LG SN7Y Service Manual
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LG SN7Y Service Manual

Wireless sound bar
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Wireless Sound Bar
SERVICE MANUAL
MODEL: SN7Y
(SN7Y, SPN5B-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN30024602
MAY, 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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Questions and answers

Steve Fletcher
February 24, 2025

Subwoofer green light but wont connect to sound bar

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1 comments:
Mr. Anderson
February 24, 2025

The LG SN7Y subwoofer may not produce sound despite the green light being on due to a software issue caused by an update. The subwoofer's SPI chip may need to be reprogrammed for it to function correctly. Additionally, if the internal ribbon cable is not properly connected, the subwoofer may not power on or work correctly.

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Summary of Contents for LG SN7Y

  • 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

    • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES HIDDEN KEY MODE ............................1-5 SOFTWARE UPDATE GUIDE ........................... 1-6 SPECIFICATIONS ............................1-14 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: Hidden Key Mode

    Main unit 'VOL-' + Remote Control ' EEPROM CLEAR (Initialize) Main unit 'VOL-' + Remote Control ' VERSION CHECK Main unit 'VOL-' + Remote Control 'Play/Pause' Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: Software Update Guide

    SOFTWARE UPDATE GUIDE 1. Preparation 1) SN7 Series Units : Main Unit, Wireless Subwoofer Unit (Only for SN7Y), Rear Speaker Unit. 2) SN7 RCU. 3) USB Memory. 4) Android device with “Music Flow Bluetooth” app for FOTA Update. <Wireless Subwoofer Unit <Rear Speaker Unit>...
  • Page 8 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. (Only for SN7Y) 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.
  • Page 9 Step 11. Check the current versions to verify whether the update was successfully completed or not. <VFD Model> 1) Press “Version Check” hidden key • Version Check Hidden Key : Press Set “Vol-” + RCU “Play/Pause” for 3secs. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 Wireless Rear Rx T1912307 Front Touch IC 00 55 1A 44 ... Option <SN7 VFD version display> 3) Compare the version VFD shows and you updated. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 Step 3. Execute “Music Flow Bluetooth” App. Step 4. Connect between android device and SN7 main unit by “Music Flow Bluetooth” App.   1-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 Current version and Latest version in pop up window “Device version info.” are same. Also update icon must be disabled.   1-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 3) SN7 main unit executes update. 1) Download binary 2) Transfer to SN7 3) Update progress “Music Flow Bluetooth” D UPDATE DNLD VFD Model Current Function M UPDATE 1-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 Step 10. Power on SN7 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. 1-13 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 15: 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. 1-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 2. HOW TO DISASSEMBLE THE SUBWOOFER ..................2-8 EXPLODED VIEWS ............................2-11 1. MAIN UNIT (SN7Y) SECTION ........................ 2-11 2. WIRELESS SUBWOOFER (SPN5B-W) SECTION ................2-15 3. PACKING ACCESSORY SECTION ....................... 2-19 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 17: Disassembly Instructions

    Speaker R Speaker R Speaker R Speaker L Speaker L Speaker L AMP PCB AMP PCB AMP PCB Main PCB Main PCB Main PCB Front PCB Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: How To Disassemble The Main Unit

    1) Remove the 21 screws(1SZZR-0097X) in the direction of the fi gure. Connectors Screws 1) Remove the 4 connectors. 2) Remove the 3 screws(1SSZR-0098H) in the direction of the fi gure. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 [ Total disassembly ] [ Chamber ] Dampers Screws 1) Remove the 2 dampers. 2) Remove the 10 screws(1SZZR-0097X) in the direction of the fi gure. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main set 1) Remove the 1 screw(1SSZR-0098H). 1) Disassemble Main PCB (Disassemble screws(353-022S) - 2 point red mark) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 HOW TO DISASSEMBLE THE MAIN UNIT LCD Module Assembly 1) Disconnect the cable from the LCD module assembly. 2) Remove the 2 screws(1SSZR-0098H). 1) Remove the 2 screws(1SSZR-0098H). Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main set 1) Disassemble red point 3 screws(1SSZR-0098H). Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 1) Remove the 8 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 24: How To Disassemble The Subwoofer

    1) Attach the EVA gaskets (1.0T) to both sides of the WIRELESS module. 2) Assemble the WIRELESS module into the wireless holder. Figure 2-2 (2) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 1) Disconnect the Power inlet socket cable. AMP+SMPS PCB Assembly Figure 2-3 (1) 2) Remove the 5 screws. 3) Remove the AMP+SMPS PCB Assembly. AMP+SMPS PCB Assembly Figure 2-3 (2) 2-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 26: Exploded Views

    EXPLODED VIEWS 1. MAIN UNIT (SN7Y) SECTION A80R CABLE1 CABLE2 A80L MAIN WIRELESS CABLE5 LCD01 CABLE3 WIRELESS CABLE4 2-11 2-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 CABLE2 EAD61049032 Cable,FFC 8P100D-H01-0F01AS-T 50 50MM 1. CABLE3 EAD63970525 Cable,FFC 26P050C-H01-2F01A-T 320-25-225 CABLE4 EAD62131543 Cable,FFC 26P050D-H01-1F01A-T 70-25-45 7 CABLE5 EAD62185625 Cable,FFC 12P050D-H01-1F01A-T 190-140-50 2-13 2-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 28: Wireless Subwoofer (Spn5B-W) Section

