Lg Gx / spn5-w User manual

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”

IN THIS MANUAL.

MODEL: GX / SPN5-W

P/NO : AFN30024644 JUNE, 2020

MODEL: GX / SPN5-W

Only for training and service purposes.

Wireless Sound Bar

“Any reproduction, duplication, distribution (including by way of email, facsimile or other

electronic means), publication, modification, copying or transmission of this Service Manual is

STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics

entity from which you received this Service Manual. The material covered by this prohibition includes,

without limitation, any text, graphics or logos in this Service Manual.”

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

SECTION 5 ........ WIRELESS RECEIVER PART (OPTION)

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

HIDDEN KEY MODE ......................................................................................................................................... 1-5

SOFTWARE UPDATE GUIDE........................................................................................................................... 1-6

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

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.

HIDDEN KEY MODE

HIDDEN MODE KEYS

EEPROM OPTION EDIT Main unit 'VOL-' + Remote Control ' '

EEPROM CLEAR (Initialize) Main unit 'VOL-' + Remote Control ' '

VERSION CHECK Main unit 'VOL-' + Remote Control 'Play/Pause'

1-6

Only for training and service purposes.

1. Preparation

1) GX Series Units : Main Unit, Wireless Subwoofer Unit, Rear Speaker Unit (Option).

2) GX RCU.

3) USB Memory.

4) Android device with “Music Flow Bluetooth” app for FOTA Update.

Caution

•Take care not to power off during update.

SOFTWARE UPDATE GUIDE

Necessary

<RCU>

Necessary

If wireless subwoofer rx module

of primary unit is updated

for USB update

Optional as model sufﬁx

If wireless rear rx module is

updated

“Music Flow Bluetooth” must be

installed for FOTA update

1-7

Only for training and service purposes.

2. Using USB

Step 1. Prepare GX update binaries.

Update module Preﬁx & Extension Filename Sample

B/E MAIN_GX*.BIN MAIN_GX_BAR_200429A.BIN

Micom MICOM_GX*.HEX MICOM_GX_BAR_2001220_E8F6.HEX

Wireless Subwoofer Tx WOOFERTX_GX*.BIN WOOFERTX_GX_200005_191028_Checksum_6D43.bin

Wireless Subwoofer Rx WOOFERRX_GX*.BIN WOOFERRX_GX_201005_191112_Checksum_4BB9.bin

Wireless Rear Tx REARTX_GX*.BIN REARTX_GX_204003_191126_Checksum_269F.bin

Wireless Rear Rx REARRX_GX*.BIN REARRX_GX_Ver185001_171128_checksum_DFDF.bin

MEQ MEQ_GX*.BIN MEQ_GX_BAR_200103D3_210828.BIN

PEQ PEQ_GX*.BIN PEQ_GX_BAR_1912260_6326.BIN

Option OPT*.BIN OPT_GX.BIN

Step 2. Copy all updated GX binaries to USB memory.

Step 3. Power on GX main unit.

Step 4. If there is an updated wireless subwoofer rx binary in update list,

you need to pair between main unit and subwoofer unit before start update.

Step 5. If there is an updated wireless rear rx binary in update list,

you need to pair between main unit and rear speaker unit before start update.

Step 6. Press Function key to change function to USB.

Verify whether USB function is or not by VFD.

Step 7. Attach USB which has update binaries to the USB slot of GX main unit.

(VFD Model)

USB

5 V 500 mA

1-8

Only for training and service purposes.

Using USB

Step 8. Update will start automatically.

VFD Model : Check VFD what module is in progress one by one.

In case of MEQ/PEQ, update will be progressed in short time since binary size are small,

so may not be recognized.

※The numbers in VFD display of wireless modules will increase in progress as progress percent from 00 to 100.

Step 9. GX main unit will be off automatically after update ﬁnish. (Enter Standby Mode)

Step 10. In case of option, GX will be powered off and then power on.

    

Blink ‘STBY’ Diaplay is off during 5 sec Blink ‘STBY’

Step 11. Check the current versions to verify whether the update was successfully completed or not.

1) Press “Version Check” hidden key

• Version Check Hidden Key : Press Set “Vol-” + RCU “Play/Pause” for 3secs.

*5 char- Scroll

Update module VFD display

B/E

MICOM

Wireless Subwoofer Tx

Wireless Subwoofer Rx

Wireless Rear Tx

Wireless Rear Rx

MEQ

PEQ

Option

M-UPDATE

B-UPDATE

WT 00

WR 00

STBY WRITE STBY

RR 00

RT 00

WRITE

MQ-UPDATE

EQ-UPDATE

< VFD Display in Update >

1-9

Only for training and service purposes.

Using USB

2) GX shows the version of all modules in the order shown below.

MICOM PEQ B/E MEQ Wireless Subwoofer Tx Wireless Subwoofer Rx

Wireless Rear Tx Wireless Rear Rx Option

3) Compare the version VFD shows and you updated.

Module VFD display sample

MICOM

PEQ

B/E

MEQ

Wireless Subwoofer Tx

Wireless Subwoofer Rx

Wireless Rear Tx

Wireless Rear Rx

Option

M2001151

PQ1912260-6326

B2001221

MQ200103D3

TX2000050

RX2000050

RT2040030

00 55 1A 44 ...

RR1850010

1-10

Only for training and service purposes.

