Dell Latitude 7455 Owner's Manual
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Dell Latitude 7455 Owner's Manual

Dell Latitude 7455 Owner's Manual

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Latitude 7455
Owner's Manual
Regulatory Model: P190G
Regulatory Type: P190G001
June 2024
Rev. A00

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Summary of Contents for Dell Latitude 7455

  • Page 1 Latitude 7455 Owner's Manual Regulatory Model: P190G Regulatory Type: P190G001 June 2024 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2024 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, 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 Chapter 1: Views of Latitude 7455....................7 Right......................................7 Left......................................7 Top......................................8 Front....................................... 9 Bottom....................................10 Locate the Service Tag or Express Service Code label of your computer............10 Battery charge and status light ............................11 Chapter 2: Set up your Latitude 7455...................12 Chapter 3: Specifications of Latitude 7455..................
  • Page 4 Recommended tools................................. 32 Screw list.....................................32 Major components of Latitude 7455 (computers shipped with WLAN-only support)........33 Major components of Latitude 7455 (computers shipped with WWAN support)..........35 Chapter 5: Removing and installing Customer Replaceable Units (CRUs)........38 SIM card....................................38 Removing the SIM card (for computers shipped with WWAN support)............38 Installing the SIM card (for computers shipped with WWAN support)............
  • Page 5 Removing the coin-cell battery..........................70 Installing the coin-cell battery........................... 71 I/O-board cable..................................72 Removing the I/O-board cable (for computers shipped with WLAN-only support)........72 Installing the I/O-board cable (for computers shipped with WLAN-only support)........74 Removing the I/O board cable (for computers shipped with WWAN support)...........75 Installing the I/O-board cable (for computers shipped with WWAN support)..........77 I/O-board FPC cable................................
  • Page 6 Clearing chassis intrusion alert.............................136 Chapter 9: Troubleshooting....................... 139 Handling swollen rechargeable Li-ion batteries......................139 Locating the Service Tag or Express Service Code of your Dell computer ............. 139 Dell SupportAssist Pre-boot System Performance Check diagnostics.............. 140 Running the SupportAssist Pre-Boot System Performance Check.............. 140 Built-in self-test (BIST)..............................140...

  • Page 7: Chapter 1: Views Of Latitude 7455

    NOTE: You can connect a Dell docking station to one of the two USB Type-C ports. If your docking station has two cables, do not connect both cables to the two USB Type-C ports simultaneously. You may encounter issues with the charging circuits when this method of connection is used.

  • Page 8: Top

    NOTE: You can customize the power-button behavior in Windows. 2. Speakers Provide audio output. 3. Touchpad Move your finger on the touchpad to move the mouse pointer. Tap to left-click and two fingers tap to right-click. Views of Latitude 7455...

  • Page 9: Front

    Turns on when the camera is in use. 7. Right microphone Provides digital sound input for audio recording and voice calls. 8. Ambient-light sensor The sensor detects the ambient light and automatically adjusts the display brightness. Views of Latitude 7455...

  • Page 10: Bottom

    The service tag is a unique alphanumeric identifier that allows Dell service technicians to identify the hardware components in your computer and access warranty information. The Express Service Code is a numeric version of the Service Tag. For more...

  • Page 11: Battery Charge And Status Light

    Figure 6. Service Tag/Express Service Code location Battery charge and status light The following table lists the battery charge and status light behavior of your Latitude 7455. Table 1. Battery charge and status light behavior  Power Source LED Behavior System Power State...

  • Page 12: Chapter 2: Set Up Your Latitude 7455

    2. Finish the operating system setup. Follow the on-screen instructions to complete the setup. When setting up, Dell Technologies recommends that you: ● Connect to a network for Windows updates.
  • Page 13 SupportAssist proactively checks the health of your computer hardware and software. When an issue is detected, the necessary system state information is sent to Dell to begin troubleshooting. SupportAssist is preinstalled on most of the Dell devices running the Windows operating system. For...

  • Page 14: Chapter 3: Specifications Of Latitude 7455

    ● 1.44 kg (3.18 lb) - for computers shipped with WWAN variability. support Processor The following table lists the details of the processors that are supported for your Latitude 7455. Table 4. Processor  Description Option one Option two...

  • Page 15: Chipset

    Up to 45 TOPS Up to 45 TOPS Integrated graphics Qualcomm Adreno Graphics Qualcomm Adreno Graphics Chipset The following table lists the details of the chipset that is supported in your Latitude 7455. Table 5. Chipset  Description Option one Option two Processors...

  • Page 16: Memory

    Memory The following table lists the memory specifications of your Latitude 7455. Table 6. Memory specifications  Description Values Memory slots Onboard memory NOTE: The memory is integrated on the system board and is not upgradeable. Memory type LPDDR5x Memory speed...

  • Page 17: Internal Slots

    M.2 cards, search in the Knowledge Base Resource at Dell Support Site. Wireless module The following table lists the Wireless Local Area Network (WLAN) module that is supported on your Latitude 7455. Table 9. Wireless module specifications  Description Values Model number...

  • Page 18: Wwan Module

    WWAN module The following table lists the Wireless Wide Area Network (WWAN) module supported on your Latitude 7455. NOTE: The WWAN module is only available on computers that are manufactured with the WWAN (Cellular Internet) capability. WWAN capability cannot be added to the computer after purchase.

