Table Of Contents - LG U8120 Service Manual

1. INTRODUCTION .............................. 6
1.1 Purpose................................................... 6
1.2 Regulatory Information............................ 6
1.3 Abbreviations .......................................... 8
2. PERFORMANCE............................ 10
2.1 System Overview .................................. 10
2.2 Usable environment .............................. 11
2.3 Radio Performance ............................... 11
2.4 Current Consumption............................ 17
2.5 RSSI...................................................... 17
2.6 Battery Bar ............................................ 17
2.7 Sound Pressure Level........................... 18
2.8 Charging ............................................... 19
3. Technical Brief .............................. 20
3.1 Digital Baseband(DBB)&
Multimedia Processor ........................... 20
3.1.1 General Description ........................ 20
3.1.2 Hardware Architecture .................... 21
3.1.3 External memory interface .............. 25
3.1.4 RF Interface .................................... 26
3.1.5 SIM Interface .................................. 28
3.1.6 UART Interface ............................... 28
3.1.7 GPIO (General Purpose Input/Output)
map ................................................. 29
3.1.8 USB ................................................ 31
3.1.9 IrDA Interface.................................. 33
3.1.10 Folder ON/OFF Operation ............ 34
3.1.11 Power On Sequence..................... 35
3.1.12 Key Pad ........................................ 36
3.2 GAM Hardware Subsystem .................. 37
3.2.1 General Description ........................ 37
3.2.2 Block Description ............................ 38

Table Of Contents

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3.2.3 Camera & Camera FPC Interface... 40
3.2.4 Camera Position Detection ............. 42
3.2.5 Camera Regulator .......................... 42
3.2.6 Display & LCD FPC Interface ......... 43
3.2.7 Main LCD Backlight Illumination ..... 46
3.2.8 Sub LCD Backlight Illumination ...... 47
3.2.9 Keypad Illumination ........................ 48
3.2.10 Camera Flash Illumination ............ 49
3.3 LCD Module .......................................... 50
3.4 Analog Baseband (ABB) Processor...... 51
3.4.1 Overview of Audio path................... 51
3.4.2 Audio Signal Processing &
Interface .......................................... 52
3.4.3 Audio Mode..................................... 54
3.4.4 Voice Call........................................ 55
3.4.5 MIDI (Ring Tone Play) .................... 59
3.4.6 MP3 (Audio Player)......................... 60
3.4.7 Video Telephony ............................. 61
3.4.8 Audio Main Component .................. 62
3.4.9 GPADC(General Purpose ADC) and
AUTOADC2 .................................... 64
3.4.10 Charger control ............................. 65
3.4.11 Fuel Gauge ................................... 66
3.4.12 Battery Temperature
Measurement ................................ 67
3.4.13 Charging Part................................ 68
3.5 Voltage Regulation ............................... 71
3.5.1 Internal Regulation.......................... 71
3.5.2 External Regulation ........................ 71
3.6 General Description .............................. 73
3.7 GSM Mode............................................ 75
3.7.1 Receiver.......................................... 75
3.7.2 Transmitter...................................... 80
3.8 WCDMA Mode ...................................... 82
3.8.1 Receiver.......................................... 82