Dell Latitude 7400 Service Manual Regulatory Model: P100G Regulatory Type: P100G001
Notes, cautions, and warnings NOTE: A NOTE indicates important information that helps you make better use of your product. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2019 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries.
Contents 1 Working on your computer............................................................................................................ 6 Safety instructions.................................................................................................................................................................6 Before working inside your computer........................................................................................................................... 6 Safety precautions.....
Installing the power adapter port.................................................................................................................................37 Speakers............................................................................................................................................................................... 38 Removing the speakers...........................................................................................................................................
Flashing the BIOS................................................................................................................................................................ 85 Backup media and recovery options................................................................................................................................. 86 WiFi power cycle.....................................................................................................................................................
1 Working on your computer Safety instructions Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions exist: • • You have read the safety information that shipped with your computer. A component can be replaced or, if purchased separately, installed by performing the removal procedure in reverse order.
Safety precautions The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions. Observe the following safety precautions before you perform any installation or break/fix procedures involving disassembly or reassembly: • • • • • • Turn off the system and all attached peripherals. Disconnect the system and all attached peripherals from AC power. Disconnect all network cables, telephone, and telecommunications lines from the system.
ESD field service kit The unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components: antistatic mat, wrist strap, and bonding wire. Components of an ESD field service kit The components of an ESD field service kit are: • • • • • • • Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures.
5. Keep your back upright, whether lifting or setting down the load. Do not add the weight of your body to the load. Avoid twisting your body and back. 6. Follow the same techniques in reverse to set the load down. After working inside your computer After you complete any replacement procedure, ensure that you connect any external devices, cards, and cables before turning on your computer. 1. Connect any telephone or network cables to your computer.
2 Technology and components This chapter details the technology and components available in the system. Topics: • • • USB features USB Type-C HDMI 1.4a USB features Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers. Let's take a quick look on the USB evolution referencing to the table below. Table 1.
• USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a 10-fold increase in theoretical bandwidth. With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices, high megapixel count digital cameras etc., USB 2.0 may not be fast enough. Furthermore, no USB 2.
“alternate modes,” which allows you to have adapters that can output HDMI, VGA, DisplayPort, or other types of connections from that single USB port USB Power Delivery The USB PD specification is also closely intertwined with USB Type-C. Currently, smartphones, tablets, and other mobile devices often use a USB connection to charge. A USB 2.0 connection provides up to 2.5 watts of power — that'll charge your phone, but that's about it. A laptop might require up to 60 watts, for example.
5. Up to 40 Gbps NOTE: Data transfer speed may vary between different devices. Thunderbolt Icons Figure 2. Thunderbolt Iconography Variations HDMI 1.4a This topic explains the HDMI 1.4a and its features along with the advantages. HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface.
3 Major components of your system 1. Base cover 2.
3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Heatsink assembly Memory System board Coin-cell Solid state drive Battery Speakers Smart card reader Touchpad button board LED daughterboard Display assembly Palmrest assembly WLAN card WWAN card NOTE: Dell provides a list of components and their part numbers for the original system configuration purchased. These parts are available according to warranty coverages purchased by the customer. Contact your Dell sales representative for purchase options.
4 Removing and installing components Base cover Removing the base cover Follow the procedure in before working inside your computer. 1. Loosen the eight captive screws that secure the base cover to the computer. 2. Use a plastic scribe to pry the base cover at the indents near the left and right hinges [1]. 3. Work along the edges to separate the base cover from the computer [2].
4. Lift and remove the base cover from the computer.
Installing the base cover 1. Align and place the base cover on the computer. 2. Press along the edges of the base cover until it clicks into the palmrest assembly.
3. Tighten the eight captive screws to secure the base cover to the computer.
Follow the procedure after working inside your computer. Battery Lithium-ion battery precautions CAUTION: • Exercise caution when handling Lithium-ion batteries. • Discharge the battery as much as possible before removing it from the system. This can be done by disconnecting the AC adapter from the system to allow the battery to drain. • Do not crush, drop, mutilate, or penetrate the battery with foreign objects.
Installing the battery 1. Align and place the battery in the computer [1]. 2. Tighten the two captive screws [2] to secure the battery (4-Cell) to the computer. NOTE: A 3-Cell battery has single captive screw that secures the battery to the computer. 3. Connect the battery cable to its connector on the system board [3].
1. Install the base cover. 2. Follow the procedure after working inside your computer. Coin cell Removing the coin cell 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Disconnect the LED daughterboard cable from the connector on the system board [1]. 2. Peel back the LED daughterboard cable from over the coin cell [2].
3. Disconnect the coin cell cable from the connector on the system board [1]. 4. Remove the coin cell from the computer [2].
Installing the coin cell 1. Connect the coin cell cable to its connector on the system board [1] and adhere the coin cell to the palmrest [2].
2. Connect the LED board cable to the system board [1] and route the ribbon cable over the coin cell [2].
1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Memory Removing the memory 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Pry the clips securing the memory module until the memory module pops-up [1]. 2. Lift the memory module away from the connector [2]. Installing the memory Insert the memory module on the memory connector until the clips secure the memory module.
1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Solid state drive Removing the solid state drive 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. NOTE: This procedure illustrates a M.2 2280 SSD. M.2 2230 SSD is secured to the palmrest with special bracket and plate. Loosen the three captive screws that secure the SSD bracket to the palmrest [1]. 2.
3. Slightly lift and remove the SSD out from its connector on the system board.
Installing the solid state drive 1. Place the SSD on its slot and slide it to its connector on the system board. 2. Place the SSD plate pre-installed with thermal sticker on the underside over the SSD [1]. 3. Tighten the three captive screws to secure the SSD bracket to the palmrest [2].
NOTE: This procedure illustrates a M.2 2280 SSD. M.2 2230 SSD requires a special bracket and plate to secure it to the palmrest assembly. 1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. WLAN card Removing the WLAN card 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Remove the single (M2x3) screw that secures the metal bracket to the WLAN card [1]. 2.
Installing the WLAN card 1. Insert the WLAN card into its slot on the system board [1]. 2. Connect the antennae cables to the connectors on the WLAN card [2]. 3. Place the metal bracket over the antennae connectors [3]. 4. Replace the single (M2x3) screw to secure the metal bracket to the WLAN card and the system board [4].
1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. WWAN card Removing the WWAN card 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Remove the single (M2x3) screw that secures the metal bracket to the WWAN card [1]. 2. Remove the metal bracket [2] and disconnect the antennae cables from the connectors on the WWAN card [3]. 3.
Installing the WWAN card 1. Place the WWAN card into its connector on the system board [1]. 2. Connect the antennae cables to the connectors on WWAN card [2]. 3. Place the metal bracket over the antennae connectors on the WWAN card [3]. 4. Replace the single (M2x3) screw to secure the metal bracket to the WWAN card and the system board [4].
1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Heatsink Removing the heatsink fan assembly 1. 2. 3. 4. 1. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the WWAN card. NOTE: Heatsink and Fan are separately orderable parts. Disconnect the fan cable from the connector on the system board [1]. 2.
4. Remove the single screw securing the fan to heatsink. Installing the heatsink assembly 1. NOTE: Heatsink and Fan are separately orderable parts. Install the single screw securing the fan to the heatsink.
2. Place the heatsink fan assembly in the computer [1]. 3. Replace the two (M2x3) screws in sequence (2 > 1) on fan case and four (M2x3) screws in sequence (4 > 3 > 2 > 1) on the heatsink fan assembly [1]. 4. Connect the fan cable to the system board [2]. 1. 2. 3. 4. 36 Install the WWAN card. Install the battery. Install the base cover. Follow the procedure after working inside your computer.
Power adapter port Removing the power adapter port 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Remove the single (M2x3) screw from the metal bracket on the power adapter port [1]. 2. Remove the metal bracket that secures the power adapter port [2]. 3. Disconnect the power adapter port cable from the system board [1]. 4. Lift and remove the power adapter port from its slot in the palmrest [2]. Installing the power adapter port 1.
3. Replace the metal bracket over the power adapter port [1]. 4. Replace the single (M2x3) screw to secure the power adapter port to the palmrest assembly [2]. 1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Speakers Removing the speakers 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Disconnect the speaker cable from its connector on the system board [1]. 2.