  • Page 19: Audio

    For instructions on how to find your computer's International Mobile Equipment Identity (IMEI) number, search in the Knowledge Base Resource at Dell Support Site. Audio The following table lists the audio specifications of your Latitude 7455. Table 11. Audio specifications  Description Values Audio controller...

  • Page 20: Media-Card Reader

    Media-card reader The following table lists the media cards that are supported on your Latitude 7455. Table 13. Media-card reader specifications  Description Values Media-card type One microSD-card slot Media-cards supported ● Micro Secure Digital (mSD) ● Micro Secure Digital High Capacity (mSDHC) ●...

  • Page 21: Keyboard Function Keys Of Latitude 7455

    Keyboard function keys of Latitude 7455 NOTE: Keyboard characters may differ depending on the keyboard language configuration. Keys that are used for shortcuts remain the same across all language configurations. Some keys on your keyboard have two symbols on them. These keys can be used to type alternate characters or to perform secondary functions.

  • Page 22: Camera

    Home (move to the beginning of the document) fn + right arrow End (move to the end of the document) Camera The following table lists the camera specifications of your Latitude 7455. Table 17. Camera specifications  Description Values Number of cameras Camera type ●...

  • Page 23: Touchpad

    For more information about touchpad gestures available on Windows, see the Microsoft Knowledge Base article at Microsoft Support Site. Power adapter The following table lists the power adapter specifications of your Latitude 7455. Table 19. Power adapter specifications  Description Values Type...

  • Page 24: Battery

    Operating and storage temperature ranges may differ among components, so operating or storing the device outside these ranges may impact the performance of specific components. Battery The following table lists the battery specifications of your Latitude 7455. Table 20. Battery specifications  Description...

  • Page 25: Fingerprint Reader

    Fingerprint reader The following table lists the fingerprint-reader specifications of your Latitude 7455. NOTE: The fingerprint reader is on the power button. Table 21. Fingerprint reader specifications  Description Values Fingerprint-reader sensor technology Capacitive Fingerprint-reader sensor resolution 500 dpi Fingerprint-reader sensor pixel size...

  • Page 26: Gpu-Integrated

    Values Power consumption (maximum) 3.75 W Anti-glare vs glossy finish Anti-glare GPU—Integrated The following table lists the specifications of the integrated Graphics Processing Unit (GPU) supported by your Latitude 7455. Table 23. GPU—Integrated  Controller Memory size Processor Qualcomm Adreno Graphics Shared system memory ●...

  • Page 27: Operating And Storage Environment

    Fingerprint reader in the power button (for computers shipped with fingerprint reader) Operating and storage environment This table lists the operating and storage specifications of your Latitude 7455. Airborne contaminant level: G1 as defined by ISA-S71.04-1985 Table 27. Computer environment ...

  • Page 28: Using The Privacy Shutter

    ● Options of thermal mode settings that enhance the performance of your computer. ● Get information about the battery that is connected to your computer. For more information about configuring and using these features, search for the Dell Optimizer User 's Guide at the Dell Support site.

  • Page 29: Chapter 4: Working Inside Your Computer

    You should only perform troubleshooting and repairs as authorized or directed by the Dell technical support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that is shipped with the product or at Dell Regulatory Compliance Home Page.

  • Page 30: Safety Precautions

    ESD protection is an increasing concern. 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 31: Esd Field Service Kit

    It is recommended to always use the traditional wired ESD grounding wrist strap and protective anti-static mat when servicing Dell products. In addition, it is critical to keep sensitive parts separate from all insulator parts while performing service and use anti-static bags for transporting sensitive components.

  • Page 32: Transporting Sensitive Components

    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. After working inside your computer About this task CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer.

  • Page 33: Major Components Of Latitude 7455 (Computers Shipped With Wlan-Only Support)

    WWAN support) WWAN-thermal shield (for M2x2.5 computers with WWAN support) Major components of Latitude 7455 (computers shipped with WLAN-only support) The following image shows the major components of the Latitude 7455 that are shipped with WLAN-only support. Working inside your computer...
  • Page 34 Figure 9. Major components of Latitude 7455 (computers shipped with WLAN-only support) 1. Base cover 2. Heat sink 3. USB Type-C bracket NOTE: The USB Type-C bracket is bundled with the system board. DO NOT remove the USB Type-C bracket from the system board.

  • Page 35: Major Components Of Latitude 7455 (Computers Shipped With Wwan Support)

    Contact your Dell sales representative for purchase options. Major components of Latitude 7455 (computers shipped with WWAN support) The following image shows the major components of the Latitude 7455 that are shipped with WWAN support. Working inside your computer...
  • Page 36 Figure 10. Major components of Latitude 7455 (computers shipped with WWAN support) 1. Base cover 2. USB Type-C bracket NOTE: The USB Type-C bracket is bundled with the system board. DO NOT remove the USB Type-C bracket from the system board.
  • Page 37 24. SIM-card tray NOTE: Dell provides a list of components and their part numbers for the original computer configuration purchased. These parts are available according to warranty coverage purchased by the customer. Contact your Dell sales representative for purchase options.

