Dell XPS 8940 Service Manual

Dell XPS 8940 Manual

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  • Dell XPS 8940 | Service Manual - Page 1
    XPS 8940 Service Manual Regulatory Model: D28M Regulatory Type: D28M003 September 2020 Rev. A02
  • Dell XPS 8940 | Service Manual - Page 2
    of data and tells you how to avoid the problem. WARNING: 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
  • Dell XPS 8940 | Service Manual - Page 3
    ...6 Safety instructions...6 Electrostatic discharge-ESD protection...7 ESD field service kit ...7 Transporting sensitive components...8 After working inside your computer...9 Chapter 2: Removing and installing components 10 Recommended tools...10 Screw list...10 Major components of XPS 8940...11
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    coin-cell battery...40 Power-supply unit...41 Removing the power-supply unit...41 Installing the power-supply unit...44 Processor fan Setup) and System passwords 68 Chapter 5: Troubleshooting...69 SupportAssist diagnostics...69 M-BIST...69 System power cycle...76 Flea power release...76 4 Contents
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    Chapter 6: Getting help and contacting Dell 77 Contents 5
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    www.dell.com/ regulatory_compliance. WARNING: Disconnect your computer from all power 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
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    cables, ensure that the ports and the connectors are correctly problems or a shortened product life span. As the industry pushes for lower power type of damage to recognize and troubleshoot is the intermittent (also called being worked on. Once deployed properly, service parts can be removed from the
  • Dell XPS 8940 | Service Manual - Page 8
    desktop or portable environment. Servers are typically installed in a rack within a data center; desktops service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell muscles. Abdominal muscles support your spine when you
  • Dell XPS 8940 | Service Manual - Page 9
    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
  • Dell XPS 8940 | Service Manual - Page 10
    1 3.5-inch hard-drive assembly Chassis #6-32 1 3.5-inch hard drive Hard-drive cage #6-32 4 Wireless-card bracket System board Solid-state drive/Intel Optane memory module Power-supply unit System board Chassis M2x3 1 M2x3 1 #6-32 3 10 Removing and installing components
  • Dell XPS 8940 | Service Manual - Page 11
    image Voltage regulator heat sink Chassis Front I/O bracket System board System board Chassis Chassis Chassis Captive screw 2 M2.5 #6-32 1 #6-32 8 #6-32x3.8 1 Major components of XPS 8940 The following image shows the major components of XPS 8940. Removing and installing components 11
  • Dell XPS 8940 | Service Manual - Page 12
    12 Removing and installing components
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    memory modules 9. hard-drive cage 10. optical drive (optional) 11. power-button module 12. front I/O bracket 13. front cover 14. power-supply unit 15. chassis 16. graphics card 17. processor 18. chassis fan 19. graphics-card supporting bracket 20. hard-drive bracket Left-side cover Removing the left
  • Dell XPS 8940 | Service Manual - Page 14
    Steps 1. Loosen the two captive screws that secure the left-side cover to the chassis. 2. Using the tab on the left-side cover, slide and lift the left-side cover off the chassis. Installing the left-side cover Prerequisites If you are replacing a component, remove the existing component before
  • Dell XPS 8940 | Service Manual - Page 15
    Steps 1. Align the tabs on the left-side cover with the slots on the chassis, and slide it towards the front of the computer. 2. Tighten the two captive screws that secure the left-side cover to the chassis. Next steps 1. Follow the procedure in After working inside your computer. Optical drive (
  • Dell XPS 8940 | Service Manual - Page 16
    About this task The following images indicate the location of the optical drive and provide a visual representation of the removal procedure. 16 Removing and installing components
  • Dell XPS 8940 | Service Manual - Page 17
    Steps 1. Disconnect the power and data cables from the optical drive. 2. Pull the release tab on the optical-drive cage towards the bottom of the computer. 3. Pull to slide out the optical drive through the front of the computer. 4.
