LG SL8YG Service Manual
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LG SL8YG Service Manual

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

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  • Page 1 Wi-Fi Sound Bar SERVICE MANUAL MODEL: SL8YG (SL8YG, SPL8-W) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN78474486 FEBRUARY, 2019 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • 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 © 2019 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 ............................1-14 Copyright © 2019 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 © 2019 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 © 2019 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 © 2019 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 © 2019 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 © 2019 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 © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 12: Software Update Guide

    VFD display ‘WIFI’ for a second and system will reboot automatically. 6) After Rebooting fi nish, update will start. Wait until update fi nish and rebooting. 1-11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 2. 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. 1-12 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 Step 4. If there is new version on server, press Update. Step 7. After update fi nish, application Step 6. Updating show the result. 1-13 Copyright © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 2. HOW TO DISASSEMBLE THE SUBWOOFER ..................2-6 EXPLODED VIEWS ............................2-9 1. MAIN UNIT SECTION ..........................2-9 2. WIRELESS SUBWOOFER SECTION ....................2-11 3. PACKING ACCESSORY SECTION ....................... 2-13 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 17: Disassembly Instructions

    (1) (Disassemble Case) – 4 Point Figure 1-2 (1) (2) (Disassemble Screw) – 2 Point Disassemble Red points Screw(1SSZR-0098H) : 2EA (Disassemble Screw(1SSZR-0098H) : 2EA) Figure 1-2 (2) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: How To Disassemble The Main Unit

    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) : 3EA (Disassemble Screw(1SSZR-0098H) : 3EA) Figure 1-4 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 - Disassemble Cable – 4 Point of red mark Figure 1-5 (2) 1-6. Disassemble DSP PCB - (Disassemble Screw – 4 Point of red mark) Disassemble Red points Screw(1SSZR-0098H) : 4EA) Figure 1-6 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 1-8. Disassemble of Module Holders (Wi-Fi + BT Holder / Wireless / Rear Wireless) - (Disassemble screw – 3 Point of red mark) (Disassemble Red points Screw(1SSZR-0098H) : 3 EA) Figure 1-8 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 22: 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 24: Exploded Views

    EXPLODED VIEWS 1. MAIN UNIT SECTION A80R MPEG CABLE4 A80C CABLE5 MAIN A80L WI-FI CABLE2 CABLE1 CABLE3 LCD801 FRONT WIRELESS WIRELESS 2-10 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 25: Wireless Subwoofer Section

    2. WIRELESS SUBWOOFER SECTION A900 A45W A54W 2-11 2-12 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 26: Packing Accessory Section

    833 AC adapter 806 Optical cable 300 Power cord 835 Wall bracket 836 Screws (2) 829 Cable tie (3) 837 Holder, foot 900 Remote control 2-13 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 2-14 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 3. AMP P. C. BOARD DIAGRAM ......................3-29 4. FRONT LED P. C. BOARD DIAGRAM ....................3-31 5. MIC & TOUCH P. C. BOARD DIAGRAM ..................... 3-31 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 29: Wiring Diagram

    WIRING DIAGRAM Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM 74AHC244 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 31: Power Block Diagram

    2. POWER BLOCK DIAGRAM Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: One Point Repair Guide

    P C B S I Z E : 2 3 3 X 9 9 7 Y G 2 0 1 9 . 0 1 . 0 8 < AMP board top view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 33: Booting When You Turn The Unit On, No Message Or "Hello" On Front Panel

    C N 1 0 5 C 1 8 1 C 4 1 3 R 1 J 7 C 2 F 4 < MAIN board top view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 C 2 6 5 C 2 6 2 C 2 P 3 Q 1 0 2 C N 2 0 3 < MAIN board top view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 C 2 6 2 C 2 P 3 Q 1 0 2 C N 2 0 3 CN103 CN103 < MAIN board top view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 36: Sound

    C 2 P 2 C 2 1 8 L 3 0 3 R 8 4 2 R 8 4 3 < MAIN board top view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 C 2 P 2 C 2 1 8 L 3 0 3 R 8 4 2 R 8 4 3 < MAIN board top view > 3-10 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 C 3 2 6 C 8 0 2 R 2 8 6 R 3 1 8 R 2 C 8 < MAIN board top view > 3-11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 C 2 P 2 C 2 1 8 L 3 0 3 R 8 4 2 R 8 4 3 < MAIN board top view > 3-12 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 40: Protection Error

    AR607 AR607 C 7 6 9 C 7 0 3 AR606 AR606 CN704 CN704 C 7 3 4 < AMP board top view > 3-13 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 L 7 0 2 C 7 0 8 C 7 1 0 R 7 0 1 C 7 0 4 < AMP board bottom view > 3-14 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 L 7 0 2 C 7 0 8 C 7 1 0 R 7 0 1 C 7 0 4 < AMP board bottom view > 3-15 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 43: Waveforms Of Major Check Point

    X800 27MHz INPUT/OUTPUT FLOAT FLOAT INPUT/OUTPUT C800 X500 C804 3 X-TAL2 15pF 10pF X-TAL1 2 GND DGND 26MHz C558 R827 R831 DGND 1.8K R829 3-16 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 44: Crystal

    X201 12.288Mhz 1 X-TAL 2 GND R670 1 ST DGND 4 GND 3 X-TAL 24.576MHz C616 C202 10nF DGND R224 DGND 27pF R223 DGND 3-17 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 R604 Z02W3.9V DGND DGND RA600 XA601 2.2K 24.576MHz CA600 4 FLOAT INPUT/OUTPUT RA601 1 INPUT/OUTPUT FLOAT CA620 DGND Fig 1-7. Crystal XA601 (24.576 MHz) 3-18 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 46: Remote Control

    4.08 ms ~ 5.04 ms Fig 2-3. Remote Control Low Timing RCF01 AO-R123C7G-LG(T) H=3.2mm ,SMD,Vertical IR RECEIVER 3.3VA RF01 CF02 CF01 CF03 10uF 100nF 100pF ZDF01 Z02W3.9V DGND 3-19 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 47: Optical

    3.3VA JK201 FB215 PZ1608U221-1R4TF R2C1 R2C3 OPT_IN VOUT C286 C287 R2C4 C285 MPEG M_OPT_IN 100nF 15pF 10uF R2C2 MICOM OPT_DET C292 100pF DGND DGND 3-20 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 48: Circuit Voltage Chart

    Vout : 3.36 V DVCC33_IO : 3.31 V Out : 4.16 V AVDD12_LDO : K15 DDRVCCIO1 : 1.50 V AVDD33 : 3.34 V 3-21 3-22 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Capacitors

    VCC : 3.36 V Spec : VCDDIO : 2.7~3.6 V IC, Capacitive Touch Sensor VDDIO : 24 Measured : VCC : 3.36 V 3-23 3-24 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 50: Printed Circuit Board Diagrams

    R 8 3 4 C 8 0 2 C 3 2 6 R 2 8 6 R 3 1 8 R 2 C 8 (BOTTOM VIEW) 3-25 3-26 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 51: Dsp P. C. Board Diagram

    C 6 F 4 R 6 E 7 R 6 E 8 R 6 F 8 F B 6 0 2 I C 6 0 7 3-27 3-28 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 52: Amp P. C. Board Diagram

    R 7 4 8 C 7 6 9 C 7 0 3 R 7 4 7 R 7 4 6 C 7 3 4 (BOTTOM VIEW) 3-29 3-30 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 53: Front Led P. C. