LG KP151Q User manual

Service Manual Model : KP151Q
Service Manual
KP151Q
Date: September, 2008 / Issue 1.0
Internal Use Only

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LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 KP151Q.
REVISED HISTORY
Date Issue Contents of Changes S/W Version

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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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LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. Introduction ..................................... 7
1.1 Purpose................................................... 7
1.2. Regulatory Information........................... 7
1.3 Abbreviations .......................................... 9
2. General Performance.................... 10
2.1 Product Name ....................................... 10
2.2 Supporting Standard ............................. 10
2.3 Main Parts: GSM Solution..................... 10
2.4 HW Feature........................................... 11
2.5 S/W Features .........................................13
3. HW Circuit Description................. 16
3.1 Digital Main Processor (Locosto) .......... 16
3.2 Power Amplifier Module (SKY77318) ... 22
3.3 26 MHz Clock (DCXO).......................... 23
3.4 RTC(32.768KHz Crystal) ...................... 24
3.5 LCD Interface(8-bit Parallel interface)... 25
3.6 SIM Card Interface.................................26
3.7 KEYPAD Interface .................................27
3.8 Battery Charging Block Interface ...........28
3.9 RF Interface ...........................................29
3.10 Audio Interface.....................................31
3.11 Key LED Interface................................34
3.12 Vibrator Interface .................................35
3.13 Memory Interface .................................36
3.14 Power Block Interface ..........................37
3.15 FM RADIO INTERFACE ......................39
3.16 Camera INTERFACE...........................41
4. TROUBLE SHOOTING .................. 42
4.1 Trouble Test Set-up ...............................42
4.2 RF Part Component ...............................43
4.3 RX Receiver Part ...................................46
4.4 TX Transmitter Part................................49
4.5 Power On Trouble..................................54
4.6 Charging Trouble ...................................56
4.7 RTC Trouble ..........................................58
4.8 LCD Trouble...........................................59
4.9 Speaker & Receiver Trouble..................61
4.10 Headphone Trouble .............................64
4.11 Microphone Trouble .............................66
4.12 SIM Card Trouble.................................68
4.13 KEY backlight Trouble .........................70
4.14 Vibrator Trouble ...................................72
4.15 FM RADIO Trouble ..............................74
4.16 Camera Trouble ...................................76
5. DOWNLOAD .................................. 78
5.1 Download Setup.................................... 78
5.2 Download Procedure ............................ 79
6. BLOCK DIAGRAM ......................... 86
7. CIRCUIT DIAGRAM ....................... 87
8. BGA IC Pin Check ..........................93
9. PCB LAYOUT................................. 97
10. Calibration ....................................... 101
10.1 What’s the Rx Calibration?.............. 101
10. 2 What’s the Tx Calibration? ............. 101
10.3 Calibration program-HOT_KIMCHI ..102
10.4 Calibration Setting............................103
10.5 Calibration Steps..............................103
11. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 109
11.1 EXPLODED VIEW ............................ 109
11.2 Replacement Parts
<Mechanic component>.................... 111
<Main component> ............................114
11.3 Accessory ......................................... 127
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

1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of the KP151Q.
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 you’re 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 KP151Q 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 the KP151Q 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.
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1. Introduction
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
The KP151Q 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 KP151Q 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
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1.3 Abbreviations
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
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. General Performance
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2. General Performance
2.1 Product Name
KP151Q : Support GSM/GPRS
2.2 Supporting Standard
2.3 Main Parts: GSM Solution
Item Feature Comment
Supporting Standard EGSM/GSM850/DCS/PCS
Quad-Band (850/900/1800/1900)
with seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1,2,3
Frequency Range GSM850 TX : 824.2 - 848.8
GSM850 RX : 869.2 - 893.8
EGSM TX : 880.2 - 914.8 MHz
EGSM RX : 925.2 - 959.8 MHz
DCS1800 TX : 1710.2 - 1784.8 MHz
DCS1800 RX : 1805.8 - 1879.8 MHz
PCS1900 TX : 1850.2 - 1909.8 MHz
PCS1900 RX : 1930.2 - 1989.8 MHz
Application Standard SMS : Yes
KP151Q
Digital Baseband TI Locosto(D6591B)
RF Chip SKY77318

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2. General Performance
2.4 HW Feature
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
Form Factor Folder type LCD : 65K CSTN, 128 x128
Battery Capacity
Standard: Li-Ion, 800mAh(Min)
Packing Type: Soft Pack
Size Standard: 88 x 47 x 18.7 mm L x W x H
Weight 80.3g With Battery
PCB One PCB :6 Layers, 0.8t
AVG TCVR Max : 225 mA (GSM, Power Level 5)
current (mA) Max : 90 mA (GSM, Power Level 19)
Standby Current 1.5 mA @ Paging Period 6
Standby time 500 hours @ Paging Period 6
Charging time Below 3 hours @ Power Off /800mAh
Talk time Min : 3.5hr@Power Level 5(GSM850) @ 800 mAh
Min : 4.5hr@Power Level 0(PCS)
RX sensitivity GSM 850 : -108 dBm Condition: conducted
DCS/PCS : -108 dBm
TX output power GSM 850 : 32.5 dBm Class4 (GSM850)
DCS/PCS : 29.5 dBm Class1 (PCS)
SIM card type Plug-In SIM 3V
Display MAIN LCD : 65K Color CSTN (128 X128)
Backlight : White LED
Keypad Alphanumeric Key : 12 Function Key:
Function Key : 10 5 Key Navigation,
5 Key Navigation, F1, F2, C, SND, END/PWR
Antenna Internal Antenna Quad-band

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2. General Performance
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
System connector 18 Pin
Ear Phone Jack 18 Pin
PC synchronization No
Memory Flash : 128Mbit / SRAM : 64Mbit Spansion
Speech coding FR, EFR, HR, AMR
Data & Fax Yes
Vibrator Built in Vibrator
MIDI (for Buzzer SW Decoded 16Poly
Function)
Voice Recording Yes 30 sec.
Travel Adapter Yes
Options Ear-Microphone TBD
Data Cable TBD

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2. General Performance
2.5 S/W Features
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
RSSI 0~5 level
Battery Charging 0~3 level
Key Volume 0~7 level
Effect sound volume 0~7 level
Audio Volume 0~7 level
Time / Date Display Yes NITZ
Multi-language Yes English /Spanish /Portuguese
Quick Access Mode Yes U:Downloads, D:Phonebook
L:Tons&Images, R:Message
PC Sync Yes
Speed Dial Yes (2~9) Voice mail center -> 1 key
Speaker Phone Yes
CLIP / CLIR Yes
Phone Book Yes Total 500 members
Last Dial Number Yes (40)
Last Received Number Yes (40)
Last Missed Number Yes (40)
Search Number/Name Name only
Group Yes Possible Rename
Fixed Dial Number Yes
Service Dial Number Yes
Own Number Yes
Voice Memo Yes
Call Reminder Yes
Network Selection Yes

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
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2. General Performance
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Item Feature Comment
Call Divert Yes
Call Barring Yes
Call Charge (AoC) Yes
Call Duration Yes
SMS Yes Max 100
EMS melody/Picture Yes
Send/ Receive/ Save
SMS Over GPRS No
E-Mail No
Long Message Yes Max. 1530 Characters
Cell Broadcast Yes
Download Melody / Yes
Wallpaper
Game Yes
Calendar Yes
Memo Pad Yes
World Clock Yes
Unit Convert Yes
Fax & Data Built in Data & Fax support
Wall Paper Yes
WAP Browser Yes
Download Yes
SIM Lock Yes Operator Dependen
SIM Toolkit Class 1, 2, 3
MMS MMS
EONS Yes

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2. General Performance
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
CPHS Yes
ENS Yes
Conference Call Yes DTMF
DTMF Yes

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Only for training and service purposes
3. H/W Circuit Description
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3. HW Circuit Description
3.1 Digital Main Processor (Locosto)
Figure. 3-1 Locosto FUNCTIONAL BLOCK DIAGRAM

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. HW Circuit Description
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3.1.1 Overview of Locosto
The Locosto is a GSM base band modem including RF transceiver covering the low bands GSM850
/GSM900 and high bands GSM1800/GSM1900 bands. Locosto is Dual Band, therefore, it supports by
default a low / high pair of bands at the same time:
1. GSM850 / GSM1800
2. GSM850 / GSM1900
3. GSM900 / GSM1800
4. GSM900 / GSM1900
The Locosto is optimized for voice-centric Mobile Phone applications.
The Locosto is designed as a single chip solution that integrates the digital, mixed-signal, RF
functionality and a direct-to-battery Power Management Unit.
The transceiver consists of:
• Constant gain direct conversion receiver with an analog I/Q base band interface
• Fully integrated Sigma/Delta-synthesizer capability
• Fully integrated two-band RF oscillator
• Two-band digital GMSK modulator with digital TX interface
• Digitally controlled crystal oscillator generating system clocks.
The Locosto supports a direct battery connection, hence eliminating the need for an external Power
Management Unit. The Locosto has different power down modes and an integrated power up
sequencer.
The Locosto is powered by the ARM7(104MHz) MCU and C54® DSP cores.
The operating temperature range from -40°C to 85°C. It is manufactured using the 0.13 µm CMOS
process.

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. HW Circuit Description
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3.1.2 Features
The LOCOSTO device is an integrated solution that embeds a digital baseband(DBB) and a digital
radio processor (DRP) on the same die. The LOCOSTO device targets solutions for GSM/GPRS (low-
cost global system for mobile communications/general packet radio service).
The DRP is a digital radio-frequency (RF) transceiver that supports up to a GPRS class12. The DRP is
designed for quad-band operation, supporting both the European and the US bands (E-GSM 900 and
DCS 1800 bands, GSM850 and PCS 1900 bands, respectively).
The DBB supports the processing of GSM radio signals in the switching circuit mode and the packet
data mode (GPRS) for up to class 10, including evolutions such as the SAIC and localization system
(A-GPS) in compliance with the European Telecommunications Standards Institute specification.
The LOCOSTO silicon process is a 90-nm digital CMOS technology.
The LOCOSTO device includes two versions: LOCOSTO and LOCOSTO Lite.
The LOCOSTO Lite device does not include the camera interface and the GPRS.
LOCOSTO offers the following features:
■ Dual processors:
- 104-MHz ARM7TDMI® microprocessor unit (MPU)
- 104-MHz customized digital signal processor (cDSP) c54x
■ Internal memory:
- 154KW DSP read-only memory (ROM)
- 30KW DSP static random-access memory (SRAM)
- 2.5Mb MPU SRAM
- 1.5Mb MPU ROM
■ External memory support:
- 1.8/3 V subscriber identity module (SIM) I/F
- Direct memory access (DMA) to external memory
- Burst mode, page-mode external memory: NAND and NOR flash and SRAM (frame buffer)
■ Hardware security
- Flash content
- International mobile equipment identity (IMEI) protection
- SIM lock

■ Peripheral interfaces
- Vibrator PWM control signal
- Universal serial bus (USB) 2.0 full-speed client
- Keypad
- Universal asynchronous receiver/transmitter (UART)
- Multichannel serial interface (MCSI)
- Bluetooth
- Camera
- Primary liquid-crystal display (LCD): 8-bit parallel interface Up to QVGA (quarter video graphics
array) 256K colors
- Secondary LCD: Serial interface
■ DRP2.0 RF integrated RF:
- Digital RF 4 band GSM/GPRS up to Class 12 (On the LOCOSTO Lite device, GSM is dual-band
muxed and GPRS is not available.)
- -110 dBm sensitivity
- Digital PA driver output level +2 dBm
- 0.7 degrees RMS phase error
- Integrated digitally controlled crystal oscillator (DCXO)
■ Software support:
- GSM/GPRS layer 1,2,3 (GPRS is not available on LOCOSTO Lite.)
- Adaptive multirate (AMR), full rate (FR), half rate (HR), enhanced full rate (EFR)
- Teletypewriter (TTY)
- SAIC over GSM
- Man machine interface (MMI) for test
- Wireless application protocol (WAP), enhanced message service(EMS), multimedia message
service (MMS), JAVA
■ Multimedia support:
- Internal 300 KP camera support
- MP3 player
- Up to 32 polyphonies stereo midi player
- Up to 32 polyphonies mono midi ringer
- JPEG encode and decode
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Only for training and service purposes
3. HW Circuit Description
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LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. HW Circuit Description
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The LOCOSTO device communicates with the analog TWL3031 external subsystem, which provides
the following capabilities:
- Handset microphone and speaker
- Headset mono/stereo audio speakers and microphone connection
- Melody ringer (hands-free) and buzzer
- Battery pack (Nimh/Li-ion) and six 7-V regulated or 20-V nonregulated charger
- Vibrator motor control
- Real-time clock (RTC) 32-kHz crystal
The following external/extra subsystems are also supported:
- TI-Bluetooth (BRF6150) wireless short-distance connectivity
- Voice/audio and data
- TI-AGPS/TWL5002 localization system (I/F provision)
- Digital camera systems (not available on LOCOSTO Lite)
- VGA camera sensor/module, for example, AGILENT ADCM-2700 (not available on LOCOSTO
Lite)
- OMAP-DMxx(GoldenEye) camera companion chip (up to 3M-pixel) (not available on LOCOSTO
Lite)
- UART cable or IrDA (infrared data association)
- Boot-manufacturing capability from the USB link
- FM radio receiver (for example, Philips TEA5767/68)
- Primary (Qcif) and secondary LCD
- NAND flash-based media storage (for example, on-board SmartMedia)
- USB carkit

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3. HW Circuit Description
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3.1.3 Asynchronous Operation Mode Concept
The Locosto can operate in either:
• The traditional synchronous mode with the 26MHz system clock synchronized on the base station
• A special asynchronous mode (XO concept).
In the asynchronous mode the 26MHz clock input is not synchronized with the base station; the
residual frequency offset is compensated in the digital signal processing domain. This processing
includes frequency and timing compensation of the baseband and voiceband signals.
3.1.4 Receiver Antenna Bar Display
( -104 〜-105) ±2 (dBm)
Less -106 ±2 (dBm)
( -101 〜-103) ±2 (dBm)
skip
( -93 〜-100 ) ±2 (dBm)
Over -92 ±2 (dBm)
RSSI Range (dBm)Antenna Bar