LG D285F SERVICE MANUAL

Internal Use Only

Service Manual

LG-D285F

Date: Jun, 2014 / Issue 1.0

Table Of Contents

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

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

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

1.3 Specications .............................................................................................5

2. PERFORMANCE ...................................................................... 8

2.1 Product Name ............................................................................................8

2.2 Supporting Standard ..............................................................................8

2.3 Main Parts : GSM Solution .....................................................................8

2.4 HW Features ...............................................................................................9

2.5 HW SPEC ................................................................................................... 11

2.6 D285F Figures ......................................................................................... 24

3. TROUBLE SHOOTING ..........................................................25

3.1 WCDMA Rx Part ......................................................................................25

3.2 WCDMA Tx Part Trouble ...................................................................... 50

3.3 GSM Rx Part Troubleshooting ..........................................................82

3.4 GSM Tx Part Troubleshooting .........................................................118

3.5 Power .......................................................................................................127

3.6 Charging .................................................................................................131

3.7 USB TS ......................................................................................................133

3.8 Audio ........................................................................................................134

3.9 3 AXIS Sensor ........................................................................................148

3.10 Proximity Sensor ...............................................................................151

3.11 Touch Sensor Trouble Shooting ..................................................153

3.12 Vibrator Trouble Shooting .............................................................155

3.13 5M Main Camera TS .........................................................................157

3.14 Main LCD TS ........................................................................................160

3.15 BT/Wi TS .............................................................................................163

3.16 GPS TS ....................................................................................................166

3.17 FM TS ......................................................................................................169

4. DOWNLOAD .......................................................................171

5. BLOCK DIAGRAM ..............................................................188

6. CIRCUIT DIAGRAM ............................................................199

7. BGA PIN MAP .....................................................................220

8. PCB LAYOUT .......................................................................225

9. CALIBRATION .....................................................................229

10. HIDDEN MENU .................................................................248

11. DISASSEMBLE GUIDE ......................................................279

12. EXPLODED VIEW & REPLACEMENT PART LIST .............284

12.1 EXPLODED VIEW ................................................................................284

12.2 Replacement Parts ...........................................................................285

12.3 Accessory .............................................................................................311

LGE Internal Use Only

- 2 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

1. INTRODUCTION

1.1 Purpose

1. Introduction

This manual provides the information necessary to repair, calibration, description and download the features

C. Ch

Maintenance limitations on the phones must be performed only by the manufacturer or its authorized agent

y y y

of this model.

1. INTRODUCTION

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.

anges 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 phones or compatibility with the net work,
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 Limitation

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.

E. Notice of Radiated Emission

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.

LGE Internal Use Only

- 3 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

.

1. INTRODUCTION

1. Introduction

H. Electrostatic Sensitive Devices

information is ESD handling:

F. Pictures

The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.

G. Interference and Attenuation

A phone may interfere with sensitive laboratory equipment, medical equipment, etc. Interference from
unsuppressed engines or electric motors may cause problems.

ATTENTION

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

• 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.

LGE Internal Use Only

- 4 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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1.3 Specication

KEY FEATURES

• Android 4.4-(KitKat)

• 4.3” Touch Screen WVGA (480 x 800)

• 5MP AF with ash

• 3G Mobile Hotspot

ENHANCED USER EXPERIENCE

• Android 4.4

• Proximity Sensor – locks the touch screen and buttons while talking on the phone

1. INTRODUCTION

• Motion Sensor – Electronic compass , Accelerometer and Gyroscope

• USB Charging via Computer

• Airplane Mode (RF O)

DESIGN

• Sleek and Stylish Design

• 4.3“ WVGA LCD Screen

• Capacitive Touch Screen – Glass with fast and accurate response

• Micro USB/Charging Port

LGE Internal Use Only

- 5 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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CAMERA/VIDEO

• 5MP AF with ash and Camcorder

• Camera Resolutions : 2560x1920, 2240x1344, 1280x960 Pixels

• Image Editor: zoom, rotate, crop images

• Brightness, ISO, White Balance,* Color Eects, Timer

• Cheese shutter – take photo with voice command.

• Video Resolutions: 800x480, 640x480, 320x240, 176x144 Pixels

MULTIMEDIA

• Music Player for MP3, WMA, and Unprotected AAC

• Stereo Sound via Headset or Bluetooth

1. INTRODUCTION

• Music Library – Organized by Artists, Albums, Songs, and Playlists

• Repeat and Shue Music Playback Modes

BLUETOOTH®

• Version: 4.0

• Supported Proles: headset, hands-free, object push, advanced audio distribution (stereo), audio/video remote control,

le transfer, phone book access, message access, serial port

• Listen to Music with Optional Stereo Bluetooth Headset**

• Send User-Generated Pictures (JPEG) and Videos via Bluetooth Wireless Technology

*Depends on available memory.
**Accessories sold separately.

LGE Internal Use Only

- 6 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

1. INTRODUCTION

VOICE/AUDIO

• One-Touch Speakerphone*

• Speaker-Independent Voice Commands

• Voice-Activated Dialing

• Text to Speech

• MP3 Music Ringer Support

TOOLS & DATA

• Android Apps: Alarm/Clock, Browser, Calculator, Calendar (Corporate or Google), Camera, Contacts, Email, Gallery, Gmail,
Google+, Maps, Messaging, Messenger, Music Player, Phone, Places, Play Books, Play Movies, Play Music, Play Store, Talk,
Video Player, Voice Recorder, Youtube

• Navigation – spoken turn-by-turn directions showing real-time trac

• Wi-Fi Connectivity – IEEE 802.11 b/g/n

• A-GPS Support for Enhanced Location Accuracy

SPECIFICATIONS

• Technology: GSM/WCMDA

• Frequencies: GSM 850,900,1800,1900

WCDMA 2100, 850

• Data Transmission: WCMDA, GPRS

• Dimensions: 127.2 x 66.8 x 9.65(mm)

• Display: 4.3” , WVGA (480 x 800) pixels

• Standard Battery: 2,040 [mAh]

ACCESSORIES

• Standard Battery

• Travel Adapter and USB Cable*

• Stereo Headset

LGE Internal Use Only

- 7 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

2. PERFORMANCE

LG-D285 Product SPEC

2.1 Product Name

LG-D285: WCDMA 900//2100+GSM850/EGSM/DCS/PCS

(HSUPA 5.76Mbps(cat6)/HSDPA 21Mbps(cat14)/GPRS Class12/EDGE Class12)

2.2 Supporting Standard

Supporting Standard

WCDMA(FDD1,5)/EGSM/GSM850/DCS1800/PCS1900

with seamless handover

Phase 2+(include AMR)

SIM Toolkit : Class 1, 2, 3, C-E

Frequency Range

WCDMA(FDD1) TX : 1920 – 1980 MHz

WCDMA(FDD1) RX : 2110 – 2170 MHz

WCDMA(FDD8) TX : 880 – 915 MHz

WCDMA(FDD8) RX : 925 – 960 MHz

EGSM TX : 880 – 915 MHz

EGSM RX : 925 – 960 MHz

GSM850 TX : 824 – 849 MHz

GSM850 RX : 869 – 894 MHz

GSM900 TX : 880 – 915 MHz

GSM900 RX : 925 – 960 MHz

DCS1800 TX :1710 – 1785 MHz

DCS1800 RX : 1805 – 1880 MHz

PCS1900 TX : 1850 – 1910 MHz

PCS1900 RX : 1930 – 1990 MHz

Application Standard

2.3 Main Parts : GSM Solution

LG-D285 Product SPEC

2.1 Product Name

LG-D285: WCDMA 900//2100+GSM850/EGSM/DCS/PCS

(HSUPA 5.76Mbps(cat6)/HSDPA 21Mbps(cat14)/GPRS Class12/EDGE Class12)

2.2 Supporting Standard

2.1 Product Name

LG-D285F: WCDMA850//2100+GSM850,GSM900/EGSM/DCS/PCS (HSUPA 5.76Mbps(cat6)/HSDPA 21Mbps(cat14)/GPRS Class12/

2.2 Supporting Standard

EDGE Class12)

2. PERFORMANCE

Supporting Standard

Frequency Range

Application Standard

WCDMA(FDD1,5)/EGSM/GSM850/DCS1800/PCS1900

with seamless handover

Phase 2+(include AMR)

SIM Toolkit : Class 1, 2, 3, C-E

WCDMA(FDD1) TX : 1920 – 1980 MHz

WCDMA(FDD1) TX : 1920 – 1980 MHz

WCDMA(FDD1) RX : 2110 – 2170 MHz

WCDMA(FDD1) RX : 2110 – 2170 MHz

WCDMA(FDD5) TX : 826 – 847 MHz

WCDMA(FDD8) TX : 880 – 915 MHz

WCDMA(FDD8) RX : 925 – 960 MHz

WCDMA(FDD5) RX : 869 – 894 MHz

EGSM TX : 880 – 915 MHz

EGSM RX : 925 – 960 MHz

GSM850 TX : 824 – 849 MHz

GSM850 RX : 869 – 894 MHz

GSM900 TX : 880 – 915 MHz

GSM900 RX : 925 – 960 MHz

DCS1800 TX :1710 – 1785 MHz

DCS1800 RX : 1805 – 1880 MHz

PCS1900 TX : 1850 – 1910 MHz

PCS1900 RX : 1930 – 1990 MHz

2.3 Main Parts : GSM Solution

Item Part Name Comment

Digital Baseband MSM8210 : Qualcomm

Analog Baseband PM8110 : Qualcomm

RF Chip WTR2605 : Qualcomm

LGE Internal Use Only

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Copyright © 2014 LG Electronics. Inc. All right reserved.

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2.4 HW Features

LG-D285 Product SPEC

2.4 HW Features

List Type / Spec.

