LG MG300d, Service Manual

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1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE.............................. 9
2.1 H/W Feature............................................ 9
2.2 RF Characteristics ................................ 15
2.3 Technical Specification ......................... 18
3. TECHNICAL BRIEF ....................... 23
3.1 Power Transceiver .................................23
3.2 13 MHz Clock.........................................30
3.3 Switchplexer for Triband ........................30
3.4 Digital Main Processor ...........................32
3.5 Analog Main & Power Management
Processor...............................................38
3.6 Chargind IC............................................46
3.7 CAMERA IC ...........................................49
3.8 MIDI IC...................................................51
3.9 Keypad Switches and Scanning ............55
3.10 Microphone ..........................................56
3.11 Main Speaker.......................................56
3.12 Headset Interface.................................57
3.13 MEMORY.............................................58
BLUETOOTH .......................................59
CAMERA CONNECTOR, CAMERA LDO ..60
FLASH LED CHARGE PUMP..............61
NAND MEMORY..................................62
FLIP SWITCH ......................................63
3.14 VIBRATOR...........................................64
4. TROUBLESHOOTING ................... 65
4.1 RX Trouble.............................................65
4.2 TX Trouble .............................................71
4.3 Power On Trouble..................................78
4.4 Charging Trouble ...................................80
4.5 Vibrator Trouble .....................................82
4.6 LCD Trouble...........................................84
4.7 BT Trouble .............................................87
4.8 Speaker Trouble ....................................90
4.9 SIM Card Interface Trouble....................92
4.10 Earphone Trouble ................................94
4.11 Receiver Trouble..................................96
4.12 Microphone Trouble .............................98
4.13 RTC Trouble ......................................100
5. DOWNLOAD AND CALIBRATION ..... 102
5.1 Download ............................................ 102
5.2 Calibration........................................... 106
6. BLOCK DIAGRAM ....................... 113
7. CIRCUIT DIAGRAM ..................... 115
8. PCB LAYOUT ............................... 125
9. ENGINEERING MODE ..................127
9.1 BB Test [MENU 1]................................128
9.2 RF Test [MENU 2]................................130
9.3 MF mode [MENU 3] .............................130
9.4 Trace option [MENU 4] ........................131
9.5 Call timer [MENU 5] .............................131
9.6 Fact. Reset [MENU 6] ..........................131
9.7 S/W version..........................................131
10. STAND ALONE TEST ................ 132
10.1 Introduction ........................................132
10.2 Setting Method...................................132
10.3 Means of Test ....................................133
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