Table Of Contents - LG CG225 Service Manual

1. Introduction ..................................... 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. General Performance...................... 9
2.1 Product Name ......................................... 9
2.2 Supporting Standard ............................... 9
2.3 Main Parts: GSM Solution........................9
2.4 H/W Features.........................................10
2.5 S/W Features .........................................12
3. H/W Circuit Description................ 14
3.1 RF Transceiver General Description..... 14
3.2 Receiver Part ........................................ 14
3.3 Transmitter Part .................................... 17
3.4 Digital Baseband (DBB) Processor........20
3.5 Analog Baseband (ABB) Processor...... 25
4. TROUBLE SHOOTING .................. 46
4.1 Main Components Placement............... 46
4.2 FPCB Components Placement ............. 47
4.3 Baseband Components ........................ 47
4.4 Main Components (Description) ........... 48
4.5 Power On Trouble................................. 49
4.6 Charging Trouble .................................. 50
4.7 LCD Display Trouble............................. 52
4.8 Camera Trouble .................................... 54
4.9 Receiver Trouble................................... 56
4.10 Microphone Trouble ............................ 60
4.11 Vibrator Trouble .................................. 63
4.12 Keypad Backlight Trouble ................... 65
4.13 Folder ON/OFF Trouble ...................... 67
4.14 SIM Detect Trouble ............................. 69
4.15 Earphone Trouble ............................... 71
4.16 RF Rx pass Trouble Shooting..............75
4.17 RF Tx pass Trouble Shooting ..............82

Table of Contents

- 3 -
5. DOWNLOAD .................................. 90
5.1 Download Setup.................................... 90
5.2 Download Procedure ............................ 91
6. SERVICE AND CALIBRATION ...... 98
6.1 Service S/W ...........................................98
7. CIRCUIT DIAGRAM ..................... 101
8. PCB LAYOUT ............................... 107
9. ENGINEERING MODE
10. STANDALONE TEST
10.1 Setting Method ............................... 112
11. EXPLODED VIEW &
REPLACEMENT PART LIST...... 113
12.1 EXPLODED VIEW ............................ 113
12.2 Replacement Parts
<Mechanic component>.................... 115
<Main component> ........................... 118
12.3 Accessory ......................................... 131
....................
111
....................
112