1. Phone Type DOP Type

2. PERFORMANCE

2. Size

3. Weight 125.3g

4. Battery 2,100mAh ( typ.), 2,040mAh(min) (Li-Ion)

5.Chipset MSM8210

6. Memory 4GB(EMMC) +8Gb(LPDDR2)

Size 4.3 inch

Dot 480(H) X 800(V)

Color 16.7M colors

7. LCD

7. LCD

Display Type Active matrix TFT, Transmissive Type

NTSC Typ. 70%

Contrast Ratio Typ. 1000:1

127.2 x 66.8 x 9.65(mm)

8. Main Camera (5M)

LGE Internal Use Only

Pixel Pitch(mm) 0.039 * RGB(V) * 0.117(H) (208PPI)

Type CMOS image sensor

Resolution 2592(H) X 1944(V) pixels.

Frame Rate

View Angle 68°

Image Scaling Down 5M,3M,W3M,1M,W1M

Pixel x size 1.4um x1.4um

- 9 -

30fps@QSXGA, 30fps@Full HD 1080P

60fps@HD 720P, 120fps@QVGA

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LG-D285 Product SPEC

1) MIDI MIDI

2. PERFORMANCE

10. Audio

2) Mono 18 X 10 X 3T Speaker

3) Receiver 13 X 07 X 2.7T Wideband Receiver

Effective Distance 10M

11. Bluetooth

Distance 0 m ~ 10 m (depend on environment)

standard IEEE 802.11 b/g/n

Max 40Mbps (SDIO Driver

12. WLAN

Throughput

performance)

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

13. GPS type A-GPS, GNSS

LGE Internal Use Only

- 10 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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2.5 HW SPEC

LG-D285 Product SPEC

2.5 HW SPEC.

1) WCDMA transmitter specification

2. PERFORMANCE

1) WCDMA transmitter specication

Item Spec. Min Typ. Max Unit

Maximum Output

Power

Frequency

Accuracy

Minimum Output

Power

Occupied

Bandwidth

Adjacent Channel

Leakage Power

Ratio

Power class Ⅲ

Δf =  5MHz

Δf =  10MHz

21.0 23.5 25.0

- -200 - +200 Hz

- - - -50 dBm/3.84MHz

- - - 4.6 MHz

- - -33 dBm/3.84MHz

- - -43 dBm/3.84MHz

dBm/3.84MHz

Error Vector

Magnitude(EVM)

Peak Code

Domain Error

Open Loop

Output Power

Transmit Off

Power

Spectrum

Emission Mask

- - - 17

- - - 15

Ior =-106.7dBm/3.84MHz -46.7 - -28.7

Ior =-65.7dBm/3.84MHz -23.0 - -5.0

Ior =-25.0dBm/3.84MHz -0.0 - 14.0

- - - -56 dBm/3.84MHz

Δf = 2.5~3.5MHz -35-15 * (Δf-2.5) dBc/30KHz

Δf = 3.5~7.5MHz -35-1 * (Δf-3.5) dBc/1MHz

dBm/3.84MHz

dBm/3.84MHz

dBm/3.84MHz

dBm/3.84MHz

%

LGE Internal Use Only

- 11 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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2. PERFORMANCE

LG-D285 Product SPEC

Δf = 7.5~8.5MHz -39 10 * (Δf-7.5) dBc/1MHz

Δf = 8.5~12.5MHz -49 dBc/1MHz

9kHz ~ 150kHz -36 dBm

Transmit Spurious

Emission

150kHz ~ 30MHz -36 dBm

30MHz ~ 1GHz -36 dBm

1GHz ~ 12.5GHz -30 dBm

LGE Internal Use Only

- 12 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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2) WCDMA receiver specication

LG-D285 Product SPEC

2) WCDMA receiver specification

Item Specification

2. PERFORMANCE

BD1: 2110 ~ 2170 MHz

Receive Frequency

Reference Sensitivity Level

<REFÎ

>

or

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

Adjacent Channel Selectivity

(ACS)

Blocking Characteristic

Spurious Response

BD5: 869 MHz ~ 894 MHz

BD8: 925 MHz ~ 960 MHz

Band1 : BER < 0.001 when Îor = -106.7 dBm / 3.84 MHz

Band5 : BER < 0.001 when Îor = -104.7 dBm / 3.84 MHz

Band8 : BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz

ACS > 33 dB where BER < 0.001 when

Îor = <REFÎ

> + 14 dB / 3.84 MHz

or

& Ioac = –52 dBm / 3.84 MHz @ ±5 MHz

BER < 0.001 when Îor = <REFÎ

> + 3 dB / 3.84 MHz

or

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

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

BER < 0.001 when Îor = <REFÎ

> + 3 dB / 3.84 MHz

or

& Iblocking = -44 dBm

BER < 0.001 when Îor= <REFÎ

> + 3 dB / 3.84 MHz

or

Intermodulation

Spurious Emissions

Inner Loop Power Control

In Uplink

LGE Internal Use Only

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

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

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

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

Adjust output(TPC command)

cmd 1dB 2dB 3dB

+1 +0.5/1.5 +1/3 +1.5/4

0 -0.5/+0.5 -0.5/+0.5 -0.5/+0.5

-1 -0.5/-1.5 -1/-3 -1.5/-4

group(10equal command group)

+1 +8/+12 +16/+24

- 13 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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2. PERFORMANCE

LG-D285 Product SPEC

3) HSDPA transmitter specification

3) HSDPA transmitter specication

Item Spec. Min Typ. Max Unit

Trands

mitter

5.2.A

Maximum

Output Power

with HS-

DPCCH

5.7A HS­DPCCH

5.9A Spectrum
Emission Mask

with HS-

DPCCH

1/15  c/d  12/15

13/15  c/d  15/8

15/7  c/d  15/0

Step 0

Step 1 – Step 0

MAX /

0dBm

Step 2 – Step 3

Step 5 – Step 4

Step 6 – Step 7

Δf = 2.5~3.5MHz -35-15 * (Δf-2.5) dBc/30KHz

Δf = 3.5~7.5MHz -35-1 * (Δf-3.5) dBc/1MHz

Δf = 7.5~8.5MHz -39 10 * (Δf-7.5) dBc/1MHz

21.0

20

19

22.5

22.5

22

0 dBm +/- 1 dB dB

6 dB +/- 2.3 dB dB

1 dB +/- 0.6 dB dB

0 dB +/- 0.6 dB dB

5 dB +/- 2.3 dB dB

25.0

25

25

dBm/3.84MHz

5.10A Adjacent

Leakage Power

(EVM) with HS-

6.3A Maximum

Receiver

LGE Internal Use Only

Input Level for

Channel

Ratio with HS-

DPCCH

5.13.1A Error
Vector

Magnitude

DPCCH

HS-PDSCH

Reception

Δf = 8.5~12.5MHz -49 dBc/1MHz

Δf =  5MHz

Δf =  10MHz

MAX Power

-20 dBm

Pin = -25dBm - - 10 BLER(%)

- 14 -

- - -33 dBm/3.84MHz

- - -43 dBm/3.84MHz

- - 17.5

Copyright © 2014 LG Electronics. Inc. All right reserved.

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%

LG-D285 Product SPEC

4) GSM receiver specification

/

4) GSM receiver specication

2. PERFORMANCE

Item Spec.

EMC(Radiated Spurious Emission

Transmitter Output power and Burst Timing

Spectrum due to modulation out to less

Spectrum due to modulation out to larger

than 1800kHz offset to the edge of the

Phase Error Rms : 5°

Frequency Error

Disturbance)

Burst Timing <3.69us

than 1800kHz offset

transmit band

Peak : 20 °

GSM : 0.1 ppm

DCS/PCS : 0.1 ppm

3000kHz-6000kHz : <-65dBc(-46dBm)

GSM/DCS : < -28dBm

GSM : 5dBm – 33dBm ± 3dB

DCS/PCS : 0dBm – 30dBm ± 3dB

200kHz : -36dBm

600kHz : -51dBm/-56dBm

GSM :

1800-3000kHz :< -63dBc(-46dBm)

6000kHz < : < -71dBc(-46dBm)

DCS :

Spectrum due to switching transient

Reference Sensitivity – TCH/FS Class II(RBER) : -105dBm(2.439%)

Usable receiver input level range 0.012(-15 - -40dBm)

Intermodulation rejection – Speech

channels

AM Suppression

- GSM : -31dBm - DCS : -29dBm

Timing Advance ± 0.5T

LGE Internal Use Only

1800-3000kHz :< -65dBc(-51dBm)

6000kHz < : < -73dBc(-51dBm)

400kHz : -19dBm/-22dBm(5/0), -23dBm
600kHz : -21dBm/-24dBm(5/0), -26dBm

- 15 -

± 800kHz, ± 1600kHz

: -98dBm/-96dBm (2.439%)

-98dBm/-96dBm (2.439%)

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LG-D285 Product SPEC

5) Bluetooth transmitter specification

5) Bluetooth transmitter specication

2. PERFORMANCE

Tx Output Spectrum

Tx Output Spectrum

Item Spec. Min Typ. Max

Output Power

Power Density

Power Control

Frequency Range

DH5

PRBS9

DH5

PRBS9

DH1

PRBS9

DH5

PRBS9

DH5

(20dB BW)

(Adjacent Output

Power)

PRBS9

DH5

PRBS9

Power

(Class I)

@100kHz

RBW

Step size

Power(min)

0 - +20

- +20

2 - 8 dB

- 4 dBm

-30dBc

@100kHz

2400 - 2483.5 MHz

RBW

H-fL

- 1 MHz

Δf =f

@M-N = 2 - -20

@M-N  3

- -40

Unit

dBm

dBm

dBm

dBm

Modulation Index

Initial Carrier Freq.

Tolerance

Carrier Frequency Drift

DH5

11110000

DH5

10101010

f2

DH5

PRBS9

DH1

Freq. Drift -25 - +25

10101010

Drift Rate -20 - +20

Freq. Drift -40 - +40

DH3

10101010

Drift Rate -20 - +20

Freq. Drift -40 - +40

DH5

10101010

Drift Rate -20 - +20

AVG

f1

f2

AVG

MAX

/f1

AVG

140 - 175

115 -

0.8 -

-75 - +75

kHz

kHz

kHz

kHz

kHz/50us

kHz

kHz/50us

kHz

kHz/50us

LGE Internal Use Only

- 16 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

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LG-D285 Product SPEC

6) Bluetooth receiver specification

6) Bluetooth receiver specication

2. PERFORMANCE

Item

Sensitivity

(Single Slot Packet)

Sensitivity

(Multi Slot Packet)

C/I Performance*

Input power @BT_w

Input power @BT_w

Input power @BT_i

DH1

PRBS9

DH5

PRBS9

DH1

PRBS9

Spec.

