LG-525 Service Manual
This manual provides the information necessary to repair, calibration, description and download the features of this model.
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1. INTRODUCTION
1.1 Purpose . .......................................................................5
1.2 Regulatory Information . ..................................................5
1. Abbreviation . ...................................................................7
2. PERFORMANC
2.1 H/W Features . ................................................................9
2.2 Technical Specification. . ..................................................11
3. TECHNICAL BRIEF
3.1 Functional Block Diagram . .............................................16
3.2 Digital Main Processor (PMB8810, U101/U401) . ....17
3.3 Power Management . ........................................................22
3.4 FEM with integrated Power Amplifier Module (SKY77547, U01, U02) .....4
3.5 Crystal(26 MHz, X100, X400) . ........................................6
3.6 RF Subsystem of PMB8810 (U101, U401) . ................7
3.7 MEMORY . ........................................................................42
3.8 Bluetooth module . ............................................................48
3.9 Dual SIM Card Interface . .................................................50
3.10 LCD Interface . ...................................................................51
3.11 Battery Charger Interface . ...........................................54
3.12 Keypad Interface . ............................................................55
3.13 Audio Front-End . .............................................................56
3.14 Camera Interface(1.M Fixed Focus Camera) . ......62
3.15 Vibrator Interface . ...........................................................64
4. TROUBLE SHOOTING
4.1 Trouble shooting test setup . .........................................65
4.2 RF Component . ..................................................................66
4. RX Trouble . ...........................................................................68
4.4 TX Trouble . ...........................................................................74
4.5 Power On Trouble . ............................................................80
4.6 Charging Trouble. ..............................................................8
4.7 Vibrator Trouble . ................................................................85
4.8 LCD Trouble . ........................................................................87
4.9 Camera Trouble . .................................................................91
4.10 Speaker Trouble . .............................................................98
4.11 Earphone Trouble . ........................................................100
4.12 Receiver Trouble . ...........................................................10
4.1 Microphone Trouble . .................................................. 106
4.14 SIM Card Interface Trouble . .......................................108
4.15 Micro SD Trouble . ..........................................................110
4.16 WiFi Trouble . ...................................................................112
4.17 FM Radio Trouble . .........................................................116
5. DOWNLOAD
6. BLOCK DIAGRAM
7. CIRCUIT DIAGRAM
8. BGA Pin Map
9. PCB LAYOUT
10. STAND ALONE TEST
10.1 Introduction . ..................................................................149
10.2 Setting Method . ............................................................149
10. Tx Test. . ..............................................................................151
10.4 Rx Test . ............................................................................. 152
11. AUTO CALIBRATION
11.1 Overview. . ............................................................153
11.2 Configuration of HotKimchi . ....................................153
11. Description of Basic File . ..........................................154
11.4 Auto Calibration setup. ............................................155
11.5 Procedure . ............................................................156
11.6 AGC . ...................................................................158
11.7 APC . ...................................................................158
11.8 ADC . ..................................................................158
11.9 Target Power . .......................................................158
12. EXPLODED VIEW & REPLACEMENT PART LIST
12.1 EXPLODED VIEW . ....................................................... 159
12.2 Replacement Parts . ......................................................161
12. Accessory . ....................................................................117
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