Table Of Contents - LG CU400 Service Manual

1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
2. PERFORMANCE...............................7
2.1 Default Packaging Accessories ...............7
2.2 System Specification................................7
2.3 Using Condition (Accessory)....................7
2.4 Radio Performance ..................................8
2.5 Current Consumption.............................11
2.6 Operation Time ......................................11
2.7 RSSI Bar ................................................11
2.8 Battery Bar .............................................12
2.9 BACKUP BATTERY : Over 50 hours ....12
2.10 Sound Level .........................................12
3. RF TECHNICAL BRIEF...................13
3.1 MSM6280 (Block Diagram)....................13
3.2 MSM6280 (GPIO MAP) .........................14
3.3 RF Block Diagram..................................16
3.4 Memory ..................................................17
3.5 Camera & LCD Interface........................18
3.6 Interface USB,UART,SIM,JTAG ............19
3.7 Power Block Diagram ............................20
3.8 Peripheral...............................................21
3.9 Audio Block Diagram .............................22
3.10 Digital Baseband(DBB/MSM6280).......23
3.11 Subsystem(MSM6280) ........................26
3.12 Power Block .........................................33
3.13 External memory interface ...................38
3.14 H/W Sub System..................................39
3.15 Main Features ......................................57
4. TROUBLE SHOOTING ...................62
4.1 RF Component.......................................62
4.2 Checking VCXO Block ...........................66
4.3 Checking Ant. SW Module Block ...........68
4.4 Checking UMTS Block ...........................71
4.5 Checking GSM Block .............................78
4.6 Power ON Troubleshooting....................86
4.7 Charger Troubleshooting .......................88
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Table Of Contents

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4.8 USB Troubleshooting.............................91
4.9 SIM Detect Troubleshooting ..................93
4.10 Camera Troubleshooting .....................94
4.11 Keypad Backlight Troubleshooting ......95
4.12 Folder ON/OFF Troubleshooting .........96
4.13 Main LCD Troubleshooting ..................97
4.14 Receiver Path ......................................98
4.15 Headset path......................................100
4.16 Speaker phone path...........................102
4.17 Main microphone ...............................104
4.18 Headset microphone..........................106
4.19 Vibrator ..............................................108
5. DOWNLOAD .................................109
5.1 Introduction ..........................................109
5.2 Downloading Procedure.......................109
5.3 Troubleshooting download errors ........123
5.4 Caution.................................................130
6. BLOCK DIAGRAM ........................131
6.1 CU400 Block Diagram .........................131
7. Circuit Diagram ............................133
8. pcb layout .....................................140
9. Calibration & RF Auto
Test Program ................................145
9.1 Configuration of HOT KIMCHI .............145
9.2 How to use HOT KIMCHI.....................149
9.3 Example for using HOT KIMCHI ..........150
10. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 153
10.1 EXPLODED VIEW ............................ 153
10.2 Replacement Parts
<Mechanic component>.................... 155
<Main component> ........................... 158
10.3 Accessory ......................................... 174
LGE Internal Use Only