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Dell ChengMing 3901 Tower Service Manual
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Dell ChengMing 3901 Tower Service Manual

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ChengMing 3901 Tower
Service Manual
Regulatory Model: D32M
Regulatory Type: D32M002
April 2022
Rev. A01

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Summary of Contents for Dell ChengMing 3901 Tower

  • Page 1 ChengMing 3901 Tower Service Manual Regulatory Model: D32M Regulatory Type: D32M002 April 2022 Rev. A01...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2021-2022 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..........................9 BitLocker..................................9 Chapter 2: Removing and installing components................10 Recommended tools................................10 Screw list..................................... 10 Major components of ChengMing 3901 Tower ......................11 Cover.....................................12 Removing the side cover............................12 Installing the side cover.............................. 13 Front Bezel..................................15 Removing the front bezel............................15...
  • Page 4 Removing the slim-ODD bracket..........................36 Installing the slim-ODD bracket..........................37 Fan shroud..................................38 Removing the fan duct...............................38 Installing the fan duct..............................38 Speaker....................................39 Removing the intrusion speaker..........................39 Installing the intrusion speaker..........................40 Expansion card..................................41 Removing the expansion card........................... 41 Installing the expansion card.............................43 Power button..................................
  • Page 5 Chapter 5: Troubleshooting......................78 Dell SupportAssist Pre-boot System Performance Check diagnostics..............78 Running the SupportAssist Pre-Boot System Performance Check..............78 Power-Supply Unit Built-in Self-Test ..........................78 System diagnostic lights..............................78 Recovering the operating system..........................79 Real Time Clock—RTC reset............................80 Backup media and recovery options..........................80 WiFi power cycle................................

  • Page 6: 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 7: 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 8: Esd Field Service Kit

    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 9: Transporting Sensitive Components

    Transporting sensitive components When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport. Lifting equipment Adhere to the following guidelines when lifting heavy weight equipment: CAUTION: Do not lift greater than 50 pounds.

  • Page 10: 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 11: Major Components Of Chengming 3901 Tower

    Screw image System board 6-32 M2x4 Major components of ChengMing 3901 Tower The following image shows the major components of ChengMing 3901 Tower . 1. Side cover 2. Battery 3. Optical disk drive 4. Heat sink and fan assembly 5. Processor 6.

  • Page 12: Cover

    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. Cover Removing the side cover Prerequisites 1.

  • Page 13: Installing The Side Cover

    Steps 1. Loosen the two thumbscrews (6x32) that secures the side cover to the system. 2. Slide and lift the side 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. About this task The following image indicates the location of the side cover and provides a visual representation of the installation procedure.
  • Page 14 Steps 1. Align the side cover with the guide lines on the chassis. 2. Slide the side cover towards the front of the system to install it. 3. Tighten the two (6x32) thumbscrews to secure the side cover to the chassis. Next steps 1.

  • Page 15: 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 16: Memory Modules

    About this task The following image indicates the location of the front bezel and provides a visual representation of the installation procedure. Steps 1. Align the tabs with the slots on the chassis. 2. Press the bezel until the release tabs click into place. Next steps 1.

  • Page 17: Installing The Memory Module

    Steps 1. Pry the retention clips securing the memory module until the memory module pops-up. 2. Remove the memory module from the memory-module slot. NOTE: Repeat steps 1 and 2 to remove any other memory module installed in your computer. Installing the memory module Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 18: M.2 Ssd Card

    Steps 1. Align the notch on the memory module with the tab on the memory-module slot. 2. Insert the memory module into the memory-module connector and press the memory module down until it clicks into place.. NOTE: The securing clips return to the locked position. If you do not hear the click, remove the memory module and reinstall it.

  • Page 19: Installing The M.2 2230 Solid-State Drive

    ● M.2 2230 solid-state drive ● M.2 2280 solid-state drive The following images indicate the location of the M.2 2230 solid-state drive and provide a visual representation of the removal procedure. Steps 1. Remove the screw (M2x3.5) that secures the solid-state drive to the system board. 2.

  • Page 20: Removing The M.2 2280 Solid-State Drive

    Steps 1. Align the notch on the solid-state drive with the tab on the M.2 card slot and slide the solid-state drive into the M.2 card slot on the system board. 2. Replace the screw (M2x3.5) that secures the solid-state drive to the system board. Next steps 1.

  • Page 21: Installing The M.2 2280 Solid-State Drive

    Steps 1. Remove the screw (M2x3.5) that secures the solid-state drive to the system board. 2. Slide and remove the solid-state drive from the M.2 card 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. NOTE: The M.2 card installed on your computer will depend on the configuration ordered.

