LG SN8YG Service Manual
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LG SN8YG Service Manual

Wi-fi sound bar
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Wi-Fi Sound Bar
SERVICE MANUAL
MODEL: SN8YG
(SN8YG, SPN8-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN30014509
FEBRUARY, 2020
"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."
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.

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Summary of Contents for LG SN8YG

  • Page 1 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.”...
  • Page 2 SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..WIRELESS SUBWOOFER PART SECTION 5 ..WIRELESS RECEIVER PART (OPTION) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 4: Product Safety Servicing Guidelines For Audio Products

    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.

  • Page 5: Servicing Precautions

    Note 1: Accessible Conductive Parts include Metal panels, tricity sufficient to damage an ES device.) Input terminals, Earphone jacks,etc. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: Name Of Each Component

    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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 - 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. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: Wireless Subwoofer Connection

    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. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Rear Speakers Connection (Sold Separately)

    + to + and the wireless receiver turns on. – to –. If the cables are reversed, the sound will be distorted and will lack bass. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Woofer & Rear Pairing Method

    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 > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: Hidden Key Mode

    • 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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 12: Software Update Guide

    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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 Verify whether USB function is or not by VFD. (VFD Model) Step 7.Attach USB which has update binaries to the USB slot back of SN11’s main unit. 500 mA 1-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 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. 1-13 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Rear R Rx 00 75 05 93 ... Option <SN11’s VFD Display in Version Display> 3) Compare the version VFD shows and you updated. 1-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 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. 1-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 Step 4. If there is new version on server, press Update. Step 7. After update fi nish, application Step 6. Updating show the result. 1-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: Specifications

    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. 1-17 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 1-18 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 21: Disassembly Instructions

    (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) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 22: How To Disassemble The Main Unit

    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) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 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) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 1) Remove the 11 screws. Figure 2-1 (1) 2) Pull out the Rear Panel Assembly and disconnect the SPK cable. Rear Panel Assembly SPK cable Figure 2-1 (2) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 26: How To Disassemble The Subwoofer

    2) Assemble the WIRELESS module into the wireless holder. 3) Attach the EVA sheet (0.15T) to the WIRELESS module. 4) Connect the FFC cable. Figure 2-2 (2) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 2-3. AMP+SMPS PCB Assembly 1) Disconnect the Power inlet socket cable. Figure 2-3 (1) 2) Remove the 5 screws. 3) Remove the AMP+SMPS PCB Assembly. Figure 2-3 (2) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 28: Exploded Views

    EXPLODED VIEWS 1. MAIN UNIT (SN8) SECTION A80R CABLE5 MAIN A80C A80L CABLE2 CABLE3 CABLE1 LCD801 FRONT WIRELESS WIRELESS 2-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 26P050D-H01-0F01A-T 70 70MM 0. CABLE2 EAD63970514 Cable,FFC AT05026090C04 90MM 0.50MM 26P CABLE3 EAD63970513 Cable,FFC AT05026370C01 370MM 0.50MM 26P CABLE5 EAD65366201 Harness,Single CAV-18-29 12507HS-H12G1 to 125 2-11 2-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Wireless Subwoofer (Spn8-W) Section

    2. WIRELESS SUBWOOFER (SPN8-W) SECTION A900 A45W A54W 2-13 2-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 Panel Assembly,Rear SPK7-W WW COMMON_SL10YG.DDVEVN EAD62131521 Cable,FFC 26P005D-H1-1F01A-T-60-60-0-0-0 EAG63233208 Socket,Power DAC-18JN08 2P STRAIGHT WIRE BK MHK65448501 Sheet COMPLEX LDPE 20.6X15.6 2 0.5 T 2-15 2-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: Packing Accessory Section

    806 Optical cable 300 Power cord (Main unit) 833 AC adapter 300W Power cord (Woofer) 835 Wall bracket 836 Screws (2) 900 Remote control 2-17 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 AAA77508401 Accessory Assembly SPK SK9Y/SK10Y Wallmount Brack AGG75620751 Packing Assembly LAS550H silver new screw + bag AKB75595351 Remote Controller Assembly MA6 SM/SL10/9/8YG Soundbar SJ 2-18 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 2. AMP P. C. BOARD DIAGRAM ......................3-23 3. FRONT LED P. C. BOARD DIAGRAM ....................3-25 4. MIC & TOUCH P. C. BOARD DIAGRAM ..................... 3-25 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 35: Wiring Diagram

    WIRING DIAGRAM Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 36: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 37: Power Block Diagram

    2. POWER BLOCK DIAGRAM Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 38: One Point Repair Guide

    1-1-3. Service hint (Any picture / Remark)   IC604 IC604       L611 L611 FB611 FB611 IC604 IC604 < AMP board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 3) If 3.3 VA is OK, replace FRONT board. 1-2-3. Service hint (Any picture / Remark) IC303 IC303   L317 L317   IC303 IC303 < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 1-3-3. Service hint (Any picture / Remark)     TP149 TP149   TP142 TP142   < MAIN board bottom view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 41: Sound

    If Wi-Fi_3.45 V is OK, please check USB_DM_P1, USB_DP_P1 (pin10, 11). If no signal, please replace MAIN board. 2-1-3. Service hint (Any picture / Remark) CN209 CN209 < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 2-2-3. Service hint (Any picture / Remark)     JK202 JK202   R257 R257 L200 L200   < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 2) If soldering status and HDMI_5 V(FL809) are abnormal, replace MAIN board. 2-3-3. Service hint (Any picture / Remark)   IC804 IC804 FL809 FL809   IC804 IC804 < MAIN board top view > 3-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 2) If soldering status and USB_5 V are abnormal, replace MAIN board. 2-4-3. Service hint (Any picture / Remark)   JK201 JK201   < MAIN board top view > 3-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 45: Protection Error

