LG KF240 User manual

Date: May, 2008 / Issue 1.0
Service Manual Model :KF240
Service Manual
KF240
Internal Use Only

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1. INTRODUCTION .............................. 5
1.1 Purpose .................................................. 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. SYSTEM SPECIFICATION............... 9
2.1 H/W Features.......................................... 9
2.2 Technical Specification ......................... 10
3. TECHNICAL BRIEF ....................... 15
3.1 Digital Main Processor(AD6900, U101) 15
3.2 Analog Main Processor(AD6855, U100)18
3.3 Power Amplifier Module
(SKY77318, U600)................................ 25
3.4 FEM (DGM1110M014, FL600) ............. 26
3.5 RTC(FC-135, X100).............................. 27
3.6 Crystal(26 MHz, X600).......................... 28
3.7 RF Tranceiver(AD6548, U601) ..............30
3.8 MEMORY(PF38F5060M0Y0BE, U201).36
3.9 BT Module with integrated FM tuner
(EWFMLBAXX, U200) ...........................39
3.10 SIM Card Interface...............................41
3.11 Micro-SD Card Interface ......................42
3.12 LCD Interface.......................................43
3.13 Battery Charger Interface.....................46
3.14 Keypad Interface..................................47
3.15 Audio Interface.....................................49
3.16 Camera Interface(2M Fixed Focus
Camera) ...............................................56
3.17 KEY BACLKLIGHT LED Interface .......59
3.18 Vibrator Interface .................................60
4. TROUBLE SHOOTING ...................61
4.1 RF Component.......................................61
4.2 RX Trouble.............................................62
4.3 TX Trouble .............................................67
4.4 Power On Trouble..................................73
4.5 Charging Trouble ...................................75
4.6 Vibrator Trouble .....................................77
4.7 LCD Trouble...........................................79
4.8 Camera Trouble .....................................83
4.9 Speaker/Receiver Trouble .....................87
4.10 Earphone Trouble ................................90
4.11 Microphone Trouble .............................92
4.12 SIM Card Interface Trouble..................94
4.13 Main key backlight Trouble ..................96
4.14 Slide key backlight Trouble ..................98
4.15 RTC Trouble ......................................101
4.16 Folder on/off Trouble..........................103
4.17 6 Micro SD Trouble ............................105
4.18 Bluetooth Trouble...............................107
4.19 FM Radio Trouble ..............................109
5. DOWNLOAD .....................................111
5.1 Download .............................................111
6. BLOCK DIAGRAM ........................117
7. CIRCUIT DIAGRAM ......................119
8. BGA IC Pin Check ........................129
9. PCB LAYOUT................................133
10. ENGINEERING MODE ................139
10.1 BB Test [MENU 1]..............................140
10.2 RF Test [MENU 2]..............................142
10.3 MF mode [MENU 3] ...........................142
10.4 Trace option [MENU 4] ......................143
10.5 Call timer [MENU 5] ...........................143
10.6 Fact. Reset [MENU 6] ........................143
10.7 S/W version........................................143
11. STAND ALONE TEST .................144
11.1 Introduction ........................................144
11.2 Setting Method...................................144
11.3 Means of Test ....................................145
12. AUTO CALIBRATION .................147
12.1 Overview ............................................147
12.2 Equipment List ...................................147
12.3 Test Jig Operation..............................148
12.4 Procedure ..........................................149
12.5 AGC ...................................................151
12.6 APC....................................................151
12.7 ADC ...................................................151
13. EXPLODED VIEW &
REPLACEMENT PART LIST ......153
13.1 Exploded View ...................................153
13.2 Replacement Parts ............................155
13.3 Accessory ..........................................171
Table Of Contents
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

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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 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
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:
• 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 matb 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 milli watt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
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

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1. INTRODUCTION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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
SAW Surface Acoustic Wave
SIM Subscriber Identity Module
SLR Sending Loudness Rating
SRAM Static Random Access Memory
PSRAM Pseudo SRAM
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

