Lg Sj7 User manual

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”

IN THIS MANUAL.

CONFIDENTIAL

MODEL: SJ7 (SJ7, SJ7-C, SPJ8B-W)

P/NO : AFN78037574 JULY, 2017

MODEL: SJ7

(SJ7, SJ7-C, SPJ8B-W)

Only for training and service purposes.

Wireless Sound Bar

1-1

Only for training and service purposes.

CONTENTS

SECTION 1 ........ GENERAL

SECTION 2 ........ CABINET & MAIN CHASSIS

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ WIRELESS SUBWOOFER PART

1-2

Only for training and service purposes.

SECTION 1

GENERAL

CONTENTS

ESD PRECAUTIONS......................................................................................................................................... 1-3

NAME OF EACH COMPONENT ....................................................................................................................... 1-4

PAIRING GUIDE ................................................................................................................................................ 1-5

SECONDARY UNIT CONNECTION.................................................................................................................. 1-6

WIRELESS SUBWOOFER CONNECTION....................................................................................................... 1-7

HIDDEN KEY MODE ......................................................................................................................................... 1-8

FIRMWARE UPDATE GUIDE ........................................................................................................................... 1-9

SPECIFICATIONS ........................................................................................................................................... 1-14

1-3

Only for training and service purposes.

ESD PRECAUTIONS

Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated

circuits and some field-effect transistors and semiconductor chip components. The following techniques should

be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off

any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a

commercially available discharging wrist strap device, which should be removed for potential shock reasons

prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface

such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can

generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD

devices.

6. Do not remove a replacement ESD device from its protective package until immediately before you are

ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by

conductive foam, aluminum foil or comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the

protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER

SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion

such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate

static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS

INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED

“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF

ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE

SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE

LITERATURE.

1-4

Only for training and service purposes.

NAME OF EACH COMPONENT

• Front/Side panel

• Rear Panel

Ao/p"atqzrj-:Liozxyx{tqzrjqj{jq

F"Qzshynts-:^jqjhyxymjkzshyntsfsinsuzy

xtzwhj/

1(Standby)

BT"[qf~&[fzxj-:

- ^yfwyxtwufzxjxuqf~gfhpnsymjBluetooth

kzshynts/"^Z`YOML]tw]PL]zxfljrtij-

- ^yfwyxtwufzxjxuqf~gfhptk^jhtsifw~zsny/

"[Z]_LMWPzxfljrtij-

- [wjxxytxjqjhyBluetoothkzshynts/

"^Z`YOML]tw]PL]zxfljrtij-

- [wjxxfsimtqiythtssjhyfstymjwMqzjyttym

ij{nhj/"[Z]_LMWPzxfljrtij-

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WPOnsinhfytw"NtssjhyntsWPO-

Onxuqf~|nsit|

AOPTICAL IN : Zuynhfqnsuzy

USB (SERVICE ONLY) : ^&bit|sqtfi

htssjhytw

DC IN : LNfifuyjwnsuzy

BHDMI IN / OUT (TV ARC) : SOXTnsuzy&tzyuzy/

C`xfljXtij^|nyhm : ^jqjhyxzxfljrtij/

DDC IN : LNfifuyjwnsuzy

USB (SERVICE ONLY) : ^&bit|sqtfi

htssjhytw

PAIRING : Ntssjhyx[wnrfw~zsnyfsi^jhtsifw~

zsny/"]PL]0^Z`YOML]zxfljrtijtsq~-

EBattery LED

[wnrfw~zsny ^jhtsifw~zsny

1-5

Only for training and service purposes.

How to pairing in a store

When you displaying several SET in the store not one SET, you should turn on the SET one by one.

If not, it can be paired with other SET. If you did but SET paired with other SET, please following below step.

1) Turn off all set except the set to be paired.

2) Turn off the Primary unit to be paired.

3) Turn on the Secondary unit to be paired.

