Inspiron 7391 Service Manual Regulatory Model: P114G Regulatory Type: P114G001
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. © 2018 - 2019 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries.
Contents 1 Safety instructions....................................................................................................................... 5 Before working inside your computer................................................................................................................................. 5 Before you begin .............................................................................................................................................................
Removing the display assembly................................................................................................................................... 33 Installing the display assembly......................................................................................................................................36 I/O board...........................................................................................................................................................................
1 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 you have read the safety information that shipped with your computer. NOTE: Before working inside your computer, read the safety information that shipped with your computer. For more safety best practices, see the Regulatory Compliance home page at www.dell.com/regulatory_compliance.
NOTE: If you are using a different operating system, see the documentation of your operating system for shut-down instructions. 3. Disconnect your computer and all attached devices from their electrical outlets. 4. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer. 5. Remove any media card and optical disc from your computer, if applicable.
• • • • Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts that are insulators and often highly charged. Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For example, deploying the kit for a server environment is different than for a desktop or portable environment.
2 Removing and installing components Recommended tools The procedures in this document may require the following tools: • • • Phillips screwdriver #1 Flat-head screwdriver Plastic scribe Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is restored when the component is replaced.
Component Secured to Screw type Quantity Left display hinge Display back-cover and antenna assembly M2.5x3.5 2 Hinges Display back-cover and antenna assembly M2.5x2.5 6 Display-cable bracket System board M2.5x3.5 1 Power-adapter port Palm-rest and keyboard assembly M2x3 1 Power button with fingerprint reader bracket Palm-rest and keyboard assembly M1.6x2 1 Power button with fingerprint reader Palm-rest and keyboard assembly M1.
Removing and installing components
Steps 1. Loosen the three captive screws on the base cover. 2. Remove the four screws (M2x6) that secure the base cover to the palm-rest and keyboard assembly. 3. Using a plastic scribe, pry the base cover from the palm-rest and keyboard assembly. 4. Lift the base cover off the palm-rest and keyboard assembly. Installing the base cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
Steps 1. Place the computer with the hinges facing towards you. 2. Align the base cover on the palm-rest and keyboard assembly, and snap the base cover into place. 3. Replace the four screws (M2x6) that secure the base cover to the palm-rest and keyboard assembly. 4. Tighten the three captive screws that secure the base cover to the palm-rest and keyboard assembly. Next steps 1. Follow the procedure in After working inside your computer. Battery Removing the battery Prerequisites 1.
Steps 1. Disconnect the battery cable from the system board. 2. Remove the two screws (M2x2) that secure the battery to the palm-rest and keyboard assembly. 3. Remove the screw (M1.6x4) that secures the battery to the system board and palm-rest and keyboard assembly. 4. Lift the battery off the palm-rest and keyboard assembly. Installing the battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
Steps 1. Connect the battery cable to the system board. 2. Replace the two screws (M2x2) that secure the battery to the palm-rest and keyboard assembly. 3. Replace the screw (M1.6x4) that secures the battery to the system board and palm-rest and keyboard assembly. Next steps 1. Install the base cover. 2. Follow the procedure in After working inside your computer. Coin-cell battery Removing the coin-cell battery Prerequisites 1. Follow the procedure in Before working inside your computer.
Steps 1. Disconnect the coin-cell battery cable from the system board. 2. Remove the coin-cell battery cable from the routing guide. 3. Peel the coin-cell battery off the palm-rest and keyboard assembly. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
Steps 1. Adhere the coin-cell battery to the slot on the palm-rest and keyboard assembly. 2. Route the coin-cell battery cable through the routing guide. 3. Connect the coin-cell battery cable to the system board. Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in After working inside your computer. Solid-state drive Removing the M.2 2280 solid-state drive Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3.
Steps 1. Peel the mylar tape that secures the heat sink to the system board. 2. Remove the screw (M2x2.5) that secures the solid-state drive to the system board. 3. Slide and remove the solid-state drive from the solid-state drive slot on the system board. Installing the M.2 2280 solid-state drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive slot and slide the solid-state drive into the solid-state drive slot on the system board. 2. Replace the screw (M2x2.5) that secures the solid-state drive to the system board. 3. Adhere the mylar tape that secures the heat sink to the system board. Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in After working inside your computer. Removing the M.
