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Dell Precision 7865 Tower Service Manual
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Dell Precision 7865 Tower Service Manual

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Precision 7865 Tower
Service Manual
Regulatory Model: D03T
Regulatory Type: D03T002
July 2022
Rev. A00

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Summary of Contents for Dell Precision 7865 Tower

  • Page 1 Precision 7865 Tower Service Manual Regulatory Model: D03T Regulatory Type: D03T002 July 2022 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2022 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

    After working inside your computer........................10 BitLocker..................................10 Chapter 2: Removing and installing components................11 Recommended tools................................11 Screw list....................................11 Major components of Precision 7865 Tower......................12 Side cover.................................... 14 Removing the side cover............................14 Installing the side cover.............................. 15 Front bezel ..................................17 Removing the front bezel............................17...
  • Page 4 Removing the PCIe holder............................35 Installing the PCIe holder............................36 Front fan....................................37 Removing the front-fan assembly........................... 37 Removing front fan..............................38 Installing the front fan..............................39 Installing the front-fan assembly..........................39 3.5-inch hard-drive assembly............................40 Removing the 3.5-inch hard-drive assembly......................40 Removing the 3.5-inch hard-drive bracket......................41 Installing the 3.5-inch hard-drive bracket......................
  • Page 5 Updating the BIOS from the F12 One-Time boot menu..................111 System and setup password............................112 Assigning a system setup password........................112 Deleting or changing an existing system setup password................113 Clearing BIOS (System Setup) and System passwords..................113 Chapter 5: Troubleshooting......................114 Dell SupportAssist Pre-boot System Performance Check diagnostics...............114 Contents...
  • Page 6 Running the SupportAssist Pre-Boot System Performance Check............... 114 Power-Supply Unit Built-in Self-Test .........................114 System-diagnostic lights..............................114 Recovering the operating system..........................117 Real Time Clock—RTC reset............................117 Backup media and recovery options..........................117 WiFi power cycle................................117 Chapter 6: Getting help and contacting Dell................119 Contents...

  • Page 7: Chapter 1: Working Inside Your Computer

    You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance 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 www.dell.com/regulatory_compliance.

  • Page 8: 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 9: Esd Field Service Kit

    Always place parts in your hand, on the ESD mat, in the system, or inside an anti-static bag. ● 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. Working inside your computer...

  • Page 10: Transporting Sensitive Components

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

  • Page 11: Chapter 2: Removing And Installing Components

    Removing and installing components NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Recommended tools The procedures in this document may require the following tools: ● Phillips screwdriver #0 ● Phillips screwdriver #1 ●...

  • Page 12: Major Components Of Precision 7865 Tower

    Voltage-Regulator heatsink - M3x5 Location 1 Voltage-Regulator heatsink - Captive Location 2 Voltage-Regulator heatsink - M3x5 Location 3 System board #6-32 Major components of Precision 7865 Tower The following image shows the major components of Precision 7865 Tower. Removing and installing components...
  • Page 13 Removing and installing components...

  • Page 14: Side Cover

    25. Air shroud 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.

  • Page 15: Installing The Side Cover

    Steps 1. Insert the side-cover key and turn the key clockwise to unlock the side cover. 2. Pull the release latch to release the side cover from the computer. 3. Open the side cover at an angle and lift the cover away from the chassis. Installing the side cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 16 Steps 1. Align the tabs on the side cover with the slots on the chassis. 2. Press the side cover back towards the side of the computer to secure it. NOTE: The release latch automatically locks the side cover to the computer. 3.

  • Page 17: Front Bezel

    Front bezel Removing the front bezel Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. About this task The following images indicate the location of the front bezel and provide a visual representation of the removal procedure. Steps 1.

  • Page 18: I/O Board

    Steps 1. Position the front bezel to align the tabs on the bezel with the slots on the chassis. 2. Press the bezel until the tabs clicks into place. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer.

  • Page 19: Installing The Front I/O Bracket

    Steps 1. Loosen the thumb screw on the front I/O bracket. 2. Move the top end of the front I/O bracket at an angle to free it from its slot on the chassis. 3. Remove the front I/O bracket from the computer. Installing the front I/O bracket Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 20: External Storage Flexbay (Hard Drive)

    External storage flexbay (Hard drive) Removing the external hard-drive assembly Prerequisites 1. Follow the procedure in Before working inside your computer. About this task The following images indicate the location of the external hard-drive assembly and provide a visual representation of the removal procedure.

