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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......................................8

2.4 Current Consumption.................................14

2.5 RSSI BAR ..................................................14

2.6 Battery BAR ...............................................15

2.7 Sound Pressure Level ...............................16

2.8 Charging ....................................................16

3. TECHNICAL BRIEF............................17

3.1 General Description ...................................17

3.2 GSM Mode.................................................19

3.3 UMTS Mode...............................................23

3.4 LO generation and distribution circuits ......25

3.5 Off-chip RF Components ...........................25

3.6 Digital Baseband(DBB/MSM7200) ............35

3.7 Hardware Architecture ...............................37

3.8. Subsystem(MSM7200) .............................39

3.9. Power Block..............................................42

3.10. External memory interface......................47

3.11. H/W Sub System ....................................49

3.12. Main Features.........................................76

4. TROUBLE SHOOTING.......................82

4.1 RF Component ..........................................82

4.2 SIGNAL PATH_UMTS RF .........................85

4.3 SIGNAL PATH_GSM RF ...........................86

4.4 Checking VCTCXO Block ..........................87

4.5 Checking Front-End Module Block ............89

4.6 Checking UMTS Block...............................91

4.7 Checking GSM Block.................................96

4.8 Checking Bluetooth Block........................102

4.9 Checking WLAN Block.............................104

4.10 Power ON Troubleshooting ...................108

4.11 Charger Troubleshooting .......................110

4.12 USB Troubleshooting.............................113

4.13 SIM Detect Troubleshooting ..................115

4.14 Camera Troubleshooting .......................117

4.15 Keypad Backlight Troubleshooting ........120

4.16 Main LCD Troubleshooting ....................121

4.17 Receiver Path ........................................122

4.18 Headset path .........................................124

4.19 Speaker phone path ..............................126

4.20 Main microphone ...................................128

4.21 Headset microphone..............................130

4.22 Vibrator ..................................................132

5. DOWNLOAD.....................................133

5.1 KS20 DOWNLOAD..................................133

6. BLOCK DIAGRAM ...........................146

6.1 GSM & UMTS RF Block ..........................146

6.2 Interface Diagram ....................................148

7. Circuit Diagram................................153

8. BGA IC PIN MAP..............................163

8. PCB LAYOUT ...................................169

9. Calibration & RF Auto Test

Program (Hot Kimchi) .....................177

9.1 Configuration of HOT KIMCHI .................177

9.2 How to use HOT KIMCHI.........................180

10. Phone Test Mode _ 3G smart

Phone KS20 ...................................182

11. EXPLODED VIEW & REPLACEMENT

PART LIST ..................................... 189

11.1 EXPLODED VIEW ................................ 189

11.2 Replacement Parts

<Mechanic component> ....................... 191

<Main component> ............................... 193

11.3 Accessory ............................................. 209

Table Of Contents

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Only for training and service purposes

LG KS20 - Page 172

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