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Dell Latitude 7400 Service Manual

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Dell Latitude 7400
Service Manual
Regulatory Model: P100G
Regulatory Type: P100G001

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Summary of Contents for Dell Latitude 7400

  • Page 1 Dell Latitude 7400 Service Manual Regulatory Model: P100G Regulatory Type: P100G001...
  • Page 2 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 trademarks of their respective owners.

  • Page 3: Table Of Contents

    Contents 1 Working on 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 sensitive components..........................8 After working inside your computer..........................9 2 Technology and components......................10 USB features..................................
  • Page 4 Installing the power adapter port..........................37 Speakers....................................38 Removing the speakers..............................38 Installing the speakers..............................40 LED Board.................................... 42 Removing the LED daughterboard..........................42 Installing the LED daughterboard..........................43 Touchpad button board..............................44 Removing the touchpad button board........................44 Installing the touchpad button board.......................... 45 Smart card reader................................
  • Page 5 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...

  • Page 6: Working On Your Computer

    Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.

  • Page 7: Safety Precautions

    Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

  • Page 8: Esd Field Service Kit

    Transporting sensitive components When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.

  • Page 9: After Working Inside Your Computer

    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 inside your computer After you complete any replacement procedure, ensure that you connect any external devices, cards, and cables before turning on your computer.

  • Page 10: Technology And Components

    Technology and components This chapter details the technology and components available in the system. Topics: • USB features • USB Type-C • HDMI 1.4a USB features Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers.

  • Page 11: Usb Type-C

    • USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a 10-fold increase in theoretical bandwidth. With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices, high megapixel count digital cameras etc., USB 2.0 may not be fast enough.
  • Page 12 “alternate modes,” which allows you to have adapters that can output HDMI, VGA, DisplayPort, or other types of connections from that single USB port USB Power Delivery The USB PD specification is also closely intertwined with USB Type-C. Currently, smartphones, tablets, and other mobile devices often use a USB connection to charge.

  • Page 13: Hdmi 1.4A

    5. Up to 40 Gbps NOTE: Data transfer speed may vary between different devices. Thunderbolt Icons Figure 2. Thunderbolt Iconography Variations HDMI 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, or A/V receiver and a compatible digital audio and/or video monitor, such as a digital TV (DTV).

  • Page 14: Major Components Of Your System

    Major components of your system 1. Base cover 2. Power adaptor port Major components of your system...
  • Page 15 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 purchased by the customer. Contact your Dell sales representative for purchase options.

  • Page 16: Removing And Installing Components

    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 hinges [1]. 3.
  • Page 17 4. Lift and remove the base cover from the computer. Removing and installing components...

  • Page 18: Installing The Base Cover

    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. Removing and installing components...
  • Page 19 3. Tighten the eight captive screws to secure the base cover to the computer. Removing and installing components...

  • Page 20: Battery

    If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing, bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See www.dell.com/contactdell.

  • Page 21: Installing The Battery

    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.

  • Page 22: Coin Cell

    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 system board [1]. 2.
  • 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...

  • Page 24: Installing The Coin Cell

    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]. Removing and installing components...
  • Page 25 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...

  • Page 26: Memory

    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.

  • Page 27: Solid State Drive

    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.
  • Page 28 3. Slightly lift and remove the SSD out from its connector on the system board. Removing and installing components...

  • Page 29: Installing The Solid State Drive

    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 and installing components...

  • Page 30: Wlan Card

    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.

  • Page 31: Installing The Wlan Card

    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.

  • Page 32: Wwan Card

    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.

  • Page 33: Installing The Wwan Card

    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.

  • Page 34: Heatsink

    1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Heatsink Removing the heatsink fan assembly 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4.

  • Page 35: Installing The Heatsink Assembly

    4. Remove the single screw securing the fan to heatsink. Installing the heatsink assembly NOTE: Heatsink and Fan are separately orderable parts. Install the single screw securing the fan to the heatsink. Removing and installing components...
  • 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].

  • Page 37: Power Adapter Port

    Power adapter port Removing the power adapter port 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 from the metal bracket on the power adapter port [1]. 2.

  • Page 38: Speakers

    3. Replace the metal bracket over the power adapter port [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.
  • 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...

  • Page 40: Installing The Speakers

    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]. Removing and installing components...
  • 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...

