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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION ..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information .........................................................................3
1.3 Abbreviations.............................................................................................5
2. PERFORMANCE ...................................................................... 7
2.1 Product Name ............................................................................................7
2.2 Supporting Standard ..............................................................................7
2.3 Main Parts : GSM Solution .....................................................................7
2.4 HW Features ...............................................................................................8
2.5 SW Features ............................................................................................. 10
2.6 HW SPEC. ................................................................................................. 13
2.7 P768 Figures ............................................................................................ 26
3. CIC AND SERVICE CENTER .................................................. 27
3.1 CIC FAQ ...................................................................................................... 27
4. TROUBLE SHOOTING .......................................................... 44
4.1 RF Component ....................................................................................... 44
4.2 SIGNAL PATH ........................................................................................... 46
4.3 Checking TCXO Block ........................................................................... 49
4.4 Checking WCDMA Block .................................................................... 51
4.5 Checking GSM Block ............................................................................ 57
4.6. GPS/WIFI/BT RF components .......................................................... 63
4.7 GPS/WIFI/BT SIGNAL PATH ................................................................ 65
4.8 Power ON Troubleshooting ............................................................... 67
4.9 Charger Troubleshooting ................................................................... 71
4.10 USB Trouble shooting ....................................................................... 73
4.11 Audio trouble ....................................................................................... 76
4.12 Camera trouble(8M/ 0.3M) .............................................................. 86
4.13 Main LCD trouble ................................................................................ 91
4.14 SIM detect Trouble shooting .......................................................... 94
4.15 Vibrator Troubleshooting ................................................................ 96
4.16 Compass or Accelerometer Sensor on/off trouble ............... 99
4.17 Proximity Sensor on/off trouble .................................................101
4.18 Touch trouble .....................................................................................103
5. DOWNLOAD .......................................................................105
6. BLOCK DIAGRAM ...............................................................125
7. CIRCUIT DIAGRAM ............................................................144
8. BGA PIN MAP ....................................................................159
9. PCB LAYOUT .......................................................................168
10. CALIBRATION ...................................................................178
11. HIDDEN MENU .................................................................198
12. DISASSEMBLE GUIDE ......................................................222
13. EXPLODED VIEW & REPLACEMENT PART LIST .............231