Dell Latitude 7400 Service Manual

Dell Latitude 7400 Manual

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  • Dell Latitude 7400 | Service Manual - Page 1
    Dell Latitude 7400 Service Manual Regulatory Model: P100G Regulatory Type: P100G001
  • Dell Latitude 7400 | 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. © 2019 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 Latitude 7400 | Service Manual - Page 3
    your computer...6 Safety instructions...6 Before working inside your computer...6 Safety precautions...7 Electrostatic discharge-ESD protection...7 ESD field service kit ...8 Transporting fan assembly...34 Installing the heatsink assembly...35 Power adapter port...37 Removing the power adapter
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    Installing the power adapter port...37 Speakers...38 Removing the speakers...38 Installing the speakers 77 Keyboard...79 Removing the keyboard...79 Installing the keyboard...81 Palmrest...82 5 Troubleshooting...84 Enhanced Pre-Boot System Assessment (ePSA) diagnostics 84 Running the ePSA diagnostics
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    Flashing the BIOS...85 Backup media and recovery options...86 WiFi power cycle...86 Flea power release...86 6 Getting help...87 Contacting Dell...87 Contents 5
  • Dell Latitude 7400 | Service Manual - Page 6
    only perform troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came
  • Dell Latitude 7400 | Service Manual - Page 7
    disassembly instructions. Dell products with standby power must be unplugged before you open the case through the use of a field service electrostatic discharge (ESD) kit. When , such as intermittent problems or a shortened product of damage to recognize and troubleshoot is the intermittent (also
  • Dell Latitude 7400 | Service Manual - Page 8
    for safe transport. ESD protection summary 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
  • Dell Latitude 7400 | Service Manual - Page 9
    5. Keep your back upright, whether lifting or setting down the load. Do not add the weight of your body to the load. Avoid twisting your body and back. 6. Follow the same techniques in reverse to set the load down. After working
  • Dell Latitude 7400 | Service Manual - Page 10
    connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers. Let's take a quick look on the USB evolution devices • New power management features • Full-duplex data transfers and support for new transfer types • Backward USB 2.0 compatibility • New
  • Dell Latitude 7400 | Service Manual - Page 11
    Gen 1 Hard Drives • Portable USB 3.0/USB 3.1 Gen 1 Hard Drives • USB 3.0/USB 3.1 Gen 1 Drive Docks & Adapters • USB 3.0/USB 3.1 Gen 1 Flash Drives & Readers • USB 3.0/USB 3.1 Gen 1 Solid- able to use. USB Type-C ports can support a variety of different protocols using Technology and components 11
  • Dell Latitude 7400 | Service Manual - Page 12
    of power - that'll charge your phone, but that's about it. A laptop might require up to 60 watts, for example. The USB Power Delivery specification ups any dock, display or data device like an external hard drive. Thunderbolt 3 uses a USB Type-C connector/port to connect to supported peripherals.
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    1.4a This topic explains the HDMI 1.4a and its features along with the advantages. HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI provides an interface between any compatible digital audio/video source, such as a DVD player
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    3 Major components of your system 1. Base cover 2. Power adaptor port 14 Major components of your system
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    reader 11. Touchpad button board 12. LED daughterboard 13. Display assembly 14. Palmrest assembly 15. WLAN card 16. WWAN card 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
  • Dell Latitude 7400 | Service Manual - Page 16
    4 Removing and installing components Base cover Removing the base cover Follow the procedure in before working inside your computer. 1. Loosen the eight captive screws that secure the base cover to the computer. 2. Use a plastic scribe to pry the base cover at the indents near the left and right
  • Dell Latitude 7400 | Service Manual - Page 17
    4. Lift and remove the base cover from the computer. Removing and installing components 17
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    Installing the base cover 1. Align and place the base cover on the computer. 2. Press along the edges of the base cover until it clicks into the palmrest assembly. 18 Removing and installing components
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    3. Tighten the eight captive screws to secure the base cover to the computer. Removing and installing components 19
  • Dell Latitude 7400 | Service Manual - Page 20
    to pry on or against the battery. • Ensure any screws during the servicing of this product are not lost or misplaced, to prevent accidental puncture or damage Dell technical support for assistance. See www.dell.com/contactdell. • Always purchase genuine batteries from www.dell.com or authorized Dell
