LG KP260 User manual

Service Manual Model : KP260/265
Service Manual
KP260/265
Date: August, 2008 / Issue 1.0
Internal Use Only

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1. INTRODUCTION ...............................5
1.1 Purpose .................................................. 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE...............................9
2.1 H/W Features...........................................9
2.2 Technical Specification (KP265c,d) .......10
3. TECHNICAL BRIEF ........................15
3.1 Power Amplifier module
(SKY77318, U501).................................15
3.2 FEM(LMSP43QA-538, FL500)...............17
3.3 Transceiver (AD6548, U502) .................18
3.4 26 MHz Clock (Crystal, X500)................20
3.5 BT Module with integrated FM tuner
(BC5-FM, U500).....................................21
3.6 Baseband Processor (AD6726, U103)...22
3.7 Display and Interface .............................28
3.8 Camera Interface(AIT716 , U400)..........30
3.9 Keypad Switches and Scanning ............33
3.10 Microphone ..........................................34
3.11 Main Speaker.......................................35
3.12 Headset Interface.................................36
3.13 Key Back-light Illumination...................37
3.14 LCD Back-light Illumination..................38
3.15 VIBRATOR...........................................38
3.16 Battery Charging ..................................39
4. TROUBLE SHOOTING ...................40
4.1 RF Component.......................................40
4.2 RX Trouble.............................................41
4.3 TX Trouble .............................................46
4.4 Bluetooth + FM Radio ............................52
4.5 Power On Trouble..................................55
4.6 Charging Trouble ...................................57
4.7 Vibrator Trouble .....................................60
4.8 LCD Trouble...........................................62
4.9 Camera Trouble .....................................65
4.10 Speaker Trouble ..................................68
4.11 SIM Card Interface Trouble..................70
4.12 Earphone Trouble ................................72
4.13 KEY backlight Trouble .........................74
4.14 Receiver Trouble..................................76
4.15 Microphone Trouble .............................78
4.16 RTC Trouble ........................................80
4.17 Slide open/close Trouble .....................82
4.18 Micro SD Trouble .................................84
5. DOWNLOAD.......................................86
5.1 Download ...............................................86
6. BLOCK DIAGRAM ..........................92
7. CIRCUIT DIAGRAM ........................93
8. BGA IC Pin Check ........................101
9. PCB LAYOUT................................105
10. ENGINEERING MODE ................111
10.1 MF Mode [MENU 1] ...........................112
10.2 ELT Mode [MENU 2]..........................113
10.3 Version [MENU 3] ..............................113
10.4 Factory Reset [MENU 4] ....................113
10.5 Eng Mode [MENU 5] ..........................113
10.6 Network Info [MENU 6] ......................115
11. STAND ALONE TEST .................116
11.1 Introduction ........................................116
11.2 Setting Method...................................116
11.3 Means of Test ....................................117
12. AUTO CALIBRATION..................119
12.1 Overview ............................................119
12.2 Equipment List ...................................119
12.3 Test Jig Operation..............................120
12.4 Procedure ..........................................121
12.5 AGC ...................................................123
12.6 APC....................................................123
12.7 ADC ...................................................123
13. EXPLODED VIEW &
REPLACEMENT PART LIST ......125
13.1 Exploded View ...................................125
13.2 Replacement Parts ............................127
13.3 Accessory ..........................................148
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 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 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. PERFORMANCE
2.1 H/W Features
2. PERFORMANCE
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, 3.7V 900mAh
Talk time Up to 240min : GSM Tx Level 7
Stand by time Up to 350 hours (Paging Period: 5, RSSI: -85 dBm)
Charging time Approx. 3 hours
RX Sensitivity -102dBm
TX output power GSM850, GSM900 : 32.5dBm(Level 5),
DCS , PCS: 29.5dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V
Display MAIN : TFT 128 x 160 pixel 262K Color
Hard icons. Key Pad
Status Indicator 0 ~ 9, #, *, Up/Down/Left/Right/Ok Navigation Key
Menu Key, Clear Key, Confirm Key, Send Key , PWR Key,
Volume Key, Camera-Hot Key
ANT Internal
EAR Phone Jack Yes (Stereo)
PC Synchronization Yes
Speech coding EFR/FR/HR
Data Yes
Vibrator Yes
Loud Speaker Yes
Voice Recoding Yes
Microphone Yes
Speaker/Receiver Receiver 11X 07, Speaker : 12 X 18
Travel Adapter Yes
MIDI 40poly SW MIDI
Camera 1.3M

