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Dell Latitude 5401 Service Manual
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Dell Latitude 5401 Service Manual

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Dell Latitude 5401
Service Manual
Regulatory Model: P98G
Regulatory Type: P98G003

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Summary of Contents for Dell Latitude 5401

  • Page 1 Dell Latitude 5401 Service Manual Regulatory Model: P98G Regulatory Type: P98G003...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2018 - 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 DDR4......................................10 USB features..................................
  • Page 4 Removing the heatsink assembly-discrete.........................36 Installing the heatsink assembly-discrete........................38 Heatsink assembly—UMA..............................41 Removing the heatsink assembly-UMA........................41 Installing the heatsink assembly-UMA........................42 DC-in port.....................................45 Removing the DC-in..............................45 Installing the DC-in................................ 46 SmartCard reader................................47 Removing the smartcard reader board........................47 Installing the smartcard reader board......................... 48 Touchpad buttons................................
  • Page 5 Replacing the display back cover..........................88 Palmrest assembly................................89 Replacing the palmrest assembly..........................89 4 Troubleshooting......................... 92 Enhanced Pre-Boot System Assessment (ePSA) diagnostics..................92 Running the ePSA diagnostics.............................92 System diagnostic lights..............................92 WiFi power cycle................................. 93 5 Getting help..........................94 Contacting Dell..................................94 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 About this task After you complete any replacement procedure, ensure that you connect any external devices, cards, and cables before turning on your...

  • Page 10: Technology And Components

    Technology and components NOTE: Instructions provided in this section are applicable on computers shipped with Windows 10 operating system. Windows 10 is factory-installed with this computer. Topics: • DDR4 • USB features • USB Type-C • HDMI 1.4 • USB features •...

  • Page 11: Usb Features

    Curved edge DDR4 modules feature a curved edge to help with insertion and alleviate stress on the PCB during memory installation. Figure 3. Curved edge Memory Errors Memory errors on the system display the new ON-FLASH-FLASH or ON-FLASH-ON failure code. If all memory fails, the LCD does not turn on.
  • Page 12 USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below: • An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below). • USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more for two pairs of differential signals (receive and transmit) for a combined total of eight connections in the connectors and cabling.

  • Page 13: Usb Type-C

    Windows 7, SuperSpeed support would trickle down to Vista. Microsoft has confirmed this by stating that most of their partners share the opinion that Vista should also support USB 3.0/USB 3.1 Gen 1. USB Type-C USB Type-C is a new, tiny physical connector. The connector itself can support various exciting new USB standards like USB 3.1 and USB power delivery (USB PD).

  • Page 14: Hdmi 1.4

    Thunderbolt 3 over USB Type-C Thunderbolt 3 brings Thunderbolt to USB Type-C at speeds up to 40 Gbps, creating one compact port that does it all - delivering the fastest, most versatile connection to any dock, display or data device like an external hard drive. Thunderbolt 3 uses a USB Type-C connector/port to connect to supported peripherals.

  • Page 15: Usb Features

    • Low -cost HDMI provides the quality and functionality of a digital interface while also supporting uncompressed video formats in a simple, cost-effective manner • Audio HDMI supports multiple audio formats from standard stereo to multichannel surround sound • HDMI combines video and multichannel audio into a single cable, eliminating the cost, complexity, and confusion of multiple cables currently used in A/V systems •...

  • Page 16: Power Button Led Behavior

    Power button LED behavior On certain Dell Latitude systems, the power button LED is used to provide an indication of the system status, and as a result the power button illuminates when pressed. The systems with the optional power button/fingerprint reader will have no LED under the power button and hence will apply the available LED's in the system to provide an indication of the system status.
  • Page 17 • Safeguards do not time out if the device gets hung during the logon process. • Dell logo: Turns on within 2 secs after pressing the power button. • Full boot: Within 22 secs after pressing the power button. •...
  • Page 18 2. Solid amber -the battery charge is critically low. A low battery state is approximately 30 minutes or less of battery life remaining. • Camera LED • White LED activates when camera is on. • Mic Mute LED: • When activated (muted), the mic mute LED on the F4 Key should illuminate WHITE. •...

