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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION ............................................... 5
1.1 Purpose ......................................................................5
1.2 Regulatory Information .................................................5
1.3. ABBREVIATION ...........................................................7
2. PERFORMANCE ............................................... 9
2.1 Supporting Standard ....................................................9
2.2 Main Parts : Solution ..................................................10
2.3 H/W features .............................................................10
2.4 HW Spec. ................................................................12
3. BB CIRCUIT TECHNICAL BRIEF ..................... 15
3.1 Functional Block Diagram ..........................................15
3.2 Baseband Processor Introduction ..............................15
3.3 Power management IC...............................................27
3.4 Power ON/OFF ..........................................................34
3.5 SIM Interface .............................................................35
3.6 MICRO SD connector .................................................36
3.7 Memory ....................................................................37
3.8 LCD Display ..............................................................38
3.9 Keypad switching & scanning .....................................39
3.10 keypad back-light illumination ..................................40
3.12 Battery voltage monitor ............................................42
3.13 Audio ......................................................................43
3.14 BLUETOOTH ............................................................46
3.15 18PIN Interface connector ........................................49
4. RF Circuit Technical Brief ............................ 50
4.1 General Description ...................................................50
4.2 GSM Part ..................................................................53
4.3 WCDMA Part .............................................................57
4.4 GSM Power Amplifi er Module .....................................59
4.5 WCDMA Band1+8 Power Amplifi er Module .................60
4.6 WCDMA Band1+8 Low Noise Amplifi er .......................61
4.7 WCDMA Band1 Duplexer ...........................................62
4.8 WCDMA Band5 Duplexer ...........................................63
5. Trouble shooting .......................................... 64
5.1 Trouble shooting test setup ........................................64
5.2 Power on trouble .......................................................65
5.3 Charging Trouble .......................................................68
5.4 USB Trouble ..............................................................71
5.5 SIM Detect Trouble ....................................................73
5.6 Number Key Sense Trouble ........................................75
5.7 Multi Key sense Trouble .............................................77
5.8 Keypad backlight Trouble ...........................................79
5.9 Micro SD Trouble .......................................................81
5.10 Audio Trouble ..........................................................83
5.11 Microphone Trouble .................................................87
5.12 Camera Trouble .......................................................91
5.13 Main LCD Trouble ....................................................93
5.14 Bluetooth Trouble .....................................................95
5.15 RF Component ........................................................98
5.16 RF SIGNAL PATH .....................................................99
5.17 Trouble Shoothing of GSM Part ...............................100
5.18 Trouble Shooting of WCDMA Part ............................108
6. DOWNLOAD & S/W UPGRADE ..................... 115
7. BLOCK DIAGRAM ........................................ 126
8. CIRCUIT DIAGRAM ...................................... 127
9. BGA Pin Map .............................................. 137
10. PCB LAYOUT ............................................. 143
11. RF Calibration .......................................... 155
11.1. Test Equipment Setup ...........................................155
11.2. Calibration Step ....................................................155
12. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................ 161
12.1 EXPLODED VIEW ...................................................161
12.2 Replacement Parts ................................................163
12.3 Accessory ............................................................. 191