  • Dell XPS 8940 | Service Manual - Page 18
    optical drive. 4. Slide the optical drive into the optical-drive cage through the front of the computer until it snaps into place. 5. Connect the power and data cables to the optical drive. Next steps 1. Install the left-side cover. 2. Follow the procedure in After working inside your computer. 18
  • Dell XPS 8940 | Service Manual - Page 19
    purposes only. You do not need to remove the front I/O cover to access the power-button cable. 3. Press the release tabs on the power-button module and push the power-button module out of the chassis. 4. Lift the power-button module, along with its cable, from the chassis. Installing the
  • Dell XPS 8940 | Service Manual - Page 20
    system board. NOTE: The above image is provided for illustrative purposes only. You do not need to remove the front I/O cover to access the power-button cable. Next steps 1. Install the front cover. 2. Install the left-side cover. 3. Follow the procedure in After working inside your computer. Front
  • Dell XPS 8940 | Service Manual - Page 21
    Steps 1. Place the computer in an upright position. 2. Gently pry and release the front-cover tabs from the top-left, working down sequentially to the bottom-left tab. 3. Swing the front cover outwards, away from the chassis,
  • Dell XPS 8940 | Service Manual - Page 22
    Steps 1. Place the computer in an upright position. 2. Insert the right-side front-cover tabs into the corresponding slots on the chassis. 3. Push the left-side of the front cover towards the chassis, snapping the slots into position. Next steps 1. Install the left-side cover. 2. Follow the
  • Dell XPS 8940 | Service Manual - Page 23
    computer on the right side. 2. Disconnect the data and power cables from the hard drive. 3. Press the release tabs on the hard-drive carrier and slide the hard-drive carrier out of the hard-drive cage. 4. Pry the hard-drive carrier to release the tabs on the carrier from the slots on the
  • Dell XPS 8940 | Service Manual - Page 24
    carrier into the hard drive. 3. Slide the hard-drive assembly into the hard-drive cage until it snaps into place. 4. Connect the data cable and power cable to the hard drive. Next steps 1. Install the left-side cover. 2. Follow the procedure in After working inside your computer. 24 Removing and
  • Dell XPS 8940 | Service Manual - Page 25
    representation of the removal procedure. Steps 1. Lay the computer on the right side. 2. Disconnect the data and power cables from the hard drive. 3. Remove the cables from the routing guides on the hard-drive assembly. 4. Remove the screw (#6-32) that secures the 3.5-inch hard-drive assembly to
  • Dell XPS 8940 | Service Manual - Page 26
    5. Lift the hard-drive assembly away from the chassis. 6. Remove the four screws (#6-32) that secure the hard drive to the hard-drive cage. 7. Slide the hard drive from the hard-drive cage. Installing the 3.5-inch hard drive Prerequisites If you are replacing a component, remove the existing
  • Dell XPS 8940 | Service Manual - Page 27
    5. Route the power cable and data cable through the routing guides on the hard-drive assembly and connect the cables to the the fan cable from the system board. 3. Gently pull the fan to release it from the rubber grommets. 4. Remove the fan off the chassis. Removing and installing components 27
  • Dell XPS 8940 | Service Manual - Page 28
    Installing the chassis fan Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the chassis fan and provide a visual representation of the installation procedure.
  • Dell XPS 8940 | Service Manual - Page 29
    2. Route the rubber grommets through the slots on fan and push the rubber grommets until the fan snaps into position. 3. Connect the fan cable to the system board. Next steps 1. Install the left-side cover. 2. Follow the procedure in After working inside your computer. Memory modules Removing the
  • Dell XPS 8940 | Service Manual - Page 30
    Steps 1. Lay the chassis on the right side. 2. Use your fingertips to carefully spread apart the securing-clips on each end of the memory-module slot. 3. Grasp the memory module near the securing clip, and then gently ease the memory module out of the memory-module slot. CAUTION: To prevent damage
  • Dell XPS 8940 | Service Manual - Page 31
    Steps 1. Align the notch on the memory module with the tab on the memory-module slot. 2. Insert the memory module into the memory-module connector until the memory module snaps into position and the securing clip locks in place. CAUTION: To prevent damage to the memory module, hold the memory module
  • Dell XPS 8940 | Service Manual - Page 32
    Steps 1. Lay the computer on the right side. 2. Remove the screw (M2x3) that secures the wireless card to the system board. 3. Slide and lift the wireless-card bracket off the wireless card. 4. Disconnect the antenna cables from the wireless card. 5. Slide and remove the wireless card at an angle
  • Dell XPS 8940 | Service Manual - Page 33
    the antenna cables to the wireless card. The following table provides the antenna-cable color scheme for the wireless card that is supported by your computer. Table 2. Antenna-cable color scheme Connectors on the wireless card Main (white triangle) Auxiliary (black triangle) Antenna-cable color
  • Dell XPS 8940 | Service Manual - Page 34
    Solid-state drive/Intel Optane Removing the solid-state drive/Intel Optane Prerequisites NOTE: You must disable the Intel Optane memory before removing Intel Optane from your computer. For more information about disabling the Intel Optane memory, see Disabling Intel Optane. 1. Follow the procedure
  • Dell XPS 8940 | Service Manual - Page 35
    Steps 1. Align the notch on the solid-state drive/Intel Optane with the tab on the M.2 card slot. 2. Slide the solid-state drive/Intel Optane into the M.2 card slot on the system board. 3. Replace the screw (M2x3) that secures the solid-state drive/Intel Optane to the system board. Next steps 1.
