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Acer Extensa 4220 TravelMate 4320/4720 and Extensa 4220/4620 Service Guide - Page 84

Removing the LED Indicators Board

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13. Remove the two screws (C) securing the fingerprint board to the bracket. Step 1~2 Size (Quantity) M2 x L3 (2) 14. Detach the fingerprint board. Color Silver Torque 1.6 kgf-cm Removing the LED Indicators Board 1. See "Removing the Battery Pack" on page 51. 2. See "Removing the SD Dummy Card" on page 51. 3. See "Removing the Express Dummy Card" on page 52. 4. See "Removing the Lower Cover" on page 53. 5. See "Removing the Fan Module" on page 60. 6. See "Removing the CPU Heatsink Module" on page 61. 7. See "Removing the CPU" on page 62. 8. See "Removing the Middle Cover" on page 63. 9. See "Removing the Keyboard" on page 64. 10. See "Removing the LCD Module" on page 67. 11. See "Separating the Upper Case from the Lower Case" on page 70. 74 Chapter 3

Section	Page
Table of Contents	7
Features	11
Your Acer Notebook Tour	14
Front View	14
Closed Front View	15
Left View	16
Right View	16
Rear Panel	17
Bottom Panel	17
Indicators	18
Easy-launch Buttons	19
Productivity Keys	20
Touchpad	21
Touchpad Basics	21
Using the Keyboard	23
Lock Keys and Embedded Numeric Keypad	23
Windows Keys	24
Hotkeys	25
Special Keys	26
Acer Empowering Technology	27
Empowering Technology Password	27
Acer eNet Management	28
Acer ePower Management	30
Acer ePresentation Management	32
Acer eDataSecurity Management	33
Acer eLock Management	34
Acer eRecovery Management	35
Acer eSettings Management	36
Windows Mobility Center	37
Using the System Utilities	38
Acer BiopProtect (for selected models)	38
Acer GridVista (dual-display compatible)	39
Launch Manager	40
Norton Internet Security	40
NTI Shadow	41
Hardware Specifications and Configurations	42
BIOS Setup Utility	49
Entering BIOS Setup	49
BIOS Setup Primary Menus	49
BIOS Setup Navigation Keys	49
Information Menu	50
Main Menu	51
Advanced Menu	52
Security Menu	53
Boot Menu	55
Exit Menu	56
Disassembly Requirements	57
General Information	58
Pre-disassembly Instructions	58
Disassembly Process	59
External Module Disassembly Process	60
External Modules Disassembly Flowchart	60
Removing the Battery Pack	61
Removing the SD Dummy Card	61
Removing the Express Dummy Card	62
Removing the Lower Cover	63
Removing the DIMM	63
Removing the WLAN Board Modules	64
Removing the Hard Disk Drive Module	65
Removing the Optical Drive Module	67
Main Unit Disassembly Process	69
Main Unit Disassembly Flowchart	69
Removing the Fan Module	70
Removing the CPU Heatsink Module	71
Removing the CPU	72
Removing the Middle Cover	73
Removing the Keyboard	74
Removing the LCD Module	77
Separating the Upper Case from the Lower Case	80
Removing the Touchpad Board Module	81
Removing the Fingerprint Board	83
Removing the LED Indicators Board	84
Remove the Daughter Board	85
Removing the Mainboard	87
Removing the Modem Board	88
Removing the Bluetooth Board	89
Removing the Speaker Modules	90
LCD Module Disassembly Process	92
LCD Module Disassembly Flowchart	92
Removing the LCD Bezel	93
Removing the Inverter Board	94
Removing the LCD with Brackets	95
Removing the LCD Brackets	97
Removing the LCD Module Hinges	99
Removing the Antennas	100
Removing the Microphone	101
System Check Procedures	104
External CD/DVD-ROM Drive Check	104
Keyboard or Auxiliary Input Device Check	104
Memory Check	104
Power System Check	105
Touchpad Check	106
Power-On Self-Test (POST) Error Message	107
Index of Error Messages	108
Phoenix BIOS Beep Codes	110
Index of Symptom-to-FRU Error Message	114
Intermittent Problems	118
Undetermined Problems	119
System Block Diagram	121
Board Layout	122
Top and Bottom View	122
Travelmate 4720/4320 Exploded Diagram	128
Travelmate 4720/4320	140
Appendix A Model Definition and Configuration	140
Microsoft® Windows® Vista™ Environment Test	144

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