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ASPIRE 5251
Acer ASPIRE 5251 Service Guide
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Chapter 3
51
Removing the Logic Lower Door
1.
Remove two (2) screws from the logic lower
door
.
2.
Lift the door beginning from the inner edge as shown.
3.
Lift the door clear of the de
vice, exposing the HDD,
DIMM, and WLAN mo
dules.
Ste
p
Size
Quantity
Screw T
ype
Logic lower door
M2.5*8
2
60
62
Table of Contents
Default Chapter
2
Revision History
2
Conventions
4
Table of Contents
7
System Specifications
11
Features
11
Storage Subsystem
12
Optical Media Drive
12
Privacy Control
13
Dimensions and Weight
13
Power Subsystem
13
Special Keys and Controls
13
Optional Items
14
System Block Diagram
15
Your Acer Notebook Tour
16
Front View
16
Closed Front View
17
Left View
17
Right View
18
Bottom View
19
Indicators
19
Touchpad Basics
20
Using the Keyboard
21
Lock Keys and Embedded Numeric Keypad
21
Windows Keys
22
Hot Keys
23
Hardware Specifications and Configurations
24
System Utilities
35
BIOS Setup Utility
35
Navigating the BIOS Utility
35
Aspire 5251/5551G/5551 BIOS
36
Information
36
Main
37
Security
38
Setting a Password
39
Removing a Password
39
Changing a Password
40
Boot
41
Exit
42
BIOS Flash Utilities
43
DOS Flash Utility
44
Winflash Utility
46
Remove HDD/BIOS Password Utilities
47
Using Boot Sequence Selector
49
Using Dmitools
50
Using the Lan Mac Eeprom Utility
51
Machine Disassembly and Replacement
53
Disassembly Requirements
53
Pre-Disassembly Instructions
54
Disassembly Process
55
External Module Disassembly Process
56
External Modules Disassembly Flowchart
56
Removing the Battery Pack
57
Removing the SD Dummy Card
58
Removing the Optical Drive Module
59
Removing the Logic Lower Door
61
Removing the 3G Cover
62
Removing the DIMM Module
63
Removing the WLAN Module
64
Removing the Hard Disk Drive Module
66
Main Unit Disassembly Process
68
Main Unit Disassembly Flowchart
68
Removing the Keyboard
69
Removing the Upper Cover
71
Removing the Left Speaker Module
75
Removing the Right Speaker Module
77
Removing the Power Board
79
Removing the Touchpad Bracket
80
Removing the Card Reader Board
82
Removing the USB Board
83
Removing the Bluetooth Board
85
Removing the Mainboard
86
Removing the Thermal Module
91
Removing the CPU
93
LCD Module Disassembly Process
94
LCD Module Disassembly Flowchart
94
Removing the LCD Assembly
95
Removing the LCD Bezel
98
Removing the Camera Module
99
Removing the LCD Panel
100
Removing the LCD Brackets and LVDS Cable
101
Removing the Microphone Cable
104
Removing the Antennas
106
LCD Module Reassembly Procedure
108
Replacing the Antennas
108
Replacing the Microphone Cable
110
Replacing the LCD Brackets and LVDS Cable
111
Replacing the LCD Panel
113
Replacing the Camera Module
114
Replacing the LCD Bezel
115
Replacing the LCD Assembly
116
Main Module Reassembly Procedure
119
Replacing the CPU
119
Replacing the Thermal Module
120
Replacing the Mainboard
122
Replacing the Bluetooth Board
125
Replacing the USB Board
126
Replacing the Card Reader Board
128
Replacing the Touchpad Bracket
129
Replacing the Power Board
131
Replacing the Right Speaker Module
132
Replacing the Left Speaker Module
133
Replacing the Upper Cover
134
Replacing the Keyboard
137
Replacing the Hard Disk Drive Module
138
Replacing the WLAN Module
139
Replacing the DIMM Modules
140
Replacing the 3G Cover
141
Replacing the Logic Lower Door
142
Replacing the ODD Module
143
Replacing the SD Dummy Card
144
Replacing the Battery
145
Troubleshooting
147
Common Problems
147
Power on Issue
148
No Display Issue
149
Random Loss of BIOS Settings
150
LCD Failure
151
Built-In Keyboard Failure
151
Touchpad Failure
152
Internal Speaker Failure
152
Sound Problems
153
Microphone Problems
153
HDD Not Operating Correctly
154
ODD Failure
155
Wireless Function Failure
158
Thermal Unit Failure
158
External Mouse Failure
159
Other Failures
159
Intermittent Problems
160
Undetermined Problems
160
Post Codes
161
Jumper and Connector Locations
165
Top View
165
Bottom View
166
USB/B Board
167
Power Board
167
CR/B Board
168
Clearing Password Check and BIOS Recovery
169
Clearing Password Check
169
Clear CMOS Jumper
169
BIOS Recovery by Crisis Disk
170
Bios Recovery Boot Block
170
BIOS Recovery Hotkey
170
Steps for BIOS Recovery from USB
170
FRU (Field Replaceable Unit) List
171
Aspire 5251/5551G/5551 Exploded Diagrams
172
Main Assembly
172
Base Assembly
173
LED Assembly
174
Aspire 5251/5551G/5551 FRU List
175
Screw List
176
Model Definition and Configuration
178
Aspire 5251
178
Aspire 5551G
180
Aspire 5551
189
Test Compatible Components
197
Microsoft® Windows® 7 Environment Test
198
Online Support Information
205
Index
207
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Acer ASPIRE 5251 Specifications
General
Brand
Acer
Model
ASPIRE 5251
Category
Laptop
Language
English
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