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Lenovo ThinkBook 14 Gen 4+ Hardware Maintenance Manual
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Lenovo ThinkBook 14 Gen 4+ Hardware Maintenance Manual

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Hardware Maintenance Manual
Lenovo ThinkBook 14 Gen 4+ and Lenovo ThinkBook 16 Gen 4+

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Summary of Contents for Lenovo ThinkBook 14 Gen 4+

  • Page 1 Hardware Maintenance Manual Lenovo ThinkBook 14 Gen 4+ and Lenovo ThinkBook 16 Gen 4+...
  • Page 2 First Edition (March 2022) © Copyright Lenovo 2022.

  • Page 3: Table Of Contents

    Trademarks ....lxxix Remove the heat sink... Remove the fans ... . © Copyright Lenovo 2022...
  • Page 4 Hardware Maintenance Manual...

  • Page 5: About This Manual

    Important: • This manual is intended only for trained service technicians who are familiar with Lenovo products. • Before servicing a Lenovo product, be sure to read all the information under Chapter 1 “Safety information” on page 1. © Copyright Lenovo 2022...
  • Page 6 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    • Do not work alone under hazardous conditions or near equipment that has hazardous voltages. • Disconnect all power before: – Performing a mechanical inspection – Working near power supplies © Copyright Lenovo 2022...

  • Page 8: Safety Inspection Guide

    This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-Lenovo features or options not covered by this inspection guide.

  • Page 9: Handling Devices That Are Sensitive To Electrostatic Discharge

    4. Check for cracked or bulging batteries. 5. Remove the cover. 6. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo alterations. 7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.

  • Page 10: Grounding Requirements

    Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician. Safety notices (multilingual translations) The safety notices in this section are provided in the following languages: •...
  • Page 11 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO PERIGO Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER DANGER DANGER DANGER VORSICHT Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 VORSICHT VORSICHT VORSICHT Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 Hardware Maintenance Manual...
  • Page 21 Chapter 1 Safety information...
  • Page 22 Hardware Maintenance Manual...
  • Page 23 Chapter 1 Safety information...
  • Page 24 Hardware Maintenance Manual...
  • Page 25 Chapter 1 Safety information...
  • Page 26 Hardware Maintenance Manual...

  • Page 27: Chapter 2. General Checkout

    • Scratched (cosmetic) parts • Distortion, deformation, or discoloration of the cosmetic parts • Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force • Damage caused by liquid spilled into the system © Copyright Lenovo 2022...

  • Page 28: Cru List

    • Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card • Improper disc insertion or use of an external optical drive • Fuses blown by attachment of a non-supported device •...

  • Page 29: Chapter 3. Identifying Frus (Crus)

    Chapter 3. Identifying FRUs (CRUs) Locate FRUs and CRUs The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to replace when servicing a customer’s computer. © Copyright Lenovo 2022...
  • Page 30 Figure 1. 14-inch models - Exploded view Hardware Maintenance Manual...
  • Page 31 Table 2. FRU (CRU) categories FRU (CRU) category Upper case Thermal module mylar Heat sink Fans 2280 Solid-state drive (SSD) 2242 Solid-state drive (SSD) Solid-state drive (SSD) bracket Note: The SSD bracket is used to lock the screw for the 2242 SSD. System board Battery pack Touchpad golden mylar...
  • Page 32 Figure 2. 14-inch models - LCD module - exploded view Hardware Maintenance Manual...
  • Page 33 Table 3. FRU categories for the LCD module FRU (CRU) category LCD panel LCD bezel Camera board Microphone rubbers Hinges Hinge cover LCD cover Removable tape EDP cable Chapter 3 Identifying FRUs (CRUs)
  • Page 34 Figure 3. 16-inch models - Exploded view Hardware Maintenance Manual...
  • Page 35 Table 4. FRU (CRU) categories FRU (CRU) category Upper case Thermal module mylar Heat sink Fans 2280 Solid-state drive (SSD) 2242 Solid-state drive (SSD) Solid-state drive (SSD) bracket Note: The SSD bracket is used to lock the screw for the 2242 SSD. System board Battery pack Touchpad golden mylar...
  • Page 36 Figure 4. 16-inch models - LCD module - exploded view Table 5. FRU categories for the LCD module FRU (CRU) category LCD panel LCD bezel Camera board Microphone rubbers Hinges Hardware Maintenance Manual...
  • Page 37 Table 5. FRU categories for the LCD module (continued) Hinge cover LCD cover Removable tape EDP cable Chapter 3 Identifying FRUs (CRUs)
  • Page 38 Hardware Maintenance Manual...