  • Page 21: Removing The External 3.5-Inch Hard-Drive

    Steps 1. Slide and insert the hard-drive assembly into the external flexbay slot. 2. Close the release latch to secure the hard-drive assembly in place. Next steps 1. Follow the procedure in After working inside your computer. Removing the external 3.5-inch hard-drive Prerequisites 1.

  • Page 22: Installing The External 3.5-Inch Hard-Drive

    Steps 1. Pry the sides of the external hard-drive bracket to release the tabs on the bracket from the slots on the hard drive. 2. Lift and remove the hard drive off the external hard-drive bracket. Installing the external 3.5-inch hard-drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 23: Removing The External 2.5-Inch Hard-Disk Drive

    Steps 1. Place the hard drive into the external hard-drive bracket and align the tabs on the bracket with the slots on the hard drive. 2. Snap the hard-drive into the external hard-drive bracket. Next steps 1. Follow the procedure in After working inside your computer.

  • Page 24: Installing The External 2.5-Inch Hard-Drive

    Steps 1. Pry the sides of the external hard-drive bracket to release the tabs on the bracket from the slots on the hard drive. 2. Lift and remove the hard drive off the external hard-drive bracket. Installing the external 2.5-inch hard-drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 25: External Storage Flexbay (Solid-State Drive)

    Steps 1. Place the hard drive into the external hard-drive bracket and align the tabs on the bracket with the slots on the hard drive. 2. Snap the hard-drive into the external hard-drive bracket. Next steps 1. Follow the procedure in After working inside your computer.

  • Page 26: Removing The External M.2 2230 Solid-State Drive

    Steps 1. Push the release button on the external-flexbay bracket to open the release latch. 2. Hold the release latch and slide the solid-state drive assembly out of the external flexbay slot. Removing the external M.2 2230 solid-state drive Prerequisites 1.

  • Page 27: Installing The External M.2 2230 Solid-State Drive

    Steps 1. Remove the single (M3x6) screw and the two (M3x3) screws from the solid-state drive assembly. 2. Lift and remove the cover from the solid-state drive assembly. 3. Slide and remove the solid-state drive holder from the solid-state drive assembly. 4.

  • Page 28: Removing The External M.2 2280 Solid-State Drive

    Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive connector. 2. Insert the solid-state drive at a 45-degree angle into the slot on the solid-state drive assembly. 3. Align and place the solid-state drive bracket onto the solid-state drive assembly. 4.

  • Page 29: Installing The External M.2 2280 Solid-State Drive

    Steps 1. Remove the single (M3x6) screw and the two (M3x3) screws from the solid-state drive assembly. 2. Lift and remove the cover from the solid-state drive assembly. 3. Slide and remove the solid-state drive from the solid-state drive assembly. Installing the external M.2 2280 solid-state drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 30: Installing The External Solid-State Drive Assembly

    Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive connector. 2. Insert the solid-state drive at a 45-degree angle into the slot on the solid-state drive assembly. 3. Place the cover over the solid-state drive assembly. 4.

  • Page 31: Slim Optical-Drive

    Steps 1. Slide and insert the solid-state drive assembly into the external flexbay slot. 2. Push and close the release latch to secure the solid-state drive assembly in place. Next steps 1. Follow the procedure in After working inside your computer.

  • Page 32: Installing The Slim Optical-Drive

    Steps 1. Move the slim optical-drive latch to release it from the slot on the hard drive and optical-drive cage. 2. Slide and remove the slim optical-drive from the slot on the hard drive and optical-drive cage. Installing the slim optical-drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 33: Air Shroud

    Steps 1. Insert the slim optical-drive assembly into the slim optical-drive. 2. Slide the slim optical-drive assembly until it snaps into place. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer. Air shroud Removing the air shroud Prerequisites 1.

  • Page 34: Installing The Air Shroud

    Steps 1. Hold the air shroud at the gripping points. 2. Pull the air shroud upwards and out of the computer. Installing the air shroud 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 air shroud and provides a visual representation of the installation procedure.

  • Page 35: Pcie Holder

    Steps 1. Align the air shroud over the heat-sink and system board holding and seat it in the slot. 2. Press the air shroud down until the tabs clicks into place. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer.

  • Page 36: Installing The Pcie Holder

    About this task The following images indicate the location of the PCIe holder and provide a visual representation of the removal procedure. Steps 1. Remove the PCIe-power cables from the slots on the PCIe holder. 2. Push and hold the PCIe-holder latch upwards to release the PCIe holder. 3.