BER=0.1%

C/I@Co-Channel

C/I @ Image1MHz

-

-

-60dBm @ BT

C/I @1MHz

-60dBm@ BT

C/I @2MHz

-60dBm@ BT

C/I @≥3MHz

-67dBm@ BT

C/I @Image

-67dBm@ BT

-67dBm@ BT

Min Typ. Max Unit

- -70 dBm

- -70 dBm

- 11

- 0

- -30
dB

- -40

- -9

- -20

Blocking Performance

Intermodulation

Performance

Maximum Input Level

DH1

PRBS9

Input power @CW

DH1

PRBS9

Input power @CW_i

DH1

PRBS9

Input power @BT_w

30M ~2 GHz

-67dBm@ BT

2 ~ 2.4 GHz

-67dBm@ BT

2.5 ~ 3 GHz

-67dBm@ BT

3 ~ 12.75 GHz

-67dBm@ BT

Δf = +5MHz (CW_i)
Δf = +10MHz (BT_i)

-64dBm@ BT_w

Δf = -5MHz (CW_i)

Δf = -10MHz (BT_i)

-64dBm@ BT_w

- -20 -

-10 -

-27 -

-27 -

-10 -

-39 -

-39 -

dBm

dBm

dBm

dBm

LGE Internal Use Only

- 17 -

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LG-D285 Product SPEC

7) WLAN 802.11b transceiver specification

7) WLAN 802.11b transceiver specication

Item Specification

2. PERFORMANCE

Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13)

Tx Power Level

Frequency Tolerance within ±25 PPM

Chip clock Frequency

Tolerance

≤ -30 @ fc-22MHz< f <fc-11MHz and fc+11MHz< f <fc+22MHz

Spectrum Mask

Power ramp on/off time

Carrier Suppression

Modulation Accuracy

(Peak EVM)

≤ 20dBm under (Europe), ≤ 30dBm under (USA)

within ±25 PPM

≤ -50 @ f < fc-22MHz and f > fc+22MHz

≤ 2us

≤ -15dB

≤ 35%

Spurious Emissions

Rx Min input Sensitivity

Rx Max input Sensitivity

Rx Adjacent Channel

Rejection

LGE Internal Use Only

< -36 dBm @ 30MHz ~ 1GHz

< -30 dBm above @ 1GHz ~ 12.75GHz

< -47 dBm @ 1.8GHz ~ 1.9GHz

< -47 dBm @ 5.15GHz ~ 5.3GHz

≤ -76dBm(1Mbps,2Mbps,5.5Mbps,11Mbps) @ FER ≤ 8%

≥ -10dBm(1Mbps,2Mbps,5.5Mbps,11Mbps) @ FER ≤ 8%

≥ 35dB @FER ≤ 8%,

interference input signal -70dBm@fc±25MHz(11Mbps)

- 18 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

2. PERFORMANCE

LG-D285 Product SPEC

8) WLAN 802.11g transceiver specification

8) WLAN 802.11g transceiver specication

Item Specification

Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13)

Tx Power Level

Frequency Tolerance within ±25 PPM

Chip clock Frequency

Tolerance

Spectrum Mask

Transmitter constellation error

(rms EVM)

≤ 20dBm under (Europe), ≤ 30dBm under (USA)

within ±25 PPM

≤ -20 @ ±11MHz offset (9Mhz ~ 11MHz)

≤ -28 @ ±20MHz offset (11MHz ~ 20Mhz)

≤ -40 @ ±30MHz offset (20MHz ~ 30Mhz)

≤ -5dB

Spurious Emissions

Rx Min input Sensitivity

Rx Max input Sensitivity

Rx Adjacent Channel

Rejection

< -36 dBm @ 30MHz ~ 1GHz

< -30 dBm above @ 1GHz ~ 12.75GHz

< -47 dBm @ 1.8GHz ~ 1.9GHz

< -47 dBm @ 5.15GHz ~ 5.3GHz

PER ≤ 10%

-82dBm@6Mbps, -81dBm@9Mbps, -79dBm@12Mbps

-77dBm@18Mbps, -74dBm@24Mbps, -70dBm@36Mbps

-66dBm@48Mbps, -65dBm@54Mbps

≥ -20dBm(6,9,12,18,24,36,48,54Mbps) @ PER ≤ 10%

PER ≤ 10%,

ACR ≥ 16dB@6Mbps, ACR ≥ 15dB@9Mbps,

ACR ≥ 13dB@12Mbps, ACR ≥ 11dB@18Mbps,

ACR ≥ 8dB@24Mbps, ACR ≥ 4dB@36Mbps

ACR ≥ 0dB@48Mbps, ACR ≥ -1dB@54Mbps

※ACR shall be measured by setting the desired signal's

LGE Internal Use Only

strength 3 dB above the rate-dependent

sensitivity specified in min input sensitivity

- 19 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LG-D285 Product SPEC

9) WLAN 802.11n transceiver specification

9) WLAN 802.11n transceiver specication

2. PERFORMANCE

Transmit Frequency

Item Specification

Tx Power Level ≤ 20dBm under (Europe), ≤ 30dBm under (USA)

Frequency Tolerance within ±25 PPM

Chip clock Frequency Tolerance within ±25 PPM

Spectrum Mask ≤ -20 @ ±11MHz offset (9Mhz ~ 11MHz)

Transmitter constellation error

(rms EVM)

Spurious Emissions < -36 dBm @ 30MHz ~ 1GHz

2400 MHz ~ 2483.5 MHz ( CH1~CH13)

≤ -28 @ ±20MHz offset (11MHz ~ 20Mhz)

≤ -45 @ ±30MHz offset (20MHz ~ 30Mhz)

≤ -5dB@6.5Mbps, ≤ -10dB@13Mbps, ≤ -13dB@19.5Mbps,

≤ -16dB@26Mbps, ≤ -19dB@39Mbps, ≤ -22dB@52Mbps,

≤ -25dB@58.5Mbps, ≤ -28dB@65Mbps

< -30 dBm above @ 1GHz ~ 12.75GHz

< -47 dBm @ 1.8GHz ~ 1.9GHz

< -47 dBm @ 5.15GHz ~ 5.3GHz

Rx Min input Sensitivity PER ≤ 10%

-82dBm@6.5Mbps, -79dBm@13Mbps, -77dBm@19.5Mbps

-74dBm@26Mbps, -70dBm@39Mbps, -66dBm@52Mbps

-65dBm@58.5Mbps, -64dBm@65Mbps

Rx Max input Sensitivity ≥ -20dBm(6.5,13,19.5,26,39,52,58.5,65Mbps) @ PER ≤ 10%

Rx Adjacent Channel

Rejection

ACR ≥ 16dB@6.5Mbps, ACR ≥ 13dB@13Mbps,

ACR ≥ 11dB@19.5Mbps, ACR ≥ 8dB@26Mbps,

ACR ≥ 4dB@39Mbps, ACR ≥ 0dB@52Mbps

ACR ≥ -1dB@58.5Mbps, ACR ≥ -2dB@65Mbps

※ACR shall be measured by setting the desired signal's strength

3 dB above the rate-dependent

sensitivity specified in min input sensitivity

PER ≤ 10%,

LGE Internal Use Only

- 20 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

10) GPS receiver specication

LG-D285 Product SPEC

10) GPS receiver specification

LG-D285 Product SPEC

10) GPS receiver specification

Item Spec.

Sensitivity Test

Success rate ≥ 60% @ -154 dBm

11) Current consumption

** Test condition for Standby current consumption should be as below.

: Measurement time 1hr, with Agilent & CMT JIG

Item Spec.

2. PERFORMANCE

Sensitivity Test

11) Current consumption

** Test condition for Standby current consumption should be as below.

: Measurement time 1hr, with Agilent & CMT JIG

Item

1. Sleep Mode Under 3.5mA Under 3.5mA

2. Sleep : connector Ear jack Under 4.5mA Under 4.5mA

WCDMA GSM

Success rate ≥ 60% @ -154 dBm

Specification

3. Current(Sleep & Idle AVG) Under 4.5mA @ DRX 7 Under 4.5mA @ P.P 5

4. BT Connected idle Under 6mA Under 6mA

5. Talk Mode

6. No SVC Mode under 200mA Under 200 mA

7. Power Off Mode under 300uA Under 300 uA

LGE Internal Use Only

- Max Pwr

Under 600mA @ Avg

- Tx 10dBm
Under 400 mA @ Avg

- 21 -

GSM LVL 5

under 400 mA @ Avg

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LG-D285 Product SPEC

12) RSSI indicator (Based on Cell power)

BAR GSM/DCS/PCS WCDMA

54

-89±2dBm

-91±2dBm

43

-94±2dBm

-96±2dBm

32

-100±2dBm

-99±2dBm

21

-104±2dBm

-103±2dBm

10

-110±2dBm

-105±2dBm

13) Current consumption

LG-D285 Product SPEC

12) RSSI indicator (Based on Cell power)

BAR GSM/DCS/PCS WCDMA

54

-89±2dBm

-91±2dBm

43

-94±2dBm

-96±2dBm

32

-100±2dBm

-99±2dBm

21

-104±2dBm

-103±2dBm

10

-110±2dBm

-105±2dBm

13) Current consumption

Standby

(WCDMA)

Over 466 Hours

Under 4.5mA

DRX 7 @ BATT Capacity : 2100mAh

14) Charging hour

Under 4 hour (2100mAh battery, 700mA TA)

12) RSSI indicator (Based on Cell power)

LG-D285 Product SPEC

12) RSSI indicator (Based on Cell power)

2. PERFORMANCE

BAR GSM/DCS/PCS WCDMA

13) Current consumption

54

43

32

21

10

Standby

(WCDMA)

