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Acer Aspire 7250 Acer Aspire 7250 Service Guide - Page 140

Thermal Unit Failure,

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Thermal Unit Failure 0 If the Thermal Unit fails, perform the following, one at a time. Do not replace a non-defective FRU: Start Fan power wire well connected? No Check Connect Fan OK? No Replace thermal module Heatsink well seated? No Seat it well Replace M/B Figure 4-11. Thermal Unit Failure 4-16 Troubleshooting

Section	Page
SG_Aspire 7250_CH1	1
Features	1
Operating System	1
Platform	1
System Memory	1
Display	1
Graphics	1
Storage Subsystem	2
Audio Subsystem	2
Optical Media Drive	2
Communication	2
Privacy Control	3
Dimensions and Weight	3
Power Adapter and Battery	3
Special Keys and Controls	3
I/O Ports	3
Optional Items	5
Software	5
Environment	6
Notebook Tour	7
Top View	7
Left View	9
Right View	10
Base View	11
Indicators	12
Touchpad Basics	12
Using the Keyboard	13
Lock Keys	14
Windows Keys	15
Hotkeys	17
System Block Diagram	19
Specification Tables	20
Computer specifications	20
System Board Major Chips	21
Processor	21
Processor Specifications	21
CPU Fan True Value Table	22
System Memory	22
Memory configuration	22
Graphics Controller	23
Video Interface	23
BIOS	23
LAN Interface	24
Keyboard	24
Hard Disk Drive	25
Super-Multi Drive Interface	26
LED LCD	26
Display Supported Resolution (LCD Supported Resolution)	27
Graphics Controller	28
Display Supported Resolution (GPU Supported Resolution)	28
Display Supported Resolution (LCD panel Supported Resolution)	28
Camera	29
Audio Codec and Amplifier	29
Audio Interface	30
Wireless Module 802.11b/g/n	31
Battery	31
VRAM	31
USB Port	32
HDMI Port	32
AC Adapter	32
System Power Management	32
Card Reader	33
System LED Indicator	33
System DMA Specification	33
System Interrupt Specification	34
System IO Address Map	35
SG_Aspire 7250_CH2	37
Navigating the BIOS Utility	37
BIOS	38
Information	38
Main	40
Security	42
Boot	46
Exit	47
BIOS Flash Utilities	48
DOS Flash Utility	49
WinFlash Utility	51
Remove HDD Password Utilities	52
Removing BIOS Passwords	54
Cleaning BIOS Passwords	55
DMI Utilities	56
LAN EEPROM Utilities	62
SG_Aspire 7250_CH3	65
Recommended Equipment	65
Replacement Requirements	65
Pre-disassembly Instructions	66
Disassembly Process	67
External Module Disassembly Process	68
External Modules Disassembly Flowchart	68
Removing the Battery Pack	69
Removing the HDD Module	70
Removing the WLAN Module	73
Removing the ODD Module	75
Removing the Memory Module	76
Removing Main screws on bottom case	78
Main Unit Disassembly Process	79
Main Unit Disassembly Flowchart	79
Removing the Keyboard	80
Removing the TOP CASE Module	82
Removing ODD B/D&I/O B/D MODULE	86
Removing Mother board module	89
Removing Thermal module	92
LCD Module Disassembly Process	94
LCD Module Disassembly process Flowchart	94
Removing Hinge Module	95
Removing Bezel Module	96
Removing Panel Module	97
LCD Reassembly Procedure	100
Replacing the LCD PANEL Module	100
Replacing Bezel Module	103
Replacing Hinge Module	104
Main Unit Reassembly Process	106
Replacing Thermal Module	106
Replacing the Mainboard	107
Replacing ODD BD and IO BD Module on the bottom case	109
Replacing the Top case Module	112
Replacing Key board module	117
External Modules Reassembly Process	118
Replacing memory Module	118
Replacing ODD Module	119
Replacing the WLAN Module	120
Replacing HDD Module	122
Replacing Battery Module	124
SG_Aspire 7250_CH4	127
General Information	127
Power On Issues	128
No Display Issues	129
LCD Failure	131
Keyboard Failure	132
Touchpad Failure	133
Internal & External Speaker Failure	134
Microphone Failure	136
WLAN Failure	138
Card Reader Failure	139
Thermal Unit Failure	140
HDMI and CRT Failure	141
CD-ROM/DVD Failure	142
Other Functions Failure	143
Intermittent Problems	143
Undetermined Problems	143
Post Codes	144
POST Code Range	144
SG_Aspire 7250_CH5	157
Clearing Password Check	157
Clear CMOS Jumper	158
BIOS Recovery by Crisis Disk	159
SG_Aspire 7250_CH6	162
Top-Case Assembly Exploded Diagram	162
Bottom-Case Assembly Exploded Diagram	165
LCD COVER Assembly Exploded Diagram	167
LCD BEZEL Assembly Exploded Diagram	168
FRU List	170
SG_Aspire 7250_CH7	187
SG_Aspire 7250_CH8	208
Aspire 7250G	208

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