Table Of Contents - LG -A270 Service Manual

1. INTRODUCTION ..................................................................... 3
1.1 Purpose ........................................................................................................3
1. Regulatory Information .........................................................................3
1.3 Abbreviations.............................................................................................5
2. SYSTEM SPECIFICATION ....................................................... 7
.1 H/W Features ..............................................................................................7
. Technical Specification ...........................................................................9
3. TECHNICAL BRIEF ................................................................ 14
3.1 Digital Main Processor ......................................................................... 14
3. Power Management ............................................................................ 17
3.3 FEM with integrated Power Amplifier Module
(SKY77550, U300) .................................................................................. 
3.4 Crystal(6 MHz, X100) ......................................................................... 4
3.5 RFSYS of MT651 (U100) .................................................................... 5
3.6 MEMORY(FM5Q3, U101) ............................................................... 7
3.7 SIM Card Interface ................................................................................. 9
3.8 Display Interface .................................................................................... 30
3.9 Battery Charger Interface ................................................................... 3
3.10 Keypad Interface ................................................................................. 33
3.11 Audio Front-End .................................................................................. 35
3.1 KEY BACLKLIGHT LED Interface .................................................... 38
3.13 Vibrator Interface ................................................................................ 39
3.14 Torch LED Interface ............................................................................ 40
3.15 Micro SD Card Interface ................................................................... 41
4. TROUBLE SHOOTING .......................................................... 42
4.1 RF Component ....................................................................................... 4
4. RX Trouble ................................................................................................ 43
4.3 TX Trouble ................................................................................................. 47
4.4 FM Radio Trouble (Wired 3.5 phi/wireless) ................................. 51
4.5 Power On Trouble .................................................................................. 53
4.6 Charging Trouble ................................................................................... 56
4.7 Vibrator Trouble ..................................................................................... 58
4.8 LCD Trouble ............................................................................................. 60
4.9 Speaker Trouble ..................................................................................... 6
LGE Internal Use Only

Table Of Contents

4.10 Earphone Trouble ............................................................................... 65
4.11 Microphone Trouble .......................................................................... 68
4.1 SIM Card Interface Trouble .............................................................. 70
4.13 KEY backlight Trouble ...................................................................... 7
4.14 Torch Light Trouble ........................................................................... 74
4.15 Micro SD Trouble ................................................................................ 76
5. DOWNLOAD ......................................................................... 78
6. BLOCK DIAGRAM ................................................................. 91
7. CIRCUIT DIAGRAM .............................................................. 92
8. BGA PIN MAP ...................................................................... 96
9. PCB LAYOUT ......................................................................... 97
10. ENGINEERING MODE ........................................................ 99
11.AUTO CALIBRATION ......................................................... 100
11.1 Overview ..............................................................................................100
11. Directory structure of Tachyon ....................................................100
11.3 Description of Folder & File...........................................................101
11.4 How to use Tachyon .........................................................................10
11.5 Target Power .......................................................................................105
12. EXPLODED VIEW & REPLACEMENT PART LIST ............. 106
1.1 EXPLODED VIEW ................................................................................106
1. Replacement Parts ...........................................................................107
1.3 Accessory .............................................................................................119
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