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LGE Internal Use Only Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 LG-A258 Functional Block Diagram............................................ 14
3.2 Digital Main Processor (PMB8815, U200) ................................. 15
3.3 Power Management ......................................................................... 20
3.4 FEM with integrated Power Amplifier Module
(SKY77550, U301)............................................................................... 33
3.5 Crystal(26 MHz, X100) ...................................................................... 36
3.6 RF Subsystem of PMB8815 (U101) .............................................. 37
3.7 MEMORY................................................................................................ 40
3.8 Bluetooth module.............................................................................. 45
3.9 SIM Card Interface.............................................................................. 47
3.10 LCD Interface..................................................................................... 48
3.11 Vibrator Interface............................................................................. 49
3.12 MINI ABB Interface .......................................................................... 50
3.13 Keypad Interface.............................................................................. 53
3.14 Audio Front-End............................................................................... 55
3.15 Camera Interface.............................................................................. 61
3.16 KEY BACLKLIGHT LED Interface ................................................. 63
4. TROUBLE SHOOTING ........................................................64
4.1 Trouble shooting test setup........................................................... 64
4.2 RF Component .................................................................................... 65
4.3 RX Trouble ............................................................................................. 66
4.4 TX Trouble.............................................................................................. 72
4.5 Power On Trouble............................................................................... 78
4.6 Charging Trouble................................................................................ 81
4.7 Vibrator Trouble .................................................................................. 84
4.8 LCD Trouble .......................................................................................... 87
4.9 Camera Trouble................................................................................... 91
4.10 Speaker Trouble................................................................................ 94
4.11 Earphone Trouble ............................................................................ 97
4.12 Micro SD Trouble............................................................................102
4.13 Bluetooth Trouble..........................................................................104
4.14 FM Radio Trouble...........................................................................106
5. DOWNLOAD.....................................................................109
6. BLOCK DIAGRAM.............................................................122
7. CIRCUIT DIAGRAM ..........................................................123
8. BGA PIN MAP ..................................................................128
9. PCB LAYOUT.....................................................................130
10. STAND ALONE TEST ......................................................132
10.1 Introduction.....................................................................................132
10.2 Setting Method ..............................................................................132
10.3 Tx Test .................................................................................................134
10.4 Rx Test.................................................................................................135
11.AUTO CALIBRATION.......................................................136
11.1 Overview...........................................................................................136
11.2 Directory structure of Tachyon.................................................136
11.3 Description of Folder & File........................................................137
11.4 Procedure..........................................................................................138
11.5 Tachyon Main UI.............................................................................139
11.6 AGC......................................................................................................140
11.7 APC ......................................................................................................140
11.8 ADC......................................................................................................140
11.9 Target Power....................................................................................140
12. EXPLODED VIEW & REPLACEMENT PART LIST ..........141
12.1 EXPLODED VIEW.............................................................................141
12.2 Replacement Parts ........................................................................142
12.3 Accessory ..........................................................................................157
