LG KF690 User manual
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1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
2. PERFORMANCE...............................7
2.1 Supporting Standard ................................7
2.2 Main Parts : Solution................................7
2.3 HW Features............................................8
2.4 HW Spec................................................10
3. TECHNICAL BRIEF ........................12
3.1 General Description ...............................12
3.2 GSM Mode.............................................14
3.3 LO generation and distribution circuits...17
3.4 Off-chip RF Components .......................18
3.5 Digital Baseband (DBB/ESM6270) ........25
3.6 Subsystem(ESM6270) ...........................27
3.7 Power Block ...........................................34
3.8 External memory interface .....................39
3.9 H/W Sub System....................................41
3.10 Feature List ..........................................54
3.11 Touch Screen Interface........................59
4. TROUBLE SHOOTING ...................60
4.1 Power on trouble....................................60
4.2 USB trouble............................................62
4.3 SIM detect trouble..................................63
4.4 Key sense trouble (KEYPAD) ................64
4.5 Keypad backlight trouble........................67
4.6 Micro SD trouble ....................................68
4.7 Audio trouble..........................................69
4.8 Camera trouble ......................................84
4.9 Main LCD trouble ...................................87
4.10 Bluetooth trouble..................................90
4.11 Touch Screen trouble...........................92
4.12 RF Component.....................................94
4.13 SIGNAL PATH .....................................95
4.14 Checking VCTCXO Block ....................96
4.15 Checking Front-End Module Block ......98
4.16 Checking GSM Block .........................101
5. DOWNLOAD .................................107
5.1 Introduction ..........................................107
5.2 Downloading Procedure.......................107
5.3 Troubleshooting Download Errors .......120
5.4 Caution.................................................122
6. BLOCK DIAGRAM ........................123
6.1 GSM & UMTS RF Block.......................123
6.2 Interface Diagram ................................124
7. Circuit Diagram ............................127
8. BGM Pin Map................................135
9. PCB LAYOUT................................141
10. CALIBRATION & RF AUTO TEST
(HOT KIMCHI) .............................147
10.1 Usage of Hot-Kimchi ..........................147
11. EXPLODED VIEW &
REPLACEMENT PART LIST ......151
11.1 EXPLODED VIEW .............................151
11.2 Replacement Parts
<Mechanic component>.....................153
<Main component> ............................158
11.3 Accessory ..........................................175
Table Of Contents
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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 phones 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 phones 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
1. INTRODUCTION
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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
A 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.
1. INTRODUCTION
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2. PERFORMANCE
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2.1 Supporting Standard
2.2 Main Parts: GSM Solution
2. PERFORMANCE
Item Feature Comment
Supporting Standard 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
Application Standard WAP 2.0, JAVA 2.0
Item Part Name Comment
Digital Baseband ESM6270(Qualcomm)
Analog Baseband ESM6270(Qualcomm)
RF Chip RTR6235(Qualcomm)
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2.3 HW Features
2. PERFORMANCE
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Item Feature Comment
Form Factor Slide
Battery 1) Capacity
Standard : Li-Ion, 900mAh
2) Packaging Type : Soft Pack
Size 102 x 51 x 14.5 mm
Weight 107 g With Battery
Stand-by GSM 230 hours @paging period 5
Talk time GSM @ Power Level 7
Charging time 3 hrs @power OFF/900mAh
Rx sensitivity EGSM900 : -105 dBm
DCS1800 : -105 dBm
PCS1900 : -105 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 TFT Main LCD(3”, 240 x 480)
Built-in Camera 3.0 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
by
me
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2. PERFORMANCE
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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 Yes
T-Flash Yes
(External Memory)
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2.4 HW Spec.
2.4.1 GSM Transmitter/Receiver spec.
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2. PERFORMANCE
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Item Description 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)
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2. PERFORMANCE
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Item Description Specification
9 Spectrum due to switching 400kHz : -19dBm/-22dBm(5/0), -23dBm
transient 600kHz : -21dBm/-24dBm(5/0), -26dBm
10 Reference Sensitivity - TCH/FS Class II(RBER) : -105dBm(2.439%)
11 Usable receiver input level range 0.012(-15 - -40dBm)
12 Intermodulation rejection - 800kHz, 1600kHz : -98dBm / -96dBm (2.439%)
Speech channels
13 AM Suppression -98dBm/-96dBm (2.439%)
- GSM : -31dBm - DCS : -29dBm
14 Timing Advance 0.5T
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3.1 General Description
The KF690 supports EGSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/EDGE. All receivers
use the radioOne1Zero-IF architecture to eliminate intermediate frequencies, directly converting signals
between RF and baseband. The quad-band GSM transmitters use a baseband-to-IF upconversion
followed by an offset phase-locked loop that translates the GMSK-modulated or 8 PSKmodulated
signal to RF.
