LG X155 schematic

MOBILE PHONE

SERVICE MANUAL

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

MODEL : LG-X155

Internal Use Only

Date: Nov. 2015 / Issue 1.0

Table Of Contents

2

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

1.1 Purpose

1.2 Regulatory Information

2. PERFORMANCE................... 3

2.1 Band Specification

2.2 HW Features

2.3 RSSI Display

2.4 Current consumption

2.5 Battery bar

2.6 SW Specification

3. TROUBLE SHOOTING.............4

3.1 Checking XO Block

3.2 Checking Transceiver DC Power Supply Circuit Block

3.3 FEM (Front-End Module) Block

3.4 GSM RF PART

3.5 WCDMA RF Part

3.6 Connectivity PART

3.7 Power

3.8 charger

3.9 Checking Audio Block

3.10 Checking LCD Block

3.11 Checking Touch Block

3.12 Checking sensor Block

3.13 Checking USB Block

3.14 Checking camera Block

6. BGA PIN MAP.................... 79

7. PCB LAYOUT…................... 80

8. HIDDEN MENU.................... 88

9. DOWNLOAD…..................... 91

10. CALIBRATION................... 92

11. DISASSEMBLE GUIDE.............. 93

12. EXPLODED VIEW.................. 95

13. REPLACEMENT PART LIST.......... 96

4. BLOCK DIAGRAM…............ 69

5. CIRCUIT DIAGRAM........... 78

LGE Internal Use Only

reserved. Only training and service purposes

1. INTRODUCTION

3

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.

LGE Internal Use Only

reserved. Only training and service purposes

2.1 Band Specification

4

Support Band TX Freq (MHz) RX Freq (MHz)

WCDMA(FDD1) 1920 – 1980 2110 – 2170

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

2. PERFORMANCE

LGE Internal Use Only

2.2 HW Features

5

List Type / Spec.

1. Phone Type BAR Type

2. Size 140.8x71.6.x9.6mm

3. Weight 157.5g(with battery)

4. Battery 2540mAh (Li-Ion)

5.Chipset MT6582V/W

6. Memory 8GB eMMc+1GB LPDDR3, External Memory(SD Card) : Up to 32GB

7. LCD Size 5.0 inch

2. PERFORMANCE

Dot 480RGB X 854

Color 16.7M colors

Display Type TFT/TRANSMISSIVE

NTSC Typ 50%

Contrast Ratio Typ. 350:1

Pixel Pitch 0.1293(W) *0.1293(L)

8. Main Camera (5M) Type CMOS, Samsung LSI S5K5E2YA03-FGX2 5M sensor

LGE Internal Use Only

Color temperature 6000 ~ 8000(K) ( typ. 7000K)

Resolution 2,560 x 1,920 pixels.

Frame Rate Capture – 4:3 30fps

FHD Video – 16:9 60fps

View Angle 64.8(D), 53.9(H), 41.7(V)

Image Scaling Down VGA(640*480)

Pixel x size 1.12um x 1.12um

Format 1/5” optical format, MIPI RAW10 output format

2.2 HW Features

6

2. PERFORMANCE

10. Audio

11. Bluetooth Standard Bluetooth 4.0

12. WLAN Standard IEEE 802.11 b/g/n

13. GPS type A-GPS

14. FM type FM Radio, 3.5pi Ear-jack

Receiver 15 X 06 X 2.2T Receiver

Speaker 18 X 10 X 3.1T Speaker

Format MP3, AAC, MIDI, EAAC+, OGG, AMR

Effective Distance 10M

Distance 0 m ~ 10 m (depend on environment)

Throughput Max 40Mbps (SDIO Driver performance)

Depend on environment 0 ~ 50m (depend on environment)

