Lg Music flow sj8 User manual

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”

IN THIS MANUAL.

CONFIDENTIAL

MODEL: SJ8 (SJ8, SPJ8-W)

P/NO : AFN78212019 SEPTEMBER, 2017

MODEL: SJ8

(SJ8, SPJ8B-W)

Only for training and service purposes.

SMART Hi-Fi AUDIO

Wireless Multi-room Sound Bar

1-1

Only for training and service purposes.

CONTENTS

SECTION 1 ........ SUMMARY

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

SECTION 3 ........ ELECTRICAL

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

1-2

Only for training and service purposes.

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS.................................................... 1-3

SERVICING PRECAUTIONS ............................................................................................................................ 1-4

• GENERAL SERVICING PRECAUTIONS

• INSULATION CHECKING PRODEDURE

• ELECTROSTATICALLY SENSITIVE (ES) DEVICES

NAME OF EACH COMPONENT ....................................................................................................................... 1-5

WIRELESS SUBWOOFER CONNECTION....................................................................................................... 1-6

HIDDEN MODE.................................................................................................................................................. 1-7

SOFTWARE UPDATE GUIDE........................................................................................................................... 1-8

VERSION CHECK ........................................................................................................................................... 1-16

SPECIFICATIONS ........................................................................................................................................... 1-17

1-3

Only for training and service purposes.

PRODUCT SAFETY SERVICING GUIDELINES

FOR AUDIO PRODUCTS

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audio-video service

technicians.

When servicing this product, under no circumstances should the original design be

modified or altered without permission from LG Corporation. All components should

be replaced only with types identical to those in the original circuit and their physical

location, wiring and lead dress must conform to original layout upon completion of

repairs.

Special components are also used to prevent x-radiation, shock and fire hazard.

These components are indicated by the letter “x” included in their component des-

ignators and are required to maintain safe performance. No deviations are allowed

without prior approval by LG Corporation.

Circuit diagrams may occasionally differ from the actual circuit used. This way, imple-

mentation of the latest safety and performance improvement changes into the set is

not delayed until the new service literature is printed.

CAUTION : Do not attempt to modify this product in any way. Never perform cus-

tomized installations without manufacturer’s approval. Unauthorized modifications

will not only void the warranty, but may lead to property damage or user injury.

Service work should be performed only after you are thoroughly familiar with these

safety checks and servicing guidelines.

GRAPHIC SYMBOLS

The exclamation point within an equilateral triangle is intended to alert

the service personnel to important safety information in the service

literature.

The lightning flash with arrowhead symbol within an equilateral

triangle is intended to alert the service personnel to the presence of

noninsulated “dangerous voltage” that may be of sufficient magnitude

to constitute a risk of electric shock.

The pictorial representation of a fuse and its rating within an equilat-

eral triangle is intended to convey to the service personnel the follow-

ing fuse replacement caution notice:

CAUTION : FOR CONTINUED PROTECTION AGAINST RISK

OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND

RATING AS MARKED NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock. After

the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of adjacent com-

ponent shorts. This is especially important on items trans-ported to and from the

repair shop.

2. Verify that all protective devices such as insulators, barriers, covers, shields, strain

reliefs, power supply cords, and other hardware have been reinstalled per the

original design. Be sure that the safety purpose of the polarized line plug has not

been defeated.

3. Soldering must be inspected to discover possible cold solder joints, solder

splashes, or sharp solder points. Be certain to remove all loose foreign particles.

4. Check for physical evidence of damage or deterioration to parts and components,

for frayed leads or damaged insulation (including the AC cord), and replace if

necessary.

5. No lead or component should touch a high current device or a resistor rated at 1

watt or more. Lead tension around protruding metal surfaces must be avoided.

6. After reassembly of the set, always perform an AC leakage test on all exposed

metallic parts of the cabinet (the channel selector knobs, antenna terminals,

handle and screws) to be sure that set is safe to operate without danger of electri-

cal shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS

TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the

following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd

150V AC type capacitor between a known good earth ground water pipe, con-

duit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage

across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the

AC plug by using a non-polarized adaptor and repeat AC voltage measurements

for each exposed metallic part. Voltage measured must not exceed 0.75 volts

RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-

tutes a potential shock hazard and must be corrected immediately.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf

space over, or close to, a heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations where dew

is a factor, near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct venting. The customer should

also avoid the use of decorative scarves or other coverings that might obstruct

ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit must follow

the factory-approved mounting instructions. A product mounted to a shelf or plat-

form must retain its original feet (or the equivalent thickness in spacers) to provide

adequate air flow across the bottom. Bolts or screws used for fasteners must not

touch any parts or wiring. Perform leakage tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted

position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart.