  • Page 37: Front Fan

    Steps 1. Align and place the PCIe holder on the slot over the front fan. 2. Push the latch down to secure the PCIe holder to the chassis. 3. Reconnect the PCIe-power cables to the slots on the PCIe holder. Next steps 1.

  • Page 38: Removing Front Fan

    About this task The following images indicate the location of the front-fan assembly and provide a visual representation of the removal procedure. Steps 1. Remove the single (M3x5) screw from the fan assembly. 2. Disconnect the fan cable from the connector on the system board. 3.

  • Page 39: Installing The Front Fan

    Steps 1. Locate the position of rubber grommets. 2. Gently pull the rubber grommets to release the fan from the fan cage. 3. Remove the fan from the fan cage. Installing the front fan 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 front fan and provide a visual representation of the installation procedure.

  • Page 40: 3.5-Inch Hard-Drive Assembly

    Steps 1. Align the tabs on the fan assembly with the slots on the chassis. 2. Insert the fan assembly at an angle into the slot in the chassis. 3. Install the single (M3x5) screw to secure the fan assembly to the chassis. 4.

  • Page 41: Removing The 3.5-Inch Hard-Drive Bracket

    Steps 1. Press the securing tabs to release the hard-drive assembly from the chassis. 2. Slide the hard-disk drive assembly out of the hard-drive bracket. Removing the 3.5-inch hard-drive bracket Prerequisites 1. Follow the procedure in before working inside your computer.

  • Page 42: Installing The 3.5-Inch Hard-Drive Bracket

    Steps 1. Pry the sides of the hard-drive bracket to release the tabs on the bracket from the slots on the hard drive. 2. Lift and remove the hard drive off the hard-drive bracket. Installing the 3.5-inch hard-drive bracket Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 43: Installing The 3.5-Inch Hard-Drive Assembly

    Steps 1. Place the hard drive into the hard-drive bracket and align the tabs on the bracket with the slots on the hard drive. 2. Snap the hard-drive into the hard-drive bracket. Next steps 1. Install the 3.5-inch hard-drive assembly. 2.

  • Page 44: 2.5-Inch Hard-Drive Assembly

    Steps Slide and insert the 3.5-inch hard-drive assembly into the slot on the hard-drive bracket. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer. 2.5-inch hard-drive assembly Removing the 2.5-inch hard-drive assembly Prerequisites 1.

  • Page 45: Removing The 2.5-Inch Hard-Disk Drive Bracket

    2. Remove the side cover. About this task The following images indicate the location of the 2.5-inch hard-drive assembly and provide a visual representation of the removal procedure. Steps 1. Press the securing tabs to release the hard-drive assembly from the chassis. 2.

  • Page 46: Installing The 2.5-Inch Hard-Drive Bracket

    3. Remove the 2.5-inch hard-drive assembly. About this task The following images indicate the location of the 2.5-inch hard-drive bracket and provide a visual representation of the removal procedure. Steps 1. Pry the sides of the hard-drive bracket to release the tabs on the bracket from the slots on the hard drive. 2.

  • Page 47: Installing The 2.5-Inch Hard-Drive Assembly

    Steps 1. Place the hard drive into the hard-drive bracket and align the tabs on the bracket with the slots on the hard drive. 2. Snap the hard-drive into the hard-drive bracket. Next steps 1. Install the 2.5-inch hard-drive assembly. 2.

  • Page 48: Rear Fans

    Steps Slide and insert the hard-drive assembly into the slot on the hard-drive bracket. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer. Rear fans Removing the rear-fan assembly Prerequisites 1. Follow the procedure in Before working inside your computer.

  • Page 49: Removing Rear Fan

    2. Remove the side cover. 3. Remove the shroud. About this task The following images indicate the location of the rear-fan assembly and provide a visual representation of the removal procedure. Steps 1. Remove the two (#6-32) screws from the fan assembly. 2.

  • Page 50: Installing The Rear Fan

    Steps 1. Remove the fan cable from the routing guide on the fan assembly. 2. Locate the position of rubber grommets. 3. Gently pull the rubber grommets inwards to release the fan from the fan cage. 4. Remove the fan from the fan cage. NOTE: Follow the same steps for the second fan.

