Lenovo 20TH Manuals

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

Lenovo 20TH Hardware Maintenance Manual

Lenovo 20TH Hardware Maintenance Manual (117 pages)

Brand: Lenovo | Category: Laptop | Size: 26.67 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

31
- What to Do First
  31
- Checkout Guide
  32
- Diagnosing Problems
  32
- Quick Test Programs
  33
- UEFI Diagnostic Program
  33
- Bootable Diagnostic Programs
  33
- Power System Checkout
  34
- Checking the Ac Power Adapter
  34
- Checking the Battery and Operational Charging
  35
- Checking the Coin-Cell Battery
  35
Chapter 4. Related Service Information

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

49
Chapter 6. Locations

51
- Computer Controls, Connectors, and Indicators
  51
- Front
  51
- Base
  52
- Left
  53
- Right
  53
- Bottom
  54
- Locating Frus and Crus
  54
- Major Frus
  55
- LCD Frus
  57
- Miscellaneous Parts and Other Frus
  60
- Connector and Cable Guide
  60
- Looking up FRU Information
  62
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
  66
Chapter 8. Removing or Replacing a FRU

67
Appendix A. Notices

113

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