  • Page 39: Chapter 4. Removing A Fru Or Cru

    Chapter 4. Removing a FRU or CRU Service tools The following table lists tools for servicing Lenovo computers. Tools with a cross mark are needed for serving the product models as described by this publication. Prepare them before you service the product.

  • Page 40: Removal Procedure For 14-Inch Models

    3. Follow the correct sequence in the steps for removing an FRU, as shown in the illustrations by the numbers in square callouts. 4. When removing an FRU, move it in the direction as shown by the arrow in the illustration. 5.

  • Page 41: Remove The Battery Pack

    Screw specifications Number of screws M2.0 x L8 M2.0 x L3.5 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Lower case Remove the battery pack Make sure the following FRU (or CRU) has been removed.

  • Page 42: Remove The Solid-State Drive (Ssd) And Solid-State Drive (Ssd) Bracket

    Figure 6. Remove six screws and remove the battery pack Screw specifications Number of screws M2.0 x L4 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Battery pack Remove the solid-state drive (SSD) and solid-state drive (SSD) bracket Make sure the following FRU (or CRU) has been removed.

  • Page 43: Remove The Wi-Fi Card

    Figure 10. Remove the SSD and SSD bracket Screw specifications Number of screws M1.6 x L1.8 Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Solid-state drive (SSD) Solid-state drive (SSD) bracket Remove the Wi-Fi card Make sure the following FRU (or CRU) has been removed.

  • Page 44: Remove The Speakers

    Figure 11. Remove the Wi-Fi card Screw specifications Number of screws M1.6 x L1.8 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Wi-Fi card Remove the speakers Make sure the following FRU (CRU) has been removed.

  • Page 45: Remove The Heat Sink

    Figure 14. Remove the heat sink Screw specifications Number of screws M2.0 x L4 Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: Heat sink Thermal module mylar Chapter 4 Removing a FRU or CRU...

  • Page 46: Remove The Fans

    Disconnect the fan cables from the system board. Remove four screws and then remove the fans. Figure 16. Remove the fans Screw specifications Number of screws M2.0 x L4 Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: Fans Hardware Maintenance Manual...

  • Page 47: Remove The I/O Board And The Cmos Battery

    Thermal module mylar Remove the I/O board and the CMOS battery Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 34 “Remove the solid-state drive (SSD) and solid-state drive (SSD) bracket” on page 36 Step 1.

  • Page 48: Remove The Fingerprint Board Cable

    Disconnect the CMOS battery from the I/O board and then remove the CMOS battery. Figure 20. Remove the CMOS battery Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: I/O board CMOS battery Remove the fingerprint board cable Make sure the following FRUs (or CRUs) have been removed.

  • Page 49: Remove The Touchpad Cable

    Figure 21. Remove the fingerprint board cable Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Fingerprint board cable Remove the touchpad cable Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 34 “Remove the battery pack”...

  • Page 50: Remove The System Board And The I/O Board Cable

    Disconnect the touchpad cable from the system board and the touchpad. Remove the touchpad cable. Figure 24. Remove the touchpad cable Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: Touchpad cable Touchpad golden mylar Remove the system board and the I/O board cable Make sure the following FRUs (or CRUs) have been removed.
  • Page 51 Figure 25. Disconnect cables connected to the system board Step 2. Remove three screws and then open the hinge. Figure 26. Remove three screws and open the hinge Screw specifications Number of screws M2.5 x L5 Step 3. Remove five screws and then remove the system board with the I/O board cable. Chapter 4 Removing a FRU or CRU...
  • Page 52 Separate the I/O board cable from the system board. Figure 29. Separate the I/O board cable from the system board Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: System board I/O board cable...

