Lenovo 20HJ Manuals

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

Lenovo 20HJ Hardware Maintenance Manual

Lenovo 20HJ Hardware Maintenance Manual (122 pages)

Brand: Lenovo | Category: Laptop | Size: 55 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
- Lenovo Companion
  30
- Quick Test Programs
  30
- UEFI Diagnostic Program
  31
- Bootable Diagnostic Programs
  31
- Power System Checkout
  32
- Checking the Ac Power Adapter
  32
- Checking the Operational Charging
  33
- Checking the Battery Pack
  33
- Checking the Coin-Cell Battery
  33
Chapter 4. Related Service Information

35
- Recovery Overview for the Windows 10 Operating System
  35
- Resetting Your Computer
  35
- Using Advanced Startup Options
  35
- Recovering Your Operating System if Windows 10 Fails to Start
  36
- Creating and Using a Recovery USB Drive
  36
- Passwords
  36
- Power-On Password
  37
- Hard Disk Password
  37
- Supervisor Password
  37
- How to Remove the Power-On Password
  37
- How to Remove the Hard Disk Password
  38
- Power Management
  38
- Sleep Mode
  38
- Hibernation Mode
  39
- Symptom-To-FRU Index
  39
- Numeric Error Codes
  40
- Error Messages
  41
- Beep Errors
  42
- No-Beep Symptoms
  43
- LCD-Related Symptoms
  43
- Intermittent Problems
  43
- Undetermined Problems
  44
Chapter 5. Configuring RAID

45
Chapter 6. Special Keys

49
Chapter 7. Locations

51
- Locating Computer Controls, Connectors, and Indicators
  51
- Front View
  51
- Side Views
  51
- Rear View
  52
- Bottom View
  52
- Status Indicators
  52
- Locating Frus and Crus
  55
- Major Frus
  56
- LCD Frus
  58
- Miscellaneous Parts
  60
- Connector and Cable Guide
  61
- Looking up FRU Information
  64
Chapter 8. FRU Replacement Notices

65
Chapter 9. Removing or Replacing a FRU

69
- General Guidelines
  69
- Common Service Tools
  70
- Before Servicing the Computer
  70
- Removing the Micro SIM Card
  70
- Removing the Dummy Expresscard
  70
- Removing a Major FRU
  71
- 1010 Battery
  71
- 1020 Bottom Cover
  72
- 1030 Storage Drive
  72
- 1040 Memory Module under the Bottom Cover
  77
- 1050 Coin-Cell Battery
  77
- 1060 Keyboard
  78
- 1070 Memory Module Bracket and Memory Module under the Keyboard
  82
- 1080 Wireless LAN Card
  83
- 1090 Wireless WAN Card
  84
- 1100 Keyboard Bezel Assembly
  85
- 1110 Color Sensor Cable, Fingerprint Reader Cable, and Trackpad Cable
  88
- 1120 Hinge Caps
  89
- 1130 LCD Unit
  90
- 1140 Chassis Assembly
  92
- 1150 Smart Card Reader, Smart Card Reader Cable, or Dummy Smart Card
  94
- 1160 Speaker Assembly and Speaker Rubber
  96
- 1170 Thermal Fan Assembly
  97
- 1180 System Board
  98
- 1190 Base Cover Assembly
  101
- Removing an LCD FRU for Non-Touch Models
  102
- 2010 LCD Bezel Assembly
  102
- 2020 Bezel Support Rubber
  103
- 2030 LED Card
  104
- 2040 LCD Panel, LCD Cable, and Hinge Assembly
  104
- 2050 Camera Card and LED Camera Cable Assembly
  106
- 2060 Antenna Kit and LCD Rear Cover Assembly
  108
- Removing an LCD FRU for Touch Models
  110
- 3010 LCD Strip Bezel
  110
- 3020 LED Card
  111
- 3030 LCD Panel Assembly, LCD Cable, and Hinge Assembly
  111
- M2.5 × 4 MM, Flat-Head, Nylon-Coated
  112
- Color Torque
  112
- (3.0 Kgf-CM)
  112
- 3040 Camera Card and LED Camera Cable Assembly
  114
- Silver 0.181 Nm (1.85 Kgf-CM)
  114
- 3050 Antenna Kit and LCD Rear Cover Assembly
  116
Appendix A. Notices

119
- Electronic Emissions Notices
  120
- Trademarks
  120

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