  • Page 22: Coin-Cell Battery

    Steps 1. Align the notch on the solid-state drive with the tab on the M.2 card slot and slide the solid-state drive into the M.2 card slot on the system board. 2. Replace the screw (M2x3.5) that secures the solid-state drive to the system board. Next steps 1.

  • Page 23: Installing The Coin-Cell Battery

    Steps Pry and remove the coin-cell battery from the system board. Installing the coin-cell battery Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the coin-cell battery and provides a visual representation of the installation procedure.

  • Page 24: Wlan Module

    Insert the coin-cell battery into the socket and press down the coin-cell battery in the socket. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer. WLAN module Removing the wireless card Prerequisites 1.

  • Page 25: Installing The Wireless Card

    Steps 1. Remove the screw (M2x3.5) that secures the wireless-card bracket to the wireless card and system board. 2. Remove the wireless-card bracket from the wireless card. 3. Disconnect the antenna cables from the wireless card. 4. Slide and remove the wireless card from the wireless-card slot. Installing the wireless card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 26: Power Supply Unit

    Table 2. Antenna-cable color scheme Connectors on the Antenna-cable color Silkscreen marking wireless card △ (white triangle) Main White MAIN Auxiliary Black ▲ (black triangle) 2. Align the notch on the wireless card with the tab on the wireless-card slot on the system board. 3.

  • Page 27: Installing The Power-Supply Unit

    Steps 1. Lay the computer on the right side. 2. Disconnect the power cables from the system board and unroute them from the routing guides on the chassis. 3. Remove the three (#6-32) screws that secure the power-supply unit to the chassis. 4.
  • Page 28 About this task The following image indicates the location of the power-supply unit and provides a visual representation of the installation procedure. Steps 1. Slide the power-supply unit into the chassis until the securing tab snaps into position. 2. Replace the three (#6-32) screws to secure the power-supply unit to the chassis. 3.

  • Page 29: Hard Drive

    Hard drive 2.5 inch hard drive Removing the 2.5-inch hard drive 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 2.5-inch hard drive and provide a visual representation of the removal procedure.
  • Page 30 4. Remove the 2.5 in. hard-drive assembly. About this task The following images indicate the location of the hard-drive bracket and provide a visual representation of the removal procedure. NOTE: ChengMing 3901 Tower supports two 2.5-inch hard drives. Removing and installing components...
  • Page 31 Steps 1. Loosen the two (M3x3.5) screws from the first 2.5 inch hard-drive. 2. Lift and slide the hard drive out of the bracket. 3. Loosen the two (M3x3.5) screws from the second 2.5 inch hard-drive (if installed in your computer). 4.
  • Page 32 4. Place the first 2.5 inch hard-drive into the bracket. 5. Align and replace the two (M3x3.5) screws insert the pins on the drive bracket with the slots on the drive [4]. Next steps Next steps 1. Install the 2.5 in. hard-drive assembly.

  • Page 33: 3.5 Inch Hard Drive

    Steps 1. Locate the hard-drive carrier to install the hard drive. 2. Place the hard drive into the hard-drive carrier and align the tabs on the carrier with the slots on the hard drive. 3. Snap the hard-drive carrier into the hard drive. 4.
  • Page 34 3. Remove the four (6-32) screws that secure the hard-disk drive to the chassis.. 4. Lift the hard drive off the hard-drive carrier. NOTE: Note the orientation of the hard drive so that you can replace it correctly. Installing the 3.5-inch hard drive Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 35: Optical Drive

    Optical drive Removing the optical drive 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 optical drive and provide a visual representation of the removal procedure. Steps 1.

  • Page 36: Slim Optical-Drive Bracket

    Steps 1. Insert the ODD into the ODD slot. 2. Connect the data and power cables to the optical drive. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer. Slim optical-drive bracket Removing the slim-ODD bracket Prerequisites 1.

  • Page 37: Installing The Slim-Odd Bracket

    Steps 1. Pry the slim-ODD bracket to release it from the slot on the ODD. 2. Remove the slim-ODD bracket off the ODD. Installing the slim-ODD bracket 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 slim-ODD bracket and provide a visual representation of the installation procedure.

  • Page 38: Fan Shroud

    Fan shroud Removing the fan duct 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 fan duct and provide a visual representation of the removal procedure. Steps 1.

  • Page 39: Speaker

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

  • Page 40: Installing The Intrusion Speaker

    Steps 1. Locate the intrusion speaker on your computer. 2. Disconnect the speaker cable from the system board and release it from the routing guides on middle frame. 3. Press the securing tab on the speaker and lift the intrusion speaker along with the cable off the chassis. Installing the intrusion speaker Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 41: Expansion Card

    Steps 1. Slide the intrusion speaker module into the slot on the chassis. 2. Connect the intrusion speaker cable to the system board. 3. Route the cable through the routing guides on middle frame and connect the intrusion speaker cable to the system board. Next steps 1.
  • Page 42 Steps 1. Pull the metal card-retention latch from the computer. 2. Push the release tab and lift the expansion card from the system board. Removing and installing components...

  • Page 43: Installing The Expansion Card

    Installing the expansion card About this task Steps 1. Insert the expansion card in the connector on the system board and press down until it is secured. 2. Push the PCI bracket back to its position. 3. Pull and close PCI bracket metal card-retention latch to the computer. Next steps 1.

  • Page 44: Power Button

    Power button Removing the power button Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the side cover. 3. Remove the duct. 4. Remove the front bezel. About this task The following images indicate the location of the power button and provide a visual representation of the removal procedure. Steps 1.

  • Page 45: Intrusion Switch

    Steps 1. Insert the power-button cable into the slot from the front-side of the computer, and press the power-button head until it clicks into the place in the chassis. 2. Align and connect the power-button cable to the connector on the system board. Next steps 1.

  • Page 46: Installing The Intrusion Switch

    Steps 1. Disconnect the intruder cable from the connector on the system board. 2. Slide and remove the intrusion switch from the chassis. Installing the intrusion switch 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 intrusion switch and provides a visual representation of the installation procedure.

  • Page 47: Heat Sink And Fan Assembly

    Steps 1. Insert the intrusion switch into its slot and slide the switch to secure it into the slot. 2. Connect the intruder cable to the connector on the system board. Next steps 1. Install the side cover. 2. Follow the procedure in After working inside your computer.

  • Page 48: Installing The Heat Sink And Fan Assembly

    Steps 1. Disconnect the cable from the connector on the system board. 2. In reverse sequential order (4>3>2>1), loosen the four captive screws that secure the heat sink to the system board. 3. Lift the heat sink assembly away from the system board . Installing the heat sink and fan assembly Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.

  • Page 49: Processor

    Steps 1. Place the heat sink and fan assembly on the system board. 2. Align the screw holes on the heat sink to the screw holes on the system board. 3. In sequential order (1>2>3>4), tighten the four captive screws that secure the heat sink and fan assembly to the system board.

  • Page 50: Installing The Processor

    Steps 1. Press down and push the release lever away from the processor to release it from the securing tab. 2. Lift the lever upward to lift the processor cover. CAUTION: When removing the processor, do not touch any of the pins inside the socket or allow any objects to fall on the pins in the socket.

  • Page 51: System Board

    Steps 1. Ensure that the release lever is fully extended in the open position. CAUTION: You must place the processor correctly in the processor socket to avoid damage to the processor. 2. Align the pin-1 corner of the processor with the pin-1 corner of the processor socket, and then place the processor in the processor socket.

  • Page 52: Removing The System Board

    7. SATA connector (white) 8. SATA power cable connector 9. SATA1 connector 10. M.2 WLAN connector 11. SATA0 connector (blue) 12. M.2 PCIe SSD connector 13. PCI 14. PCIe x16 15. PCIe x1 16. Processor socket Removing the system board Prerequisites 1.
  • Page 53 Removing and installing components...
  • Page 54 Removing and installing components...
  • Page 55 Steps 1. Lay the chassis on the right side. 2. Remove the single (#6-32) screw that secures the side metal bracket to the chassis. 3. Remove the side metal bracket away from the chassis. 4. Disconnect the cables from their connectors on the system board. Removing and installing components...

  • Page 56: Installing The System Board

    5. Unroute the SATA cables from the cable routing guide on the metal bracket. 6. Remove the eight (#6-32) screws and single (M2x4) screw that secures the system-board to the chassis. 7. Slide the system board and lift the system-board assembly at an angle out of the chassis. Installing the system board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 57 Removing and installing components...
  • Page 58 Removing and installing components...
  • Page 59 Steps 1. Slide and insert the system board at an angle as shown in the image to make the type C toe-in to the hinge saddle. 2. Replace the eight (#6-32) screws and single (M2x4) screw to secure the system-board to the chassis. 3.