  • Page 19: Disassembly And Reassembly

    Disassembly and reassembly Base cover Removing the base cover Prerequisites 1. Follow the procedure in Before working inside your computer. About this task The figure indicates the location of the base cover and provides a visual representation of the removal procedure. Disassembly and reassembly...

  • Page 20: Installing The Base Cover

    Steps 1. Remove the five (M2.5x6) and three (M2.5x8) captive screws that secure the base cover to the computer. 2. Pry the base cover starting from the right hinge and work your way around. 3. Lift the base cover away from the computer. Installing the base cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 21 Disassembly and reassembly...

  • Page 22: Battery

    Steps 1. Place the base cover on the palmrest and keyboard assembly, and snap the base cover into place. 2. Install the five (M2.5x6) and three (M2.5x8) captive screws to secure the base cover to the computer. Next steps 1. Follow the procedure in After working inside your computer.

  • Page 23: Removing The 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 https://www.dell.com/support.

  • Page 24: Installing The Battery

    Installing the battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The figure indicates the location of the battery and provides a visual representation of the installation procedure. Steps 1.

  • Page 25: Installing The Wlan Card

    3. Remove the battery. About this task The figure indicates the location of the WLAN card and provides a visual representation of the removal procedure. Steps 1. Remove the single (M2x3) screw that secures the WLAN bracket to the computer. 2.

  • Page 26: Wwan Card

    Steps 1. Locate the WLAN card slot on your computer. 2. Slide the WLAN card into the slot on the system board. 3. Connect the WLAN antenna cables to the WLAN module. 4. Place the WLAN card bracket on the WLAN card and replace the single (M2x3) screw to secure the bracket to the computer. Next steps 1.

  • Page 27: Installing The Wwan Card

    About this task The figure indicates the location of the WWAN card and provides a visual representation of the removal procedure. Steps 1. Remove the single (M2x3) screw that secures the WWAN card bracket to the computer. 2. Remove the WWAN card bracket from the computer. 3.

  • Page 28: Memory Modules

    Steps 1. Locate the WWAN card slot on your computer. 2. Slide the WWAN card into the slot on the system board. 3. Connect the WWAN antenna cables to the WWAN module. 4. Place the WWAN card bracket on the WWAN card and replace the single (M2x3) screw to secure the bracket to the computer. Next steps 1.

  • Page 29: Installing The Memory Module

    About this task The figure indicates the location of the memory module and provides a visual representation of the removal procedure. Steps 1. Using your finger tips gently pry the retention clips away from the memory module until the memory module pops up. 2.

  • Page 30: Solid State Drive

    Steps 1. Align the notch on the memory module with the tab on the memory module slot. 2. Slide the memory module firmly into the slot at an angle. 3. Press the memory module down until it clicks into place. NOTE: If you do not hear the click, remove the memory module and reinstall it.

  • Page 31: Installing The Sata M.2 2280 Ssd

    Steps 1. Locate the SSD on your computer. 2. Remove the thermal tape from the SSD module. 3. Remove the single (M2x3) screw that secure the SSD module to the computer. 4. Slide the SSD module out from the computer. Installing the SATA M.2 2280 SSD Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 32: Coin-Cell Battery

    Steps 1. Locate the SSD slot on your computer. 2. Slide the SSD into the slot. 3. Place the SSD thermal tape over the SSD module. 4. Replace the single (M2x3) screw to secure the SSD module to the computer. Next steps 1.

  • Page 33: Installing The Coin-Cell Battery

    Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The figure indicates the location of the coin-cell and provides a visual representation of the installation procedure. Steps 1.
  • Page 34 About this task The figure indicates the location of the inner frame and provides a visual representation of the removal procedure. Steps 1. Unroute the WWAN and WLAN antenna cables from the routing clips. Disassembly and reassembly...

