the latch, and disconnect the touchpad cable from the touchpad. 3. Peel the tape that secures the touchpad to the palm-rest and keyboard assembly. 4.

  • Page 30: Solid-State Drive

    Steps 1. Slide the touchpad into the slot on the palm-rest and keyboard assembly. 2. Replace the two screws (M2x2) that secure the touchpad to the palm-rest and keyboard assembly. 3. Adhere the tape that secures the touchpad to the palm-rest and keyboard assembly. 4.

  • Page 31: Installing The M.2 2230 Solid-State Drive

    Steps 1. Remove the screw (M2x3) that secures the solid-state drive thermal bracket to the palm-rest and keyboard assembly. 2. Lift the solid-state drive thermal bracket off the palm-rest and keyboard assembly. 3. Remove the screw (M2x3) that secures the solid-state drive to the solid-state drive bracket. 4.
  • Page 32 The following image indicates the location of the M.2 2230 solid-state drive and provides a visual representation of the installation procedure. Removing and installing components...

  • Page 33: Removing The M.2 2280 Solid-State Drive

    Steps 1. Remove the screw (M1.6x2.5) that secures the solid-state drive bracket to the palm-rest and keyboard assembly. 2. Turn the solid-state drive bracket at an angle of 180 degrees. 3. Insert the solid-state drive bracket into the other solid-state drive bracket slot on the palm-rest and keyboard assembly. 4.

  • Page 34: Installing The M.2 2280 Solid-State Drive

    Steps 1. Remove the screw (M2x3) that secures the solid-state drive thermal bracket to the palm-rest and keyboard assembly. 2. Lift the solid-state drive thermal bracket off the palm-rest and keyboard assembly. 3. Remove the screw (M2x3) that secures the solid-state drive to the solid-state drive bracket. 4.
  • Page 35 The following image indicates the location of the M.2 2280 solid-state drive and provides a visual representation of the installation procedure. NOTE: Perform step 1 to step 3 if you are replacing the M.2 2230 solid-state drive with an M.2 2280 solid-state drive. Removing and installing components...

  • Page 36: Fan

    Steps 1. Remove the screw (M1.6x2.5) that secures the solid-state drive bracket to the palm-rest and keyboard assembly. 2. Turn the solid-state drive bracket at an angle of 180 degrees. 3. Insert the solid-state drive bracket into the other solid-state drive bracket slot on the palm-rest and keyboard assembly. 4.

  • Page 37: Installing The Fan

    3. Lift the fan off the palm-rest and keyboard assembly. Installing the fan 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 fan and provides a visual representation of the installation procedure. Steps 1.

  • Page 38: Installing The I/O Board

    About this task The following image indicates the location of the I/O-board and provides a visual representation of the removal procedure. Steps 1. Remove the two screws (M2.5x5) that secure the left-display hinge to the palm-rest and keyboard assembly. 2. Open the left-display hinge at an angle of 90 degrees. 3.

  • Page 39: Power Button With Fingerprint Reader

    Steps 1. Slide the I/O board into the slots on the palm-rest and keyboard assembly. 2. Align the screw hole on the I/O board with the screw hole on the palm-rest and keyboard assembly. 3. Replace the screw (M2x3) that secures the I/O board to the palm-rest and keyboard assembly. 4.

  • Page 40: Installing The Power-Button Board

    About this task The following image indicates the location of the power button with fingerprint reader and provides a visual representation of the removal procedure. Steps 1. Remove the two screws (M2x3) that secure the power-button bracket to the palm-rest and keyboard assembly. 2.

  • Page 41: Display Assembly

    Steps 1. Align and place the power button, along with its cable, on the slot of the palm-rest and keyboard assembly. 2. Slide the power-button cable into the connector on the fingerprint reader-board and close the latch to secure the cable. 3.
  • Page 42 About this task The following image indicates the location of the display assembly and provides a visual representation of the removal procedure. Removing and installing components...
  • Page 43 Steps 1. Peel the tape that secures the display cable to the system board. 2. Open the latch, and disconnect the display cable from the system board. 3. Remove the two screws (M2.5x5) that secure the left-display hinges to the palm-rest and keyboard assembly. 4.

  • Page 44: Installing The Display Assembly

    5. Lift at an angle and slide the display assembly off the palm-rest and keyboard assembly. Installing the display assembly Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the display assembly and provides a visual representation of the installation procedure.
  • Page 45 Steps 1. Slide the display assembly at an angle, and place the display assembly on the palm-rest and keyboard assembly. 2. Replace the two screws (M2.5x5) that secure the left-display hinge to the palm-rest and keyboard assembly. 3. Replace the three screws (M2.5x5) that secure the right-display hinge to the palm-rest and keyboard assembly. 4.

