LG 736P service manual

MOBILE PHONE

1

SERVICE MANUAL

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

MODEL : LG-736P

Internal Use Only

Date: July, 2015 / Issue 1.0

Table Of Contents

2

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

1.1 Purpose

1.2 Regulatory Information

2. PERFORMANCE..................................................... 4

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..........................................12

3.1 XO Block

3.2 Transceiver DC Power Supply Circuit

3.3 DC-DC Block

3.4 ASM Block

3.5 GSM Part

3.6 WCDMA Part

3.7 LTE Part

3.8 BT/WiFi Part

3.9 GPS Part

3.10 NFC

3.11 Power

3.12 USB

3.13 Hall IC

3.14 Sensor

3.15 Display

3.16 Main Camera

3.17 Front Camera

3.18 Motor

3.19 Audio

3.20 FM Radio Part

4. BLOCK DIAGRAM…........................................... 62

5. CIRCUIT DIAGRAM............................................ 72

LGE Internal Use Only

6. BGA PIN MAP.............................................................. 98

7. PCB LAYOUT…............................................................. 99

8. HIDDEN MENU........................................................... 107

9. DOWNLOAD…............................................................ 110

10. CALIBRATION........................................................... 111

11. DISASSEMBLE GUIDE............................................. 112

12. EXPLODED VIEW………………………………………... 113

13. REPLACEMENT PART LIST..…………………………. 114

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 Assem

• 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-stat

• 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

bly to repair product, be careful of a product failure caused by RF signals and Static electricity.

.

ic mat which is also grounded.

reserved. Only training and service purposes

2.1 Band Specification

4

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

EGSM 880 – 915 925 – 960

GSM850 824 – 849 869 – 894

DCS1800 1710 – 1785 1805 – 1880

PCS1900 1850 – 1910 1930 – 1990

WCDMA(FDD1) 1920 – 1980 2110 – 2170

WCDMA(FDD2) 1850 – 1910 1930 – 1988

WCDMA(FDD5) 824 – 849 869 – 894

WCDMA(FDD8) 880 – 915 925 – 960

LTE Band2 1850 – 1910 1930 – 1990

LTE Band3 1710 – 1785 1805 – 1880

2. PERFORMANCE

LTE Band4 1710 – 1755 2110 – 2155

LTE Band7 2500 – 2570 2620 – 2690

LTE Band17 704 – 716 734 – 746

LTE Band28 703 – 748 758 – 803

LGE Internal Use Only

reserved. Only training and service purposes

2.2 HW Features

5

List Type / Spec.

1. Phone Type DOP Type

2. Size 142.7 x 72.6 x 9.85 (mm)

3. Weight 140g (with Battery)

4. Battery 2,210mAh(min.) (Li-Ion)

5.Chipset MSM8939 1.5GHz Octa core

6. Memory 8GB(eMMC) + 1.5GB(LPDDR3) External Memory(SD Card) : Up to 32GB

7. LCD Size 5.2 inch

Display Type TFT

Color 16.7M colors

2. PERFORMANCE

8. Touch Typ e Incell, Capacitive type

9. Main Camera (13M) Typ e CMOS image sensor

LGE Internal Use Only

Resolution 1920(H) X 1080(V), 423ppi

Resolution 4208(H) x 3120(V) pixels

Image Scaling Down 4160x3120(4:3), 4160x2340(16:9), 3120x3120(1:1)

Format Image : JPG, Video : MP4

reserved. Only training and service purposes

2.2 HW Features

6

2. PERFORMANCE

10. Audio

11. Bluetooth Standard Bluetooth 4.1

12. WLAN Standard IEEE 802.11 b/g/n

13. GPS/GNSS type A-GPS/GNSS

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

Receiver 12 X 06 X 2.5T Receiver

Speaker 15 X 11 X 3.5T Speaker

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

Effective Distance 10M

Distance 0 m ~ 10 m (depend on environment)