  • Dell XPS 8940 | Service Manual - Page 36
    36 Removing and installing components
  • Dell XPS 8940 | Service Manual - Page 37
    computer on the right side. 2. Disconnect the power cables from the graphics card and remove them from the routing guides on the graphics -card support bracket. NOTE: This step is applicable only for computers that are shipped with a graphics-card support bracket. 3. Pull together the securing tabs
  • Dell XPS 8940 | Service Manual - Page 38
    About this task The following images indicate the location of the graphics card and provide a visual representation of the installation procedure. 38 Removing and installing components
  • Dell XPS 8940 | Service Manual - Page 39
    card. NOTE: This step is applicable only for computers that are shipped with a graphics-card support bracket. 5. Route the cables through the routing guide on the graphics-card support bracket and connect the power cables to the graphics card. Next steps 1. Install the left-side cover. 2. Follow the
  • Dell XPS 8940 | Service Manual - Page 40
    Steps 1. Lay the computer on the right side. 2. Using your finger, push the coin-cell battery-release lever on the coin-cell battery socket to release the coin-cell battery out of the socket. 3. Remove the coin-cell battery. Installing the coin-cell battery Prerequisites If you are replacing a
  • Dell XPS 8940 | Service Manual - Page 41
    1. Install the graphics card. 2. Install the left-side cover. 3. Follow the procedure in After working inside your computer. Power-supply unit Removing the power-supply unit Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the left-side cover. 3. Remove the
  • Dell XPS 8940 | Service Manual - Page 42
    42 Removing and installing components
  • Dell XPS 8940 | Service Manual - Page 43
    Steps 1. Lay the computer on the right side. 2. Disconnect the power cables from the system board and remove them from the routing guides on the chassis. Removing and installing components 43
  • Dell XPS 8940 | Service Manual - Page 44
    installation procedure. NOTE: The cables and ports on the back of the power-supply unit are color-coded to indicate the different power wattage. Ensure that you plug in the cable to the correct port. Failure to do so may result in damaging the power-supply unit and/or computer components. About this
  • Dell XPS 8940 | Service Manual - Page 45
    the securing tab snaps into position. 2. Replace the three screws (#6-32) that secure the power-supply unit to the chassis. 3. Route the power cable through the routing guides on the chassis and connect the power cables to their respective connectors on the system board. Next steps 1. Install the
  • Dell XPS 8940 | Service Manual - Page 46
    Steps 1. Disconnect the processor-fan cable from the system board. 2. In the reverse sequential order (4->3->2->1), loosen the captive screws that secure the processor fan and heat-sink assembly to the system board. 3. Lift the processor fan and heat-sink assembly off the system board. Installing
  • Dell XPS 8940 | Service Manual - Page 47
    Steps 1. Align the numbering on the processor fan and heat-sink assembly with the numbering on the system board. 2. In the sequential order (1->2->3->4), tighten the captive screws that secure the processor fan and heat-sink assembly to the system board. 3. Connect the processor-fan cable from the
  • Dell XPS 8940 | Service Manual - Page 48
    down and then push it away from the processor to release it from the securing tab. 2. Extend the release lever completely and open the processor cover. CAUTION: When removing the processor, do not touch any of the pins inside the socket or allow any
  • Dell XPS 8940 | Service Manual - Page 49
    CAUTION: Ensure that the processor-cover notch is positioned underneath the alignment post. 3. When the processor is fully seated in the socket, pivot the release-lever down and place it under the tab on the processor cover. Next steps 1. Install the processor fan and heat-sink assembly. 2. Install
  • Dell XPS 8940 | Service Manual - Page 50