  • Page 51: Installing The Rear-Fan Assembly

    Steps 1. Route the fan cable through the slot on the fan cage. 2. Place the fan inside the fan cage. 3. Insert the rubber grommets on the fan cage. 4. Align the slots on the fan with the rubber grommets on the fan cage. 5.

  • Page 52: Memory Modules

    Steps 1. Align the tabs on the fan assembly with the slots on the chassis. 2. Insert the fan assembly at an angle into the slot in the chassis. 3. Install the two (#6-32) screws to secure the fan assembly to the chassis. 4.

  • Page 53: Installing The Memory Module

    About this task The following image indicates the location of the memory module and provide a visual representation of the removal procedure. Steps 1. Pull the securing clips from both side of the memory module until the memory module pops up. 2.

  • Page 54: M.2 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 and 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 55: Installing The M.2 2230 Pcie Solid-State Drive

    Steps 1. Loosen the four captive screws that secures the M.2 heat-sink to the system board. 2. Lift and remove the M.2 heat-sink from the computer. 3. Remove the single (M2x3.5) screws that secures the solid-state drive to the system board. NOTE: If the computer has two solid-state drives installed, repeat the same steps for the second solid-state drive.

  • Page 56: Removing The M.2 2280 Pcie Solid-State Drive

    Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive connector. 2. Insert the solid-state drive at a 45-degree angle into the slot on the system board. NOTE: When replacing a M.2 2280 solid-state drive from a M.2 2230 solid-state drive, ensure to move the standoff nut to the M.2 2230 solid-state drive slot position.

  • Page 57: Installing The M.2 2280 Pcie Solid-State Drive

    Steps 1. Loosen the four captive screws that secures the M.2 heat-sink to the system board. 2. Lift and remove the M.2 heat-sink from the computer. 3. Remove the single (M2x3.5) screws that secures the solid-state drive to the system board. NOTE: If the computer has two solid-state drives installed, repeat the same steps for the second solid-state drive.

  • Page 58: Heat Sink

    Steps 1. Align the notch on the solid-state drive with the tab on the solid-state drive connector. 2. Insert the solid-state drive at a 45-degree angle into the slot on the system board. NOTE: When replacing a M.2 2280 solid-state drive to a M.2 2230 solid-state drive, ensure to move the standoff nut to the M.2 2230 solid-state drive slot position.

  • Page 59: Installing The Heat-Sink Assembly

    About this task The following images indicate the location of the heat-sink assembly and provide a visual representation of the removal procedure. Steps 1. Using a Torx T20 screwdriver, in reverse sequential order (4->3->2->1), loosen the four captive screws that secure the heat-sink assembly to the system board.

  • Page 60: Hard-Drive Fan Assembly

    Steps 1. Align the screws on the processor fan and heat-sink assembly with the screw holders on the system board and place the processor fan and heat-sink assembly on the processor. NOTE: Ensure that the triangle mark is directed towards the rear side of the computer. 2.

  • Page 61: Installing The Hard-Drive Fan Assembly

    Steps 1. Disconnect the SATA power-cable, thermal-sensor cable, PCIe cable and the fan-controller cable from the connectors on the system board. 2. Open the bottom-air shroud cover and remove the cables that are routed inside. 3. Remove the two (M3) screws from the hard-drive fan assembly. 4.
  • Page 62 Steps 1. Align the tabs on the hard-drive fan assembly with the slots on the chassis. 2. Place the hard-drive fan assembly into the slot in the chassis. 3. Install the two (M3) screws to secure the fan assembly to the chassis. 4.

  • Page 63: Processor

    Processor Removing the processor Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. 3. Remove the heat-sink assembly. NOTE: The processor might still be hot after the computer is shut down. Allow the processor to cool down before removing About this task The following images indicate the location of the processor and provide a visual representation of the removal procedure.

  • Page 64: Installing The Processor

    4. Gently slide the processor out of the guide rails on the CPU carrier. Installing the processor 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 processor and provides a visual representation of the installation procedure. Steps 1.

  • Page 65: Expansion Card

    Expansion card Removing the powered graphics-card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. 3. Remove the shroud. About this task The following images indicate the location of the powered graphics-card and provide a visual representation of the removal procedure.

