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Acer Aspire 1420P Aspire 1420P and 1820PT Service Guide - Page 177

Clearing Password Check and BIOS Recovery, Mainboard CMOS Discharge - factory

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Clearing Password Check and BIOS Recovery This section provides a procedure for clearing the password and BIOS. The Hardware Open Gap on the main board clears the CMOS of all user settings and restores factory defaults. Mainboard CMOS Discharge Discharging the CMOS clears all user settings. 1. Disassemble the notebook and take out the Mainboard. See "Removing the Mainboard" on page 69. 2. Remove the RTC battery. See "Removing the RTC Battery" on page 73. 3. Turn the mainboard over, lift up the DIMM protective cover, and short the G3 pad. 4. Reconnect the RTC battery and reassemble the unit. Chapter 5 167

Section	Page
System Specifications	11
Features	11
System Block Diagram	13
Your Notebook Tour	14
Front View	14
Closed Front View	15
Left View	16
Right View	16
Base View	17
Rear View	18
Indicators	18
TouchPad Basics	19
Using the Keyboard	20
Lock Keys and embedded numeric keypad	20
Windows Keys	21
Hot Keys	22
Special Keys	23
Hardware Specifications and Configurations	24
System Utilities	33
BIOS Setup Utility	33
Navigating the BIOS Utility	33
Information	34
Main	35
Security	36
Boot	39
Exit	40
BIOS Flash Utility	41
DOS Flash Utility	42
WinFlash Utility	43
Remove HDD/BIOS Password Utilities	44
Removing BIOS Passwords:	45
Miscellaneous Utilities	46
Machine Disassembly and Replacement	49
Disassembly Requirements	49
Related Information	49
General Information	49
Pre-disassembly Instructions	49
Disassembly Process	50
External Module Disassembly Process	51
External Modules Disassembly Flowchart	51
Removing the Dummy Card	52
Removing the Battery Pack	52
Removing the SIM Card	53
Removing the Module Cover	54
Removing the Hard Disk Drive Module	55
Removing the DIMM Module	57
Removing the WLAN Board	58
Removing the 3G Module	59
Main Unit Disassembly Process	61
Main Unit Disassembly Flowchart	61
Removing the Keyboard	63
Removing the Hinge Covers	65
Removing the Upper Cover	67
Removing the Button Board	71
Removing the I/O Board	75
Removing the Bluetooth Module	77
Removing the LED Board	78
Removing the CRT Board	81
Removing the Mainboard	83
Removing the Thermal Module	86
Removing the RTC Battery	87
Removing the Speaker Modules	87
Removing the LCD Module	88
LCD Module Disassembly Process	90
LCD Module Disassembly Flowchart	90
Removing the LCD Bezel	92
Removing the Camera Board	95
Removing the Microphone	96
Removing the LCD Panel	96
Removing the LCD Cable	98
Removing the LCD Brackets	101
Removing the Touchscreen Board	102
Removing the Hinge	103
Removing the Antennas	104
LCD Reassembly Procedure	107
Replacing the Antennas	107
Replacing the Hinge	108
Replacing the Touchscreen Board.	109
Replacing the LCD Brackets	110
Replacing the LCD Cable	111
Replacing the LCD Panel	113
Replacing the Microphone.	115
Replacing the Camera Board	116
Replacing the LCD Bezel	117
Main Unit Reassembly Process	120
Replacing the LCD Module	120
Replacing the RTC Battery	122
Replacing the Thermal Module	122
Replacing the Speakers.	123
Replacing the Mainboard	125
Replacing the CRT Board.	127
Replacing the LED Board	128
Replacing the Bluetooth Module	131
Replacing the I/O Board	132
Replacing the Button Board	135
Replacing the Upper Cover	138
Replacing the Hinge Covers	141
Replacing the Keyboard	143
Replacing the 3G Module	144
Replacing the WLAN Module	146
Replacing the DIMM	147
Replacing the Hard Disk Drive	147
Replacing the Module Cover	149
Replacing the SIM Card	151
Replacing the Battery	151
Replacing the Dummy Card	152
Troubleshooting	153
Common Problems	153
Power On Issue	154
No Display Issue	155
Random Loss of BIOS Settings	156
LCD Failure	157
Built-In Keyboard Failure	158
TouchPad Failure	159
Internal Speaker Failure	160
Internal Microphone Failure	161
HDD Not Operating Correctly	162
USB Failure (Right up/down side)	163
Other Failures	163
Intermittent Problems	164
Undetermined Problems	164
Post Codes	165
Jumper and Connector Locations	175
Mainboard Top View	175
Mainboard Bottom View	176
Clearing Password Check and BIOS Recovery	177
Mainboard CMOS Discharge	177
BIOS Recovery by Crisis Disk	178
FRU (Field Replaceable Unit) List	179
Exploded Diagram	179
Fru List	181
Model Definition and Configuration	187
Test Compatible Components	201
MS Compatibility Test Report	204
Online Support Information	209

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