LG KM555 User manual

Service Manual Model : KM555
Internal Use Only
Service Manual
KM555
Date: November, 2009 / Issue 1.0

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Copyright © 2009 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
1.3 Abbreviation................................................................7
2. performance................................................... 9
2.1 Supporting Standard....................................................9
2.2. Main Parts .................................................................9
2.3 H/W features.............................................................10
2.4 HW Spec. .................................................................12
3. BB Circuit Technical brief............................ 18
3.1 Functional Block Diagram ..........................................18
3.2 Baseband Processor Introduction ...............................19
3.3 Power management IC...............................................33
3.4. Power ON/OFF .........................................................40
3.5 SIM Interface.............................................................41
3.6 T - Flash connector....................................................42
3.7 Memory ....................................................................43
3.8 LCD Display ..............................................................44
3.9 keypad back-light illumination ....................................45
3.10 LCD back-light illumination ......................................46
3.11 Battery voltage monitor............................................48
3.12 Audio......................................................................49
3.13 WLAN/Bluetooth/FM (RWFS-B971A).........................52
3.14 5PIN Interface connector..........................................55
4. RF Circuit Technical Brief ............................ 56
4.1 General Description ...................................................56
4.2 GSM Part..................................................................59
4.3 WCDMA Part.............................................................63
4.4 GSM Power Amplifier Module.....................................66
4.5 WCDMA Band1/8 Power Amplifier Module ..................67
4.6 WCDMA Band1/8 Low Noise Amplifier........................68
4.7 WCDMA Band1 Duplexer ...........................................69
4.8 WCDMA Band8 Duplexer ...........................................70
5. Trouble shooting .......................................... 71
5.1. Trouble shooting test setup........................................71
5.2. Power on trouble ......................................................72
5.3 Charging Trouble .......................................................75
5.4 SIM Detect Trouble ....................................................77
5.5 Three-KEY backlight Trouble.......................................80
5.6 Micro SD Trouble.......................................................81
5.7 Audio Trouble ............................................................83
5.8 Microphone Trouble ...................................................89
5.9 3M Camera Trouble ...................................................93
5.10 Main LCD Trouble ....................................................95
5.11 Touch Sensor ..........................................................97
5.12 WiFi /Bluetooth Trouble ............................................99
6. Download & S/W upgrade .........................104
7. Block diagram............................................115
8. Circuit Diagram.......................................... 117
9. BGA Pin Map .............................................. 123
10. PCB Layout............................................... 127
11. RF Calibration .......................................... 129
11.1 Test Equipment Setup ............................................129
11.2 Calibration Step.....................................................129
12. Exploded view & Replacement part list .135
12.1 Exploded view .......................................................135
12.2 Replacement Parts ................................................137
12.3 Accessory .............................................................159

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Introduction
1. Introduction
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INTRODUCTION
1.1.Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of the KM555.
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 might be risks of toll fraud associated with your telecommunications system. System users are
responsible for programming and configuring the equipment to prevent unauthorized use. LGE 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. LGE 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 KM555 or compatibility with the net
work, the telephone company is required to give advanced written notice to the user, allowing the user
to take appropriate steps to maintain telephone service.

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. Introduction
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D. Maintenance Limitations
Maintenance limitations on the KM555 must be performed only by the LGE 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 system
and may void any remaining warranty.
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
KM555 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:
• Service personnel should ground themselves by using a wrist strap when exchange system boards.
• When repairs are made to a system board, they should spread the floor with anti-static mat which is
also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective package as
described.

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Introduction
1. Introduction
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1.3. ABBREVIATION
For the purposes of this manual, following abbreviations apply:
୛APC Automatic Power Control
୛BB Baseband
୛BER Bit Error Ratio
୛CC-CV Constant Current – Constant Voltage
୛CLA Cigar Lighter Adapter
୛DAC Digital to Analog Converter
୛DCS Digital Communication System
୛dBm dB relative to 1 milli-watt
୛DSP Digital Signal Processing
୛EEPROM Electrical Erasable Programmable Read-Only Memory
୛EGPRS Enhanced General Packet Radio Service
୛EL Electroluminescence
୛ESD Electrostatic Discharge
୛FPCB Flexible Printed Circuit Board
୛GMSK Gaussian Minimum Shift Keying
୛GPIB General Purpose Interface Bus
୛GPRS General Packet Radio Service
୛GSM Global System for Mobile Communications
୛IPUI International Portable User Identity
୛IF Intermediate Frequency
୛LCD Liquid Crystal Display
୛LDO Low Drop Output
୛LED Light Emitting Diode
୛LGE LG Electronics
୛OPLL Offset Phase Locked Loop
୛PAM Power Amplifier Module
୛PCB Printed Circuit Board
୛PGA Programmable Gain Amplifier
୛PLL Phase Locked Loop
୛PSTN Public Switched Telephone Network
୛RF Radio Frequency
1.3 Abbreviation