LGE Internal Use Only

2.3 RSSI Display

7

2. PERFORMANCE

LGE Internal Use Only

2.4 Current consumption

8

2. PERFORMANCE

Item

Specification

WCDMA GSM

1. Sleep Mode Under 6.0mA,@ BAT4V,DRX7 Under 6mA@ P.P 5

2. Sleep : connector Ear jack Under 6.0mA,@ BAT4V,DRX7 Under 6mA@ P.P 5

3. Current(Sleep & Idle AVG) Under 6.0mA,@ BAT4V,DRX7 Under 6mA @ P.P 5

4. BT Connected idle Under 7.5mA Under 7.5mA

1) GSM900/GSM850

5. Talk Mode

≤260mA @10dBm ≤270mA @12dBm

≤340mA@PCL5

2) DCS1800/PCS1900

≤280mA@PCL0

6. No service N/A NA

7. Power Off Mode Under 200 uA Under 200 uA

8. Backup Battery N/A N/A

LGE Internal Use Only

2.5 Battery bar

Blue

Orange

Power

9

2. PERFORMANCE

7 100%-91%

6 90%-76%

5 75%-61%

4 60%-50%

3 49%-36%

2 35%-16%

1 15%-5%

0 4%-0%

bar

Low battery warning 15%

Forced shutdown 3.4± 0.05 V

LGE Internal Use Only

OFF

2.6 SW Specification

10

Item Feature Comment RSSI 0 ~ 5 Levels Yes

Battery Charging 0 ~ 20 Levels Pecentage displying

Key Volume 0 ~ 7 Level Not adjustable

Audio Volume 0 ~ 15 Level Yes

Time / Date Display Yes Yes

Multi-Language Yes depending on build language

Quick Access Mode

PC Sync No No

Speed Dial Yes Voice mail center -> Long press 1 key

Profile Yes not same with feature phone setting

CLIP / CLIR Yes Yes

Phone / Messaging / Browser/

Applications

Phone / Contact / Applications/ Bowser/ Messaging

2. PERFORMANCE

Phone Book

Last Dial Number Yes Yes

Last Received Number Yes Yes

Last Missed Number Yes Yes

Search by Number/Name Yes Yes

Group Yes

Fixed Dial Number Yes Yes

Service Dial Number Yes Depend on SIM

Own Number Yes My Profile (add/edit/delete are supported)

LGE Internal Use Only

Name / Number / Email / Groups /

Postal addresses / Organizations / IM /

Note / Nickname / Website / Event /

There is no limitation on the number of items.

It depends on available memory amount.

There is no limitation on the number of items.

It depends on available memory amount.

2.6 SW Specification

11

Voice Memo Yes Support voice recorder

Call Reminder No No

Network Selection Automatic Yes

Mute Yes Yes

Call Divert Yes Yes

Call Barring Yes Dependong operator

Call Charge (AoC) No No

Call Duration Yes Yes

SMS (EMS) There is no limitation on the numbe

SMS Over GPRS Yes Yes

EMS Melody / Picture

Send / Receive / Save

MMS MPEG4

Send / Receive / Save

2. PERFORMANCE

No

r of items.

It depends on available memory am

ount.

No No

Yes  Send / Receive : Yes

 Save : depends on content typeSupport

video content type list

1. video/mp4

2. video/h263

3. video/3gpp2 video/3gpp

LGE Internal Use Only

Long Message MAX 2000 characters The standard of Open vender Cell Broadcast Yes Yes

Download Over the Web Yes

Game No depend on CA preloading

Calendar Yes Yes

Memo Yes There is no limitation on the number of items.

It depends on available memory amount.

World Clock Yes Yes

2.6 SW Specification

12

Unit Convert No No

Stop Watch Yes Yes

Wall Paper Yes Yes

WAP Browser No Support only web browser based on

Download Melody / Yes Over web browser

Wallpaper

SIM Lock No depend on operator

SIM Toolkit Yes Yes

MMS Yes Google MMS Client

EONS Yes Yes

CPHS Yes V4.2

ENS No No

Camera Yes 5M AF /

JAVA No

Voice Dial No US English only

IrDa No No

Bluetooth Yes Ver. 4.0

FM radio Yes Yes

GPRS Yes Class 12 EDGE Yes Class 12(Rx only)

Hold / Retrieve Yes Yes

Conference Call Yes Max. 6

DTMF Yes Yes

Memo pad No No

TTY No No

AMR Yes Yes

SyncML No No

IM Yes Google Hangout

Email Yes Yes

2. PERFORMANCE

webkit. WAP stack and wml are not

supported.

Digital Zoom : x4

LGE Internal Use Only

3. TROUBLE SHOOTING

13

3.1 Checking XO Block

The out put frequency(26.0MHz) of XO(X701) is used as the reference one of MT6166V and MT6582V/W internal VCO

Image

Checking Flow

Main

START

Top

Check TP1

Is it 26.0 MHz?

Replace X701 and then

check TP1

Is it 26.0 MHz?