Caution the customer on the hazards of trying to roll a cart with small casters

across thresholds or deep pile carpets.

7. Caution customers against using extension cords. Explain that a forest of exten-

sions, sprouting from a single outlet, can lead to disastrous consequences to

home and family.

1-4

Only for training and service purposes.

SERVICING PRECAUTIONS

CAUTION: Before servicing the

Audio products

covered by this

service data and its supplements and addends, read and fol-

low the SAFETY PRECAUTIONS.

NOTE: if unforeseen circumstances create conflict between

the following servicing precautions and any of the safety

precautions in this publication, always follow the safety pre-

cautions.

Remember Safety First :

General Servicing Precautions

1. Always unplug the

Audio products

AC power cord from the

AC power source before:

(1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnecting or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an electro-

lytic capacitor.

Caution: A wrong part substitution or incorrect polarity

installation of electrolytic capacitors may result in an

explosion hazard.

2. Do not spray chemicals on or near this

Audio products

or any

of its assemblies.

3. Unless specified otherwise in this service data, clean elec-

trical contacts by applying an appropriate contact cleaning

solution to the contacts with a pipe cleaner, cotton-tipped

swab, or comparable soft applicator.

Unless specified otherwise in this service data, lubrication

of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with

which instruments covered by this service manual might be

equipped.

5. Do not apply AC power to this

Audio products

and / or any

of its electrical assemblies unless all solid state device heat

sinks are correctly installed.

6. Always connect the test instrument ground lead to an

appropriate ground before connecting the test instrument

positive lead. Always remove the test instrument ground

lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn

the power on. Connect an insulation resistance meter (500V)

to the blades of the attachment plug. The insulation resis-

tance between each blade of the attachment plug and acces-

sible conductive parts (Note 1) should be more than 1Mohm.

Note 1: Accessible Conductive Parts include Metal panels,

Input terminals, Earphone jacks,etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged

easily by static electricity. Such components commonly are

called Electrostatically Sensitive (ES) Devices. Examples

of typical ES 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 compo-

nent or semiconductor-equipped assembly, drain off any

electrostatic charge on your body by touching a known

earth ground. Alternatively, obtain and wear a commer-

cially 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 ES

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

ES 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 ES devices.

5. Do not use freon-propelled chemicals. These can generate

an electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective

package until immediately before you are ready to install

it. (Most replacement ES devices are packaged with leads

electrically shorted together by conductive foam, aluminum

foil, or comparable conductive material).

7. Immediately before removing the protective material from

the leads of a replacement ES device, touch the protective

material to the chassis or circuit assembly into which the

device will be installed.

Caution: Be sure no power is applied to the chassis or cir-

cuit, and observe all other safety precautions.

8.Minimize bodily motions when handling unpackaged

replacement ES devices. (Normally harmless motion such

as the brushing together of your clothes fabric or the lifting

of your foot from a carpeted floor can generate static elec-

tricity sufficient to damage an ES device.)

1-5

Only for training and service purposes.

WPOnsinhfytw

^mt|xhtssjhyntsxyfyzx/

Onxuqf~|nsit|

]jrtyjxjsxtw

DThe buttons are located on the rear.

A1(Standby)

F (Function):^jqjhyxymjkzshyntsfsi

nsuzyxtzwhj/"bTQT0Z[_&SOXTL]N0M_0WR

_a0 HDMI IN)

-/+(Volume)

(Wi-Fi):NtssjhyxnsnynfqXzxnhQqt|uwtizhy

yt~tzwsjy|twp|nwjqjxxq~/

(Add):LiixymjfiinyntsfqXzxnhQqt|

uwtizhyyt~tzwsjy|twp/

"TshfxjymfytsjtwrtwjXzxnhQqt|uwtizhynx

htssjhyji/-

BDC IN "LNfifuyjwnsuzy-

CUSB (Service only) : ^&bit|sqtfihtssjhytw

DLAN port

EOPTICAL IN connector

FHDMI IN

GHDMI OUT (TV ARC) : NtssjhyytSOXTTY

"L]N-ts_a/

LAN

NAME OF EACH COMPONENT

• Front Panel

• Rear Panel

1-6

Only for training and service purposes.

