Lenovo 21A90025GE Manuals

Manuals and User Guides for Lenovo 21A90025GE. We have 1 Lenovo 21A90025GE manual available for free PDF download: Hardware Maintenance Manual

Lenovo 21A90025GE Hardware Maintenance Manual

Lenovo 21A90025GE Hardware Maintenance Manual (101 pages)

Brand: Lenovo | Category: Laptop | Size: 32.14 MB

Table of Contents

Table of Contents
3
About this Manual

5
Chapter 1. Safety Information

7
Chapter 2. Important Service Information

27
- Strategy for Replacing Frus
  27
- Strategy for Replacing Frus for CTO, Special-Bid, and Standard Models
  28
  - Product Definition
    28
  - FRU Identification
    29
Chapter 3. General Checkout

31
- What to Do First
  31
- Checkout Guide
  32
  - Diagnosing Problems
    32
  - Quick Test Programs
    32
  - UEFI Diagnostic Program
    33
  - Bootable Diagnostic Programs
    33
- Power System Checkout
  34
Chapter 4. Related Service Information

37
- Reset or Restore Windows
  37
- Passwords
  37
  - Power-On Password
    37
  - Nvme Password
    37
  - Supervisor Password
    38
  - System Management Password
    38
  - How to Remove the Power-On Password
    39
  - How to Remove the Nvme Password
    39
  - How to Remove the System Management Password
    39
- Power Management
  40
  - Sleep Mode
    40
  - Hibernation Mode
    41
- Symptom-To-FRU Index
  41
  - Numeric Error Codes
    42
  - Error Messages
    43
  - Beep Errors
    44
  - Beep Symptoms
    45
  - LCD-Related Symptoms
    45
  - Intermittent Problems
    46
  - Undetermined Problems
    46
Chapter 5. Special Keys

49
Chapter 6. Locations

51
- Locating Computer Controls, Connectors, and Indicators
  51
  - Front View
    51
  - Side View
    52
  - Bottom View
    53
  - Rear View
    53
- Locating Frus and Crus
  53
  - Major Frus and Crus
    55
  - LCD Frus
    57
  - Miscellaneous Parts
    58
  - Connector and Cable Guide
    58
- Looking up FRU Information
  61
Chapter 7. FRU Replacement Notices

63
- Service Tool Kit
  63
- Screw Notices
  63
- Retaining Serial Numbers
  64
  - Restoring the Serial Number of the System Unit
    64
  - Retaining the UUID
    65
Chapter 8. Removing or Replacing a FRU

67
- General Guidelines
  67
- Before Servicing the Computer
  68
  - Disabling the Built-In Battery
    68
  - Removing the Nano-SIM Card and the Nano-SIM-Card Tray
    68
- 1010 Keyboard
  69
- 1020 Base Cover Assembly
  70
- 1030 Speaker Assembly
  71
- 1040 Coin-Cell Battery
  72
- 1050 M.2 Solid-State Drive
  73
- 1060 Wireless WAN Card
  74
- 1070 Memory Module
  74
- 1080 DC-IN Bracket and DC-IN Cable
  75
- 1090 Thermal Fan Assembly
  76
- 1100 Built-In Battery
  77
- 1110 IO Bracket
  78
- 1120 Fingerprint Reader, Bracket and Cable
  79
- 1130 System Board
  80
- 1140 Smart Card Reader and Smart Card Reader Cable
  82
- 1150 LCD Unit
  83
- 1160 Keyboard Bezel Assembly
  85
- 2010 LCD Bezel Assembly
  85
- 2020 LCD Panel
  86
- 2030 Camera/MIC Combo Board
  88
- 2040 Camera/Led Cable
  89
- 2050 LCD Hinges
  90
- 2060 Wireless LAN/WAN Antenna Assembly
  91
- 2070 LCD Cover Assembly
  92
Appendix A. Notices

95
Appendix B. Abbreviation and Acronym Table

97

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