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Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information .........................................................................3
1.3 Abbreviations.............................................................................................5
2. PERFORMANCE...................................................................... 7
2.1 H/W Features..............................................................................................7
2.2 Technical Specification...........................................................................9
3. TECHNICAL BRIEF................................................................ 14
3.1 Digital Main Processor......................................................................... 14
3.2 Power Management ............................................................................ 18
3.3 FEM with integrated Power Amplifier Module
(SKY77550, U301).................................................................................. 30
3.4 Crystal(26 MHz, X102) ......................................................................... 32
3.5 RF Subsystem of PMB8810 (U101) ................................................. 32
3.6 MEMORY(FM25Q32, U102) ............................................................... 36
3.7 SIM Card Interface................................................................................. 38
3.8 Display Interface.................................................................................... 39
3.9 Battery Charger Interface................................................................... 41
3.10 Keypad Interface................................................................................. 42
3.11 Audio Front-End.................................................................................. 44
3.12 KEY BACLKLIGHT LED Interface .................................................... 50
3.13 Vibrator Interface................................................................................ 51
3.14 Torch LED Interface............................................................................ 52
4. TROUBLE SHOOTING .......................................................... 53
4.1 RF Component ....................................................................................... 53
4.2 RX Trouble ................................................................................................ 54
4.3 TX Trouble................................................................................................. 58
4.4 Power On Trouble.................................................................................. 62
4.5 Charging Trouble................................................................................... 65
4.6 Vibrator Trouble ..................................................................................... 67
4.7 LCD Trouble ............................................................................................. 69
4.8 Speaker Trouble ..................................................................................... 72
4.9 Earphone Trouble.................................................................................. 75
4.10 Microphone Trouble.......................................................................... 78
4.11 SIM Card Interface Trouble.............................................................. 80
4.12 KEY backlight Trouble....................................................................... 82
5. DOWNLOAD......................................................................... 85
6. BLOCK DIAGRAM................................................................. 98
7. CIRCUIT DIAGRAM .............................................................. 99
8. BGA PIN MAP ....................................................................103
9. PCB LAYOUT.......................................................................104
10. ENGINEERING MODE ......................................................106
11. AUTO CALIBRATION........................................................107
11.1 Overview..............................................................................................107
11.2 Directory structure of Tachyon....................................................107
11.3 Description of Folder & File...........................................................108
11.4 Procedure.............................................................................................109
11.5 Tachyon Main UI................................................................................110
11.6 AGC.........................................................................................................111
11.7 APC .........................................................................................................111
11.8 ADC.........................................................................................................111
11.9 Target Power.......................................................................................111
12. EXPLODED VIEW & REPLACEMENT PART LIST .............112
12.1 EXPLODED VIEW................................................................................112
12.2 Replacement Parts ...........................................................................113
12.3 Accessory .............................................................................................123