4. Remove the four (M2x3) screws securing the speakers to the palmrest assembly [1]. 5. Lift and remove the speakers from the palmrest assembly [2].
Installing the speakers 1. Align and place the speakers into the palmrest assembly [1]. 2. Replace the four (M2x3) screws to secure the speakers to the palmrest assembly [2].
3. Adhere the tape to secure the speaker cable on the touchpad button board [1]. 4. Route the speaker cable [2] and connect the speaker cable to the connector on the system board [3].
1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. LED Board Removing the LED daughterboard 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Disconnect the LED board ribbon cable from the connector on the system board [1]. 2. Remove the single (M2x3) screw [2] and lift the LED daughterboard from the palmrest assembly [3].
Installing the LED daughterboard 1. Align and place the LED daughterboard on the palmrest assembly [1]. 2. Replace the single (M2x3) screw securing the LED daughterboard to the palmrest assembly [2]. 3. Connect the LED daughterboard ribbon cable to the system board [3].
1. 2. 3. 4. Connect the speaker cable Install the battery. Install the base cover. Follow the procedure after working inside your computer. Touchpad button board Removing the touchpad button board 1. 2. 3. 4. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the speaker. 1. Disconnect the touchpad button board cable from the touchpad module [1]. 2. Remove the two (M2x2.5) screws that secures touchpad button board to the palmrest assembly [2].
Installing the touchpad button board 1. Place the touchpad button board on the palmrest assembly [1]. 2. Replace the two (M2x2.5) screws to secure it to the palmrest assembly [2]. 3. Connect the touch pad button board cable to the touchpad module [3].
1. 2. 3. 4. Install the speaker. Install the battery. Install the base cover. Follow the procedure after working inside your computer. Smart card reader Removing the smart card reader 1. 2. 3. 4. 5. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the SSD. Remove the speaker. 1. Disconnect the smart card reader cable from the USH board [1]. 2. Disconnect the touchpad button cable from the tocuhpad module [2]. 3. Remove the four (M2x2.
Installing the smart card reader 1. Replace the smart card reader into its slot on the palmrest assembly [1]. 2. Replace the four (M2x2.5) screws securing it to the palmrest assembly [2]. 3. Connect the touchpad button board cable to the touchpad module [3]. 4. Connect the smart card reader cable to the USH board [4].
1. 2. 3. 4. 5. Install the speakers. Install the SSD. Install the battery. Install the base cover. Follow the procedure after working inside your computer. Display assembly Removing the display assembly 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. 1. Open the display lid 180 degrees.
2. Remove the six (M2.5x4) screws [1] and remove the display assembly from the palmrest assembly [2].
Installing the display assembly 1. Replace the display assembly aligning the screw holes on the hinges with the screw holes on the palmrest assembly [1]. 2. Replace the six (M2.5x3.5) screws [2] to secure the display assembly to the computer [2]. 3. Close the LCD lid.
1. Install the battery. 2. Install the base cover. 3. Follow the procedure after working inside your computer. Hinge caps Removing the hinge cap 1. 2. 3. 4. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the display assembly. 1. Open the hinges to 90 degrees to the display assembly [1]. 2. Slide the hinge cap towards the right hinge and lift it away from the display assembly [2].
Installing the hinge cap 1. Slide the hinge cap towards the left hinge until it click locks on the display assembly [1]. 2. Close the hinges to 180 degrees to the display assembly [2].
1. 2. 3. 4. Install the display assembly Install the battery. Install the base cover. Follow the procedure after working inside your computer. Display Hinges Removing the hinges 1. 2. 3. 4. 5. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the display assembly. Remove the hinge cap. 1. Unroute the antennae and display cable away from the hinges.
2. Remove the four (M2.5x5) screws [1] securing the hinges to the display assembly. 3. Lift and remove the hinges from the display back cover assembly [2].
Installing the hinges 1. Align and place the hinges on the display assembly [1]. 2. Replace the four (2.5x5) screws to secure hinges to the display back cover assembly [2].
3. Route the antennae and display cable along the hinges.
1. 2. 3. 4. 5. Install the hinge cap Install the display assembly Install the battery. Install the base cover. Follow the procedure after working inside your computer. Display Bezel Removing the display bezel 1. 2. 3. 4. 5. 6. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the display assembly. Remove the hinge cap. Remove the hinges. 1. Use a plastic scribe to pry at the indents on the bottom of display assembly beside the hinges [1]. 2.
