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Acer Aspire 4745G Service Guide - Page 79

Removing the CPU, See Removing the Thermal Module

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4. Using both hands, lift the Thermal Module clear of the Mainboard. Removing the CPU 1. See "Removing the Thermal Module" on page 68. 2. Using a phillips screw driver, rotate the CPU locking screw 180° counter-clockwise as shown. 3. Lift the CPU clear of the socket as shown. IMPORTANT:The pins on the underside of the CPU are very delicate. If they are damaged, the CPU may malfunction. Place the CPU on a clean, dry surface when it is not installed. Chapter 3 69

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	33
BIOS Setup Utility	33
Navigating the BIOS Utility	33
Aspire 4745 BIOS	34
Information	34
Main	35
Security	36
Boot	39
Exit	40
BIOS Flash Utilities	41
DOS Flash Utility	42
WinFlash Utility	44
Remove HDD/BIOS Password Utilities	45
Machine Disassembly and Replacement	51
Disassembly Requirements	51
General Information	52
Pre-disassembly Instructions	52
Disassembly Process	52
External Module Disassembly Process	53
External Modules Disassembly Flowchart	53
Removing the Battery Pack	54
Removing the SD dummy card	55
Removing the Lower Cover	56
Removing the Optical Drive Module	57
Removing the DIMM Modules	59
Removing the WLAN Module	60
Removing the Hard Disk Drive Module	61
Main Unit Disassembly Process	62
Main Unit Disassembly Flowchart	62
Removing the Keyboard	63
Removing the Upper Cover	65
Removing the Power Switch Board	68
Removing the Function Board	69
Removing the Left Speaker Module	70
Removing the USB Board	71
Removing the Bluetooth Module	73
Removing the LCD Module	74
Removing the Mainboard	75
Removing the Thermal Module	78
Removing the CPU	79
Removing the RTC Battery	80
Removing the WiFi Antenna Cable	80
Removing the Right Speaker	81
Removing the DC-In Cable	82
LCD Module Disassembly Process	83
LCD Module Disassembly Flowchart	83
Removing the LCD Bezel	84
Removing the Camera Module	85
Removing the LCD Panel	86
Removing the FPC Cable	87
Removing the Microphone Module	88
Removing the Hinges	88
Removing the Antennas	89
LCD Module Reassembly Procedure	91
Replacing the MIC and WiFi Antennas	91
Replacing the Microphone Module	92
Replacing the FPC Cable	93
Replacing the LCD Panel	93
Replacing the Webcam	94
Replacing the LCD Bezel	95
Main Module Reassembly Procedure	97
Replacing the DC-In Cable	97
Replacing the LCD Module	98
Replacing the Right Speaker	98
Replacing the RTC Battery	99
Replacing the CPU	100
Replacing the Thermal Module	100
Replacing the Mainboard	101
Replacing the Bluetooth Module	104
Replacing the USB Board	105
Replacing the TouchPad Bracket	105
Replacing the Left Speaker Module	106
Replacing the Function Board	107
Replacing the Power Switch Board	107
Replacing the Upper Cover	108
Replacing the Keyboard	111
Replacing the Hard Disk Drive Module	111
Replacing the WLAN Board	113
Replacing the DIMM Modules	113
Replacing the ODD Module	114
Replacing the Lower Covers	115
Replacing the Dummy Cards	116
Replacing the Battery Pack	116
Troubleshooting	117
Common Problems	117
Power On Issue	118
No Display Issue	119
Random Loss of BIOS Settings	120
LCD Failure	121
Built-In Keyboard Failure	121
TouchPad Failure	122
Internal Speaker Failure	122
HDD Not Operating Correctly	124
ODD Failure	125
Wireless Function Failure	128
Thermal Unit Failure	128
External Mouse Failure	129
Other Failures	129
Intermittent Problems	130
Undetermined Problems	130
Post Codes	131
Jumper and Connector Locations	137
Top View	137
Bottom View	138
Clearing Password Check and BIOS Recovery	139
Clearing Password Check	139
BIOS Recovery by Crisis Disk	140
FRU (Field Replaceable Unit) List	141
Acer Aspire 4745 Exploded Diagrams	142
LCD Assembly	142
Acer Aspire 4745 FRU List	145
Screw List	154
Model Definition and Configuration	156
Acer Aspire 4745 Series	156
Test Compatible Components	177
Microsoft® Windows® 7 Environment Test	178
Online Support Information	191

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