Lenovo M90a Gen 5 - User Manual

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M90a Gen 5

Hardware Maintenance Manual

Main Page

Table of Contents3
About this Manual5
Chapter 1. Important Safety Information7
General Safety7
Electrical Safety8
Safety Inspection Guide9
Handling Electrostatic Discharge-Sensitive Devices10
Grounding Requirements10
Safety Notices (Multi-Lingual Translations)10
Chapter 2. Important Service Information33
Strategy for Replacing Frus33
Strategy for Replacing a Hard Disk Drive or a Solid-State Drive33
Important Notice for Replacing a System Board33
How to Use Error Codes34
Strategy for Replacing Frus for CTO, Special-Bid, and Standard Models34
Product Definition34
FRU Identification34
Chapter 3. Product Overview35
Front35
Rear37
USB Specifications38
Chapter 4. Service Checkout and Symptom-To-FRU Index39
Service Checkout39
Problem Determination Tips39
Symptom-To-FRU Index40
Hard Disk Drive Boot Error40
Power Supply Problems41
Beep Symptoms41
POST Error Codes42
Miscellaneous Error Conditions43
Undetermined Problems45
Chapter 5. Diagnostics47
Basic Procedure for Resolving Computer Problems47
UEFI Diagnostic Program47
Lenovo Diagnostic Tools48
The Vantage App48
Self-Help Resources48
Chapter 6. Hardware Removal and Installation51
Handling Static-Sensitive Devices51
Service Tool Kit51
Major Frus and Crus53
System Board57
Removing and Installing Hardware58
External Options58
Computer Stand58
Rear I/O Cover63
System Board Shield64
VESA Mount Bracket65
Cover Presence Switch (Intrusion Switch)66
Primary Hard Disk Drive66
Optical Drive67
Secondary Hard Disk Drive and Bracket69
M.2 Solid-State Drive70
Memory Module71
Wi-Fi Card and Wi-Fi Card Shield72
Serial Connector Module73
Card Reader Board74
GPU Card74
System Fan75
Heat Sink76
Microprocessor77
System Board78
Integrated Camera and Microphone Module79
Power Supply Assembly (with AC-In Bracket)80
Left I/O Bracket81
Right Bezel82
Main Frame83
Front Decoration Cover84
Radar Card85
Internal Speakers87
LCD Bracket and LCD Panel88
Wi-Fi Antennas89
LCD Backlight Cable, Touch Board Cable, and LCD LVDS Cable90
Notices and Trademarks93

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Lenovo M90a Gen 5 Specifications

General

Brand	Lenovo
Model	M90a Gen 5
Category	Desktop
Language	English

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Table of Contents

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