LG SP8YA Service Manual
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LG SP8YA Service Manual

Wi-fi sound bar
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Wi-Fi Sound Bar
SERVICE MANUAL
MODEL: SP8YA
(SP8YA, SPP8-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN30054107
FEBRUARY, 2021
"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 © 2021 LG Electronics Inc. All rights reserved.
Only for training and service purposes.

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Summary of Contents for LG SP8YA

  • 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    WIRELESS SUBWOOFER CONNECTION ....................... 1-5 WOOFER & REAR PAIRING METHOD ......................1-6 HIDDEN KEY MODE ............................1-7 FIRMWARE UPDATE GUIDE ........................... 1-8 SPECIFICATIONS ............................1-17 Copyright © 2021 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: 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. Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Firmware Update Guide

    Caution : • Take care not to power off during update. • Do format USB memory before update (FAT32 fi le system). Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 Step 6. Press Function key to change function to USB. Verify whether USB function is or not by VFD. Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 BT 00 Wireless Rear R Tx BR 00 Wireless Rear R Rx MQ-UP DATE scroll <SP8 Series EQ-UP DATE scroll VFD Display in Update> 1-10 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 Wireless Rear R Tx BR205210 Wireless Rear R Rx < SP8’s VFD Display T2001075 Touch in Version Display> 3) Compare the version VFD shows and you updated. 1-11 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 3. OOBE update (LG App) Step 1. Prepare SP8 main unit and Smart Phone with “LG Wi-Fi Speaker” App. In setting up the network in OOB(out of the box), SP8 will be updated to the latest version automatically. Step 2. Power on SP8 main unit.
  • Page 14 B-UPD scroll PLEAS E WAIT scroll WI-FI Step 6. At the end of the update step, LG App shows the SP8 on device list. 1-13 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Please use LG Wi-Fi Speaker App if you could. Step 1. Prepare SP8 main unit and Smart Phone with “Google Home” App. (LG Wi-Fi Speaker App recommended) In setting up the network in OOB(out of the box), SP8 will be updated to the latest version automatically.
  • Page 16 If the SP8 is already the latest version, network setup will be fi nish without update. M-UPD scroll B-UPD scroll PLEAS E WAIT scroll WI-FI 1-15 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 OOBE update (Google Home App) Step 6. At the end of the update step on Google Home App, the network setup is complete. 1-16 Copyright © 2021 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 1-18 Copyright © 2021 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 (SP8) SECTION ........................2-9 2. WIRELESS SUBWOOFER (SPP8-W) SECTION ................... 2-13 3. PACKING ACCESSORY SECTION ....................... 2-17 Copyright © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 28: Exploded Views

    EXPLODED VIEWS 1. MAIN UNIT (SP8) SECTION A80R CABLE5 MAIN A80C A80L CABLE2 CABLE3 CABLE1 LCD801 FRONT WIRELESS WIRELESS 2-10 Copyright © 2021 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Wireless Subwoofer (Spp8-W) Section

    2. WIRELESS SUBWOOFER (SPP8-W) SECTION A900 A45W A54W 2-13 2-14 Copyright © 2021 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: Packing Accessory Section

    836 Screws (2) 804A Woofer bag 803C Woofer packing 802A Accessory box 803A Woofer pad 803G Set pad 803 Main packing Set bag 802 Box 2-17 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 DA-50F25-AAAA 100~240Vac 25Vdc AAA77508402 Accessory Assembly SPK SP11RA/SP9RA/SP8RA Wallmou AGG75620751 Packing Assembly LAS550H silver new screw + bag AKB76038001 Remote Controller Assembly RAV21 Global_Hansung 21y(L-con 2-18 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 2. AMP P. C. BOARD DIAGRAM ......................3-21 3. FRONT LED P. C. BOARD DIAGRAM ....................3-23 4. MIC & TOUCH P. C. BOARD DIAGRAM ..................... 3-23 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 35: Wiring Diagram

    WIRING DIAGRAM Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 36: Block Diagram

    BLOCK DIAGRAM Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 37: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 1-3-3. Service hint (Any picture / Remark)     TP149 TP149   TP142 TP142   < MAIN board bottom view > Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 40: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 2-2-3. Service hint (Any picture / Remark)     JK202 JK202   R257 R257 L200 L200   < MAIN board top view > Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 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 > Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 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 > 3-10 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 44: 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 > 3-11 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 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 > 3-12 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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 > 3-13 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 47: 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) 3-14 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 48: Remote Control

    “ Low” Timing 4.56 ms 4.0 ms ~ 7.0 ms “ High” Timing 4.45 ms 3.9 ms ~ 5.5 ms Fig 2-3. Remote Control Low Timing 3-15 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Optical

    FET SWITCH 100nF DGND Select DGND OPTICAL 3.3V_OPT 3.3VA JK202 L200 R257 MICOM OPT_DET VOUT C281 C282 C283 C280 100nF 15pF 100pF 10uF DGND DGND 3-16 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 50: Circuit Voltage Chart

    IC,LDO Voltage Regulator VOUT: ADJ 1.8V VOUT: 1.843 (EAN64395201) IC322 VIN: 2.3 to 6V VIN: 3.402 IC,LDO Voltage Regulator VOUT: ADJ 1.05V VOUT: 1.052 (EAN64395201) 3-17 3-18 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 51: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-19 3-20 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 52: Amp P. C. Board Diagram

    2. AMP P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-21 3-22 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 53: 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) 3-23 3-24 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 55: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 56: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING Reset KEY SW+/SW- PWM IC AMP IC Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 57: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 59: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 60: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 61: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 62: Amp Voltage

    4. AMP VOLTAGE FIG 4-2. AMP_12V FIG 4-1. AMP PVDD Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 63: Pwm

    5. PWM FIG 5-2. Woofer PWM SW- Signal FIG 5-1. Woofer PWM SW+ Signal 4-10 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 64: Led

    6. LED FIG 6-2. Pairing On Status  Green LED FIG 6-1. Pairing Off Status  Red LED 4-11 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 4-12 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 66: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 67: 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 © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 WAVEFORMS ..............................5-6 PRINTED CIRCUIT BOARD DIAGRAMS ......................5-7 1. WIRELESS RECEIVER SMPS P. C. BOARD ..................5-7 2. WIRELESS RECEIVER AMP P. C. BOARD .................... 5-9 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 69: Wiring Diagram

    WIRING DIAGRAM Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 70: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING R R eset KEY RL+,-/RR+,- PWM IC Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 71: One Point Repair Guide

    Check Module or connection. Replace AMP board. 2-3. Service hint (Any picture / Remark) RIC307 RIC307 RIC307 < AMP board top view > Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 72: Electrical Troubleshooting Guide

    LED is Red. Remate. AMP PVDD Check SMPS board. (RCN301 pin9, 10) no output. 3.3 V (RIC307 pin3) Check RIC307. no output. Check Module or Connection. Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 73: Waveforms

    WAVEFORMS 1. AUDIO PART (I2S) RCN302 pin1 : I2S LRCK RCN302 pin3 : I2S BCK Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 74: 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. Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 75: Wireless Receiver Amp P. C. Board

    2. WIRELESS RECEIVER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 5-10 Copyright © 2021 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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