  • Page 35: Installing The Inner Frame

    2. Peel the coin-cell battery from the inner frame. 3. Remove the six (M2x5) and six (M2x3) screws that secure the inner frame to the computer. 4. Lift the inner frame out of the computer. Installing the inner frame Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 36: Heatsink Assembly-Discrete

    Steps 1. Align and place the inner frame into the slot on your computer. 2. Replace the six (M2x5) and six (M2x3) screws to secure the inner frame to the computer. 3. Route the WWAN and WLAN antenna cables through the retention clips on the frame. 4.
  • Page 37 Disassembly and reassembly...

  • Page 38: Installing The Heatsink Assembly-Discrete

    Steps 1. Locate the heatsink on your computer. 2. Disconnect the fan cable from the connector on the system board. 3. Remove the two (M2x3) screws that secure the fan section of the heatsink assembly to the system board. 4. Remove the six (M2x3) screws that secure the heatsink assembly to the system board. NOTE: Remove the screws in the order of the callout numbers [1, 2, 3, 4, 5, 6] as indicated on the heatsink.
  • Page 39 Disassembly and reassembly...
  • Page 40 Steps 1. Align the screw hole on the heatsink with the screw hole on the heatsink fan. 2. Replace the single (M2x3) screw to secure the heatsink fan to the heatsink. 3. Locate the heatsink assembly slot on your computer. 4.

  • Page 41: Heatsink Assembly-Uma

    Heatsink assembly—UMA Removing the heatsink assembly-UMA Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. About this task The figure indicates the location of the heatsink and provides a visual representation of the removal procedure. Disassembly and reassembly...

  • Page 42: Installing The Heatsink Assembly-Uma

    Steps 1. Locate the heatsink assembly on your computer. 2. Remove the six (M2x3) screws that secure the heatsink assembly to the computer. NOTE: Remove the screws as per the callout on the heatsink module. 3. Disconnect the heatsink fan cable from the system board. 4.
  • Page 43 Disassembly and reassembly...
  • Page 44 Steps 1. Align the screw hole on the heatsink with the screw hole on the heatsink fan. 2. Replace the single (M2x3) screw to secure the heatsink fan to the heatsink. 3. Locate the heatsink assembly slot on your computer. 4.

  • Page 45: Dc-In Port

    DC-in port Removing the DC-in Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the heatsink-discrete. About this task The figure indicates the location of the DC-in and provides a visual representation of the removal procedure. Steps 1.

  • Page 46: Installing The Dc-In

    Installing the DC-in Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The figure indicates the location of the DC-in and provides a visual representation of the installation procedure. Steps 1.

  • Page 47: Smartcard Reader

    SmartCard reader Removing the smartcard reader board Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the 2280 SATA SSD. 5. Remove the WLAN card. 6. Remove the WWAN card.

  • Page 48: Installing The Smartcard Reader Board

    Steps 1. Locate the smartcard reader board on your computer. 2. Open the latch and disconnect the touchpad button board cable from the system board. 3. Open the latch and disconnect the smartcard reader board cable from the system board. 4.

  • Page 49: Touchpad Buttons

    2. Align and place the smartcard reader board into the slot on your computer. 3. Replace the three (M2x3) screws that secure the smartcard reader board to the computer. 4. Adhere the smartcard reader cable to the palmrest and connect the cable to the connector on the system board. 5.

  • Page 50: Installing The Touchpad Button Board

    Steps 1. Locate the touchpad buttons board on your computer. 2. Open the latch and disconnect the touchpad button board cable from the connector on the system board. 3. Remove the two (M2x3) screws that secure the touchpad button board to the palmrest. 4.

  • Page 51: Led Board

    Steps 1. Locate the touchpad button board slot on your computer. 2. Align and place the touchpad button board into the slot on your computer. 3. Replace the two (M2x3) screws to secure the touchpad button board to the plamrest. 4.

  • Page 52: Installing The Led Board

    7. Remove the inner frame. About this task The figure indicates the location of the LED board and provides a visual representation of the removal procedure. Steps 1. Locate the LED board on your computer. 2. Open the latch and disconnect the LED board cable from the connector on the system board. 3.
  • Page 53 Steps 1. Locate the LED board slot on your computer. 2. Align and place the LED board on the slot on your computer. 3. Replace the single (M2x3) screw that secures the LED board to the computer. 4. Adhere the LED board cable to the adhesive strip on the palmrest. 5.

