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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION..................................................................5
1.1 Purpose............................................................................................... 5
1.2 Regulatory Information ............................................................... 5
1.3 Abbreviations................................................................................... 7
2. PERFORMANCE...................................................................9
2.1 Product Name.................................................................................. 9
2.2 Supporting Standard.................................................................... 9
2.3 Main Parts : GSM Solution........................................................... 9
2.4 HW Features....................................................................................10
2.5 SW Features ....................................................................................12
2.6 HW SPEC. .........................................................................................15
2.7 LG-E900 Figures.............................................................................21
3. TECHNICAL BRIEF.............................................................22
3.1 RF GENERAL DESCRIPTION.......................................................22
3.2 GSM MODE......................................................................................24
3.3 UMTS MODEE.................................................................................28
3.4 GPS MODE.......................................................................................31
3.5 OFF-CHIP RF COMPONENTS ....................................................32
3.6 Digital Baseband(DBB/QSD8650)..........................................36
3.7 Hardware Architecture...............................................................37
3.8 Microprocessor Subsytem(QSD8650)..................................40
3.9 Power Block.....................................................................................41
3.10 H/W Sub System.........................................................................46
3.11 Audio and sound........................................................................50
3.12 Display............................................................................................54
3.13 Proximity Sensor ........................................................................55
3.14 Light Sensor .................................................................................55
3.15 Motion Sensor (Three-axis-accelerometer).....................56
3.16 Compass Sensor.........................................................................56
3.17 LG –E900 Main Features..........................................................58
3.18 Main Component.......................................................................59
4. TROUBLE SHOOTING .......................................................62
4.1 RF Component...............................................................................62
4.2 SIGNAL PATH ..................................................................................64
4.3 Checking TCXO Block..................................................................68
4.4 Checking FEM Block....................................................................70
4.5 Checking WCDMA Block............................................................73
4.6 Checking GSM Block ...................................................................84
4. 7 GPS/WIFI/BT/FM Radio RF components ............................92
4.8 GPS/WIFI/BT Signal path ...........................................................94
4. 9 GPS/WIFI/BT Trouble shooting...............................................96
4.10 Power ON Troubleshooting................................................ 105
4.11 Charger Troubleshooting .................................................... 108
4.12 USB trouble................................................................................ 111
4.13 Audio trouble ........................................................................... 113
4.14 5M Camera trouble ................................................................ 123
4.15 Main LCD trouble.................................................................... 125
4.16 SIM Detect Troubleshooting .............................................. 127
4.17 Key Troubleshooting ............................................................. 129
4.18 VIBRATOR.................................................................................... 130
4.19 Proximity Sensor on/off trouble ....................................... 131
4.20 Luminance Sensor on/off trouble....................................133
4.21 Motion Sensor on/off trouble............................................ 135
5. DOWNLOAD................................................................... 137
6. BLOCK DIAGRAM........................................................... 150
7. CIRCUIT DIAGRAM ........................................................ 159
8. BGA Pin Map.................................................................. 169
9. PCB LAYOUT................................................................... 173
10. RF CALIBRATION ......................................................... 179
10.1 Configuration of Tachyon.................................................... 179
10.2 How to use Tachyon............................................................... 181
11. EXPLODED VIEW & REPLACEMENT PART LIST ......... 185
11.1 EXPLODED VIEW...................................................................... 185
11.2 Replacement Parts.................................................................. 187
11.3 Accessory ................................................................................... 209
