LG A290 SERVICE MANUAL

Date:Feb 2016 / Ver. 1.0

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL

MOBILE PHONE

SERVICE MANUAL

CAUTION

MODEL : LG-K430DSF

Table Of Contents

2

reserved. Only training and service purposes

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1.

INTRODUCTION ............................................... 3

1.1 Purpose

1.2 Regulatory Information

6. BGA PIN MAP............................................................

7. PCB LAYOUT…...........................................................

219

21:

2.

PERFORMANCE. ................................................. 4

2.1 Band Specification

2.2 HW Features

2.3 RSSI Display

2.4 Current consumption

8. HIDDEN MENU..........................................................

9. DOWNLOAD…...........................................................

10. CALIBRATION..........................................................

227

22:

231

2.5 Battery bar

2.6 SW Specification

11. DISASSEMBLE GUIDE.............................................

232

3.

TROUBLE SHOOTING. ........................................ 13

3.2 Transceiver DC Power Supply Circuit Block

3.3 DC-DC Block

12. EXPLODED VIEW……………………………………….

13. REPLACEMENT PART LIST..………………………...

236

237

3.4 FEMiD(Front End Module integrated Duplexer) Block

3.5 GSM RF PART

3.6 WCDMA RF PART

3.7 LTE RF PART

3.8 Checking Wifi/BT Block

3.9 Checking GPS Block

3.10 Checking FM Block

3.11 Checking NFC Block

3.12 Power

3.13 charger

3.14 Audio

3.15 Checking LCD Block

3.16 Touch

3.17 Sensor

3.18 Checking USB Block

3.19 Camera

4. BLOCK DIAGRAM….............................................. 92

5.

CIRCUIT DIAGRAM............................................... 8:

3

reserved. Only 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

This material is prohibited to share and release to unauthorized person, in accordance with the regulations, LG Electronics, Civil / criminal

responsibility in accordance with the relevant provisions violate.

B. Precautions for repair

•

In case of Disassembly or Assembly to repair product, be careful of a product failure caused by RF signals and Static electricity.

•

When using Magnetic tool for the Phone's SVC repair, you should check affect the Electric parts according to effect of Magnet.

•

When fastening the screw, be careful not to damage the head of screw and even product.

C. Attention

Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following information is ESD handling:

•

Service personal should ground themselves by using a wrist, strap when exchange system board.

•

When repair 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 board or parts like EEPROM to the Factory, use the protective package as described.

4

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2. PERFORMANCE

2.1 Band Specification

Support Band

TX Freq (MHz)

RX Freq (MHz)

WCDMA(FDD1)

1920 – 1980

2110 – 2170

WCDMA(FDD2)

1852 – 1907

1932 – 1987

WCDMA(FDD5)

824 – 849

869 – 894

WCDMA(FDD8)

880 – 915

925 – 960

EGSM

880 – 915

925 – 960

GSM850

824 – 849

869 – 894

DCS1800

1710 – 1785

1805 – 1880

PCS1900

1850 – 1910

1930 – 1990

LTE3

1710 – 1785

1805 – 1880

LTE7

2500 – 2570

2620 – 2690

LTE28

703 – 748

758 – 803

5

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2. PERFORMANCE

2.2 HW Features

List

Type / Spec.

1. Phone Type

DOP Type

2. Size

146.6 x 74.8 x 8.8

3. Weight

127.1 g ( with Battery )

4. Battery

2300mAh(Typ) (Li-Ion)

5.Chipset

MT6753 1.14GHz Octa core

6. Memory

16GB(EMMC) + 1.5GMB(LPDDR2)

7. LCD

Size

5.3 inch

Display Type

Active matrix TFT, Transmissive Type

Color

16.7M colors

Resolution

HD (720 x 1280)

8. Touch

Type

In-Cell Touch

9. Main Camera (13M)

Type

CMOS image sensor

Resolution

13MP @ 30 FPS

Focus (Laser / OIS)

AF (X/X)

