Lenovo 21L8S04B00 Manuals

Manuals and User Guides for Lenovo 21L8S04B00. We have 1 Lenovo 21L8S04B00 manual available for free PDF download: Hardware Maintenance Manual

Lenovo 21L8S04B00 Hardware Maintenance Manual

Lenovo 21L8S04B00 Hardware Maintenance Manual (128 pages)

Brand: Lenovo | Category: Laptop | Size: 58.55 MB

Table of Contents

Table of Contents
3
About this Manual
5
Chapter 1. Safety Information

7
Chapter 2. Important Service Information

25
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
  30
- Power System Checkout
  30
- Checking the Ac Power Adapter
  31
- Checking the Built-In Battery and Operational Charging
  31
- Checking the Coin-Cell Battery
  32
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. Special Keys

45
Chapter 6. Locations

47
- Locating Computer Controls and Connectors
  47
- Front View
  47
- Side View
  50
- Rear View
  52
- Bottom View
  53
- Locating Frus and Crus
  55
- Major Frus and Crus
  56
- LCD Frus and Crus
  61
- Miscellaneous Parts
  63
- Connector and Cable Guide
  64
- Looking up FRU Information
  67
Chapter 7. FRU Replacement Notices

69
- Service Tool Kit
  69
- Screw Notices
  69
- Retaining Serial Numbers
  70
- Restoring the Serial Number of the System Unit
  70
- Retaining the UUID
  71
- Reading or Writing the ECA Information
  72
Chapter 8. Removing or Replacing a FRU

73
- General Guidelines
  73
- Before Servicing the Computer
  73
- Disable Fast Startup and the Built-In Battery
  73
- Removing the Nano-SIM Card and Nano-SIM-Card Tray
  74
- Keyboard
  74
- Remove the Keyboard
  74
- Install the Keyboard
  76
- Base Cover Assembly
  78
- Applying Labels to the Base Cover Assembly
  80
- Solid-State Drive and Its Bracket (for Selected Models)
  82
- Replace the 2242 M.2 Solid-State Drive and Its Bracket
  82
- Replace the 2280 M.2 Solid-State Drive
  83
- Wireless WAN Card (for Selected Models)
  84
- Memory Module
  85
- Speaker Assembly
  86
- Built-In Battery
  87
- Thermal Fan
  88
- Heat Sink
  90
- Fingerprint Reader Cable (for Selected Models)
  91
- For Thinkpad L14 Gen 5
  91
- For Thinkpad L16 Gen 1
  91
- USB Bracket
  92
- USB I/O Board and Cable
  92
- For Thinkpad L14 Gen 5
  92
- For Thinkpad L16 Gen 1
  94
- System Board I/O Bracket
  95
- Smart Card Reader and Cable (for Selected Models)
  96
- For Thinkpad L14 Gen 5
  96
- For Thinkpad L16 Gen 1
  97
- Coin-Cell Battery
  98
- Trackpad and Trackpad Cable
  99
- For Thinkpad L14 Gen 5
  99
- For Thinkpad L16 Gen 1
  100
- NFC Module (for Selected Models)
  102
- Power Button with or Without Fingerprint Reader
  103
- For Thinkpad L14 Gen 5
  103
- For Thinkpad L16 Gen 1
  104
- System Board
  104
- For Thinkpad L14 Gen 5
  105
- For Thinkpad L16 Gen 1
  107
- How to Configure Keyboard Language in UEFI BIOS
  108
- LCD Unit
  108
- For Thinkpad L14 Gen 5
  108
- For Thinkpad L16 Gen 1
  110
- Keyboard Bezel Assembly
  112
- LCD Bezel with Webcam Privacy Shutter
  112
- LCD Hinges
  113
- LCD Panel and Elastic Adhesive Tapes
  114
- Removal Steps
  114
- Installation Steps
  115
- How to Install New Color Profiles after Replacing the LCD Panel
  117
- Led/Camera Cable
  117
- Camera-And-Microphone Module (for Selected Models)
  117
- Wireless Antenna Assembly
  118
- Wireless WAN Antennas (for Selected Models)
  118
- Wireless LAN Antennas
  119
- Antenna Locations
  120
- LCD Cover Assembly
  121
Appendix A. Notices

123
Appendix B. Abbreviation Table

125

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