  • Page 38: Chapter 5: Removing And Installing Customer Replaceable Units (Crus)

    Removing and installing Customer Replaceable Units (CRUs) The replaceable components in this chapter are Customer Replaceable Units (CRUs). CAUTION: Customers can replace only the Customer Replaceable Units (CRUs) following the safety precautions and replacement procedures. NOTE: The images in this document may differ from your computer depending on the configuration you ordered. SIM card Removing the SIM card (for computers shipped with WWAN support)

  • Page 39: Installing The Sim Card (For Computers Shipped With Wwan Support)

    Figure 11. Removing the SIM card Steps 1. Insert a pin into the release hole to release the SIM-card tray. 2. Push the pin to disengage the lock, and eject the SIM-card tray. 3. Slide the SIM-card tray out of the slot on the computer. 4.

  • Page 40: Sim-Card Tray

    Figure 12. Installing the SIM card Steps 1. Insert a pin into the release hole to release the SIM-card tray. 2. Push the pin to disengage the lock, and eject the SIM-card tray. 3. Slide the SIM-card tray out of the slot on the computer. 4.

  • Page 41: Installing The Sim-Card Tray (For Computers Shipped With Wwan Support)

    Prerequisites Follow the procedure in Before working inside your computer. CAUTION: Removing the SIM card when the computer is turned on can cause data loss or damage to the card. Ensure that your computer is turned off or the network connections are disabled. About this task The following images indicate the location of the SIM-card tray and provide a visual representation of the removal procedure.

  • Page 42: Base Cover

    Figure 14. Installing the SIM-card tray Steps 1. Align and place the SIM card in the dedicated slot on the SIM-card tray, with the metallic contact of the SIM card facing up. 2. Align the SIM card tray with the slot on the computer and carefully slide it into the slot, until it clicks into place. Next steps Follow the procedure in After working inside your...
  • Page 43 Figure 15. Removing the base cover Removing and installing Customer Replaceable Units (CRUs)
  • Page 44 Figure 16. Removing the base cover Figure 17. Disconnecting the battery cable Removing and installing Customer Replaceable Units (CRUs)

  • Page 45: Installing The Base Cover

    Steps 1. Remove the five screws (M2x5.5) that secure the base cover to the palm-rest and keyboard assembly. NOTE: Ensure that you remove the five non-captive screws first to create the gap for prying the base cover off the palm-rest and keyboard assembly. 2.
  • Page 46 Figure 19. Installing the base cover Removing and installing Customer Replaceable Units (CRUs)

  • Page 47: Solid State Drive (Ssd)

    Figure 20. Tightening and replacing the screws NOTE: If the battery is not a pre-requisite and if you have disconnected the battery cable, ensure that you connect the battery cable. To connect the battery cable, follow step 1 and step 2 in the procedure. Steps 1.
  • Page 48 About this task The following images indicate the location of the SSD and provide a visual representation of the removal procedure. Figure 21. Removing the SSD Steps 1. Remove the screw (M2x2.5) that secures the SSD thermal shield to the palm-rest and keyboard assembly. 2.

  • Page 49: Installing The Ssd

    Installing the SSD 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 SSD and provide a visual representation of the installation procedure. Figure 23.
  • Page 50 Figure 24. Thermal pad under the SSD thermal shield Figure 25. Installing the SSD thermal shield 4. Align the screw hole on the SSD thermal shield with the screw hole on the system board. 5. Replace the screw (M2x2.5) that secures the SSD thermal shield to the palm-rest and keyboard assembly. Next steps 1.

  • Page 51: Wireless Wide Area Network (Wwan) Card

    Wireless Wide Area Network (WWAN) card Removing the 5G WWAN card NOTE: The information in this removal section is only applicable for computers that are shipped with WWAN support. NOTE: The WWAN card is only available on computers that are manufactured with the WWAN (Cellular Internet) capability. WWAN capability cannot be added to the computer after purchase.

  • Page 52: Installing The 5G Wwan Card

    Steps 1. Pry the WWAN thermal shield from the top-left corner of the thermal shield. NOTE: The triangle on the top-left corner of the WWAN thermal-shield indicates the prying location. 2. Lift the WWAN thermal shield off the 5G WWAN card. NOTE: The WWAN thermal shield includes two thermal pads that are attached to the bottom of the shield.
  • Page 53 Figure 28. Installing the 5G WWAN card Steps 1. Connect the WWAN antenna cables to the 5G WWAN card. Removing and installing Customer Replaceable Units (CRUs)
  • Page 54 Figure 29. Antenna cable connections The following table provides the antenna-cable color scheme for the 5G WWAN card that is supported on your computer. Table 29. Antenna-cable color scheme for 5G WWAN card  Connectors on the WWAN card Antenna-cable color ANT3 Black with a thin gray stripe ANT2...

  • Page 55: Speakers

    Figure 30. Thermal pads at the bottom of the WWAN thermal shield 7. Press the edges of the WWAN card shield to ensure that the shield is secured in place. Next steps 1. Install the base cover. 2. Install the card.
  • Page 56 Figure 31. Removing the speakers Steps 1. Disconnect the right speaker cable from the connector (JSPK2) on the system board. NOTE: DO NOT pull the cable downwards to disconnect the speaker cable from the system board. Instead, use a plastic scribe to pry up the bottom of the head of the cable connector first, and then lift it away from the connector.