4) Press PAIRING button on the rear of the Secondary unit.

The white LED on the front of Secondary unit blinks.

5) Turn on the Primary unit to be paired.

6) If Pairing is completed. The white LED on the front of Secondary unit turns on.

7) Pair other SETS in the same way.

PAIRING GUIDE

1-6

Only for training and service purposes.

SECONDARY UNIT CONNECTION

LED indicator of Secondary unit

You can check the connected status of Primary unit

and Secondary unit by LED indicator of Secondary

unit.

LED Color Status

White (Blink)

Attempting to make connection.

White The connection is completed.

Red

The Secondary unit is in

standby mode or the connection

is failed.

Connecting the Primary unit and

Secondary unit

1. Connect the power cord to the Primary unit and

plug the power cord into a power outlet.

2. Turn on the Primary unit by pressing .

3. Turn on the Secondary unit by switching the

Usage Mode Switch to REAR or SOUND BAR.

4. The Primary unit and Secondary unit will be

automatically connected.

- When this unit is successfully connected,

SOUND BAR or REAR appears in the display

window of Primary unit.

- White LED on the front of Secondary unit turns on.

Note

If the connection is failed or disconnected, the LED

indicator turns on red.

Manually pairing Secondary unit

When the pairing operate abnormally, you can check

red LED on the Secondary unit and the Secondary

unit does not make sound. To solve the problem,

follow the steps below.

1. Turn off the Primary unit.

Press PAIRING button on the rear of the Secondary

unit.

- The white LED on the front of the Secondary unit

blinks.

3. Turn on the Primary unit.

4. Pairing is completed.

- The white LED on the front of the Secondary unit

turns on.

Note

•It takes a few seconds (and may take longer) for the

Primary unit and the Secondary unit.

to communicate

with each other and make sounds.

•The closer the Primary unit and the Secondary unit.,

the better sound quality. It is recommended to install

the Primary unit and the Secondary unit as close as

possible and avoid the cases below.

- There is an obstacle between the Primary unit and

the Secondary unit.

- There is an device using same frequency with this

wireless connection such as a medical equipment,

a microwave or a wireless LAN device.

- Keep the Primary unit and Secondary unit away

from the device (ex. wireless router, microwave

oven, etc.) over 1m (3 feet). to prevent wireless

interference.

1-7

Only for training and service purposes.

WIRELESS SUBWOOFER CONNECTION

LED indicator of wireless subwoofer

LED Color Status

Green (Blink)

Attempting to make connection.

Green The connection is completed.

Red

The wireless subwoofer is in

standby mode or the connection

is failed.

Off (No display)

The power cord of wireless

subwoofer is disconnected.

Setting up the wireless subwoofer for the

ﬁrst time

1. Connect the power cord to the subwoofer and plug

the power cord into a power outlet.

Turn on the Primary unit : The sound bar and wireless

subwoofer will be automatically connected.

Green LED on the rear of wireless subwoofer turns on.

Manually pairing wireless subwoofer

When your connection is not completed, you can

check red LED on the wireless subwoofer and the

wireless subwoofer does not make sound. To solve

the problem, follow the steps below.

1. Press Pairing button on the rear of the wireless

subwoofer.

The green LED on the rear of the wireless subwoofer

blinks quickly.

2. Turn on the Primary unit.

3. Pairing is completed.

The green LED on the rear of the wireless subwoofer

turns on.

Note

•It takes a few seconds (and may take longer) for the

Primary unit and the subwoofer to communicate with

each other and make sounds.

•The closer the Primary unit and the subwoofer, the

better sound quality. It is recommended to install the

Primary unit and the subwoofer as close as possible

and avoid the cases below.

- There is an obstacle between the Primary unit and

the subwoofer.

- There is an device using same frequency with this

wireless connection such as a medical equipment,

a microwave or a wireless LAN device.