    2. WIRELESS SUBWOOFER (SPN5B-W) SECTION A900 A45W A54W 2-15 2-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 WL1NB6_ 0DBM 0DB 0% 0A 0A 0DB AGL30012602 Panel Assembly,Rear SPN5B-W SN5Y Panel Rear Assy EAD62131539 Cable,FFC 26P050D-H01-1F01A-N 60-22-38 6 EAG63233208 Socket,Power DAC-18JN08 2P STRAIGHT WIRE BK 2-17 2-18 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 300 Power cord (Main,Woofer) 900 Remote control 833 AC adapter 836 Screws (2) 835 Wall bracket 2-19 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 DA-50F25-AAAA 100~240Vac 25Vdc AAA77508401 Accessory Assembly SPK SK9Y/SK10Y Wallmount Brack AGG75620751 Packing Assembly LAS550H silver new screw + bag AKB75595331 Remote Controller Assembly MA6 SM/SL10/9/8/7/6/5/4 Soundb 2-20 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 PRINTED CIRCUIT BOARD DIAGRAMS ....................... 3-23 1. MAIN P. C. BOARD DIAGRAM ......................3-23 2. AMP P. C. BOARD DIAGRAM ......................3-25 3. TOUCH P. C. BOARD DIAGRAM ......................3-27 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 33: Wiring Diagram

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

  • Page 34: Block Diagrams

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

  • Page 35: Power Block Diagram

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

  • Page 36: One Point Repair Guide

    R784 100K DGND DGND C7L7 R781 100nF VOUT = 0.792x(47K/3.3K+1)= 12.072V DGND DGND IC704 IC704 L700 L700   < AMP board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 R323 8.2K R322 (1%) R329 1.5M NC DGND VOUT = 0.798x(70.2K/13K+1)= 5.107V DGND IC302 IC302   L303 L303 < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 2.7K R324 (1%) (1%) R328 1.5M NC DGND VOUT = 0.798x(41.7K/13K+1)= 3.36V DGND IC311 IC311   L310 L310 < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 2.2uF TP153 VB1+ /10V(X5R) /10V(X5R) TP154 VB0+ C158 0.33uF TP155 VLCD R191 DGND CN103 CN103   VCC_5V VCC_5V < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 40: Sound

    MICOM BT_WAKEUP TP232 R244 GPIO BT_STBY C270 C271 C272 100nF 100pF 100pF TP233 ZD202 DGND CN202 CN202   < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 OPT_DET VOUT C282 15pF C283 100pF DGND DGND JK202 JK202 R256 R256 FB200 FB200     < MAIN board top view > 3-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 I_LIM : 0.2 ~ 2 [A] I_LIM [A] = 230[V]/R_SET[ohm] = 230/R3A2 = 230/470 = 0.489[A] IC303 IC303 < MAIN board bottom view > 3-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 R260 USB_DN USB_DM_P0 MT8531 TP236 R255 USB_DP USB_DP_P0 TP237 C278 C279 10pF 10pF DGND JK201 JK201   < MAIN board top view > 3-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 44: Protection Error

    4) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-, C+/-) has DC voltage, then replace AMP board. 3-1-3. Service hint (Any picture / Remark) CN704 CN704 CN702 CN702 CN703 CN703 < AMP board top view > 3-13 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 2) If 12 V is OK, replace AMP board. 3-2-3. Service hint (Any picture / Remark) IC701 IC701 IC702 IC702 IC700 IC700 < AMP board bottom view > 3-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 46: Waveforms Of Major Check Point

    4.7K 4.7K 4.7K R1C1 C163 4.7K 100nF MSF_SPI_CS /16V HOLD# MSF_MISO DGND SCLK MSF_CLK MSF_MOSI GIGA DEVICE DGND FIG 2. VCC, CS#, CLK, DO 3-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 47: Buzzer

    TP235 R260 USB_DN USB_DM_P0 MT8531 TP236 R255 USB_DP USB_DP_P0 TP237 C278 C279 10pF 10pF DGND FIG 4. USB 5 V, USB D+, USB D- 3-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 48: Remote Control

    “ Low” Timing 4.52 ms 3.6 ms ~ 5.04 ms “ High” Timing 4.45 ms 4.08 ms ~ 5.04 ms FIG 5-3. High Timing 3-17 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Optical

    R293 C290 100nF FET SWITCH 3.3V_OPT DGND DGND JK202 Select C281 C280 100nF 10uF MICOM R257 OPT_DET VOUT C282 15pF C283 100pF DGND DGND 3-18 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 50: Circuit Voltage Chart

    AD22, AD23 …. AVDD33 3.15 V~3.45 V 3.3 V A6, Y8 AVDD18 1.71 V~1.89 V 1.8 V AVDD105 0.99 V~1.10 V 1.0 V 3-19 3-20 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 51: Capacitor Voltage

    Capacitor, AL,Chip 100 uF/16 V 3.30 3.30 3.40 3.30 3.40 -55 ~ 105 °C/2000 HR 3. CONNECTOR VOLTAGE CN100 (MAIN <-> WIRELESS WOFFER) / SN7Y ONLY POWER MAIN WIRELESS REAR SPEC. WLS_3V3 3.34 3.31 V 3.3 V (3.15~3.45 V) CN101 (MAIN <-> WIRELESS REAR)

  • Page 52: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN 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 53: Amp P. C. Board Diagram

    2. AMP 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 54: Touch P. C. Board Diagram

    3. TOUCH P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-27 3-28 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 3-29 3-30 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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