  • Page 57: Installing The Speakers

    Figure 32. Disconnecting the speaker cable 2. Remove the speaker cable from the routing guides on the palm-rest and keyboard assembly. 3. Disconnect the left speaker cable from the connector (JSPK1) on the system board. 4. Lift the speakers along with the cables off the palm-rest and keyboard assembly Installing the speakers Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 58 Figure 33. Installing the speakers Steps 1. Using the alignment posts, place the right and left speakers into their slots on the palm-rest and keyboard assembly. NOTE: Ensure that the rubber grommets are seated into the slot and installed on the speakers properly. Figure 34.

  • Page 59: Fan

    Removing the fan (for computers shipped with WLAN-only support) NOTE: The information in this removal section is only applicable for computers that are shipped with WLAN-only support. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the card.

  • Page 60: Removing The Fan (For Computers Shipped With Wwan Support)

    About this task The following images indicate the location of the fan and provide a visual representation of the installation procedure. Figure 36. Installing the fan (for computers shipped with WLAN-only support) Steps 1. Place and align the fan, along with the fan cable, in the slot on the palm-rest and keyboard assembly. CAUTION: Avoid touching the fan blades to prevent damage.

  • Page 61: Installing The Fan (For Computers Shipped With Wwan Support)

    Figure 37. Removing the fan (for computers shipped with WWAN support) Steps 1. Disconnect the fan cable from the connector (JFAN1) on the system board. 2. Remove the two screws (M2x2.5) that secure the fan to the palm-rest and keyboard assembly. 3.
  • Page 62 Figure 38. Installing the fan (for computers shipped with WWAN support) Steps 1. Align the screw holes on the fan with the screw holes on the palm-rest and keyboard assembly. 2. Replace the two screws (M2x2.5) that secure the fan to the palm-rest and keyboard assembly. 3.

  • Page 63: Chapter 6: Removing And Installing Field Replaceable Units (Frus)

    ● 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 rechargeable Li-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See Contact Support at Dell Support Site.

  • Page 64: Installing The Battery

    Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the card. 3. Remove the base cover. About this task CAUTION: Removing the battery resets the BIOS setup settings to default. It is recommended that you note the BIOS setup settings before removing the battery.

  • Page 65: Battery Cable

    Figure 40. Installing the battery Steps 1. Align the screw holes on the battery with the screw holes on the palm-rest and keyboard assembly. 2. Tighten the five captive screws that secure the battery to the palm-rest and keyboard assembly. 3.
  • Page 66 About this task The following images indicate the location of the battery cable and provide a visual representation of the removal procedure. Figure 41. Removing the battery cable Steps 1. Remove the Mylar that adheres the connector to the battery. 2.

  • Page 67: Installing The Battery Cable

    Figure 42. Disconnecting the battery cable Installing the battery cable CAUTION: The information in this installation section is intended for authorized service technicians only. 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 battery cable and provide a visual representation of the installation procedure.

  • Page 68: Heat Sink

    Figure 43. Installing the battery cable Steps 1. Route the battery cable through the routing guides on the back of the battery. 2. Adhere the Mylar to secure battery cable to the routing guides. 3. Connect the battery cable to the connector on the battery. 4.

  • Page 69: Installing The Heat Sink

    NOTE: For maximum cooling of the processor, do not touch the heat-transfer areas on the heat sink. The oils in your skin can reduce the heat-transfer capability of the thermal grease. The following image indicates the location of the heat sink and provide a visual representation of the removal procedure. Figure 44.

  • Page 70: Coin-Cell Battery

    Figure 45. Installing the heat sink Steps 1. Align the screw holes on the heat sink with the screw holes on the system board. 2. In sequential order (1 > 2 > 3 > 4), replace the four screws (M2x2.5) that secure the heat sink to the system board. Next steps 1.

  • Page 71: Installing The Coin-Cell Battery

    Figure 46. Removing the coin-cell battery Steps 1. Using the pull tab, disconnect the I/O-board cable from the connector (JIO1) on the system board. Remove the I/O-board cable from the routing guides on the system board. 2. Disconnect the coin-cell battery cable from the connector (JRTC1) on the system board. 3.

  • Page 72: I/O-Board Cable

    Figure 47. Installing the coin-cell battery Steps 1. Adhere the coin-cell battery on to the coin-cell battery slot on the system board. 2. Route the coin-cell battery cable through the routing guides on the system board. 3. Connect the coin-cell battery cable to the connector (JRTC1) on the system board. 4.
  • Page 73 NOTE: The I/O-board cable is routed along the bottom-right of the fan and secured in place by two pieces of tape. Figure 48. Location of the I/O-board cable The following images indicate the location of the I/O-board cable and provide a visual representation of the removal procedure. Figure 49.

  • Page 74: Installing The I/O-Board Cable (For Computers Shipped With Wlan-Only Support)

    Steps 1. Peel the tape that secures the I/O-board cable to the connector (JIO1) on the I/O board. 2. Open the latch and disconnect the I/O-board cable from the connector (JIO1) on the I/O board. 3. Remove the I/O-board cable from the routing guides on the palm-rest and keyboard assembly. 4.