A generic, high-level functional block diagram of KF690 is shown in [Fig. 3.1]. One antenna collects
base station forward link signals and radiates handset reverse link signals. The antenna connects with
receive and transmit paths through a FEM(Front End Module).
The RFIC’s Rx analog baseband outputs, for the receive chains, connect to the ESM6270 IC. GSM Rx
baseband outputs share the same inputs to the ESM6270 IC.
For the transmit chains, the RTR6235 IC directly translates the Tx baseband signals (from the
ESM6270 device) to an RF signal using an internal LO generated by integrated on-chip PLL and VCO.
[Fig. 3.1] Block diagram of RF part
3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
1QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
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3. TECHNICAL BRIEF
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In the GSM receive path, the received RF signals are applied through their band-pass filters and
down-converted directly to baseband in the RTR6235 transceiver IC. These baseband outputs are
routed to the ESM6270 IC for further signal processing.
The GSM/EDGE transmit path employs one stage of up-conversion and, in order to improve efficiency,
is divided into phase and amplitude components to produce an open-loop Polar topology:
1. The on-chip quadrature upconverter translates the GMSK-modulated signal or 8-PSK modulated
signal, to a constant envelope phase signal at RF;
2. The amplitude-modulated (AM) component is applied to the ramping control pin of Polar power
amplifier from a DAC within the ESM6270
KF690 power supply voltages are managed and regulated by the PM6635 Power Management IC.
This versatile device integrates all wireless handset power management, general housekeeping, and
user interface support functions into a single mixed signal IC. It monitors and controls the external
power source and coordinates battery recharging while maintaining the handset supply voltages using
low dropout, programmable regulators.
The device’s general housekeeping functions include an ADC and analog multiplexer circuit for
monitoring on-chip voltage sources, charging status, and current flow, as well as user-defined off-chip
variables such as temperature, RF output power, and battery ID. Various oscillator, clock, and counter
circuits support IC and higher-level handset functions. Key parameters such as under-voltage lockout
and crystal oscillator signal presence are monitored to protect against detrimental conditions.
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3.2 GSM Mode
3.2.1 GSM Receiver
The Dual-mode KF690’s receiver functions are operated by only one RFIC as follows:
■ EGSM-900, DCS-1800 and PCS-1900 modes use the RTR6235 IC only. Each mode has
independent front-end circuits and down-converters, but they share common baseband circuits (with
only one mode active at a time). All receiver control functions are beginning with SBI2-controlled
parameters.
RF Front end consists of antenna, antenna switch module (D5013) which includes three RX saw filters
(EGSM-900, DCS-1800 and PCS-1900). The antenna switch module allows multiple operating bands
and modes to share the same antenna. In KF690, a common antenna connects to one of six paths: 1)
EGSM-900 Rx, 2) EGSM-900 Tx, 3) DCS-1800 Rx, and 4) DCS-1800, PCS-1900 Tx(High Band Tx’s
share the same path), 5) PCS-1900 Rx. GSM900, DCS1800, and PCS1900 operation is time division
duplexed, so either the receiver or transmitter is active at any time and a frequency duplexer is not
required.
The GSM900, DCS1800, and PCS1900 receiver inputs of RTR6235 are connected directly to the
transceiver front-end circuits(filters and antenna switch module). GSM900, DCS1800, and PCS1900
receiver inputs use differential configurations to improve common-mode rejection and second-order
non-linearity performance. The balance between the complementary signals is critical and must be
maintained from the RF filter outputs all the way into the IC pins.
Since GSM900, DCS1800, and PCS1900 signals are time-division duplex (the handset can only
receive or transmit at one time), switches are used to separate Rx and Tx signals in place of frequency
duplexers - this is accomplished in the switch module.
2The RFIC operating modes and circuit parameters are MSM-controlled through the proprietary 3 - line Serial Bus Interface (SBI). The Application
Programming Interface (API) is used to implement SBI commands. The API is documented in AMSS Software - please see applicable AMSS
Software documentation for details.
