Dell Latitude 7400 2-in-1 Service Manual
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Dell Latitude 7400 2-in-1 Service Manual

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Dell Latitude 7400 2-in-1
Service Manual
Regulatory Model: P110G
Regulatory Type: P110G001

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Summary of Contents for Dell Latitude 7400 2-in-1

  • Page 1 Dell Latitude 7400 2-in-1 Service Manual Regulatory Model: P110G Regulatory Type: P110G001...
  • 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..........................5 Safety instructions................................5 Turning off your computer — Windows 10........................5 Before working inside your computer..........................6 After working inside your computer..........................6 2 Technology and components..........................7 USB features..................................7 USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB)......................7 Speed.....................................8 Applications...................................8 Compatibility.................................
  • Page 4 Enhanced Pre-Boot System Assessment (ePSA) diagnostics...................98 Running the ePSA diagnostics..........................98 System diagnostic lights..............................98 Flashing BIOS (USB key)..............................99 Flashing the BIOS................................100 Backup media and recovery options..........................100 WiFi power cycle................................100 Flea power release................................100 5 Getting help..............................101 Contacting Dell................................101 Contents...

  • Page 5: 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 6: Before Working Inside Your Computer

    Before working inside your computer About this task To avoid damaging your computer, perform the following steps before you begin working inside the computer. Steps Ensure that you follow the Safety Instruction. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched. Turn off your computer.

  • Page 7: 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 • Corning Gorilla Glass 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 8: Speed

    Speed Currently, there are 3 speed modes defined by the latest USB 3.0/USB 3.1 Gen 1 specification. They are Super-Speed, Hi-Speed and Full- Speed. The new SuperSpeed mode has a transfer rate of 4.8Gbps. While the specification retains Hi-Speed, and Full-Speed USB mode, commonly known as USB 2.0 and 1.1 respectively, the slower modes still operate at 480Mbps and 12Mbps respectively and are kept to maintain backward compatibility.

  • Page 9: Compatibility

    • USB 3.0/USB 3.1 Gen 1 RAIDs • Optical Media Drives • Multimedia Devices • Networking • USB 3.0/USB 3.1 Gen 1 Adapter Cards & Hubs Compatibility The good news is that USB 3.0/USB 3.1 Gen 1 has been carefully planned from the start to peacefully co-exist with USB 2.0. First of all, while USB 3.0/USB 3.1 Gen 1 specifies new physical connections and thus new cables to take advantage of the higher speed capability of the new protocol, the connector itself remains the same rectangular shape with the four USB 2.0 contacts in the exact same location as before.

  • Page 10: Thunderbolt Over Usb Type-C

    underlying technology could just be USB 2 or USB 3.0. In fact, Nokia's N1 Android tablet uses a USB Type-C connector, but underneath it's all USB 2.0 — not even USB 3.0. However, these technologies are closely related. Thunderbolt over USB Type-C Thunderbolt is a hardware interface that combines data, video, audio, and power in a single connection.

  • Page 11: Thunderbolt Icons

    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 12: Benefits

    native damage resistance allowing improved in-field performance. Corning Gorilla Glass 5 has been tested for performance when subjected to sharp contact damage, such as asphalt and other real-world surfaces. Benefits • Enhanced retained strength after use. • High resistance to scratch and sharp contact damage. •...
  • Page 13 596 kgf/mm Fracture Toughness 0.69 MPa m Coefficient of Expansion (0 ˚C - 300 ˚C) 78.8 x 10 /°C Chemical Strengthening Capability of >850MPa CS, at 50 µm Depth Of Layer(DOL) Specifications subject to change Optical Table 4. Optical Refractive Index (590 nm) Core glass** 1.50 Compression layer...
  • Page 14 Frequency (MHz) Dielectric Constant Loss Tangent 7.97 0.011 7.01 0.012 1499 6.99 0.012 1977 6.97 0.014 2466 6.96 0.014 2986 6.96 0.014 Terminated coaxial line similar to that outlined in NIST Technical Notes 1520 and 1355-R Putting Corning Gorilla Glass 5 to the test. •...

