Lg Lg-s310 User manual

Service Manual Model : LG-S310

Internal Use Only

Service Manual

LG-S310

Date: December, 2010 / Issue 1.1

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Only for training and service purposes

LGE Internal Use Only

Table Of Contents

1. INTRODUCTION..................................................................5

1.1 Purpose............................................................................................... 5

1.2 Regulatory Information ............................................................... 5

1.3 Abbreviations................................................................................... 7

2. PERFORMANCE...................................................................9

2.1 HW Feature........................................................................................ 9

2.2 RF Spec..............................................................................................10

3. TECHNICAL BRIEF.............................................................11

3.1 General Description.....................................................................11

3.2 GSM Part...........................................................................................12

3.3 Functional Block Diagram.........................................................19

3.4 Baseband Processor Introductions .......................................20

3.5 Charging Control ..........................................................................31

3.6 Power ON/OFF...............................................................................33

3.7 SIM Interface...................................................................................34

3.8 MICRO SD Card Socket (ENSY0018601) ..............................35

3.9 Memory............................................................................................37

3.10 LCD Display...................................................................................40

3.11 LCD Backlight Illumination ....................................................42

3.12 Keypad Switching & Scanning..............................................45

3.13 Keypad Backlight Illumination .............................................46

3.14 u USB Multimedia interface connector.............................47

3.15 Camera...........................................................................................48

3.16 Audio...............................................................................................49

3.17 Bluetooth/FM (WYSBNBGX6)................................................55

4. TROUBLE SHOOTING .......................................................59

4.1 Trouble shooting test setup.....................................................59

4.2 Power on trouble..........................................................................60

4.3 Charging Trouble..........................................................................63

4.4 USB Trouble.....................................................................................65

4.5 SIM Detect Trouble.......................................................................68

4.6 Key Sense Trouble ........................................................................70

4.7 Keypad Backlight Trouble .........................................................73

4.8 Micro SD Trouble ..........................................................................75

4.9 Audio Trouble.................................................................................78

4.10 Camera Trouble...........................................................................93

4.11 Main LCD Trouble.......................................................................96

4.12 Vibrator Trouble..........................................................................99

4.13 BT Trouble .................................................................................. 101

4.14 FM Trouble................................................................................. 109

4.15 RF Trouble Shooting .............................................................. 121

5. DOWNLOAD................................................................... 139

6. BLOCK DIAGRAM........................................................... 155

7. CIRCUIT DIAGRAM ........................................................ 161

8. BGA Pin Map.................................................................. 171

9. PCB LAYOUT................................................................... 176

10. CALIBRATION............................................................... 183

10.2 Usage of Tachyon for RF Calibration and Test ............. 183

11. TEST MODE .................................................................. 186

12. EXPLODED VIEW & REPLACEMENT PART LIST ......... 191

12.1 EXPLODED VIEW...................................................................... 191

12.2 Replacement Parts.................................................................. 193

12.3 Accessory ................................................................................... 207

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LGE Internal Use Only

1. INTRODUCTION

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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 LG-S310.

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 might 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 LG-S310 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 LG-S310 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

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Only for training and service purposes LGE Internal Use Onl

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

LG-S310 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.

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LGE Internal Use Only

1. INTRODUCTION

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Only for training and service purposes LGE Internal Use Onl

1.3 ABBREVIATION

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

୛CLA Cigar Lighter Adapter

୛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

୛EGPRS Enhanced General Packet Radio Service

୛EDGE Enhanced Data rates for GSM Evolution

୛EL Electroluminescence

୛ESD Electrostatic Discharge

୛FPCB Flexible Printed Circuit Board

୛GMSK Gaussian Minimum Shift Keying

୛GPIB General Purpose Interface Bus

୛GPRS General Packet Radio Service

୛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

୛LGE LG Electronics

୛OPLL Offset Phase Locked Loop

୛PAM Power Amplifier Module

୛PCB Printed Circuit Board

୛PGA Programmable Gain Amplifier

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1. INTRODUCTION

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Only for training and service purposes LGE Internal Use Onl

