Lenovo 21FB Manuals

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

Lenovo 21FB Hardware Maintenance Manual

Lenovo 21FB Hardware Maintenance Manual (118 pages)

Brand: Lenovo | Category: Laptop | Size: 51.69 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
  31
Chapter 4. Related Service Information

33
- Reset or Restore Windows
  33
- Passwords
  33
- Power-On Password
  33
- Nvme Passwords
  33
- 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
  35
- Power Management
  36
- Sleep Mode
  36
- Hibernation Mode
  36
- Symptom-To-FRU Index
  37
- Numeric Error Codes
  38
- Error Messages
  39
- Beep Errors
  39
- No-Beep Symptoms
  41
- LCD-Related Symptoms
  42
- Intermittent Problems
  43
- Undetermined Problems
  43
Chapter 5. RAID

45
Chapter 6. Special Keys

49
Chapter 7. Locations

51
- Locating Computer Controls and Connectors
  51
- Front View
  51
- Side View
  52
- Rear View
  53
- Bottom View
  53
- Locating Frus and Crus
  54
- Major Frus and Crus
  55
- LCD Frus and Crus
  58
- Miscellaneous Parts
  60
- Connector and Cable Guide
  60
- Looking up FRU Information
  63
Chapter 8. FRU Replacement Notices

65
- Service Tool Kit
  65
- Screw Notices
  65
- Retaining Serial Numbers
  66
- Restoring the Serial Number of the System Unit
  66
- Retaining the UUID
  67
- Reading or Writing the ECA Information
  67
Chapter 9. Removing or Replacing a FRU

69
- General Guidelines
  69
- Before Servicing the Computer
  69
- Disabling the Built-In Battery
  69
- Removing the Nano-SIM Card and Tray (for Selected Models)
  70
- Removing the SD Card (if Any)
  70
- 1010 Service Door
  71
- 1020 Keyboard
  71
- 1030 Service Bracket
  73
- 1040 Wireless WAN Card (for Selected Models)
  74
- 1050 Memory Module
  75
- For Access, Remove this FRU
  75
- 1020 Keyboard
  76
- 1060 M.2 2280 Solid-State Drive
  77
- Step Screw (Quantity)
  78
- Step Color
  78
- Black
  78
- M2 × 3 MM, Flat-Head, Nylon-Coated (1) Black
  78
- Torque
  78
- (1.85 Kgf-CM)
  78
- 1070 Base Cover Assembly
  79
- (1.85 Kgf-CM)
  79
- 1080 Thermal Fan Assembly
  80
- 1090 Dummy GPU Board Cable (for Models Without Discrete GPU)
  82
- 1100 GPU Board or Dummy GPU Board
  82
- 1110 I/O Board and Cable
  83
- 1120 Built-In Battery
  84
- 1130 Coin-Cell Battery
  85
- 1140 NFC Board and Cable (for Selected Models)
  86
- 1150 Keyboard Bezel Assembly
  87
- 1160 Power Button with Fingerprint Reader and Bracket
  88
- 1170 Trackpad and Trackpad Cable
  90
- 1180 Smart Card Reader and Cable (for Selected Models)
  91
- 1190 Speaker
  92
- 1200 System Board and Beeper
  93
- 1210 DC-In Cable and Bracket
  96
- 1220 Wireless WAN Antenna Assembly (for Selected Models)
  97
- 1230 Hinge Caps
  98
- 1240 LCD Unit
  99
- 1250 Chassis Assembly
  101
- 2010 LCD Strip Cover (for Touch Models)
  101
- 2020 LCD Bezel (for Non-Touch Models)
  102
- 2030 LCD Panel and LCD Cable
  102
- 2040 LCD Hinges
  106
- 2050 PMIC Board (for Touch Models)
  107
- (For Selected Models)
  108
- 2070 Wireless Antenna Assembly
  109
- 2080 LCD Cover Assembly
  111
Appendix A. Notices

113
Appendix B. Abbreviation Table

115

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