Over 466 Hours

Under 4.5mA

WCDMA GSM/DCS/PCS

-89±2dBm

-94±2dBm

-100±2dBm

-104±2dBm

-110±2dBm

DRX 7 @ BATT Capacity : 2100mAh

14) Charging hour

-91±2dBm

-96±2dBm

-99±2dBm

-103±2dBm

-105±2dBm

Under 4 hour (2100mAh battery, 700mA TA)

LGE Internal Use Only

- 22 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

15) Battery indicator

2. PERFORMANCE

Battery Bar Specication Battery Bar Specication

BAR 20 (Full) 98% over BAR 9 --> 8 43% -> 42%

BAR 20 --> 19 98% -> 97% BAR 8 --> 7 38% -> 37%

BAR 19 --> 18 93% -> 92% BAR 7 --> 6 33% -> 32%

BAR 18 --> 17 88% -> 87% BAR 6 --> 5 28% -> 27%

BAR 17 --> 16 83% -> 82% BAR 5 --> 4 23% -> 22%

BAR 16 --> 15 78% -> 77% BAR 4 --> 3 18% -> 17%

BAR 15 --> 14 73% -> 72% BAR 3 --> 2 13% -> 12%

BAR 14 --> 13 68% -> 67% BAR 2 --> 1 8% -> 7%

BAR 13 --> 12 63% -> 62% BAR 1 --> 0 3% -> 2%

BAR 12 --> 11 58% -> 57% Power o 1%

BAR 11 --> 10 53% -> 52% Low Battery Pop-up 15%, 5%, 0%

BAR 10 --> 9 48% -> 47%

LGE Internal Use Only

- 23 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LG-D285 Product SPEC

2.6 D285 Figures

2.6 D285F Figures

2. PERFORMANCE

LGE Internal Use Only

- 24 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

3.1 WCDMA Rx Part

3.1.1 WCDMA_B1 Rx

3. TROUBLE SHOOTING

START

Rx TEST SETUP

- DL Channel : 10700

- Sector Power : -30 dBm

1. Check

DC Power Supply circuit

2. Check WTR2605 XO

3.Check RF Signal path

Re download S/W & Cal

※ there are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form

LGE Internal Use Only

- 25 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

WTR2605

(U3000)

3. TROUBLE SHOOTING

SKY77573­31 (U1000)

DPX

(FL2001)

<Main Top>

LGE Internal Use Only

- 26 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.1.1 Checking DC Power supply circuit

START

3. TROUBLE SHOOTING

Check TP1(C3001)

+2V05_VREG_L9 is OK?

Yes

Check TP2(C3007)

+1V225_VREG_L1 is OK?

Yes

Check TP3(C3016)

+1V8_VREG_L10 is OK?

Yes

DC Power Supply Circuit is OK

See Next page to Check XO Circuit

No

No

No

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

LGE Internal Use Only

- 27 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : C3001

(+2V05_VREG_L9)

TP2: C3007

(+1V225_VREG_L1)

3. TROUBLE SHOOTING

TP3: C3016
(+1V8_VREG_L10)

WTR2605

(U3000)

+2V05_VREG_L9

Tuning point (Inductor Placeholder)

0

R3007

+1V225_VREG_L1

TP2

TP1

<Main Top>

C3001 4.7u

C3002 0.1u

C3003 0.1u

C3007

4.7u

0.1uC3004

0.1uF STAR ROUTE

C3005 0.1u

C3006

0.1u

10nL3001

0.1uC3010

0.1uC3009

0.1uC3011

STAR ROUTE

0.1uC3012

19

VDD_RF2_R_BB

16

VDD_RF2_T_DA

37

VDD_RF2_T_VCO

52

VDD_RF2_T_PLL

40

VDD_RF2_R_PLL

54

VDD_RF2_XO

39

VDD_RF1_R_VCO

46

VDD_RF1_T_PLL

26

VDD_RF1_T_LO

30

VDD_RF1_R_LO

20

VDD_RF1_LNA

48

VDD_RF1_DIG

31

VDD_RF1_G_LO

21

VDD_RF1_G_PLL

59

VDD_RF3_IO

U3000

+1V8_VREG_L10

LGE Internal Use Only

TP3

C3016 0.1u

- 28 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.1.2 Checking WTR2605 XO circuit

START

3. TROUBLE SHOOTING

Check TP1(R3005)

Is it 19.2MHz?

NO

Replace X4100 and then check

TP1(R3005)

Is it similar ?

NO

Replace Main B/D

YES

YES

XO circuit is Ok . See next page

to check RF signal path.

XO circuit is Ok . See next page

to check RF signal path.

LGE Internal Use Only

- 29 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : R3005
(WTR_XO_IN)

3. TROUBLE SHOOTING

WTR2605

(U3000)

U3000

RX_BB_IP

RX_BB_IM

RX_BB_QP

RX_BB_QM

XO_IN

GNSS_BB_IP

GNSS_BB_IM

GNSS_BB_QP

GNSS_BB_QM

61
55
49
43
60
62
51
45
41

<Main Top>

100pC3008 R3005 0

TP1

WTR0_PRXBB_I_P
WTR0_PRXBB_I_N
WTR0_PRXBB_Q_P
WTR0_PRXBB_Q_N
WTR_XO_IN
WTR0_GNSSBB_I_P
WTR0_GNSSBB_I_N
WTR0_GNSSBB_Q_P
WTR0_GNSSBB_Q_N

WTR_XO_IN

C3013

DNI

WTR0_XO_IN

LGE Internal Use Only

- 30 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.1.3 Checking RF signal path (TX Module)

START

3. TROUBLE SHOOTING

Check TP1(C1002) at U1000

Check if there is any major dierence referring

To Figure 3.1.1(b). Is any signal detected at that

point?

Yes

Check TP2(C2038) at FL2001

Check if there is any major dierence referring

To Figure 3.1.1(c). Is any signal detected at that

point?

Yes

Is any signal detected at

that point?

No

No

No

Check L1001,C1001, L1000, SW1001

Check TP3(C1023),TP4(C1024),TP5(C1019),

TP6(C1020) at U1000. Is any DC signal detected

at that points?

Yes

Replace U1000

Check C2038

No

TX module is OK. See next page to check DPX

LGE Internal Use Only

Yes

The Problem may be Logic part

Refer to Logic troubleshoot

- 31 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP5

3. TROUBLE SHOOTING

TP4

TP6

SW1000

G1

SKY77573-31

TP1

ANTG2

(U1000)

TP3

TP2

<Main Top>

1nC1000

SW1001

ANT COMMON

G3 G4

43

21

C1001 3.3n

L1000

27n

L1001

0.5p

C1002

1n

TP1

LGE Internal Use Only

- 32 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

Boost Option

+VPWR_BOOST_BYP

GND15

22

GND16

23

C1013

4.7u

TRX1

24

GND17

25

TRX2

26

GND18

27

TRX3

28

GND19

29

TRX4

30

GND20

31

VBATT

32

NC1

33

TX_MODULE_TRX_1

TX_MODULE_TRX_2

TX_MODULE_TRX_4

C1112

22p

TP3

ANT0_SW_SEL_0

DNI

R1006

SPDT_SEL

C1113

100p

100p

C1023

C1024

100p

100p

R1004

WTR_TX1_OUT PA0_R_0

C1060

0

DNI

R1005

21

20

RX2

SPDT_OUT

SKY77573-31

NC2

34

TP4

19

18

RX1

SPDT_IN

U1000

RF_IN36SPDT35SW038SW1

37

TP5

16

GND1417GND13

HB_EN

39

13

14

15

ANT

GND12

GND11

GND10

GND9
GND8
GND7
GND6
GND5

GND4
VCC2
VCC1
GND3

GND2

GND1

LB_EN40MODE041MODE142PGND

43

TP6

C1019 100p

100p

C1020

12

11

10

9

8

7

6

5

4

3

2

1

C1015

100p

Boost Option

C1017

C1016

10n

4.7u

PA0_R_1

ANT0_SW_SEL_3
ANT0_SW_SEL_2ANT0_SW_SEL_1

100p

100p

C1022

C1021

W-BAND DPX

B1

B2

EAM62692801(B5897)

EAM62890101(B8613)

TRX B1

FL2001

ANT

GND1 GND6

GND2 GND5

GND3 GND4

16

RX

3

TX

92

84

75

TX_MODULE_TRX_1

TP2

4.7pC2038

L2003

2p

3nC2039

L2010

DNI

+VPWR_BOOST_BYP

B1

C2037

100p

L2011

DNI

LGE Internal Use Only

- 33 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 3.1.1 (b) TP1

2.140GHz

2.140GHz

3. TROUBLE SHOOTING

LGE Internal Use Only

Figure 3.1.1 (c) TP2

- 34 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.1.4 Checking RF signal path(Duplexer)

START

3. TROUBLE SHOOTING

Check TP1(C2062) at FL2001

Check if there is any major dierence referring

To Figure 3.1.1(b) Is any signal detected at

that point?

Yes

Is any signal detected at that point?

Yes

All WCDMA_B1 Rx check is complete.

If the phone sill do not work ,replace main board

No

No

Check C2037, C2062, C2027, C2028

Replace FL2001

LGE Internal Use Only

- 35 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1

3. TROUBLE SHOOTING

LNA_PRX_MB1_IN

C2062

TP1

FL2001 DPX

<Main Top>

2.7n

L2002

C2028

DNI

C2030

DNI

33p

C2027

33p

B1

WTR_PRX_MB_1_IN

LGE Internal Use Only

- 36 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 3.1.1 (b)

2.140GHz

3. TROUBLE SHOOTING

LGE Internal Use Only

- 37 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.2 WCDMA_B5 Rx

3. TROUBLE SHOOTING

START

Rx TEST SETUP

- Test Channel : 4407

- Sector Power : -30 dBm

1. Check

DC Power Supply circuit

2. Check WTR2605 XO

3. Check RF Signal Path

Re download S/W, Cal

* There are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form.