1. 2. 3. 4. 5. 6. Install the hinges. Install the hinge cap Install the display assembly Install the battery. Install the base cover. Follow the procedure after working inside your computer. Display Panel Removing the display panel 1. 2. 3. 4. 5. 6. 7. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the display assembly. Remove the hinge cap. Remove the hinges. Remove the display bezel. 1.
2. NOTE: Do not pull and release the Stretch (SR) tapes from the display panel. There is no need to separate the brackets from the display panel. Peel back the tape [1] and flip open the latch [2] to disconnect the EDP cable from the display panel [3].
Installing the display panel 1. Connect the EDP cable to the connector on the display panel [1] and close the actuator to secure the connector [2]. 2. Adhere the adhesive tape over the EDP connector on the display panel [3] and flip over the display panel on the back cover [4].
1. Install the display bezel. 2. Install the hinges. 3.
4. 5. 6. 7. Install the display assembly Install the battery. Install the base cover. Follow the procedure after working inside your computer. Camera—microphone module Removing the camera—microphone module 1. 2. 3. 4. 5. 6. 7. 8. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the display assembly. Remove the hinge cap. Remove the hinges. Remove the display bezel. Remove the display panel. 1.
1. 2. 3. 4. 5. 6. 7. 8. Install the display panel. Install the hinges. Install the display bezel. Install the hinge cap Install the display assembly Install the battery. Install the base cover. Follow the procedure after working inside your computer. Display Cable Removing the display cable 1. 2. 3. 4. 5. 6. 7. 8. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the display assembly. Remove the hinge cap. Remove the display bezel.
Installing the display cable 1. Adhere the display cable along the routing channel on the display back cover assembly [1] . 2. Connect the display cable to the camera microphone module and replace the tape on the connector [2].
1. 2. 3. 4. 5. 6. 7. 8. Install the display panel. Install the hinges. Install the display bezel. Install the hinge cap Install the display assembly Install the battery. Install the base cover. Follow the procedure after working inside your computer. System board Removing the system board 1. 2. 3. 4. 5. 6. 7. 8. 9. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the memory. Remove the SSD. Remove the WLAN card.
3. Disconnect the display cable [1] and unroute it from the metal bracket on the system board [2]. 4. Remove the single (M2x4) screw [1] and remove the metal bracket over the WWAN Darwin antennae cable [2]. 5. Disconnect the power button (with finger print reader) cable from the system board [1]. 6. Disconnect the WWAN Darwin antennae cables [2] from the system board.
7. Remove the two (M2x4) screws [1] and lift up the USB Type-C bracket from the system board [2]. 8. Disconnect the coin cell [1], speaker cable [2] and the LED daughterboard cable [3] from the system board.
9. Disconnect the USH daughterboard [1] and touchpad cables [2] from the system board.
10. Remove the two (M2x2.5) screws on the DDR ESD bracket [1] and lift to remove it from the system board [2]. 11. Remove the two (M2x4) screws [1] and remove the system board from the palmrest assembly [2]. NOTE: For models shipped with a fingerprint reader or WWAN antennas, there are three (M2x3) screws securing the system board to the computer.
Installing the system board 1. Align and place the system board in the palmrest assembly [1] 2. Replace the two (M2x4) screws on the system board securing it to the palmrest assembly [2].
NOTE: For models shipped with a fingerprint reader or WWAN antennas, there are three (M2x4) screws securing the system board to the computer. 3. Place the USB Type-C bracket [1] on the system board and secure it using two (M2x5) screws [2] to the system board. 4. Install the DDR ESD bracket [1] on the system board and secure it using two (M2x2.
5. Open the latch and connect the USH board cable [1] and the touchpad cable [2] to the system board.
6. Connect the coin cell [1], speaker cable [2], and the LED daughterboard ribbon cable [3] to the system board. 7. Install the metal bracket on the Darwin connector [1] and secure it to the palmrest using a single (M2x4) screw [2] to the system board. 8. Route the display cable through the metal bracket [1] and connect it to the system board [2].