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. Introduction
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୛RLR Receiving Loudness Rating
୛RMS Root Mean Square
୛RTC Real Time Clock
୛SAW Surface Acoustic Wave
୛SIM Subscriber Identity Module
୛SLR Sending Loudness Rating
୛SRAM Static Random Access Memory
୛STMR Side Tone Masking Rating
୛TA Travel Adapter
୛TDD Time Division Duplex
୛TDMA Time Division Multiple Access
୛UART Universal Asynchronous Receiver/Transmitter
୛VCO Voltage Controlled Oscillator
୛VCTCXO Voltage Control Temperature Compensated Crystal
Oscillator
୛WAP Wireless Application Protocol
୛8PSK 8 Phase Shift Keying

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. Performance
2. Performance
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2. PERFORMANCE
2.1. Supporting Standard
Item Feature Comment
Supporting Standard WCDMA 900 / WCDMA
2100/HSDPA
GSM850/EGSM/DCS/PCS1 with
seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 3
Frequency Range GSM850 TX : 824 - 849MHz
GSM850 RX : 869 - 894MHz
EGSM TX : 880 - 915 MHz
EGSM RX : 925 - 960 MHz
DCS TX : 1710 - 1785 MHz
DCS RX : 1805 - 1880 MHz
PCS TX : 1850 - 1910 MHz
PCS RX : 1930 - 1990 MHz
WCDMA900 TX : 880 - 915 MHz
WCDMA900 RX : 925 - 960 MHz
WCDMA2100 TX : 1920 - 1980 MHz
WCDMA2100 RX : 2110 - 2170 MHz
HSDPA TX : 880 - 915 MHz
1920 - 1980 MHz
HSDPA RX : 925 - 960 MHz
2110 - 2170 MHz
WLAN 802.11g : 2400 – 2483.5 MHz
Application Standard WAP 2.0, JAVA 2.1
2.2. Main Parts : Solution
Item Part name Comment
Digital Baseband PMB8878 (Infineon)
Analog Baseband PMB8878 (Infineon)
RF chip TQ7M5005H (TriQuent))

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. Performance
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2.3. H/W features
Item Feature Comment
Form Factor Color LCD – Bar Type
Battery
1)Capacity
Standard : Li-Ion, 950mAh
2) Packaging Type : Soft Pack
Item Feature Comment
Size 105.9 × 53.4 × 11.95mm
Weight 105g With Battery
Stand-by
time
GSM 227 hours @paging period 5
WCDMA 227hours @DRX=7
Talk
time
GSM 170min @ Power Level 5
WCDMA 170min @Tx=12dBm
Charging time 2hours 20min @power
OFF/1000mAh
Rx sensitivity EGSM900 : -105 dBm
DCS1800 : -105 dBm
PCS1900 : -105 dBm
WCDMA2100 : -106.7 dBm
TX output
power
GSM/
GPRS
EGSM900 : 32 dBm
DCS1800 : 30 dBm
PCS1900 : 29.5 dBm
Class4 (EGSM900)
Class1(DCS)
Class1(PCS)
EDGE EGSM900 : 27 dBm
DCS1800 : 26 dBm
PCS1900 : 26 dBm
E2 (EGSM900)
E2 (DCS)
E2 (PCS)
GPRS compatibility GPRS Class 12
EDGE compatibility EDGE Class 12
Display Main LCD(3”, 480 x 800)/TFT
Built-in Camera 3 Mega pixel
ANT Main : Internal Fixed Type

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. Performance
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Only for training and service purposes
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System connector 5 Pin
Ear Phone Jack ĭ3.5 4 Pole, Stereo
PC synchronization Yes
Speech coding FR, EFR, HR, AMR
Vibrator Built in Vibrator
Bluetooth V2.1 with A2DP
Voice Recording Yes
Speaker Phone
mode Support
Yes
Travel Adapter Yes
CDROM No
Stereo Headset Yes
Data Cable No
T-Flash Yes Not Equipped