Lenovo 20U2 Manuals

Manuals and User Guides for Lenovo 20U2. We have 1 Lenovo 20U2 manual available for free PDF download: Hardware Maintenance Manual

Lenovo 20U2 Hardware Maintenance Manual

Lenovo 20U2 Hardware Maintenance Manual (127 pages)

Brand: Lenovo | Category: Laptop | Size: 71 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

29
- What to Do First
  29
- Checkout Guide
  30
- Diagnosing Problems
  30
- Quick Test Programs
  31
- UEFI Diagnostic Program
  31
- Bootable Diagnostic Programs
  31
- Power System Checkout
  32
- Checking the Ac Power Adapter
  32
- Checking the Built-In Battery and Operational Charging
  33
- Checking the Coin-Cell Battery
  33
Chapter 4. Related Service Information

35
- Reset or Restore Windows
  35
- Passwords
  35
- Power-On Password
  35
- Hard Disk Password
  35
- Supervisor Password
  36
- System Management Password
  36
- How to Remove the Power-On Password
  36
- How to Remove the Hard Disk Password
  37
- How to Remove the System Management Password
  37
- Power Management
  38
- Sleep Mode
  38
- Hibernation Mode
  39
- Symptom-To-FRU Index
  39
- Numeric Error Codes
  40
- Error Messages
  41
- Beep Errors
  41
- No-Beep Symptoms
  43
- LCD-Related Symptoms
  43
- Intermittent Problems
  44
- Undetermined Problems
  44
Chapter 5. Use the Keyboard Shortcuts

48
Chapter 6. Locations

51
- Locating Computer Controls, Connectors, and Indicators
  51
- Front
  51
- Base
  52
- Left
  53
- Right
  53
- Bottom
  54
- Locating Frus and Crus
  54
- Major Frus and Crus (for L14 Gen 1)
  55
- Major Frus and Crus (for L15 Gen 1)
  58
- LCD Frus
  61
- Miscellaneous Parts
  62
- Connector and Cable Guide
  63
- Looking up FRU Information
  68
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
  74
- Disabling the Built-In Battery
  74
- Removing the Nano-SIM Card and Nano-SIM-Card Tray
  74
- Removing the Microsd Card
  74
- 1010 Keyboard
  75
- 1020 Base Cover Assembly
  76
- 1030 Wireless-LAN Card
  78
- 1040 Wireless-WAN Card (for Selected Models)
  78
- 1050 Memory Module
  79
- 1060 I/O Bracket
  80
- 1070 Storage Drive
  81
- 1080 USB and Audio Card Bracket (for L15 Gen 1)
  83
- 1090 USB and Audio Card
  84
- 1100 Speaker Assembly
  85
- 1110 Thermal Fan, Heatsink, and Thermal Fan Assembly
  86
- 1120 Built-In Battery
  88
- 1130 Coin-Cell Battery
  89
- 1140 NFC Cable, NFC Module and NFC Antenna
  90
- 1150 Trackpad Cable and Trackpad
  92
- Step Screw (Quantity)
  93
- 1160 Fingerprint Reader Cable, Bracket and Module
  94
- For Access, Remove These Frus in Order
  94
- 1020 Base Cover Assembly
  94
- 1120 Built-In Battery
  94
- 1170 Power Button Card with Cable
  96
- Color Torque
  97
- 1180 Smart Card Reader,Cable and Bracket
  98
- Black 0.181 Nm (1.85 Kgf-CM)
  99
- 1190 System Board
  101
- 1200 LCD Unit
  106
- 2010 LCD Bezel
  110
- 2020 LCD Panel and LCD Elastic Adhesive Tapes
  111
- 2030 Camera/Microphone Module
  113
- 2040 Camera/Lcd Cable
  114
- 2050 Hinges
  116
- 2060 Wireless Antenna Assembly
  118
Appendix A. Notices

121
Appendix B. Abbreviation Table

123

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