Acer Aspire M1420 Technical Information Seite 177
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Chapter 5 167
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.
- Aspire 1820PT/1420P Series 1
- Service Guide 1
- Revision History 2
- Copyright 3
- Disclaimer 3
- Conventions 4
- Table of Contents 10
- System Specifications 11
- System Block Diagram 13
- Your Notebook Tour 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
- Windows Keys 21
- Hot Keys 22
- Special Keys 23
- 22 Chapter 1 32
- System Utilities 33
- Information 34
- Security 36
- Setting a Password 37
- Removing a Password 37
- Changing a Password 38
- BIOS Flash Utility 41
- DOS Flash Utility 42
- WinFlash Utility 43
- Removing BIOS Passwords: 45
- Miscellaneous Utilities 46
- Using the LAN MAC Utility 47
- 38 Chapter 2 48
- Disassembly Requirements 49
- General Information 49
- Chapter 3 49
- Disassembly Process 50
- Removing the Dummy Card 52
- Removing the Battery Pack 52
- Removing the SIM Card 53
- Removing the Module Cover 54
- 46 Chapter 3 56
- Removing the DIMM Module 57
- Removing the WLAN Board 58
- Removing the 3G Module 59
- 50 Chapter 3 60
- 4. Remove the one (1) screw 60
- 5. Remove the 3G module 60
- Main Unit Disassembly Process 61
- Removing the Keyboard 63
- 54 Chapter 3 64
- 4. Unlock the FPC 64
- Removing the Hinge Covers 65
- 56 Chapter 3 66
- 4. Remove the hinge cap 66
- 5. Remove the hinge bezel 66
- Removing the Upper Cover 67
- Chapter 3 59 69
- 8. Pry the front side open 69
- 9. Pry the left side open 69
- 60 Chapter 3 70
- Removing the Button Board 71
- 62 Chapter 3 72
- Chapter 3 63 73
- 64 Chapter 3 74
- 12. Remove the button board 74
- Button Board M2*3 2 74
- Removing the I/O Board 75
- Removing the Bluetooth Module 77
- Removing the LED Board 78
- Chapter 3 69 79
- 5. Remove the LED cable 79
- 70 Chapter 3 80
- 6. Remove the two (2) screws 80
- 7. Remove the LED board 80
- LED Board M2*4 2 80
- Removing the CRT Board 81
- 72 Chapter 3 82
- 5. Turn the CRT board over 82
- 6. Remove the CRT cable 82
- Removing the Mainboard 83
- Chapter 3 75 85
- 12. Remove the CRT cable 85
- Removing the Thermal Module 86
- Removing the RTC Battery 87
- Removing the Speaker Modules 87
- Removing the LCD Module 88
- Chapter 3 79 89
- 5. Remove the LCD module 89
- LCD Module M2*5 5 89
- Removing the LCD Bezel 92
- 84 Chapter 3 94
- Removing the Camera Board 95
- Removing the Microphone 96
- Removing the LCD Panel 96
- Removing the LCD Cable 98
- Chapter 3 89 99
- 90 Chapter 3 100
- Removing the LCD Brackets 101
- Removing the Hinge 103
- Removing the Antennas 104
- Chapter 3 95 105
- 96 Chapter 3 106
- LCD Reassembly Procedure 107
- Replacing the Hinge 108
- Chapter 3 99 109
- Hinge M2*3 3 109
- Replacing the LCD Brackets 110
- Replacing the LCD Cable 111
- 102 Chapter 3 112
- Replacing the LCD Panel 113
- Replacing the Microphone 115
- Replacing the Camera Board 116
- Replacing the LCD Bezel 117
- Chapter 3 109 119
- 7. Insert the stylus 119
- Main Unit Reassembly Process 120
- Chapter 3 111 121
- 3. Turn the LCD module 121
- Replacing the RTC Battery 122
- Replacing the Thermal Module 122
- Replacing the Speakers 123
- 114 Chapter 3 124
- Speaker M2*3 2 124
- Replacing the Mainboard 125
- 116 Chapter 3 126
- 5. Connect the LCD connector 126
- Replacing the CRT Board 127
- Replacing the LED Board 128
- 120 Chapter 3 130
- Chapter 3 121 131
- Replacing the I/O Board 132
- 124 Chapter 3 134
- Replacing the Button Board 135
- 126 Chapter 3 136
- Chapter 3 127 137
- Replacing the Upper Cover 138
- Chapter 3 129 139
- Replacing the Hinge Covers 141
- 132 Chapter 3 142
- 2. Replace the hinge cap 142
- Hinge Covers M2*3 3 142
- Replacing the Keyboard 143
- Replacing the 3G Module 144
- Chapter 3 135 145
- 2. Replace the one (1) screw 145
- 3G Module M2*3 1 145
- Replacing the WLAN Module 146
- Replacing the DIMM 147
- Replacing the Hard Disk Drive 147
- 138 Chapter 3 148
- 3. Adhere the black tape 148
- 4. Replace the HDD FPC 148
- Replacing the Module Cover 149
- 140 Chapter 3 150
- Replacing the SIM Card 151
- Replacing the Battery 151
- Replacing the Dummy Card 152
- Troubleshooting 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
- Other Failures 163
- Intermittent Problems 164
- Undetermined Problems 164
- Post Codes 165
- Chapter 5 175
- Mainboard Bottom View 176
- Mainboard CMOS Discharge 177
- BIOS Recovery by Crisis Disk 178
- Exploded Diagram 179
- Chapter 6 179
- Fru List 181
- Appendix A 189
- 192 Appendix A 202
- Test Compatible Components 203
- MS Compatibility Test Report 206
- Appendix B 197 207
- 198 Appendix B 208
- Appendix B 199 209
- 200 Appendix B 210
- Online Support Information 211
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