Table Of Contents - LG KT520 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.............................18
2.5 RSSI.......................................................18
2.6 Battery Bar .............................................18
2.7 Sound Pressure Level............................19
2.8 Charging ................................................20
3. TECHNICAL BRIEF ........................21
3.1 Digital Baseband(DBB) & Multimedia
Processor...............................................21
3.2 GAM Hardware Subsystem ...................45
3.3 Audio Part ..............................................57
3.4 GPADC(General Purpose ADC) and
AUTOADC2 ...........................................65
3.5 Charger control ......................................66
3.6 Voltage Regulation.................................72
3.7 RF Technical Description.......................73
4. TROUBLE SHOOTING ...................84
4.1 Power ON Trouble .................................84
4.2 USB Trouble ..........................................85
4.3 SIM Detect Trouble ................................86
4.4 MicroSD card Trouble ............................87
4.5 Keypad, Touch Button and
Touch Screen Trouble ...........................88
4.6 Camera Trouble .....................................91
4.7 Main LCD Trouble..................................94
4.8 Keypad Backlight Trouble ......................96
4.9 Folder ON/OFF Trouble .........................98
4.10 Audio Trouble Shooting .....................100
4.11 Charger Trouble Shooting..................115
4.12 Checking Bluetooth Block ..................118
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Only for training and service purposes

Table Of Contents

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4.14 Procedure to check ............................121
4.15 Checking Common Power Source
Block ..................................................122
4.16 Checking VCXO Block .......................127
4.17 Checking Front End Module Block.....132
4.18 Checking Front End Module Block
input logic...........................................133
4.19 Checking WCDMA Block ...................142
4.20 Checking GSM Block .........................155
5. DOWNLOAD .................................167
5.1 The Purpose of Downloading
Software...............................................167
5.2 Download Environment Setup .............167
5.3 KT520 Download .................................168
5.4 How to KT520 Download .....................172
6. BLOCK DIAGRAM ........................175
7. Circuit Diagram ............................177
8. BGA Pin Map ................................187
9. PCB LAYOUT ................................193
10. Calibration ..................................201
10.1 General Description ...........................201
10.2 XCALMON Environment ....................201
10.3 Calibration Environment.....................202
10.4 Program Operation ............................203
11. EXPLODED VIEW &
REPLACEMENT PART LIST ......209
11.1 EXPLODED VIEW .............................209
11.2 Replacement Parts ............................213
11.3 Accessory ..........................................231
LGE Internal Use Only