Table Of Contents - LG U970 Service Manual

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 ...........................................15
2.7 Sound Pressure Level............................16
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...25
3.5 Off-chip RF Components .......................25
3.6 Digital Baseband(DBB/MSM6280).........34
3.7 Hardware Architecture ...........................35
3.8. Subsystem(MSM6280) .........................37
3.9. Power Block ..........................................45
3.10. External memory interface ..................50
3.11. H/W Sub System.................................52
3.12 Main Features ......................................72
4. TROUBLE SHOOTING ...................77
4.1 RF CRF Component ..............................77
4.2 SIGNAL PATH_UMTS RF .....................79
4.3 SIGNAL PATH_GSM RF .......................80
4.4 Checking VCTCXO Block ......................81
4.5 Checking Front-End Module Block ........83
4.6 Checking UMTS Block ...........................85
4.7 Checking GSM Block .............................90
4.8 Checking Bluetooth Block ......................96
4.9 Power ON Troubleshooting....................98

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4.10 Charger Troubleshooting .....................99
4.11 USB Troubleshooting.........................103
4.12 SIM Detect Troubleshooting ..............106
4.13 Camera Troubleshooting ...................108
4.14 Keypad Backlight Troubleshooting ....110
4.15 Folder ON/OFF Troubleshooting .......112
4.16 Main LCD Troubleshooting ................114
4.17 Receiver Path ....................................115
4.18 Headset path......................................117
4.19 Speaker phone path...........................119
4.20 Main microphone ...............................121
4.21 Headset microphone..........................123
4.22 Vibrator ..............................................124
5. DOWNLOAD .................................125
5.1 U970DOWNLOAD ...............................125
5.2 KU970 S/W Download .........................140
6. BLOCK DIAGRAM ........................158
6.1 GSM & UMTS RF Block.......................158
6.2 Interface Diagram ................................160
7. Circuit Diagram ............................167
8. pcb layout .....................................176
9. Calibration & RF Auto
Test Program ................................183
9.1 Configuration of HOT KIMCHI .............183
9.2 How to use HOT KIMCHI.....................186
10. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 189
10.1 EXPLODED VIEW ............................ 189
10.2 Replacement Parts
<Mechanic component>.................... 191
<Main component> ........................... 194
10.3 Accessory ......................................... 209