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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION...............................................5
1.1 Purpose......................................................................5
1.2 Regulatory Information.................................................5
2. PERFORMANCE............................................... 7
2.1 System Overview.........................................................7
2.2 Usable environment.....................................................8
2.3 Radio Performance......................................................8
2.4 Current Consumption.................................................14
2.5 RSSI BAR..................................................................14
2.6 Battery BAR ..............................................................14
2.7 Sound Pressure Level ................................................15
2.8 Charging...................................................................16
3. TECHNICAL BRIEF......................................... 17
3.1 General Description ...................................................17
3.2 GSM Mode................................................................19
3.3 UMTS Mode..............................................................23
3.4 LO generation and distribution circuits........................26
3.5 Off-chip RF Components............................................26
3.6 Digital Baseband (MSM6280).....................................42
3.7 Subsystem(MSM6280) ..............................................44
3.8 Power Block..............................................................51
3.9 External memory interface .........................................56
3.10 H/W Sub System .....................................................58
3.11 MAIN Features ........................................................74
4. TROUBLE SHOOTING..................................... 79
4.1 RF Component Description.........................................79
4.2 WCDMA RF Signal Path .............................................80
4.3 GSM RF Signal Path ..................................................81
4.4 Checking VCTCXO Block ............................................82
4.5 Checking Front-End Module Block..............................85
4.6 Checking WCDMA Block ............................................87
4.7 Checking GSM Block .................................................94
4.8 Checking Bluetooth Block ........................................100
4.9 Power ON Troubleshooting .......................................103
4.10 Charger Troubleshooting ........................................105
4.11 USB Troubleshooting..............................................107
4.12 USIM Detect Troubleshooting..................................108
4.13 Camera Troubleshooting ........................................110
4.14 Keypad Backlight Troubleshooting...........................112
4.15 LCD Troubleshooting..............................................114
4.16 Receiver Path........................................................115
4.17 Headset path.........................................................117
4.18 Speaker phone path ..............................................119
4.19 Main microphone ..................................................121
4.20 Headset microphone..............................................123
4.21 Vibrator.................................................................125
4.22 Checking DVB-T/H Block( The DVB-T/H function is for
KB770 )................................................................126
5. DOWNLOAD & S/W UPGRADE..................... 131
6. BLOCK DIAGRAM........................................146
7. CIRCUIT DIAGRAM...................................... 157
8. BGA PIN MAP.............................................. 167
9. PCB LAYOUT ...............................................171
10. CALIBRATION............................................177
10.1 USAGE OF HOT-KIMCHI .........................................177
11. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................. 181
11.1 EXPLODED VIEW ...................................................181
11.2 Replacement Parts ................................................183
11.3 Accessory .............................................................207