# of Flash

1EA

6

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2. PERFORMANCE

2.2 HW Features

10. Audio

Receiver/Speaker/3.5phi

1 (AMR-WB) / 1 / Yes

# of mic.

2 Audio Zoom

X

11. Bluetooth

Standard

Bluetooth 4.0

Effective Distance

10M Distance

0 m ~ 10 m (depend on environment)

12. WLAN

Standard

IEEE 802.11 b/g/n

Throughput

Max 40Mbps (SDIO Driver performance)

Depend on environment

0 ~ 50m (depend on environment)

13. GPS

type

A-GPS

14. FM

type

FM Radio, 3.5pi Ear-jack

7

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2. PERFORMANCE

RSSI BAR

GSM RSSI

WCDMA RSCP

LTE RSRP

Comment

BAR 5->4

- 91dBm± 3dB

- 89dBm± 3dB

-85dBm ± 3dB

1. Call Connecte

d & CPIPH Level =-3.3

2. LTE: RSRP

BAR 4->3

- 96dBm± 3dB

- 94dBm± 3dB

-95dBm ± 3dB

BAR 3->2

- 99dBm± 3dB

- 100dBm± 3dB

-105dBm ± 3dB

BAR 2->1

- 103dBm± 3dB

- 104dBm± 3dB

-115dBm ±3dB

BAR 1->0

- 105dBm± 3dB

- 110dBm± 3dB

-128dBm ± 3dB

RSSI BAR

GSM RSSI

WCDMA RSSI

LTE RSSI

Comment

BAR 5->4

- 91dBm± 3dB

- 86dBm± 3dB

-85dBm ± 3dB

1. Call Connecte d & CPIPH Level

=-3.3

BAR 4->3

- 96dBm± 3dB

- 91dBm± 3dB

-95dBm ± 3dB

BAR 3->2

- 99dBm± 3dB

- 97dBm± 3dB

-105dBm ± 3dB

BAR 2->1

- 103dBm± 3dB

- 101dBm± 3dB

-115dBm ±3dB

BAR 1->0

- 105dBm± 3dB

- 107dBm± 3dB

-128dBm ± 3dB

2.3 RSSI Display

8

reserved. Only training and service purposes

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2. PERFORMANCE

구분

Specification

측정 조건

Sleep mode

(WCDMA)

320h over 7 mA under

DRX 7 @ BATT Capacity : 2300mAh

Sleep mode

(GSM)

320h over 7 mA under

EGSM P5 @ BATT Capacity : 2300mAh

Sleep mode

(LTE)

320h over 7 mA under

DRX 2.56 @ BATT Capacity :2300mAh (AMR Mode)

Calling

(WCDMA)

350m over 400mA under

10dBm @ BATT Capacity :2300mAh (AMR Mode)

Calling (GSM)

350m over 400mA under

EGSM, LV5 @ BATT Capacity : 2300mAh

Calling

(LTE)

300m over 430mA under

Cat2 Tx 10dBm @ BATT Capacity : 2300mAh

Charging

time

4h 20m under

Phone off

2.4 Current consumption

-. Battery Spec. : 2,300mAh(Typ.)/3.8V/Li-Ion

9

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2. PERFORMANCE

Battery Bar

Specification

Battery Bar

Specification

Bar 20(Full)

98%

이상

Bar 9 -> Bar 8

43% -> 42%

Bar 20 -> Bar 19

98% -> 97%

Bar 8 -> Bar 7

38% -> 37%

Bar 19 -> Bar 18

93% -> 92%

Bar 7 -> Bar 6

33% -> 32%

Bar 18 -> Bar 17

88% -> 87%

Bar 6 -> Bar 5

28% -> 27%

Bar 17 -> Bar 16

83% -> 82%

Bar 5 -> Bar 4

23% -> 22%

Bar 16 -> Bar 15

78% -> 77%

Bar 4 -> Bar 3

16% -> 15%

Bar 15 -> Bar 14

73% -> 72%

Bar 3 -> Bar 2

13% -> 12%

Bar 14 -> Bar 13

68% -> 67%

Bar 2 -> Bar 1

8% -> 7%

Bar 13 -> Bar 12

63% -> 62%

Bar 1 -> Bar 0

3% -> 2%

Bar 12 -> Bar 11

58% -> 57%

Power off

1%

이하

Bar 11 -> Bar 10

53% -> 52%

Low battery pop-up

15% , 5%

Bar 10 -> Bar 9

48% -> 47%

high temperature pop-up

57도, 60도(Power off)

