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Lenovo 21DC006DCA Hardware Maintenance Manual

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Contents
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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 an M.2 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 Battery and Operational Charging
Checking the Coin-Cell Battery
Chapter 4. Related Service Information
Reset or Restore Windows
Passwords
Power-On Password
Nvme Password
Supervisor Password
System Management Password
How to Remove the Power-On Password
How to Remove the Nvme Password
How to Remove the System Management Password
Power Management
Sleep Mode
Hibernation Mode
Symptom-To-FRU Index
Numeric Error Codes
Error Messages
Beep Errors
LCD-Related Symptoms
Intermittent Problems
Undetermined Problems
Chapter 5. Use the Keyboard Shortcuts
Chapter 6. Locations
Computer Controls, Connectors, and Indicators
Front View
Side View
Bottom View
Locating Frus and Crus
Major Frus
Miscellaneous Parts and Other Frus
Connector and Cable Guide
Looking up FRU Information
Chapter 7. FRU Replacement Notices
Service Tool Kit
Screw Notices
Retaining Serial Numbers
Restoring the Serial Number of the System Unit
Retaining the UUID
Reading or Writing the ECA Information
Chapter 8. Removing or Replacing a FRU
General Guidelines
Before Servicing the Computer
Disabling the Built-In Battery
Removing the SD Card
Removing a Major FRU
1010 Base Cover Assembly
1020 Nano-SIM-Card Tray (for Selected Models)
1030 Wireless WAN Card (for Selected Models)
1040 Memory Module
1050 Speaker Assembly
1060 Thermal Fan Assembly (for Non-RTX Models Only)
1070 Built-In Battery
1080 NFC Card and NFC Card Cable (for Selected Models)
1090 Coin-Cell Battery
1100 M.2 Solid-State Drive
1110 Wireless WAN Antenna Assembly with Sensor Cable
1120 DC-In Bracket and DC-In Cable
1130 Keyboard Subcard and Keyboard-Subcard Cable
1140 LCD Unit
1150 System Board and Buzzer with Cable (for Non-RTX Models Only)
1160 Combined System Board Assembly (for RTX Models Only) and Buzzer with Cable
1170 Trackpad and Trackpad Cable
1180 Power Button with Fingerprint Reader Assembly
1190 Keyboard Bezel Assembly
Appendix A. Notices

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Hardware Maintenance Manual

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Lenovo 21DC006DCA Hardware Maintenance Manual

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