  • Page 15: Removing And Installing Components

    The #0 screw driver is for screws 0-1 and the #1 screw driver is for screws 2-4. Screw List The following table shows the screw list and the images for Dell Latitude 7400 2-in-1, for different components and locations. Table 7. Screw Size List...

  • Page 16: Sd Memory Card

    Component Screw type Quantity Image • M2x3 • • • Keyboard M1.6x1.5 • • • SD memory card Removing the SD memory card Press the SD memory card to eject it from the SD memory card slot [1]. Remove the SD memory card from the computer [2]. Installing the SD memory card Insert the SD memory card into its slot [1] until it clicks into place [2].

  • Page 17: Sim Card Tray

    SIM card tray Removing the SIM card tray NOTE: This procedure applies for models that are shipped with WWAN card only. Insert a paperclip or a SIM card removal tool into the pinhole on the SIM card tray [1]. Push the pin to disengage the lock and eject the SIM card tray [2]. Pull the SIM card tray out of the computer [3].

  • Page 18: Installing The Sim Card Tray

    Installing the SIM card tray Install the SIM card tray into its slot on the computer [1] and push to lock it in place [2]. Removing and installing components...

  • Page 19: Base Cover

    Base cover Removing the base cover Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card. Steps Loosen the 10 captive screws that secure the base cover to the computer. Removing and installing components...
  • Page 20 Use a plastic scribe [1] to pry the base cover along the recess points located in the hinge indents (left and right) [1]. Pry the base cover along the edges [2] to separate the base cover from the computer [2]. CAUTION: Do not pull on the base cover from the top side immediately after prying it open from the recesses as it can damage the base cover.
  • Page 21 Lift the base cover off the computer. Removing and installing components...

  • Page 22: Installing The Base Cover

    Installing the base cover Steps Align the base cover and place it on the computer. Removing and installing components...
  • Page 23 Press along the edges of the base cover until it clicks into place. Removing and installing components...
  • Page 24 Tighten the 10 captive screws to secure the base cover to the computer. Removing and installing components...

  • Page 25: Battery Cable

    Next steps Install the SD memory card. Follow the procedure in after working inside your computer. Battery cable Disconnecting the battery cable Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card. Remove the base cover.

  • Page 26: Connecting The Battery Cable

    Connecting the battery cable Step Connect the battery cable to the connector on the system board. Removing and installing components...

  • Page 27: Coin Cell Battery

    Next steps Install the base cover. Install the card. Install the SD memory card. Follow the procedure in after working inside your computer. Coin cell battery Removing the coin cell battery Prerequisites Follow the procedure in before working inside your computer.

  • Page 28: Installing The Coin-Cell Battery

    Installing the coin-cell battery Steps Affix the coin-cell battery to the system [1]. Connect the coin-cell battery cable to the connector on the system board [2]. Removing and installing components...

  • Page 29: Solid State Drive

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. Solid state drive Removing the solid state drive Prerequisites Follow the procedure in before working inside your computer.
  • Page 30 Remove the single (M2x2) screw [1] that secures the SSD shield to the system board. Lift to remove the SSD shield from the system board [2]. Removing and installing components...
  • Page 31 Slide and remove the SSD module from the connector on the system board. Removing and installing components...

  • Page 32: Installing The Solid State Drive

    Installing the solid state drive Steps Align and slide the solid state drive (SSD) module into the connector on the system board. Removing and installing components...
  • Page 33 Place the SSD shield on the SSD module [1] and replace the single (M2x2) screw [2] to secure it to the system board. Removing and installing components...
  • Page 34 Affix the black tape [1] and the metal foil [2] to secure the SSD shield in place. Removing and installing components...

  • Page 35: Wlan Card

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. WLAN card Removing the WLAN card Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.

  • Page 36: Installing The Wlan Card

    Installing the WLAN card Steps Slide the WLAN card [1] at an angle into the WLAN card connector on the system board. Connect the WLAN antenna card cables [2] to the connector on the WLAN card. Align the screw hole on the WLAN card bracket with the screw hole on the WLAN card [3]. Replace the single (M2x2) [4] screw to secure the WLAN card to the system board.

  • Page 37: Wwan Card

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. WWAN card Removing the WWAN card Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.
  • Page 38 Remove the single (M2x3) screw [1] that secures the WWAN bracket to the WWAN card. Remove the WWAN bracket [2] from the WWAN card. Disconnect the wireless antennae cables [3] from the connectors on the WWAN card. Slide and remove the WWAN card [4] from the connector on the system board. Removing and installing components...