- Keep the sound bar and the subwoofer away from

the device (ex. wireless router, microwave oven,

etc.) over 1m (3 feet). to prevent wireless interference.

1-8

Only for training and service purposes.

Unit HIDDEN MODE KEYS

Primary

VERSION CHECK

Primary unit ‘Volume -’ + Remote control ‘Play/Pause’ for more than 3 seconds.

Next : Forward Skip / Previous : Backward Skip

Exit : Power off

Initialize Primary unit ‘Volume -’ + Remote control ‘SOUND EFFECT’ for more than 3 seconds.

Display window : “E-CLR”

Demo Mode (Play) Enter : Primary unit ‘F’ (Function) for 5 seconds.

Exit : Primary unit ‘F’ (Function) for 5 seconds.

Wireless Factory Primary unit “MIN” (volume minimum state) + Remote control ‘(Mute)’ for about 3 seconds.

Display window : “SUB-WF RESET”

USB Mode Primary unit ‘Volume -’ + Remote control ‘Volume +’ for more than 3 seconds.

Secondary

Initial & Version Check

Install BT_version_check_1.03_160825.apk Android phone.

Start Version Check App. It’s able to Version Check and initialized.

Move switch to Off Mode in Power plug out condition.

Wireless Factory Press PAIRING button on the rear of the Secondary unit.

Front LED : Blink with white color

USB Mode

Plug in the power cord and connect the power cord to Secondary unit.

Turn on the Secondary unit by switching the usage mode switch to SOUND BAR.

Press “PLAY/PAUSE” key for 3secs to change USB function.

Battery LED : Blink with amber color

HIDDEN KEY MODE

1-9

Only for training and service purposes.

FIRMWARE UPDATE GUIDE

1. Preparation

1) SJ7 Units (Primary Unit, Secondary Unit,

Wireless Subwoofer Unit)

2) SJ7 RCU

3) USB Memory

4) Android Device with “Version Check APP”

If any module of primary unit is updated

If any module of secondary unit is updated

If wireless subwoofer rx module of primary unit

is updated

<RCU>

If any module of primary unit is updated

Necessary

“Version Check APP” must be installed

If any module of secondary unit is updated

Caution

•Take care not to power off during update

•Do format USB memory before update

(FAT32 ﬁle system)

1-10

Only for training and service purposes.

2. Primary unit update

Step 1. Prepare SJ7 primary update binaries.

Update module Preﬁx & Extension Filename Sample

B/E DSP_MAIN_SJ7*.ROM DSP_MAIN_SJ7_1701230.ROM

Micom MICOM_SJ7*.HEX MICOM_SJ7_1701200_1933_

rev3022.HEX

BT BT_SJ7*.BIN BT_SJ7_V2.5.23_20170122.BIN

Wireless

Subwoofer Tx WIRELESS_TX*.BIN

WIRELESS_TX_SJ7_161227R_

Ver170108_checksum_6EBA_

DV2.BIN

Wireless

Subwoofer Rx WIRELESS_RX*.BIN

WIRELESS_RX_LG 0.1CH

IA9Q RX_V171203@

SJ8,6,5,4,3_20161027001_

CHECKSUM_652B.BIN

Wireless

Rear Tx

WIRELESS_MASTER_

TX*.BIN

WIRELESS_MASTER_TX_

SJ7_161219_Ver172012_0x5090.

BIN

MEQ MEQ*.BIN MEQ_SJ7_161221B0.BIN

PEQ EQ_PRG*.BIN EQ_PRG_SJ7_

MASTER_170123_0_7C33.BIN

Option OPT*.BIN OPTION_SJ7.BIN

Step 2. Copy all updated SJ7 primary binaries to

USB memory.

Step 3. Power on SJ7 primary unit.

Step 4. Press “USB Function” hidden key to change

function to USB.

• USB Function Hidden Key : Press Set “Vol-” + RCU

“Vol+” for 3secs.