୛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

୛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

୛8PSK 8 Phase Shift Keying

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LGE Internal Use Only

2. PERFORMANCE

2. Phone Information

2.1 HW Feature

Model Name LG-S310 ( Bar )

Dimensions 114 x 48.4 x 10.5Size

Weight (w/ Battery) 86g

Network EDGE,GSM Quad 850/900/1800/1900

BB(ARM9 208MHz) MT6235Chip Set

RF( Full EDGE) AD6546

MCP(Flash / RAM) 1G NAND/512 SDRAMMemory

Card Slot microSD, up to 4GB

TYPE TFTDisplay

Size 2.2 inch 176 x 220(QCIF)

Resolution 3M FF CMOSCAMERA

Flash NA

Bluetooth V2.1 with A2DPDATA

USB microUSB v2.0

ReceiverSound

Speaker 16 Φ / SPK Phone Support

LGIP-550N Li-ion 900mAh

Standby Time Over 290 hour @Period 5

BATTERY

Talk Time Over 3hours@GSM Tx Level 5

FM Wired + Wireless(w/o india )

SNS Facebook,Twitter,China Local

Messaging SMS, MMS, E-Mail

FEATURES

Web Brower WAP 2.0

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2. PERFORMANCE

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2.2 RF Spec.

GSM850 EGSM900 DCS1800 PCS1900

Frequency [MHz]

Uplink/Downlink

824-849

869-894

880-915

925-960

1710-1785

1805-1880

1850-1910

1930-1990

Tx/Rx Spacing 45 MHz 45 MHz 95 MHz 80 MHz

Phase Error RMS 5° Peak : 20 °

Frequency Error 0.1 ppm 0.1ppm 0.1ppm 0.1ppm

EMC < -28dBm < -28dBm < -28dBm < -28dBm

Transmitter Output

Power

5dBm – 33dBm ± 3dB

0dBm – 30dBm ± 3dB

Transmitter Output

Power (EDGE)

5dBm – 26dBm ± 3dB

4dBm – 26dBm ± 3dB

Burst Timing <3.69us

Spectrum due to

modulation out to less

than 1800kHz offset

200kHz : -36dBm

600kHz : -51dBm/-56dBm

Spectrum due to

modulation out to

larger than 1800kHz

offset to the edge of

the transmit band

GSM :

1800-3000kHz :< -63dBc

(-46dBm)

3000kHz-6000kHz : <-65dBc

(-46dBm)

6000kHz < : < -71dBc

(-46dBm)

DCS :

1800-3000kHz :< -65dBc

(-51dBm)

6000kHz < : < -73dBc

(-51dBm)

Spectrum due to

switching transient

400kHz : -19dBm/-22dBm(5/0), -23dBm

600kHz : -21dBm/-24dBm(5/0), -26dBm

Reference Sensitivity –

TCH/FS Class II(RBER) : -105dBm(2.439%)

Usable receiver input

level range 0.012(-15 - -40dBm)

Intermodulation

rejection – Speech

channels

± 800kHz, ± 1600kHz : -98dBm/-96dBm (2.439%)

Timing Advance ± 0.5T

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LGE Internal Use Only

3. TECHNICAL BRIEF

3.1 General Description

The LG-S310 supports GSM850, GSM-900, GSM-1800, and GSM-1900 based GSM/GPRS/EDGE.

RF Transceiver(AD6546) is a fully integrated Quad band GSM Transceiver with an advanced modulator design

that fully supports 8-PSK EDGE modulation format. The AD6546 contains a translation loop modulator for

directly modulating baseband signals onto an integrated Tx VCO.

[Figure 3.1-1] Block Diagram of RF part

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[Figure 3.1-1] Block Diagram of RF part

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3. TECHNICAL BRIEF

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3.2 GSM Part

3.2.1 GSM Receiver

The LG-S310 receiver section fully integrates all the RF and baseband signal processing. Each block is

described in the following sections.

