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Acer Aspire 4820TG Service Guide - Page 120

Replacing the Lower Covers, Secure the five captive screws to hold the cover in place.

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Replacing the Lower Covers 1. Replace the Lower Cover as shown. IMPORTANT:Press down around the perimeter of the cover to ensure that the all the securing tabs are snapped correctly. 2. Secure the five captive screws to hold the cover in place. 110 Chapter 3

Section	Page
System Specifications	11
Features	11
System Block Diagram	16
Your Acer Notebook tour	17
Front View	17
Closed Front View	19
Left View	19
Right View	20
Bottom View	21
Indicators	21
TouchPad Basics	23
Using the Keyboard	24
Lock Keys and embedded numeric keypad	24
Windows Keys	25
Hot Keys	26
Hardware Specifications and Configurations	27
System Utilities	35
BIOS Setup Utility	35
Navigating the BIOS Utility	35
Aspire 4820T BIOS	36
Information	36
Main	37
Security	38
Boot	41
Exit	42
BIOS Flash Utilities	43
DOS Flash Utility	44
WinFlash Utility	46
Remove HDD/BIOS Password Utilities	47
Machine Disassembly and Replacement	53
Disassembly Requirements	53
General Information	54
Pre-disassembly Instructions	54
Disassembly Process	54
External Module Disassembly Process	55
External Modules Disassembly Flowchart	55
Removing the Battery Pack	56
Removing the SD dummy card	57
Removing the SIM card	58
Removing the Lower Cover	59
Removing the Optical Drive Module	60
Removing the DIMM Modules	62
Removing the WLAN Module	63
Removing the Hard Disk Drive Module	64
Main Unit Disassembly Process	65
Main Unit Disassembly Flowchart	65
Removing the Keyboard	66
Removing the Upper Cover	68
Removing the LED Board	71
Removing the Switch Board	72
Removing the Left Speaker Module	73
Removing the USB Board	74
Removing the 3G Module	76
Removing the Bluetooth Module	77
Removing the Mainboard	79
Removing the Thermal Module	81
Removing the CPU	82
Removing the RTC Battery	83
Removing the WiFi Antenna Cable	83
Removing the Right Speaker	84
Removing the LCD Module	85
Removing the DC-In Cable	86
LCD Module Disassembly Process	87
LCD Module Disassembly Flowchart	87
Removing the LCD Bezel	88
Removing the Camera Module	89
Removing the LCD Panel	90
Removing the FPC Cable	91
Removing the Microphone Module	92
Removing the Hinges	92
Removing the Antennas	93
LCD Module Reassembly Procedure	95
Replacing the MIC and WiFi Antennas	95
Replacing the Microphone Module	96
Replacing the FPC Cable	97
Replacing the LCD Panel	97
Replacing the Webcam	98
Replacing the LCD Bezel	99
Main Module Reassembly Procedure	101
Replacing the DC-In Cable	101
Replacing the LCD Module	102
Replacing the Right Speaker	102
Replacing the RTC Battery	103
Replacing the CPU	104
Replacing the Thermal Module	104
Replacing the Mainboard	105
Replacing the Bluetooth Module	108
Replacing the 3G Module	108
Replacing the USB Board	110
Replacing the Left Speaker Module	110
Replacing the Switch Board	112
Replacing the LED Board	112
Replacing the Upper Cover	113
Replacing the Keyboard	116
Replacing the Hard Disk Drive Module	116
Replacing the WLAN Board	118
Replacing the DIMM Modules	118
Replacing the ODD Module	119
Replacing the Lower Covers	120
Replacing the Dummy Card	121
Replacing the SIM card	121
Replacing the Battery Pack	122
Troubleshooting	123
Common Problems	123
Power On Issue	124
No Display Issue	125
Random Loss of BIOS Settings	126
LCD Failure	127
Built-In Keyboard Failure	127
TouchPad Failure	128
Internal Speaker Failure	128
HDD Not Operating Correctly	130
ODD Failure	131
Wireless Function Failure	134
Thermal Unit Failure	134
External Mouse Failure	135
Other Failures	135
Intermittent Problems	136
Undetermined Problems	136
Post Codes	137
Jumper and Connector Locations	143
Top View	143
Bottom View	144
Clearing Password Check and BIOS Recovery	145
Clearing Password Check	145
BIOS Recovery by Crisis Disk	146
FRU (Field Replaceable Unit) List	147
Acer Aspire 4820T Exploded Diagrams	148
LCD Assembly	148
Acer Aspire 4820T FRU List	151
Screw List	157
Model Definition and Configuration	158
Acer Aspire 4820T Series	158
Test Compatible Components	221
Microsoft® Windows® 7 Environment Test	222
Online Support Information	223

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