Table Of Contents - LG GT350 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 GT50 Functional Block diagram ...........................................17
.2 Baseband Processor (BBP) Introduction..............................18
. Power management IC ..............................................................0
.4. Power ON/OFF ..............................................................................5
.5. SIM & uSD interface ....................................................................7
.6. Memory ...........................................................................................9
.7. LCD Display ....................................................................................40
.8. Keypad Switching & Scanning ...............................................41
.9. Keypad back-light illumination .............................................42
.10. LCD back-light illumination ..................................................44
.11. Audio ..............................................................................................45
.1. charging circuit ..........................................................................48
.14 FM radio & BLUETOOTH ..........................................................49
.15. 5pin u-USB Interface connector..........................................5
.16. General Description .................................................................56
.17. Receiver part ...............................................................................58
.18. Transmitter part .........................................................................59
.19. RF synthesizer .............................................................................60
.20. Front End Module control .....................................................61
.21. Power Amplifier Module ........................................................62
.22. PAM Schematic ..........................................................................6
4. TROUBLE SHOOTING .......................................................64
4.1 Trouble shooting test setup .....................................................64
4.2 Power on Trouble ..........................................................................65
4. Charging trouble ..........................................................................68
4.4 LCD display trouble .....................................................................71
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Table Of Contents

4.5 Camera Trouble .............................................................................7
4.6 Receiver & Speaker trouble ......................................................75
4.7 Microphone trouble ....................................................................77
4.8 Vibrator trouble .............................................................................79
4.9 Keypad back light trouble .........................................................81
4.10 SIM & uSD trouble ......................................................................8
4.11 Touch trouble...............................................................................87
4.12 Trouble shooting of Receiver part .......................................89
4.1 Trouble shooting of Transmitter part. ................................95
5. DOWNLOAD ................................................................... 104
6. BLOCK DIAGRAM ........................................................... 117
7. CIRCUIT DIAGRAM ........................................................ 119
8. BGA Pin Map .................................................................. 129
9. PCB LAYOUT ................................................................... 133
10.ENGINEERING MODE ................................................... 139
10.1. Test Equipment Setup .......................................................... 19
10.2. Calibration Step ...................................................................... 19
11. STAND ALONE TEST .................................................... 144
11.1 Test Program Setting ............................................................. 144
11.2 Tx Test ........................................................................................... 144
11.4 Rx Test .......................................................................................... 149
12. EXPLODED VIEW & REPLACEMENT
PART LIST .................................................................... 151
12.1 EXPLODED VIEW ...................................................................... 151
12.2 Replacement Parts.................................................................. 15
12. Accessory ................................................................................... 176
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