Throughput Max 40Mbps

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

LGE Internal Use Only

reserved. Only training and service purposes

2.3 RSSI Display

7

2. PERFORMANCE

2.4 Current consumption

RSSI BAR GSM WCDMA LTE Comment

BAR 5->4 - 90dBm± 3dB - 86dBm± 3dB -84dBm ± 4dB

BAR 4->3 - 96dBm± 3dB - 92dBm± 3dB -94dBm ± 4dB

BAR 3->2 - 98dBm± 3dB - 98dBm± 3dB -104dBm ± 4dB

BAR 2->1 - 102dBm± 3dB - 102dBm± 3dB -114dBm ± 4dB

BAR 1->0 - 104dBm± 3dB - 108dBm± 3dB -127dBm ± 4dB

1. Sleep Mode Under 6.5mA

2. Sleep : connector Ear jack Under 7.5mA Under 7.5mA Under 8.5mA

Item

GSM

Specification

WCDMA

Under 6.5mA

1. Call Connected & CPIPH Level=-3.3

2. LTE: RSRP

LTE

Under 7.5mA

3. Current(Sleep & Idle AVG) Under 8.5mA @ P.P 5 Under 8.5mA @ DRX 7 Under 9.5mA @ 2.56s

LGE Internal Use Only

reserved. Only training and service purposes

2.5 Battery bar

Over

98

93

88

83

78

73

68

63

58

53

48 43%

38%

33%

28%

23%

16%

13%

8%

3%

2

15% , 5%, 1%

8

Battery Bar Specification

BAR 20 (Full)

BAR 20 --> 19

BAR 19 --> 18

BAR 18 --> 17

BAR 17 --> 16

BAR 16 --> 15

BAR 15 --> 14

BAR 14 --> 13

BAR 13 --> 12

BAR 12 --> 11

2. PERFORMANCE

98%

% -> 97%

% -> 92%

% -> 87%

% -> 82%

% -> 77%

% -> 72%

% -> 67%

% -> 62%

% -> 57%

BAR 11 --> 10

BAR 10 --> 9

BAR 9 --> 8

BAR 8 --> 7

BAR 7 --> 6

BAR 6 --> 5

BAR 5 --> 4

BAR 4 --> 3

BAR 3 --> 2

BAR 2 --> 1

BAR 1 --> 0

Power off

Low battery pop-up

LGE Internal Use Only

% -> 52%

% -> 47%

-> 42%

-> 37%

-> 32%

-> 27%

-> 22%

-> 15%

-> 12%

-> 7%

-> 2%

% -> 1%

remain%

reserved. Only training and service purposes

2.6 SW Specification

9

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 Ye s depending on build language

Quick Access Mode Phone / Messaging / Browser/ Appli

PC Sync Yes LG Bridge is supported.

Speed Dial Yes Voice mail center -> 1 key

Profile Ye s not same with feature phone s

CLIP / CLIR Ye s

Phone Book Name / Number / Email / Groups /

Last Dial Number Ye s

Last Received Number Yes

Last Missed Number Yes

Search by Number/Na

me

Group Yes There is no limitation on the n

Fixed Dial Number Yes

Service Dial Number No

Own Number

cations

Postal addresses / Organizations / I

M / Note / Nickname / Website / Ev

ent /

Yes

Yes My Pr

2. PERFORMANCE

Phone / Contact / Applications

/ Browser / Messaging

It has two functions which are

Software Upgrade and LG Back

up.

etting

There is no limitation on the n

umber of items.

It depends on available memor

y amount.

umber of items.

It depends on available memor

y amount.

ofile (add/edit/delete are

supported)

LGE Internal Use Only

reserved. Only training and service purposes

2.6 SW Specification

10

Voice Memo Ye s Support voice recorder

Call Reminder

Network Selection Automatic

Mute Yes

Call Divert Ye s Call forwarding

Call Barring Ye s

Call Charge (AoC) No

Call Duration Yes

SMS (EMS) There is no limitation on the number of items

SMS Over GPRS Ye s

EMS Melody / Picture

Send / Receive / Save

MMS MPEG4

Send / Receive / Save

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

Download

Game No

Calendar Ye s

Memo Yes

World Clock Yes

Yes

.