    Steps 1. Loosen the captive screws that secure the voltage regulator heat sink to the system board. 2. Lift the voltage regulator heat sink off the system board. Installing the voltage regulator heat sink Prerequisites If you are replacing a component, remove the existing component before performing
  • Dell XPS 8940 | Service Manual - Page 51
    Removing the system board Prerequisites 1. Follow the procedure in Before working inside your computer. NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board. NOTE: Before disconnecting the cables
  • Dell XPS 8940 | Service Manual - Page 52
    (SATA0) 11. hard-drive data-cable connector (SATA1) 12. hard-drive data-cable connector (SATA2) 13. optical-drive data-cable connector (SATA3) 14. hard-drive power cable connector (SATA PWR) 15. solid-state drive connector (m.2 PCIe SSD) 16. coin-cell battery 17. wireless-card slot 18. system-board
  • Dell XPS 8940 | Service Manual - Page 53
    Removing and installing components 53
  • Dell XPS 8940 | Service Manual - Page 54
    Steps 1. Lay the computer on the right side. 2. Remove the screw (#6-32) that secures the front I/O-bracket to the chassis. 3. Rotate and remove the front I/O-bracket from the chassis. 4. Disconnect all the cables that are connected to the system board. 5. Remove the eight screws (#6-32) that secure
  • Dell XPS 8940 | Service Manual - Page 55
    (SATA0) 11. hard-drive data-cable connector (SATA1) 12. hard-drive data-cable connector (SATA2) 13. optical-drive data-cable connector (SATA3) 14. hard-drive power cable connector (SATA PWR) 15. solid-state drive connector (m.2 PCIe SSD) 16. coin-cell battery 17. wireless-card slot 18. system-board
  • Dell XPS 8940 | Service Manual - Page 56
    21. PCIe x1 slot 22. chassis-fan cable connector (FAN SYS) The following images indicate the location of the system board and provide a visual representation of the installation procedure. 56 Removing and installing components
  • Dell XPS 8940 | Service Manual - Page 57
    Steps 1. Slide the back I/O-ports on the system board into the front I/O-slots on the chassis and align the screw holes on the system board with the screw holes on
  • Dell XPS 8940 | Service Manual - Page 58
    10. Install the left-side cover. 11. Follow the procedure in After working inside your computer. NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board. NOTE: Replacing the system board removes any
  • Dell XPS 8940 | Service Manual - Page 59
    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 SLN128938. Drivers and downloads 59
  • Dell XPS 8940 | Service Manual - Page 60
    4 System setup NOTE: Depending on the computer and its installed devices, the items listed in this section may or may not be displayed. 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
  • Dell XPS 8940 | Service Manual - Page 61
    : optical drive or hard drive). During the Power-on Self Test (POST), when the Dell logo appears, you can: ● Access System Setup Date Displays the manufacture date of the computer. Ownership Date Displays the ownership date of the computer. Express Service Code Displays the express service
  • Dell XPS 8940 | Service Manual - Page 62
    the system to prompt the user to enter the Admin password when booting a UEFI boot path from the F12 boot menu. Default: Disabled Date/Time Displays the current date in MM/DD/YY format and current time in HH:MM:SS AM/PM format. Table 4. System setup options-System Configuration menu System
  • Dell XPS 8940 | Service Manual - Page 63
    startup. USB Configuration Enable Boot Support Enable or disable booting from Ports Enable or disable the front USB ports. Enable Rear USB Ports Enable or disable the rear USB ports. Front USB Configuration Enable or disable the front USB ports Service from Absolute Software. System setup 63
  • Dell XPS 8940 | Service Manual - Page 64
    Extensions Enclave Reserve Memory Size. Performance Multi Core Support Enable multiple cores. Default: Enabled. Intel SpeedStep when power is restored. Enable or disable Intel Speed Shift Technology. Enable to set the computer to turn on automatically every day or on a preselected date and
  • Dell XPS 8940 | Service Manual - Page 65
