Service Manuals, User Guides, Schematic Diagrams or docs for : LG Mobile Phone LG KG920 LG KG920
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kg920 cover 2006.5.15 10:6 AM ` 1
Service Manual
Service Manual
KG920
Model : KG920
Date: April, 2006 / Issue 1.0
Table Of Contents
1. INTRODUCTION...................................5 4.12 Camera Trouble.....................................108
1.1 Purpose ..................................................... 5 4.13 Speaker Trouble ....................................120
1.2 Regulatory Information ............................... 5 4.14 Headphone Trouble ...............................122
1.3 Abbreviations .............................................. 7 4.15 Receiver Trouble ...................................124
4.16 Microphone Trouble...............................126
2. PERFORMANCE ..................................9
5. DOWNLOAD AND CALIBRATION...128
2.1 H/W Features...............................................9
2.2 Technical Specification ..............................18 5.1 Download.................................................128
5.2 Calibration................................................134
3. TECHNICAL BRIEF............................23
6. BLOCK DIAGRAM ...........................140
3.1 Transceiver (SI4210) .................................23
3.2 PAM (SKY77328) ..................................... 27 7. Circuit Diagram................................141
3.3 26 26 MHz Clock (VCTCXO) .....................28
3.4 Power Supplies for RF Circuits (RF LDO) .28 8. pcb layout ........................................149
3.5 Digital Main Processor (AD6527B) ............30
3.6 Analog Main & Power Management 9. ENGINEERING MODE .....................157
Processor (AD6535) ..................................36
9.1 About Engineering Mode .........................157
3.7 Battery Charging Block ..............................43
9.2 Access Codes..........................................157
3.8 MUMTI-MEDIA INTERFACE .....................47
9.3 Key Operation..........................................157
3.9 MIDI IC(YMU787) ......................................59
9.4 Engineering Mode Menu Tree .................157
3.10 MEMORY
9.5 BB Test [MENU 1] ...................................158
(512Mbits NOR + 128Mbits PSRAM) ......63
9.6 RF Test [MENU 2] ...................................160
3.11 Keypad Switches and Scanning ..............66
9.7 MF mode [MENU 3] .................................160
3.12 Main Microphone .....................................68
9.8 Trace option [MENU 4] ............................161
3.13 Main Receiver..........................................69
9.9 Call timer [MENU 5] .................................161
3.14 Headset Interface ....................................70
9.10 Fact. Reset [MENU 6]............................162
3.15 BLUETOOTH(LBMA-2C67B2) ................71
9.11 S/W version [MENU 7]...........................162
3.16 Mini-SD ....................................................72
9.12 MM S/W Download [MENU 8] ...............162
3.17 FLIP SWITCH ..........................................73
3.18 VIBRATOR ..............................................74 12. EXPLODED VIEW & REPLACEMENT
3.19 Audio CODEC..........................................74 PART LIST ..................................... 163
3.20 KEY backlight ..........................................75
12.1 Exploded View ...................................... 163
4. TROUBLE SHOOTING.......................76 12.2 Replacement Parts ................................165
4.1 RF Component ..........................................76 12.3 Accessory ............................................. 194
4.2 BT Trouble .................................................86
4.3 Power On Trouble......................................89
4.4 Charging Trouble .......................................91
4.5 Vibrator Trouble .........................................93
4.6 SIM Card Trouble ......................................95
4.7 KEY backlight Trouble ...............................97
4.8 Side KEY backlight Trouble (SUB board) ..99
4.9 RTC Trouble ............................................101
4.10 Swivel Trouble .......................................103
4.11 LCD Trouble ..........................................105
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1. INTRODUCTION
1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of this model.
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company"s employees, agents, subcontractors, or person working on your
company"s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system. There are may be risks of toll fraud
associated with your telecommunications system. System users are responsible for programming and
configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this
product is immune from the above case but will prevent unauthorized use of common-carrier
telecommunication service of facilities accessed through or connected to it.
The manufacturer will not be responsible for any charges that result from such unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone
service until repair can be done. A telephone company may temporarily disconnect service as long as
repair is not done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the this phone or compatibility with the
network, the telephone company is required to give advanced written notice to the user, allowing the
user to take appropriate steps to maintain telephone service.
D. Maintenance Limitations
Maintenance limitations on this model must be performed only by the manufacturer or its authorized
agent. The user may not make any changes and/or repairs expect as specifically noted in this manual.
Therefore, note that unauthorized alternations or repair may affect the regulatory status of the any
remaining warranty.
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1. INTRODUCTION
E. Notice of Radiated Emissions
This model complies with rules regarding radiation and radio frequency emission as defined by local
regulatory agencies. In accordance with these agencies, you may be required to provide information
such as the following to the end user.
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.
G. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from
unsuppressed engines or electric motors may cause problems.
H. Electrostatic Sensitive Devices
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign.
Following information is ESD handling:
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