It depends on available memory amount.

No

Yes

2. PERFORMANCE

If it means “Missed call notify”, it is su

pported

EMS does not support.

 Send / Receive : Ye s  Sav

1. video/mp4

2. video/h263

3. video/3gpp2

There is no limitation on the number o

It depends on available memory amo

e : depends on content type

Support st

video content type li

video/3gpp

Web Download

f item

unt.

s.

LGE Internal Use Only

reserved. Only training and service purposes

2.6 SW Specification

11

Unit Convert No

Stop Watch Yes

Wall Paper Yes

WAP Browser No WAP stack and wml are not

Download Melody /

Wallpaper

SIM Lock No

SIM Toolkit Yes

MMS Yes Google MMS Client

EONS Yes

CPHS Ye s V4.2

ENS No

Camera Yes 13M AF /

JAVA No

Voice Dial No US English only

IrDa No IrRC

Bluetooth Ye s Ver. 4.1

FM radio Yes

GPRS Yes Class 33 EDGE Yes Class 33

Hold / Retrieve Ye s

Conference Call Yes Max. 6

Ye s

DTMF

Memo pad No

TTY No

AMR Yes

SyncML No

IM Yes Google Hangout

Email Yes

2. PERFORMANCE

supported.

Yes Over web browser

Digital Zoom : x4

LGE Internal Use Only

reserved. Only training and service purposes

3. TROUBLE SHOOTING

12

3.1 XO Block

The output frequency(19.2MHz) of XO(X4100) is used as the reference one of WTR4905 and PM8916 internal VCO

Image Checking Flow

START

Check TP1

Is it 19.2MHz?

NO

Replace X4100 and then

check TP1

Is it 19.2MHz?

NO

The Problem may be

Logic part

Refer to

Logic trouble shoot

YES

XO Circuit is OK.

Check next step

XO Circuit is OK.

Check next step

TP1

TOP

U1500

Circuit Diagram

TP1

LGE Internal Use Only

reserved. Only training and service purposes

3.2 Transceiver DC Power Supply Circuit

13

Checking Transceiver DC Power Supply Circuit

3. TROUBLE SHOOTING

Image Checking Flow

START

Check TP1

+1V225_RF is OK?

YES

Check TP2

+2V05_RF is OK?

YES

Check next step

NO

The Problem may be

Logic part

Refer to Logic trouble

shoot

The Problem may be

Logic part

Refer to Logic trouble

shoot

TP2

(2.05V)

TP2(2.05V)

U1500

TP1

(1.225V)

Circuit Diagram

TP1(1.225V)

TOP

LGE Internal Use Only

reserved. Only training and service purposes

3.3 DC-DC Block

14

Checking DC-DC Block

3. TROUBLE SHOOTING

Image Checking Flow

START

Check TP1(+VPA0)

0.5V ≤ TP1 ≤ 3.6V ?

YES

Check next step

NO

Check U1400 Physical

Damage or soldering

condition

U1400

TP1

(+VPA0)

Circuit Diagram

BOTTOM

TP1

(+VPA0)

LGE Internal Use Only

reserved. Only training and service purposes

3.4 ASM Block

15

Checking FEMiD Block

3. TROUBLE SHOOTING

Image Checking Flow

START

Check TP1, TP2 High Level?

(2.5V≤TP1 ≤3.1V) (1.7V≤TP2 ≤1.9V)

YES

Check U1400 physical Damage

or soldering condition

OK?

Check Next step

NO

NOT GOOD

The Problem may be

Logic part

Refer to Logic trouble

shoot

Replace U1200

TP1(2.85V)

TOP

U1200

TP2(1.8V)

Circuit Diagram

LGE Internal Use Only

TP2(1.8V)

reserved. Only training and service purposes

3.5.1 GSM Part

16

GSM850/900/1800/1900 Rx

3. TROUBLE SHOOTING

Image Checking Flow

START

Check TP1/2/3 Signal exist?

