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Lenovo Manuals
Laptop
20MU
Hardware maintenance manual
Lenovo 20MU Hardware Maintenance Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
About this Manual
Chapter 1. Safety Information
General Safety
Electrical Safety
Safety Inspection Guide
Handling Devices that Are Sensitive to Electrostatic Discharge
Grounding Requirements
Safety Notices (Multilingual Translations)
Chapter 2. Important Service Information
Strategy for Replacing Frus
Strategy for Replacing a Hard Disk Drive or a Solid-State Drive
Important Notice for Replacing a System Board
How to Use Error Message
Strategy for Replacing Frus for CTO, Special-Bid, and Standard Models
Product Definition
FRU Identification
Chapter 3. General Checkout
What to Do First
Checkout Guide
Diagnosing Problems
Quick Test Programs
UEFI Diagnostic Program
Bootable Diagnostic Programs
Power System Checkout
Checking the Ac Power Adapter
Checking the Removable Battery and the Operational Charging
Checking the Coin-Cell Battery
Chapter 4. Related Service Information
Recovery Information for the Windows 10 Operating System
Resetting Your Computer
Using Advanced Startup Options
Recovering Your Operating System if Windows 10 Fails to Start
Creating and Using a Recovery USB Drive
Passwords
Power-On Password
Hard Disk Password
Supervisor Password
How to Remove the Power-On Password
How to Remove the Hard Disk Password
Power Management
Sleep Mode
Hibernation Mode
Symptom-To-FRU Index
Numeric Error Codes
Error Messages
Beep Errors
No-Beep Symptoms
LCD-Related Symptoms
Intermittent Problems
Undetermined Problems
Chapter 5. Status Indicators
Chapter 6. Using the Special Keys
Chapter 7. Locations
Locating Computer Controls, Connectors, and Indicators
Front View
Left-Side View
Right-Side View
Bottom View
Locating Frus and Crus
Major Frus and Crus
LCD Frus
Miscellaneous Parts
Connector and Cable Guide
Looking up FRU Information
Chapter 8. FRU Replacement Notices
Screw Notices
Retaining Serial Numbers
Restoring the Serial Number of the System Unit
Retaining the UUID
Reading or Writing the ECA Information
Chapter 9. Removing or Replacing a FRU
General Guidelines
Disabling the Built-In Battery
1010 Removable Battery
1020 Nano-SIM Card
1030 Base Cover Assembly
1040 Memory Module
1050 Internal Storage Drive
1060 Wireless-WAN Card
1070 Wireless-LAN Module
1080 M.2 Solid-State Drive in the Wireless-WAN-Card Slot
1090 Keyboard
1100 Coin-Cell Battery
1110 Speaker Assembly
1120 Built-In Battery
1130 Smart-Card Reader Assembly
1140 Thermal Fan Assembly
1150 Trackpad and Trackpad Cable
1160 System Board
1170 Power-Button Card and Cable
1180 Fingerprint-Reader Assembly
1190 LCD Unit
1200 Keyboard Bezel Assembly
2010 LCD Bezel Assembly
2020 LCD Panel
2030 LCD Hinge Assembly
2040 Camera/Microphone Module
2050 Camera and LED Cable, and LCD Cable
2060 Wireless-LAN/WAN Antenna Assembly
2070 LCD Rear-Cover Assembly
Appendix A. Notices
Electronic Emissions Notices
Trademarks
Appendix B. Abbreviation Table
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A485
Hardware Maintenance Manual
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