Step 5. If there is an updated wireless subwoofer rx

binary in update list, you need to pair between pri-

mary unit and subwoofer unit before start update.

Step 6. Verify the function has changed to USB with

VFD display.

Step 7. Attach USB which has update binaries to the

USB slot back of SJ7 primary unit.

Step 8. Update will start automatically.

Check VFD what module is in progress one by one.

Update module VFD display

B/E

Micom

Wireless Subwoofer Tx

Wireless Subwoofer Rx

Wireless Rear Tx

MEQ

PEQ

Option

•The numbers in VFD display of wireless modules

will increase in progress as progress percent from 00

to 100.

Step 9. SJ7 primary unit will be off automatically after

update ﬁnish.

Step 10. Power on SJ7 primary unit again.

USB

D-UP

OP-UP

EQ-UP

MQ-UP

RT 00

WR 00

WT 00

BT-UP

M-UP

1-11

Only for training and service purposes.

Primary unit update

Step 11. Press “Version Check” hidden key to verify

whether the update was successfully completed or

not.

• Version Check Hidden Key : Press Set “Vol-” +

RCU “Play/Pause” for 3secs.

Step 12. SJ7 shows the version of all modules in the

order shown below. Compare the version VFD shows

and you updated.

The order that SJ7 primary shows version in

version check hidden mode

MICOM PEQ B/E MEQ 

Wireless Subwoofer Tx 

Wireless Subwoofer Rx BT 

Boot loader (do not mind) Wireless Rear Tx 

Option

1-12

Only for training and service purposes.

3. Secondary unit update

Step 1. Prepare SJ7 secondary update binaries.

Update module Preﬁx & Extension Filename Sample

DSP DSP_SJ7*.ROM DSP_SJ7_1701200.ROM

EQ EQ_PRG*.BIN Q_PRG_SJ7_SLAVE_170119_0_

A302.BIN

Wireless

Rear Rx

WIRELESS_SLAVE_

RX*.BIN

WIRELESS_SLAVE_RX_

SJ7_161227_Ver173013_0x82fc_

CHECKSUM_2B82.BIN

Step 2. Copy all updated SJ7 secondary binaries to

USB memory.

Step 3. Plug in the power cord and connect the power

cord to SJ7 secondary unit.

Step 4. Turn on the secondary unit by switching the

usage mode switch to SOUND BAR.

Step 5. Press “PLAY/PAUSE” key for 3secs to

change USB function.

Step 6. Battery LED blinks with amber color if USB

mode function change succeeded.

Step 7. Attach USB which has update binaries to the

USB slot back of SJ7 secondary unit.

Step 8. Battery LED blinks with green color while up-

date is in progress.

Step 9. SJ7 secondary unit will be off automatically

after update ﬁnish.

You can check it by battery LED is solid with red color.

Step 10. Turn on the secondary unit by switching the

usage mode switch to PORTABLE.

1-13

Only for training and service purposes.

Secondary unit update

Step 11. Verify whether the update was successfully

completed or not by “Version Check App”.

Connect between android device and SJ7 secondary

unit by “Version Check App” through BT.

Step 12. Compare the version “Version Check App”

shows and you updated.



How to reset wireless connections

Step 1. Power on SJ7 primary unit.

Step 2. Change the volume to MIN.

Step 3. Press RCU “MUTE” key for 3secs.

Step 4.

VFD scrolls “SUB-WF RESET” if wireless reset

was successfully completed.

It means that 2 wireless connections, “primary-secondary”,

“primary-subwoofer” have reset successfully.

SUB-W F RESET

1-14

Only for training and service purposes.

SPECIFICATIONS

• GENERAL

Power consumption Refer to the main label.

AC adapter Model : DA-38A25

Manufacturer : Asian Power Devices Inc.

