Lg Lg-840g User manual

Internal Use Only

Service Manual

LG840G

Date: September, 2012 / Issue 1.0

Only for training and service purposes

LGE Internal Use Only

Table Of Contents

1. INTRODUCTION..................................................................... 3

1.1 Purpose....................................................................................................3

1.2 Regulatory Information ....................................................................3

1.3 Abbreviations........................................................................................5

2. PERFORMANCE...................................................................... 7

2.1 System......................................................................................................7

2.2 Using Conditio......................................................................................7

2.3 Accessary ................................................................................................7

2.4 Network...................................................................................................8

2.5 Current Consumption..................................................................... 13

2.6 Usage Time ( AT & T spec).............................................................. 13

2.7 RSSI......................................................................................................... 13

2.8 Battery Bar........................................................................................... 14

2.9 Heat Emissio ....................................................................................... 14

2.10 Color Temperature......................................................................... 14

2.11 LG840G Figure.................................................................................15

3. TECHNICAL BRIEF................................................................ 16

3.1 RF Technical Description................................................................16

3.2 WCDMA Part....................................................................................... 17

3.3 EDGE/GPRS/GSM RF block............................................................ 23

3.4 Control Flow ....................................................................................... 29

3.5 BB Technica Description ................................................................ 30

3.6 Power management........................................................................ 42

4. TROUBLE SHOOTING .......................................................... 45

4.1 RF Component...................................................................................45

4.2 RF Path..................................................................................................47

4.3Trouble Shooting of GSM Part (GSM850/900/1800/1900)

......................................................................................................................... 49

4.4Trouble Shooting of WCDMA Part............................................. 58

4.5 Checking Bluetooth Block ............................................................ 66

4.6 Checking WiFi Block ........................................................................ 69

4.7 Checking GPS Block......................................................................... 72

4.8 Power ONTroubleshooting..........................................................76

4.9 Charger Troubleshooting.............................................................. 79

4.10 USB Troubleshooting.................................................................... 80

4.11 USIM Detect Troubleshooting..................................................82

4.12 Camera Troubleshooting............................................................ 85

4.13 Main Keypad BacklightTroubleshooting.............................87

4.14 LCD Troubleshooting.................................................................... 88

4.15 Vibrator............................................................................................... 90

4.16 Receiver Path................................................................................... 91

4.17 Headset path ................................................................................... 93

4.18 Speaker phone path..................................................................... 95

4.19 Main microphone.......................................................................... 97

4.20 Headset microphone.................................................................... 99

5. DOWNLOAD.......................................................................101

6. BLOCK DIAGRAM...............................................................120

7. CIRCUIT DIAGRAM ............................................................130

8. BGA PIN MAP.....................................................................141

9. PCB LAYOUT.......................................................................145

10. CALIBRATION...................................................................153

10.1 Conguration ofTachyon.........................................................153

10.2 How to use Tachyon....................................................................156

11. EXPLODED VIEW & REPLACEMENT PART LIST .............158

11.1 EXPLODED VIEW...........................................................................158

11.2 Replacement Parts.......................................................................161

11.3 Accessory ........................................................................................186

Only for training and service purposes

LGE Internal Use Only

1. INTRODUCTION

Only for training and service purposes

LGE Internal Use Only 4/140

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

Only for training and service purposes

LGE Internal Use Only

1. INTRODUCTION

Only for training and service purposes

LGE Internal Use Only 5/140

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.

2. INTRODUCTION

Only for training and service purposes

LGE Internal Use Only

1. INTRODUCTION

Only for training and service purposes

LGE Internal Use Only 6/140

1.3 Abbreviations

For the purposes of this manual, following abbreviations apply:

Offset Phase Locked LoopOPLL

Light Emitting DiodeLED

Low Drop OutputLDO

Liquid Crystal DisplayLCD

Intermediate FrequencyIF

International Portable User IdentityIPUI

Global System for Mobile CommunicationsGSM

General Purpose Interface BusGPIB

Gaussian Minimum Shift KeyingGMSK

Flexible Printed Circuit BoardFPCB

Electrostatic DischargeESD

Electrical Erasable Programmable Read-Only MemoryEEPROM

Digital Signal ProcessingDSP

dB relative to 1 milli wattdBm

Digital Communication SystemDCS

Digital to Analog ConverterDAC

Constant Current – Constant VoltageCC-CV

Bit Error RatioBER

BasebandBB

Automatic Power ControlAPC

1. INTRODUCTION

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LGE Internal Use Only

1. INTRODUCTION

Only for training and service purposes

LGE Internal Use Only 7/140

Wireless Application Protocol

WAP

Voltage Control Temperature Compensated Crystal OscillatorVCTCXO

Voltage Controlled OscillatorVCO

Universal Asynchronous Receiver/TransmitterUART

Time Division Multiple AccessTDMA

Time Division DuplexTDD

Travel AdapterTA

Side Tone Masking RatingSTMR

Pseudo SRAMPSRAM

Static Random Access MemorySRAM

Sending Loudness RatingSLR

Subscriber Identity ModuleSIM

Surface Acoustic WaveSAW

Real Time ClockRTC

Root Mean SquareRMS

Receiving Loudness RatingRLR

Radio FrequencyRF

Public Switched Telephone NetworkPSTN

Phase Locked LoopPLL

Programmable Gain AmplifierPGA

Printed Circuit BoardPCB

Power Amplifier ModulePAM

1. INTRODUCTION

2. PERFORMANCE

Only for training and service purposes

LGE Internal Use Only

2. PERFORMANCE

2.1 System

2 Using Condition

Item Type / Spec.

