LG L705ix, Service Manual

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1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
2. PERFORMANCE...............................7
2.1 System Overview .....................................7
2.2 Usable environment .................................8
2.3 Radio Performance ..................................9
2.4 Current Consumption.............................12
2.5 Antenna BAR .........................................12
2.6 Battery BAR ...........................................13
2.7 Sound Pressure Level............................14
2.8 Charging ................................................14
3. TECHNICAL BRIEF ........................15
3.1 General Description ...............................17
3.2 GSM Mode.............................................19
3.3 LO Phase-locked Loop ..........................20
3.4 Off-chip RF Components .......................22
3.5 ISDB-T (1 Seg Receiver) .......................28
3.6 Digital Baseband(DBB/MSM6280).........29
3.7 Block Diagram (MSM 6280)...................30
3.8 Subsystem(MSM6280) ..........................31
3.9 Power Block ...........................................38
3.10 External memory interface ...................43
3.11 H/W Sub System..................................44
3.12 Main Features ......................................57
4. TROUBLE SHOOTING ...................63
4.1 RF Component.......................................63
4.2 Checking TCXO Block ...........................65
4.3 Checking UMTS Block ...........................67
4.4 1- SEG Tuner.........................................76
4.5 Power ON ..............................................79
4.6 Charger ..................................................82
4.7 USB........................................................85
4.8 SIM Detect .............................................87
4.9 Camera ..................................................89
4.10 Keypad Backlight .................................93
4.11 FOLDER Close / Open ........................94
4.12 Main LCD .............................................95
4.13 Audio....................................................96
4.14 Headset path........................................98
4.15 Speaker phone path...........................100
4.16 Main microphone ...............................102
4.17 Headset microphone..........................104
4.18 Vibrator ..............................................106
5. DOWNLOAD .................................107
5.1 Introduction ..........................................107
5.2 Downloading Procedure.......................107
5.3 Troubleshooting download errors ........121
5.4 Caution.................................................127
6. BLOCK DIAGRAM ........................128
6.1 UMTS and 1seg RF Block diagram .....128
6.2 Interface Diagram ................................130
7. Circuit Diagram ............................133
8. BGM Pin Map................................145
9. PCB LAYOUT ................................147
10. Calibration & RF Auto Test
Program (Hot Kimchi)................155
10.1 Configuration of HOT KIMCHI ...........155
10.2 How to use HOT KIMCHI...................156
11. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 159
11.1 EXPLODED VIEW ............................ 159
11.2 Replacement Parts
<Mechanic component>.................... 161
<Main component> ........................... 165
11.3 Accessory ......................................... 185
Table Of Contents
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