2.5 Battery bar

10

reserved. Only training and service purposes

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2. PERFORMANCE

2.6 SW Specification

Item

Feature

Comment

RSSI

0 ~ 5 Levels

Battery Charging

0 ~ 20 Levels

Key Volume

0 ~ 7 Level

Audio Volume

0 ~ 15 Level

Time / Date Display

Yes

Multi-Language

Yes

depending on build language

Quick Access Mode

Phone / Messaging / Browser/ Appli

cations

Phone / Contact / Messaging /

Applications

PC Sync

Yes

Speed Dial

Yes

Voice mail center -> 1 key

Profile

Yes

not same with feature phone s

etting

CLIP / CLIR

Yes

Phone Book

Name / Number / Email / Groups /

Postal addresses / Organizations / I

M / Note / Nickname / Website / Ev

ent /

There is no limitation on the n

umber of items.

It depends on available memor

y amount.

Last Dial Number

Yes

Last Received Number

Yes

Last Missed Number

Yes

Search by Number/Na

me

Yes

Group

Yes

There is no limitation on the n

umber of items.

It depends on available memor

y amount.

Fixed Dial Number

Yes

Service Dial Number

No

Own Number

Yes

My Profile (add/edit/delete are

supported)

11

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2. PERFORMANCE

2.6 SW Specification

Voice Memo

Yes

Support voice recorder

Call Reminder

No

Network Selection

Automatic

Mute

Yes

Call Divert

Yes

Call Barring

Yes

Call Charge (AoC)

No

Call Duration

Yes

SMS (EMS)

There is no limitation on the number of items

.

It depends on available memory amount.

EMS does not support.

SMS Over GPRS

Yes

EMS Melody / Picture

Send / Receive / Save

No

MMS MPEG4

Send / Receive / Save

Yes



Send / Receive : Yes



Save : depends on content type

Support video content type li st

1.

video/mp4

2.

video/h263

3.

video/3gpp2

video/3gpp

Long Message

MAX 2000 characters

The standard of Open vender

Cell Broadcast

Yes

Download

Over the Web

Game

No

Calendar

Yes

Memo

Yes

There is no limitation on the number o

f items.

It depends on available memory amo

unt.

World Clock

Yes

12

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2. PERFORMANCE

2.6 SW Specification

Unit Convert

No

Stop Watch

Yes

Wall Paper

Yes

WAP Browser

No

Support only web browser bas

ed on webkit. WAP stack and

wml are not supported.

Download Melody /

Wallpaper

Yes

Over web browser

SIM Lock

No

SIM Toolkit

Yes

MMS

Yes

OMA MMS 1.2 version

EONS

Yes

CPHS

Yes

V4.2

ENS

No

Camera

Yes

13MP AF / 5MP

Digital Zoom : x4

JAVA

No

Voice Dial

No

US English only

IrDa

No

IrRC

Bluetooth

Yes

Ver. 4.2LE [HSP, HFP, A2DP, AVR

CP, PBAP, OPP, MAP, HID, PAN,

HOGP, HDP, DID]

FM radio

Yes

GPRS

Yes

Class 12

EDGE

Yes

Class 12(Rx only)

Hold / Retrieve

Yes

Conference Call

Yes

Max. 6

DTMF

Yes

Memo pad

No

TTY

No

AMR

Yes

SyncML

No

IM

Yes

Google Hangout

Email

Yes

IMAP/POP3/SMTP/EAS

13

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3. TROUBLE SHOOTING

TP1

Main

Top

X5001

TP1

START

Check TP1

Is it 26MHz?

XO Circuit is OK.

Check next step

YES

NO

Replace X5001 and then

check TP1

Is it 26MHz?

XO Circuit is OK.

