Table Of Contents - LG KF350 Service Manual

1. INTRODUCTION ..........................7
1.1 Purpose ........................................... 7
1.2 Regulatory Information ..................... 7
1.3 ABBREVIATION ............................... 9
2. PERFORMANCE ........................11
2.1 H/W Features ..................................11
2.2 Technical specification ....................12
3. TECHNICAL BRIEF ...................19
3.1 Baseband Processor (BBP)
Introduction......................................19
3.2 Power management IC ...................32
3.3 Power ON/OFF ...............................37
3.4 SIM & uSD interface........................38
3.5 Memory ...........................................40
3.6 LCD Display ....................................41
3.7 Keypad Switching & Scanning ........42
3.8 Keypad back-light illumination.........43
3.9 LCD back-light illumination..............44
3.10 ALC ...............................................46
3.11 JTAG & ETM interface connector ..46
3.12 Audio .............................................47
3.13 Charging circuit .............................48
3.14 FM radio & BLUETOOTH..............49
3.15 18pin Multi Media Interface
connector.......................................52
3.16 General Description ......................55
3.17 Receiver part .................................57
3.18 Transmitter part .............................58
3.19 RF synthesizer ..............................59
3.20 DCXO ............................................59
3.21 Front End Module control ..............60
3.22 Power Amplifier Module ................61
3.23 Mode Selection .............................62
3.24 PAM Schematic .............................63
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Table Of Contents

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4. TROUBLE SHOOTING ..............64
4.1 Trouble shooting test setup .............64
4.2 Power on Trouble ............................65
4.3 Charging trouble..............................68
4.4 LCD display trouble .........................70
4.5 Camera Troublez.............................72
4.6 Receiver & Speaker troublea ..........74
4.7 Microphone trouble .........................77
4.8 Vibrator trouble................................79
4.9 Keypad back light trouble ................81
4.10 SIM & uSD trouble ........................83
4.11 Photo senser trouble .....................86
4.12 sideview LED trouble ....................87
4.13 Trouble shooting of Receiver part .88
4.14 Trouble shooting of Transmitter
part. ...............................................94
5. DOWNLOAD & S/W UPGRADE .103
6. BLOCK DIAGRAM ...................114
7. CIRCUIT DIAGRAM .................115
8. BGA PIN MAP ..........................123
9. PCB LAYOUT ...........................129
10. RF CALIBRATION..................143
10.1 Test Equipment Setup .................143
10.2 Calibration Step...........................143
11. STAND-ALONE TEST ............149
11.1 Test Program Setting ...................149
11.2 Tx Test .........................................151
11.3 Rx Test.........................................152
12. EXPLODED VIEW &
REPLACEMENT PART LIST .153
12.1 Exploded View.............................153
12.2 Replacement Parts......................155
12.3 Accessory....................................174
LGE Internal Use Only