LGE Internal Use Only

- 38 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

WTR2605

(U3000)

3. TROUBLE SHOOTING

SKY77573­31 (U1000)

DPX

(FL2002)

<Main Top>

LGE Internal Use Only

- 39 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.2.1 Checking DC Power supply circuit

START

3. TROUBLE SHOOTING

Check TP1(C3001)

+2V05_VREG_L9 is OK?

Yes

Check TP2(C3007)

+1V225_VREG_L1 is OK?

Yes

Check TP3(C3016)

+1V8_VREG_L10 is OK?

Yes

No

The Problem may be Logic part

Refer to Logic troubleshoot

No

The Problem may be Logic part

Refer to Logic troubleshoot

No

The Problem may be Logic part

Refer to Logic troubleshoot

DC Po wer su pply Circuit is OK. See next

LGE Internal Use Only

Page to check XO circuit

- 40 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : C3001

(+2V05_VREG_L9)

TP2: C3007

(+1V225_VREG_L1)

3. TROUBLE SHOOTING

TP3: C3016
(+1V8_VREG_L10)

WTR2605

(U3000)

+2V05_VREG_L9

Tuning point (Inductor Placeholder)

0

R3007

+1V225_VREG_L1

TP2

TP1

<Main Top>

C3001 4.7u

C3002 0.1u

C3003 0.1u

C3007

4.7u

0.1uC3004

0.1uF STAR ROUTE

C3005 0.1u

C3006

0.1u

10nL3001

0.1uC3010

0.1uC3009

0.1uC3011

STAR ROUTE

0.1uC3012

19

VDD_RF2_R_BB

16

VDD_RF2_T_DA

37

VDD_RF2_T_VCO

52

VDD_RF2_T_PLL

40

VDD_RF2_R_PLL

54

VDD_RF2_XO

39

VDD_RF1_R_VCO

46

VDD_RF1_T_PLL

26

VDD_RF1_T_LO

30

VDD_RF1_R_LO

20

VDD_RF1_LNA

48

VDD_RF1_DIG

31

VDD_RF1_G_LO

21

VDD_RF1_G_PLL

59

VDD_RF3_IO

U3000

+1V8_VREG_L10

LGE Internal Use Only

TP3

C3016 0.1u

- 41 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.2.2 Checking MT6162 XO circuit

START

3. TROUBLE SHOOTING

Check TP1(R3005)

Is it 19.2MHz?

No

Replace X4100 and then check

TP1(R3005)

Is it similar ?

No

Replace Main B/D

Yes

Yes

XO circuit is Ok. See next page

to check RF signal path

XO circuit is Ok. See next page

to check RF signal path.

LGE Internal Use Only

- 42 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : R3005
(WTR_XO_IN)

3. TROUBLE SHOOTING

WTR2605

(U3000)

U3000

RX_BB_IP

RX_BB_IM

RX_BB_QP

RX_BB_QM

XO_IN

GNSS_BB_IP

GNSS_BB_IM

GNSS_BB_QP

GNSS_BB_QM

61
55
49
43
60
62
51
45
41

<Main Top>

100pC3008 R3005 0

TP1

WTR0_PRXBB_I_P
WTR0_PRXBB_I_N
WTR0_PRXBB_Q_P
WTR0_PRXBB_Q_N
WTR_XO_IN
WTR0_GNSSBB_I_P
WTR0_GNSSBB_I_N
WTR0_GNSSBB_Q_P
WTR0_GNSSBB_Q_N

WTR_XO_IN

C3013

DNI

WTR0_XO_IN

LGE Internal Use Only

- 43 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.2.3 Checking RF signal path (Tx Module)

START

3. TROUBLE SHOOTING

Check TP1(C1002) at U1000

Check if there is any major dierence referring

To Figure 3.1.1(b). Is any signal detected at that

point?

Yes

Check TP2(C2050) at FL2002

Check if there is any major dierence referring

To Figure 3.1.1(c). Is any signal detected at that

point?

Yes

Is any signal detected at that point?

No

No

No

Check L1001,C1001, L1000, SW1001

Check TP3(C1023),TP4(C1024),TP5(C1019),

TP6(C1020) at U1000. Is any DC signal detected

at that points?

Yes

Replace U1000

Check C2050

No

TX module is OK. See next page to check DPX

LGE Internal Use Only

Yes

The Problem may be Logic part

Refer to Logic troubleshoot

- 44 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP5

3. TROUBLE SHOOTING

TP4

TP6

SW1000

G1

SKY77573-31

TP1

ANTG2

(U1000)

TP3

TP2

<Main Top>

1nC1000

SW1001

ANT COMMON

G3 G4

43

21

C1001 3.3n

L1000

27n

L1001

0.5p

C1002

1n

TP1

LGE Internal Use Only

- 45 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

Boost Option

+VPWR_BOOST_BYP

GND15

22

GND16

23

C1013

4.7u

TRX1

24

GND17

25

TRX2

26

GND18

27

TRX3

28

GND19

29

TRX4

30

GND20

31

VBATT

32

NC1

33

TX_MODULE_TRX_1

TX_MODULE_TRX_2

TX_MODULE_TRX_4

C1112

22p

TP3

ANT0_SW_SEL_0

DNI

R1006

TP2

SPDT_SEL

L2004

6.8n

C1113

100p

C1023

100p

C1024

100p

FL2002

6

ANT

GND12GND6

GND24GND5

GND35GND4

100p

R1004

WTR_TX1_OUT PA0_R_0

C1060

0

DNI

R1005

TX_MODULE_TRX_4 WTR_PRX_LB_1_IN

21

20

RX2

SPDT_OUT

SKY77573-31

NC2

34

TP4

19

RX1

SPDT_IN

U1000

RF_IN36SPDT35SW038SW1

TP5

RX

TX

18

GND1417GND13

37

1

3

9

8

7

14

15

16

ANT

GND12

LB_EN40MODE041MODE142PGND

HB_EN

39

13

GND11

GND10

TP6

C1019 100p

GND9
GND8
GND7
GND6
GND5

GND4

VCC2
VCC1

GND3

GND2

GND1

43

100p

C1020

12

11

10

9

8

7

6

5

4

3

2

1

C1015

100p

Boost Option

C1017

C1016

10n

4.7u

+VPWR_BOOST_BYP

PA0_R_1

ANT0_SW_SEL_3
ANT0_SW_SEL_2ANT0_SW_SEL_1

100p

100p

C1022

C1021

100pC2052C2051 100p100pC2050

C2053 18n

L2007

DNI

LGE Internal Use Only

- 46 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 3.1.1 (b)

Center Frequency :

881.4MHz

Center Frequency :

881.4MHz

3. TROUBLE SHOOTING

TP1

TP2

Figure 3.1.1 (c)

LGE Internal Use Only

- 47 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.1.2.4 Checking RF signal path (FEM)

Center Frequency :

881.4MHz

START

3. TROUBLE SHOOTING

Check TP1(C2050) at FL2002

Check if there is any major dierence referring

To Figure 3.1.1(b) Is any signal detected at

that point?

Yes

Is any signal detected at that point?

Yes

All WCDMA_B5 Rx check is complete.

If the phone sill do not work ,replace main board

No

No

Check C2052, C2053

Replace FL2002

LGE Internal Use Only

Figure 3.1.1 (b)

- 48 -

TP1

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1

FL2002

3. TROUBLE SHOOTING

DPX

<Main Top>

FL2002

6

TX_MODULE_TRX_4 WTR_PRX_LB_1_IN

L2004

6.8n

ANT

GND12GND6

GND24GND5

GND35GND4

1

RX

3

TX

9

8

7

100pC2052C2051 100p100pC2050

TP1

C2053 18n

L2007

DNI

LGE Internal Use Only

- 49 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2 WCDMA Tx Part Trouble

3.2.1 WCDMA_B1 Tx

3. TROUBLE SHOOTING

START

WCDMA B1 Tx TEST SETUP

- Test Channel : 9750

- Sector Power : -55 dBm

1. Check

DC Power Supply Circuit

2. Check WTR2605 XO

3. Check PA

4. Check DPX

5. Check PAM

Re download S/W & Cal

* There are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form

LGE Internal Use Only

- 50 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

U2002

SKY77573­31 (U1000)

WTR2605

(U3000)

DPX

(FL2001)

<Main Top>

LGE Internal Use Only

- 51 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.1.1 Checking DC Power supply circuit

START

3. TROUBLE SHOOTING

Check TP1(C3001)

+2V05_VREG_L9 is OK?

Yes

Check TP2(C3007)

+1V225_VREG_L1 is OK?

Yes

Check TP3(C3016)

+1V8_VREG_L10 is OK?

Yes

No

The Problem may be Logic part

Refer to Logic troubleshoot

No

The Problem may be Logic part

Refer to Logic troubleshoot

No

The Problem may be Logic part

Refer to Logic troubleshoot

DC Po wer su pply Circuit is OK. See next

LGE Internal Use Only

Page to check XO circuit

- 52 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : C3001

(+2V05_VREG_L9)

TP2: C3007

(+1V225_VREG_L1)

3. TROUBLE SHOOTING

TP3: C3016
(+1V8_VREG_L10)

WTR2605

(U3000)

+2V05_VREG_L9

Tuning point (Inductor Placeholder)

0

R3007

+1V225_VREG_L1

TP2

TP1

<Main Top>

C3001 4.7u

C3002 0.1u

C3003 0.1u

C3007

4.7u

0.1uC3004

0.1uF STAR ROUTE

C3005 0.1u

C3006

0.1u

10nL3001

0.1uC3010

0.1uC3009

0.1uC3011

STAR ROUTE

0.1uC3012

19

VDD_RF2_R_BB

16

VDD_RF2_T_DA

37

VDD_RF2_T_VCO

52

VDD_RF2_T_PLL

40

VDD_RF2_R_PLL

54

VDD_RF2_XO

39

VDD_RF1_R_VCO

46

VDD_RF1_T_PLL

26

VDD_RF1_T_LO

30

VDD_RF1_R_LO

20

VDD_RF1_LNA

48

VDD_RF1_DIG

31

VDD_RF1_G_LO

21

VDD_RF1_G_PLL

59

VDD_RF3_IO

U3000

+1V8_VREG_L10

LGE Internal Use Only

TP3

C3016 0.1u

- 53 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.1.2 Checking WTR6205 XO circuit

START

3. TROUBLE SHOOTING

Check TP1(R3005)

Is it 19.2MHz?