  • Page 75: Removing The I/O Board Cable (For Computers Shipped With Wwan Support)

    Figure 51. Installing the I/O-board cable (for computers shipped with WLAN-only support) Steps 1. Connect the I/O-board cable to the connector (JIO1) on the I/O board and close the latch to secure the cable in place. 2. Route the I/O-board cable through the routing guides on the palm-rest and keyboard assembly. 3.
  • Page 76 Figure 52. Location of the I/O-board cable The following images indicate the location of the I/O board cable and provide a visual representation of the removal procedure. Figure 53. Removing the I/O board cable (for computers shipped with WWAN support) Steps 1.

  • Page 77: Installing The I/O-Board Cable (For Computers Shipped With Wwan Support)

    2. Remove the cable from the routing guides on the palm-rest and keyboard assembly. 3. Using the pull tab, disconnect the other end of the cable from the connector (JIO1) on the system board. 4. Lift the I/O-board cable off the computer. Installing the I/O-board cable (for computers shipped with WWAN support) CAUTION:...

  • Page 78: I/O-Board Fpc Cable

    Figure 55. Installing the I/O-board cable (for computers shipped with WWAN support) Steps 1. Connect the I/O-board cable to the connector (JIO1) on the I/O board and close the latch to secure the cable in place. 2. Route the I/O-board cable through the routing guides on the palm-rest and keyboard assembly. 3.
  • Page 79 About this task The following images indicate the location of the I/O-board FPC cable and provide a visual representation of the removal procedure. Figure 56. Removing the I/O-board FPC cable Steps 1. Using the pull tab, disconnect the I/O-board cable from the connector (JIO1) on the system board. 2.

  • Page 80: Installing The I/O-Board Fpc Cable (For Computers Shipped With Wwan Support)

    Installing the I/O-board FPC cable (for computers shipped with WWAN support) CAUTION: The information in this installation section is intended for authorized service technicians only. NOTE: The information in this installation section is only applicable for computers that are shipped with WWAN support. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 81: Wlan-Antenna Module

    2. Connect the I/O-board FPC cable (MB) to the connector (JWWAN1) on the system board and close the latch to secure the cable in place. 3. Connect the other end of the I/O-board FPC cable to the connector (JWWAN1) on the I/O board and close the latch to secure the cable in place.
  • Page 82 Figure 58. Removing the WLAN-antenna module (for computers shipped with WLAN-only support) Steps 1. Remove the screw (M2x2.5) that secures the WLAN-thermal shield to the WLAN module. 2. Slide the WLAN-thermal shield to the left and lift the shield off the palm-rest and keyboard assembly. NOTE: The WLAN-thermal shield includes a thermal pad that is attached to the bottom of the shield.

  • Page 83: Installing The Wlan-Antenna Module (For Computers Shipped With Wlan-Only Support)

    Figure 59. Thermal pad below the WLAN-thermal shield 3. Disconnect the WLAN-antenna cables from the connectors (B and W) on the WLAN module. 4. Disconnect the I/O cable (MB) from the connector (JIO1) on the system board. 5. Peel the coin-cell battery and move it along with its cable from the routing guide on the palm-rest and keyboard assembly. 6.
  • Page 84 About this task The following images indicate the location of the WLAN-antenna module and provide a visual representation of the installation procedure. Figure 61. Installing the WLAN-antenna module (for computers shipped with WLAN-only support) Steps 1. Route the WLAN-antenna cables along the routing guides on the palm-rest and keyboard assembly. NOTE: Ensure that you route the antenna cables along its routing guides under the heat sink.
  • Page 85 Figure 62. Installing WLAN-antenna cables 2. Place the WLAN-antenna module in the slot on the palm-rest and keyboard assembly. 3. Align the screw hole on the WLAN-antenna module with the screw hole on the palm-rest and keyboard assembly. 4. Replace the screw (M2x2.5) that secures the WLAN-antenna module to the palm-rest and keyboard assembly. 5.

  • Page 86: Removing The Wlan-Antenna Module (For Computers Shipped With Wwan Support)

    Figure 63. Thermal pad below the WLAN-thermal shield Figure 64. Installing the WLAN-thermal shield 11. Replace the screw (M2x2.5) that secures the WLAN-thermal shield to the WLAN module. Next steps 1. Install the fan. 2. Install the base cover. 3. Install the card.
  • Page 87 Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the card. 3. Remove the base cover. 4. Remove the fan. About this task The following images indicate the location of the WLAN-antenna module and provide a visual representation of the removal procedure.
  • Page 88 Figure 66. Removing the WLAN-antenna module Steps 1. Remove the screw (M2x2.5) that secures the WLAN-thermal shield to the WLAN module. 2. Slide the WLAN-thermal shield to the left and lift the shield off the palm-rest and keyboard assembly. NOTE: The WLAN-thermal shield includes a thermal pad that is attached to the bottom of the shield.

