Table of Contents
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Table of Contents
Related Manuals for Lenovo 21LL
Summarization of Contents
Chapter 1. Safety Information
General safety
Rules to ensure general safety during and after maintenance.
Electrical safety
Rules to follow when working on electrical equipment.
Safety inspection guide
Checklist to assist in identifying potentially unsafe conditions.
Handling devices that are sensitive to electrostatic discharge
Guidelines for protecting against ESD damage.
Chapter 2. Important service information
Strategy for replacing FRUs
Guidelines and strategy for replacing Field Replaceable Units (FRUs).
FRU identification
Steps to identify FRUs for a product.
Chapter 3. General checkout
Diagnosing problems
Steps for troubleshooting computer problems.
UEFI diagnostic program
Using the preinstalled UEFI diagnostic program.
Chapter 4. Related service information
Symptom-to-FRU index
Index of symptoms and errors with possible causes and FRU actions.
Numeric error codes
List and explanation of numeric error codes encountered.
Chapter 6. Locations
Major FRUs and CRUs
Identification and classification of major FRUs and CRUs.
Chapter 8. Removing or replacing a FRU
General guidelines
General guidelines to observe when removing or replacing a FRU.
LCD module
Instructions to replace the LCD module.
Built-in battery
Instructions to replace the built-in battery.
System board
Instructions to replace the system board.
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