LG KF390, Service Manual

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1. INTRODUCTION.................................. 5
1.1 Purpose ...................................................... 5
1.2 Regulatory Information ............................... 5
2. PERFORMANCE ..................................7
2.1 Usable environment.....................................8
2.2 Radio Performance......................................8
2.3 Current Consumption.................................14
2.4 RSSI BAR ..................................................14
2.5 Battery BAR ...............................................15
2.6 Sound Pressure Level ...............................17
2.7 Charging ....................................................17
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/MSM6280) ...........34
3.7 Subsystem(MSM6280) ..............................36
3.8 Power Block...............................................44
3.9 External memory interface.........................49
3.10 H/W Sub System .....................................51
3.11 Block Diagram(MSM6280) ......................68
3.12 Main Features..........................................69
4. TROUBLE SHOOTING.......................71
4.1 An introduction to RF .................................71
4.2 Checking GSM...........................................72
4.3 Checking WCDMA Block ...........................78
4.4 Checking TCXO block ...............................82
4.5 Bluetooth trouble........................................84
4.6 Power On Troubleshooting ........................86
4.7 Battery Charging Troubleshooting .............90
4.8 USB Troubleshooting.................................92
4.9 SIM Detect Troubleshooting ......................93
4.10 Camera Troubleshooting .........................94
4.11 LCD module Troubleshooting ................100
4.12 Audio Troubleshooting...........................103
4.13 Touch PAD troubleshooting...................109
5. DOWNLOAD .....................................110
5.1 Introduction ..............................................110
5.2 Downloading Procedure ..........................110
5.3 Troubleshooting Download Errors ..........123
5.4 Caution ....................................................128
6. BLOCK DIAGRAM ...........................129
7. CIRCUIT DIAGRAM..........................131
8. BGA IC PIN MAP..............................137
9. PCB LAYOUT ...................................141
10. Calibration & RF Auto Test Program
(Hot Kimchi) ...................................147
10.1 Configuration of HOT KIMCHI ...............147
10.2 How to use HOT KIMCHI.......................149
11. Engineering Mode
(Phone Test Mode).........................151
12. EXPLODED VIEW & REPLACEMENT
PART LIST ..................................... 153
12.1 EXPLODED VIEW ................................ 153
12.2 Replacement Parts
<Mechanic component> ....................... 157
<Main component> ............................... 160
12.3 Accessory ............................................. 178
Table Of Contents
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