Lg Lg-a270 User manual

Internal Use Only

Service Manual

LG-A270

Date: April, 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. SYSTEM SPECIFICATION ....................................................... 7

2.1 H/W Features..............................................................................................7

2.2 Technical Specication...........................................................................9

3. TECHNICAL BRIEF................................................................ 14

3.1 Digital Main Processor......................................................................... 14

3.2 Power Management ............................................................................ 17

3.3 FEM with integrated Power Amplier Module

(SKY77550, U300).................................................................................. 22

3.4 Crystal(26 MHz, X100) ......................................................................... 24

3.5 RFSYS of MT6251 (U100).................................................................... 25

3.6 MEMORY(FM25Q32, U101) ............................................................... 27

3.7 SIM Card Interface................................................................................. 29

3.8 Display Interface.................................................................................... 30

3.9 Battery Charger Interface................................................................... 32

3.10 Keypad Interface................................................................................. 33

3.11 Audio Front-End.................................................................................. 35

3.12 KEY BACLKLIGHT LED Interface .................................................... 38

3.13 Vibrator Interface................................................................................ 39

3.14 Torch LED Interface............................................................................ 40

3.15 Micro SD Card Interface ................................................................... 41

4. TROUBLE SHOOTING .......................................................... 42

4.1 RF Component ....................................................................................... 42

4.2 RX Trouble ................................................................................................ 43

4.3 TX Trouble................................................................................................. 47

4.4 FM Radio Trouble (Wired 3.5 phi/wireless) ................................. 51

4.5 Power On Trouble.................................................................................. 53

4.6 Charging Trouble................................................................................... 56

4.7 Vibrator Trouble ..................................................................................... 58

4.8 LCD Trouble ............................................................................................. 60

4.9 Speaker Trouble ..................................................................................... 62

4.10 Earphone Trouble ............................................................................... 65

4.11 Microphone Trouble.......................................................................... 68

4.12 SIM Card Interface Trouble.............................................................. 70

4.13 KEY backlight Trouble ...................................................................... 72

4.14 Torch Light Trouble ........................................................................... 74

4.15 Micro SD Trouble ................................................................................ 76

5. DOWNLOAD......................................................................... 78

6. BLOCK DIAGRAM................................................................. 91

7. CIRCUIT DIAGRAM .............................................................. 92

8. BGA PIN MAP ...................................................................... 96

9. PCB LAYOUT......................................................................... 97

10. ENGINEERING MODE ........................................................ 99

11.AUTO CALIBRATION.........................................................100

11.1 Overview..............................................................................................100

11.2 Directory structure of Tachyon....................................................100

11.3 Description of Folder & File...........................................................101

11.4 How to use Tachyon.........................................................................102

11.5 Target Power.......................................................................................105

12. EXPLODED VIEW & REPLACEMENT PART LIST .............106

12.1 EXPLODED VIEW................................................................................106

12.2 Replacement Parts ...........................................................................107

12.3 Accessory .............................................................................................119

Only for training and service purposes

LGE Internal Use Only

1. INTRODUCTION

O nly for training and service purposes

LGE Internal Use Only 0

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

O nly for training and service purposes

LGE Internal Use Only 1

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

bythe sign. Following information is ESD handling:

rService personnel should ground themselves by using a wrist strap when exchange system

boards.

rWhen repairs are made to a system board, they should spread the floor with anti-static mat

which is also grounded.

rUse a suitable, grounded soldering iron.

rKeep sensitive parts in these protective packages until these are used.

rWhen returning system boards or parts like EEPROM to the factory, use the protective

package as described.

