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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
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. TECHNnICAL BRIEF....................................... 19
3.1 GENERAL DESCRIPTION.............................................19
3.2 GSM MODE...............................................................21
3.3 UMTS MODE.............................................................23
3.4 GPS RECEIVER ..........................................................26
3.5 LO GENERATION and DISTRIBUTION CIRCUIT ..............27
3.6 OFF-CHIP RF COMPONENTS......................................28
3.7 Digital Baseband(DBB/MSM7227) ..............................34
3.8 Hardware Architecture ...............................................35
3.9 Subsystem (MSM7227) .............................................39
3.10 Power Block............................................................42
3.11 External memory interface .......................................48
3.12 H/W Sub System .....................................................50
3.13. Audio and sound.....................................................58
3.14 Display ...................................................................65
3.15 Motion Sensor.........................................................67
3.16 Vibrators .................................................................68
3.17 Compass Sensor .....................................................69
3.18 Main Features.........................................................70
4. Trouble Shooting.......................................... 78
4.1 RF Component ..........................................................78
4.2 SIGNAL PATH ............................................................80
4.3 Checking TCXO Block ................................................84
4.4 Checking GSM TX Module(GSM PAM+FEM) BLOCK.....86
4.5 Checking WCDMA Block ............................................89
4.6 Checking GSM BLOCK...............................................99
4.7 GPS/WIFI/BT RF COMPONENTS................................104
4.8 GPS/WIFI/BT Trouble shooting ..................................106
4.9 Power ON Troubleshooting .......................................109
4.10 Charger Troubleshooting ........................................113
4.11 USB trouble...........................................................116
4.12 Audio trouble.........................................................119
4.13 3M AF Camera trouble...........................................129
4.14 Main LCD trouble ..................................................132
4.15 SIM Detect Troubleshooting....................................134
4.16 Side Key Troubleshooting .......................................136
4.17 VIBRATOR .............................................................138
4.18 Motion Sensor on/off trouble ..................................140
4.19 Compass Sensor on/off trouble ..............................142
5. Download ................................................... 144
6. Block diagram............................................157
7. Circuit Diagram..........................................165
8. BGA Pin Map ..............................................177
9. PCB Layout................................................. 181
10. Calibration & RF Auto Test Program
(Tachyon).................................................. 191
12. Exploded view & Replacement part list .207
12.1 Exploded view .......................................................207
12.2 Replacement Parts ................................................209
12.3 Accessory .............................................................235