[Figure 4.2.1-1] GSM Receiver Path

Low Noise Amplifiers

The LNAs have differential inputs which help minimize the effect of unwanted interferers. The inputs are

easily matched to industry standard FEMs or discrete Rx SAW filters. The outputs of the LNAs are directly

coupled to the down-converting mixers. The voltage gain of the LNAs is typically 24 dB. Each LNA can be

switch to a low gain mode when receiving large input signals as part of the AGC system.

Down-Converting Mixers

Two quadrature mixers are used to mix down the signals from the LNAs, one for the high bands (1800 and

1900 MHz) and one for the low bands (850 and 900 MHz). The outputs of the mixers are connected to the

baseband section through an integrated single pole filter with nominal cut-off frequency of 800kHz. This acts

as a “roofing filter” for the largest blocking signals (i.e. those ≥ 3MHz) and prevents the baseband amplifiers

from being overloaded.

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The translation loop modulator and Tx VCO are extremely low noise removing the need for external TX

filtering. To support EDGE modulation with high PA efficiency the design includes a full polar modulation

architecture including PA linearization. To reduce BOM the TX PLL loop filter components are fully integrated.

The AD6546 uses the industry proven direct conversion receiver architecture of the OthelloTM family. For

Quad band applications the front End features four fully integrated differential LNAs with programmable-

gain. The RF is downconverted by quadrature mixers and then fed to the baseband programmable-gain

amplifiers and active low pass filters for channel selection. The programmable-gain baseband amplifiers and

the LNA gain step are set via a standard 3-wire serial bus. 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 AD6546 uses a single integrated LO VCO for both receive and the transmit paths. The

synthesizer lock times are optimized for EGPRS applications up to and including class 12. The AD6546

contains three on-chip low dropout voltage regulators(LDOs). These maintain the correct supply voltages to

the on chip circuits with a wide range of battery voltage input. Comprehensive power down options are

included to minimize power consumption in normal use.

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LGE Internal Use Only

3. TECHNICAL BRIEF

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Receive Local Oscillator (LO) Generator

The LO generator is used to convert the synthesized VCO signal to the on-frequency quadrature LO required

by the receiver. By operating the VCO at a frequency other than the desired receive frequencies, any leakage

of the VCO (e.g. via package) will fall out of band. The LO generator is implemented as a regenerative

frequency divider, performing a 2/3 multiplication of the synthesized-LO for the high band

(DCS1800/PCS1900) and a 1/3 multiplication for low band (GSM900/GSM850).

Baseband Amplifiers / Low Pass Filters

The baseband amplifiers provide the majority of the analog receiver gain. The filtering is provided by an

integrated 5th order Chebyshev filter giving the necessary adjacent channel and blocking filtering, it is also

acting as an anti-alias filtering for Baseband Converter ICs. The output stage includes an internal resistance so

a final low pass pole can be created with external shut capacitors, if necessary. The on chip filter has an auto

calibration feature ensuring that the filters are tuned for optimum performance in both EDGE and GSM

modes.

[Figure 3.2.1-2] Receiver Baseband Section

The baseband amplifiers have programmable gain for system AGC. A total of 57 dB of gain control is provided

in 3dB steps programmable over the serial interface. This together with the LNA gain control gives a total of

77dB of gain control range. The receive baseband outputs are routed to the common Rx/Tx I/Q ports for

connection with the baseband converters.

Baseband Output D.C. Offset Correction

In order to minimize DC offsets inherent in the receiver and maximize dynamic range a DC offset correction

circuit is integrated. The one-off calibration is triggered over the serial bus upon initialization and then a fully

automatic offset tracking loop is enabled to minimize residual offsets during operation.

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3.2 GSM Part

3.2.1 GSM Receiver

The LG-S310 receiver section fully integrates all the RF and baseband signal processing. Each block is

described in the following sections.

[Figure 4.2.1-1] GSM Receiver Path

Low Noise Amplifiers

The LNAs have differential inputs which help minimize the effect of unwanted interferers. The inputs are

easily matched to industry standard FEMs or discrete Rx SAW filters. The outputs of the LNAs are directly

coupled to the down-converting mixers. The voltage gain of the LNAs is typically 24 dB. Each LNA can be

switch to a low gain mode when receiving large input signals as part of the AGC system.

Down-Converting Mixers

Two quadrature mixers are used to mix down the signals from the LNAs, one for the high bands (1800 and

1900 MHz) and one for the low bands (850 and 900 MHz). The outputs of the mixers are connected to the

baseband section through an integrated single pole filter with nominal cut-off frequency of 800kHz. This acts

as a “roofing filter” for the largest blocking signals (i.e. those ≥ 3MHz) and prevents the baseband amplifiers

from being overloaded.

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3. TECHNICAL BRIEF

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Receive Local Oscillator (LO) Generator

The LO generator is used to convert the synthesized VCO signal to the on-frequency quadrature LO required

by the receiver. By operating the VCO at a frequency other than the desired receive frequencies, any leakage

of the VCO (e.g. via package) will fall out of band. The LO generator is implemented as a regenerative

frequency divider, performing a 2/3 multiplication of the synthesized-LO for the high band

(DCS1800/PCS1900) and a 1/3 multiplication for low band (GSM900/GSM850).

Baseband Amplifiers / Low Pass Filters

The baseband amplifiers provide the majority of the analog receiver gain. The filtering is provided by an

integrated 5th order Chebyshev filter giving the necessary adjacent channel and blocking filtering, it is also

acting as an anti-alias filtering for Baseband Converter ICs. The output stage includes an internal resistance so

a final low pass pole can be created with external shut capacitors, if necessary. The on chip filter has an auto

calibration feature ensuring that the filters are tuned for optimum performance in both EDGE and GSM

modes.

[Figure 3.2.1-2] Receiver Baseband Section

The baseband amplifiers have programmable gain for system AGC. A total of 57 dB of gain control is provided

in 3dB steps programmable over the serial interface. This together with the LNA gain control gives a total of

77dB of gain control range. The receive baseband outputs are routed to the common Rx/Tx I/Q ports for

connection with the baseband converters.

Baseband Output D.C. Offset Correction

In order to minimize DC offsets inherent in the receiver and maximize dynamic range a DC offset correction

circuit is integrated. The one-off calibration is triggered over the serial bus upon initialization and then a fully

automatic offset tracking loop is enabled to minimize residual offsets during operation.

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Receive Local Oscillator (LO) Generator

The LO generator is used to convert the synthesized VCO signal to the on-frequency quadrature LO required

by the receiver. By operating the VCO at a frequency other than the desired receive frequencies, any leakage

of the VCO (e.g. via package) will fall out of band. The LO generator is implemented as a regenerative

frequency divider, performing a 2/3 multiplication of the synthesized-LO for the high band

(DCS1800/PCS1900) and a 1/3 multiplication for low band (GSM900/GSM850).

Baseband Amplifiers / Low Pass Filters

The baseband amplifiers provide the majority of the analog receiver gain. The filtering is provided by an

integrated 5th order Chebyshev filter giving the necessary adjacent channel and blocking filtering, it is also

acting as an anti-alias filtering for Baseband Converter ICs. The output stage includes an internal resistance so

a final low pass pole can be created with external shut capacitors, if necessary. The on chip filter has an auto

calibration feature ensuring that the filters are tuned for optimum performance in both EDGE and GSM

modes.

[Figure 3.2.1-2] Receiver Baseband Section

The baseband amplifiers have programmable gain for system AGC. A total of 57 dB of gain control is provided

in 3dB steps programmable over the serial interface. This together with the LNA gain control gives a total of

77dB of gain control range. The receive baseband outputs are routed to the common Rx/Tx I/Q ports for

connection with the baseband converters.

Baseband Output D.C. Offset Correction

In order to minimize DC offsets inherent in the receiver and maximize dynamic range a DC offset correction

circuit is integrated. The one-off calibration is triggered over the serial bus upon initialization and then a fully

automatic offset tracking loop is enabled to minimize residual offsets during operation.

