Table Of Contents - LG GW520 Service Manual

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 ..................... 17
3.1 Functional Block Diagram ..........................................17
3.2 Baseband Processor Introduction ...............................18
3.3 Power management IC...............................................31
3.4. Power ON/OFF .........................................................39
3.5 SIM Interface .............................................................40
3.6 MICRO SD connector .................................................41
3.7 Memory ....................................................................42
3.8 LCD Display ..............................................................43
3.9 Keypad switching & scanning .....................................44
3.10 keypad back-light illumination ..................................45
3.11 LCD back-light illumination ......................................47
3.12 Battery voltage monitor ............................................48
3.13 Audio ......................................................................49
3.14 Bluetooth/FM (RBCA-B561A)....................................51
3.15 5PIN Interface connector ..........................................53
4. RF Circuit Technical Brief ............................ 54
4.1 General Description ...................................................54
4.2 GSM Part ..................................................................58
4.3 WCDMA Part .............................................................62
4.4 GSM Power Amplifi er Module .....................................65
4.5 WCDMA Band1/8 Power Amplifi er Module ..................66
4.6 WCDMA Band1/8 Low Noise Amplifi er ........................67
4.7 WCDMA Band1 Duplexer ...........................................68
4.8 WCDMA Band8 Duplexer ...........................................68
5. Trouble shooting .......................................... 69
5.1 Trouble shooting test setup ........................................69
5.2. Power on trouble ......................................................70
5.3 Charging Trouble .......................................................73
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Only for training and service purposes

Table Of Contents

5.4 USB Trouble ..............................................................75
5.5 SIM Detect Trouble ....................................................78
5.6 Qwerty Key Sense Trouble ..........................................81
5.7 Slide Key sense Trouble .............................................83
5.8 Keypad backlight Trouble ...........................................84
5.9 Micro SD Trouble .......................................................86
5.10 Audio Trouble ..........................................................88
5.11 Microphone Trouble .................................................92
5.12 Camera Trouble .......................................................94
5.13 Main LCD Trouble ....................................................96
5.14 Bluetooth Trouble .....................................................98
5.15 RF Component ......................................................101
5.16 GSM PATH ............................................................103
5.17 Trouble Shooting of GSM Part .................................103
5.18 Trouble Shooting of WCDMA Part ............................112
6. Download & S/W upgrade ......................... 118
7. BLOCK DIAGRAM ........................................ 148
8. CIRCUIT DIAGRAM ...................................... 149
9. BGA Pin Map .............................................. 157
10. PCB LAYOUT ............................................. 161
11. RF Calibration .......................................... 167
11.1. Test Equipment Setup ...........................................167
11.2. Calibration Step ....................................................167
12. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................ 173
12.1 EXPLODED VIEW ...................................................173
12.2 Replacement Parts ................................................175
12.3 Accessory ............................................................. 201
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