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Acer Aspire 4250 Acer Aspire 4250 Notebook Service Manual - Page 142

USB Failure,

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USB Failure 0 If the USB fails, perform the following: Start OK Check USB/B to M/B cable OK Check USB/B NG Re-assemble the USB/B cable to M/B OK NG Swap USB/B and USB cable Swap M/B Figure 4-8. USB Failure 4-14 Troubleshooting

Section	Page
Hardware Specifications	11
Features	15
Operating System	15
Platform	15
System Memory	15
Display	15
Audio Subsystem	15
Graphics	16
Storage Subsystem	16
Privacy Control	16
Optical Media Drive	17
Communication	17
Dimension and Weight	17
Power Adapter and Battery	17
Special Keys and Controls	18
I/O Ports	18
Optional Items	18
Warranty	18
Environment	18
Software	19
Notebook Tour	20
Touchpad Basics	28
Using the Keyboard	29
Windows Keys	30
Hotkeys	31
Specification Tables	34
Computer specifications	34
Processor	35
Processor Specifications	35
CPU Fan True Value Table	36
GPU Fan True Value Table	36
System Memory	36
Memory Combinations	37
Video Interface	37
BIOS	37
LAN Interface	38
Keyboard	38
Hard Disk Drive (AVL components)	39
Hard Disk Drive (AVL components) (Continued)	40
Super-Multi Drive	41
Super-Multi Drive (Continued)	42
Super-Multi Drive (Continued)	43
LED 14.0”	44
LCD Inverter (not available with this model)	44
Display Supported Resolution (LCD Supported Resolution)	45
Display Supported Resolution (GPU Supported Resolution)	45
Bluetooth Interface (not available with this model)	46
Mini Card	46
3G Card (not available in this model)	46
Audio Codec and Amplifier	47
Audio Interface	48
Battery	48
VRAM (not available in this model)	49
USB Port	49
AC Adapter	49
System Power Management	50
Card Reader	50
System LED Indicator	51
System DMA Specification	51
System Utilities	57
BIOS Setup Utility	59
Navigating the BIOS Utility	59
BIOS	60
Information	60
Main	62
Security	64
Boot	68
Exit	69
BIOS Flash Utilities	70
DOS Flash Utility	71
WinFlash Utility	73
Clearing BIOS Passwords	74
Removing BIOS Passwords	75
Removing Insyde HDD Password	77
Miscellaneous Tools	78
Using DMITools	78
Using UUIDTools	82
Using the LAN MAC EEPROM Utility	83
Crisis Disk Recovery	84
Machine Maintenance Procedures	85
Introduction	89
General Information	89
Recommended Equipment	89
Maintenance Flowchart	90
Getting Started	91
Battery Pack Removal	92
Battery Pack Installation	92
Dummy Card Removal	93
Dummy Card Installation	93
Keyboard Removal	94
Keyboard Installation	95
Base Assembly Removal	96
Base Assembly Installation	97
ODD (Optical Disk Drive) Module Removal	98
ODD Module Installation	99
USB Module Removal	100
USB Module Installation	101
HDD (Hard Disk Drive) Module Removal	102
HDD Module Installation	103
Mainboard Removal	104
Mainboard Installation	106
DIMM (Dual In-line Memory Module) Module Removal	107
DIMM Module Installation	108
WLAN (Wireless Local Area Network) Module Removal	109
WLAN Module Installation	110
Thermal Module Removal	111
Thermal Module Installation	111
Power Switch Board Removal	113
Power Switch Board Installation	113
Speaker Module Removal	114
Speaker Module Installation	115
LCD (Liquid Crystal Display) Module Removal	116
LCD Module Installation	117
DC-in Jack Removal	118
DC-in Jack Installation	119
LCD Bezel Removal	120
LCD Bezel Installation	121
Camera Module Removal	122
Camera Module Installation	123
LCD Panel Removal	124
LCD Panel Installation	125
LCD Bracket Removal	126
LCD Bracket Installation	126
LVDS Cable Removal	127
LVDS Cable Installation	128
Troubleshooting	129
Introduction	131
General Information	131
Power On Issues	132
No Display Issues	133
LCD Picture Failure	136
Internal Keyboard Failure	137
Touchpad Failure	138
Internal Speaker Failure	139
Internal Microphone Failure	141
USB Failure	142
Other Functions Failure	143
Intermittent Problems	144
Undetermined Problems	144
Post Codes	145
Jumper and Connector Locations	153
Mainboard Jumper and Connector Locations	155
Clearing Password Check and BIOS Recovery	157
Clearing Password Check	157
Clear CMOS Jumper	158
BIOS Recovery by Crisis Disk	159
FRU (Field Replaceable Unit) List	161
Exploded Diagrams	164
FRU List	167
Screw List	180
Model Definition and Configuration	181
Acer Aspire 4250	183
Test Compatible Components	187
Microsoft® Windows® 7 Environment Test	190
Online Support Information	197

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