Input : 100 - 240 V ~ 50 - 60 Hz 1.2 A

Output : 25 V 1.52 A

Dimensions (W x H x D)

Approx. 340 mm x 74 mm x 110 mm (13.4 inch x 2.9 inch x 4.3 inch)

With foot (In each of Primary unit and Secondary unit)

Operating temperature 5 °C to 35 °C

Operating humidity 5 % to 90 %

Available Digital Audio In Sampling

Frequency 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz

Available Digital Audio In format Dolby Audio, DTS Digital Surround, PCM

• INPUT/OUTPUT

OPTICAL IN (Digital audio in) 3 V (p-p), Optical jack x 1

HDMI IN 19 Pin (Type A, HDMI™ connector) x 1

HDMI OUT 19 Pin (Type A, HDMI™ connector) x 1

• BATTERY (Secondary unit)

Battery capacity 2,600 mAh

Operating time Approx. 4 hours .

It may vary depending on the battery status and operational conditions.

Charging time Less than 3 hours 40 minutes (with AC Adapter).

It can be varied depending on the conditions of the battery or operation.

• WIRELESS SUBWOOFER

Power requirements Refer to the main label on the wireless subwoofer.

Power consumption Refer to the main label on the wireless subwoofer.

Type 1 Way 1 Speaker

Impedance 3 Ω

Rated Input Power 160 W RMS

Max. Input Power 320 W RMS

Dimensions (W x H x D) Approx. 171 mm x 320 mm x 252 mm

• AMPLIFIER(RMS Output) SPECIFICATIONS

SOUND BAR usage mode

Total 320 W RMS

(140 W RMS : in state of disconnecting AC Adapter from Secondary unit)

Front 80 W RMS x 2 (8 Ωat 1 kHz, THD 10%)

(30 W RMS x 2 : in state of disconnecting AC Adapter from Secondary unit)

Subwoofer 160 W RMS (3 Ωat 80 Hz, THD 10%)

(80 W RMS : in state of disconnecting AC Adapter from Secondary unit)

REAR usage mode

Total 320 W RMS

(140 W RMS : in state of disconnecting AC Adapter from Secondary unit)

Front 80 W RMS x 1 (8 Ωat 1 kHz, THD 10%)

(30 W RMS x 1 : in state of disconnecting AC Adapter from Secondary unit)

Rear 80 W RMS x 1 (8 Ωat 1 kHz, THD 10%)

(30 W RMS x 1 : in state of disconnecting AC Adapter from Secondary unit)

Subwoofer 160 W RMS (3 Ωat 80 Hz, THD 10%)

(80 W RMS : in state of disconnecting AC Adapter from Secondary unit)

1-15

Only for training and service purposes.

PORTABLE usage mode / OFF usage mode (Primary unit)

Total 160 W RMS

Front 80 W RMS x 1 (8 Ωat 1 kHz, THD 10%)

Subwoofer 80 W RMS (3 Ωat 80 Hz, THD 10%)

PORTABLE usage mode (Secondary unit)

Total 30 W RMS x 1 (8 Ωat 1 kHz, THD 10%)

• Designs and specifications are subject to change without prior notice.

1-16

Only for training and service purposes.

2-1

Only for training and service purposes.

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

DISASSEMBLY INSTRUCTIONS ..................................................................................................................... 2-2

1. HOW TO DISASSEMBLE THE PRIMARY UNIT...................................................................................... 2-2

2. HOW TO DISASSEMBLE THE SECONDARY UNIT ............................................................................... 2-7

3. HOW TO DISASSEMBLE THE SUBWOOFER...................................................................................... 2-12

EXPLODED VIEWS ......................................................................................................................................... 2-15

1. PRIMARY UNIT SECTION ..................................................................................................................... 2-15

2. SECONDARY UNIT SECTION............................................................................................................... 2-17

3. WIRELESS SUBWOOFER SECTION.................................................................................................... 2-19

4. PACKING ACCESSORY SECTION ....................................................................................................... 2-21