LG KG225, Service Manual

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1. INTRODUCTION ...............................5
1.1 Purpose .................................................. 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE...............................9
2.1 H/W Features...........................................9
2.2 Technical Specification ..........................10
3. TECHNICAL BRIEF ........................15
3.1 Power Transceiver .................................15
3.2 FEM for Triband .....................................17
3.3 26 MHz Clock.........................................18
3.4 Baseband Processor..............................19
3.5 Battery Charging Block ..........................24
3.6 Display and Interface .............................26
3.7 Camera IC..............................................28
3.8 Keypad Switches and Scanning ............30
3.9 Microphone ............................................31
3.10 Main Speaker.......................................32
3.11 Headset Interface.................................33
3.12 Key Back-light Illumination...................34
3.13 LCD Back-light Illumination..................35
3.14 VIBRATOR...........................................36
4. TROUBLE SHOOTING ...................37
4.1 RF Component.......................................37
4.2 RX Trouble.............................................38
4.3 TX Trouble .............................................44
4.4 Power On Trouble..................................51
4.5 Charging Trouble ...................................53
4.6 Vibrator Trouble .....................................55
4.7 LCD Trouble...........................................57
4.8 Camera Trouble .....................................59
4.9 Speaker Trouble ....................................61
4.10 SIM Card Interface Trouble..................63
4.11 Earphone Trouble ................................65
4.12 KEY backlight Trouble .........................67
4.13 Receiver Trouble..................................69
4.14 Microphone Trouble .............................71
4.15 RTC Trouble ........................................73
4.16 Indication LED Trouble ........................75
4.17 Folder on/off Trouble............................77
5. DOWNLOAD.......................................79
5.1 Download ...............................................79
6. BLOCK DIAGRAM ..........................85
7. Circuit Diagram ..............................87
8. pcb layout .......................................93
9. ENGINEERING MODE ....................95
9.1 BB Test [MENU 1]..................................96
9.2 RF Test [MENU 2]..................................98
9.3 MF mode [MENU 3] ...............................98
9.4 Trace option [MENU 4] ..........................99
9.5 Call timer [MENU 5] ...............................99
9.6 Fact. Reset [MENU 6] ............................99
9.7 S/W version............................................99
10. STAND ALONE TEST .................100
10.1 Introduction ........................................100
10.2 Setting Method...................................100
10.3 Means of Test ....................................101
11. AUTO CALIBRATION..................103
11.1 Overview ............................................103
11.2 Equipment List ...................................103
11.3 Test Jig Operation..............................104
11.4 Procedure ..........................................105
11.5 AGC ...................................................108
11.6 APC....................................................108
11.7 ADC ...................................................108
12. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 109
12.1 Exploded View .................................. 109
12.2 Replacement Parts ............................111
12.3 Accessory ......................................... 125
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