LG KP270 User manual

Service Manual Model : KP270
Service Manual
KP270
Date: October, 2008 / Issue 1.0
Internal Use Only

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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1. INTRODUCTION ...............................5
1.1 Purpose .................................................. 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE...............................8
2.1 Supporting Standard ................................8
2.2 Main Parts: Solution.................................8
2.3 HW Feature..............................................9
2.4 HW Spec................................................11
3. TECHNICAL BRIEF ........................15
3.1 Functional Block Diagram ......................15
3.2 Baseband Processor Introduction..........16
3.3 Power management IC ..........................28
3.4 Power ON/OFF ......................................35
3.5 SIM Interface..........................................36
3.6 MICRO SD connector ............................37
3.7 Memory ..................................................38
3.8 LCD Display ...........................................39
3.9 Keypad switching & scanning ................40
3.10 keypad back-light illumination ..............41
3.11 LCD back-light illumination ..................43
3.12 Battery voltage monitor ........................44
3.13 Audio....................................................45
3.14 BLUETOOTH .......................................48
3.15 18PIN Interface connector ...................51
3.16 General Description .............................52
3.17 GSM Part .............................................55
3.18 WCDMA Part .......................................60
3.19 GSM Power Amplifier Module..............62
3.20 WCDMA Band1 Power Amplifier
Module .................................................63
3.21 WCDMA Band1 Low Noise
Amplifier ..............................................64
3.22 WCDMA Band1 Duplexer ....................65
4. TROUBLE SHOOTING ...................66
4.1 Trouble shooting test setup....................66
4.2 Power on trouble....................................67
4.3 Charging Trouble ...................................70
4.4 UBS Trouble ..........................................73
4.5 SIM Detect Trouble ................................75
4.6 Number Key Sense Trouble...................78
4.7 Multi Key sense Trouble ........................80
4.8 Keypad backlight Trouble ......................82
4.9 Micro SD Trouble ...................................84
4.10 Audio Trouble.......................................86
4.11 Microphone Trouble .............................90
4.12 Camera Trouble ...................................94
4.13 Main LCD Trouble................................97
4.14 Bluetooth Trouble.................................99
4.15 RF Component...................................102
4.16 RF SIGNAL PATH .............................103
4.17 Trouble Shooting of GSM Part...........104
4.18 Trouble Shooting of WCDMA Part .....112
5. DOWNLOAD .....................................118
5.1 USB Driver Installation to Download....118
5.2 Device Detection..................................120
5.3 USB Port Mapping ...............................121
5.4 Configuration to Download...................122
5.5 Nexus setting .......................................124
6. CIRCUIT DIAGRAM ......................125
7. BGM PIN MAP...............................133
8. PCB LAYOUT ................................139
9. RF Calibration ..............................145
9.1 Test Equipment Setup .........................145
9.2 Calibration Step ...................................145
10. EXPLODED VIEW &
REPLACEMENT PART LIST ......151
10.1 Exploded View ...................................151
10.2 Replacement Parts ............................153
10.3 Accessory ..........................................174
Table Of Contents

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LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of the KP270.
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. 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 KP270 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.
D. Maintenance Limitations
Maintenance limitations on the KP270 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.
1. INTRODUCTION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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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
An KP270 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 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.
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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1. INTRODUCTION
1.3 Abbreviations
For the purposes of this manual, following abbreviations apply:
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
APC Automatic Power Control
BB Baseband
BER Bit Error Ratio
CC-CV Constant Current - Constant Voltage
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milliwatt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
EL Electroluminescence
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
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
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
RLR Receiving Loudness Rating
RMS Root Mean Square
RTC Real Time Clock
FEM Front End Module
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

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
2. PERFORMANCE
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2.1 Supporting Standard
2.2 Main Parts: Solution
Item Feature Comment
Supporting Standard WCDMA 2100
EGSM900/DCS1800/PCS1900 with
seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, A-E
Frequency Range EGSM900 TX : 880 - 915 MHz
EGSM900 RX : 925 - 960 MHz
DCS1800 TX : 1710 - 1785 MHz
DCS1800 RX : 1805 - 1880 MHz
PCS1900 TX : 1850 - 1910 MHz
PCS1900 RX : 1930 - 1990 MHz
WCDMA2100 TX : 1920 - 1980 MHz
WCDMA2100 RX : 2110 - 2170 MHz
Application Standard WAP 2.0, JAVA 2.0
Item Part name Comment
Digital Baseband PMB8868 (Infineon)
Analog Baseband PMB8868 (Infineon)
RF chip PMB6952 (Infineon)

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2.3 HW Feature
Item Feature Comment
Form Factor Slide type
Battery 1) Capacity
Standard : Li-Ion, 900mAh
2) Packaging Type : Soft Pack
Size 98 x 48 x 16.9 mm
Weight 98 g With Battery
GSM 200hours @paging period 5
WCDMA 210 hours @DRX=1.28
GSM 160min @ Power Level 7
WCDMA 160min @Tx=12dBm
Charging time 3 hours @power OFF/900mAh
RX sensitivity EGSM900 : -105 dBm
DCS1800 : -105 dBm
PCS1900 : -105 dBm
PCS1900 : -105 dBm
WCDMA2100 : -106.7 dBm
EGSM900 : 33 dBm Class4 (EGSM900)
DCS1800 : 30 dBm Class1(DCS)
PCS1900 : 30 dBm Class1(PCS)
EGSM900 : 27 dBm E2 (EGSM900)
DCS1800 : 26 dBm E2 (DCS)
PCS1900 : 26 dBm E2 (PCS)
GPRS compatibility GPRS Class 12
EDGE compatibility EDGE Class 12
Display Main LCD(2”, 176 x 220)/TFT
Built-in Camera 1.3 Mega pixel
ANT Main : Internal Fixed Type
System connector 18 Pin
Ear Phone Jack 18pin, 4 Pole, Stereo
PC synchronization Yes
TX output
power
GSM/
GPRS
EDGE
Stand-by
time
Talk time

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
Speech coding FR, EFR, HR, AMR
Vibrator Built in Vibrator
Blue Tooth V1.2, A2DP
Voice Recording Yes
Speaker Phone mode Yes
Support
Travel Adapter Yes
CDROM Yes
Stereo Headset Yes
Data Cable No
T-Flash Yes Not Equipped

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2.4 HW Spec.
2.4.1 GSM Transmitter/Receiver spec.
Item Specification
1Frequency Band EGSM900
TX : 880 - 915 MHz
RX : 925 - 960 MHz
DCS1800
TX : 1710 - 1785 MHz
RX : 1805 - 1880 MHz
PCS1900
TX : 1850 - 1910 MHz
RX : 1930 - 1990 MHz
2Phase Error Rms : 5°
Peak : 20°
3Frequency Error GSM : 0.1 ppm
DCS/PCS : 0.1 ppm
4EMC(Radiated Spurious GSM/DCS : < -28dBm
Emission Disturbance)
5Transmitter Output power and GSM : 5dBm - 33dBm 3dB
Burst Timing DCS/PCS : 0dBm - 30dBm 3dB
6Burst Timing < 3.69us
7Spectrum due to modulation out 200kHz : -36dBm
to less than 1800kHz offset 600kHz : -51dBm/-56dBm
8Spectrum due to modulation out GSM
to larger than 1800kHz offset to 1800-3000kHz :< -63dBc(-46dBm)
the edge of the transmit band 3000kHz-6000kHz : <-65dBc(-46dBm)
6000kHz < : < -71dBc(-46dBm)
DCS
1800-3000kHz :< -65dBc(-51dBm)
6000kHz < : < -73dBc(-51dBm)