About this task The following image indicates the location of the solid-state drive and provides a visual representation of the removal procedure. Steps 1. Peel the mylar tape that secures the heat sink to the system board. 2. Remove the screw (M2x2.5) that secures the solid-state drive bracket to the system board. 3. Slide and remove the solid-state drive bracket off the solid-state drive on the system board. 4. Slide and remove the solid-state drive off the solid-state drive slot on the system board.
Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive slot and slide the solid-state drive into the solid-state drive slot on the system board. 2. Slide the solid-state bracket on to the solid-state drive on the system board. 3. Replace the screw (M2x2.5) that secures the solid-state drive to the system board. 4. Adhere the mylar tape that secures the heat sink to the system board. Next steps 1. Install the battery. 2. Install the base cover. 3.
Heat sink Removing the heat sink Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. About this task The following image indicates the location of the heat sink and provides a visual representation of the removal procedure. Steps 1. Peel the mylar tape that secures the heat sink to the system board. 2. In the reverse sequential order (7>6>5>4>3>2>1), loosen the seven captive screws that secure the heat sink to the system board. 3.
Installing the heat sink 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 base cover and provides a visual representation of the installation procedure. Steps 1. Align and place the screw holes on the heat sink with the screw holes on the system board. 2.
Fan Removing the fan Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. About this task The following image indicates the location of fan and provides a visual representation of the removal procedure. Steps 1. Disconnect the I/O-board cable from the system board and I/O board. NOTE: This step is only applicable for computers shipped with a WWAN configuration. 2. Remove the two (M2x3) screws that secure the fan to the system board.
3. Lift the fan slightly off the palm-rest and keyboard assembly. 4. Disconnect the fan cable from the system board and completely lift the fan off the palm-rest and keyboard assembly. Installing the fan 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 fan and provides a visual representation of the installation procedure. Steps 1.
Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in After working inside your computer. Speakers Removing the speakers Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. About this task The following image indicates the location of speakers and provides a visual representation of the removal procedure.
Steps 1. Open the latch and disconnect the touchpad cable from the system board. 2. Disconnect the speaker cable from the system board. 3. Peel the tapes that secure the speaker cable to the palm-rest and keyboard assembly. 4. Note the routing of the speaker cable and remove the speaker cable from the routing guides on the palm-rest and keyboard assembly. NOTE: Note the position of the rubber grommets before lifting the speakers. 5.
Steps 1. Using the alignment posts and rubber grommets, place the speakers in the slots on the palm-rest and keyboard assembly. 2. Route the speaker cable through the routing guides on the palm-rest and keyboard assembly. 3. Adhere the tapes that secure the speaker cable to the palm-rest and keyboard assembly. 4. Connect the speaker cable to the system board. 5. Connect the touchpad cable to the system board and close the latch to secure the cable. Next steps 1. Install the battery. 2.
Steps 1. Peel the mylar tape that secures the heat sink to the system board. 2. Remove the screw (M2x2.5) that secures the WLAN-card bracket to the WLAN card and lift the WLAN-card bracket off the WLAN card. 3. Disconnect the antenna cables from the WLAN card. 4. Slide and remove the WLAN card from the WLAN-card slot. Installing the WLAN card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
Steps 1. Connect the antenna cables to the WLAN card. 2. Align the notch on the WLAN card with the tab on the WLAN card slot and insert the WLAN card at an angle into the WLAN card slot. 3. Align and place the WLAN card bracket on the WLAN card. 4. Replace the screw (M2x2.5) to secure the WLAN card bracket to the WLAN card. 5. Ahere the mylar tape that secures the heat sink to the system board. Next steps 1. Install the battery. 2. Install the base cover. 3.
Touchpad Removing the touchpad Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the battery. About this task The following image indicates the location of touchpad and provides a visual representation of the removal procedure. Steps 1. Peel the tapes that secure the touchpad to the palm-rest and keyboard assembly. 2. Open the latch and disconnect the touchpad cable from the system board. 3. Remove the three (M1.
