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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
2.4HW Features.....................................................................................10
2.5SW Features .....................................................................................12
2.6 HW SPEC...........................................................................................14
2.7 GD880 Figures ...............................................................................20
3. TECHNICAL BRIEF............................................21
3.1 Digital Baseband(DBB/MSM7227).........................................21
3.2 Hardware Architecture ..............................................................22
3.3 Sub system(MSM7227)...............................................................25
3.4 Power Block.....................................................................................34
3.5 External memory interface.......................................................39
3.6 H/W Sub system............................................................................41
3.7 Audio and sound..........................................................................52
3.8 Camera / LCD..................................................................................58
3.9 Proximity Sensor...........................................................................65
3.10 Luminance Sensor.....................................................................66
3.11 Motion Sensor.............................................................................67
3.12 Vibrators.........................................................................................68
3.13 GSM MODE...................................................................................70
3.14 UMTS MODE.................................................................................72
3.15 GPS RECEIVER ..............................................................................75
3.16 LO GENERATION and DISTRIBUTION CIRCUIT ................75
3.17 OFF-CHIP RF COMPONENTS..................................................76
3.18 LG GD880 Main Features.........................................................80
3.19 GD880 Main Component .......................................................81
4. TROUBLE SHOOTING ......................................86
4.1 RF Component...............................................................................86
4.2 Signal Path.......................................................................................88
4.3 Checking TCXO Block..................................................................92
4.4 Checking FEM Block....................................................................93
4.5 Checking WCDMA Block............................................................96
4.6 Checking GSM Block ................................................................106
4.7 GPS/WIFI/BT/FM Radio RF components .......................... 113
4.8 GPS/WIFI/BT/FM Radio SIGNAL PATH................................ 115
4.9 GPS/WIFI/BT/FM Radio TROUBLE SHOOTING................ 116
4.10 Power ON Troubleshooting ................................................ 122
4.11 Charger Troubleshooting .................................................... 126
4.12 USB trouble................................................................................ 130
4.13 Audio trouble ........................................................................... 133
4. 14 5M Camera trouble ............................................................... 145
4. 15 VGA Camera trouble............................................................. 148
4. 16 Main LCD trouble................................................................... 150
4.17 SIM Detect Troubleshooting .............................................. 153
4.18 Side Key Troubleshooting.................................................... 155
4.19 LINEAR MOTOR ........................................................................ 157
4.20 Proximity Sensor on/off trouble ....................................... 158
4.21 Luminance Sensor on/off trouble.................................... 160
4.22 Motion Sensor on/off trouble............................................ 162
5. DOWNLOAD...................................................164
6. BLOCK DIAGRAM...........................................177
7. CIRCUIT DIAGRAM ........................................185
8. BGA PIN MAP .................................................195
9. PCB LAYOUT...................................................201
10. RF CALIBRATION .........................................205
10.1 Introduction.............................................................................. 206
10.2 Terminology .............................................................................. 206
10.3 Tachyon Main UI ...................................................................... 206
11. EXPLODED VIEW & REPLACEMENT
PART LIST ....................................................215
11.1 EXPLODED VIEW...................................................................... 215
11.2 Replacement Parts.................................................................. 219
11.3 Accessory ................................................................................... 244
