LG MG220, Service Manual

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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 .................. 45
4.1 Main Components Placement............... 45
4.2 FPCB Components Placement ............. 46
4.3 Baseband Components ........................ 46
4.4 Main Components (Description) ........... 47
4.5 Power On Trouble................................. 48
4.6 Charging Trouble .................................. 49
4.7 LCD Display Trouble............................. 51
4.8 Camera Trouble .................................... 53
4.9 Receiver Trouble................................... 55
4.10 Microphone Trouble ............................ 59
4.11 Vibrator Trouble .................................. 62
4.12 Keypad Backlight Trouble ................... 64
4.13 Folder ON/OFF Trouble ...................... 66
4.14 SIM Detect Trouble ............................. 68
4.15 Earphone Trouble ............................... 70
4.16 RF Rx pass Trouble Shooting..............74
4.17 RF Tx pass Trouble Shooting ..............81
5. DOWNLOAD .................................. 89
5.1 Download Setup.................................... 89
5.2 Download Procedure ............................ 90
6. SERVICE AND CALIBRATION ...... 97
6.1 Service S/W ...........................................97
7. CIRCUIT DIAGRAM ....................... 99
8. PCB LAYOUT ............................... 107
9. ENGINEERING MODE .................... 109
10. STANDALONE TEST .................... 110
10.1 Setting Method ............................... 110
11. EXPLODED VIEW &
REPLACEMENT PART LIST ...... 111
11.1 EXPLODED VIEW ............................ 111
11.2 Replacement Parts
<Mechanic component>.................... 113
<Main component> ........................... 116
11.3 Accessory ......................................... 127
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