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2. SYSTEM SPECIFICATION
2.1 H/W Features
2. SYSTEM SPECIFICATION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
Standard Battery Li-ion Polymer, 3.7V 800mAh
Stand by TIME Up to 200 hrs : Paging Period 5, RSSI 85dBm
Talk time Up to 200min : GSM Tx Level 7
Charging time Approx. 3 hours
RX Sensitivity GSM, EGSM: -109dBm, DCS: -109dBm
TX output power GSM, EGSM: 32.5dBm(Level 5),
DCS , PCS: 29.5dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V Small
Display MAIN : TFT 176 ×220 pixel 262K Color
Hard icons. Key Pad
Status Indicator 0 ~ 9, #, *, Up/Down, Left/Right Navigation Key, OK Key
Soft Key (Left/Right), Send, Clear, PWR Key
Volume Key(Up/Down), Camera Key, MP3 Key
ANT Internal
EAR Phone Jack Yes
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax Yes
Vibrator Yes
Voice Recoding Yes
Microphone Yes
Speaker/Receiver 18x10 one way dual speaker
Travel Adapter Yes
MIDI SW MIDI
Camera 2M
Bluetooth / FM Radio Bluetooth version 2.0 / 76~108MHz supported

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2. SYSTEM SPECIFICATION
2.2 Technical Specification
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
GSM850
TX: 824 + n x 0.2 MHz
RX: 869 + n x 0.2 MHz (n=1~128)
PCS
1Frequency Band TX: 1850.2 + (n-512) x 0.2 MHz
RX: 1930.2+ (n-1512) x 0.2 MHz (n=512~810)
DCS
TX: 1710.2 + (n-512) x 0.2 MHz
RX: 1805.2 + (n-512) x 0.2 MHz (n=512~885)
2Phase Error RMS < 5 degrees
Peak < 20 degrees
3Frequency Error < 0.1 ppm
GSM
Level Power Toler. Level Power Toler.
533 dBm 2dB 13 17 dBm 3dB
631 dBm 3dB 14 15 dBm 3dB
729 dBm 3dB 15 13 dBm 3dB
827 dBm 3dB 16 11 dBm 5dB
925 dBm 3dB 17 9 dBm 5dB
10 23 dBm 3dB 18 7 dBm 5dB
11 21 dBm 3dB 19 5 dBm 5dB
4Power Level 12 19 dBm 3dB
DCS/PCS
Level Power Toler. Level Power Toler.
030 dBm 2dB 8 14 dBm 3dB
128 dBm 3dB 9 12 dBm 4dB
226 dBm 3dB 10 10 dBm 4dB
324 dBm 3dB 11 8 dBm 4dB
422 dBm 3dB 12 6 dBm 4dB
520 dBm 3dB 13 4 dBm 4dB
618 dBm 3dB 14 2 dBm 5dB
716 dBm 3dB 15 0 dBm 5dB

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2. SYSTEM SPECIFICATION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
GSM, EGSM
Offset from Carrier (kHz). Max. [dBc]
100 0.5
200 -30
250 -33
400 -60
600 ~ 1,200 -60
1,200 ~ 1,800 -60
1,800 ~ 3,000 -63
3,000 ~ 6,000 -65
5Output RF Spectrum 6,000 -71
(due to modulation) DCS/PCS
Offset from Carrier (kHz). Max. [dBc]
100 0.5
200 -30
250 -33
400 -60
600 ~ 1,200 -60
1,200 ~ 1,800 -60
1,800 ~ 3,000 -65
3,000 ~ 6,000 -65
6,000 -73
GSM, EGSM
Offset from Carrier (kHz) Max. [dBm]
Output RF Spectrum 400 -19
6(due to switching transient) 600 -21
1,200 -21
1,800 -24