WIRELESS SUBWOOFER CONNECTION

LED indicator of wireless subwoofer

LED Color Status

Green

(Blink) The connection is trying.

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.

2. Turn on the main unit : The sound bar and wireless

subwoofer will be automatically connected.

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 main 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

main unit and the subwoofer to communicate with

each other and make sounds.

•The closer the main unit and the subwoofer, the

better sound quality. It is recommended to install the

main unit and the subwoofer as close as possible

and avoid the cases below.

- There is a obstacle between the main unit and the

subwoofer.

- There is a 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 to prevent wireless interference.

!P

1-7

Only for training and service purposes.

HIDDEN MODE KEYS

MICOM RESET Main unit ' (Volume)' + Remote control 'SOUND EFFECT' for more than 3 seconds.

Micom Option Change Main unit ' (Volume)' + Remote control 'NIGHT' for more than 3 seconds.

VERSION CHECK

Main unit ' (Volume)' + Remote control ' (Play/Pause)' for more than 3 seconds.

Next : Forward Skip / Previous : Backward Skip

Exit : Power off

Direction key for HIDDEN MODE Play/Pause (UP) / REPEAT (Down) / Forward Skip (Right) / WOOFER LEVEL+ (Left) /

AUTO POWER ON (Enter)

Demo Mode (Play) Enter : Main unit “MIN” (volume minimum state) + Main unit 'F' (Function) for 7 seconds.

Exit : Main unit 'F' (Function) for 7 seconds.

TV Remote control On/Off On : Press and hold 'AV SYNC' on the remote control for about 2 seconds.

Off : Press and hold 'AV SYNC' and press it once again while “ON - TV REMOTE” is scrolled.

BT Name Display Press and hold 'REPEAT' on the remote control.

BT Lock On/Off

On : Press and hold 'AUTO POWER' on the remote control for about 2 seconds in BT function

and press it once again while “OFF - BT LOCK” is scrolled.

Off : Press and hold 'AUTO POWER' on the remote control for about 2 seconds in BT function

and press it once again while “ON - BT LOCK” is scrolled.

Display window : “ON - BT LOCK” <=> “OFF - BT LOCK”

Woofer TX Reset Main unit “MIN” (volume minimum state) + Remote control ' (Mute)' for about 5 seconds.

Woofer RX Reset ‘RESET’ on the woofer for 3 seconds.

HIDDEN KEY MODE

MICOM Version BE Version

1-8

Only for training and service purposes.

SOFTWARE UPDATE GUIDE

1. Using USB

1-1. MICOM

1) Copy the ﬁrmware to USB.

- Change the ﬁle name to “MICOM_SJ8.HEX”.

2) Insert USB to USB port.

3) VFD display “UPGRADE”.

4) Press “PLAY/PAUSE” key.

5) VFD display “M-UPDATE”.

6) Set auto power off after updating done.

1-2. MPEG

1) Copy the ﬁrmware to USB.

- Make the folder by “UPG_ALL” and copy ﬁrmware in “UPG_ALL” folder.

- Change the ﬁle name to “LG_NB_C000M08.ROM”.

2) Insert USB to USB port.

3) VFD display “UPGRADE”.

4) Press “PLAY/PAUSE” key.

5) VFD display “B-UPDATE”.

6) Set auto power off after updating done.

1-3. MEQ

1) Copy the ﬁrmware to USB.

- Change the ﬁle name to “MEQ_SJ8.BIN”.

2) Insert USB to USB port.

3) VFD display “UPGRADE”.

4) Press “PLAY/PAUSE” key.

5) VFD display “UPDATE”.

6) Return to the before function, after ﬁnished the updating.

1-4. EQ

1) Copy the ﬁrmware to USB.

- Change the ﬁle name to “EQ_PRG_SJ8.BIN”.

