Table Of Contents - LG KF690 Service Manual

1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
2. PERFORMANCE...............................7
2.1 Supporting Standard ................................7
2.2 Main Parts : Solution................................7
2.3 HW Features............................................8
2.4 HW Spec................................................10
3. TECHNICAL BRIEF ........................12
3.1 General Description ...............................12
3.2 GSM Mode.............................................14
3.3 LO generation and distribution circuits...17
3.4 Off-chip RF Components .......................18
3.5 Digital Baseband (DBB/ESM6270) ........25
3.6 Subsystem(ESM6270) ...........................27
3.7 Power Block ...........................................34
3.8 External memory interface .....................39
3.9 H/W Sub System....................................41
3.10 Feature List ..........................................54
3.11 Touch Screen Interface........................59
4. TROUBLE SHOOTING ...................60
4.1 Power on trouble....................................60
4.2 USB trouble............................................62
4.3 SIM detect trouble..................................63
4.4 Key sense trouble (KEYPAD) ................64
4.5 Keypad backlight trouble........................67
4.6 Micro SD trouble ....................................68
4.7 Audio trouble..........................................69
4.8 Camera trouble ......................................84
4.9 Main LCD trouble ...................................87
4.10 Bluetooth trouble..................................90
4.11 Touch Screen trouble...........................92
4.12 RF Component.....................................94
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Table Of Contents

- 3 -
4.13 SIGNAL PATH .....................................95
4.14 Checking VCTCXO Block ....................96
4.15 Checking Front-End Module Block ......98
4.16 Checking GSM Block .........................101
5. DOWNLOAD .................................107
5.1 Introduction ..........................................107
5.2 Downloading Procedure.......................107
5.3 Troubleshooting Download Errors .......120
5.4 Caution.................................................122
6. BLOCK DIAGRAM ........................123
6.1 GSM & UMTS RF Block.......................123
6.2 Interface Diagram ................................124
7. Circuit Diagram ............................127
8. BGM Pin Map................................135
9. PCB LAYOUT ................................141
10. CALIBRATION & RF AUTO TEST
(HOT KIMCHI) .............................147
10.1 Usage of Hot-Kimchi ..........................147
11. EXPLODED VIEW &
REPLACEMENT PART LIST ......151
11.1 EXPLODED VIEW .............................151
11.2 Replacement Parts
<Mechanic component>.....................153
<Main component> ............................158
11.3 Accessory ..........................................175
LGE Internal Use Only