LG LG-A270 - Table of Contents

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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION ..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information .........................................................................3
1.3 Abbreviations.............................................................................................5
2. SYSTEM SPECIFICATION ....................................................... 7
2.1 H/W Features ..............................................................................................7
2.2 Technical Specication ...........................................................................9
3. TECHNICAL BRIEF ................................................................ 14
3.1 Digital Main Processor ......................................................................... 14
3.2 Power Management ............................................................................ 17
3.3 FEM with integrated Power Amplier Module
(SKY77550, U300) .................................................................................. 22
3.4 Crystal(26 MHz, X100) ......................................................................... 24
3.5 RFSYS of MT6251 (U100) .................................................................... 25
3.6 MEMORY(FM25Q32, U101) ............................................................... 27
3.7 SIM Card Interface ................................................................................. 29
3.8 Display Interface .................................................................................... 30
3.9 Battery Charger Interface ................................................................... 32
3.10 Keypad Interface ................................................................................. 33
3.11 Audio Front-End .................................................................................. 35
3.12 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 ....................................................................................... 42
4.2 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 ..................................................................................... 62
4.10 Earphone Trouble ............................................................................... 65
4.11 Microphone Trouble .......................................................................... 68
4.12 SIM Card Interface Trouble .............................................................. 70
4.13 KEY backlight Trouble ...................................................................... 72
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
11.2 Directory structure of Tachyon ....................................................100
11.3 Description of Folder & File...........................................................101
11.4 How to use Tachyon .........................................................................102
11.5 Target Power .......................................................................................105
12. EXPLODED VIEW & REPLACEMENT PART LIST .............106
12.1 EXPLODED VIEW ................................................................................106
12.2 Replacement Parts ...........................................................................107
12.3 Accessory .............................................................................................119