  • Page 39: Installing The Wwan Card

    Installing the WWAN card Steps Slide the WWAN card [1] at an angle into the WWAN card connector on the system board. Connect the WWAN antenna cables [2] to the connector on the WWAN card. Align the screw hole on the WWAN card bracket with the screw hole on the WWAN card [3]. Replace the single (M2x2) screw [4] to secure the WWAN card to the system board.
  • Page 40 Place the metal shield on the WWAN card. Removing and installing components...

  • Page 41: Fan

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. Removing the fan Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.
  • Page 42 Disconnect the fan cable [1] from the connector on the system board [1]. Partially peel off the metal foil [2] and the black tape [3] on the SSD shield. Removing and installing components...
  • Page 43 Remove the single (M2x2) screw [1] that secures the WWAN P-sensor bracket to the system board. Remove the WWAN P-sensor bracket [2] from the system board. Removing and installing components...
  • Page 44 Partially peel off the padded gasket [1] from the fan case. Remove the single (M2x2) screw [2] that secures the fan to the system board. Removing and installing components...
  • Page 45 CAUTION: There are cushions, partially obstructing the palmrest, on the bottom side of the fan. Technicians should not lift the fan directly up, as it may damage the fan. Partially lift the left side of the fan and slide it to the left to remove it from the computer. Removing and installing components...

  • Page 46: Installing The Fan

    Installing the fan Steps Slide the fan at an angle into its slot on the system board. Removing and installing components...
  • Page 47 Replace the single (M2x2) screw [1] to secure the fan to the system board. Adhere the padded rubber gasket [2] on the fan case. Removing and installing components...
  • Page 48 Align the screw holes on the WWAN P-sensor bracket [1] with the screw hole on the fan. Replace the single (M2x2) screw [2] to secure the WWAN P-sensor bracket to the fan. Removing and installing components...
  • Page 49 Connect the fan cable [1] to the connector on the system board. Adhere the black tape [2] and the metal foil [3] partially covering the SSD shield. Removing and installing components...
  • Page 50 Adhere the Mylar sheet on the system board. Removing and installing components...

  • Page 51: Speakers

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. Speakers Removing the speakers Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.
  • Page 52 Remove the three (M1.6x1.4) screws [1] that secure the speakers to the system board and lift the speakers off the computer [2]. Removing and installing components...

  • Page 53: Installing The Speakers

    Installing the speakers Steps Align the screw holes on the speakers [1] with the screw holes on the chassis Replace the three (M1.6x1.4) screws [2] that secure the speakers to the chassis. Removing and installing components...
  • Page 54 Connect the speaker cable [1] to the connector on the system board and adhere the speaker flex cable [2] on the battery. Removing and installing components...

  • Page 55: Heatsink

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. Heatsink Removing the heatsink Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.
  • Page 56 Remove the metal foil from the heatsink shield. Removing and installing components...
  • Page 57 Remove the heatsink shield from the system board. Removing and installing components...
  • Page 58 Remove the four (M1.6x2.5) screws [1] that secure the heatsink on the system board. Lift the heatsink [2] off the system board. Removing and installing components...

  • Page 59: Installing The Heatsink

    Installing the heatsink Steps Align the screw holes on the heatsink [1] with the screw holes on the system board. Replace the four (M1.6x2.5) screws [2] that secure the heatsink to the system board. Removing and installing components...
  • Page 60 Place the heatsink shield on the heatsink. Removing and installing components...
  • Page 61 Adhere the metal foils on the heatsink shield. Removing and installing components...
  • Page 62 Adhere the camera and touch screen FPC cables on the heatsink shield [1]. Connect the camera and touch screen FPC cables [2] to the connector on the system board. Adhere the Mylar sheet [3] on the system board. Removing and installing components...

  • Page 63: Display Assembly

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. Display assembly Removing the display assembly Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.
  • Page 64 Peel off the tape on the display cable [1]. Pry the retention clips on both sides and flip open the latch [2]. CAUTION: The connector for the display cable features a latch that locks it in place on the system board which technicians must flip open in order to disconnect the display cable from the system board.
  • Page 65 Remove the six (M2.5x3.5) screws [1] that secures the display hinges to the computer. Lift the display assembly off the computer [2]. Removing and installing components...