Check next step

YES

NO

The Problem may be

Logic part

Refer to Logic trouble shoot

3.1 Checking XO Block

The out put frequency(26MHz) of VTCXO(X5001) is used as the reference one of MT6169

Image

Checking Flow

Circuit Diagram

14

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

Main

Bot

TP1

TP2

START

Check TP1

+2.8V_RF is OK?

The Problem may be

Logic part

NO

Refer to

Logic trouble shoot

YES

Check TP2

The Problem may be

+1.8V_RF is OK?

NO

Logic part

Refer to

Logic trouble shoot

YES

Check next step

3.2 Checking Transceiver DC Power Supply Circuit Block

The MT6169 operating voltages used two voltage sources 1.8V and 2.8V

Checking Flow

Circuit Diagram

Image

TP1

15

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

TP1

Main

Bot

TP2

U4100

TP1

Circuit Diagram

TP2

START

Check TP1

VBAT is OK?

NO

The Problem may be

Logic part

Refer to Logic trouble

shoot

YES

Check TP2

0.5V ≤ TP2 ≤ 4.2V ?

Check U4100 Physical

NO

Damage or soldering

condition

YES

Check next step

3.3 Checking DC-DC Block

The DC-DC(MT6328, U4100) output voltages is used as the reference one of SKY77643-31

Checking Flow

Image

16

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3. TROUBLE SHOOTING

TP1

TP2

TP1

TP2

Main

Top

U1002

TP1

TP2

START

Check TP1, TP2 High Level ?

(2.5V≤TP1 ≤3.1V) (3.9V≤TP2 ≤4.2V)

NO

The Problem may be

Logic part

Refer to Logic trouble

shoot

YES

NOT GOOD

Check U1002 physical Damage

or soldering condition

Replace U1002

OK?

Check Next step

3.4 ASM(Antenna Switch Module) Block

3.4.1 Checking ANT #1 ASM (GSM 850/900, W B5/8, LTE B7/20)

Checking Flow

Image

Circuit Diagram

17

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

TP1

TP2

U1001

TP2

TP1

TP2

TP1

START

Check TP1, TP2 High Level ?

(2.5V≤TP1 ≤3.1V) (1.7V≤TP2 ≤1.9V)

NO

The Problem may be

Logic part

Refer to Logic trouble

shoot

YES

NOT GOOD

Check U1001 physical Damage

or soldering condition

Replace U1001

OK?

Check Next step

3.4 ASM(Antenna Switch Module) Block

3.4.2 Checking ANT #2 ASM (GSM 1800/1900, W B1 B2, LTE B3)

Image

Checking Flow

Circuit Diagram

18

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

3.5 GSM RF PART

GSM RF Part support GSM850/900/1800/1900 with ASM, PAM, Transceiver component

Checking Flow

START

Check XO Block

Refer 3.1

Check Transceiver DC Power supply Block

Refer 3.2

Check DC-DC Block

Refer 3.3

Check ASM Block

Refer 3.4

Check T/RX Block

Re-Download & Cal

Change the Board

19

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3. TROUBLE SHOOTING

Main

Top

Main

BOT

SW1001

SW1002

1. GSM850 RX PATH

2. GSM900 RX PATH

3. GSM1800 RX PATH

4. GSM1900 RX PATH

3.5 GSM RF PART

3.5.1 GSM RF Part RX RF PATH

Image

20

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

START

Check TP1 Signal exist?

Check

SW1002

NO

Soldering

YES

Check TP2 Signal exist?

NO

Check

U1001

Soldering

YES

Check next step

U1001

TP2

TP1

TP2

3.5 GSM RF PART

3.5.2 Checking RF Signal RX path(SW, GSM850/900)

Checking Flow

Main

Top

TP1 TP2

Circuit Diagram

Image

TP1

21

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

TP2

TP1

TP3

Main

Top

FL1104

FL1105

START

Check TP1/2 Signal exist?

NO

Replace U1002

YES

Check TP3/4 Signal exist?

NO

Check

Component

above RF signal

path

YES

Check Transceiver

physical damage

or soldering condition

Replace U1500

NOT GOOD

OK?