No

Replace X4100 and then check

TP1(R3005)

Is it similar ?

No

Replace Main B/D

Yes

Yes

XO circuit is Ok. See next page

to check RF signal path

XO circuit is Ok. See next page

to check RF signal path.

LGE Internal Use Only

- 54 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : R3005
(WTR_XO_IN)

3. TROUBLE SHOOTING

WTR2605

(U3000)

U3000

RX_BB_IP

RX_BB_IM

RX_BB_QP

RX_BB_QM

XO_IN

GNSS_BB_IP

GNSS_BB_IM

GNSS_BB_QP

GNSS_BB_QM

61
55
49
43
60
62
51
45
41

<Main Top>

100pC3008 R3005 0

TP1

WTR0_PRXBB_I_P
WTR0_PRXBB_I_N
WTR0_PRXBB_Q_P
WTR0_PRXBB_Q_N
WTR_XO_IN
WTR0_GNSSBB_I_P
WTR0_GNSSBB_I_N
WTR0_GNSSBB_Q_P
WTR0_GNSSBB_Q_N

WTR_XO_IN

C3013

DNI

WTR0_XO_IN

LGE Internal Use Only

- 55 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.1.3 Checking B1 TX PA

START

3. TROUBLE SHOOTING

Check TP1(C2043) at U2002

Check if there is any major dierence referring

To Figure 3.2.1.4 Is it similar ?

Yes

Check TP2(C2041)at U2002

Check if there is any major dierence referring

To Figure 3.2.1.4 Is it similar ?

No

Check TP3(C2034) at U2002 (VPWR)

Whether it is higher than 1.5V

Yes

No

Check C2043, C2044

Yes

PAM circuits OK, See next page

No

The Problem may be Logic part

Refer to Logic troubleshoot

LGE Internal Use Only

Replace U2002

- 56 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP2(RF OUT)

TP3(+VPWR)

3. TROUBLE SHOOTING

TP1(RF IN)

<Main Top>

LGE Internal Use Only

- 57 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

+VPWR_BOOST_BYP

TP3(+VPWR)

C2036

C2034

1n

10u

CPL_IN_OUT

14

17

15

3. TROUBLE SHOOTING

+VPWR_BOOST_BYP

C2031

C2033

10u

1n

16

1

C2041

2.2p

C2045

5.6n

TP2(RF OUT)

B5(G850)

C2055

L2005

0.5p

Place matching components near WTR

C2043 100p

B1
B8

C2044

DNI

TP1(RF IN)

WTR_TX3_OUT

B1,B8

C2046

12n

GND6

PGND

CPLIN

VBATT

GND5
VCC
GND4

RFOUTHB

U2002

SKY77742-21

CPLOUT

GND2

GND3

9

RFIN

VENHB

VENLB

VMODERFOUTLB

GND1

6

738

13
12
11
10 5

2

C2049

100p

PA0_ON_1
PA0_ON_2

PA0_R_0

4

C2048

C2047

100p

100p

WTR_PDET_IN

3.9n

L2006
DNI

LGE Internal Use Only

- 58 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

1.950GHz

1.950GHz

TP1

TP2

Figure 3.2.1.4

LGE Internal Use Only

- 59 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.1.4 Checking RF signal path (DPX)

1.950GHz

START

3. TROUBLE SHOOTING

Check TP1(C2039) at FL2001

Check if there is any major dierence referring

To Figure 3.1.1(b) Is any signal detected at

that point?

Yes

Is any signal detected at that point?

Yes

DPX is OK. See next page to check PAM

No

No

Check C2038

Replace FL2001

LGE Internal Use Only

Figure 3.1.1 (b)

- 60 -

TP1

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

FL2001

DPX

3. TROUBLE SHOOTING

TP1

TRX B1

TX_MODULE_TRX_1

<Main Top>

W-BAND DPX

B1

B2

4.7pC2038

L2003

2p

3nC2039

TP1

EAM62692801(B5897)

EAM62890101(B8613)

L2010

DNI

FL2001

ANT

GND1 GND6

GND2 GND5

GND3 GND4

B1

C2037

16

RX

3

TX

92

84

75

100p

L2011

DNI

LGE Internal Use Only

- 61 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.1.5 Checking RF signal path (Tx Module)

START

3. TROUBLE SHOOTING

Check TP1(C1002) at U1000

Check if there is any major dierence referring

To Figure 3.1.1(b). Is any signal detected at that

point?

Yes

Check TP2(C2038) at FL2001

Check if there is any major dierence referring

To Figure 3.1.1(c). Is any signal detected at that

point?

Yes

Is any signal detected at that point?

No

No

No

Check L1001,C1001, L1000, SW1001

Check TP3(C1023),TP4(C1024),TP5(C1019),

TP6(C1020) at U1000. Is any DC signal detected

at that points?

Yes

Replace U1000

Check C2038

No

TX module is OK. See next page to check DPX

LGE Internal Use Only

Yes

The Problem may be Logic part

Refer to Logic troubleshoot

- 62 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP5

3. TROUBLE SHOOTING

TP4

TP6

SW1000

G1

SKY77573-31

TP1

ANTG2

(U1000)

TP3

TP2

<Main Top>

1nC1000

SW1001

ANT COMMON

G3 G4

43

21

C1001 3.3n

L1000

27n

L1001

0.5p

C1002

1n

TP1

LGE Internal Use Only

- 63 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

Boost Option

+VPWR_BOOST_BYP

GND15

22

GND16

23

C1013

4.7u

TRX1

24

GND17

25

TRX2

26

GND18

27

TRX3

28

GND19

29

TRX4

30

GND20

31

VBATT

32

NC1

33

TX_MODULE_TRX_1

TX_MODULE_TRX_2

TX_MODULE_TRX_4

C1112

22p

TP3

ANT0_SW_SEL_0

DNI

R1006

SPDT_SEL

C1113

100p

100p

C1023

C1024

100p

100p

R1004

WTR_TX1_OUT PA0_R_0

C1060

0

DNI

R1005

21

20

RX2

SPDT_OUT

SKY77573-31

NC2

34

TP4

19

18

RX1

SPDT_IN

U1000

RF_IN36SPDT35SW038SW1

37

TP5

16

GND1417GND13

HB_EN

39

13

14

15

ANT

GND12

GND11

GND10

GND9
GND8
GND7
GND6
GND5

GND4

VCC2
VCC1

GND3

GND2

GND1

LB_EN40MODE041MODE142PGND

43

TP6

C1019 100p

100p

C1020

12

11

10

9

8

7

6

5

4

3

2

1

C1015

100p

Boost Option

C1017

C1016

10n

4.7u

PA0_R_1

ANT0_SW_SEL_3
ANT0_SW_SEL_2ANT0_SW_SEL_1

100p

100p

C1022

C1021

W-BAND DPX

B1

B2

EAM62692801(B5897)

EAM62890101(B8613)

TRX B1

FL2001

ANT

GND1 GND6

GND2 GND5

GND3 GND4

16

RX

3

TX

92

84

75

TX_MODULE_TRX_1

TP2

4.7pC2038

L2003

2p

3nC2039

L2010

DNI

+VPWR_BOOST_BYP

B1

C2037

100p

L2011

DNI

LGE Internal Use Only

- 64 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

1.950GHz

1.950GHz

TP1

3. TROUBLE SHOOTING

Figure 3.1.1 (b)

Figure 3.1.1 (c)

TP2

LGE Internal Use Only

- 65 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.2 WCDMA_B5 Tx

3. TROUBLE SHOOTING

START

WCDMA B5 Tx TEST SETUP

- Test Channel : 4182

- Sector Power : -55 dBm

1. Check

DC Power Supply circuit

2. Check XO

3. Check PA

4. Check DPX

5. Check PAM

Re download S/W & Cal

* There are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form

LGE Internal Use Only

- 66 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

U2002

SKY77573­31 (U1000)

WTR2605

(U3000)

DPX

(FL2002)

<Main Top>

LGE Internal Use Only

- 67 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.2.1 Checking DC Power supply circuit

START

3. TROUBLE SHOOTING

Check TP1(C3001)

+2V05_VREG_L9 is OK?

Yes

Check TP2(C3007)

+1V225_VREG_L1 is OK?

Yes

Check TP3(C3016)

+1V8_VREG_L10 is OK?

Yes

No

The Problem may be Logic part

Refer to Logic troubleshoot

No

The Problem may be Logic part

Refer to Logic troubleshoot

No

The Problem may be Logic part

Refer to Logic troubleshoot

DC Po wer su pply Circuit is OK. See next

LGE Internal Use Only

Page to check XO circuit

- 68 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : C3001

(+2V05_VREG_L9)

TP2: C3007

(+1V225_VREG_L1)

3. TROUBLE SHOOTING

TP3: C3016
(+1V8_VREG_L10)

WTR2605

(U3000)

+2V05_VREG_L9

Tuning point (Inductor Placeholder)

0

R3007

+1V225_VREG_L1

TP2

TP1

<Main Top>

C3001 4.7u

C3002 0.1u

C3003 0.1u

C3007

4.7u

0.1uC3004

0.1uF STAR ROUTE

C3005 0.1u

C3006

0.1u

10nL3001

0.1uC3010

0.1uC3009

0.1uC3011

STAR ROUTE

0.1uC3012

19

VDD_RF2_R_BB

16

VDD_RF2_T_DA

37

VDD_RF2_T_VCO

52

VDD_RF2_T_PLL

40

VDD_RF2_R_PLL

54

VDD_RF2_XO

39

VDD_RF1_R_VCO

46

VDD_RF1_T_PLL

26

VDD_RF1_T_LO

30

VDD_RF1_R_LO

20

VDD_RF1_LNA

48

VDD_RF1_DIG

31

VDD_RF1_G_LO

21

VDD_RF1_G_PLL

59

VDD_RF3_IO

U3000

+1V8_VREG_L10

LGE Internal Use Only

TP3

C3016 0.1u

- 69 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.2.2 Checking WTR2605 XO circuit

START

3. TROUBLE SHOOTING

Check TP1(R3005)

Is it 19.2MHz?

No

Replace X4100 and then check

TP1(R3005)

Is it similar ?

No

Replace Main B/D

Yes

Yes

XO circuit is Ok. See next page

to check RF signal path

XO circuit is Ok. See next page

to check RF signal path

LGE Internal Use Only

- 70 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : R3005
(WTR_XO_IN)

3. TROUBLE SHOOTING

WTR2605

(U3000)

U3000

RX_BB_IP

RX_BB_IM

RX_BB_QP

RX_BB_QM

XO_IN

GNSS_BB_IP

GNSS_BB_IM

GNSS_BB_QP

GNSS_BB_QM

61
55
49
43
60
62
51
45
41

<Main Top>

100pC3008 R3005 0

TP1

WTR0_PRXBB_I_P
WTR0_PRXBB_I_N
WTR0_PRXBB_Q_P
WTR0_PRXBB_Q_N
WTR_XO_IN
WTR0_GNSSBB_I_P
WTR0_GNSSBB_I_N
WTR0_GNSSBB_Q_P
WTR0_GNSSBB_Q_N

WTR_XO_IN

C3013

DNI

WTR0_XO_IN

LGE Internal Use Only

- 71 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.2.3 Checking B5 TX PA

START

3. TROUBLE SHOOTING

Check TP1(C2043) at U2002

Check if there is any major dierence referring

To Figure 3.2.1.4 Is it similar ?

Yes

Check TP2(L2006)at U2002

Check if there is any major dierence referring

To Figure 3.2.1.4 Is it similar ?

No

Check TP3(C2034) at U2002 (VPWR)

Whether it is higher than 1.5V

Yes

No

Check C172

Yes

PAM circuits OK, See next page

No

The Problem may be Logic part

Refer to Logic troubleshoot

LGE Internal Use Only

Replace U1004

- 72 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP3(+VPWR)

TP2(RF OUT)

3. TROUBLE SHOOTING

TP1(RF IN)

<Main Top>

LGE Internal Use Only

- 73 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

+VPWR_BOOST_BYP

TP3(+VPWR)

C2036

C2034

1n

10u

CPL_IN_OUT

14

17

15

3. TROUBLE SHOOTING

+VPWR_BOOST_BYP

C2031

C2033

10u

1n

16

1

C2041

C2045

5.6n

B5(G850)

C2055

L2005

0.5p

TP2(RF OUT)

GND6

PGND

CPLIN

VBATT

GND5
VCC
GND4

RFOUTHB

U2002

SKY77742-21

CPLOUT

GND2

GND3

9

2

RFIN

VENHB

4

VENLB

VMODERFOUTLB

C2048

C2047

100p

GND1

6

738

100p

C2049

100p

PA0_ON_1
PA0_ON_2

PA0_R_0

2.2p

C2046

12n

13
12
11
10 5

Place matching components near WTR

C2043 100p

B1
B8

C2044

DNI

TP1(RF IN)

WTR_TX3_OUT

B1,B8

WTR_PDET_IN

3.9n

L2006
DNI

LGE Internal Use Only

- 74 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Center Frequency :

836.4MHz

Center Frequency :

836.4 MHz

TP1

3. TROUBLE SHOOTING

Figure 3.2.1.4

TP2

LGE Internal Use Only

- 75 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Center Frequency :

836.4MHz

3.2.2.4 Checking RF signal path (DPX)

START

3. TROUBLE SHOOTING

Check TP1(C2051) at FL2002

Check if there is any major dierence referring

To Figure 3.1.1(b) Is any signal detected at

that point?

Yes

Is any signal detected at that point?

Yes

DPX is OK. See next page to check PAM

No

No

Check C2051, L2004, C2050

Replace FL2002

LGE Internal Use Only

Figure 3.1.1 (b)

- 76 -

TP1

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

FL2002

DPX

3. TROUBLE SHOOTING

TP1

<Main Top>

FL2002

6

TX_MODULE_TRX_4 WTR_PRX_LB_1_IN

L2004

TP1

6.8n

ANT

GND12GND6

GND24GND5

GND35GND4

1

RX

3

TX

9

8

7

100pC2052C2051 100p100pC2050

C2053 18n

L2007

DNI

LGE Internal Use Only

- 77 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.2.2.5 Checking RF signal path (PAM)

START

3. TROUBLE SHOOTING

Check TP1(C1002) at U1000

Check if there is any major dierence referring

To Figure 3.1.1(b). Is any signal detected at that

point?

Yes

Check TP2(C2038) at FL2001

Check if there is any major dierence referring

To Figure 3.1.1(c). Is any signal detected at that

point?

Yes

Is any signal detected at that point?

No

No

No

Check L1001,C1001, L1000, SW1001

Check TP3(C1023),TP4(C1024),TP5(C1019),

TP6(C1020) at U1000. Is any DC signal detected

at that points?

Yes

Replace U1000

Check C2038

No

TX module is OK. See next page to check DPX

LGE Internal Use Only

Yes

The Problem may be Logic part

Refer to Logic troubleshoot

- 78 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP5

3. TROUBLE SHOOTING

TP4

TP6

SW1000

G1

SKY77573-31

TP1

ANTG2

(U1000)

TP3

TP2

<Main Top>

1nC1000

SW1001

ANT COMMON

G3 G4

43

21

C1001 3.3n

L1000

27n

L1001

0.5p

C1002

1n

TP1

LGE Internal Use Only

- 79 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

Boost Option

+VPWR_BOOST_BYP

GND15

22

GND16

23

C1013

4.7u

TRX1

24

GND17

25

TRX2

26

GND18

27

TRX3

28

GND19

29

TRX4

30

GND20

31

VBATT

32

NC1

33

TX_MODULE_TRX_1

TX_MODULE_TRX_2

TX_MODULE_TRX_4

C1112

22p

TP3

ANT0_SW_SEL_0

DNI

R1006

SPDT_SEL

C1113

100p

100p

C1023

C1024

100p

100p

R1004

WTR_TX1_OUT PA0_R_0

C1060

0

DNI

R1005

21

20

RX2

SPDT_OUT

SKY77573-31

NC2

34

TP4

19

18

RX1

SPDT_IN

U1000

RF_IN36SPDT35SW038SW1

37

TP5

16

GND1417GND13

HB_EN

39

13

14

15

ANT

GND12

GND11

GND10

GND9
GND8
GND7
GND6
GND5

GND4

VCC2
VCC1

GND3

GND2

GND1

LB_EN40MODE041MODE142PGND

43

TP6

C1019 100p

100p

C1020

12

11

10

9

8

7

6

5

4

3

2

1

C1015

100p

Boost Option

C1017

C1016

10n

4.7u

PA0_R_1

ANT0_SW_SEL_3
ANT0_SW_SEL_2ANT0_SW_SEL_1

100p

100p

C1022

C1021

W-BAND DPX

B1

B2

EAM62692801(B5897)

EAM62890101(B8613)

TRX B1

FL2001

ANT

GND1 GND6

GND2 GND5

GND3 GND4

16

RX

3

TX

92

84

75

TX_MODULE_TRX_1

TP2

4.7pC2038

L2003

2p

3nC2039

L2010

DNI

+VPWR_BOOST_BYP

B1

C2037

100p

L2011

DNI

LGE Internal Use Only

- 80 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 3.1.1 (b)

Center Frequency :

836.4MHz

Center Frequency :

836.4MHz

3. TROUBLE SHOOTING

TP1

TP2

Figure 3.1.1 (c)

LGE Internal Use Only

- 81 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3 GSM Rx Part Troubleshooting

3.3.1 GSM850 Rx

Rx TEST SETUP

- BCH : GSM850

- TCH : GSM850

- Channel : 190

- Sector Power : -30 dBm

3. TROUBLE SHOOTING

START

1. Check

DC Power Supply circuit

2. Check WTR2605 XO

3. Check RF Signal path

Re download S/W & Cal

* There are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form

LGE Internal Use Only

- 82 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

WTR2605

(U3000)

3. TROUBLE SHOOTING

SKY77573­31 (U1000)

DPX

(FL2002)

<Main Top>

LGE Internal Use Only

- 83 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.1.1 Checking DC Power supply circuit

START

3. TROUBLE SHOOTING

Check TP1(C3001)

+2V05_VREG_L9 is OK?

Yes

Check TP2(C3007)

+1V225_VREG_L1 is OK?

Yes

Check TP3(C3016)

+1V8_VREG_L10 is OK?

Yes

No

No

No

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

DC Po wer su pply Circuit is OK. See next Page

LGE Internal Use Only

to check XO circuit

- 84 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : C3001

(+2V05_VREG_L9)

TP2: C3007

(+1V225_VREG_L1)

3. TROUBLE SHOOTING

TP3: C3016
(+1V8_VREG_L10)

WTR2605

(U3000)

+2V05_VREG_L9

Tuning point (Inductor Placeholder)

0

R3007

+1V225_VREG_L1

TP2

TP1

<Main Top>

C3001 4.7u

C3002 0.1u

C3003 0.1u

C3007

4.7u

0.1uC3004

0.1uF STAR ROUTE

C3005 0.1u

C3006

0.1u

10nL3001

0.1uC3010

0.1uC3009

0.1uC3011

STAR ROUTE

0.1uC3012

19

VDD_RF2_R_BB

16

VDD_RF2_T_DA

37

VDD_RF2_T_VCO

52

VDD_RF2_T_PLL

40

VDD_RF2_R_PLL

54

VDD_RF2_XO

39

VDD_RF1_R_VCO

46

VDD_RF1_T_PLL

26

VDD_RF1_T_LO

30

VDD_RF1_R_LO

20

VDD_RF1_LNA

48

VDD_RF1_DIG

31

VDD_RF1_G_LO

21

VDD_RF1_G_PLL

59

VDD_RF3_IO

U3000

+1V8_VREG_L10

LGE Internal Use Only

TP3

C3016 0.1u

- 85 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.1.2 Checking WTR2605 XO circuit

START

3. TROUBLE SHOOTING

Check TP1(R3005)

Is it 19.2MHz?