  • Page 66: Installing The Display Assembly

    Installing the display assembly Steps Install the display assembly with hinges open at 180º aligned to the computer [1]. Replace the six (M2.5x3.5) screws [1] that secures the display hinges to the computer [2]. Removing and installing components...
  • Page 67 Connect the display cable [1] to the connector on the system board. Close the latch [2] and adhere the tape on the display cable [3]. Removing and installing components...
  • Page 68 Route the camera and touch screen FPC and adhere it on the heatsink shield [1]. Connect the camera and touch screen FPC to the connector on the system board [2] and stick the Mylar sheet on the system board [3]. Removing and installing components...

  • Page 69: Battery

    If a battery gets stuck in a device as a result of swelling, do not try to free it as puncturing, bending, or crushing a Lithium-ion battery can be dangerous. In such an instance, the entire system should be replaced. Contact https://www.dell.com/support assistance and further instructions. • Always purchase genuine batteries from https://www.dell.com or authorized Dell partners and re-sellers. Removing and installing components...

  • Page 70: Removing The Battery

    Removing the battery Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card. Remove the base cover. Disconnect the battery cable. Remove the speakers. Steps Peel off the tape [1] and unroute the wireless antennae cables from the routing guides on the battery [2]. NOTE: The cables for the wireless antennas are routed over the plastic bracket at the top left corner and within the routing channels along the left and bottom side of the battery.
  • Page 71 Figure 3. 4-cell battery NOTE: A 6-cell battery has an extra M2x4 screw shown in green. Remove the screw before removing the battery from the computer. Table 8. Battery screw description Size Amount 4-cell battery Yellow M2x3L M1.6x4.5L 6-cell battery Green M2x4L Removing and installing components...

  • Page 72: Installing The Battery

    Figure 4. 6-cell battery Installing the battery Steps Align the screw holes on the battery with the screw holes on the palmrest assembly [1]. Replace the four (M2x3) screws and single (M1.6x4.5) screw that secure the battery to the palmrest assembly [2]. Removing and installing components...
  • Page 73 NOTE: Install the extra M2x4 screw for 6-cell battery. The screw is shown in green, in the battery disassembly section. Stick the tape on wireless antennae cable securing it to the battery [1]. Thread the antennae cables along the routing channels and supporting bracket on the battery [2]. Removing and installing components...
  • Page 74 Connect the battery cable to the system board. Removing and installing components...

  • Page 75: System Board

    Next steps Connect the battery cable Install the base cover. Install the SD memory card. Follow the procedure in after working inside your computer. System board Removing the system board Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card.
  • Page 76 Remove the battery. Steps Disconnect the coin cell cable from the system board [1] and remove the coin cell from the system board [2]. Peel off the tape on the display cable connector of the system board [3]. Pry the retention clips on both sides of the display cable connector, to flip open the latch [4]. CAUTION: The connector for the display cable features an actuator that locks it in place on the system board.
  • Page 77 Remove the single (M2x2) screw [1] securing the power fingerprint bracket to system board. Remove the power fingerprint bracket [2] and disconnect the cable from the system board [3]. Disconnect the LTE P-sensor and isolator antenna cables [4] from the system board. Disconnect the LTE MAIN and AUX antennae cables [5] from the system board.
  • Page 78 Remove the single (M2x2) screw [1] and remove the SSD bracket from the system board [2]. Remove the two (M2x4) screws [3] and remove the USB Type-C bracket [4] from the system board. Removing and installing components...
  • Page 79 CAUTION: For models shipped with no LTE support, the dummy SIM card tray must first be removed from the system before removing the system board. Remove the five (M2x3) screws [1] and remove the system board from the computer [2]. Removing and installing components...