1. INTRODUCTION

Only for training and service purposes

LGE Internal Use Only

1. INTRODUCTION

O nly for training and service purposes

LGE Internal Use Only 2

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

Only for training and service purposes

LGE Internal Use Only

1. INTRODUCTION

O nly for training and service purposes

LGE Internal Use Only 3

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. SYSTEM SPECIFICATION

Only for training and service purposes

LGE Internal Use Only

O nly for training and service purposes

LGE Internal Use Only 4

2. SYSTEM SPECIFICATION

2.1 H/W Features

Item Feature Comment

Standard Battery Lithium-ion , 3.7V 950mAh

Stand by TIME Up to 950 hrs : Paging Period 9, RSSI 85dBm

Talk time Up to 8 hrs : GSM Tx Level 10

Charging time Approx. 3.5 hours

RX Sensitivity GSM, EGSM: -108dBm, DCS: -108dBm

TX output power GSM, EGSM: 32.5dBm(Level 5),

DCS , PCS: 29.5dBm(Level 0)

SIM card type 3V Small

Display MAIN : 1.45” TFT 128 ×128 pixel 65K Color

Status Indicator

Hard icons. Key Pad

0 ~ 9, #, *, Up/Down Left/Right Navigation Key

Send Key, PWR Key ,Soft Key(Left/Right)

ANT Internal

EAR Phone Jack Yes

PC Synchronization Not Support

Speech coding EFR/FR/HR

Data and Fax Yes

GPRS compatibility Not Support

Vibrator Yes

Loud Speaker Yes

Voice Recoding Not Support

Microphone Yes

2. SYSTEM SPECIFICATION

2.1 H/W Features

2. SYSTEM SPECIFICATION

Only for training and service purposes

LGE Internal Use Only

O nly for training and service purposes

LGE Internal Use Only 5

2. SYSTEM SPECIFICATION

Travel Adapter Yes

Speaker/Receiver 18x12Φ Speaker/ Receiver

MIDI 32 poly

Item Feature Comment

Camera Not Support

FM Radio Yes

2. SYSTEM SPECIFICATION

Only for training and service purposes

LGE Internal Use Only

O nly for training and service purposes

LGE Internal Use Only 6

2.2 Technical Specification

Item Description Specification

1 Frequency Band

EGSM

TX: 880 ~ 915MHz

RX: 925 ~ 960 MHz

DCS

TX: 1710 ~ 1785 MHz

RX: 1805 ~ 1880 MHz

2 Phase Error RMS < 5 degrees

Peak < 20 degrees

3 Frequency Error < 0.1 ppm

4 Power Level

Level Power Toler. Level Power Toler.

6 31dBm ±3dB 14 15dBm ±3dB

7 29dBm ±3dB 15 13dBm ±3dB

8 27dBm ±3dB 16 11dBm ±5dB

9 25dBm ±3dB 17 9dBm ±5dB

10 23dBm ±3dB 18 7dBm ±5dB

11 21dBm ±3dB 19 5dBm ±5dB

12 19dBm ±3dB

GSM850/EGSM

5 33dBm ±2dB 13 17dBm ±3dB

Level Power Toler. Level Power Toler.

1 28dBm ±3dB 9 12dBm ±4dB

2 26dBm ±3dB 10 10dBm ±4dB

3 24dBm ±3dB 11 8dBm ±4dB

4 22dBm ±3dB 12 6dBm ±4dB

5 20dBm ±3dB 13 4dBm ±4dB

6 18dBm ±3dB 14 2dBm ±5dB

7 16dBm ±3dB 15 0dBm ±5dB

DCS/PCS

0 30dBm ±2dB 8 14dBm ±3dB

2. SYSTEM SPECIFICATION

2.2 Technical Specication

2. SYSTEM SPECIFICATION

Only for training and service purposes

LGE Internal Use Only

O nly for training and service purposes

LGE Internal Use Only 7

5Output RF Spectrum

(due to modulation)

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

6,000 -71

GSM850/ EGSM

Offset from Carrier (kHz). Max. dBc

100 +0.5

200 -30

250 -33

400 -60

600~ <1,200 -60

1,200~ <1,800 -60

1,800~ <3,000 -65

3,000~ <6,000 -65

6,000 -73

DCS/PCS

Output RF Spectrum

(due to switching

transient)

GSM850/ EGSM

Offset from Carrier (kHz). Max. dBm

400 -19

600 -21

1,200 -21

1,800 -24

Item Description Specification

2. SYSTEM SPECIFICATION

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