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    Installing the battery 1. Align and place the battery in the computer [1]. 2. Tighten the two captive screws [2] to secure the battery (4-Cell) to the computer. NOTE: A 3-Cell battery has single captive screw that secures the battery to the computer. 3. Connect the battery cable to its connector on
  • Dell Latitude 7400 | Service Manual - Page 22
    1. Install the base cover. 2. Follow the procedure after working inside your computer. Coin cell Removing the coin cell 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Disconnect the LED daughterboard cable from the connector on the
  • Dell Latitude 7400 | Service Manual - Page 23
    3. Disconnect the coin cell cable from the connector on the system board [1]. 4. Remove the coin cell from the computer [2]. Removing and installing components 23
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    Installing the coin cell 1. Connect the coin cell cable to its connector on the system board [1] and adhere the coin cell to the palmrest [2]. 24 Removing and installing components
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    2. Connect the LED board cable to the system board [1] and route the ribbon cable over the coin cell [2]. Removing and installing components 25
  • Dell Latitude 7400 | Service Manual - Page 26
    1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Memory Removing the memory 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Pry the clips securing the memory module until
  • Dell Latitude 7400 | Service Manual - Page 27
    1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Solid state drive Removing the solid state drive 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. NOTE: This procedure
  • Dell Latitude 7400 | Service Manual - Page 28
    3. Slightly lift and remove the SSD out from its connector on the system board. 28 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 29
    Installing the solid state drive 1. Place the SSD on its slot and slide it to its connector on the system board. 2. Place the SSD plate pre-installed with thermal sticker on the underside over the SSD [1]. 3. Tighten the three captive screws to secure the SSD bracket to the palmrest [2]. Removing
  • Dell Latitude 7400 | Service Manual - Page 30
    NOTE: This procedure illustrates a M.2 2280 SSD. M.2 2230 SSD requires a special bracket and plate to secure it to the palmrest assembly. 1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. WLAN card Removing the WLAN card 1. Follow the
  • Dell Latitude 7400 | Service Manual - Page 31
    Installing the WLAN card 1. Insert the WLAN card into its slot on the system board [1]. 2. Connect the antennae cables to the connectors on the WLAN card [2]. 3. Place the metal bracket over the antennae connectors [3]. 4. Replace the single (M2x3) screw to secure the metal bracket to the WLAN card
  • Dell Latitude 7400 | Service Manual - Page 32
    1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. WWAN card Removing the WWAN card 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Remove the single (M2x3) screw that
  • Dell Latitude 7400 | Service Manual - Page 33
    Installing the WWAN card 1. Place the WWAN card into its connector on the system board [1]. 2. Connect the antennae cables to the connectors on WWAN card [2]. 3. Place the metal bracket over the antennae connectors on the WWAN card [3]. 4. Replace the single (M2x3) screw to secure the metal bracket
  • Dell Latitude 7400 | Service Manual - Page 34
    parts. Disconnect the fan cable from the connector on the system board [1]. 2. Remove the two (M2x3) screws in sequence (2 > 1) on the fan case and four (M2x3) screws in sequence (4 > 3 > 2 > 1) from the heatsink [2]. 3. Lift and remove the heatsink fan assembly from the computer [3]. 34 Removing
  • Dell Latitude 7400 | Service Manual - Page 35
    4. Remove the single screw securing the fan to heatsink. Installing the heatsink assembly 1. NOTE: Heatsink and Fan are separately orderable parts. Install the single screw securing the fan to the heatsink. Removing and installing components 35
  • Dell Latitude 7400 | Service Manual - Page 36
    2. Place the heatsink fan assembly in the computer [1]. 3. Replace the two (M2x3) screws in sequence (2 > 1) on fan case and four (M2x3) screws in sequence (4 > 3 > 2 > 1) on the heatsink fan assembly [1]. 4. Connect the fan cable to the system board [2]. 1. Install the WWAN card. 2. Install the
  • Dell Latitude 7400 | Service Manual - Page 37
    ) screw from the metal bracket on the power adapter port [1]. 2. Remove the metal bracket that secures the power adapter port [2]. 3. Disconnect the power adapter port cable from the system board [1]. 4. Lift and remove the power adapter port from its slot in the palmrest [2]. Installing the power
  • Dell Latitude 7400 | Service Manual - Page 38
    [1]. 4. Replace the single (M2x3) screw to secure the power adapter port to the palmrest assembly [2]. 1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Speakers Removing the speakers 1. Follow the
  • Dell Latitude 7400 | Service Manual - Page 39
