Table Of Contents - LG GX500 Service Manual

1. INTRODUCTION .................................................5
1.1 Purpose ............................................................................................... 5
1.2 Regulatory Information ............................................................... 5
1. Abbreviations ................................................................................... 7
2. PERFORMANCE ..................................................9
2.1 H/W Features .................................................................................... 9
2.2 Technical Specification ...............................................................10
3. TECHNICAL BRIEF ............................................17
.1 GX500 Functional Block diagram...........................................17
.2 Dual Baseband Processor (BBP) Introduction ...................18
. Power management IC ..............................................................8
.4 Power ON/OFF ...............................................................................46
.5 Dual SIM & u-SD Interface .........................................................48
.6 Memory ............................................................................................50
.7 LCD Display .....................................................................................5
.8 Keypad Switching & Scanning ................................................54
.9 LCD back-light illumination ......................................................55
.10 JTAG & ETM interface connector .........................................56
.11 Audio ...............................................................................................57
.12 Charging circuit ..........................................................................59
.1 WI-FI & BLUETOOTH & FMradio ............................................60
.14 5pin Micro USB Interface connector ..................................6
.15 Triaxial, digital acceleration sensor .....................................64
.16 General Description ..................................................................66
.17 Receiver part ................................................................................68
.18 Transmitter part ..........................................................................69
.19 RF synthesizer ..............................................................................70
.20 DCXO ...............................................................................................70
.21 Front End Module control ......................................................71
.22 Power Amplifier Module .........................................................72
.2 PAM Schematic ...........................................................................7
4. TROUBLE SHOOTING ......................................74
4.1 Trouble shooting test setup .....................................................74
4.2 Power on Trouble ..........................................................................75
4. Charging trouble ..........................................................................78
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Only for training and service purposes

Table Of Contents

4.4 LCD display trouble .....................................................................80
4.5 Camera Trouble .............................................................................82
4.6 Receiver & Speaker trouble ......................................................84
4.7 Microphone trouble ....................................................................86
4.8 Vibrator trouble .............................................................................87
4.9 SIM & uSD trouble ........................................................................89
4.10 Touch trouble...............................................................................92
4.11 LCD LED trouble .........................................................................9
4.12 Trouble shooting of Receiver part .......................................94
4.1 Trouble shooting of Transmitter part .............................. 100
4.14 Trouble shooting of WI-FI/BT/FM part ............................ 109
5. DOWNLOAD & S/W UPGRADE......................112
6. BLOCK DIAGRAM ...........................................120
7. CIRCUIT DIAGRAM ........................................121
8. BGA Pin Map ..................................................129
9. PCB LAYOUT ...................................................139
10. RF CALIBRATION .........................................147
10.1 Test Equipment Setup ........................................................... 147
10.2 Calibration Step ....................................................................... 147
11. STAND ALONE TEST ....................................152
11.1 SIM1 TEST ................................................................................... 152
11.2 SIM2 TEST ................................................................................... 159
12. ENGINEERING MODE ..................................161
13. EXPLODED VIEW & REPLACEMENT
PART LIST ....................................................163
1.1 EXPLODED VIEW ...................................................................... 16
1.2 Replacement Parts.................................................................. 165
1. Accessory ................................................................................... 189
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