YES

Check Transceiver physical

damage

or soldering condition

OK?

Check next step

above RF signal path

NO

NOT GOOD

Check Component

Replace U1500

TOP

U1500

TP3 (DCS/PCS Rx)

TP1(G900 Rx)

TP2(G850 Rx)

LGE Internal Use Only

reserved. Only training and service purposes

3.5.1 GSM Part

17

3. TROUBLE SHOOTING

Circuit Diagram

TP2(G850 Rx)

TP1(G900 Rx)

LGE Internal Use Only

TP3 (DCS/PCS Rx)

reserved. Only training and service purposes

3.5.2 GSM Part

18

GSM850/900/1800/1900 Tx

Checking Flow Image

3. TROUBLE SHOOTING

START

Check TP1

+VPWR OK?

YES

Check TP2

2.5V≤TP2≤5.5V?

YES

Check TP3/4

If GSM850/900 Over 31dBm?

If DCS/PCS Over 28dBm?

NO

Check TP5/6

If GSM850/900 Over 9dBm?

If DCS/PCS Over 7dBm?

NO

Check Transceiver

physical damage

or soldering condition

OK?

NO

YES

NOT GOOD

The Problem may be Other part

Check Logic part

Check DC-DC Power Block

Refer to 3.3

Check component

above RF signal path

Check U1300 soldering

Replace U1500

TOP

TP6(DCS/PCS)

TP2(+VPA0)

U1300

TP1(+VPWR)

TP4

TP3

Check next step

LGE Internal Use Only

TP5(G900/G850)

reserved. Only training and service purposes

3.5.3 GSM Part

19

3. TROUBLE SHOOTING

TP2(+VPA0)

TP1(+VPWR)

Circuit Diagram

TP6(DCS/PCS)

TP5(G900/G850)

LGE Internal Use Only

TP3

TP4

3.5.2 GSM PART

reserved. Only training and service purposes

3.6.1 WCDMA Part

20

Checking Rx signal path(B1/B2/B5/B8)

Checking Flow Image

START

3. TROUBLE SHOOTING

TP1

TOP

Check TP1/2/3/4

Check Transceiver

physical damage

or soldering condition

Check next step

LGE Internal Use Only

Signal exist?

YES

OK?

NO

Check U1200

Replace U1500

U1500

U1200

TP2

TP4

TP3

reserved. Only training and service purposes

3.6.1 WCDMA Part

21

3. TROUBLE SHOOTING

Circuit Diagram

TP1

TP3

LGE Internal Use Only

TP4

TP2

reserved. Only training and service purposes

3.6.2 WCDMA Part

22

Checking DRX RF signal path (B1/2/5/8)

3. TROUBLE SHOOTING

Check TP1/TP3/

TP5/TP7/TP9 Signal exist?

Check TP6/TP8

Check Transceiver

physical damage

or soldering condition

Check next step

LGE Internal Use Only

START

YES

Check TP2

Signal exist?

YES

Check TP4

Signal exist?

YES

Signal exist?

YES

Check TP10

Signal exist?

YES

OK?

Checking Flow

NO

NOT GOOD

Check

SW1101,U1103

Soldering

Check B1 FL1109

Soldering

Check B2 FL1110

Soldering

Check B5 FL1107,

FL1108 Soldering

Check B8 FL1106

Soldering

Replace U1500

TP3

TOP

TP4

U1103

TP2

TP8

TP7

TP1

TP9

Image

TOP

U1500

TP6

TP5

TP10

SW1101

BOTTOM

reserved. Only training and service purposes

3.6.2 WCDMA Part

23

3. TROUBLE SHOOTING

Circuit Diagram

TP1

TP3

WCDMA Band1

TP2

TP4

15

TP7

TP5

WCDMA Band5

TP6

TP8

LGE Internal Use Only

WCDMA Band2

TP9

WCDMA Band8

TP10

reserved. Only training and service purposes

3.6.3 WCDMA Part

24

Checking Tx signal path (B1/B2/B5/B8 Tx)

Checking Flow Image

3. TROUBLE SHOOTING

START

Check TP1/2/3/4

Signal is over 23dBm?

