Service Manuals, User Guides, Schematic Diagrams or docs for : LG Mobile Phone LG KS20 LG KS20
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Table Of Contents
1. INTRODUCTION.................................. 5 4.13 SIM Detect Troubleshooting ..................115
1.1 Purpose ...................................................... 5 4.14 Camera Troubleshooting .......................117
1.2 Regulatory Information ............................... 5 4.15 Keypad Backlight Troubleshooting ........120
4.16 Main LCD Troubleshooting ....................121
2. PERFORMANCE ..................................7 4.17 Receiver Path ........................................122
4.18 Headset path .........................................124
2.1 System Overview.........................................7
4.19 Speaker phone path ..............................126
2.2 Usable environment.....................................8
4.20 Main microphone ...................................128
2.3 Radio Performance......................................8
4.21 Headset microphone..............................130
2.4 Current Consumption.................................14
4.22 Vibrator ..................................................132
2.5 RSSI BAR ..................................................14
2.6 Battery BAR ...............................................15
5. DOWNLOAD.....................................133
2.7 Sound Pressure Level ...............................16
2.8 Charging ....................................................16 5.1 KS20 DOWNLOAD..................................133
3. TECHNICAL BRIEF............................17 6. BLOCK DIAGRAM ...........................146
3.1 General Description ...................................17 6.1 GSM & UMTS RF Block ..........................146
3.2 GSM Mode.................................................19 6.2 Interface Diagram ....................................148
3.3 UMTS Mode...............................................23
3.4 LO generation and distribution circuits ......25
7. Circuit Diagram................................153
3.5 Off-chip RF Components ...........................25
3.6 Digital Baseband(DBB/MSM7200) ............35 8. BGA IC PIN MAP..............................163
3.7 Hardware Architecture ...............................37
3.8. Subsystem(MSM7200) .............................39 8. PCB LAYOUT ...................................169
3.9. Power Block..............................................42
3.10. External memory interface......................47 9. Calibration & RF Auto Test
3.11. H/W Sub System ....................................49 Program (Hot Kimchi) .....................177
3.12. Main Features.........................................76 9.1 Configuration of HOT KIMCHI .................177
9.2 How to use HOT KIMCHI.........................180
4. TROUBLE SHOOTING.......................82
4.1 RF Component ..........................................82 10. Phone Test Mode _ 3G smart
4.2 SIGNAL PATH_UMTS RF .........................85 Phone KS20 ...................................182
4.3 SIGNAL PATH_GSM RF ...........................86
4.4 Checking VCTCXO Block ..........................87 11. EXPLODED VIEW & REPLACEMENT
4.5 Checking Front-End Module Block ............89 PART LIST ..................................... 189
4.6 Checking UMTS Block...............................91 11.1 EXPLODED VIEW ................................ 189
4.7 Checking GSM Block.................................96 11.2 Replacement Parts
4.8 Checking Bluetooth Block........................102 ....................... 191
............................... 193
4.9 Checking WLAN Block.............................104
11.3 Accessory ............................................. 209
4.10 Power ON Troubleshooting ...................108
4.11 Charger Troubleshooting .......................110
4.12 USB Troubleshooting.............................113
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