Dell Inspiron 14 Plus 7420 Service Manual

Dell Inspiron 14 Plus 7420 Manual

Get Dell Inspiron 14 Plus 7420 PDF manuals and user guides View all Dell Inspiron 14 Plus 7420 manuals
Add to My Manuals
Save this manual to your list of manuals

Dell Inspiron 14 Plus 7420 manual content summary:

  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 1
    Inspiron 14 Plus 7420 Service Manual Regulatory Model: P157G Regulatory Type: P157G003 April 2022 Rev. A00
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 2
    use of your product. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2022 Dell Inc. or its subsidiaries. All rights reserved. Dell
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 3
    Chapter 1: Working inside your computer 5 Safety instructions...5 Before working inside your computer...5 After working inside your computer...8 Chapter 2: Removing and installing components 9 Recommended tools...9 Major components of Inspiron 14 Plus 7420...9 Screw list...11 Base cover...12
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 4
    in Windows 61 Updating the BIOS from the F12 One-Time boot menu 61 Chapter 5: Troubleshooting...63 Handling swollen Lithium-ion batteries...63 Locate the Service Tag or Express Service Code of your Dell computer 63 System-diagnostic lights...64 SupportAssist | On-board Diagnostics...65 Recovering
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 5
    and the contacts. CAUTION: 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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 6
    the computer to put it into Service Mode or the computer does not support Service Mode then proceed to disconnect the may not be obvious, such as intermittent problems or a shortened product life span. As difficult type of damage to recognize and troubleshoot is the intermittent (also called latent
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 7
    physical connection of the wrist strap and bonding wire between your skin, the ESD mat, and the hardware is known as bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never use wireless wrist straps. Always be aware that the internal wires of a wrist strap are prone
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 8
    any other parts that you removed before working on your computer. 4. Connect your computer and all attached devices to their electrical outlets. NOTE: To exit service mode, ensure to connect the AC adapter to the power-adapter port on your computer. 5. Press the power button to turn on the computer
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 9
    tools The procedures in this document may require the following tools: ● Phillips screwdriver #0 ● Phillips screwdriver #1 ● Plastic scribe Major components of Inspiron 14 Plus 7420 The following image shows the major components of Inspiron 14 Plus 7420. Removing and installing components 9
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 10
    1. Base cover 2. Right speaker 3. Right fan 10 Removing and installing components
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 11
    bracket 9. Battery 10. Palm-rest and keyboard assembly 11. Display assembly 12. M.2 thermal shield 13. M.2 solid-state drive (M.2 2280 solid-state drive shown) 14. Memory module 15. Power-button board 16. I/O-board cable 17. Left fan 18. Heat sink 19. Power-button with optional fingerprint-reader 20
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 12
    Base cover Removing the base cover 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. About this task NOTE: Before removing the base cover, ensure
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 13
    Removing and installing components 13
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 14
    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. 14 Removing and installing components
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 15
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 16
    battery can be dangerous. In such an instance, contact Dell technical support for assistance. See www.dell.com/contactdell. ● Always purchase genuine batteries working inside your computer. NOTE: Ensure that your computer is in Service Mode. For more information see, step 6 in Before working inside
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 17
    the M.2 2230 solid-state drive 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. Removing and installing components 17
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 18
    an M.2 2230 solid-state drive installed. NOTE: The M.2 solid-state drive installed on your computer depends on the configuration ordered. The M.2 slot supports one of the following solid-state drives: ● M.2 2230 solid-state drive A mounting bracket for the M.2 2230 solid-state drive is required. The
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 19
    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. The following image(s) indicate the location of the M.2 2230 solid-state drive
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 20
    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. Turn over the M.2 2230 solid-state drive bracket. 4. Slide
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 21
    NOTE: Ensure that your computer is in Service Mode. For more information see, step 6 in Before The M.2 solid-state drive installed on your computer depends on the configuration ordered. The M.2 slot supports one of the following solid-state drives: ● M.2 2230 solid-state drive A mounting bracket
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 22
    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. The following image(s) indicate the location of the M.2 2280 solid-state drive
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 23
    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. 2. Remove the base cover. About this task The following image
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 24
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 25
    card Removing the wireless card 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. About this task The following image
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 26
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 27
    assembly Removing the display assembly 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. About this task The following
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 28
    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. Remove the five screws (M2.5x5)
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 29
    Steps 1. Place the computer on the edge of a table. Removing and installing components 29
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 30
    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. -adapter port cable from the routing guide on the palm-rest and keyboard assembly. 30 Removing and installing components
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 31
    port, along with its cable, into the slot on the palm-rest and keyboard assembly. 2. Route the power-adapter port cable through the routing guide on the palm-rest and keyboard assembly. 3. Adhere the tape that secures the power-adapter port cable to the palm-rest and keyboard assembly. 4. Connect
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 32
    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. 3. Remove the heat sink. About this task The following