    3-1-3. Service hint (Any picture / Remark) CN703 CN703 CN702 CN702 CN704 CN704 CN702 CN702 CN703 CN703 CN704 CN704 < AMP board top view > 3-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 4) If check point 1), 2), 3) is OK, replace AMP board. 3-2-3. Service hint (Any picture / Remark) IC702 IC702 IC701 IC701 IC700 IC700 < AMP board bottom view > 3-13 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 2) If 12 V is OK, replace AMP board. 3-3-3. Service hint (Any picture / Remark) IC702 IC702 IC701 IC701 IC700 IC700 < AMP board bottom view > 3-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 48: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL Fig 1-1. Crystal Fig 1-2. Crystal XA601 (24.576 MHz) X501 (27 MHz) 3-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Remote Control

    “ Low” Timing 4.56 ms 3.6 ms ~ 5.04 ms “ High” Timing 4.45 ms 4.08 ms ~ 5.04 ms Fig 2-3. Remote Control Low Timing 3-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 50: Optical

    3. OPTICAL Fig 3-1. Optical Fig 3-2. Optical Opt In Opt Det 3-17 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 3-18 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 52: Circuit Voltage Chart

    VOUT: 1.81 IC404 CONFIG : to 3.6 V IOVDD : 1.81 V Conversion IC IOVDD : to 3.6 V CONFIG : 1.81 V 3-19 3-20 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 53: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-21 3-22 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 54: Amp P. C. Board Diagram

    2. AMP P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-23 3-24 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 55: Front Led P. C. Board Diagram

    3. FRONT LED P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 4. MIC & TOUCH P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-25 3-26 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 6. LED ............................... 4-11 CIRCUIT VOLTAGE CHART ........................... 4-13 PRINTED CIRCUIT BOARD DIAGRAMS ....................... 4-15 1. WOOFER SMPS & AMP P. C. BOARD ....................4-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 57: Wiring Diagram

    WIRING DIAGRAM 2P, 3.96mm ST, Non Lock SMD Wireless 26P, 0.5mm ST, Non Lock SMD 2P, 3.96mm ST, Non Lock , SMD Power Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 58: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING Reset KEY SW+/SW- PWM IC AMP IC Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 59: One Point Repair Guide

    If you can’t check 12 VA voltage, refer to the step 1-1. WL707 WL707 WIC705 WIC705 < Woofer SMPS & AMP board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 3) 1), 2) is NG  Replace WIC703. If you can’t check PVDD voltage, then replace the PCB board. WIC703 WIC703 < Woofer SMPS & AMP board bottom view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 61: Wireless Connection

     The main set and the wireless subwoofer are factory reset mode, then power on. WFB604 WFB604 Wireless module Wireless module Connection check Connection check < Woofer SMPS & AMP board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 62: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL FIG 1. WX601 (24.576 MHz) 2. FLASH MEMORY FIG 2. VCC, CS#, CLK, DO Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 63: Voltage

    3. VOLTAGE FIG 3-2. Woofer 12 VA FIG 3-1. Woofer PVDD FIG 3-3. Woofer 3.3 VA FIG 3-4. Woofer 3.3V_PWM Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 64: Amp Voltage

    4. AMP VOLTAGE FIG 4-2. AMP_12V FIG 4-1. AMP PVDD Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 65: Pwm

    5. PWM FIG 5-2. Woofer PWM SW- Signal FIG 5-1. Woofer PWM SW+ Signal 4-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 66: Led

    6. LED FIG 6-2. Pairing On Status  Green LED FIG 6-1. Pairing Off Status  Red LED 4-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 67 4-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 68: Circuit Voltage Chart

    12.52 V 12.52 V 4.5 V ~ 17 V WIC705 DC,DC Converter VOUT: SW: #2 3.42 V 3.42 V 0.76 V ~ 7 V 4-13 4-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 69: Printed Circuit Board Diagrams

    1. WOOFER SMPS & AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 4-15 4-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 70 WAVEFORMS ..............................5-7 PRINTED CIRCUIT BOARD DIAGRAMS ......................5-9 1. WIRELESS RECEIVER SMPS P. C. BOARD ..................5-9 2. WIRELESS RECEIVER AMP P. C. BOARD ..................5-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 71: Wiring Diagram

    WIRING DIAGRAM Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 72: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING R R eset KEY RL+,-/RR+,- PWM IC Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 73: One Point Repair Guide

    Check 3.3 V. Replace AMP board. 2-3. Service hint (Any picture / Remark) RIC308 RIC308 RIC308 RIC307 RIC307 RIC307 < AMP board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 74 Check Module or connection. Replace AMP board. 3-3. Service hint (Any picture / Remark) RIC308 RIC308 RIC308 RIC307 RIC307 RIC307 < AMP board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 75: Electrical Troubleshooting Guide

    (RCN301 pin9, 10) no output. AMP 12 V (RIC308 pin4) Check RIC308. no output. 3.3 V (RIC307 pin3) Check RIC307. no output. Check Module or Connection. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 76: Waveforms

    WAVEFORMS 1. AUDIO PART (I2S) RCN303 pin1 : I2S LRCK RCN303 pin3 : I2S BCK RCN303 pin20 : I2S Audio Data Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 77 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 78: Printed Circuit Board Diagrams

    1. WIRELESS RECEIVER SMPS P. C. BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 5-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 79: Wireless Receiver Amp P. C. Board

    2. WIRELESS RECEIVER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 5-11 5-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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