9. Install the display cable bracket [1] on the EDP connector of the system board and secure it using a single (M2x3) screw [2]. 10. Connect the power button (with finger print reader) cable to the system board [1]. 11. Connect the Darwin WWAN antenna cables [2] to the the system board. 1. Install the display assembly 2. Install the power adapter port. 3. Install the heatsink-fan assembly.
4. 5. 6. 7. 8. 9. Install the WLAN card. Install the SSD. Install the memory. Install the battery. Install the base cover. Follow the procedure after working inside your computer. Power-Button Board Removing the power-button board 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Follow the procedure in before working inside your computer. Remove the base cover. Remove the battery. Remove the memory. Remove the SSD. Remove the WLAN card. Remove the heatsink-fan assembly. Remove the power adapter port.
Figure 3.
Figure 4. Removing the power-button board with FPR Installing the power-button board 1. Align and place the power-button board in to its slot on the plamrest assembly [1]. 2. Replace the two (M2x2.5) screws to secure the power-button board to the palmrest assembly [2].
Figure 5.
Figure 6. Installing the power-button board with FPR NOTE: Power-button board with finger print reader, has a cable that connects to the system board. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Install the system board. Install the touchpad buttons. Install the display assembly Install the power adapter port. Install the heatsink-fan assembly. Install the WLAN card. Install the SSD. Install the memory. Install the battery. Install the base cover. Follow the procedure after working inside your computer.
8. 9. 10. 11. 12. Remove the power adapter port. Remove the display assembly. Remove the system board. Remove the coin cell. Remove the power-button board. 1. Lift the latch and disconnect the keyboard cable [1] and the backlight cable [2] from the touchpad module. 2. NOTE: This image shows disassembly of a carbon fiber variant, an Aluminum variant of this model has 21 M1.6x2 screws securing the keyboard assembly to palmrest. Remove the 19 (M1.
Installing the keyboard 1. NOTE: The keyboard has multiple snap points on the lattice side which must be pushed down firmly at the snap points in order to secure and fit it to the replacement keyboard. Align the keyboard to the keyboard support plate [1] and replace the two (M2x2) screws [2]. 2. Place the keyboard assembly in the palmrest [1] and secure it with the 17 (M1.6x2) screws [2]. NOTE: This image shows disassembly of a carbon fiber variant, an Aluminum variant of this model has 21 M1.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Install the power button. Install the coin cell. Install the system board. Install the display assembly Install the power adapter port. Install the heatsink-fan assembly. Install the WLAN card. Install the SSD. Install the memory. Install the battery. Install the base cover. Follow the procedure after working inside your computer. Palmrest 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 82 Follow the procedure in before working inside your computer. Remove the base cover.
12. 13. 14. 15. 16. Remove the touchpad buttons. Remove the system board. Remove the coin cell. Remove the power button. Remove the keyboard. 1. After removing these components, you are left with the palmrest assembly. 2. Install the following components to the new palmrest assembly: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Install the keyboard. Install the power button. Install the coin cell. Install the system board. Install the display assembly Install the speaker. Install the LED board.
5 Troubleshooting Enhanced Pre-Boot System Assessment (ePSA) diagnostics The ePSA diagnostics (also known as system diagnostics) performs a complete check of your hardware. The ePSA is embedded with the BIOS and is launched by the BIOS internally.
Table 2. LED codes Diagnostic light codes Problem description 2,1 Processor failure 2,2 System board: BIOS or ROM (Read-Only Memory) failure 2,3 No memory or RAM (Random-Access Memory) detected 2,4 Memory or RAM (Random-Access Memory) failure 2,5 Invalid memory installed 2,6 System-board or chipset error 2,7 Display failure 2,8 LCD power rail failure.
5. Select the operating system installed on your computer. 6. Scroll down the page and expand BIOS. 7. Click Download to download the latest version of the BIOS for your computer. 8. After the download is complete, navigate to the folder where you saved the BIOS update file. 9. Double-click the BIOS update file icon and follow the instructions on the screen. Backup media and recovery options It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows.
6 Getting help Topics: • Contacting Dell Contacting Dell NOTE: If you do not have an active Internet connection, you can find contact information on your purchase invoice, packing slip, bill, or Dell product catalog. Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues: 1. Go to Dell.com/support. 2.