1.Type DOP

2.Size 103.6 x 59.8 x 11.7mm

3.Weight 110.9±5.5g (1000mAh Battery)

4.Battery 1000 mAh (Li-Ion)

5.LCD Type TFT QVGA LCD(3.2”)

6.Accessory

1) Travel Adaptor

2) USB Cable

3) Ear-Mic Set

4) Micro SD

1) Input : AC 100~240V , Output : 5.1V, 700mA

2) Micro-USB type(Not in Box)

3) 3.5phi Ear Phone(Not in Box)

4) 2GBYTE

Item Spec. Min. Typ. Max. Unit

Output

Voltage

DC Power 5.1 Vdc

Battery Power 3.2 3.7 4.2 Vdc

Input Voltage 100 110 240 Vac

Using

Temperature 0 47 ℃

2.3 Accessary

Input : AC 100~240VOutput: 5.1V, 700mATravel Adapter

Charging Voltage : 4.2V

Standart Charging Current: 500mA

Li-Ion Polymer, 1000mAhBattery

RemarkType/Spec.Item

SD Card 2GBYTE MICRO SD CARD 15.0x11.0x1.0MM

TR 8P 2GB MicroSD Card

2.1 System

2.2 Using Condition

2.3 Accessary

2. PERFORMANCE

Only for training and service purposes

LGE Internal Use Only

2.4 Network

1) GSM Tx/Rx Frequecy characteristics

Item Specification

Phase Error Rms : 5°

Peak : 20 °

Frequency Error GSM : 0.1 ppm

DCS/PCS : 0.1 ppm

EMC(Radiated Spurious Emission

Disturbance) GSM/DCS : < -28dBm

Transmitter Output power and Burst

Timing

GSM : 5dBm – 33dBm ±3dB

DCS/PCS : 0dBm – 30dBm ±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%)

AM Suppression

-GSM : -31dBm - DCS : -29dBm -98dBm/-96dBm (2.439%)

Timing Advance ±0.5T

2.4 Network

1) GSM Tx/Rx Frequecy characteristics

2. PERFORMANCE

Only for training and service purposes

LGE Internal Use Only

2) WCDMA Tx/Rx Frequecy characteristics

Item Specification

Transmit Frequency WCDMA850 : 824 MHz ~ 849 MHz

WCDMA1900 : 1850 ~ 1910 MHz

Maximum Output Power +24 dBm / 3.84 MHz, +1 / -3 dB

Frequency Error within ±0.1 PPM

Open Loop Power Control Normal Conditions : within ±9 dB,

Extreme Conditions : within ±12 dB

Minimum Transmit Power < -50 dBm /3.84 MHz

Occupied Bandwidth < 5 MHz at 3.84 Mcps (99% of power)

Adjacent Channel Leakage

Power Ratio (ACLR)

> 33 dB @ ±5 MHz,

> 43 dB @ ±10 MHz

Spurious Emissions

|f-fc| > 12.5 MHz

< -36 dBm / 1 kHz RW @ 9 kHz ≤ f < 150 kHz

< -36 dBm / 10 kHz RW @ 150 KHz ≤ f < 30 MHz

< -36 dBm / 100 kHz RW @ 30 MHz ≤ f < 1 GHz

< -30 dBm / 1 MHz RW @ 1 GHz ≤ f < 12.75 GHz

< -41 dBm / 300 kHz RW @ 1893.5 MHz < f < 1919.6 MHz

< -67 dBm / 100 kHz RW @ 925 MHz ≤ f ≤ 935 MHz

< -79 dBm / 100 kHz RW @ 935 MHz < f ≤ 960 GHz

< -71 dBm / 100 kHz RW @ 1805 MHz ≤ f ≤ 1880 MHz

Transmit Inter-modulation < -31 dBc @ 5 MHz & < -41 dBc @ 10 MHz

when Interference CW Signal Level = -40 dBc

Error Vector Magnitude < 17.5 %, when Pout ≥ -20 dBm

Peak Code Domain Error < -15 dB at Pout ≥-20 dBm

2) WCDMA Tx/Rx Frequecy characteristics

2. PERFORMANCE

Only for training and service purposes

LGE Internal Use Only

3) WCDMA Rx Frequecy characteristics

Item Specification

Receive Frequency WCDMA850 : 849 MHz ~ 894 MHz

WCDMA1900 : 1930MHz ~ 1990 MHz

Reference Sensitivity Level BER < 0.001 when Îor = -106.7 dBm / 3.84 MHz

Maximum Input Level BER < 0.001 when Îor = -25 dBm / 3.84 MHz

Adjacent Channel Selectivity

(ACS)

ACS > 33 dB where BER < 0.001 when Îor = -92.7 dBm / 3.84 MHz

& Ioac = –52 dBm / 3.84 MHz @ ±5 MHz

Blocking Characteristic

BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz

& Iblocking = -56 dBm / 3.84 MHz @ Fuw(offset) = ±10 MHz

or Iblocking = -44 dBm / 3.84 MHz @ Fuw(offset) = ±15 MHz

Spurious Response BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz & Iblocking = -44 dBm

Intermodulation

BER < 0.001 when Îor= -103.7 dBm / 3.84 MHz

& Iouw1 = -46 dBm @ Fuw1(offset) = ±10 MHz

& Iouw2 = -46 dBm / 3.84 MHz @ Fuw2(offset) = ±20 MHz

Spurious Emissions < -57 dBm / 100 kHz BW @ 9 kHz ≤ f < 1 GHz

< -47 dBm / 1 MHz BW @ 1 GHz ≤ f ≤ 12.75 GHz

3) WCDMA Rx Frequecy characteristics

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