  • Page 89: Installing The Wlan-Antenna Module (For Computers Shipped With Wwan Support)

    Figure 68. Removing WLAN-antenna cables 10. Lift the WLAN-antenna module off the palm-rest and keyboard assembly, ensuring that you thread the WLAN-antenna cables through the routing guide beneath the heat sink. Installing the WLAN-antenna module (for computers shipped with WWAN support) CAUTION: The information in this installation section is intended for authorized service technicians only.
  • Page 90 Figure 69. Installing the WLAN-antenna module (for computers shipped with WWAN support) Removing and installing Field Replaceable Units (FRUs)
  • Page 91 Figure 70. Installing the WLAN-antenna module (for computers shipped with WWAN support) Steps 1. Place the WLAN-antenna module in the slot on the palm-rest and keyboard assembly. 2. Align the screw hole on the WLAN-antenna module with the screw hole on the palm-rest and keyboard assembly. 3.
  • Page 92 Figure 71. Installing WLAN-antenna cables 5. Adhere the tape that secures the WLAN-antenna cables to the palm-rest and keyboard assembly. 6. Connect the WLAN-antenna cables to the connectors (B and W) on the WLAN module. The following table provides the WLAN-antenna cables color scheme for the WLAN module that is supported for your computer.
  • Page 93 Figure 72. Thermal pad below the WLAN-thermal shield Figure 73. Installing the WLAN-thermal shield 11. Replace the screw (M2x2.5) that secures the WLAN-thermal shield to the WLAN module. Next steps 1. Install the fan. 2. Install the base cover. 3. Install the card.

  • Page 94: Display Assembly

    Display assembly Removing the display assembly (for computers shipped with WLAN-only support) CAUTION: The information in this removal section is intended for authorized service technicians only. CAUTION: The maximum operating angle for the display-panel hinge is 135 degrees. Prerequisites 1. Follow the procedure in Before working inside your computer.
  • Page 95 Figure 74. Removing the display assembly (for computers shipped with WLAN-only support) Steps 1. Peel the Mylar and open the latch from the camera connector (MIPI) on the system board. 2. Disconnect the camera cable from the camera connector (MIPI) on the system board. 3.

  • Page 96: Installing The Display Assembly (For Computers Shipped With Wlan-Only Support)

    Figure 75. Display assembly Installing the display assembly (for computers shipped with WLAN- only support) CAUTION: The information in this installation section is intended for authorized service technicians only. CAUTION: The maximum angle for the display hinge is 135 degrees. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 97 Figure 76. Installing the display assembly (for computers shipped with WLAN-only support) Steps 1. Place the palm-rest and keyboard assembly at the edge of a flat table. 2. Open the hinges of the display assembly to a 90-degree angle. 3. Align the screw holes on the display hinges with the screw holes on the palm-rest and keyboard assembly. 4.

  • Page 98: Removing The Display Assembly (For Computers Shipped With Wwan Support)

    Removing the display assembly (for computers shipped with WWAN support) CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the card. 3. Remove the base cover.
  • Page 99 Figure 78. Removing the display assembly (for computers shipped with WWAN support) Steps 1. Disconnect the Darwin cable from the connector (JANT1) on the I/O board. 2. Remove the Darwin cables and WWAN-antenna cables from the rubber routing guides on the I/O board and keyboard bracket.

  • Page 100: Installing The Display Assembly (For Computers Shipped With Wwan Support)

    Figure 79. Display assembly Installing the display assembly (for computers shipped with WWAN support) CAUTION: The information in this installation section is intended for authorized service technicians only. CAUTION: The maximum angle for the display hinge is 135 degrees. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 101 Figure 80. Installing the display assembly (for computers shipped with WWAN support) Removing and installing Field Replaceable Units (FRUs)
  • Page 102 Figure 81. Installing the display assembly (for computers shipped with WWAN support) Steps 1. Place the palm-rest and keyboard assembly at the edge of a flat table. 2. Open the hinges of the display assembly to a 90-degree angle. 3. Align the screw holes of the palm-rest and keyboard assembly with the screw holes on the hinges of the display assembly. 4.

  • Page 103: I/O Board

    I/O board Removing the I/O board (for computers shipped with WLAN-only support) CAUTION: The information in this removal section is intended for authorized service technicians only. NOTE: The information in this removal section is only applicable for computers that are shipped with WLAN-only support. Prerequisites 1.

  • Page 104: Installing The I/O-Board (For Computers Shipped With Wlan-Only Support)

    Installing the I/O-board (for computers shipped with WLAN-only support) CAUTION: The information in this installation section is intended for authorized service technicians only. NOTE: The information in this installation section is only applicable for computers that are shipped with WLAN-only support.

  • Page 105: Removing The I/O Board (For Computers Shipped With Wwan Support)

    Removing the I/O board (for computers shipped with WWAN support) CAUTION: The information in this removal section is intended for authorized service technicians only. NOTE: The information in this removal section is only applicable for computers that are shipped with WWAN support. Prerequisites 1.

  • Page 106: Installing The I/O Board (For Computers Shipped With Wwan Support)

    NOTE: Ensure that the power button is not displaced while removing the I/O board. Installing the I/O board (for computers shipped with WWAN support) CAUTION: The information in this installation section is intended for authorized service technicians only. NOTE: The information in this installation section is only applicable for computers that are shipped with WWAN support. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 107: Touchpad Assembly

    2. Install the WWAN card. 3. Install the base cover. 4. Install the SIM-card tray. 5. Install the card. 6. Follow the procedure in After working inside your computer. Touchpad assembly Removing the touchpad assembly CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1.