Check next step

3.5 GSM RF PART

3.5.3 Checking RF Signal RX path(GSM850/900)

Checking Flow Image

TP2

TP1

Circuit Diagram

TP4

TP3

TP4

22

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3. TROUBLE SHOOTING

3.5 GSM RF PART

3.5.4 Checking RF Signal RX path(SW, GSM1800/1900)

Checking Flow

START

Check TP1 Signal exist?

YES

Check TP2 Signal exist?

YES

Check

SW1100

NO

Soldering

NO

Check U1001

Soldering

Check next step

TP1

Image

Main

Top

U1001

TP2

TP1

Circuit Diagram

TP2

23

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

TP1

TP4

TP2

TP4

TP3

TP1

START

Check TP1/2 Signal exist?

NO

Replace U1002

YES

Check TP3/4 Signal exist?

NO

Check Component

above RF signal

path

YES

Check Transceiver

physical damage

or soldering condition

Replace U1500

NOT GOOD

OK?

Check next step

3.5 GSM RF PART

3.5.5 Checking RF Signal RX path(GSM1800/1900)

Checking Flow

Image

TP2

Circuit Diagram

TP3

24

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

Main

BOT

SW1001

SW1002

1. GSM850 TX PATH

2. GSM900 TX PATH

3. GSM1800 TX PATH

4. GSM1900 TX PATH

3.5 GSM RF PART

3.5.6 GSM RF Part TX RF PATH

25

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3. TROUBLE SHOOTING

START

Check TP1

+VPWR OK?

NO

The Problem may be

Other part

Check Logic part

YES

Check TP2

1.5V≤TP2≤ 2V?

NO

Check DC-DC Power

Block

Refer to 1.8V

YES

Check Next step

TP1

TP2

Main

Top

TP2

TP1

3.5 GSM RF PART

3.5.7 Checking GSM PAM DC Power Circuit

Checking Flow

Circuit Diagram

Image

26

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

U1001

TP2

Main

Top

TP2

START

Check TP1 Signal exist?

Check

U1001

NO

Soldering

YES

Check TP2 Signal exist?

Check

U1002

NO

Soldering

YES

Check next step

TP2

TP1

3.5 GSM RF PART

3.5.8 Checking RF Signal TX path(SW, GSM850/900)

Checking Flow

TP1

Image

Circuit Diagram

TP1

27

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3. TROUBLE SHOOTING

TP2

TP1

Main

Top

U1100

TP2

TP1

START

NO

Check TP1/2

If GSM850/900 Over 9dBm?

Replace U1100

YES

NO

Check Transceiver

physical damage

or soldering condition

Replace U1500

NOT GOOD

OK?

Check next step

TP2

TP1

3.5 GSM RF PART

3.5.9 Checking RF Signal TX path(GSM850/900)

Checking Flow

Image

Circuit Diagram

28

reserved. Only training and service purposes

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3. TROUBLE SHOOTING

3.5 GSM RF PART

3.5.10 Checking RF Signal TX path(GSM1800/1900)

Checking Flow Image

If GSM1800/1900 Over

START

NO

Check TP1/2

9dBm?

NO

YES

Replace U1100

Check Transceiver

physical damage

or soldering condition

OK?

Check next step

NOT GOOD

Replace U1500

Main

Top

TP2

TP1

U1100

TP1

Circuit Diagram

TP1

TP2

29

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3. TROUBLE SHOOTING

3.6 WCDMA RF PART

WCDMA RF Part support WCDMA B1/2/5/8 with ASM, PAM, Transceiver component

Checking Flow

START

Check XO Block

Refer 3.1

Check Transceiver DC Power supply Block

Refer 3.2

Check DC-DC Block

Refer 3.3

Check ASM Block

Refer 3.4

Check T/RX Block

Re-Download & Cal

Change the Board

30

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3. TROUBLE SHOOTING

Main

Top

Main

BOT

SW1001

SW1002

1. WCDMA B5 RX PATH

2. WCDMA B8 RX PATH

3. WCDMA B1 RX PATH

4. WCDMA B2 RX PATH

3.6 WCDMA RF PART

3.6.1 WCDMA RF Part RX RF PATH

Image

LG A290 SERVICE MANUAL

Specifications and Main Features

Frequently Asked Questions

User Manual