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2. PERFORMANCE
2.2 Technical Specification (KP265c,d)
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
GSM850
TX: 824 + 0.2 x (n-127) MHz
RX: 869 + 0.2 x (n-127) MHz ( n = 128 ~ 251)
GSM900 (EGSM)
TX: 890 + (n-1024) x 0.2 MHz
RX: 935 + (n-1024) x 0.2 MHz (n=975~1024)
GSM900 (PGSM)
1Frequency Band TX: 890 + (n-1024) x 0.2 MHz
RX: 935 + (n-1024) x 0.2 MHz (n=1~124)
DCS1800
TX: 1710 + (n-512) x 0.2 MHz
RX: 1805 + (n-512) x 0.2 MHz (n=512~885)
PCS1900
TX: 1810 + (n-512) x 0.2 MHz
RX: 1905 + (n-512) x 0.2 MHz (n=512~885)
2Phase Error RMS < 5 degrees
Peak < 20 degrees
3Frequency Error < 0.1 ppm
GSM850/EGSM900
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
DCS1800/PCS1900
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. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
5EDGE Max. Power Not support
6 EDGE Modulation Accuracy Not support
GSM850/EGSM900
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
7Output RF Spectrum 6,000 -71
(due to modulation) DCS1800/PCS1900
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
GSM850/EGSM900
Offset from Carrier (kHz) Max. (dBm)
Output RF Spectrum 400 -19
8(due to switching transient) 600 -21
1,200 -21
1,800 -24

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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 Description Specification
PCS
Offset from Carrier (kHz). Max. (dBm)
Output RF Spectrum 400 -22
8(due to switching transient) 600 -24
1,200 -24
1,800 -27
9Spurious Emissions Conduction, Emission Status
Radiation, Emission Status
GSM850/EGSM900
10 Bit Error Ratio BER (Class II) < 2.439% @-102dBm
DCS1800/PCS1900
BER (Class II) < 2.439% @-102dBm
11 RX Level Report Accuracy 2 3 dB
12 SLR 8 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 0 -12
13 Sending Response 1,000 0 -6
2,000 4 -6
3,000 4 -6
3,400 4 -9
4,000 0 -
14 RLR -4 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -6 7
200 2 7
15 Receiving Response (Type 3.2) 300 2 -9
1,000 2 -7
3,400 2 -12
4,000 2 -

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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 Description Specification
16 STMR > 17 dB
17 Echo Loss > 40 dB
18 Idle Noise Sending < -64 dBm0p
19 Idle Noise Receiving < -36 dBm0p
Max. power
< 300mA @GSM850, PL=5
< 230mA @PCS, PL=0
Standby
< 5.5mA @PP2
< 3.3mA @PP5
< 2.7mA @PP9
20 Power consumption Bluetooth
< 5.0mA @ Bluetooth on (Standby)
< 300mA @ Bluetooth connected (Call)
FM radio
< 40mA @ FM Radio Operation (AVG)
Backup Battery (Without Main Battery)
Normal Power Off : < 5uA
Emergency Power Off : < 15uA
4 hr., Min.@GSM850/ESGSM900, PL=5
21 Talk Time 6 hr., Min.@GSM850/EGSM900, PL=12
4.5 hr., Min.@DCS/PCS, PL=0
7 hr., Min.@DCS/PCS, PL=10
400 hr., Min.@PP9
350 hr., Min.@PP5
22 Standby Time - Full charge, no receive/send and keep GSM in idle mode.
Broadcast set off. Signal strength display set at 3
levelabove. Backlight of phone set off.
At least 55 dB under below conditions:
23 Ringer Volume(TBD) 1. Ringer set as ringer.
2. Test distance set as 1 m.

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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 Description Specification
24 Charge Current Fast Charge : < 450 mA
Slow Charge: < 80 mA
25 Charging Time Under 3 hr.
Antenna Bar Number Power
5-92 dBm ~
4-100 dBm ~ -93 dBm
26 Antenna Display 3 skip
2-103 dBm ~ -101 dBm
1-105 dBm ~ -104 dBm
0~-105 dBm
Battery Bar Number Voltage
1 →03.42V 0.05V
27 Battery Indicator 2 →13.55V 0.05 V
3 →23.7V 0.05 V
34.2V
28 Low Voltage Warning(TBD) 3.42 0.05 V (Call)
3.42 0.05 V (Standby)
29 Forced shut down Voltage 3.33 0.05V
30 Battery Type Main Battery : Li-ion, 900mAh, Inner Pack
Back-up Battery : Lithium, 1mAh
31 Travel Charger Input: 100 ~ 240 V, 50/60Hz
Output: 5.6V, 400mA

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3. TECHNICAL BRIEF
3.1 Power Amplifier module (SKY77318, U501)
The SKY77318 Power Amplifier Module (PAM) is designed in a low profile (1.2 mm), compact form
factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation.
The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.
The module consists of separate GSM PA and DCS1800/PCS1900 PA blocks, impedance-matching
circuitry for 50 Ω input and output impedances and a Power Amplifier Control (PAC) block with an
internal current-sense resistor. The custom BiCMOS integrated circuit provides the internal PAC
function and interface circuitry. Fabricated onto a single Gallium Arsenide (GaAs) die, one
Heterojunction Bipolar Transistor (HBT) PA block supports the GSM bands and the other supports the
DCS1800 and PCS1900 bands. Both PA blocks share common power supply pins to distribute
current.
3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.1 Functional Block Diagram

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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Table 3.1 Pad description
Figure 3.2 Pad configuration (Top view) and case marking