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3. TECHNICAL BRIEF
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ANT_SEL0 ANT_SEL1 ANT_SEL2
GSM 850/GSM 900 TX H L H
GSM 1800/GSM 1900 TX H H L
WCDMA H L L
GSM 850 RX L L L
GSM 900 RX L L H
GSM 1800 RX L H H
GSM 1900 RX L H L
[Table 3.1] Antenna Switch Module Control logic
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3. TECHNICAL BRIEF
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The GSM900, DCS1800, and PCS1900 receive signals are routed to the RTR6235 through band
selection filters and matching networks that transform single-ended 50Ω sources to differential
impedances optimized for gain and noise figure. The RTR input uses a differential configuration to
improve second-order inter-modulation and common mode rejection performance. The RTR6235 input
stages include ESM6270-controlled gain adjustments that maximize receiver dynamic range.
The amplifier outputs drive the RF ports of the quadrature RF-to-baseband downconverters. The
downconverted baseband outputs are multiplexed and routed to lowpass filters (one I and one Q)
having passband and stopband characteristics suitable for GMSK or 8-PSK processing. These filte
circuits include DC offset corrections. The filter outputs are buffered and passed on to the ESM6270
IC for further processing.r
[Fig. 3.2] RTR6235 RX feature
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3. TECHNICAL BRIEF
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3.2.2 GSM Transmitter
The RTR6235 transmitter outputs(HB_RF_OUT2 and LB_RF_OUT1) include on-chip output matching
inductors. 50ohm output impedance is achieved by adding a series capacitor at the output pins. The
capacitor value may be optimized for specific applications and PCB characteristics based on passband
symmetry about the band center frequency. The suggested circuit is shown in [Fig. 3.3]
The RTR6235 IC is able to support EGSM900 and DCS1800/PCS1900 mode transmitting. This design
guideline shows a tri-band GSM application.
Both high-band and low band outputs are followed by resistive pads to ensure that the load Presented
to the outputs remains close to 50ohm. The low-band GSM. Tx path also includes a Tx-band SAW filter
to remove noise-spurious components and noise that would be amplified by the PA and appear in the
GSM Rx band.
[Fig. 3.3] GSM Transmitter matching
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3. TECHNICAL BRIEF
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3.3 LO generation and distribution circuits
The integrated LO generation and distribution circuits are driven by internal VCOs to support various
modes to yield highly flexible quadrature LO outputs that drive all GSM/EDGE; with the help of these
LO generation and distribution circuits, true zero-IF architecture is employed in all GSM receivers and
transmitters to translate the signal directly from RF to baseband and from baseband to RF.
Two fully functional fractional-N synthesizers, including VCOs and loop filters, are integrated within the
RTR6235 IC. The first synthesizer (PLL1) creates the transceiver LOs that support all four GSM band
receivers and transmitters including: GSM900, DCS1800, and PCS1900. An external TCXO input
signal is required to provide the synthesizer frequency reference to which the PLL is phase and
frequency locked. The RTR6235 IC integrates most of PLL loop filter components on-chip except two
off-chip loop filter series capacitors, and significantly reduces off-chip component requirement. With
the integrated fractional-N PLL synthesizers, the RTR6235 has the advantages of more flexible loop
bandwidth control, fast lock time, and low-integrated phase error
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3.4 Off-chip RF Components
3.4.1 VCTCXO (X100 :DSA321SCE-19.2M)
The Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO) provides the reference
frequency for all RFIC synthesizers as well as clock generation functions within the ESM6270 IC. The
oscillator frequency is controlled by the ESM6270 ICs. TRK_LO_ADJ pulse density modulated signal in
the same manner as the transmit gain control TX_AGC_ADJ. A two-pole RC lowpass filter is
recommended on this control line.
The PM6635 IC controls the handset power-up sequence, including a special VCTCXO warm-up
interval before other circuits are turned on. This warm-up interval (as well as other TCXO controller
functions) is enabled by the ESM6270 TCXO_EN line . The PM6635 IC VREG_TCXO regulated output
voltage is used to power the VCTCXO and is enabled before most other regulated outputs.
Any GSM mode power control circuits within the ESM6270 IC require a reference voltage for proper
operation and sufficient accuracy. Connecting the PM6635 IC REF_OUT directly to the ESM6270 IC
GSM_PA_PWR_CTL_REF provides this reference. This sensitive analog signal needs a 0.1 µF low
frequency filter near to MSM side, and isolate from digital logic and clock traces with ground on both
sides, plus ground above and below if routed on internal layers.