NO

Check TP5/6

Signal is over 3.5dBm

NO

Check Transceiver

physical damage

or soldering condition

OK?

Check next step

Check component

YES

NOT GOOD

above RF signal

Replace U1500

path

Check U1300

Soldering

TP2

TP1

TP5

TP3

TP6

TOP

TP4

U1300

LGE Internal Use Only

reserved. Only training and service purposes

3.6.3 WCDMA Part

25

3. TROUBLE SHOOTING

Circuit Diagram

TP1

TP5

TP2

TP3

LGE Internal Use Only

TP6

TP4

reserved. Only training and service purposes

3.7.1 LTE Part

26

Checking PRx signal path(Band2/3/4/7/17/28 PRX)

START

3. TROUBLE SHOOTING

Image Checking Flow

Check Transceiver physical

or soldering condition

Check next step

LGE Internal Use Only

Check TP

Signal exist?

damage

1/2/3/4

YES

OK?

above RF signal path

NO

NOT GOOD

Check Component

Replace U1500

TP2(Band4 Rx)

U1500

TP1(Band2/3 Rx)

TP3(Band7 Rx)

TP4(Band17/28 Rx)

TOP

reserved. Only training and service purposes

3.7.1 LTE Part

27

3. TROUBLE SHOOTING

Circuit Diagram

TP1

TP3

TP2

TP4

LGE Internal Use Only

reserved. Only training and service purposes

3.7.2 LTE Part

28

Checking DRx signal path(Band2/3/4/7/17/28 DRX)

3. TROUBLE SHOOTING

START

Check TP1/2/3/4

ignal exist?

S

YES

Check Transceiver physical

damage

or soldering condition

OK?

above RF signal path

NO

NOT GOOD

Check Component

Replace U1500

TOP

TP1 (Band2/3 DRX )

TP2 (Band4 DRX )

Image Checking Flow

TOP

U1500

TP4 (Band17/28 DRX )

Check next step

LGE Internal Use Only

TP3 (Band7 DRX)

BOTTOM

reserved. Only training and service purposes

3.7.2 LTE Part

29

3. TROUBLE SHOOTING

Circuit Diagram

TP3

TP1

LGE Internal Use Only

TP2

TP4

reserved. Only training and service purposes

3.7.3 LTE Part

30

LTE2/3/4/17/28A/28B Tx

Checking Flow Image

START

Check TP1 /TP3

+VPA0 OK?

YES

Check TP2/TP13

3.2V≤TP2≤4.2V?

YES

The Problem may be Other part

NO

Check SKY87006 Logic part

The Problem may be Other part

Check SKY87006 Logic part

U1400

3. TROUBLE SHOOTING

TP1

(+VPA0)

TP2

(+VPWR)

BOTTOM

Check TP4/5/6/7/8/9/10/11/12

If LTE of All band Over 22dBm?

Check TP4/5/6/7/8/9/10/11/12

If LTE of All band Over 10dBm?

Check Transceiver

physical damage

or soldering condition

Check next step

LGE Internal Use Only

NO

OK?

YES

NOT GOOD

Check component

above RF signal path

Replace U1300

Replace U1500

TP4(Band2 Tx)

TP12(Band2/3/4 Tx)

TP8(Band17 Tx)

TP6(Band4 Tx)

TP5(Band3 Tx)

U1300

TP3(+VPA0)

TP9(Band28 Tx)

TP13(+VPWR)

TP11(Band17/28 Tx)

reserved. Only training and service purposes

TP10(Band28B TX)

FL1201

TOP

TP7(Band17 Tx)

LG 736P service manual

Specifications and Main Features

Frequently Asked Questions

User Manual