  • Page 42: Led Board

    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.

  • Page 43: Installing The Led Daughterboard

    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 components...

  • Page 44: Touchpad Button Board

    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.

  • Page 45: Installing The Touchpad Button Board

    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...

  • Page 46: Smart Card Reader

    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.

  • Page 47: Installing The Smart Card Reader

    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.

  • Page 48: Display Assembly

    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.
  • Page 49 2. Remove the six (M2.5x4) screws [1] and remove the display assembly from the palmrest assembly [2]. Removing and installing components...

  • Page 50: Installing The Display Assembly

    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.

  • Page 51: Hinge Caps

    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.

  • Page 52: Installing The Hinge Cap

    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]. Removing and installing components...

  • Page 53: Display Hinges

    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.
  • 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]. Removing and installing components...

  • Page 55: Installing The Hinges

    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...
  • Page 56 3. Route the antennae and display cable along the hinges. Removing and installing components...

  • Page 57: Display Bezel

    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.

  • Page 58: Display Panel

    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.
  • Page 59 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...

  • Page 60: Installing The Display Panel

    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]. Removing and installing components...
  • Page 61 1. Install the display bezel. 2. Install the hinges. 3. Install the hinge cap Removing and installing components...

  • Page 62: Camera-Microphone Module

    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.

  • Page 63: Display Cable

    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.

  • Page 64: Installing The Display Cable

    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]. Removing and installing components...

  • Page 65: System Board

    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.
  • 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]. 6.
  • 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...
  • Page 68 9. Disconnect the USH daughterboard [1] and touchpad cables [2] from the system board. Removing and installing components...
  • 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) screws securing the system board to the computer.

  • Page 70: Installing The System Board

    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]. Removing and installing components...
  • 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.
  • Page 72 5. Open the latch and connect the USH board cable [1] and the touchpad cable [2] to the system board. Removing and installing components...
  • 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.
  • Page 74 9. Install the display cable bracket [1] on the EDP connector of the system board and secure it using a single (M2x3) screw [2]. 10. Connect the power button (with finger print reader) cable to the system board [1]. 11. Connect the Darwin WWAN antenna cables [2] to the the system board. 1.

  • Page 75: Power-Button Board

    4. Install the WLAN card. 5. Install the SSD. 6. Install the memory. 7. Install the battery. 8. Install the base cover. 9. Follow the procedure after working inside your computer. Power-Button Board Removing the power-button board 1. Follow the procedure in before working inside your computer.
  • Page 76 Figure 3. Power-button board without FPR Removing and installing components...

  • Page 77: Installing The Power-Button Board

    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 components...
  • Page 78 Figure 5. Power-button board - without FPR Removing and installing components...

  • Page 79: Keyboard

    Figure 6. Installing the power-button board with FPR NOTE: Power-button board with finger print reader, has a cable that connects 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.
  • 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 the power-button board. 1. Lift the latch and disconnect the keyboard cable [1] and the backlight cable [2] from the touchpad module. NOTE: This image shows disassembly of a carbon fiber variant, an Aluminum variant of this model has 21 M1.6x2 screws securing the keyboard assembly to palmrest.

  • Page 81: Installing The Keyboard

    Installing the keyboard NOTE: The keyboard has multiple snap points on the lattice side which must 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.

  • Page 82: Palmrest

    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.
  • Page 83 12. Remove the touchpad buttons. 13. Remove the system board. 14. Remove the coin cell. 15. Remove the power button. 16. Remove the keyboard. 1. After removing these components, you are left with the palmrest assembly. 2. Install the following components to the new palmrest assembly: 1.

  • Page 84: Troubleshooting

    Running the ePSA diagnostics 1. Turn on your computer. 2. As the computer boots, press the F12 key as the Dell logo appears. 3. On the boot menu screen, select the Diagnostics option. 4. Click the arrow at the bottom left corner.

  • Page 85: Flashing Bios (Usb Key)

    4. Connect the bootable USB drive to the computer that needs the BIOS update. 5. Restart the computer and press F12 when the Dell logo is displayed on the screen. 6. Boot to the USB drive from the One Time Boot Menu.

  • Page 86: 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 Dell Windows Backup Media and Recovery Options.

  • Page 87: Getting Help

    Dell product catalog. Dell provides several online and telephone-based support and service 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.

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