Step 1. Prepare GX main unit and Android Device

with “Music Flow Bluetooth”. FOTA Update only sup-

ports B/E(Main) and MICOM module update.

Step 2. Power on GX main unit.

Step 3. Execute “Music Flow Bluetooth” App.

Step 4. Connect between android device and GX

main unit by “Music Flow Bluetooth” App.

3. Using APP (FOTA : Firmware update Over The Air)



1-11

Only for training and service purposes.

Step 5. Check the GX current version with “Music

Flow Bluetooth” App.

Step 6. If the main and micom version and of GX is

already the latest version, Current version and Latest

version in pop up window “Device version info.” are

same. Also update icon must be disabled.

Using APP (FOTA : Firmware update Over The Air)



1-12

Only for training and service purposes.

Step 7. If the main or micom version of GX is not the latest version, Current version and Latest version in pop up

window “Device version info.” are different. Also update icon must be enabled. touch update icon to start FOTA

update.

Step 8. FOTA update will be progress automatically as below sequence.

1) Download binary from server.

2) Transfer binary from Android device to GX main unit.

3) GX main unit executes update.

1) Download binary 2) Transfer to GX 3) Update progress

“Music Flow Bluetooth”

App

LED Model Current Function Function LEDs blink sequentially one by one from left to right.

VFD Model Current Function

Using APP (FOTA : Firmware update Over The Air)

DNLD

B-UP

M-UP

1-13

Only for training and service purposes.

Step 9. GX main unit will be off automatically after

update ﬁnish.

Step 10. Power on GX main unit again.

Step 11. Check the current versions to verify whether

the update was successfully completed in such a way

of Step 5.~ 6.

Using APP (FOTA : Firmware update Over The Air)



1-14

Only for training and service purposes.

SPECIFICATIONS

• GENERAL

Power consumption Refer to the main label on the unit.

AC adapter Model : DA-50F25

Manufacturer : Asian Power Devices Inc.

Input : 100 - 240 V ~ 50 - 60 Hz

Output : 25 V 2 A

Dimensions (W x H x D) Approx. 1446 mm x 150 mm x 32.5 mm

(56.9 inch x 5.9 inch x 1.28 inch)

Operating temperature 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity 5 % to 90 %

Bus Power Supply (USB) 5 V 500 mA

Available Digital Input Audio

Sampling Frequency

32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz

Available Digital Input Audio format

PCM/ Dolby Atmos / Dolby Digital / Dolby TrueHD/ DTS X Input

• 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

• AMPLIFIER (RMS Output)

Total 420 W RMS

Front 80 W (40 W + 40 W) RMS x 2 (4 Ωat 1 kHz, THD 10 %)

Center 40 W RMS (4 Ωat 1 kHz, THD 10 %)

Subwoofer 220 W RMS (3 Ωat 1 kHz, THD 10 %)

• 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 220 W RMS

Max. Input Power 440 W RMS

Dimensions (W x H x D) Approx. 180 mm x 394 mm x 290 mm

(7.1 inch x 15.6 inch x 11.5 inch)

SPK8-S (SPK8-S, S78S1-S), Sold Separately

• WIRELESS RECEIVER

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

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

Rear 70 W RMS x 2 (3 Ωat 1 kHz, THD 10 %)

Dimensions (W x H x D) Approx. 60 mm x 220 mm x 175 mm

(2.4 inch x 8.7 inch x 6.9 inch)

• REAR SPEAKERS (Each)

Type 1 Way 1 Speaker

Impedance 3 Ω

Rated Input Power 70 W RMS

Max. Input Power 140 W RMS

Dimensions (W x H x D) Approx. 100.0 mm x 140.0 mm x 100.0 mm

(3.9 inch x 5.5 inch x 3.9 inch)

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

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 (GX) SECTION .................................................................................................................... 2-13

2. WIRELESS SUBWOOFER (SPN5-W) SECTION .................................................................................. 2-17

3. PACKING ACCESSORY SECTION ....................................................................................................... 2-21

2-2

Only for training and service purposes.

1. HOW TO DISASSEMBLE THE MAIN UNIT

DISASSEMBLY INSTRUCTIONS

1) Chamber no. 1

3) MAIN PCB 4) AMP PCB

2) Chamber no. 2

2-3

Only for training and service purposes.

HOW TO DISASSEMBLE THE MAIN UNIT

1) Remove the 10 screws. (1SZZR-0097X)

2) Disconnect the SPK cable and Pull out the SPK.

2-4

Only for training and service purposes.

HOW TO DISASSEMBLE THE MAIN UNIT

1) Remove the 18 screws. (1SZZR-0097X)

2) Pull out the Rear Panel Assembly.

1) Remove the 2 screws. (1SZZR-0098A)

2) Disconnect the 2 Hanes cable.

1) Remove the 2 screws. (1SZZR-0098A)

2) Disconnect the FFC cable.

3) Remove the Front PCB

1) Remove the 3 screws. (1SZZR-0098A)

2)disconnect the 3 SPK cable.

1) Remove the 4 screws. (1SZZR-0098H)

2) Disconnect the SPK cable and Pull out the SPK.

2-5

Only for training and service purposes.

HOW TO DISASSEMBLE THE MAIN UNIT

1) Disconnect the FFC cable.

1) When disconnecting the woofer speaker cable, disconnect it by pressing it as shown.

1) Remove the 9 screws. (1SZZR-0098J)

2) Remove the 2 screws. (353-022S)

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