    4. Remove the four (M2x3) screws securing the speakers to the palmrest assembly [1]. 5. Lift and remove the speakers from the palmrest assembly [2]. Removing and installing components 39
  • Dell Latitude 7400 | Service Manual - Page 40
    Installing the speakers 1. Align and place the speakers into the palmrest assembly [1]. 2. Replace the four (M2x3) screws to secure the speakers to the palmrest assembly [2]. 40 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 41
    3. Adhere the tape to secure the speaker cable on the touchpad button board [1]. 4. Route the speaker cable [2] and connect the speaker cable to the connector on the system board [3]. Removing and installing components 41
  • Dell Latitude 7400 | Service Manual - Page 42
    1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. LED Board Removing the LED daughterboard 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Disconnect the LED board ribbon
  • Dell Latitude 7400 | Service Manual - Page 43
    Installing the LED daughterboard 1. Align and place the LED daughterboard on the palmrest assembly [1]. 2. Replace the single (M2x3) screw securing the LED daughterboard to the palmrest assembly [2]. 3. Connect the LED daughterboard ribbon cable to the system board [3]. Removing and installing
  • Dell Latitude 7400 | Service Manual - Page 44
    1. Connect the speaker cable 2. Install the battery. 3. Install the base cover. 4. Follow the procedure after working inside your computer. Touchpad button board Removing the touchpad button board 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the
  • Dell Latitude 7400 | Service Manual - Page 45
    Installing the touchpad button board 1. Place the touchpad button board on the palmrest assembly [1]. 2. Replace the two (M2x2.5) screws to secure it to the palmrest assembly [2]. 3. Connect the touch pad button board cable to the touchpad module [3]. Removing and installing components 45
  • Dell Latitude 7400 | Service Manual - Page 46
    1. Install the speaker. 2. Install the battery. 3. Install the base cover. 4. Follow the procedure after working inside your computer. Smart card reader Removing the smart card reader 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4.
  • Dell Latitude 7400 | Service Manual - Page 47
    Installing the smart card reader 1. Replace the smart card reader into its slot on the palmrest assembly [1]. 2. Replace the four (M2x2.5) screws securing it to the palmrest assembly [2]. 3. Connect the touchpad button board cable to the touchpad module [3]. 4. Connect the smart card reader cable to
  • Dell Latitude 7400 | Service Manual - Page 48
    1. Install the speakers. 2. Install the SSD. 3. Install the battery. 4. Install the base cover. 5. Follow the procedure after working inside your computer. Display assembly Removing the display assembly 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3.
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    2. Remove the six (M2.5x4) screws [1] and remove the display assembly from the palmrest assembly [2]. Removing and installing components 49
  • Dell Latitude 7400 | Service Manual - Page 50
    Installing the display assembly 1. Replace the display assembly aligning the screw holes on the hinges with the screw holes on the palmrest assembly [1]. 2. Replace the six (M2.5x3.5) screws [2] to secure the display assembly to the computer [2]. 3. Close the LCD lid. 50 Removing and installing
  • Dell Latitude 7400 | Service Manual - Page 51
    1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Hinge caps Removing the hinge cap 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the display assembly. 1. Open
  • Dell Latitude 7400 | Service Manual - Page 52
    Installing the hinge cap 1. Slide the hinge cap towards the left hinge until it click locks on the display assembly [1]. 2. Close the hinges to 180 degrees to the display assembly [2]. 52 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 53
    1. Install the display assembly 2. Install the battery. 3. Install the base cover. 4. Follow the procedure after working inside your computer. Display Hinges Removing the hinges 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove
  • Dell Latitude 7400 | Service Manual - Page 54
    2. Remove the four (M2.5x5) screws [1] securing the hinges to the display assembly. 3. Lift and remove the hinges from the display back cover assembly [2]. 54 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 55
    Installing the hinges 1. Align and place the hinges on the display assembly [1]. 2. Replace the four (2.5x5) screws to secure hinges to the display back cover assembly [2]. Removing and installing components 55
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    3. Route the antennae and display cable along the hinges. 56 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 57
    1. Install the hinge cap 2. Install the display assembly 3. Install the battery. 4. Install the base cover. 5. Follow the procedure after working inside your computer. Display Bezel Removing the display bezel 1. Follow the procedure in before working inside your computer. 2. Remove the base cover.
