Service Manuals, User Guides, Schematic Diagrams or docs for : LG Mobile Phone LG KG290, KG291 LG KG290, KG291
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Service Manual
Internal Use Only
Service Manual
KG290/KG291
Model : KG290/KG291
Date: October, 2007 / Issue 1.0
Table Of Contents
1. INTRODUCTION ...............................5 5. DOWNLOAD.......................................94
1.1 Purpose .................................................. 5 5.1 Download ...............................................94
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
6. BLOCK DIAGRAM ........................100
2. PERFORMANCE...............................9 7. CIRCUIT DIAGRAM ......................101
2.1 H/W Features...........................................9
8. BGA IC Pin Check ........................109
2.2 Technical Specification ..........................10
3. TECHNICAL BRIEF ........................15 9. PCB LAYOUT ................................113
3.1 Power Amplifier (SKY77318, U500).......15 10. ENGINEERING MODE ................117
3.2 Transceiver (AD6548, U501) .................17
10.1 BB Test [MENU 1]..............................118
3.3 FEM for Triband(FL500) ........................19
10.2 RF Test [MENU 2]..............................120
3.4 26 26 MHz Clock (DCXO, X500) ...........20
10.3 MF mode [MENU 3] ...........................120
3.5 Baseband Processor (AD6721 , U103)..21
10.4 Trace option [MENU 4] ......................121
3.6 Battery Charging Block ..........................26
10.5 Call timer [MENU 5] ...........................121
3.7 Display and Interface .............................28
10.6 Fact. Reset [MENU 6] ........................121
3.8 Camera IC(AIT813G , U400) .................30
10.7 S/W version........................................121
3.9 Keypad Switches and Scanning ............32
3.10 Microphone ..........................................33 11. STAND ALONE TEST .................122
3.11 Main Speaker.......................................33 11.1 Introduction ........................................122
3.12 Headset Interface.................................35 11.2 Setting Method...................................122
3.13 Key Back-light Illumination...................36 11.3 Means of Test ....................................123
3.14 LCD Back-light Illumination..................37
3.15 VIBRATOR...........................................38 12. AUTO CALIBRATION .................125
3.16 Bluetooth..............................................39 12.1 Overview ............................................125
3.17 Circuit Description................................40 12.2 Equipment List ...................................125
12.3 Test Jig Operation..............................126
4. TROUBLE SHOOTING ...................56
12.4 Procedure ..........................................127
4.1 RF Component.......................................56 12.5 AGC ...................................................130
4.2 RX Trouble.............................................57 12.6 APC....................................................130
4.3 TX Trouble .............................................62 12.7 ADC ...................................................130
4.4 Power On Trouble..................................68
4.5 Charging Trouble ...................................70 13. EXPLODED VIEW &
4.6 Vibrator Trouble .....................................72 REPLACEMENT PART LIST ..... 131
4.7 LCD Trouble...........................................74 13.1 Exploded View .................................. 131
4.8 Camera Trouble .....................................77
13.2 Replacement Parts ............................133
4.9 Speaker & Receiver Trouble..................80
13.3 Accessory ......................................... 151
4.10 SIM Card Interface Trouble..................82
4.11 Earphone Trouble ................................84
4.12 KEY backlight Trouble .........................86
4.13 Microphone Trouble .............................88
4.14 RTC Trouble ........................................90
4.15 Slide on/off Trouble..............................92
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