3.2 FEM(LMSP43QA-538, FL500)
Quadband Front end modlue for 850/900/1800/1900
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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
Table 3.2 Mode Control logic
ANT_SW1 ANT_SW2
GSM850_EGSM TX H H
DCS_PCS TX L H
GSM850 RX H L
EGSM900 RX H L
DCS1800 RX L L
PCS1900 RX L L

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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
3.3 Transceiver (AD6548, U502)
The AD6548 provides a highly integrated direct conversion radio solution that combines, on a single chip, all radio
and power management functions necessary to build the most com-pact GSM radio solution possible. The only
external components required for a complete radio design are the Rx SAWs, PA, Switchplexer and a few passives
enabling an extremely small cost effective GSM Radio solution. The AD6548 uses the industry proven direct
conversion receiver architecture of the OthelloTM family. For Quad band applications the front end features four
fully integrated programmable gain differential LNAs. The RF is then down converted by quad-rature mixers and
then fed to the baseband programmable-gain amplifiers and active filters for channel selection. The Receiver
output pins can be directly connected to the baseband analog processor. The Receive path features automatic
calibration and tracking to remove DC offsets. The transmitter features a translation-loop architecture for directly
modulating baseband signals onto the integrated TX VCO.
The translation-loop modulator and TX VCO are extremely low noise removing the need for external SAW filters
prior to the PA. The AD6548 uses a single integrated LO VCO for both the receive and the transmit circuits. The
synthesizer lock times are optimized for GPRS applications up to and including class 12.
AD6548 incorporates a complete reference crystal calibration system. This allows the external VCTCXO to be
replaced with a low cost crystal. No other external components are required. The AD6548 uses the traditional
VCTCXO reference source. The AD6548 also contains on-chip low dropout voltage regulators (LDOs) to deliver
regulated supply voltages to the functions on chip, with a battery input voltage of between 2.9V and 5.5V.
Comprehensive power down options are included to minimize power consumption in normal use. A standard 3
wire serial interface is used to program the IC. The interface features low-voltage digital interface buffers
compatible with logic levels from 1.6V to 2.9V.
Figure 3.3 AD6548 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
Notes:
1. Supply regulated by internal LDO3 and should not be connected to any other supply
2. Internally connected as Synth supply (Counters + SDM + Charge pump)
3. Supply regulated by internal LDO2 and should not be connected to any other supply
Table 1 AD6548/9 Pin Descriptions
No Name Description No Name Description
1VCC_FE Front end supply (IP) 17 VCC_REF Reference Oscillator Supply (IP)
2I I baseband input/output 18 VAFC/ AD6548 Crystal Freq control (IP)
N/C AD6549: Spare Pin
3IBIbaseband input/output 19 REFIN Crystal Connection
4VCC_BBI Baseband I, TX path supply (IP) 20 REFINB Crystal Connection
5SDATA Serial port data 21 REF_OP Reference Frequency Output
6SCLK Serial port clock 22 QB Q baseband input/output
7SEN Serial port enable 23 Q Q baseband input/output
8N/C Not connected 24 VCC_BBQ Baseband Q supply (IP)
9VLDO3 TX LDO Output (1) 25 RX1900B PCS 1900 LNA input
10 TXOP_LO Transmit O/P (850/900MHz) 26 RX1900 PCS 1900 LNA input
11 TXOP_HI Transmit O/P (1800/1900MHz) 27 RX1800B DCS 1800 LNA input
12 VCC_TXVCO TX VCO supply (1) 28 RX1800 DCS 1800 LNA input
13 VDD Serial interface supply 29 RX900B E-GSM LNA input
14 VBAT Battery I/P for LDO reg’s 30 RX900 E-GSM LNA input
15 VLDO1 LDO regulator Output (2) 31 RX850B GSM 850 LNA input
16 VLDO2 LO VCO Supply (3) 32 RX850 GSM 850 LNA input
GOMPLIANT TO JEDEC STANDARDS MO-220-VHHD-2

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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
3.4 26 MHz Clock (Crystal, X500)
The 26 MHz clock (X401) consists of a XO (Crystal Oscillator) which oscillates at a frequency of 26 MHz. The
AD6548 requires only an external low cost crystal as the frequency reference. The circuitry to oscillate the crystal
and tune its frequency is fully integrated. The Oscillator is a balanced implementation requiring the crystal to be
connected across 2 pins. There is a programmable capacitor array included for coarse tuning of fixed offsets (e.g.
crystal manufacturing tolerance), and an integrated varactor for dynamic control. The oscillator is designed for use
with a 26MHz crystal. Dedicated control software ensures excellent frequency stability under all circumstances.
Figure 3.4 CRYSTAL CIRCUIT DIAGRAM
12
34
DSX321G-26M
X500
26MHz

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3. TECHNICAL BRIEF
3.5 BT Module with integrated FM tuner(BC5-FM, U500)
The BlueCore5-FM BGA is a single-chip radio and baseband IC for Bluetooth 2.4GHz systems including
enhanced data rates (EDR) to 3Mbits/s. It includes an integrated FM receiver with stereo audio output stage and
an RDS demodulator.
With the on-chip CSR Bluetooth software stack, it provides a fully compliant Bluetooth system to v2.1 + EDR of
the specification for data and voice communications.
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes