Table Of Contents - LG CT815 Service Manual

1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
2. PERFORMANCE...............................7
2.1 System Overview .....................................7
2.2 Usable environment .................................8
2.3 Radio Performance ..................................9
2.4 Current Consumption.............................13
2.5 RSSI BAR ..............................................14
2.6 Battery BAR ...........................................14
3. TECHNICAL BRIEF ........................15
3.1 GENERAL DESCRIPTION ....................15
3.2 GSM MODE ...........................................17
3.3 UMTS MODE .........................................20
3.4 GPS MODE............................................23
3.5 LO GENERATION and
DISTRIBUTION CIRCUIT ......................24
3.6 OFF-CHIP RF COMPONENTS .............25
3.7 Digital Baseband(DBB/MSM7201A) ......30
3.8 Hardware Architecture ...........................32
3.9 Subsystem(MSM7201A) ........................34
3.10 Power Block .........................................37
3.11 External memory interface ...................42
3.12 H/W Sub System..................................44
3.13 Audio and sound ..................................53
3.14 Camera interface .................................59
3.15 Proximity Sensor..................................65
3.16 Luminance Sensor ...............................66
3.17 Motion Sensor......................................67
3.18 Main Features ......................................68
3.19 Main Component..................................69
4. TROUBLE SHOOTING ...................73
4.1 RF Component.......................................73
4.2 SIGNAL PATH .......................................75
4.3 Checking TCXO Block ...........................79
4.4 Checking Front End Module(FEM)Block81
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Table Of Contents

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4.5 Checking WCDMA Block .......................84
4.6 Checking GSM Block .............................96
4.7 Power ON Troubleshooting..................103
4.8 Charger Troubleshooting .....................105
4.9 USB trouble..........................................108
4.10 Audio trouble......................................111
4.11 3M Camera trouble ............................126
4.12 Main LCD trouble ...............................129
4.13 SIM Detect Troubleshooting ..............132
4.14 Keypad Backlight Troubleshooting ....134
4.15 LINEAR MOTOR................................136
4.16 Proximity Sensor on/off trouble..........138
4.17 Luminance Sensor on/off trouble .......140
4.18 Motion Sensor on/off trouble..............142
5. DOWNLOAD .................................144
5.1 Introduction ..........................................144
5.2 Downloading Procedure.......................144
6. BLOCK DIAGRAM ........................156
7. CIRCUIT DIAGRAM ......................167
8. BGA IC PIN CHECK......................175
9. PCB LAYOUT ................................179
10. CALIBRATION & RF AUTO TEST
(HOT KIMCHI) .............................183
10.1 Usage of Hot-Kimchi ..........................183
11. TEST MODE ................................186
12. EXPLODED VIEW &
REPLACEMENT PART LIST ......193
12.1 EXPLODED VIEW .............................193
12.2 Replacement Parts
<Mechanic component>.....................195
<Main component> ............................198
12.3 Accessory ..........................................221
LGE Internal Use Only