Table Of Contents - LG GM750 Service Manual

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. .................................................................22
3. TECHNICAL BRIEF ......................................... 29
3.1 GENERAL DESCRIPTION .............................................29
3.2 GSM MODE ...............................................................31
3.3 UMTS MODE .............................................................35
3.4 GPS MODE ...............................................................38
3.5 LO GENERATION and DISTRIBUTION CIRCUIT ..............39
3.6 OFF-CHIP RF COMPONENTS ......................................40
3.7 Digital Baseband(DBB/MSM7200A) ............................44
3.2 Hardware Architecture ...............................................45
3.9 Subsystem(MSM7200A) ............................................47
3.10 Power Block ............................................................50
3.11 External memory interface .......................................55
3.12 H/W Sub System .....................................................57
3.13 Audio and sound .....................................................66
3.14 Camera interface .....................................................73
3.15 Proximity Sensor .....................................................80
3.16 Luminance Sensor ...................................................81
3.17 Motion Sensor .........................................................82
3.18 Main Features .........................................................83
4. TROUBLE SHOOTING ..................................... 88
4.1 RF Component ..........................................................88
4.2 SIGNAL PATH ............................................................91
4.3 Checking TCXO Block ................................................94
4.4 Checking Front End Module (FEM) Block .....................96
4.5 Checking WCDMA Block ............................................99
4.6 Checking GSM Block ...............................................111
4.7 Power ON Troubleshooting .......................................117
4.8 Charger Troubleshooting ..........................................119
4.9 USB trouble .............................................................122
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Table Of Contents

4.10. Audio trouble ........................................................124
4.11 5M Camera trouble ...............................................137
4. 12 VGA Camera trouble .............................................140
4.13 Main LCD trouble ..................................................144
4.14 SIM Detect Troubleshooting ....................................146
4.15 Keypad Backlight Troubleshooting ...........................148
4.16 LINEAR MOTOR .....................................................149
4.17 Proximity Sensor on/off trouble ...............................150
4.18 Luminance Sensor on/off trouble ............................152
4.19 Motion Sensor on/off trouble ..................................154
5. Download ................................................... 156
6. Block Diagram ........................................... 172
7. CIRCUIT DIAGRAM ...................................... 185
8. BGA Pin Map .............................................. 195
9. PCB LAYOUT ............................................... 203
10. Calibration ................................................ 211
10.1. Calibration & RF Auto Test Program (Tachyon) .........211
10.2 How to use Tachyon ...............................................214
11. Test Mode ................................................. 217
12. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................ 227
12.1 EXPLODED VIEW .....................................................27
12.2 Replacement Parts ................................................229
12.3 Accessory ............................................................. 257
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