Steps 1. Align and place the touchpad into the slot on the palm-rest and keyboard assembly. 2. Replace the two (M1.6x2) screws that secure the touchpad to the palm-rest and keyboard assembly. 3. Align and place the touchpad bracket into the slot on the palm-rest and keyboard assembly. 4. Replace the three (M1.6x2) screws that secure the touchpad bracket to the palm-rest and keyboard assembly. 5. Slide the touchpad cable into its connector on the system board and close the latch to secure the cable. 6.
Steps 1. Disconnect the power-adapter port cable from the system board. 2. Remove the screw (M2x3) that secures the power-adapter port to the palm-rest and keyboard assembly. 3. Lift the power-adapter port, along with its cable, off the palm-rest and keyboard assembly. Installing the power-adapter port Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
Steps 1. Connect the power-adapter port cable to the system board. 2. Replace the screw (M2x3) that secures the power-adapter port to the palm-rest and keyboard assembly. Next steps 1. 2. 3. 4. 5. Install the display assembly. Install the WLAN card. Install the battery. Install the base cover. Follow the procedure in After working inside your computer. Display assembly Removing the display assembly Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3.
Removing and installing components
Steps 1. Remove the two screws (M2x4) that secure the left and right display hinges to the I/O board and palm-rest and keyboard assembly. 2. Peel the tape and using the pull tab, remove the display cable from the system board. 3. Open the display assembly as far as possible. 4. Remove the palm-rest and keyboard assembly off the display assembly.
Installing the display assembly 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 display assembly and provides a visual representation of the installation procedure.
Steps 1. Align and place the palm-rest and keyboard assembly on the display assembly. 2. Using the alignment posts, close the display hinges. 3. Replace the two screws (M2x4) that secures the left and right display hinge to the I/O board and palm-rest and keyboard assembly. 4. Connect the display cable on to the connector on the system board and adhere the tape that secures the display cable to the system board. Next steps 1. Install the battery. 2. Install the base cover. 3.
Steps 1. Remove the screw (M2x4) that secure the left display hinge to the palm-rest and keyboard assembly. 2. Open the display hinges at an angle of 90 degrees. 3. Peel the mylar tape that secures the I/O board to the palm-rest and keyboard assembly. 4. Peel the tape that secures the I/O-board cable to the I/O board. 5. Open the latch and disconnect the I/O-board cable from the I/O board. 6. Remove the screw (M2.5x2.5) that secures the I/O board to the palm-rest and keyboard assembly. 7.
Steps 1. Align and place the I/O board on the palm-rest and keyboard assembly. 2. Replace the screw (M2x3) that secures the I/O board to the palm-rest and keyboard assembly. 3. Replace the screw (M2.5x2.5) that secures the I/O board to the palm-rest and keyboard assembly. 4. Connect the I/O-board cable to the I/O board and close the latch to secure the cable. 5. Adhere the tape that secures the I/O board to the I/O board. 6. Adhere the Mylar that secures the I/O board to the palm-rest and keyboard assembly.
Power-button board Removing the power-button board Prerequisites 1. 2. 3. 4. 5. 6. Follow the procedure in Before working inside your computer. Remove the base cover. Remove the battery. Remove the WLAN card. Remove the fan. Remove the I/O board. About this task The following image indicates the location of power button and provides a visual representation of the removal procedure. Steps 1. Remove the screw (M1.6x2) that secures the power-button bracket to the palm-rest and keyboard assembly. 2.
Steps 1. Align the screw hole on the power-button board with the screw hole on the palm-rest and keyboard assembly. 2. Replace the screw (M1.6x2) that secures the power-button board to the palm-rest and keyboard assembly. 3. Align the screw hole on the power-button bracket with the screw hole on the palm-rest and keyboard assembly. 4. Replace the screw (M1.6x2) that secures the power-button bracket to the palm-rest and keyboard assembly. Next steps 1. 2. 3. 4. 5. 6. Install the I/O board. Install the fan.
About this task The following image indicates the location of power button with fingerprint reader and provides a visual representation of the removal procedure.
Steps 1. Peel the tape that secures the fingerprint-reader board to the palm-rest and keyboard assembly. 2. Open the latch and disconnect the fingerprint-reader cable from the fingerprint-reader board. 3. Open the latch and disconnect the fingerprint-reader cable from the system board. 4. Lift the power button with fingerprint-reader, along with the power-button cable, off the palm-rest and keyboard assembly. 5. Peel the Mylar that secures the power-button bracket to the keyboard and palm-rest assembly. 6.