  • Page 108: Installing The Touchpad Assembly

    Installing the touchpad assembly CAUTION: The information in this installation section is intended for authorized service technicians only. 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 touchpad assembly and provide a visual representation of the installation procedure.

  • Page 109: Power Button

    Power button Removing the power button CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the card. 3. Remove the SIM-card tray. 4.

  • Page 110: Installing The Power Button

    Figure 89. Removing the power button with fingerprint reader Lift the power button off the palm-rest and keyboard assembly. Installing the power button CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the power button and provides a visual representation of the installation procedure.
  • Page 111 Figure 90. Installing the power button Figure 91. Installing the power button with fingerprint reader Using the alignment post, place the power button in the slot on the palm-rest and keyboard assembly. NOTE: Ensure that the tab is inserted inside the slot and not on top of it. Avoid creating a gap, which may damage the I/O board or the base cover.

  • Page 112: System Board

    Figure 92. Installing the power button Next steps 1. Install the I/O board with WLAN-only support I/O board with WWAN support, whichever is applicable. 2. Install the display assembly with WLAN-only support display assembly with WWAN support, whichever is applicable. 3.
  • Page 113 Figure 93. System-board connectors 1. Fan cable connector (JFAN1) 2. Camera-cable connector (MIPI) 3. Display-cable connector (EDP) 4. Solid state drive slot (SSD) 5. Left speaker-cable connector (JSPK1) 6. Battery-cable connector (JBATT1) 7. Keyboard-backlight cable connector (JKBBL1) 8. Keyboard-cable connector (JKB1) 9.
  • Page 114 Figure 94. Removing the system board Figure 95. Removing the system board Removing and installing Field Replaceable Units (FRUs)

  • Page 115: Installing The System Board

    Steps 1. Remove the screw (M2x2.5) that secures the WLAN thermal shield to the palm-rest and keyboard assembly. 2. Slide the WLAN thermal shield to the left and lift the shield off the palm-rest and keyboard assembly. 3. Disconnect the WLAN antenna cables from the connectors (B and W) on the WLAN module. 4.
  • Page 116 Figure 96. System-board connectors 1. Fan cable connector (JFAN1) 2. Camera-cable connector (MIPI) 3. Display-cable connector (EDP) 4. Solid state drive slot (SSD) 5. Left speaker-cable connector (JSPK1) 6. Battery-cable connector (JBATT1) 7. Keyboard-backlight cable connector (JKBBL1) 8. Keyboard-cable connector (JKB1) 9.
  • Page 117 Figure 97. Installing the system board Figure 98. Installing the system board Removing and installing Field Replaceable Units (FRUs)

  • Page 118: Palm-Rest And Keyboard Assembly

    Steps 1. Align the screw holes of the system board with the screw holes on the palm-rest and keyboard assembly. 2. Replace the two screws (M2x2.5) that secure the USB Type-C bracket to the palm-rest and keyboard assembly. 3. Adhere the coin-cell battery to the WWAN I/O board FPC cable (for computers that are shipped with WWAN support). 4.

  • Page 119: Installing The Palm-Rest And Keyboard Assembly

    9. Remove the battery. 10. Remove the heat sink. 11. Remove the I/O-board cable with WLAN-only support I/O-board cable with WWAN support, whichever is applicable. 12. Remove the I/O board FPC cable (for computers that are shipped with WWAN support). 13.
  • Page 120 Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image shows the palm-rest and keyboard assembly before all the components in the post-requisites steps have been installed. Place the palm-rest and keyboard assembly on a flat surface. Figure 100.

  • Page 121: Chapter 7: Software

    Your Latitude 7455 supports the following operating systems: ● Windows 11 Home, ARM ● Windows 11 Pro, ARM Drivers and downloads When troubleshooting, downloading, or installing drivers, it is recommended that you read the Dell Knowledge Base article Drivers and Downloads FAQs 000123347. Software...

  • Page 122: Chapter 8: Bios Setup

    BIOS Setup CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup. Certain changes can make your computer work incorrectly. NOTE: Depending on the computer and the installed devices, the options that are listed in this section may or may not be displayed.