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    1. Install the hinges. 2. Install the hinge cap 3. Install the display assembly 4. Install the battery. 5. Install the base cover. 6. Follow the procedure after working inside your computer. Display Panel Removing the display panel 1. Follow the procedure in before working inside your computer. 2.
  • Dell Latitude 7400 | Service Manual - Page 59
    2. NOTE: Do not pull and release the Stretch (SR) tapes from the display panel. There is no need to separate the brackets from the display panel. Peel back the tape [1] and flip open the latch [2] to disconnect the EDP cable from the display panel [3]. Removing and installing components 59
  • Dell Latitude 7400 | Service Manual - Page 60
    Installing the display panel 1. Connect the EDP cable to the connector on the display panel [1] and close the actuator to secure the connector [2]. 2. Adhere the adhesive tape over the EDP connector on the display panel [3] and flip over the display panel on the back cover [4]. 60 Removing and
  • Dell Latitude 7400 | Service Manual - Page 61
    1. Install the display bezel. 2. Install the hinges. 3. Install the hinge cap Removing and installing components 61
  • Dell Latitude 7400 | Service Manual - Page 62
    4. Install the display assembly 5. Install the battery. 6. Install the base cover. 7. Follow the procedure after working inside your computer. Camera-microphone module Removing the camera-microphone module 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3.
  • Dell Latitude 7400 | Service Manual - Page 63
    1. Install the display panel. 2. Install the hinges. 3. Install the display bezel. 4. Install the hinge cap 5. Install the display assembly 6. Install the battery. 7. Install the base cover. 8. Follow the procedure after working inside your computer. Display Cable Removing the display cable 1.
  • Dell Latitude 7400 | Service Manual - Page 64
    Installing the display cable 1. Adhere the display cable along the routing channel on the display back cover assembly [1] . 2. Connect the display cable to the camera microphone module and replace the tape on the connector [2]. 64 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 65
    the battery. 4. Remove the memory. 5. Remove the SSD. 6. Remove the WLAN card. 7. Remove the heatsink-fan assembly. 8. Remove the power adapter port. 9. Remove the display assembly. NOTE: System board can be removed with heatsink assembly installed, this simplifies the procedure in an event of power
  • Dell Latitude 7400 | Service Manual - Page 66
    3. Disconnect the display cable [1] and unroute it from the metal bracket on the system board [2]. 4. Remove the single (M2x4) screw [1] and remove the metal bracket over the WWAN Darwin antennae cable [2]. 5. Disconnect the power button (with finger print reader) cable from the system board [1].
  • Dell Latitude 7400 | Service Manual - Page 67
    7. Remove the two (M2x4) screws [1] and lift up the USB Type-C bracket from the system board [2]. 8. Disconnect the coin cell [1], speaker cable [2] and the LED daughterboard cable [3] from the system board. Removing and installing components 67
  • Dell Latitude 7400 | Service Manual - Page 68
    9. Disconnect the USH daughterboard [1] and touchpad cables [2] from the system board. 68 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 69
    10. Remove the two (M2x2.5) screws on the DDR ESD bracket [1] and lift to remove it from the system board [2]. 11. Remove the two (M2x4) screws [1] and remove the system board from the palmrest assembly [2]. NOTE: For models shipped with a fingerprint reader or WWAN antennas, there are three (M2x3)
  • Dell Latitude 7400 | Service Manual - Page 70
    Installing the system board 1. Align and place the system board in the palmrest assembly [1] 2. Replace the two (M2x4) screws on the system board securing it to the palmrest assembly [2]. 70 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 71
    NOTE: For models shipped with a fingerprint reader or WWAN antennas, there are three (M2x4) screws securing the system board to the computer. 3. Place the USB Type-C bracket [1] on the system board and secure it using two (M2x5) screws [2] to the system board. 4. Install the DDR ESD bracket [1] on
  • Dell Latitude 7400 | Service Manual - Page 72
    5. Open the latch and connect the USH board cable [1] and the touchpad cable [2] to the system board. 72 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 73
