Table Of Contents; Only For Training And Service Purposes - LG KP270 Service Manual

1. INTRODUCTION ...............................5
1.1 Purpose .................................................. 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE...............................8
2.1 Supporting Standard ................................8
2.2 Main Parts: Solution.................................8
2.3 HW Feature..............................................9
2.4 HW Spec................................................11
3. TECHNICAL BRIEF ........................15
3.1 Functional Block Diagram ......................15
3.2 Baseband Processor Introduction..........16
3.3 Power management IC ..........................28
3.4 Power ON/OFF ......................................35
3.5 SIM Interface..........................................36
3.6 MICRO SD connector ............................37
3.7 Memory ..................................................38
3.8 LCD Display ...........................................39
3.9 Keypad switching & scanning ................40
3.10 keypad back-light illumination ..............41
3.11 LCD back-light illumination ..................43
3.12 Battery voltage monitor ........................44
3.13 Audio....................................................45
3.14 BLUETOOTH .......................................48
3.15 18PIN Interface connector ...................51
3.16 General Description .............................52
3.17 GSM Part .............................................55
3.18 WCDMA Part .......................................60
3.19 GSM Power Amplifier Module..............62
3.20 WCDMA Band1 Power Amplifier
Module .................................................63
3.21 WCDMA Band1 Low Noise
Amplifier ..............................................64
3.22 WCDMA Band1 Duplexer ....................65
4. TROUBLE SHOOTING ...................66
4.1 Trouble shooting test setup....................66
4.2 Power on trouble....................................67
4.3 Charging Trouble ...................................70
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Only for training and service purposes

Table Of Contents

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4.4 UBS Trouble ..........................................73
4.5 SIM Detect Trouble ................................75
4.6 Number Key Sense Trouble...................78
4.7 Multi Key sense Trouble ........................80
4.8 Keypad backlight Trouble ......................82
4.9 Micro SD Trouble ...................................84
4.10 Audio Trouble.......................................86
4.11 Microphone Trouble .............................90
4.12 Camera Trouble ...................................94
4.13 Main LCD Trouble................................97
4.14 Bluetooth Trouble.................................99
4.15 RF Component...................................102
4.16 RF SIGNAL PATH .............................103
4.17 Trouble Shooting of GSM Part...........104
4.18 Trouble Shooting of WCDMA Part .....112
5. DOWNLOAD .....................................118
5.1 USB Driver Installation to Download....118
5.2 Device Detection..................................120
5.3 USB Port Mapping ...............................121
5.4 Configuration to Download...................122
5.5 Nexus setting .......................................124
6. CIRCUIT DIAGRAM ......................125
7. BGM PIN MAP...............................133
8. PCB LAYOUT ................................139
9. RF Calibration ..............................145
9.1 Test Equipment Setup .........................145
9.2 Calibration Step ...................................145
10. EXPLODED VIEW &
REPLACEMENT PART LIST ......151
10.1 Exploded View ...................................151
10.2 Replacement Parts ............................153
10.3 Accessory ..........................................174
LGE Internal Use Only