Lenovo 20N4 Manuals

Manuals and User Guides for Lenovo 20N4. We have 1 Lenovo 20N4 manual available for free PDF download: Hardware Maintenance Manual

Lenovo 20N4 Hardware Maintenance Manual

Lenovo 20N4 Hardware Maintenance Manual (111 pages)

Brand: Lenovo | Category: Laptop | Size: 73.32 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
  35
- 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 Symptoms
  46
- No-Beep Symptoms
  47
- LCD-Related Symptoms
  47
- Intermittent Problems
  48
- Undetermined Problems
  48
Chapter 5. Function Keys

51
Chapter 6. Locations

53
- Locating Computer Controls, Connectors, and Indicators
  53
- Front View
  53
- Base View
  54
- Left View
  54
- Right View
  55
- Bottom View
  55
- Rear View
  56
- Locating Frus and Crus
  56
- Major Frus and Crus
  57
- LCD Frus
  59
- Miscellaneous Parts and Other Frus
  61
- Connector and Cable Guide
  61
- Looking up FRU Information
  64
Chapter 7. FRU Replacement Notices

65
- Service Tool Kit
  65
- Screw Notices
  65
- Retaining Serial Numbers
  66
- Restoring the Serial Number of the System Unit
  66
- Retaining the UUID
  67
- Reading or Writing the ECA Information
  68
Chapter 8. Removing or Replacing a FRU

69
- General Guidelines
  69
- Before Servicing the Computer
  70
- Disabling the Built-In Battery
  70
- Removing a Major FRU
  70
- 1010 Removing the Nano-SIM Card and the Nano-SIM-Card Tray
  70
- 1020 Base Cover Assembly
  70
- 1030 Keyboard
  72
- 1040 M.2 Solid-State Drive
  75
- 1050 Wireless WAN Card
  76
- M2 × 2.5 MM, Big-Head, Nylon-Coated (1) Black
  76
- 1060 Memory Module
  77
- 1070 Speaker Assembly
  77
- 1080 Built-In Battery
  78
- Step Screw (Quantity) Color
  78
- Torque
  78
- Nm (1.85 Kgf-CM)
  78
- 1090 Thermal Fan Assembly
  79
- Torque
  79
- 1110 USB Cable and Board
  80
- 1120 RJ45 Cable and Board
  81
- Nm (1.85 Kgf-CM)
  82
- 1130 Power Button Board with Cable
  83
- 1140 Smart Card Reader or Dummy Smart Card Reader, and Smart Card Cable
  84
- 1150 Fingerprint Reader Cable, Bracket and Board
  86
- 1160 Coin-Cell Battery
  86
- 1170 NFC Module, Cable and Antenna
  87
- 1180 Trackpad and Cable
  88
- 1190 Hall Sensor Board with Cable
  89
- 1210 System Board
  90
- 1220 LCD Unit
  93
- 1230 Keyboard Bezel Assembly
  95
- Removing an LCD FRU
  96
- 2010 LCD Bezel Sheet and LCD Bezel
  96
- 2020 LCD Hinges
  97
- 2030 LCD Panel and LCD Elastic Adhesive Tape
  97
- 2040 LCD Cable
  100
- 2050 Camera/Microphone Module and Dummy Camera Module
  100
- 2060 Camera/Led Cable
  102
- 2070 Wireless Antenna Assembly
  103
- 2080 LCD Cover Assembly
  105
Appendix A. Notices

107

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