    6. Connect the coin cell [1], speaker cable [2], and the LED daughterboard ribbon cable [3] to the system board. 7. Install the metal bracket on the Darwin connector [1] and secure it to the palmrest using a single (M2x4) screw [2] to the system board. 8. Route the display cable through the metal
  • Dell Latitude 7400 | Service Manual - Page 74
    ) cable to the system board [1]. 11. Connect the Darwin WWAN antenna cables [2] to the the system board. 1. Install the display assembly 2. Install the power adapter port. 3. Install the heatsink-fan assembly. 74 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 75
    Remove the battery. 4. Remove the memory. 5. Remove the SSD. 6. Remove the WLAN card. 7. Remove the heatsink-fan assembly. 8. Remove the power adapter port. 9. Remove the speaker. 10. Remove the display assembly. 11. Remove the system board. 1. Remove the two (M2x2.5) screws, that secure the power
  • Dell Latitude 7400 | Service Manual - Page 76
    Figure 3. Power-button board without FPR 76 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 77
    Figure 4. Removing the power-button board with FPR Installing the power-button board 1. Align and place the power-button board in to its slot on the plamrest assembly [1]. 2. Replace the two (M2x2.5) screws to secure the power-button board to the palmrest assembly [2]. Removing and installing
  • Dell Latitude 7400 | Service Manual - Page 78
    Figure 5. Power-button board - without FPR 78 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 79
    to the system board. 1. Install the system board. 2. Install the touchpad buttons. 3. Install the display assembly 4. Install the power adapter port. 5. Install the heatsink-fan assembly. 6. Install the WLAN card. 7. Install the SSD. 8. Install the memory. 9. Install the battery. 10. Install
  • Dell Latitude 7400 | Service Manual - Page 80
    8. Remove the power adapter port. 9. Remove the display assembly. 10. Remove the system board. 11. Remove the coin cell. 12. Remove assembly from the palmrest [4]. 3. Remove the five (M2x2) screws [1] to lift the keyboard from the keyboard support plate. 80 Removing and installing components
  • Dell Latitude 7400 | Service Manual - Page 81
    be pushed down firmly at the snap points in order to secure and fit it to the replacement keyboard. Align the keyboard to the keyboard support plate [1] and replace the two (M2x2) screws [2]. 2. Place the keyboard assembly in the palmrest [1] and secure it with the 17 (M1.6x2) screws [2]. NOTE
  • Dell Latitude 7400 | Service Manual - Page 82
    1. Install the power button. 2. Install the coin cell. 3. Install the system board. 4. Install the display assembly 5. Install the power adapter port. 6. Install the heatsink-fan assembly. 7. Install the WLAN card. 8. Install the SSD. 9. Install the memory. 10. Install the battery. 11. Install the
  • Dell Latitude 7400 | Service Manual - Page 83
    the coin cell. 4. Install the system board. 5. Install the display assembly 6. Install the speaker. 7. Install the LED board. 8. Install the power adapter port. 9. Install the heatsink-fan assembly. 10. Install the WLAN card. 11. Install the SSD. 12. Install the memory. 13. Install the battery. 14
  • Dell Latitude 7400 | Service Manual - Page 84
    are any issues, error codes are displayed. Note the error code and validation number and contact Dell. System diagnostic lights Battery-status light Indicates the power and battery-charge status. Solid white - power and battery-status light patterns and associated problems. 84 Troubleshooting
  • Dell Latitude 7400 | Service Manual - Page 85
    Go to www.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 browse for your computer model. 4. Click Drivers & downloads > Find it myself. Troubleshooting 85
  • Dell Latitude 7400 | Service Manual - Page 86
    instructions on the screen. Backup media and recovery options It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell procedure provides the instructions on how to conduct a WiFi power cycle: NOTE: Some ISPs (Internet Service Providers) provide
  • Dell Latitude 7400 | Service Manual - Page 87
    options. Availability varies by country and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues: 1. Go to Dell.com/support. 2. Select your support category. 3. Verify your country or region in the Choose a Country
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Dell Latitude 7400
Service Manual
Regulatory Model: P100G
Regulatory Type: P100G001