  • Page 80: Installing The System Board

    Installing the system board Steps Install the system board in the computer [1] and install the five (M2x3) screws securing it to the computer. Removing and installing components...
  • Page 81 Install the USB Type-C bracket [1] on the system board and secure it using two (M2x4) screws [2] on the system board. Install the SSD bracket [3] and secure it using a single (M2x2) screw [4] to the system board. Removing and installing components...
  • Page 82 Connect the Power button/fingerprint reader cable to the system board [1]. Install the power button/finger print reader bracket [2] on the system board and secure it using the single (M2x2) screw [3]. Connect the LTE P-sensor and isolator antenna cables [4] on the system board. Connect the LTE MAIN and AUX antennae cables [5] on the system board.
  • Page 83 Connect the following power button cable to the system board [1]. Connect the USH board cable [2] and keyboard with backlight cable [3] to the system board. Connect the touchpad cable [4] and LED board cable [5] to the system board. Removing and installing components...
  • Page 84 Install the coin cell [1] on the system board and connect its cable to the system board [2]. Connect the display cable to the system board [3] and flip close the actuator [4]. Secure the display cable connector by sticking the tape on the system board [5]. Removing and installing components...
  • Page 85 Next steps Install the battery. Install the heatsink Install the speaker. Install the fan. Install the WWAN card. Install the WLAN card. Install the SSD. Install the coin cell Connect the battery cable Install the base cover. Install the SIM card Install the SD memory card.

  • Page 86: Keyboard

    Keyboard Removing the keyboard Prerequisites Follow the procedure in before working inside your computer. Remove the SD memory card. Remove the base cover. Disconnect the battery cable. Remove the coin cell. Remove the SSD. Remove the WLAN card. Remove the WWAN card.
  • Page 87 Disconnect the smartcard reader FPC from the USH board [4] and peel off the FPC cable from the keyboard [5]. Remove the two (M1.6x1.5) screws [1] to remove the middle battery bracket [2] from the computer. Peel off the keyboard and backlight FPC cables from the keyboard [3]. Remove the single (M1.6x1.5) screw [4] to remove the left battery bracket [5] from the computer.
  • Page 88 Remove the 40 (M1.6x1.5) screws that secure the keyboard to the palmrest assembly. Removing and installing components...
  • Page 89 Lift the keyboard off the palmrest assembly. Removing and installing components...

  • Page 90: Installing The Keyboard

    Installing the keyboard Steps Place the keyboard on the palmrest assembly. Removing and installing components...
  • Page 91 Replace the 40 (M1.6x1.5) screws on the keyboard to secure it to the palmrest assembly. Removing and installing components...
  • Page 92 Install the middle battery bracket [1] and secure it using two (M1.6x1.5) screws [2]. Stick the keyboard and backlight FPC cables to the keyboard [3]. Install left battery bracket [4] and secure it using single (M1.6x1.5) screw [5]. Removing and installing components...
  • Page 93 Stick the two pieces of LTE antenna module copper foil [1, 3] and LTE AUX cable on the keyboard [2]. Route and stick the smart card FPC cable [4] on the keyboard and connect it to the USH board [5]. Removing and installing components...
  • Page 94 Stick the USH board cable [1], touchpad cable [2], and LED board cable [3] on the keyboard base. Removing and installing components...

  • Page 95: Palmrest Assembly

    Next steps Install the system board Install the battery. Install the heatsink Install the speaker. Install the fan. Install the WWAN card. Install the WLAN card. Install the SSD. Install the coin cell Connect the battery cable Install the base cover.
  • Page 96 Remove the coin cell. Remove the SSD. Remove the WLAN card. Remove the WWAN card. Remove the fan. Remove the speakers. Remove the heatsink. Remove the display assembly. Remove the battery. Remove the system board. Remove the keyboard. Steps After performing the preceding steps, you are left with palmrest assembly. NOTE: Please refer to order details for exact specifics of sub-components defined in the palmrest assembly.
  • Page 97 Install the WWAN card. Install the WLAN card. Install the SSD. Install the coin cell Connect the battery cable Install the base cover. Install the SIM card Install the SD memory card. Follow the procedure after working inside your computer. Removing and installing components...

  • Page 98: Troubleshooting

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

  • Page 99: Flashing Bios (Usb Key)

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

  • Page 100: Flashing The Bios

    Double-click the BIOS update file icon and follow the instructions on the screen. Backup media and recovery options 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 101: Getting Help

    About this task 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: Steps Go to Dell.com/support.

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