Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 8

Table of Contents Removing the LED Board 49 Removing the Fingerprint and Touchpad Boards 50 Removing the Card Reader Board 52 Removing the Bluetooth Board 53 Removing the System Board 54 Removing the Modem Board 55 Removing the Speakers 55 LCD Module Disassembly 57 LCD Module Disassembly Flowchart 57 Removing the LCD Bezel 58 Removing the Inverter Board 59 Removing the LCD Module Hinges 60 Removing the LCD Panel 60 Removing the LCD-CCD Cable 61 Removing the LCD Panel Brackets 62 Removing the Internal Microphone and the CCD Board 63 Removing the WLAN Antennas 64 Hardware Diagnostic Procedure 65 System Troubleshooting 65 Chapter 4 65 System Check Procedures 66 External Diskette Drive Check 66 External CD-ROM Drive Check 66 Keyboard or Auxiliary Input Device Check 66 Memory Check 67 Power System Check 67 Touchpad Check 68 POST Error Indicators 69 POST Error Message 69 POST Beep Codes 72 Index of Symptom-to-FRU Error Message 77 Intermittent Problems 80 Undetermined Problems 81 Online Support Information 82 System Block Diagram 83 System Block Diagram and Board Layout 83 Chapter 5 83 83 System Board Layout 84 Top View 84 Bottom View 85 System Switch 86 FRU (Field Replaceable Unit) List 87 Chapter 6 87 Aspire 5910 Exploded Diagram 88 TravelMate 4520 FRU List 89 TravelMate 4520 Series Model Configurations 107 Appendix A 107 VIII