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Copyright © 2011 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. PERFORMANCE ...................................................................... 7
2.1 Product Name ............................................................................................7
2.2 Supporting Standard ..............................................................................7
2.3 Main Parts : GSM Solution .....................................................................7
2.4 HW Features ...............................................................................................8
2.5 SW Features ............................................................................................. 10
2.6 HW SPEC. ................................................................................................. 13
3. TECHNICAL BRIEF ................................................................ 24
3.1 GENERAL DESCRIPTION ...................................................................... 24
3.2 GSM mode ............................................................................................... 26
3.3 UMTS mode ............................................................................................. 29
3.4 GPS RECEIVER.......................................................................................... 31
3.5 OFF-CHIP RF COMPONENTS ............................................................. 32
3.6 Digital Baseband(MSM8255) ............................................................ 39
3.7 Hardware Architecture ........................................................................ 40
3.8 Subsystem (MSM8255) ....................................................................... 42
3.9 Power Block ............................................................................................. 48
3.10 External memory interface ............................................................. 58
3.11 H/W Sub System .................................................................................. 59
3.12 Audio and sound ................................................................................ 65
3.13 Display ..................................................................................................... 73
3.14 Vibrators (Q-Coin Motor) ................................................................. 76
3.15 Compass Sensor .................................................................................. 78
3.16 Motion Sensor ...................................................................................... 79
3.17 Main Features ....................................................................................... 80
4. TROUBLE SHOOTING .......................................................... 81
4.1 RF Component ....................................................................................... 81
4.2 SIGNAL PATH ........................................................................................... 82
4.3 Checking XO Block ................................................................................ 84
4.4 Checking Dual Rx module (FEM + Dual Duplexer) Block ...... 87
4.5 Checking WCDMA Block .................................................................... 90
4.6 Checking GSM Block ..........................................................................100
4.7 WIFI/BT/FM RF Trouble shooting ..................................................110
4.8 GPS/WIFI/BT RF components .........................................................117
4.9 Power ON Trouble shooting ............................................................121
4.10 Charging Trouble shooting ...........................................................126
4.11 SIM Detect Trouble shooting .......................................................130
4.12 Motion Sensor on/off Trouble Shooting .................................131
4.13 Compass Sensor on/off trouble shooting ..............................133
4.14 Camera troubleshooting ...............................................................135
4.15 Main LCD trouble ..............................................................................138
4.16 Proximity Sensor on/off trouble .................................................140
4.17 Touch trouble .....................................................................................142
4.18 Audio trouble .....................................................................................144
5. DOWNLOAD .......................................................................157
6. BLOCK DIAGRAM ............................................................... 176
7. CIRCUIT DIAGRAM ............................................................180
8. BGA PIN MAP
.................................................................... 193
9. PCB LAYOUT ....................................................................... 207
10. CALIBRATION ...................................................................216
10.1 General Description .........................................................................216
10.2 Requirement .......................................................................................216
10.3 Setup for RF calibration ..................................................................217
10.4 Tachyon Software Installation .....................................................217
10.5 Tachyon Usage ...................................................................................218
10.6 Overview of RF Calibration ...........................................................223
11. HIDDEN MENU .................................................................227
12. EXPLODED VIEW & REPLACEMENT PART LIST ............. 244
14.1 EXPLODED VIEW ................................................................................244
14.2 Replacement Parts ...........................................................................245
14.3 Accessory .............................................................................................273
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