  • Page 60: Vga Port Cover

    NOTE: Replacing the system board removes any changes you have made to the BIOS using the BIOS setup program. You must make the appropriate changes again after you replace the system board. VGA port cover Removing the VGA port cover Prerequisites 1.
  • Page 61 Steps 1. Place the VGA port cover on the VGA port and align the screw holes. 2. Replace the two screws to secure the VGA port cover to the chassis. Next steps 1. Follow the procedure in After working inside your computer.

  • Page 62: 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 63: 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 64: One Time Boot Menu

    NOTE: Depending on this computer and its installed devices, the items listed in this section may or may not appear. Table 4. System setup options—System information menu Overview ChengMing 3901 Tower BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer.
  • Page 65 Table 4. System setup options—System information menu (continued) Overview Memory Available Displays the total computer memory available. Memory Speed Displays the memory speed. Memory Channel Mode Displays single or dual channel mode. Memory Technology Displays the technology used for the memory. DIMM 1 Size Displays the DIMM 1 memory size.
  • Page 66 Table 5. System setup options—Boot Configuration menu (continued) Boot Configuration NOTE: If Custom Mode is not enabled, any changes made with respect to the keys will not be saved. Custom Mode Key Management Allows for selection of key database. ● Save to File will save the key to a user-selected file. ●...
  • Page 67 Table 6. System setup options—Integrated Devices menu (continued) Integrated Devices Rear USB Configuration Enables or disables individual USB ports. By default, Rear Port 1 (Top Left)* is selected. By default, Rear Port 2 (Top Right)* is selected. By default, Rear Port 3 (Bottom Left) is selected. By default, Rear Port 5 (Bottom Right) is selected.
  • Page 68 Table 9. System setup options—Connection menu Connection Network Controller Configuration Integrated NIC Controls the onboard LAN controller. By default, Enable with PXE is selected. Wireless Device Enable WLAN Enables or disables the internal WLAN device. Default: ON Bluetooth® Enables or disables the internal Bluetooth® device. Default: ON Enable UEFI Network Stack Enable UEFI Network Stack...
  • Page 69 Table 10. System setup options—Power menu (continued) Power Intel Speed Shift Technology Intel Speed Shift Technology Enables or disables the Intel Speed Shift Technology support. Turning on this option allows the operating system to select the appropriate processor performance automatically. Default: ON Table 11.
  • Page 70 Table 11. System setup options—Security menu (continued) Security UEFI Capsule Firmware Updates Enable or disable BIOS updates through UEFI capsule update packages. PTT Security PTT On Enable or disable Platform Trust Technology (PTT) visibility to the operating system. Clear Default: Disabled PPI ByPass for Clear Commands Enable or disable the TPM Physical Presence Interface (PPI).
  • Page 71 Enables or disables cloud Service OS recovery if the main OS fails to boot within the number of failures equal or greater than the value specified by Dell Auto OS Recovery Threshold, and local Service does not boot, or is not installed.
  • Page 72 Table 14. System setup options—System Management menu (continued) System Management 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. Wake on LAN/WLAN Wake on LAN/WLAN Enables the computer to be powered on by special LAN signals.
  • Page 73 Table 17. System setup options—Virtualization menu Virtualization Intel Virtualization Technology Enable Intel Virtualization Technology Enables the computer to run a virtual machine monitor (VMM). (VT) Default: ON VT for Direct I/O Enable Intel VT for Direct I/O Enables the computer to perform Virtualization Technology for Direct I/O (VT- d).

  • Page 74: Updating The Bios

    Updating the BIOS in Windows to download the latest BIOS setup program file. 2. Create a bootable USB drive. For more information, search in the Knowledge Base Resource at www.dell.com/support. 3. Copy the BIOS setup program file to the bootable USB drive.

  • Page 75: Updating The Bios From The F12 One-Time Boot Menu

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

  • Page 76: Assigning A System Setup Password

    CAUTION: The password features provide a basic level of security for the data on your computer. CAUTION: Anyone can access the data that is stored on your computer if it is not locked and left unattended. NOTE: System and setup password feature is disabled. Assigning a system setup password Prerequisites You can assign a new System or Admin Password only when the status is in Not Set.

  • Page 77: Clearing Cmos Settings

    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 78: 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 79: 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 80: Real Time Clock-Rtc Reset

    Real Time Clock—RTC reset The Real Time Clock (RTC) reset function allows you or the service technician to recover the recently launched model Dell Latitude and Precision systems from No POST/No Boot/No Power situations. You can initiate the RTC reset on the system from a power-off state only if it is connected to AC power.

  • Page 81: 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 22. Self-help resources Self-help resources Resource location Information about Dell products and services www.dell.com My Dell app...

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