The Problem may be Logic part

Refer to Logic trouble shoot

LGE Internal Use Only

NO

YES

XO Circuit is OK.

Check next step

XO Circuit is OK.

Check next step

X4100

TP1

Circuit Diagram

TP1 (X701)

reserved. Only training and service purposes

3.2 Checking Transceiver DC Power Supply Circuit Block

14

The MT6166V operating voltages used three voltage sources 1.8V and 1.8V and 2.8V

3. Troubleshooting

START

Check TP1

+1.8V is OK?

YES

Check TP2

+1.8V is OK?

YES

Check TP3

+2.8V is OK?

Checking Flow

NO

Refer to Logic trouble shoot

NO

Refer to Logic trouble shoot

NO

Refer to Logic trouble shoot

The Problem may be Logic

part

The Problem may be Logic

part

The Problem may be Logic

part

TP1(1.8V)(R713)

TP2(1.8V)(R711)

Main

Top

Image

U701

Circuit Diagram

TP1 TP2

TP3

Check next step

LGE Internal Use Only

TP3(2.8V)(B701)

reserved. Only training and service purposes

3.3 FEM (Front-End Module) Block

15

3.3.1 . FEM Mode Control Logic Table

3. Troubleshooting

FEM Mode Control Logic Table

LGE Internal Use Only

reserved. Only training and service purposes

3.3 FEM (Front-End Module) Block

16

3.3.2 . All Band FEM Block (GSM 850/900/1800/1900, WCDMA B1/5)

Checking Flow

3. Troubleshooting

Image

START

Check TP1~4 level with FEM Mode Control Logic

Table?

YES

Check Next step

The Problem may be Logic

Refer to Logic trouble shoot

NO

part

Main

U901

Bot

Circuit Diagram

TP3(0V or 2.85V)

TP4(0V or 2.85V)

TP2(0V or 2.85V) TP1(0V or 2.85V)

TP1(0V or 2.85V)C901

TP2(0V or 2.85V)C902

TP3(0V or 2.85V)C903

LGE Internal Use Only

TP4(0V or 2.85V)C904

reserved. Only training and service purposes

3.4 GSM RF PART

17

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

Checking Flow

START

Check XO Block

Refer 3.1

3. Troubleshooting

LGE Internal Use Only

Check Transceiver DC Power supply Block

Refer 3.2

Check FEM Block

Refer 3.3

Check T/RX Block

Re-Download & Cal

Change the Board

reserved. Only training and service purposes

3.4 GSM RF PART

18

3.4.1 GSM850/900/1800/1900 Rx

Main

Top

U701

Main

Bot

3. Troubleshooting

Image

1.GSM850/GSM900 RX PATH

2.DCS1800/PCS1900 RX PATH

3.DCS1800/PCS1900 TX PATH

4.GSM850/GSM900 TX PATH

5.COMMON T/RX PATH

LGE Internal Use Only

Main

Bot

U901

J901

reserved. Only training and service purposes

3.4 GSM RF PART

19

3. Troubleshooting

3.4.1.1 Checking RF signal path (SW)

Checking Flow

START

Check

TP1

Signal exist?

YES

Check next step

NO

Check

J901

Soldering

Image

Main

Bot

TP1(J901)

J901

Circuit Diagram

LGE Internal Use Only

TP1

reserved. Only training and service purposes

3.4 GSM RF PART

20

3.4.1.2 Checking RF Signal RX path(GSM850/GSM900/DCS1800/PCS1900)

Checking Flow Image

START

Check

Check TP1/2 Signal exist?

NO

YES

Component

above RF signal

path

TP1 TP2

Main

Top

3. Troubleshooting

U701

Check Transceiver

physical damage

or soldering condition

Check next step

LGE Internal Use Only

OK?

NOT GOOD

Replace U701

Circuit Diagram

TP1

TP2

reserved. Only training and service purposes

3.4 GSM RF PART

21

3.4.2.1 GSM850/900/1800/1900 Tx

Main

Top

U701

Main

Bot

3. Troubleshooting

Image

1.GSM850/GSM900 RX PATH

2.DCS1800/PCS1900 RX PATH

3.DCS1800/PCS1900 TX PATH

4.GSM850/GSM900 TX PATH

5.COMMON T/RX PATH

LGE Internal Use Only

Main

Bot

U901

J901

reserved. Only training and service purposes

3.4 GSM RF PART

22

3.4.2.2 Checking GSM PAM DC Power Circuit

Checking Flow

START

3. Troubleshooting

Image

TP1

U901

Check TP1 Supply voltage OK?