2) Insert USB to USB port.

3) VFD display “UPGRADE”.

4) Press “PLAY/PAUSE” key.

5) VFD display “EQUPDATE”.

6) Set auto power off after ﬁnished the updating.

1-9

Only for training and service purposes.

2. Using APP

Power on Smart Audio and implement Music Flow App in your smart phone.

1) Connect Speaker.

3) Settings -> Version Info.

2) Select red box.

4) Select Version info.

1-10

Only for training and service purposes.

Using APP

5) Display “Need to update” if there are

new ﬁrmware in the server.

6) Start Update below icon.

※Display new version info

if you press “Need to update”.

※Display update progress info.

※ Do not power off

during update.

1-11

Only for training and service purposes.

7) Display update info.

8) Display “Update is completed” message when Complete update.

Using APP

1-12

Only for training and service purposes.

3. Using MP tool

1) Open MP tool and select “Key DN”.

2) Check the section for download and open download ﬁle.

1-13

Only for training and service purposes.

3) Connect PC and SET by cross LAN cable.

PC IP setting

IP: 192.168.0.1

Subnet: 255.255.254.0

Gateway: 10.168.0.1

4) Set power on.

5) Connect LAN cable to Set and then Press “ADD” key within 3 seconds after connect the LAN.

(Please connect the LAN when blinking WiFi-LED after booting)

*Download ﬁle name

B/E : LG_NB_C000M08.ROM

MICOM : MICOM_SJ8.HEX

※Caution : Do not you update the B/E program and MICOM program at the same time.

6) Connect Status change “OK!” if success connect MP tool.

Using MP tool

1-14

Only for training and service purposes.

7) Press “Update” button.

8) Download result display “OK!” if start download.

Using MP tool

1-15

Only for training and service purposes.

9) You can identify update status by network indicator lamp.

White

Using MP tool

1-16

Only for training and service purposes.

VERSION CHECK

1) PC IP setting

IP: 192.168.0.1

Subnet: 255.255.254.0

Gateway: 10.168.0.1

2) Open MP tool.

3) Set power on.

4) Press “ADD” button after connect LAN cable.

5) Display the version in the tool.

1-17

Only for training and service purposes.

SPECIFICATIONS

• GENERAL

Power requirements 25 V 1.52 A (AC adapter)

Power consumption Refer to the main label on the unit.

Networked standby : 5.0 W (If all network ports are activated.)

AC adapter Model : DA-38A25

Manufacturer : Asian Power Devices Inc.

Input : 100 - 240 V ~ 50 - 60 Hz

Output : 25 V 1.52 A

Dimensions (W x H x D) Approx. 1220 mm x 38 mm x 105 mm (with foot)

Operating temperature 5 °C to 35 °C

Operating humidity 5 % to 90 %

Available Digital Input Audio

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

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

• INPUT/OUTPUT

OPTICAL 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

4K Sources dependent on HDCP 2.2 are supported at 4K resolutions.

• AMPLIFIER (RMS Output)

Total 300 W RMS

Front 65 W RMS x 2 (4 Ωat 1 kHz, THD 10%)

Subwoofer 170 W RMS (3 Ωat 80 Hz, THD 10%)

• WIRELESS SUBWOOFER

Power requirements Refer to the main label on the subwoofer.

Power consumption 33 W

Type 1 Way 1 Speaker

Impedance 3 Ω

Rated Input Power 170 W RMS

Max. Input Power 340 W RMS

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

• SYSTEM

LAN port Ethernet jack x 1, 10 BASE-T/100 BASE-TX

Wireless LAN (Internal antenna) Integrated IEEE 802.11n (Draft 2.0) wireless networking access,

compatible with 802.11a/b/g/n Wi-Fi networks.

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

1-18

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 MAIN UNIT ............................................................................................. 2-2

2. HOW TO DISASSEMBLE THE SUBWOOFER........................................................................................ 2-9

EXPLODED VIEWS ......................................................................................................................................... 2-13

1. MAIN UNIT SECTION............................................................................................................................. 2-13

2. WIRELESS SUBWOOFER SECTION.................................................................................................... 2-15

3. PACKING ACCESSORY SECTION ....................................................................................................... 2-17