Lenovo 21LL Manuals

Manuals and User Guides for Lenovo 21LL. We have 1 Lenovo 21LL manual available for free PDF download: Hardware Maintenance Manual

Lenovo 21LL Hardware Maintenance Manual

Lenovo 21LL Hardware Maintenance Manual (96 pages)

Brand: Lenovo | Category: Laptop | Size: 29.93 MB

Table of Contents

Table of Contents
3
About this Manual

5
Chapter 1. Safety Information

7
Chapter 2. Important Service Information

25
- Strategy for Replacing Frus
  25
  - Strategy for Replacing a Solid-State Drive
    25
  - How to Use Error Message
    26
- Strategy for Replacing Frus for CTO, Special-Bid, and Standard Models
  26
  - Product Definition
    26
  - FRU Identification
    26
Chapter 3. General Checkout

27
- What to Do First
  27
- Checkout Guide
  28
  - Diagnosing Problems
    28
  - Quick Test Programs
    29
  - UEFI Diagnostic Program
    29
  - Bootable Diagnostic Programs
    29
- Power System Checkout
  30
  - Checking the Ac Power Adapter
    31
  - Checking the Built-In Battery and Operational Charging
    31
Chapter 4. Related Service Information

33
- Reset or Restore Windows
  33
  - Use Lenovo Recovery Options
    33
  - Use Window Recovery Options
    33
- Passwords
  33
  - Power-On Password
    34
  - Nvme Passwords
    34
  - Supervisor Password
    34
  - System Management Password
    34
  - How to Remove the Power-On Password
    35
  - How to Remove the Nvme Password
    35
  - How to Remove the System Management Password
    36
- Power Management
  36
  - Sleep Mode
    36
  - Hibernation Mode
    37
- Symptom-To-FRU Index
  37
  - Numeric Error Codes
    38
  - Error Messages
    39
  - Battery-Charge LED Indicator Diagnosis
    39
  - Beep Symptoms
    41
  - LCD-Related Symptoms
    42
  - Intermittent Problems
    43
  - Undetermined Problems
    43
Chapter 5. Use the Keyboard Shortcuts

45
Chapter 6. Locations

47
- Locating Computer Controls and Connectors
  47
  - Overview
    47
- Locating Frus and Crus
  50
  - Major Frus and Crus
    51
  - Miscellaneous Parts
    53
  - Connector and Cable Guide
    53
- Looking up FRU Information
  55
Chapter 7. FRU Replacement Notices

57
- Service Tool Kit
  57
- Screw Notices
  57
- Retaining Serial Numbers
  58
Chapter 8. Removing or Replacing a FRU

61
- General Guidelines
  61
- Before Servicing the Computer
  61
  - Disabling the Built-In Battery
    61
  - Removing the Nano-SIM Card and Nano-SIM-Card Tray
    62
- LCD Module
  62
- Built-In Battery
  66
- Kickstand
  67
- Hinges
  69
- LCD Cable
  71
- Pogo Pin Cable
  72
- Volume Board and Cable
  73
- Hook Holder for Bezel
  74
- Security-Lock Bracket
  75
- USB-C Board Bracket
  75
- USB-C Board and Cable
  76
- Thermal Fan Assembly
  77
- M.2 Solid-State Drive
  79
- Speaker Assembly
  80
- Wireless WAN Card (for Selected Models)
  81
- Power Board and Cable
  82
- I/O Bracket
  84
- NFC Module, NFC Module Cable, and NFC Antenna (for Selected Models)
  84
- Webcam Privacy Shutter
  85
- Front Camera Module
  86
- Rear Camera
  86
- Microphone Assembly
  87
- Front Camera Bracket
  88
- System Board
  88
- Replace the System Board
  89
Appendix A. Notices

91
Appendix B. Abbreviation Table

93

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