No

Replace X4100 and then check

TP1(R3005)

Is it similar ?

No

Replace Main B/D

Yes

Yes

XO circuit is Ok. See next page

to check RF signal path

XO circuit is Ok. See next page

to check RF signal path

LGE Internal Use Only

- 86 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : R3005
(WTR_XO_IN)

3. TROUBLE SHOOTING

WTR2605

(U3000)

U3000

RX_BB_IP

RX_BB_IM

RX_BB_QP

RX_BB_QM

XO_IN

GNSS_BB_IP

GNSS_BB_IM

GNSS_BB_QP

GNSS_BB_QM

61
55
49
43
60
62
51
45
41

<Main Top>

100pC3008 R3005 0

TP1

WTR0_PRXBB_I_P
WTR0_PRXBB_I_N
WTR0_PRXBB_Q_P
WTR0_PRXBB_Q_N
WTR_XO_IN
WTR0_GNSSBB_I_P
WTR0_GNSSBB_I_N
WTR0_GNSSBB_Q_P
WTR0_GNSSBB_Q_N

WTR_XO_IN

C3013

DNI

WTR0_XO_IN

LGE Internal Use Only

- 87 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.1.3 Checking RF signal path (PAM)

START

3. TROUBLE SHOOTING

Check TP1(C1002) at U1000

Check if there is any major dierence referring

To Figure 3.1.1(b). Is any signal detected at that

point?

Yes

Check TP2(C2050) at FL2002

Check if there is any major dierence referring

To Figure 3.1.1(c). Is any signal detected at that

point?

Yes

Is any signal detected at that point?

No

No

No

Check L1001,C1001, L1000, SW1001

Check TP3(C1023),TP4(C1024),TP5(C1019),

TP6(C1020) at U1000. Is any DC signal detected

at that points?

Yes

Replace U1000

Check C2050

No

TX module is OK. See next page to check DPX

LGE Internal Use Only

Yes

The Problem may be Logic part

Refer to Logic troubleshoot

- 88 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP5

3. TROUBLE SHOOTING

TP4

TP6

SW1000

G1

SKY77573-31

TP1

ANTG2

(U1000)

TP3

TP2

<Main Top>

1nC1000

SW1001

ANT COMMON

G3 G4

43

21

C1001 3.3n

L1000

27n

L1001

0.5p

C1002

1n

TP1

LGE Internal Use Only

- 89 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3. TROUBLE SHOOTING

Boost Option

+VPWR_BOOST_BYP

GND15

22

GND16

23

C1013

4.7u

TRX1

24

GND17

25

TRX2

26

GND18

27

TRX3

28

GND19

29

TRX4

30

GND20

31

VBATT

32

NC1

33

TX_MODULE_TRX_1

TX_MODULE_TRX_2

TX_MODULE_TRX_4

C1112

22p

TP3

ANT0_SW_SEL_0

DNI

R1006

TP2

SPDT_SEL

L2004

6.8n

C1113

100p

C1023

100p

C1024

100p

FL2002

6

ANT

GND12GND6

GND24GND5

GND35GND4

100p

R1004

WTR_TX1_OUT PA0_R_0

C1060

0

DNI

R1005

TX_MODULE_TRX_4 WTR_PRX_LB_1_IN

21

20

RX2

SPDT_OUT

SKY77573-31

NC2

34

TP4

19

18

RX1

SPDT_IN

U1000

RF_IN36SPDT35SW038SW1

37

TP5

RX

TX

16

GND1417GND13

HB_EN

39

1

3

9

8

7

13

14

15

ANT

GND12

GND11

GND10

GND9
GND8
GND7
GND6
GND5

GND4

VCC2
VCC1

GND3

GND2

GND1

LB_EN40MODE041MODE142PGND

43

TP6

C1019 100p

100p

C1020

12

11

10

9

8

7

6

5

4

3

2

1

C1015

100p

Boost Option

C1017

C1016

10n

4.7u

+VPWR_BOOST_BYP

PA0_R_1

ANT0_SW_SEL_3
ANT0_SW_SEL_2ANT0_SW_SEL_1

100p

100p

C1022

C1021

100pC2052C2051 100p100pC2050

C2053 18n

L2007

DNI

LGE Internal Use Only

- 90 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Center Frequency :

881.4MHz

Center Frequency :

881.4MHz

TP1

3. TROUBLE SHOOTING

Figure 3.1.1 (b)

Figure 3.1.1 (c)

TP2

LGE Internal Use Only

- 91 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Center Frequency :

881.4MHz

3.3.1.4 Checking RF Signal Path (Duplexer)

START

3. TROUBLE SHOOTING

Check TP1(C2052) at FL2002

Check if there is any major dierence referring

To Figure 3.1.1(b) Is any signal detected at

that point?

Yes

Is any signal detected at that point?

Yes

All GSM850 Rx check is complete.

If the phone sill do not work ,replace main board

No

No

Check C2052, C2053

Replace FL2002

LGE Internal Use Only

Figure 3.1.1 (b)

- 92 -

TP1

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

FL2002

DPX

3. TROUBLE SHOOTING

TP1

<Main Top>

FL2002

6

TX_MODULE_TRX_4 WTR_PRX_LB_1_IN

L2004

6.8n

ANT

GND12GND6

GND24GND5

GND35GND4

1

RX

3

TX

9

8

7

100pC2052C2051 100p100pC2050

TP2

C2053 18n

L2007

DNI

LGE Internal Use Only

- 93 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.2 GSM900 Rx

3. TROUBLE SHOOTING

START

Rx TEST SETUP

- BCH : EGSM for GSM900

- TCH : EGSM for GSM900

- Channel : 37

- Sector Power : -30 dBm

1. Check

DC Power Supply circuit

2. Check WTR2605 XO

3. Check RF Signal path

Re download S/W & Cal

* There are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form

LGE Internal Use Only

- 94 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

WTR2605

(U3000)

3. TROUBLE SHOOTING

SKY77573­31 (U1000)

SAW Filter

(FL1001)

<Main Top>

LGE Internal Use Only

- 95 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.2.1 Checking DC Power supply circuit

START

3. TROUBLE SHOOTING

Check TP1(C3001)

+2V05_VREG_L9 is OK?

Yes

Check TP2(C3007)

+1V225_VREG_L1 is OK?

Yes

Check TP3(C3016)

+1V8_VREG_L10 is OK?

Yes

No

No

No

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

DC Po wer su pply Circuit is OK. See next Page

LGE Internal Use Only

to check XO circuit

- 96 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : C3001

(+2V05_VREG_L9)

TP2: C3007

(+1V225_VREG_L1)

3. TROUBLE SHOOTING

TP3: C3016
(+1V8_VREG_L10)

WTR2605

(U3000)

+2V05_VREG_L9

Tuning point (Inductor Placeholder)

0

R3007

+1V225_VREG_L1

TP2

TP1

<Main Top>

C3001 4.7u

C3002 0.1u

C3003 0.1u

C3007

4.7u

0.1uC3004

0.1uF STAR ROUTE

C3005 0.1u

C3006

0.1u

10nL3001

0.1uC3010

0.1uC3009

0.1uC3011

STAR ROUTE

0.1uC3012

19

VDD_RF2_R_BB

16

VDD_RF2_T_DA

37

VDD_RF2_T_VCO

52

VDD_RF2_T_PLL

40

VDD_RF2_R_PLL

54

VDD_RF2_XO

39

VDD_RF1_R_VCO

46

VDD_RF1_T_PLL

26

VDD_RF1_T_LO

30

VDD_RF1_R_LO

20

VDD_RF1_LNA

48

VDD_RF1_DIG

31

VDD_RF1_G_LO

21

VDD_RF1_G_PLL

59

VDD_RF3_IO

U3000

+1V8_VREG_L10

LGE Internal Use Only

TP3

C3016 0.1u

- 97 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.2.2 Checking WTR2605 XO circuit

START

3. TROUBLE SHOOTING

Check TP1(R3005)

Is it 19.2MHz?

No

Replace X4100 and then check

TP1(R3005)

Is it similar ?

No

Replace Main B/D

Yes

Yes

XO circuit is Ok. See next page

to check RF signal path

XO circuit is Ok. See next page

to check RF signal path

LGE Internal Use Only

- 98 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1 : R3005
(WTR_XO_IN)

3. TROUBLE SHOOTING

WTR2605

(U3000)

U3000

RX_BB_IP

RX_BB_IM

RX_BB_QP

RX_BB_QM

XO_IN

GNSS_BB_IP

GNSS_BB_IM

GNSS_BB_QP

GNSS_BB_QM

61
55
49
43
60
62
51
45
41

<Main Top>

100pC3008 R3005 0

TP1

WTR0_PRXBB_I_P
WTR0_PRXBB_I_N
WTR0_PRXBB_Q_P
WTR0_PRXBB_Q_N
WTR_XO_IN
WTR0_GNSSBB_I_P
WTR0_GNSSBB_I_N
WTR0_GNSSBB_Q_P
WTR0_GNSSBB_Q_N

WTR_XO_IN

C3013

DNI

WTR0_XO_IN

LGE Internal Use Only

- 99 -

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes

3.3.2.3 Checking RF Signal Path (Tx Module)

START

3. TROUBLE SHOOTING

Check TP1(C1002) at U1000

Check if there is any major dierence referring

To Figure 3.1.1(b). Is any signal detected at that

point?

Yes

Check TP2(C1011) at FL1001

Check if there is any major dierence referring

To Figure 3.1.1(c). Is any signal detected at that

point?

Yes

Is any signal detected at that point?

No

No

No

Check L1001,C1001, L1000, SW1001

Check TP3(C1023),TP4(C1024),TP5(C1019),

TP6(C1020) at U1000. Is any DC signal detected

at that points?

Yes

Replace U1000

Check C1011

No

TX module is OK. See next page to check Saw Filter

LGE Internal Use Only

Yes

- 100 -

The Problem may be Logic part

Refer to Logic troubleshoot

Copyright © 2014 LG Electronics. Inc. All right reserved.

Only for training and service purposes