    you to control the Deep Sleep mode support. USB Wake Support enables the USB devices to wake the Maintenance menu Maintenance Service Tag Display the system's Service Tag. Asset Tag an external USB key. First Power On Date Enable the user to set the Ownership date. Table 12. System setup
  • Dell XPS 8940 | Service Manual - Page 66
    System Resolution Console and for Dell OS Recovery tool. SupportAssist errors BIOSConnect BIOSConnect enable or disable cloud Service OS upon absence of Local OS Recovery. task To enter the system setup, press F2 immediately after a power-on or reboot. Steps 1. In the System BIOS or System Setup
  • Dell XPS 8940 | Service Manual - Page 67
    power button is held and after it is released. Once the reset is complete, the computer restarts and the Dell logo appears indicates reset success. CAUTION: Once RTC reset is complete, the computer may remain in a no-boot status until the time, date prior to RTC reset) ● Service Tag ● Asset Tag ●
  • Dell XPS 8940 | Service Manual - Page 68
    System Password is used to clear the admin and computer password. 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
  • Dell XPS 8940 | Service Manual - Page 69
    Troubleshooting SupportAssist are completed successfully ● View error messages that indicate if problems were encountered during the test NOTE: Some tests are meant in system board failures. NOTE: M-BIST can be manually initiated before POST (Power On Self Test). How to run M-BIST NOTE: M-
  • Dell XPS 8940 | Service Manual - Page 70
    Engine (ME) error Timeout waiting on ME to reply to HECI message. If problem persists, replace the system board. Power rail failure Update BIOS screen. Camera status light: Indicates whether the camera is in Enable the Pointing Device option in the System Setup program. 70 Troubleshooting
  • Dell XPS 8940 | Service Manual - Page 71
    failed. Contact Dell The optical drive tests in Dell Diagnostics. The appears again, Contact Dell The file that Drive tests in Dell Diagnostics. The hard problem persists, try another drive. Run the Hard Disk Drive tests in Dell problem persists, try another drive. Run the Hard Disk Drive tests in Dell
  • Dell XPS 8940 | Service Manual - Page 72
    Reinstall the operating system. If the problem persists, Contact Dell. OPTIONAL ROM BAD CHECKSUM The optional ROM has failed. Contact Dell. SECTOR NOT FOUND The operating system cannot locate a sector on the hard drive. You may have a defective sector or corrupted File 72 Troubleshooting
  • Dell XPS 8940 | Service Manual - Page 73
    POWER TIME and Support for instructions (click Start > Help and Support). If Dell. The reserve battery that supports the system configuration settings may require recharging. Connect your computer to an electrical outlet to charge the battery. If the problem persists, Contact Dell. The time or date
  • Dell XPS 8940 | Service Manual - Page 74
    website to troubleshoot and fix your computer when it fails to boot into their primary operating system due to software or hardware failures. For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at www.dell.com/support. Flashing BIOS (USB
  • Dell XPS 8940 | Service Manual - Page 75
    dell.com/support. 3. Click Product support, enter the Service Tag of your computer, and then click Submit. NOTE: If you do not have the Service Tag, use the auto-detect feature or manually instructions Dell supports Dell Support website and copied to the root of the USB drive ● AC power USB port of the
  • Dell XPS 8940 | Service Manual - Page 76
    to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be performed. The following procedure provides the instructions on how to conduct a WiFi power cycle: NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device. Steps 1. Turn off your
  • Dell XPS 8940 | Service Manual - Page 77
    Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app Tips Contact Support Online help for operating system Troubleshooting information, user manuals, set up instructions, product specifications, technical help blogs, drivers, software
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XPS 8940
Service Manual
Regulatory Model: D28M
Regulatory Type: D28M003
September 2020
Rev. A02