  • Page 53: Remove The Lcd Module

    The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb drive. Go to http://support.lenovo.com/us/en/solutions/HT506954 for detailed instructions on how to create and use a Golden Key U1 tool. Remove the LCD module Make sure the following FRU (CRU) has been removed.

  • Page 54: Remove The Upper Case

    “Remove the touchpad cable” on page 43 “Remove the system board and the I/O board cable” on page 44 “Remove the LCD module” on page 47 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Upper case Disassemble the LCD module The LCD module as a whole is not an FRU.
  • Page 55 “Remove the LCD module” on page 47 Step 1. Remove the hinge cover. Figure 33. Remove the hinge cover Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Hinge cover Remove the LCD bezel Make sure the following FRUs (or CRUs) have been removed.
  • Page 56 Figure 35. Remove the hinges Screw specifications Number of screws M2.0 x L2 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Hinges Remove the LCD panel Make sure the following FRUs (CRUs) have been removed.
  • Page 57 Turn over the LCD panel. Peel off the tape and then disconnect the EDP cable from the LCD panel. Remove the LCD panel. Figure 37. Remove the LCD panel Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: LCD panel Removable tape LCD Self Test When you turn on the computer and the LCD goes black, run LCD Self Test to help you determine whether the LCD functions normally.
  • Page 58 “Remove the LCD panel” on page 50 Step 1. Remove the microphone rubbers. Figure 38. Remove the microphone rubbers Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Microphone rubbers Removable tape Remove the EDP cable Make sure the following FRUs (CRUs) have been removed.
  • Page 59 Figure 39. Remove the EDP cable Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: EDP cable Removable tape Remove the camera board Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 47 “Remove the hinge cover”...

  • Page 60: Removal Procedure For 16-Inch Models

    “Remove the EDP cable” on page 52 “Remove the camera board” on page 53 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: LCD cover Removal procedure for 16-inch models Remove the lower case Make sure the computer has been shut down before servicing the computer.

  • Page 61: Remove The Battery Pack

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Lower case Remove the battery pack Make sure the following FRU (or CRU) has been removed. “Remove the lower case” on page 54 Step 1.
  • Page 62 Figure 45. Remove the SSD and SSD bracket Screw specifications Number of screws M1.6 x L1.8 Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: Solid-state drive (SSD) Solid-state drive (SSD) bracket Hardware Maintenance Manual...

  • Page 63: Remove The Wi-Fi Card

    Figure 46. Remove the Wi-Fi card Number of screws Screw specifications M1.6 x L1.8 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Wi-Fi card Remove the speakers Make sure the following FRU (CRU) has been removed.

  • Page 64: Remove The Heat Sink

    Figure 47. Remove the speakers Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Speakers Remove the heat sink Make sure the following FRU (or CRU) has been removed. “Remove the lower case” on page 54 Step 1.

  • Page 65: Remove The Fans

    Figure 49. Remove the heat sink Screw specifications Number of screws M2.0 x L4 Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Heat sink Thermal module mylar Remove the fans Make sure the following FRU (or CRU) has been removed.

  • Page 66: Remove The I/O Board And The Cmos Battery

    Figure 51. Remove the fans Screw specifications Number of screws M2.0 x L4 Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Fans Thermal module mylar Remove the I/O board and the CMOS battery Make sure the following FRUs (or CRUs) have been removed.
  • Page 67 Figure 52. Remove three screws and then open the hinge Screw specifications Number of screws M2.5 x L5 Step 2. Disconnect the I/O board cable and fingerprint board cable from the I/O board. Figure 53. Disconnect the I/O board cable and fingerprint board cable from the I/O board Step 3.

  • Page 68: Remove The Fingerprint Board Cable

    Step 4. Disconnect the CMOS battery from the I/O board and then remove the CMOS battery. Figure 55. Remove the CMOS battery Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: I/O board CMOS battery Remove the fingerprint board cable Make sure the following FRUs (or CRUs) have been removed.