  • Page 123: View Advanced Setup Options

    Depending on your computer and its installed devices, the items that are listed in this system setup section may or may not be displayed. Table 35. System setup options—Overview menu  Overview Latitude 7455 BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer.
  • Page 124 The computer stops booting to the operating system when a component is not authenticated during the boot process. Secure Boot can be enabled in BIOS setup or using management interfaces like Dell Command|Configure, but can only be disabled from BIOS setup.
  • Page 125 Table 36. System setup options—Boot Configuration menu (continued) Boot Configuration For additional security, Dell Technologies recommends keeping the Secure Boot option enabled to ensure that the UEFI firmware validates the operating system during the boot process. Enable Microsoft UEFI CA When disabled, the UEFI CA is removed from the BIOS UEFI Secure Boot database.
  • Page 126 Table 37. System setup options—Integrated Devices menu (continued) Integrated Devices Enable Thunderbolt Technology Support Enable Thunderbolt Technology Support Enables the associated ports and adapters for Thunderbolt Technology support. By default, the Enable Thunderbolt Technology Support option is enabled. Enable Thunderbolt Boot Support Enable Thunderbolt Boot Support Enables the Thunderbolt adapter-peripheral device and USB devices that are connected to the Thunderbolt adapter to be used during BIOS Preboot.
  • Page 127 Table 39. System setup options—Storage menu  Storage Storage Interface Displays the information of various onboard drives. Port Enablement Enables or disables the M.2 PCIe SSD option. By default, the M.2 PCIe SSD option is enabled. Drive Information Displays the information of onboard drives. Table 40.
  • Page 128 BIOS. This option returns to the disabled state when the computer restarts. By default, the Clear option is disabled. Dell Technologies recommends enabling the Clear option only when TPM data is required to be cleared. Physical Presence Interface (PPI) Bypass...
  • Page 129 Table 42. System setup options—Security menu (continued) Security For additional security, Dell Technologies recommends keeping the Chassis Intrusion Detection option enabled. Clear Intrusion Warning The Clear Intrusion Warning option appears only after chassis intrusion is enabled and is tripped. By default, the Clear Intrusion Warning option is disabled.
  • Page 130 BIOS passwords. You can modify the minimum and maximum length of the passwords and require passwords to contain certain character classes (upper case, lower case, digit, special character). Dell Technologies recommends setting the minimum password length to at least eight characters. NOTE:...
  • Page 131 This gives an administrator control over the BIOS settings but enables an end user to provide their own password. By default, the Allow Non-Admin Password Changes option is disabled. For additional security, Dell Technologies recommends keeping the Allow Non- Admin Password Changes option disabled. NOTE:...
  • Page 132 Table 45. System setup options—System Management menu  System Management Service Tag Displays the Service Tag of the computer. Asset Tag Creates a computer Asset Tag that can be used by an IT administrator to uniquely identify a particular computer. NOTE: Once set in BIOS, the Asset Tag cannot be changed.

  • Page 133: Updating The Bios

    If the recovery key is not known this can result in data loss or an unnecessary operating system reinstall. For more information about this subject, search in the Knowledge Base Resource at Dell Support Site. Steps 1.

  • Page 134: Updating The Bios From The F12 One-Time Boot Menu

    One-Time boot menu on the computer. Most of the Dell computers built after 2012 have this capability, and you can confirm by booting your computer to the F12 One-Time Boot Menu to see if BIOS FLASH UPDATE is listed as a boot option for your computer. If the option is listed, then the BIOS supports this BIOS update option.

  • Page 135: Assigning A System Setup Password

    Table 49. System and setup password (continued) Password type Description Setup password Password that you must enter to access and make changes to the BIOS settings of your computer. You can create a system password and a setup password to secure your computer. CAUTION: The password features provide a basic level of security for the data on your computer.

  • Page 136: Clearing Cmos Settings

    6. Connect the battery cable to the system board. 7. Replace the base cover. Clearing BIOS (System Setup) and System passwords About this task To clear the computer or BIOS passwords, contact Dell technical support as described at Contact Support. For more information, go to Dell Support Site.
  • Page 137 Figure 101. Enable block boot until cleared If Block Boot Until Cleared is set to ON, select BIOS-Setup to clear the alert so the computer boots up normally. Figure 102. Clear chassis intrusion alert If Block Boot Until Cleared is set to OFF, select Continue or BIOS-Setup to clear the alert so the computer boots up normally.
  • Page 138 Figure 103. Clear chassis intrusion alert NOTE: If Continue is selected, the user continues to see the alert each time the computer is turned on until the alert is cleared. To clear the alert, select ON in the Clear Intrusion Warning field in the Security submenu of the BIOS setup menu. Figure 104.

  • Page 139: Chapter 9: Troubleshooting

    ● Using a non-Dell or incompatible battery may increase the risk of fire or explosion. Replace the battery only with a compatible battery purchased from Dell that is designed to work with your Dell computer. Do not use a battery from other computers with your computer.

  • Page 140: Dell Supportassist Pre-Boot System Performance Check Diagnostics

    LCD Built-in Self-Test (BIST) Dell laptops have a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent problem with the LCD (screen) of the Dell laptop or with the video card (GPU) and computer settings.

  • Page 141: Lcd Power Rail Test (L-Bist)

    Real-Time Clock (RTC Reset) The Real-Time Clock (RTC) reset function enables you or the service technician to recover Dell computers from No POST, No Power, or No Boot situations. The legacy jumper enabled RTC reset is retired on these models.

  • Page 142: Wi-Fi Power Cycle

    6. Install the battery. 7. Install the base cover. 8. Connect the power adapter to the computer. 9. Turn on the computer. NOTE: For more information about performing a hard reset, search in the Knowledge Base Resource at Dell Support Site. Troubleshooting...

  • Page 143: Chapter 10: Getting Help And Contacting Dell

    Getting help and contacting Dell Self-help resources You can get information and help on Dell products and services using these self-help resources: Table 51. Self-help resources  Self-help resources Resource location Information about Dell products and services Dell Site Tips Contact Support In Windows search, type Contact Support, and press Enter.

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