  • Page 54: Speakers

    Speakers Removing the speakers Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the 2280 SATA SSD. 5. Remove the WLAN card. 6. Remove the WWAN card. 7.

  • Page 55: Installing The Speakers

    Steps 1. Locate the speakers on your computer. 2. Unroute the speaker cables from the retention clips on the computer. 3. Lift the speakers out of the computer. Installing the speakers Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The figure indicates the location of the speakers and provides a visual representation of the installation procedure.

  • Page 56: System Board

    Next steps 1. Install the board. 2. Install the inner frame. 3. Install the WLAN card. 4. Install the WWAN card. 5. Install the 2280 SATA SSD. 6. Install the battery. 7. Install the base cover. 8. Follow the procedure in After working inside your computer.
  • Page 57 Disassembly and reassembly...

  • Page 58: Installing The System Board

    Steps 1. Locate the system board on your computer. 2. Remove the single (M2x3) screw that secures the fingerprint reader metal bracket. 3. Remove the fingerprint metal bracket from the computer and flip the fingerprint sensor over. 4. Remove the two (M2x3) screws that secure the display bracket in place. 5.
  • Page 59 Disassembly and reassembly...
  • Page 60 Steps 1. Locate the system board slot on your computer. 2. Slide the ports on the system board into the slots on the palmrest and align the screw holes on the system board with the screw holes on the palmrest. 3.

  • Page 61: Keyboard

    Next steps 1. Install the DC-in. 2. Install the heatsink-discrete or heatsink-UMA. 3. Install the board. 4. Install the inner frame. 5. Install the memory. 6. Install the WLAN card. 7. Install the WWAN card. 8. Install the 2280 SATA SSD.
  • Page 62 Steps 1. Locate the Keyboard on your computer. 2. Open the latch and disconnect the following cables: a) keyboard cable Disassembly and reassembly...

  • Page 63: Installing The Keyboard

    b) keyboard backlit cable c) touchpad cable d) touchpad button board cable 3. Remove the eighteen (M2x2.5) screws that secure the keyboard assembly to the palmrerst. 4. Carefully lift the keyboard assembly from the palmrest. 5. Flip the keyboard assembly. 6.
  • Page 64 Steps 1. Replace the six (M2x2) screws to secure the keyboard to the keyboard bracket. 2. Flip the keyboard assembly and align it to its slot on the palmrest. 3. Press down on the lattice at the snap points, in order to secure the keyboard assembly to the palmrest. NOTE: The keyboard has multiple snap points on the lattice side which must be pushed down firmly after the keyboard is replaced.

  • Page 65: Power Button

    Power button Removing the power button with fingerprint reader Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the 2280 SATA SSD. 5. Remove the memory. 6. Remove the WLAN card.

  • Page 66: Display Assembly

    About this task The figure indicates the location of the power button with fingerprint and provides a visual representation of the installation procedure. Steps 1. Locate the power button with fingerprint slot on your computer. 2. Align and place the power button with fingerprint into the slot on your computer. 3.
  • Page 67 About this task The figure indicates the location of the display assembly and provides a visual representation of the removal procedure. Disassembly and reassembly...
  • Page 68 Disassembly and reassembly...

  • Page 69: Installing The Display Assembly

    Steps 1. Remove the two (M2x3) screws that secure the EDP metal bracket to the computer. 2. Peel the tape that secures the display cable to the system board. 3. Open the latch and disconnect the display cable from the system board. 4.
  • Page 70 Disassembly and reassembly...
  • Page 71 Disassembly and reassembly...
  • Page 72 Disassembly and reassembly...
  • Page 73 Steps 1. Place the display assembly on a clean and flat surface. 2. Align and place the palmrest on the display assembly. 3. Using the alignment posts, close the display hinges. 4. Connect the display cable to the system board and adhere the tape to secure the display cable. 5.

  • Page 74: Display Bezel

    Display bezel Removing the display bezel Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the WLAN card. 5. Remove the WWAN card. 6. Remove the display assembly.

  • Page 75: Installing The Display Bezel

    Installing the display bezel Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The figure indicates the location of the display bezel and provides a visual representation of the installation procedure. Steps Align the display bezel with the display back-cover and antenna assembly, and gently snap the display bezel into place.