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 33
    . Fans Removing the left fan 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. About this task The following image
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 34
    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. Lift the left fan off the palm-rest and keyboard assembly. Installing the left fan Prerequisites If you are replacing a component, remove
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 35
    computer. Removing the right fan 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. About this task The following image
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 36
    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,
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 37
    Heat sink Removing the heat sink 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. About this task CAUTION: The heat sink
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 38
    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 (4>3>2>1) loosen the four captive screws that secure the heat sink to the system board. NOTE: The number of screws varies depending on the configuration ordered.
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 39
    Removing the power-button 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. 3. Remove the display assembly. About
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 40
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 41
    with optional fingerprint reader 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. 3. Remove the heat sink. 4. Remove
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 42
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 43
    board Removing the system 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. 3. Remove the battery. 4. Remove the
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 44
    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. Battery cable 5. Keyboard cable 6. Keyboard-
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 45
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 46
    tape that secures the I/O-board cable-connector latch to the system board. 13. Open the latch and disconnect the I/O-board cable from the system board. 14. Open the latch and disconnect the I/O-board cable from the I/O board. 15. Lift the I/O-board cable off the system board. 16. Remove the three
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 47
    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. Replace the three screws (M2x2) that secure the system board to the palm-
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 48
    and close the latch. 13. Connect the speaker cable to the system board. 14. Connect the touchpad cable to the system board and close the latch. 15. Before working inside your computer. NOTE: Ensure that your computer is in Service Mode. For more information see, step 6 in Before working inside
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 49
    way. 3. Peel off the tape that secures the speaker cable to the palm-rest and keyboard assembly. 4. Remove the speaker cables from the routing guides on the palm-rest and keyboard assembly. 5. Lift the speakers along with their cables off the palm-rest and keyboard assembly. Installing the speakers
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 50
    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 working inside your computer. NOTE: Ensure that your computer is in Service Mode. For more information see, step 6 in Before working inside
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 51
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 52
    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 ● Touchpad Next steps 1. Install the speakers.
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 53
    3 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 53
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 54
    4 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.
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 55
    or may not be displayed. Table 4. System setup options-System information menu Overview BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer. Asset Tag Displays the Asset Tag of the computer. Manufacture Date Displays the manufacture date of
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 56
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 57
    booting from USB mass storage devices such as external hard drive, optical drive, and USB drive. By default, Enable USB Boot Support is selected. Table 7. System setup options-Storage menu Storage SATA/NVMe Operation SATA/NVMe Operation Configures operating mode of the integrated storage
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 58
    Enables or disables the boot flow for SupportAssist OS Recovery tool, in the event of certain system error. Default: ON BIOSConnect 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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 59
    events. Default: Keep Power Event Log Clear POWER Event Log Select keep or clear Power events. Default: Keep System and setup password Table 14. System and setup password Password type System password Setup password Description Password that you must enter to log on to your system. Password
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 60
    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. NOTE: For information on how to reset Windows or application passwords, refer to the documentation
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 61
    support. In the Search support box, enter the Service Tag of your computer, and then click Search. NOTE: If you do not have the Service Tag, use the SupportAssist feature to automatically identify your computer. You can also use the product ID or manually the on-screen instructions to complete the
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 62
    ● 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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 63
    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. For more information on how to find the Service Tag for your computer, see Locate the Service Tag for your Dell Laptop. Troubleshooting
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 64
    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
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 65
    messages that indicate if problems were encountered during the download it from the Dell Support website to troubleshoot and fix your computer when instructions on how to conduct a WiFi power cycle: NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device. Troubleshooting
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 66
    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. 66 Troubleshooting
  • Dell Inspiron 14 Plus 7420 | Service Manual - Page 67
    about your computer through videos, manuals and documents. Your Dell computer is uniquely identified by a Service Tag or Express Service Code. To view relevant support resources for your Dell computer, enter the Service Tag or Express Service Code at www.dell.com/support. For more information on
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
Inspiron 14 Plus 7420
Service Manual
Regulatory Model: P157G
Regulatory Type: P157G003
April 2022
Rev. A00