  • Page 66: Installing The Powered Graphics-Card

    Steps 1. Disconnect the PCIe-power cable from the connector on the graphics card. 2. Remove the PCIe-power cables from the PCIe holder. 3. Push the PCIe latch to open the PCIe door. 4. Push the PCIe-holder latch upwards to release the PCIe-card bracket. 5.
  • Page 67 Steps 1. Align the powered GPU with the PCI-Express card connector on the system board. 2. Using the alignment post, connect the graphics card to the connector and press down firmly. Ensure that the graphics card is firmly seated. 3. Slide the release latch down on the PCIe-holder to secure the PCIe-card bracket. 4.

  • Page 68: Removing The Non-Powered Graphics Card

    Removing the non-powered graphics card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. 3. Remove the shroud. About this task The following images indicate the location of the non-powered graphics card and provide a visual representation of the removal procedure.

  • Page 69: Removing The Ultraspeed Duo Card

    Steps 1. Align the powered GPU with the PCI-Express card connector on the system board. 2. Using the alignment post, connect the graphics card to the connector and press down firmly. Ensure that the graphics card is firmly seated. 3. Close the PCIe door. Next steps 1.

  • Page 70: Installing The Ultraspeed Duo Card

    Steps 1. Push the PCIe latch to open the PCIe door. 2. Lift and remove the UltraSpeed Duo card away from the expansion-card slot. Installing the UltraSpeed Duo card 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 UltraSpeed Duo card and provide a visual representation of the installation procedure.

  • Page 71: Removing The Ultraspeed Quad Card

    Steps 1. Align the UltraSpeed Duo card with the expansion-card slot on the system board. 2. Using the alignment post, connect the UltraSpeed Duo card to the connector and press down firmly. Ensure that the UltraSpeed Duo card is firmly seated. 3.

  • Page 72: Removing The Thunderbolt 3 Pcie Card

    About this task The following images indicate the location of the UltraSpeed Quad card and provide a visual representation of the installation procedure. Steps 1. Align the UltraSpeed Quad card with the expansion-card slot on the system board. 2. Using the alignment post, connect the UltraSpeed Quad card to the connector and press down firmly. Ensure that the UltraSpeed Quad card is firmly seated.

  • Page 73: Installing The Thunderbolt 3 Pcie Card

    Steps 1. Disconnect the Thunderbolt 3 PCIe cable from the connector on the system. 2. Remove the Thunderbolt 3 PCIe cable from the routing guide on the chassis. 3. Push the PCIe latch to open the PCIe door. 4. Lift and remove the Thunderbolt 3 PCIe card away from the expansion-card slot. Installing the Thunderbolt 3 PCIe card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 74: Removing The Wireless Card

    Steps 1. Align the Thunderbolt 3 PCIe card with the expansion-card slot on the system board. 2. Using the alignment post, connect the Thunderbolt 3 PCIe card to the connector and press down firmly. Ensure that the Thunderbolt 3 PCIe card is firmly seated. 3.

  • Page 75: Installing The Wireless Card

    About this task The following images indicate the location of the wireless card and provide a visual representation of the removal procedure. Steps 1. Loosen the captive screw on the external-antenna cover. 2. Remove the external-antenna cover from over the antenna connectors on the PCIe-riser card. 3.

  • Page 76: Installing The Speaker

    About this task The following images indicate the location of the speaker and provide a visual representation of the removal procedure. Steps 1. Disconnect the speaker cable from the connector on the system board. 2. Remove the speaker cable from the front chassis. 3.

  • Page 77: Intrusion Switch

    Steps 1. Press the tabs on the speaker and slide the speaker in the slot on the chassis until it snaps into place. 2. Route the speaker cable through the routing guide on the chassis. 3. Route the speaker cable through the slot on the chassis. 4.

  • Page 78: Installing The Intrusion Switch

    Steps 1. Disconnect the intrusion-switch cable from the connector on the system board. 2. Remove the cable from the routing point on the system board. 3. Slide and remove the intrusion switch from the computer. Installing the intrusion switch Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 79: Internal Hard-Drive Cage

    Steps 1. Insert the intrusion switch into its slot in the chassis. 2. Route the intruder cable through the routing guides on the system board. 3. Connect the intrusion-switch cable to the connector on the system board. Next steps 1. Install the shroud.

  • Page 80: Installing The Internal Hard-Drive Cage

    Installing the internal hard-drive cage 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 internal hard-drive cage and provide a visual representation of the installation procedure.

  • Page 81: Installing The Voltage-Regulator Heat Sink - Location 1

    2. Remove the side cover. 3. remove the shroud. About this task The following image indicates the location of the voltage-regulator heat sink and provides a visual representation of the removal procedure. Steps 1. Remove the two (M3x5) screws that secure the voltage-regulator heat sink to the system board. 2.

