Lenovo 21AL Manuals

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

Lenovo 21AL Hardware Maintenance Manual

Lenovo 21AL Hardware Maintenance Manual (104 pages)

Brand: Lenovo | Category: Laptop | Size: 46.11 MB

Table of Contents

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

7
Chapter 2. Important Service Information

27
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
  33
- 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
- Nvme Passwords
  36
- Supervisor Password
  36
- System Management Password
  36
- How to Remove the Power-On Password
  37
- How to Remove the Nvme 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. Special Keys

45
Chapter 6. Locations

47
- Locating Computer Controls and Connectors
  47
- Front
  47
- Left and Right
  49
- Rear
  51
- Bottom
  51
- Locating Frus and Crus
  52
- Major Frus and Crus
  53
- LCD Frus and Crus
  56
- 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
- Reading or Writing the ECA Information
  65
Chapter 8. Removing or Replacing an FRU

67
Appendix A. Notices

99
Appendix B. Abbreviation Table

101

Advertisement

Advertisement

Related Products

Lenovo Categories

Laptop

Desktop

Monitor

More Lenovo Manuals