Acer Extensa 4220 TravelMate 4320/4720 and Extensa 4220/4620 Service Guide - Page 8

Chapter 3 Machine Disassembly and Replacement 47 Disassembly Requirements 47 General Information 48 Pre-disassembly Instructions 48 Disassembly Process 49 External Module Disassembly Process 50 External Modules Disassembly Flowchart 50 Removing the Battery Pack 51 Removing the SD Dummy Card 51 Removing the Express Dummy Card 52 Removing the Lower Cover 53 Removing the DIMM 53 Removing the WLAN Board Modules 54 Removing the Hard Disk Drive Module 55 Removing the Optical Drive Module 57 Main Unit Disassembly Process 59 Main Unit Disassembly Flowchart 59 Removing the Fan Module 60 Removing the CPU Heatsink Module 61 Removing the CPU 62 Removing the Middle Cover 63 Removing the Keyboard 64 Removing the LCD Module 67 Separating the Upper Case from the Lower Case 70 Removing the Touchpad Board Module 71 Removing the Fingerprint Board 73 Removing the LED Indicators Board 74 Remove the Daughter Board 75 Removing the Mainboard 77 Removing the Modem Board 78 Removing the Bluetooth Board 79 Removing the Speaker Modules 80 LCD Module Disassembly Process 82 LCD Module Disassembly Flowchart 82 Removing the LCD Bezel 83 Removing the Inverter Board 84 Removing the LCD with Brackets 85 Removing the LCD Brackets 87 Removing the LCD Module Hinges 89 Removing the Antennas 90 Removing the Microphone 91 Chapter 4 Troubleshooting 93 System Check Procedures 94 External CD/DVD-ROM Drive Check 94 Keyboard or Auxiliary Input Device Check 94 Memory Check 94 Power System Check 95 Touchpad Check 96 Power-On Self-Test (POST) Error Message 97 Index of Error Messages 98 Phoenix BIOS Beep Codes 100 Index of Symptom-to-FRU Error Message 104 Intermittent Problems 108 Undetermined Problems 109 viii