Lenovo 21U3 Manuals

Manuals and User Guides for Lenovo 21U3. We have 1 Lenovo 21U3 manual available for free PDF download: Hardware Maintenance Manual

Lenovo 21U3 Hardware Maintenance Manual (110 pages)

Brand: Lenovo | Category: Laptop | Size: 48 MB

Table of Contents
3
About this Manual
5
Chapter 1. Safety Information
7
General Safety
7
Electrical Safety
7
Safety Inspection Guide
9
Handling Devices that Are Sensitive to Electrostatic Discharge
9
Grounding Requirements
10
Safety Notices (Multilingual Translations)
10
Chapter 2. Important Service Information
25
Strategy for Replacing Frus
25
Strategy for Replacing a Solid-State Drive
25
How to Use Error Message
26
Strategy for Replacing Frus for CTO, Special-Bid, and Standard Models
26
Product Definition
26
FRU Identification
26
Chapter 3. General Checkout
27
What to Do First
27
Checkout Guide
28
Diagnosing Problems
28
Quick Test Programs
29
UEFI Diagnostic Program
29
Bootable Diagnostic Programs
30
Power System Checkout
30
Checking the Ac Power Adapter
31
Checking the Built-In Battery and Operational Charging
31
Checking the Coin-Cell Battery
32
Chapter 4. Related Service Information
33
Reset or Restore Windows
33
Use Lenovo Recovery Options
33
Use Window Recovery Options
33
Passwords
33
Power-On Password
34
Nvme Passwords
34
Supervisor Password
34
System Management Password
34
How to Remove the Power-On Password
35
How to Remove the Nvme Password
35
How to Remove the System Management Password
36
Power Management
36
Sleep Mode
36
Hibernation Mode
37
Symptom-To-FRU Index
37
Numeric Error Codes
38
Error Messages
39
Battery-Charge LED Indicator Diagnosis
39
Beep Symptoms
41
LCD-Related Symptoms
42
Intermittent Problems
43
Undetermined Problems
43
Lenovo Memory Self Repair (for Intel Models Only)
44
Chapter 5. Special Keys
45
Chapter 6. Locations
47
Looking up FRU Information
47
Front
47
Left and Right
49
Bottom
51
Locating Frus and Crus
53
Major Frus and Crus
54
LCD Frus and Crus
56
Miscellaneous Parts
57
Connector and Cable Guide
57
Looking up FRU Information
61
Chapter 7. FRU Replacement Notices
63
Service Tool Kit
63
Screw Notices
63
Retaining Serial Numbers
64
Restoring the Serial Number of the System Unit
64
Retaining the UUID
65
Reading or Writing the ECA Information
66
Chapter 8. Removing or Replacing a FRU
67
General Guidelines
67
Before Servicing the Computer
67
Disable Fast Startup and the Built-In Battery
67
Base Cover Assembly
68
Applying Labels to the Base Cover Assembly
69
Memory Module
71
M.2 Solid-State Drive and M.2 Solid-State Drive Bracket
72
Built-In Battery
73
Wireless LAN Card
75
Thermal Fan Assembly (for Selected Models)
76
Fan (for Selected Models)
78
Thermal Assembly (for Selected Models)
79
I/O Board and I/O Board Cable
80
Power Button with or Without Fingerprint Reader and Fingerprint Reader Cable
83
I/O Bracket
84
Speaker Assembly
86
Coin-Cell Battery
86
Trackpad and Trackpad Cable
87
LCD Unit
89
LCD Bezel Sheet and LCD Bezel
92
LCD Panel and LCD Cover
93
LCD Hinges
94
Camera Module
95
Microphone Rubber
96
EDP Cable Assembly
97
Antenna Assembly
97
System Board
98
Replace the System Board
99
How to Input the Product Information with Thinkpad System Board Self Repair Tool
102
Keyboard Assembly
102
Appendix A. Notices
105
Appendix B. Abbreviation Table
107

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Lenovo 21U3 Hardware Maintenance Manual (110 pages)

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