  • Page 46: System Board

    System board Removing the system board Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the coin-cell battery. 5. Remove the memory modules. 6. Remove the M.2 2230 solid-state drive M.2 2280 solid-state drive, as applicable.
  • Page 47 Steps 1. Remove the three screws (M2.5x5) that secure the right-display hinge to the palm-rest and keyboard assembly.. 2. Open the hinge at an angle of 90 degrees. 3. Peel the tape that secures the USB Type-C port bracket to the system board. 4.

  • Page 48: Installing The System Board

    5. Peel the tape that secures the I/O-board cable to the system board. 6. Open the latch, and disconnect the I/O-board cable from the system board. 7. Disconnect the speaker cable from the system board. 8. Open the latch, and disconnect the touchpad cable from the system board. 9.
  • Page 49 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 50: Palm-Rest And Keyboard Assembly

    5. Connect the power-adapter port cable to the connector on the system board. 6. Align the screw holes on the USB Type-C port bracket with the screw holes on the system board. 7. Adhere the tape that secures the USB Type-C port bracket to the system board. 8.

  • Page 51: 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 52 Steps Place the palm-rest and keyboard assembly on a clean and flat surface. Next steps 1. Install the system board. 2. Install the display assembly. 3. Install the power-button board. 4. Install the touchpad. 5. Install the power-adapter port. 6. Install the fan. 7.

  • Page 53: 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 SLN128938. Drivers and downloads...

  • Page 54: 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 55: One Time Boot Menu

    ● 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 56 Table 3. System setup options—System information menu (continued) Overview Health Displays the battery health. AC Adapter Displays whether an AC adapter is connected. If connected, the AC adapter type. PROCESSOR Processor Type Displays the processor type. Maximum Clock Speed Displays the maximum processor clock speed. Minimum Clock Speed Displays the minimum processor clock speed.
  • Page 57 Table 4. System setup options—Boot Configuration menu (continued) Boot Configuration By default, UEFI Hard Drive is selected Secure Boot Enable Secure Boot Enables secure boot using only validated boot software. Secure Boot Mode Displays the secure boot mode Expert Key Management Enable Custom Mode Allows the PK, KEK, db, and dbx security key databases to be modified.
  • Page 58 Table 6. System setup options—Storage menu (continued) Storage Port Enablement Enables or disables the onboard drives. Default: ON SMART Reporting Enable SMART Reporting Enables or disables Self-Monitoring, Analysis, and Reporting Technology (SMART). Default: OFF Drive Information Displays the information of various onboard drives. Table 7.
  • Page 59 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 60 Table 10. System setup options—Security menu (continued) Security Default: OFF Clear Enables or disables the computer to clear the PTT owner information, and returns the PTT to the default state. Default: OFF SMM Security Mitigation Enables or disables additional UEFI SMM Security Mitigation protections. Default: OFF NOTE: This feature may cause compatibility issues or loss of functionality...
  • Page 61 Table 10. System setup options—Security menu (continued) Security Default: ON SHA-256 Enables or disables the BIOS and the TPM to use the SHA-256 hash algorithm to extend measurements into the TPM PCRs during BIOS boot. Default: ON Clear Enables or disables the computer to clear the PTT owner information, and returns the PTT to the default state.
  • Page 62 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 63 Table 13. System setup options—System Management menu System Management Service Tag Displays the Service Tag of the computer. Creates a system Asset Tag that can be used by an IT administrator to Asset Tag uniquely identify a particular system. Once set in BIOS, the Asset Tag cannot be changed.
  • Page 64 Table 15. System setup options—Pre-boot Behavior menu (continued) Pre-boot Behavior 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. Performs complete hardware and configuration initialization during boot.

  • Page 65: Clearing Cmos Settings

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

  • Page 66: Chapter 5: Troubleshooting

    Locate the Service Tag or Express Service Code of your Dell computer Your Dell computer is uniquely identified by a Service Tag or Express Service Code. To view relevant support resources for your Dell computer, we recommend entering the Service Tag or Express Service Code at www.dell.com/support.

  • Page 67: Built-In Self-Test (Bist)

    Table 19. LED codes Diagnostic light codes Problem description Processor failure System board: BIOS or ROM (Read-Only Memory) failure No memory or RAM (Random-Access Memory) detected Memory or RAM (Random-Access Memory) failure Invalid memory installed System-board or chipset error Display failure Coin-cell battery failure PCI, video card/chip failure Recovery image not found...

  • Page 68: Recovering The Operating System

    It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its factory state. You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their primary operating system due to software or hardware failures.

  • Page 69: Backup Media And Recovery Options

    Backup media and recovery options It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell proposes multiple options for recovering Windows operating system on your Dell PC. For more information. see...

  • Page 70: 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 21. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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Inspiron 5406 2-in-1

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