  • Page 82: Removing The Voltage-Regulator Heat Sink - Location 2

    Steps 1. Align the screw holes on the voltage-regulator heat sink to the screw holes on the system board and adhere the voltage- regulator heat sink to the system board. 2. Install the two (M3x5) screws that secure the voltage-regulator heat sink to the system board. Next steps 1.

  • Page 83: Installing The Voltage-Regulator Heat Sink - Location 2

    Steps 1. Loosen the two captive screws that secure the voltage-regulator heat sink to the system board. 2. Lift the heat sink off the system board. Installing the voltage-regulator heat sink - Location 2 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 voltage-regulator heat sink and provides a visual representation of the installation procedure.

  • Page 84: Removing The Voltage-Regulator Heat Sink - Location 3

    Steps 1. Align the screw holes on the voltage-regulator heat sink to the screw holes on the system board and adhere the voltage- regulator heat sink to the system board. 2. Tighten the two captive screws that secure the voltage-regulator heat sink to the system board. Next steps 1.

  • Page 85: Installing The Voltage-Regulator Heat Sink - Location 3

    Installing the voltage-regulator heat sink - Location 3 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 voltage-regulator heat sink and provides a visual representation of the installation procedure.
  • Page 86 About this task The following images indicate the location of the power-supply unit and provide a visual representation of the removal procedure. Removing and installing components...
  • Page 87 Removing and installing components...

  • Page 88: Installing The Power-Supply Unit

    Steps 1. Lay the computer on the right side. 2. Disconnect the ATX CPU power-cables from the connectors on the system board. 3. Open the clips on the routing guides on the power-supply cover and remove the CPU ATX power-cables from the clips. 4.
  • Page 89 Removing and installing components...
  • Page 90 Removing and installing components...

  • Page 91: System Board

    Steps 1. Slide the power-supply unit into the chassis until the securing tab snaps into position. 2. Replace the four (#6x32) screws to secure the power-supply unit to the chassis. 3. Route the PCIe power-cables and SATA power-cables through the bottom-air shroud. 4.
  • Page 92 Table 2. Precision 7865 tower system board callouts Connector Description ATX CPU1 4-pin processor power connector ATX CPU2 4-pin processor power connector NVME1 NVMe connector for externally facing M.2 flexbay drive NVME0 NVMe connector for externally facing M.2 flexbay drive...

  • Page 93: Removing The System Board

    Removing the system board Prerequisites 1. Follow the procedure in Before working inside your computer. NOTE: Your computer’s Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board. NOTE: Replacing the system board removes any changes that you have made to the BIOS using the BIOS setup program.
  • Page 94 Removing and installing components...

  • Page 95: Installing The System Board

    Steps 1. Remove the (M3) screws that secure the supporting bracket to the system board. NOTE: One of the screws that secures the system board to the chassis is located under the VR heatsink. Remove the air shroud protector followed by the VR heatsink to access the screw. 2.
  • Page 96 Removing and installing components...
  • Page 97 Steps 1. Slide the front I/O-ports on the system board into the front I/O-slots on the chassis and align the screw holes on the system board with the screw holes on the chassis. 2. Replace the eleven (#6-32) screws that secure the system board to the chassis. 3.

  • Page 98: Rack Rails

    NOTE: Your computer’s Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board. NOTE: Replacing the system board removes any changes that you have made to the BIOS using the BIOS setup program.

  • Page 99: Chapter 3: Drivers And Downloads

    Drivers and downloads When troubleshooting, downloading or installing drivers it is recommended that you read the Dell Knowledge Based article, Drivers and Downloads FAQ 000123347. Drivers and downloads...

  • Page 100: Chapter 4: Bios Setup

    BIOS 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. NOTE: Depending on the computer and its installed devices, the items listed in this section may or may not be displayed. NOTE: Before you change BIOS Setup program, it is recommended that you write down the BIOS Setup program screen information for future reference.

