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Acer AO725 Acer Aspire One AO725 Netbook Service Guide - Page 179

Start, Control Panel, Hardware and Sound, Sound, Con Online Support Information

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6. Navigate to Start Control Panel Hardware and Sound Sound. Confirm that Speakers are selected as the default audio device (green check mark). NOTE: NOTE: If Speakers does not show, right-click on the Playback tab and select Show Disabled Devices (clear by default). 7. Select Speakers and click Configure to start Speaker Setup. Follow the on-screen prompts to configure the speakers. 8. Remove any recently installed hardware or software. 9. Restore system and file settings from a known good date using System Restore. 10. If the issue is remains, repeat step 9, selecting an earlier time and date. 11. Reinstall the operating system. 12. If the issue is still not resolved, refer to Online Support Information. Troubleshooting 4-11

Section	Page
Hardware Specifications	11
Features	15
Operating System	15
Platform	15
System Memory	15
Display	15
Audio	15
Graphics	16
Storage	16
Webcam	16
Wireless and Networking	17
Privacy Control	17
Dimension and Weight	17
Power Adapter and Battery	17
Input and Control	18
Input and Output (I/O) Ports	18
Environment	18
Software	19
Eco-compliance	20
Optional and Accessories	20
Warranty	20
Notebook Tour	21
Touchpad Basics	28
Using the Keyboard	29
Windows Keys	30
Hotkeys	31
System Block Diagram	33
Specification Tables	34
Computer specifications	34
System Board Major Chips	35
Processor	35
Processor Specifications	35
CPU Fan True Value Table	36
System Memory	36
Memory Combinations	36
Video Interface	37
BIOS	37
Keyboard	37
Hard Disk Drive (AVL components)	38
LCD 11.6”	39
LCD 11.6” (Continued)	40
LCD Inverter (not available with this model)	41
Display Supported Resolution (LCD Supported Resolution)	41
Graphics Controller	41
Display Supported Resolution (GPU Supported Resolution)	42
LAN Interface	42
Bluetooth Interface (not available in this model)	42
Bluetooth Module	43
Wireless Module 802.11 a/b/g/n	43
Wireless Module 802.11 b/g/n	43
Mini Card Wireless Networking Card	44
3G Card	44
Audio Codec and Amplifier	45
Audio Codec and Amplifier (Continued)	46
Audio Interface	46
1.0M HD Camera	47
VRAM (not available in this model)	47
USB Port	47
HDMI Port	48
Battery	48
AC Adapter	48
System Power Management	49
Card Reader	49
System LED Indicator	50
System DMA Specification	50
System Interrupt Specification	51
System I/O Address Map	56
Memory Address Map	58
System Utilities	61
BIOS Setup Utility	63
Navigating the BIOS Utility	63
BIOS	64
Information	64
Main	66
Security	68
Boot	72
Exit	73
BIOS Flash Utilities	74
DOS Flash Utility	75
WinFlash Utility	77
Clearing BIOS Passwords	78
Removing Insyde BIOS Passwords	79
Removing Insyde HDD Password	81
Miscellaneous Tools	82
Using DMITools	82
Using UUIDTools	86
Using the LAN MAC EEPROM Utility	88
Crisis Disk Recovery	89
Machine Maintenance Procedures	91
Introduction	95
General Information	95
Recommended Equipment	95
Pre-disassembly Instructions	96
Disassembly Process	97
External Module Disassembly Process	98
External Module Disassembly Flowchart	98
Dummy Card Removal	99
Battery Pack Removal	100
Base Door Removal	101
WLAN (Wireless Local Area Network) Module Removal	102
DIMM (Dual In-line Memory Module) Module Removal	104
HDD (Hard Disk Drive) Module Removal	105
Main Unit Disassembly Process	107
Main Unit Disassembly Flowchart	107
Upper Case Removal	108
Switch Board Removal	110
Keyboard Module Removal	112
IO Board Removal	115
LED Board Removal	117
Mainboard Removal	119
RTC battery Removal	122
Thermal Module Removal	123
Speakers Removal	124
LCD (Liquid Crystal Display) Module Removal	125
LCD Module Disassembly Process	127
LCD Module Disassembly Flowchart	127
LCD Bezel Removal	128
Camera Module Removal	131
LCD Hinges Removal	132
LCD Panel Removal	133
LVDS and Camera Cable Removal	135
LCD Reassembly Process	136
Replacing the LVDS and Camera Cable	136
Replacing the LCD Panel	137
Replacing the LCD Hinges	139
Replacing the Camera Module	140
Replacing the LCD Bezel	141
Main Unit Reassembly Process	143
Replacing the LCD (Liquid Crystal Display) Module	143
Replacing the Speakers	145
Replacing the Thermal Module	146
Replacing the RTC battery	148
Replacing the Mainboard	149
Replacing the LED Board	151
Replacing the IO Board	152
Replacing the Keyboard Module	154
Replacing the Switch Board	157
Replacing the Upper Case	158
External Module Reassembly Process	160
Replacing the HDD (Hard Disk Drive) Module	160
Replacing the DIMM (Dual In-line Memory Module) Module	162
Replacing the WLAN (Wireless Local Area Network) Module	163
Replacing the Base Door	164
Replacing the Battery Pack	166
Replacing the Dummy Card	167
Troubleshooting	169
Introduction	171
General Information	171
Power On Issues	172
No Display Issues	173
LCD Picture Failure	175
Internal Keyboard Failure	176
Touchpad Failure	177
Internal Speaker Failure	178
Internal Microphone Failure	180
USB Failure	181
Other Functions Failure	182
Intermittent Problems	183
Undetermined Problems	183
Post Codes	184
Jumper and Connector Locations	193
Mainboard Jumper and Connector Locations	195
Clearing Password Check and BIOS Recovery	197
Clearing Password Check	197
BIOS Recovery by Crisis Disk	199
FRU (Field Replaceable Unit) List	201
Exploded Diagrams	204
FRU List	208
Screw List	220
Model Definition and Configuration	221
Acer Aspire One 725	223
Test Compatible Components	267
Microsoft® Windows® 7 Environment Test	270
Online Support Information	275

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