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Acer 4535 5133 Service Guide - Page 168

Thermal Unit Failure, START, Fan power, wire well, connected?, Connect it well, Fan OK?, Replace

UPC - 884483711598

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Thermal Unit Failure If the Thermal Unit fails, perform the following actions one at a time to correct the problem. Do not replace non-defective FRUs: START Fan power wire well connected? No Connect it well Fan OK? No Replace UIFSNBM NPEVMF CPU heatsink well No seated? Seat it well CPU OK? No Replace CPU Replace M/B Chapter 4 159

Section	Page
System Specifications	10
Features	10
System Block Diagram	13
Your Acer Notebook tour	14
Front View	14
Closed Front View	15
Left View	16
Right View	17
Rear View	17
Bottom View	18
Easy-Launch Buttons	18
Touchpad Basics (with fingerprint reader)	19
Using the Keyboard	20
Lock Keys and embedded numeric keypad	20
Windows Keys	21
Special Key	22
Using the System Utilities	22
Acer GridVista (dual-display compatible)	23
Hardware Specifications and Configurations	24
System Utilities	32
BIOS Setup Utility	32
Navigating the BIOS Utility	32
Information	33
Main	34
Security	35
Boot	38
Exit	39
BIOS Flash Utilities	40
DOS Flash Utility	41
WinFlash Utility	43
Remove HDD/BIOS Password Utilities	45
Miscellaneous Utilities	47
Machine Disassembly and Replacement	50
Disassembly Requirements	50
General Information	51
Pre-disassembly Instructions	51
Disassembly Process	51
External Module Disassembly Process	52
External Modules Disassembly Flowchart	52
Removing the Battery Pack	53
Removing the SD Dummy Card	54
Removing the Lower Covers	55
Removing the WLAN Module	57
Removing the DIMM Modules	59
Removing the Hard Disk Drive Module	60
Removing the Optical Disk Drive Module	62
Main Unit Disassembly Process	64
Main Unit Disassembly Flowchart	64
Removing the Hinge Covers	65
Removing the Switch Cover	66
Removing the Keyboard	68
Removing the Speaker Module	69
Removing the LCD Module	71
Removing the Upper Cover	76
Removing the Function Board	79
Removing the Finger Print Reader	80
Removing the TouchPad Bracket	82
Removing the RTC Battery	84
Removing the Bluetooth Module	85
Removing the USB Board	87
Removing the Modem Module	88
Removing the Mainboard	90
Removing the RJ-11 Port	91
Removing the Thermal Module	93
Removing the CPU	95
LCD Module Disassembly Process	96
LCD Module Disassembly Flowchart	96
Removing the LCD Bezel	97
Removing the Camera Module	99
Removing the LCD Panel	100
Removing the LCD Brackets and FPC Cable	102
Removing the Antennas	103
Removing the MIC Module	104
LCD Module Reassembly Procedure	105
Replacing the MIC Module	105
Replacing the Antennas	105
Replacing the LCD Panel	108
Replacing the Camera Module	110
Replacing the LCD Bezel	111
Main Module Reassembly Procedure	112
Replacing the CPU	112
Replacing the Thermal Module	113
Replacing the RJ-11 Port	115
Replacing the Mainboard	116
Removing the RTC Battery	118
Replacing the USB Board	118
Replacing the Bluetooth Board	119
Replacing the Modem Module	121
Replacing the Finger Print Reader	124
Replacing the Function Board	126
Replacing the Upper Cover	127
Replacing the LCD Module	130
Replacing the Speaker Module	134
Replacing the Keyboard	135
Replacing the Switch Cover	137
Replacing the Hinge Covers	139
External Module Reassembly Process	140
Replacing the ODD Module	140
Replacing the Hard Disk Drive Module	141
Replacing the DIMM Modules	143
Replacing the WLAN Module	143
Replacing the Lower Covers	145
Replacing the SD Dummy Card	145
Replacing the Battery	146
Troubleshooting	148
Common Problems	148
Power On Issue	149
No Display Issue	150
Random Loss of BIOS Settings	152
LCD Failure	153
Built-In Keyboard Failure	154
Touchpad Failure	155
Internal Speaker Failure	156
Internal Microphone Failure	158
HDD Not Operating Correctly	159
ODD Failure	160
USB Failure (Rightside)	163
Wireless Function Failure	164
Bluetooth Function Failure	165
Easy Button Failure	166
Fingerprint Reader Failure	167
Thermal Unit Failure	168
External Mouse Failure	169
MB CMOS Discharge	170
Other Failures	171
Intermittent Problems	171
Undetermined Problems	171
POST Codes Tables	172
Jumper and Connector Locations	176
Top View	176
Bottom View	177
LS-4921P Function Board	178
LS-4494P Fingerprint Board	179
LS-4495P USB Board	179
Clearing Password Check and BIOS Recovery	179
Clearing Password Check	180
BIOS Recovery by Crisis Disk	181
FRU (Field Replaceable Unit) List	182
Aspire 4935/4935G Exploded Diagrams	183
Main Module	183
Base	184
Aspire 4935/4935G FRU List	185
Screw List	193
Model Definition and Configuration	195
Aspire 4935/4935G Series	195
Test Compatible Components	220
Microsoft® Windows® Vista Environment Test	221
Online Support Information	250

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