3.4.2 Front-End Module (FL100 : D5013)
This equipment uses a single antenna to support all handset operating modes, with an antenna switch
module select the operating frequency and band. The active connection is ESM6270-selected by three
control lines (GPIO[9], GPIO[10], and GPIO[11]). These GPIOs are programmed to be ANT_SEL0,
ANT_SEL1, and ANT_SEL2 respectively.
3. TECHNICAL BRIEF
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ANT_SEL0 ANT_SEL1 ANT_SEL2
GSM 850/GSM 900 TX H L H
GSM 1800/GSM 1900 TX H H L
GSM 850 RX L L L
GSM 900 RX L L H
GSM 1800 RX L H H
GSM 1900 RX L H L
[Table 3.2] Front End Module control logic
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3.4.3 PMIC Functional Block Diagram (U402 : PM6635)
■ Input power management
- Valid external supply attachment and removal detection
- Supports unregulated (closed-loop) external charger supplies and USB supplies as input power
sources
- Supports lithium-ion main batteries
- Trickle, constant current, constant voltage, and pulsed charging of the main battery
- Supports coin cell backup battery (including charging)
- Battery voltage detectors with programmable thresholds
- VDD collapse protection
- Charger current regulation and real-time monitoring for over-current protection
- Charger transistor protection by power limit control
- Control drivers for two external pass transistors and one external battery MOSFET - MOSFET is
optional
- Voltage, current, and power control loops
- Automated recovery from sudden momentary power loss
■ Output voltage regulation
- One boost (step-up) switched-mode power supply (SMPS) for driving white LEDs and hosting
USBOTG
- Three buck (step-down) switched-mode power supplies that efficiently generate ESMC, ESME,
and PA (or second ESMC) supply voltages
- Supports dynamic voltage scaling (DVS) for ESMC and PA
- Eleven low dropout regulator circuits with programmable output voltages, implemented using three
different current ratings: 300 mA (two), 150 mA (six), and 50 mA (three). These can be used to
power ESMA, ESMP, RFRX1, RFRX2, RFTX, SYNT, TCXO, WLAN, MMC, USB, and RUIM
circuits.
- All regulators can be individually enabled/disabled for power savings
- Low power mode available on ESMA and ESMP regulators
- All regulated outputs are derived from a common bandgap reference - close tracking
3. TECHNICAL BRIEF
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■ Integrated handset-level housekeeping functions reduces external parts count, size, cost
- Analog multiplexer selects from 8 internal and up to 18 external inputs
- Multiplexer output’s offset and gain are adjusted, increasing the effective ADC resolution
- Adjusted multiplexer output is buffered and routed to an ESM device ADC
- Dual oscillators - 32.768 kHz off-chip crystal and on-chip RC assures ESM device sleep clock
- Crystal oscillator detector and automated switch-over upon lost oscillation
- Real time clock for tracking time and generating associated alarms
- On-chip adjustments minimize crystal oscillator frequency errors
- Circuits control TCXO warm-up and synchronize, deglitch, and buffer the TCXO signal
- TCXO buffer control for optimal QPH/catnap timing
- Three-stage over-temperature protection (smart thermal control)
■ Integrated handset-level user interfaces
- Four programmable current sinks recommended as keypad backlight, LCD backlight, camera
flash, and general-purpose drivers
- Vibration motor driver programmable from 1.2 to 3.1V in 100 mV increments
- Speaker driver with programmable gain, turn-on time, and muting; differential operation (drives
external 8 Ω speakers with volume controlled 500 mW)
■ IC-level interfaces
- ESM6270 device-compatible 3-line SBI for efficient initialization, status, and control
- Supports the ESM6270 device’s interrupt processing with an internal interrupt manager
- Many functions monitored and reported through real-time and interrupt status signals
- Dedicated circuits for controlled power-on sequencing, including the ESM6270 device’s reset
signal
- Several events continuously monitored for triggering power-on/power-off sequences
- Supports and orchestrates soft resets
- USB-OTG transceiver for full-speed (12 Mb/s) and low speed (1.5 Mb/s) interfacing of the
ESM6270
- device to computers as a USB peripheral, or connecting the ESM6270 device to other peripherals
- RUIM level translators enable ESM6270 device interfacing with external modules
■ Twelve multi-purpose pins that can be configured as digital or analog I/Os, bi-directional I/Os, or
current sinks. Default functions support the RUIM level translators, power-on circuits, analog
multiplexer inputs, an LED driver, and a reference voltage buffer.
■ Highly integrated functionality in a small package - 84-pin BCCS with a large center slug for
electrical ground, mechanical stability, and thermal relief
3. TECHNICAL BRIEF
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