LG SL8YG User manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
CONFIDENTIAL
MODEL: SL8YG (SL8YG, SPL8-W)
P/NO : AFN78474486
FEBRUARY, 2019
MODEL: SL8YG
(SL8YG, SPL8-W)
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Wi-Fi Sound Bar

1-1
Copyright © 2019 LG Electronics Inc. All rights reserved.
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
Copyright © 2019 LG Electronics Inc. All rights reserved.
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....................................................................................................... 1-7
REAR SPEAKERS CONNECTION (SOLD SEPARATELY) ............................................................................ 1-8
WOOFER & REAR PAIRING METHOD............................................................................................................ 1-9
HIDDEN KEY MODE ....................................................................................................................................... 1-10
SOFTWARE UPDATE GUIDE......................................................................................................................... 1-11
SPECIFICATIONS ........................................................................................................................................... 1-14

1-3
Copyright © 2019 LG Electronics Inc. All rights reserved.
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
Copyright © 2019 LG Electronics Inc. All rights reserved.
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
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
NAME OF EACH COMPONENT
Front panel
(Standby)
- Switches the unit ON or OFF.
F(Function)
- Select the function and input source by pressing Frepeatedly.
Input source / Function Display
Wi-Fi Wi-Fi
Bluetooth BT
Optical, ARC, LG Sound Sync (Wired) LG TV
HDMI IN HDMI
USB USB
Note: You can use Bluetooth function after making Wi-Fi network connection by using Google Home app.
+/−(Volume)
- Adjusts volume level.
- Starts playback. / Pauses playback.
(Mic mute)
- Disables the detect voice recognition by pressing . All the Google Assistant LED turns amber and
“The mic is muted.” is heard.
To cancel it, press again. Google Assistant LED turns off and “The mic is back on.” is heard.
- Enables Google Assistant to receive your voice commands .
To cancel it, press again.
Microphone
Remote sensor
1
2
3

1-6
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Rear panel
DC IN
- Connect to the AC adapter.
HDMI OUT (TV ARC)
- Connect the HDMI OUT (TV ARC) jack on the back of the unit to ARC jack on the TV.
HDMI IN
- Connect HDMI IN jack on the back of the unit to HDMI OUT jack on the external device.
You can enjoy the sound and picture from HDMI connection on an external device.
OPTICAL IN
- Connect the OPTICAL IN jack on the back of the unit to OPTICAL OUT jack on the TV.
USB Port
- Connect USB memory device to the USB port on the back of the unit.
1
3
2
4
5
Google Assistant LED
- Changes LED status according to Google Assistant performance.
LED Status Description
All four LEDs are on. Ready to listen to your voice
command.
All four LEDs blink. Responds to your voice command.
Microphone is off and the solid
amber LED will be on. Voice recognition is disable
Display Window
- Display window will be darkened automatically if there is no key input for 15 seconds.
When you press any button, the display window will brighten.
4
5

1-7
Copyright © 2019 LG Electronics Inc. All rights reserved.
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 of the sound bar and the
wireless subwoofer to the outlet.
2. Turn on the sound bar. The sound bar and the
wireless subwoofer will be automatically connected.
- Pairing is completed. The green LED on the rear
of the 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 on the rear of the wireless subwoofer.
- The green LED on the rear of the wireless
subwoofer blinks quickly. (If the green LED does
not blink, press and hold the Pairing)
2. Turn on the sound bar.
3. Pairing is completed.
- 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 (3.3 ft) to prevent wireless
interference.
Pairing
XGGG
OZUZGP

1-8
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Connecting the rear speakers
1. Connect the black stripe wire to the terminal
marked - (minus) and the other end to the terminal
marked + (plus).
2. Connect the wireless receiver and the rear
speakers (right, left) with the speaker cables.
Color Position
Grey Rear right
Blue Rear left
Note :
You need to purchase the wireless rear speakers kit
(SPK8-S) to enjoy surround sound.
Caution :
•Use the speaker supplied with this unit only. Using
any other speaker may cause malfunction.
•Be sure to match the speaker cable to the
appropriate terminal on the components: + to + and
– to –. If the cables are reversed, the sound will be
distorted and will lack bass.
LED indicator of wireless receiver
LED Color Status
Yellow - green
(Blink) The connection is trying.
Yellow - green
The connection is completed.
Red
The wireless receiver is in
standby mode or the connection
is failed.
Off
(No display)
The power cord of wireless
receiver is disconnected
Setting up the wireless receiver for the
first time
1. Connect the power cord to the wireless receiver
to the outlet.
2. Turn on the main unit : The sound bar and
wireless receiver will be automatically connected.
- Yellow - green LED on the wireless receiver
turns on.
Manually pairing wireless receiver
When your connection is not completed, you can
see the red LED on the wireless receiver and rear
speakers do not made sound. To solve the problem,
follow the below steps.
1. Press PAIRING button on the rear of the wireless
receiver.
- The yellow - green LED on the wireless receiver
blinks quickly.
2. Turn on the main unit
- Paring is completed. The yellow - green LED on
the wireless receiver turns on.
REAR SPEAKERS CONNECTION (SOLD SEPARATELY)

1-9
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
How to pair Subwoofer and Rear kit
1) Down volume minimum to use Remocon or MAIN set key (Press ‘-’ key).
2) Press ‘Mute’ key (about 2~3 seconds) on Remocon and then will display “WL RESET” on LCD.
3) Press paring key on the Subwoofer and Rear kit.
4) When woofer and rear kit attempt to connect wireless, the Green color LED blink faster than standby status.
5) When woofer and rear kit connect wireless completely, the LED will maintain Green color.
WOOFER & REAR PAIRING METHOD
< Remocon > < Rear kit front >
Mute Key
Paring Key
Standby LED
< Subwoofer > < Rear kit back >

1-10
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
1. Factory Reset
Press MIC Mute key 5 seconds, VFD display RESET. System rebooting.
2. Check Version
• Soundbar Volume ‘−’ key + Remocon PLAY key for 3 seconds.
• Each Program Version is displayed when press Remocon F.Skip key.
M : MICOM PQ : PEQ B : Main APK No Alphabet : Main Android
TX : Woofer TX RX : Woofer RX D : DSP H : HDMI
RR : Rear RX RT : Rear TX T : Touch L : Sub MICOM
< MICOM > < DSP > < PEQ >
3. Option Change
Soundbar Volume ‘−’ key and Remocon for 3 seconds.
• B.skip and F.Skip can change Option Number.
• Play/Pause key can change Option Value.
• Remocon ‘Info’ key can save a modified Option and Reboot.
4. Woofer (Rear Speaker) Reset
Soundbar Volume ‘−’ key and Remocon MUTE for 3sec
• Volume must be Min ( 0 ) before input those keys.
• Woofer (Rear Speaker) must Power Off before input those keys.
• Woofer and Rear Speaker can be reset by pressing reset button on each unit.
HIDDEN KEY MODE

1-11
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
1. Using USB
1-1. File Name
(Main Program cannot update by USB. Only Network Update available by Google Home Application after
Setup a soundbar.)
MICOM MICOM_SLx_xxxxxxx.HEX
PEQ PEQ_SLx_xxxxxxx.BIN ,
WOOFER TX WOOFERTX_SLx_xxxxxxx.BIN
WOOFER RX WOOFERRX_SLx_xxxxxxx.BIN ,
REAR TX REARTX_SLx_xxxxxxx.BIN ,
REAR RX REARRX_SLx_xxxxxxx.BIN,
DSP DSP_SLx_xxxxxxx.wav ,
HDMI HDMI_SLx_xxxxxxx.bin
1-2. Update Steps
1) Create ‘UPDATE’ Folder in USB root Folder.
2) Copy all update files to UPDATE folder.
3) After Soundbar Booting finish, insert USB.
4) Check “REMOVE USB” on VFD.
5) Detach USB.
VFD display ‘WIFI’ for a second and system will reboot automatically.
6) After Rebooting finish, update will start.
Wait until update finish and rebooting.
SOFTWARE UPDATE GUIDE

1-12
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
2. Using APP
Before Network update, soundbar has to be connected with ‘LG WifiSoundbar’ Application.
Step 1. Select setting gui.
Step 2. Select software version display.

1-13
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
Using APP
Step 3. System compare current version
with the latest version at server.
Step 4. If there is new version on server, press Update.
Step 6. Updating Step 7. After update finish, application
show the result.
Step 5. Update file downloading.

1-14
Copyright © 2019 LG Electronics Inc. All rights reserved.
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. 1060.0 mm x 57.0 mm x 119.0 mm (with foot)
(41.7 inch x 2.2 inch x 4.7 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
Available Digital Input Audio format Dolby Atmos, Dolby Audio, DTS:X, DTS-HD, 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
1080p, 1080i, 720p, 576p, 480p
2160p@24/25/30 Hz 4:4:4
2160p@60/50 Hz 4:2:0
4
K Sources dependent on HDCP 2.2 are supported at 4K resolutions.
• AMPLIFIER (RMS Output)
Total 440 W RMS
Front 50 W RMS x 2 (4 Ωat 1 kHz, THD 10 %)
Center 40 W RMS (4 Ωat 1 kHz, THD 10 %)
Top 40 W RMS x 2 (4 Ωat 1 kHz, THD 10 %)
Subwoofer 220 W RMS (3 Ωat 80 Hz, THD 10 %)
• WIRELESS SUBWOOFER
Power requirements Refer to the main label on the subwoofer.
Power consumption Refer to the main label on the 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. 221.0 mm x 390.0 mm x 312.8 mm
(8.7 inch x 15.4 inch x 12.3 inch)
• SYSTEM
Wireless LAN (Internal antenna) 802.11a/b/g/n Wi-Fi networks
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. 60.0 mm x 220.0 mm x 175.0 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
Copyright © 2019 LG Electronics Inc. All rights reserved.
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........................................................................................ 2-6
EXPLODED VIEWS ........................................................................................................................................... 2-9
1. MAIN UNIT SECTION............................................................................................................................... 2-9
2. WIRELESS SUBWOOFER SECTION.................................................................................................... 2-11
3. PACKING ACCESSORY SECTION ....................................................................................................... 2-13

2-2
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
DISASSEMBLY INSTRUCTIONS
1. HOW TO DISASSEMBLE THE MAIN UNIT
Figure 1-1
1-1. Disassemble of Case Bottom
Disassemble Red points Screw(1SSZR-0097X) : 24EA
(Disassemble Screw (1SSZR-0097X) : 24 EA)
Figure 1-2 (1)
1-2. Disassemble Main PCB and Frame
(1) (Disassemble Case) – 4 Point
Figure 1-2 (2)
(2) (Disassemble Screw) – 2 Point
Disassemble Red points Screw(1SSZR-0098H) : 2EA (Disassemble Screw(1SSZR-0098H) : 2EA)

2-3
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
HOW TO DISASSEMBLE THE MAIN UNIT
Figure 1-3
1-3. Disassemble Chamber
Figure 1-4
1-4. Disassemble Main PCB and AMP PCB
Disassemble Red points Screw(1SSZR-0098H) : 3EA
(Disassemble Screw(1SSZR-0098H) : 3EA)

2-4
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
HOW TO DISASSEMBLE THE MAIN UNIT
Figure 1-5 (1)
1-5. Disassemble PCB
(1) (Disassemble Front PCB Screw)
Disassemble Red points Screw(1SSZR-0098H) : 2EA (Disassemble Screw(1SSZR-0098H) : 2EA)
Figure 1-5 (2)
(2) (Disassemble Main PCB and Amp PCB)
- Disassemble Cable – 4 Point of red mark
Figure 1-6
1-6. Disassemble DSP PCB
- (Disassemble Screw – 4 Point of red mark)
Disassemble Red points Screw(1SSZR-0098H) : 4EA)

2-5
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
HOW TO DISASSEMBLE THE MAIN UNIT
Figure 1-7 (1)
1-7. Disassemble Main PCB
- (Disassemble screw – 2 Point of red mark)
Figure 1-7 (2)
Disassemble Red points Screw(234-022S) : 2EA)
Figure 1-8
1-8. Disassemble of Module Holders (Wi-Fi + BT Holder / Wireless / Rear Wireless)
- (Disassemble screw – 3 Point of red mark)
(Disassemble Red points Screw(1SSZR-0098H) : 3 EA)