Item Description Specification
DCS/PCS
Offset from Carrier (kHz) Max. [dBm]
Output RF Spectrum 400 -22
6(due to switching transient) 600 -24
1,200 -24
1,800 -27
7Spurious Emissions Conduction, Emission Status
GSM, EGSM
8Bit Error Ratio BER (Class II) < 2.439% @-102 dBm
DCS, PCS
BER (Class II) < 2.439% @-100 dBm
9RX Level Report Accuracy
10 SLR 8 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 0 -12
11 Sending Response 1,000 0 -6
2,000 4 -6
3,000 4 -6
3,400 4 -9
4,000 0 -
12 RLR 2 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 2 -12
500 * -5
13 Receiving Response 1,000 0 -5
3,000 2 -5
3,400 2 -10
4,000 2
*Mean that Adopt a straight line in between 300 Hz
and 1,000 Hz to be Max. level in the range.
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2. SYSTEM SPECIFICATION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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2. SYSTEM SPECIFICATION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
14 STMR 13 5 dB
15 Stability Margin > 6 dB
dB to ARL (dB) Level Ratio (dB)
-35 17.5
-30 22.5
16 Distortion -20 30.7
-10 33.3
033.7
731.7
10 25.5
17 Side Tone Distortion Three stage distortion < 10%
18 System frequency ≤2.5ppm
(13 MHz) tolerance
19 32.768KHz tolerance ≤ 30 ppm
At least 65 dBspl under below conditions:
20 Ringer Volume 1. Ringer set as ringer.
2. Test distance set as 50 cm
Fast Charge : Typ. 430 mA
21 Charge Current Slow Charge : Typ. 80mA
Total Charging Time : < 3 hours
Bar Number Power
7-93~
7 →5-93 2
22 Antenna Display 5 →4-98 2
4 →2-101 2
2 →1-104 2
1 →0-106 2
0 →OFF ~-106
Battery Bar Number Voltage
3≤3.75 0.05 V
23 Battery Indicator 3 →23.75 0.05 V
2 →13.64 0.05 V
1 → 03.54 0.05 V

Item Description Specification
24 Low Voltage Warning ≤ 3.54 0.05V (Call)
(Blinking Bar) ≤ 3.4 0.05V (Standby)
25 Forced shut down 3.33 0.05V
Voltage
26 Sustain RTCwithout battery Over 50 hours
Li-Ion Battery
27 Battery Type Standard Voltage = 3.7 V
Battery full charge voltage = 4.2 V
Capacity: 800mAh
Switching-mode charger
28 Travel Charger Input: 100 ~ 350V, 50/60 Hz
Output: 5.1 V, 700 mA
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2. SYSTEM SPECIFICATION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.1 Digital Main Processor(AD6900, U101)
The AD6900 is an advanced, low-power baseband processing solution from Analog Devices, and is
part of the AD20msp500 SoftFone® chipset family. The AD6900 is intended for use in a wide variety of
feature-rich phones with GSM/GPRS/EGPRS based system connectivity requirements. It is designed
to interface easily to an application/OS processor, or to stand alone as a fully integrated and easy-to-
use solution for mobile handset and wireless modem applications.
Figure. 3-1 AD6900 FUNCTIONAL BLOCK DIAGRAM

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.1.1 Features of AD6900
Complete Single-Chip Programmable Digital Baseband Processor with four main subsystems
MCU Control Processor Subsystem:
32-bit ARM926EJ-S® MCU Control Processor
260 MHz operation at 1.5V
dedicated caches, 16K bytes each, for instructions and data
4kB Instruction Tightly Coupled Memory (TCM)
2-Mbit On-chip System SRAM
Ciphering coprocessor for GPRS supporting GEA1 and GEA2 encryption algorithms
Kasumi cipher coprocessor for GEA3 encryption
Dedicated multichannel DMA controller
DSP Subsystem:
Blackfin 16-bit fixed-point DSP Processor
260 MHz operation at 1.5V
Memory:
→L1 program space: 64 kB SRAM and 16 kB configurable as instruction cache or SRAM
→L1 data space: Two banks of 16K bytes, each with 8K bytes of dedicated SRAM and an
additional 8K bytes that can be configured as either cache or SRAM
→L2 space: 64KB SRAM
Ciphering coprocessor (GEA1 and GEA2)
Kasumi cipher coprocessor for GEA3 encryption
Dedicated multichannel DMA controller
Peripherals Subsystem:
Shared on-chip peripherals and off-chip interfaces:
Support for Burst-mode, Page-mode, and NAND Flash memory
Support for SRAM, SDRAM, and PSRAM (cellular RAM)
Full-Speed USB 2.0 Dual-Role Interface with OTG (On-The-Go) Host Mode or traditional Peripheral-
only mode

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Applications Subsystem for Enhanced Multimedia:
Parallel Peripheral Interface (PPI) for 10-bit dedicated camera
sensor or video input interface (including ITU-656 and ITU-601 digital video)
Separate external bus interface for parallel LCD displays (or camera module inputs)
- reduces noise and loading on the
main EBUS interface
Dedicated multi-channel DMA controller
OTHER FEATURES
Real-Time Clock (RTC) with Alarm
Four General-Purpose Timers
Baseband Converter Interface
Compatible with Othello® radio subsystem
Highly configurable interrupt controller architecture
Programmable bus arbitration to optimize system performance
Supports 13 MHz and 26 MHz Input Clocks
Programmable Power Management and Clock Management
- Slow Clocking Scheme for Low Idle Mode Current
- Power Down modes
- Dynamic Core Voltage Scaling from 1.1 - 1.5V
Independent I/O Voltage Domains
On-chip support for EGPRS Data Services up to Class 10
Embedded Trace Macrocell for MCU Debug
JTAG Interface for Test and In-Circuit Emulation of both the MCU and DSP Advanced features for
security

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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3.2 Analog Main Processor(AD6855, U100)
The AD6855 is a complete mixed-signal baseband processor that combines all of the data converters
and power supply regulators required for a GSM 900 / GSM 850 / DCS 1800 / PCS 1900 mobile on a
single device, including HSCSD, GPRS and EGPRS.
Figure. 3-2-1 AD6855 FUNCTIONAL BLOCK DIAGRAM

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.2.1 General Description
The AD6855 baseband transmit section supports the following mobile station GMSK modulation power
classes:
GSM 900/850 power classes 4 and
DCS 1800 power classes 1 and 2, and
PCS 1900 power classes 1 and 2.
The AD6855 baseband transmit section supports the following mobile station 8-PSK modulation power
classes:
GSM 900/850 power classes E2 and E3,
DCS 1800 power classes E2 and E3, and
PCS 1900 power classes E2 and E3.
The AD6855 baseband receive section supports GMSK and 8-PSK applications.
The AD6855 auxiliary section provides a voltage reference, an automatic frequency control DAC, an
auxiliary ADC, and light controllers. The auxiliary ADC provides two channels for measuring
temperature using discrete external devices placed in critical locations. The AD6855 audio section
provides 8 kHz and 16 kHz sampling rates for voiceband data input and output and provides nine
standard sample rates ranging from 8kHz to 48 kHz for personal audio output on two PCM Audio serial
ports. The two Audio serial ports allow support for concurrency. The AD6855 power management
section provides voltage regulators for digital and analog components, a battery charger, battery
protection circuitry, and power supply activation logic. The AD6855 digital processor interface provides
serial ports for control data, baseband transmit and receive data, and two for audio data.

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.2.2 Power Block
CSPORT interface, power management control interface and the circuit that generates power up
RESET pulses (RESET2P8 and RESET1P8) for use by the DBB chip.
All regulators except the USB interface regulator are powered from the main battery.
The USB regulator is powered from USB VBUS.
And the user presses KEYON which puts the AD6855 power management system into ACTIVATION
state (see definitions below) and signals DBB software that it’s time to wake up and operate using the
KEYOUT signal.
Figure. 3-2-2 AD6855 POWER BLOCK DIAGRAM

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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure. 3-2-3 AD6855 KEYON/KEYOUT BLOCK DIAGRAM
Figure. 3-2-4 AD6855 RESET GENERATION BLOCK DIAGRAM