Removing and installing components
Steps 1. Align and place the power button with fingerprint reader on the palm-rest and keyboard assembly. 2. Replace the screw (M1.6x2) that secure the power button with fingerprint reader to the palm-rest and keyboard assembly. 3. Align the screw holes on the power-button bracket with the screw holes on the palm-rest and keyboard assembly. 4. Replace the three screws that secures the power-button bracket to the palm-rest and keyboard assembly. 5.
System board Removing the system board Prerequisites 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 M.2 2280 solid-state drive or M,2 2230 solid-state drive, whichever applicable. Remove the WLAN card. Remove the fan. Remove the heat sink. About this task The following image indicates the location of system board and provides a visual representation of the removal procedure.
Steps 1. Peel the tape that secures the I/O-board cable to the system board. 2. Open the latch and disconnect the I/O-board cable from the system board. 3. Disconnect the speaker cable from the system board. 4. Open the latch and disconnect the fingerprint-reader cable from the system board. 5. Open the latch and disconnect the touchpad cable from the system board. 6. Open the latch and disconnect the keyboard cable from the system board. 7.
Steps 1. Slide the ports on the system board into the slots on the palm-rest and keyboard assembly and align the screw holes on the system board with the screw holes on the palm-rest and keyboard assembly. 2. Replace the screw (M2x4) that secures the system board to palm-rest and keyboard assembly. 3. Connect the display cable on to the connector on the system board6 4. Connect the power-adapter port cable to the system board. 5. Connect the coin-cell battery cable to the system board. 6.
3. 4. 5. 6. 7. 8. 9. Install the heat sink. Install the fan. Install the WLAN card. Install the M.2 2280 solid-state drive or M.2 2230 solid-state drive, whichever applicable. Install the battery. Install the base cover. Follow the procedure in After working inside your computer. Palm-rest and keyboard assembly Removing the palm-rest and keyboard assembly Prerequisites 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Follow the procedure in Before working inside your computer. Remove the base cover. Remove the battery.
Installing the palm-rest and keyboard assembly Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the palm-rest and keyboard assembly and provides a visual representation of the installation procedure. Steps Place the palm-rest and keyboard assembly on a flat surface. Next steps 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 50 Install the touchpad. Install the power-adapter port.
3 Device drivers Intel Chipset Software Installation Utility In the Device Manager, check if the chipset driver is installed. Install the Intel chipset updates from www.dell.com/support. Video drivers In the Device Manager, check if the video driver is installed. Install the video driver update from www.dell.com/support. Intel Serial IO driver In the Device Manager, check if the Intel Serial IO driver is installed. Install the driver updates from www.dell.com/support.
4 System setup NOTE: Depending on the computer and its installed devices, the items listed in this section may or may not be displayed. Topics: • • • • • • • System setup Entering BIOS setup program Navigation keys Boot Sequence System setup options Clearing CMOS settings Clearing BIOS (System Setup) and System passwords System setup CAUTION: Unless you are an expert computer user, do not change the settings in the BIOS Setup program. Certain changes can make your computer work incorrectly.
Keys Navigation Tab Moves to the next focus area. Esc Moves to the previous page until you view the main screen. Pressing Esc in the main screen displays a message that prompts you to save any unsaved changes and restarts the system. Boot Sequence Boot Sequence allows you to bypass the System Setup–defined boot device order and boot directly to a specific device (for example: optical drive or hard drive).
Overview Processor Type Displays the processor type. Maximum Clock Speed Displays the maximum processor clock speed. Core Count Displays the number of cores on the processor. Processor L2 Cache Displays the processor L2 Cache size. Processor ID Displays the processor identification code. Processor L3 Cache Displays the processor L3 Cache size. Current Clock Speed Displays the current processor clock speed. Minimum Clock Speed Displays the minimum processor clock speed.
