Lenovo 20QU Manuals

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

Lenovo 20QU Hardware Maintenance Manual

Lenovo 20QU Hardware Maintenance Manual (115 pages)

Brand: Lenovo | Category: Laptop | Size: 40.23 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
- Recovery Information
  37
- Recovery Information for the Windows 10 Operating System
  37
- Passwords
  39
- Power-On Password
  39
- Hard Disk Password
  39
- Supervisor Password
  39
- System Management Password
  40
- How to Remove the Power-On Password
  40
- How to Remove the Hard Disk Password
  41
- How to Remove the System Management Password
  41
- Power Management
  42
- Sleep Mode
  42
- Hibernation Mode
  42
- Symptom-To-FRU Index
  43
- Numeric Error Codes
  44
- Error Messages
  45
- Beep Errors
  45
- LCD-Related Symptoms
  47
- Intermittent Problems
  47
- Undetermined Problems
  48
Chapter 5. Special Keys

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

111

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