LG KC550 Service Manual.pdf

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KC550 SVC ENG_0528
Internal Use Only
Service Manual
KC550
Date: May, 2008 / Issue 1.0
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REVISED HISTORY
Editor
Date
Issue
Contents of Changes
S/W Version
Y.W.YUN
5/26
0.1
* The information in this manual is subject to change without notice and should not be construed as a
commitment by LGE Inc. Furthermore, LGE Inc. reserves the right, without notice, to make changes to
equipment design as advances in engineering and manufacturing methods warrant.
* This manual provides the information necessary to install, program, operate and maintain the KC550.
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 3 -
LGE Internal Use Only
142281035.003.png
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 4 -
 
Table Of Contents
1. INTRODUCTION ...............................7
1.1 Purpose .................................................. 7
1.2 Regulatory Information............................ 7
1.3 ABBREVIATION ..................................... 9
6. Trouble shooting............................84
6.1 Trouble shooting test setup....................84
6.2 Power on Trouble...................................85
6.3 Charging trouble ....................................88
6.4 LCD display trouble................................90
6.5 Camera Trouble .....................................93
6.6 Receiver & Speaker trouble ...................95
6.7 Microphone trouble ................................97
6.8 Ear-MIc Jack Detection trouble..............98
6.9 Vibrator trouble ......................................99
6.10 Keypad back light trouble...................100
6.11 SIM & uSD trouble .............................103
6.12 RF Troubleshooting ...........................106
6.13 RF Receiver path Troubleshooting ....110
6.14 RF Transmitter path Troubleshooting 113
2. GENERAL PERFORMANCE ..........11
2.1 H/W Features.........................................11
2.2 Technical specification...........................12
3. TECHNICAL BRIEF ........................19
3.1 KC550 Component Block diagram.........19
3.2 Main Chip Introduction ...........................20
3.3 Baseband Part Introduction ...................22
3.4 Power Management Unit .......................38
3.5 Power ON/OFF ......................................43
3.6 SIM interface..........................................47
3.7 Memory ..................................................48
3.8 LCD Display ...........................................50
3.9 Keypad Switching & Scanning ...............53
3.10 Keypad back-light illumination .............54
3.11 LCD back-light illumination ..................55
3.12 JTAG interface connector ....................57
3.13 Audio....................................................58
3.14 USB charging circuit ............................62
3.15 BLUETOOTH .......................................63
3.16 FM Radio..............................................66
3.17 Micro SD external memory card slot....67
3.18 18pin Multi Media Interface
connector .............................................69
7. Download & S/W upgrade...............118
7.1 Download program user guide.............118
7.2 Multi-Download Program Setting .........119
8. CIRCUIT DIAGRAM ......................121
9. BGM PIN MAP...............................131
10. PCB LAYOUT ..............................137
11. RF Calibration.............................145
11.1 Test Equipment Setup .......................145
11.2 Calibration Step .................................145
4. RF circuit technical brief ...............71
4.1 General Description ...............................71
4.2 Receiver part..........................................73
4.3 Transmitter part......................................74
4.4 RF synthesizer .......................................75
4.5 DCXO.....................................................76
4.6 Front End Module control.......................76
4.7 Power Amplifier Module .........................77
4.8 Mode Selection ......................................78
12. Stand-alone Test ........................151
12.1 Test Program Setting .........................151
12.2 Tx Test ...............................................153
12.3 Rx Test...............................................154
13. ENGINEERING MODE ................155
14. EXPLODED VIEW &
REPLACEMENT PART LIST ......157
14.1 Exploded View ...................................157
14.2 Replacement Parts ............................159
14.3 Accessory ..........................................182
5. PCB layout......................................79
5.1 Main PCB component placement ..........79
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 5 -
LGE Internal Use Only
 
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 6 -
 

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