  • Page 76: Hinge Caps

    Hinge caps Removing the hinge caps Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the display assembly. 5. Remove the display bezel. About this task The figure indicates the location of the hinge caps and provides a visual representation of the removal procedure. Steps 1.

  • Page 77: Installing The Hinge Caps

    Installing the hinge caps Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The figure indicates the location of the hinge caps and provides a visual representation of the installation procedure. Steps 1.

  • Page 78: Display Panel

    Display panel Removing the display panel Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the display assembly. 5. Remove the display bezel. 6. Remove the display hinge caps.
  • Page 79 Steps 1. Locate the display panel on the display back cover assembly. Disassembly and reassembly...

  • Page 80: Installing The Display Panel

    2. Remove the two (M2.5x3) screws that secure the display panel to the display assembly. 3. Lift to turn over the display panel to access the display cable. 4. Peel the conductive tape on the display cable connector. 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.
  • Page 81 Disassembly and reassembly...
  • Page 82 Steps 1. Connect the display cable to the connector and close the latch. 2. Adhere the adhesive strip to secure the display cable connector. 3. Turn back and place the display panel over the display back cover. 4. Replace the two (M2.5x3) screws that secure the display panel to the display assembly. Next steps 1.

  • Page 83: Camera

    Camera Removing camera Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 4. Remove the display assembly. 5. Remove the display bezel. 6. Remove the display hinge caps. 7. Remove the display panel.

  • Page 84: Display Hinges

    Steps 1. Insert the camera into the slot on the display back cover . 2. Connect the camera cable to the connector and adhere the adhesive tape above the camera connector. 3. Affix the two conductive tape above the camera module. Next steps 1.

  • Page 85: Installing Display Hinge

    Steps 1. Remove the four (M2.5x3) screws that secure the display hinge to the display assembly. 2. Remove the display hinges from the display back cover. Installing display hinge About this task The figure indicates the location of the camera and provides a visual representation of the installation procedure. Disassembly and reassembly...

  • Page 86: Display (Edp) Cable

    Steps 1. Place the display hinge on the display assembly. 2. Replace the four (M2.5x3) screws to secure the display hinge to the display assembly. Next steps 1. Install the display panel. 2. Install the display hinge caps. 3. Install the display bezel.

  • Page 87: Installing Display Cable

    3. Remove the battery. 4. Remove the display assembly. 5. Remove the display bezel. 6. Remove the display hinge caps. 7. Remove the display panel. 8. Remove the camera. About this task The figure indicates the location of the display cable and provides a visual representation of the removal procedure. Steps Peel the conductive tape and unroute the display cable to release it from adhesive and lift the display cable from the display back cover.

  • Page 88: Display Back Cover Assembly

    Steps 1. Adhere the display cable to the display back cover. 2. Adhere the conductive tape and route the display cable to the display back cover. Next steps 1. Install the camera. 2. Install the display panel. 3. Install the display hinge caps.

  • Page 89: Palmrest Assembly

    2. Remove the base cover. 3. Remove the battery. 4. Remove the display assembly. 5. Remove the display bezel. 6. Remove the display hinge caps. 7. Remove the display hinges. 8. Remove the display panel. 9. Remove the camera. 10. Remove the display cable.
  • Page 90 2. Remove the base cover. 3. Remove the battery. 4. Remove the 2280 SATA SSD. 5. Remove the memory. 6. Remove the WLAN card. 7. Remove the WWAN card. 8. Remove the inner frame. 9. Remove the board. 10. Remove the DC-in. 11.
  • Page 91 Next steps 1. Install the display assembly. 2. Install the smart card reader. 3. Install the keyboard. 4. Install the system board. NOTE: System board can be installed with heatsink attached. 5. Install the DC-in. 6. Install the board. 7. Install the inner frame.

  • Page 92: Troubleshooting

    Running the ePSA diagnostics Steps 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 93: Wifi Power Cycle

    For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected. The following table shows different power and battery-status light patterns and associated problems.

  • Page 94: 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 1.

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