Check FEM control logic OK?

Refer to 3.3 FEM Block.

LGE Internal Use Only

YES

Check TP2

If Vramp ok?

YES

Check Next step

NO

The Problem may be

Other part

Check Logic part

The Problem may be

Logic part

TP2

Main

Bot

Circuit Diagram

TP2(0.1V~1.6V)R907

TP1(3.4V~4.3V)R912

reserved. Only training and service purposes

3.4 GSM RF PART

23

3.4.2.3 Checking RF signal path(SW)

Checking Flow

START

Check TP1

If DCS/PCS Over 30dBm?

If 850/900 Over 33dBm?

NO

Check next step

YES

Check J901 Soldering

3. Troubleshooting

Image

TP1(J901)

J901

Circuit Diagram

LGE Internal Use Only

TP1

reserved. Only training and service purposes

3.4 GSM RF PART

24

3.4.2.4 Checking RF signal path

Checking Flow

3. Troubleshooting

Image

START

Check TP1

If GSM850/900 Over 32.5dBm?

If DCS/PCS Over 29.5dBm?

NO

Check TP2/3

If power at 0~6dBm?

NO

Check Transceiver physical

damage

or soldering condition

OK?

YES

NOT GOOD

Check component

above RF signal path

Check U901 soldering

Replace U701

TP2

Main

Bot

TP1

TP3

U901

J901

Main

Bot

Circuit Diagram

TP2

Check next step

LGE Internal Use Only

TP1

TP3

reserved. Only training and service purposes

3.5 WCDMA RF Part

25

WCDMA RF Part support WCDMA B1/B8 with FEM, PAM, Transceiver component

Checking Flow

START

Check XO Block

Refer 3.1

3. Troubleshooting

LGE Internal Use Only

Check Transceiver DC Power supply Block

Refer 3.2

Check FEM Block

Refer 3.3

Check T/RX Block

Re-Download & Cal

Change the Board

reserved. Only training and service purposes

3.5 WCDMA RF PART

26

3.5.1 WCDMA RF Part RX PATH (B1/B8)

1) WCDMA RX Path

3. Troubleshooting

Image

Main

Top

U805

U808

U701

Main

Bot

U901

1.Band 1 RX PATH

2.Band 8 RX PATH

3.COMMON T/RX PATH

J901

Main

Bot

LGE Internal Use Only

reserved. Only training and service purposes

3.5 WCDMA RF PART

27

3.5.1.1 Checking RF signal path(Band 1)

3. Troubleshooting

ImageChecking Flow

START

Check TP1

Signal exist?

YES

Check TP2

Signal exist?

YES

Check TP3

Signal exist?

YES

Check Transceiver physical damage

or soldering condition

OK?

Check next step

NO

NOT GOOD

Check J901 Soldering

Check U901 Soldering

Check U808 Soldering

Replace U701

U809

U808

U701

Main

TP3

TP2

TP1

Top

Main

Bot

U901

Main

Bot

J901

LGE Internal Use Only

reserved. Only training and service purposes

3.5 WCDMA RF PART

28

3.5.1.1 Checking RF signal path(B1)

TP1

3. Troubleshooting

Circuit Diagram

TP1

LGE Internal Use Only

TP3

TP2

reserved. Only training and service purposes

3.5 WCDMA RF PART

29

3.5.1.2 Checking RF signal path(Band 8)

3. Troubleshooting

ImageChecking Flow

START

Check TP1

Signal exist?

YES

Check TP2

Signal exist?

YES

Check TP3

Signal exist?

YES

Check Transceiver physical damage

or soldering condition

OK?

Check next step

NO

NOT GOOD

Check J901 Soldering

Check U901 Soldering

Check U805 Soldering

Replace U701

U805

U808

U701

TP2

Main

Top

TP3

TP1

Main

Bot

U901

Main

Bot

J901

LGE Internal Use Only

reserved. Only training and service purposes

3.5 WCDMA RF PART

30

3.5.1.2 Checking RF signal path(Band 8)

TP3

3. Troubleshooting

Circuit Diagram

TP1

LGE Internal Use Only

TP2

reserved. Only training and service purposes

LG X155 schematic

Specifications and Main Features

Frequently Asked Questions

User Manual