  • Page 69: Remove The Touchpad Cable

    Figure 56. Remove the fingerprint board cable Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Fingerprint board cable Remove the touchpad cable Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 54 “Remove the battery pack”...

  • Page 70: Remove The System Board And The I/O Board Cable

    Disconnect the touchpad cable from the system board and the touchpad. Remove the touchpad cable. Figure 59. Remove the touchpad cable Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Touchpad cable Touchpad golden mylar Remove the system board and the I/O board cable Make sure the following FRUs (or CRUs) have been removed.
  • Page 71 Figure 60. Disconnect cables connected to the system board Step 2. Remove three screws and then open the hinge. Figure 61. Remove three screws and open the hinge Screw specifications Number of screws M2.5 x L5 Step 3. Remove seven screws and then remove the system board with the I/O board cable. Chapter 4 Removing a FRU or CRU...
  • Page 72 Step 5. Separate the I/O board cable from the system board. Figure 64. Separate the I/O board cable from the system board Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: System board I/O board cable...

  • Page 73: Remove The Lcd Module

    The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb drive. Go to http://support.lenovo.com/us/en/solutions/HT506954 for detailed instructions on how to create and use a Golden Key U1 tool. Remove the LCD module Make sure the following FRU (CRU) has been removed.

  • Page 74: Remove The Upper Case

    “Remove the system board and the I/O board cable” on page 64 “Remove the LCD module” on page 67 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Upper case Disassemble the LCD module The LCD module as a whole is not an FRU.

  • Page 75: Make Sure The Following Frus (Crus) Have Been Removed

    “Remove the LCD module” on page 67 Step 1. Remove the hinge cover. Figure 67. Remove the hinge cover Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Hinge cover Remove the LCD bezel Make sure the following FRUs (or CRUs) have been removed.

  • Page 76: Remove The Lcd Panel

    Screw specifications Number of screws M2.0 x L2 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Hinges Remove the LCD panel Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 67 “Remove the hinge cover”...

  • Page 77: Replacement Parts

    Turn over the LCD panel. Peel off the tape and then disconnect the EDP cable from the LCD panel. Remove the LCD panel. Figure 71. Remove the LCD panel Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: LCD panel Removable tape LCD Self Test When you turn on the computer and the LCD goes black, run LCD Self Test to help you determine whether the LCD functions normally.
  • Page 78 “Remove the LCD panel” on page 70 Step 1. Remove the microphone rubbers. Figure 72. Remove the microphone rubbers Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Microphone rubbers Removable tape Remove the EDP cable Make sure the following FRUs (CRUs) have been removed.
  • Page 79 Figure 73. Remove the EDP cable Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: EDP cable Removable tape Remove the camera board Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 67 “Remove the hinge cover”...
  • Page 80 “Remove the microphone rubbers” on page 72 “Remove the EDP cable” on page 72 “Remove the camera board” on page 73 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: LCD cover Hardware Maintenance Manual...

  • Page 81: Appendix A. Label Locations

    8 mm x 8 mm KCC label 43 mm x 24 mm Vietnam MEPS label 10 mm x 9 mm Belarus label 40 mm x 8 mm Lenovo energy saving label 30 mm x 30 mm © Copyright Lenovo 2022...
  • Page 82 Table 7. All base cover labels (continued) TW vision warning label 70 mm x 10 mm Adapter label 65 mm x 20 mm USA/CA/TW/CA_group label 32 mm x 10 mm Argentina label 68 mm x 6 mm New argentina label 68 mm x 6 mm South Africa label 20 mm x 10 mm...
  • Page 83 KCC label 10 mm x 9 mm Vietnam MEPS label Belarus label 40 mm x 8 mm Lenovo energy saving label 30 mm x 30 mm TW vision warning label 70 mm x 10 mm Adapter label 65 mm x 20 mm...
  • Page 84 Hardware Maintenance Manual...

  • Page 85: Trademarks

    Trademarks LENOVO and the LENOVO logo are trademarks of Lenovo. All other trademarks are the property of their respective owners. © 2022 Lenovo.

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