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LGE Internal Use Only

3. TECHNICAL BRIEF

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3.2.2 GSM Transmitter

The highly integrated transmit section of the AD6546 radio has been designed to fully support 8 PSK

modulation for EDGE applications, and GMSK modulation for GSM. A translational loop is used for phase

modulation, and for 8 PSK additional envelope (AM) circuits are enabled to implement a Polar modulator. This

provides a high quality & high efficiency GMSK / 8PSK modulation system with a minimum of external

components. The Transmit modulator blocks are described in the following sections.

[Figure 3.2.2-1] GSM Transmitter Path

Quadrature Modulator

The Quadrature modulator takes the baseband I/Q signals and converts this onto a complex modulated

signal (containing both amplitude and phase information) at the TX IF frequency. After bandpass filtering

the TX IF signal is used as the reference input to the Phase Frequency Detector (PFD) for the transmit PLL, and

in EDGE mode also provides the input to the Reference Path Log Detector circuit for AM restoration. The

modulator also contains a fully automatic DC offset calibration routine ensuring Origin offset requirements

are comfortably met.

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Phase Frequency Detector (PFD)

This ensures that the transmitted signal is accurately locked to the desired frequency with the desired TX

phase modulation. The downconverted feedback signal from the PA is phase locked to the reference

quadrature modulator output by the PFD charge pump output supplying current to the loop filter. The filter

is autocalibrated together with the RX baseband filters to remove any process tolerances.

TX VCO

The Transmit Voltage Controlled Oscillator (TX VCO) and tank components are a fully integrated subsystem.

The subsystem includes PA drivers so the outputs are used to directly drive the external PAs. In Low band

operation the TX VCO output is divided by two and filtered.

Feedback Path

The feedback path is modified from the standard GMSK Translational loop, by inclusion of the Power

Amplifier (PA), as shown in Figure 4.2.2-1. This enhancement means the loop corrects for AM to PM distortion

that is generated in the PA with non constant-envelope modulation. The feedback signal is coupled from the

PA output and applied to a successive detection log/limiting amplifier. The limiting function removes the

amplitude information from the feedback and applies the phase information to the translational loop via the

feedback down converting mixer. The detector output is used in the AM loop. The feedback down converting

mixer is used to translate the amplitude limited feedback signal to the TX IF Frequency. The subsequent

integrated band pass filter removes the mixers unwanted side band and higher order mixing products, prior

to the PFD input. A Fully integrated TX Sequencer manages phase locking prior to PA ramping.

AM Loop

The Polar modulator architecture also contains an amplitude loop for control of the PA output power. This

allows the AM content of the 8PSK modulation to be efficiently and accurately transmitted by a Polar PA

significantly exceeding spectral mask requirements. Non linear and distortion effects created in the PA are

automatically corrected by the loop, enabling ease of use in operation and minimal factory calibration.

The Output of the Modulator is fed to a high dynamic range Log Detector. The detector extracts the AM

content from the modulator output, which is used as the reference in the AM loop. The feedback path

consists of a coupler on the PA output and a high dynamic range matched Log Detector. Both signals are fed

to the Amplitude controller block.

The Amplitude controller block takes inputs from both the Reference and Feedback Detectors and from the

RAMP input terminal. Using various signal processing techniques an error term is generated which is fed into

an integrator. The integrator output voltage is used to drive the PA Power control input pin. To support a

variety of PA models the Amplitude Controller gain slope can be programmed via the serial bus. The

amplitude controller includes a DAC for precise alignment of the feedback path loop. This is achieved by a

onetime simple factory power calibration procedure. Unwanted amplitude variations in the reference path

(eg. IQ input level) are removed by a track and hold circuit integrated into the Amplitude Controller block. In

GMSK mode the reference detector circuit is powered down, but the RAMP input remains active meaning no

external circuitry or switching is required for PA control in ether mode.

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