  • Page 101: One Time Boot Menu

    The one-time boot menu displays the devices that you can boot from including the diagnostic option. The boot menu options are: ● Removable Drive (if available) ● STXXXX Drive (if available) NOTE: XXX denotes the SATA drive number. ● Optical Drive (if available) ●...
  • Page 102 Table 4. System setup options—System information menu (continued) Overview AC Adapter Displays whether the AC adapter is connected or not. Processor Information Processor Type Displays the processor type. Maximum Clock Speed Displays the maximum processor clock speed. Minimum Clock Speed Displays the minimum processor clock speed.
  • Page 103 Table 5. System setup options—Boot Configuration menu (continued) Boot Configuration By default, the Deployed Mode is enabled. Expert Key Management Enable Custom Mode Enable or disable custom mode. By default, the custom mode option is not enabled. Custom Mode Key Management Select the custom values for expert key management.
  • Page 104 Table 7. System setup options—Storage menu (continued) Storage Type Displays the M.2 PCIe SSD type information of the system. Device Displays the M.2 PCIe SSD device information of the system. Enable MediaCard Secure Digital (SD) Card Enable or disable the SD card. By default, the Secure Digital (SD) Card option is enabled.
  • Page 105 By default, the Enable USB Wake Support option is disabled. Wake on Dell USB-C Dock When enabled, connecting a Dell USB-C Dock will wake the system from Standby, Hibernate, and Power Off. By default, the Wake on Dell USB-C Dock option is enabled.
  • Page 106 Table 11. System setup options—Security menu (continued) Security SHA-256 When enabled, the BIOS and TPM will use the SHA-256 hash algorithm to extend measurements into the TPM PCRs during BIOS boot. By default, the SHA-256 option is enabled. Clear Enables to clear the TPM owner information and returns the TPM to the default state.
  • Page 107 Service operating system does not boot or is not installed. By default, the option is enabled. Dell Auto operating system Recovery Controls the automatic boot flow for SupportAssist System Resolution Console Threshold and for Dell operating system Recovery Tool. BIOS setup...
  • Page 108 Table 13. System setup options—Update, Recovery menu (continued) Update, Recovery By default, the threshold value is set to 2. Table 14. System setup options—System Management menu System Management Service Tag Displays the Service Tag of the system. Asset Tag Create a system Asset Tag. AC Behavior Wake on AC Enable or disable the wake on AC option.
  • Page 109 Table 17. System setup options—Virtualization menu (continued) Virtualization By default, the option is enabled. VT for Direct I/O When enabled, the system will be able to perform Virtualization Technology for Direct I/O (VT-d). By default, the option is enabled. Intel Trusted Execution Technology (TXT) Enable Intel Trusted Execution Specifies whether a measured Virtual Machine Monitor (MVMM) can use the...

  • Page 110: Updating The Bios

    7. After the download is complete, browse the folder where you saved the BIOS update file. 8. Double-click the BIOS update file icon and follow the on-screen instructions. For more information, search in the Knowledge Base Resource at www.dell.com/support. Updating the BIOS in Linux and Ubuntu...

  • Page 111: Updating The Bios Using The Usb Drive In Windows

    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 112: System And Setup Password

    Steps 1. From a turn off state, insert the USB drive where you copied the flash into a USB port of the computer. 2. Turn on the computer and press F12 to access the One-Time Boot Menu, select BIOS Update using the mouse or arrow keys then press Enter.

  • Page 113: Deleting Or Changing An Existing System Setup Password

    Clearing BIOS (System Setup) and System passwords About this task To clear the system or BIOS passwords, contact Dell technical support as described at www.dell.com/contactdell. NOTE: For information on how to reset Windows or application passwords, refer to the documentation accompanying Windows or your application.

  • Page 114: Chapter 5: Troubleshooting

    Check diagnostics About this task SupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The Dell SupportAssist Pre-boot System Performance Check diagnostics is embedded with the BIOS and is launched by the BIOS internally. The embedded system diagnostics provides a set of options for particular devices or device groups allowing you to: ●...
  • Page 115 (AC, battery, coin cell) and errors drain flea power by pressing and holding down power button for 3~5 seconds. CPU failure ● Run the Dell Support Assist/Dell Diagnostics tool. ● If problem persists, replace the system board. System board failure (included ●...
  • Page 116 3~5 seconds to ensure all power are drained. ● Run "BIOS recovery from USB", and the instructions are in the website Dell support. ● If problem persists, replace the system board. Timeout waiting on ME to Replace the system board.

  • Page 117: Recovering The Operating System

    It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its factory state. 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.
  • Page 118 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. Turn on the modem. 7.

  • Page 119: Chapter 6: 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 23. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com Tips Contact Support In Windows search, type Contact Support, and press Enter.

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