Boot options UEFI Boot Path Security Enables or disables the system to prompt the user to enter the Admin password when booting a UEFI boot path from the F12 boot menu. Default: Always Except Internal HDD. Table 4. System setup options—System Configuration menu System Configuration Date/Time Date Sets the computer date in MM/DD/YYYY format. Changes to the date take effect immediately. Time Sets the computer time in HH/MM/SS 24-hour format. You can switch between 12hour and 24-hour clock.
System Configuration Keyboard Backlight Timeout on Battery Configures the timeout value for the keyboard when the computer is running on battery. The keyboard backlight timeout value is only effect when the backlight is enabled. Default: 10 seconds. Touchscreen Enables or disables the touchscreen for the operating system. NOTE: Touchscreen will always work in the BIOS setup irrespective of this setting. Default: ON. Table 5.
Security Intel SGX Enables or disables the Intel Software Guard Extensions (SGX) to provide a secured environment for running code/storing sensitive information. Default: Software Control SMM Security Mitigation Enables or disables additional UEFI SMM Security Mitigation protections. Default: OFF. NOTE: This feature may cause compatibility issues or loss of functionality with some legacy tools and applications. Enable Strong Passwords Enables or disables strong passwords. Default: OFF.
Performance Intel SpeedStep Enables or disables the Intel SpeedStep Technology to dynamically adjust processor voltage and core frequency, decreasing average power consumption and heat production. Default: ON. Intel TurboBoost Technology Enabled or disabled the Intel TurboBoost mode of the processor. If enabled, the Intel TurboBoost driver increases the performance of the CPU or graphics processor. Default: ON. Multi-Core Support Changes the number of CPU cores available to the operating system.
Table 11. System setup options—Wireless menu Wireless Wireless Switch Determines which wireless devices can be controlled by the Wireless Switch. For Windows 8 systems, this is controlled by an operating system drive directly. As a result, the setting does not affect the Wireless Switch behavior. NOTE: When both WLAN and WiGig are present, enable/disable controls are tied together. Thus, they cannot be enabled or disabled independently. WLAN Default: ON. Bluetooth Default: ON.
Virtualization VT for Direct I/O Enables the computer to perform Virtualization Technology for Direct I/O (VT-d). VT-d is an Intel method that provides virtualization for memory map I/O. Default: ON. Table 14. System setup options—Maintenance menu Maintenance Asset Tag Creates a system Asset Tag that can be used by an IT administrator to uniquely identify a particular system. Once set in BIOS, the Asset Tag cannot be changed. Service Tag Displays the Service Tag of the computer.
Clearing CMOS settings About this task CAUTION: Clearing CMOS settings will reset the BIOS settings on your computer. Steps 1. Remove the base cover. 2. Disconnect the battery cable from the system board. 3. Remove the coin-cell battery. 4. Wait for one minute. 5. Replace the coin-cell battery. 6. Connect the battery cable to the system board. 7. Replace the base cover.
5 Troubleshooting Enhanced Pre-Boot System Assessment (ePSA) diagnostics About this task 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.
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. Table 17.
M-BIST About this task The M-BIST (Built-In Self-Test) diagnostics tool allows users to diagnose system-board failures. NOTE: M-BIST can be manually-initiated before POST (Power-On Self-Test). How to run M-BIST? M-BIST must be initiated from a power-off state with the computer either connected to the supplied AC power adapter or running on a fully-charged battery. Steps 1. From the power-off state, press and hold both the M key on the keyboard and the power button to initiate M-BIST. 2.
You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their primary operating system due to software or hardware failures. For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at www.dell.com/ support. Flashing BIOS (USB key) Steps 1. Follow the procedure from step 1 to step 7 in "Flashing the BIOS" to download the latest BIOS setup program file. 2. Create a bootable USB drive.
7. Turn on your computer. Wi-Fi power cycle About this task If your computer is unable to access the Internet due to Wi-Fi connectivity issues a Wi-Fi power cycle procedure may be performed. The following procedure provides the instructions on how to conduct a Wi-Fi power cycle: NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device. Steps 1. Turn off your computer. 2. Turn off the modem. 3. Turn off the wireless router. 4. Wait for 30 seconds. 5. Turn on the wireless router. 6.
6 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 19. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell Tips Contact Support In Windows search, type Contact Support, and press Enter. Online help for operating system www.dell.com/support/windows www.dell.
