LG SN8YG Service manual

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.

MODEL: SN8YG (SN8YG, SPN8-W)

P/NO : AFN30014509 FEBRUARY, 2020

MODEL: SN8YG

(SN8YG, SPN8-W)

Wi-Fi 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.”

CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

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

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

1-1

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

1-2

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 designators 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, implementation 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 equilateral triangle is intended to convey to the service personnel the following 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 component 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 electrical 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, conduit, 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 constitutes 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 platform 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 extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

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Only for training and service purposes.

SERVICING PRECAUTIONS

CAUTION: Before servicing the service data and its supplements and addends, read and follow 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 precautions. Remember Safety First :

General Servicing Precautions

1. Always unplug 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 of its assemblies.

3. Unless specified otherwise in this service data, clean electrical 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 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 resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1: Accessible Conductive Parts include Metal panels, Input terminals, Earphone jacks,etc.

Audio products

AC power cord from the

Audio products

covered by this

Audio products

and / or any

or any

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 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 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 electricity sufficient to damage an ES device.)

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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 F repeatedly.

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

1-5

Only for training and service purposes.

Google Assistant LED

- Changes LED status according to Google Assistant performance.

LED Status Description

All four LEDs are on.

All four LEDs blink. Responds to your voice command.

Microphone is off and the solid

amber LED will be on.

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.

 Rear panel

Ready to listen to your voice

command.

Voice recognition is disable

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.

1-6

Only for training and service purposes.

WIRELESS SUBWOOFER CONNECTION

Pairing

LED indicator of wireless subwoofer

LED Color Status

Green (Blink)

Green The connection is completed.

Red

Off (No display)

Setting up the wireless subwoofer for the ﬁ rst 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.

The connection is trying.

The wireless subwoofer is in standby mode or the connection is failed.

The power cord of wireless subwoofer is disconnected.

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.

XGGG

OZUZGP

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.

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.

1-7

Only for training and service purposes.

REAR SPEAKERS CONNECTION (SOLD SEPARATELY)

Connecting the rear speakers

1. Connect the black stripe wire to the terminal marked - (minus) and the other end to the terminal marked + (plus).

LED indicator of wireless receiver

LED Color Status

Yellow - green

(Blink)

Yellow - green

Red

Off

(No display)

The connection is trying.

The connection is completed.

The wireless receiver is in standby mode or the connection is failed.

The power cord of wireless receiver is disconnected

Setting up the wireless receiver for the ﬁ rst 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.

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.

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.

1-8

Only for training and service purposes.

WOOFER & REAR PAIRING METHOD

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.

Paring Key

Standby LED

Mute Key

< Remocon >

< Subwoofer > < Rear kit back >

< Rear kit front >

1-9

Only for training and service purposes.

HIDDEN KEY MODE

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 modiﬁ ed 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.

1-10

Only for training and service purposes.

SOFTWARE UPDATE GUIDE

1. Preparation

1) SN11 Series Units : Main Unit, Wireless Subwoofer Unit, Rear L/R Speaker Unit [※ SN10/ SN9/ SN8 : Rear-kit (optional)]

2) RCU.

3) USB Memory.

Necessary

<RCU>

Necessary

If wireless subwoofer rx module

of primary unit is updated

for USB update

<Rear-kit Speaker Unit>

Optional as model sufﬁ x

If wireless rear rx module is

updated

Caution

• Take care not to power off during update.

• Do format USB memory before update (FAT32 ﬁ le system).

1-11

Only for training and service purposes.

2. Using USB

Step 1. Prepare SN11/ SN10/ SN9/ SN8 update binaries.

Update module Preﬁ x & Extension Filename Sample

MAIN

Micom MICOM_SNx_WSB_*.HEX MICOM_SNx_WSB_2001063_BB06_rev2428_PP2.HEX

Wireless

Subwoofer Tx (All)

Wireless

Subwoofer Rx(All)

Wireless Rear Tx REARTX_SNx_*.BIN REARTX_SNx_204003_191126_Checksum_269F.bin

Wireless Rear Rx REARRX_SNx_*.BIN REARRX_SNx_Ver185001_171128_checksum_DFDF.bin

Wireless L Tx (SN11) REARLTX_SN11_*.BIN REARLTX_SN11_WSB_204106_191213_Checksum_DD95.bin

Wireless R Tx (SN11) REARRTX_SN11_*.BIN REARRTX_SN11_WSB_204206_191213_Checksum_D26E.bin

Wireless L Rx (SN11) REARLRX_SN11_*.BIN REARLRX_SN11_WRK_205110_200102_Checksum_75A2.bin

Wireless R Rx (SN11) REARRRX_SN11_*.BIN REARRRX_SN11_WRK_205210_200102_Checksum_69B2.bin

MEQ MEQ_SNx_WSB_*.BIN MEQ_SN11_WSB_19122763_095858.BIN

PEQ PEQ_SNx_WSB_*.BIN PEQ_SN11_WSB_1911150_6326.bin

TOUCH TOUCH_SNx_*.BIN TOUCH_SN11_191211_0xF621.dld

MAIN_SNx_GVA_WSB_2001062.bin MAIN_SNx_C4A_WSB_2001062.bin

WOOFERTX_SNx_*.BIN WOOFERTX_SNx_200005_191028_Checksum_6D43.bin

WOOFERRX_SNx_*.BIN WOOFERRX_SNx_201005_191112_Checksum_4BB9.bin

Step 2. Copy all updated SN8 binaries to USB memory. [※ ex) F:\MAIN_SN8_GVA_WSB_2001062.bin]

MAIN_SN11_GVA_WSB_2001062.bin MAIN_SN11_C4A_WSB_2001062.bin

Step 3. Power on SN11’s 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.

USB

(VFD Model)

Step 7.Attach USB which has update binaries to the USB slot back of SN11’s main unit.

5 V 500 mA

1-12

Only for training and service purposes.

Using USB

Step 8. Display “Read” and “REMOVE”.

Un-plug USB memory stick. Update will start automatically. Check VFD what module is in progress one by one.

Update module VFD display

MAIN

MICOM

SUB-MICOM

Wireless Subwoofer Tx

Wireless Subwoofer Rx

Wireless Rear Tx

Wireless Rear Rx

Wireless L Tx

Wireless R Tx

Wireless L Rx

Wireless R Rx

MEQ

PEQ

D-UPDATE

M-UPDATE

T-UPDATE

WT 00

WR 00

RT 00

RR 00

AT 00

AR 00

BT 00

BR 00

MEQ-UPDATE

PEQ-UPDATE

Option

T-UPDATE

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

Step 9. SN11’s main unit will be off automatically after update ﬁ nish.

Step 10. Power on SN11’s main unit again.

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.

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Only for training and service purposes.

Using USB

2) SN11’s shows the version of all modules in the order shown below.

Module VFD display sample

MICOM

PEQ

MAIN

GVA

MEQ

Wireless Subwoofer Tx

Wireless Subwoofer Rx

Rear L Tx

Rear L Rx

Touch

Sub-Micom

Rear R Tx

Rear R Rx

M1912247

PQ1812030-6326

B1901140

1.40.168834

MQ161221

TX190007

RX191008

AT2041050

AR2041050

T1910111

L1912160

BT2041050

BR2041050

Option

<SN11’s VFD Display in Version Display>

3) Compare the version VFD shows and you updated.

00 75 05 93 ...

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Only for training and service purposes.

3. Using APP

Before Network update, soundbar has to be connected with ‘LG Wiﬁ Soundbar’ Application.

Step 1. Select setting gui.

Step 2. Select software version display.

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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 5. Update ﬁ le downloading.

Step 6. Updating

Step 7. After update ﬁ nish, application show the result.

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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 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

• AMPLIFIER (RMS Output)

Total 440 W RMS Front 50 W RMS x 2 (4 Ω at 1 kHz, THD 10 %) Center 40 W RMS (4 Ω at 1 kHz, THD 10 %) Top 40 W RMS x 2 (4 Ω at 1 kHz, THD 10 %) Subwoofer 220 W RMS (3 Ω at 80 Hz, THD 10 %)

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

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

• 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 Ω at 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.

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Only for training and service purposes.

1-18

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 (SN8) SECTION .................................................................................................................... 2-9

2. WIRELESS SUBWOOFER (SPN8-W) SECTION .................................................................................. 2-13

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

2-1

Only for training and service purposes.

DISASSEMBLY INSTRUCTIONS

1. HOW TO DISASSEMBLE THE MAIN UNIT

1-1. Disassemble of Case Bottom

Disassemble Red points Screw(1SSZR-0097X) : 24 EA (Disassemble Screw (1SSZR-0097X) : 24 EA)

Figure 1-1

1-2. Disassemble Main PCB and Frame

(1) (Disassemble Case) – 3 Point

Figure 1-2 (1)

(2) (Disassemble Screw) – 2 Point Disassemble Red points Screw(1SSZR-0098H) : 2 EA (Disassemble Screw(1SSZR-0098H) : 2 EA)

Figure 1-2 (2)

2-2

Only for training and service purposes.

HOW TO DISASSEMBLE THE MAIN UNIT

1-3. Disassemble Chamber

Figure 1-3

1-4. Disassemble Main PCB and AMP PCB

Disassemble Red points Screw(1SSZR-0098H) : 2 EA (Disassemble Screw(1SSZR-0098H) : 2 EA)

Figure 1-4

1-5. Disassemble PCB

(1) (Disassemble Front PCB Screw) Disassemble Red points Screw(1SSZR-0098H) : 2 EA (Disassemble Screw(1SSZR-0098H) : 2 EA)

Figure 1-5 (1)

2-3

Only for training and service purposes.

HOW TO DISASSEMBLE THE MAIN UNIT

(2) (Disassemble Main PCB and Amp PCB)

- Disassemble Cable – 4 Point of red mark

Figure 1-5 (2)

1-6. Disassemble Main PCB

- (Disassemble screw – 2 Point of red mark)

Figure 1-6 (1)

Disassemble Red points Screw(234-022S) : 2 EA)

Figure 1-6 (2)

2-4

Only for training and service purposes.

HOW TO DISASSEMBLE THE MAIN UNIT

1-7. Disassemble of Module Holders (Wi-Fi + BT Holder / Wireless / Rear Wireless)

- (Disassemble screw – 2 Point of red mark) (Disassemble Red points Screw(1SSZR-0098H) : 2 EA)

Figure 1-7

2-5

Only for training and service purposes.

+ 55 hidden pages

LG SN8YG Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual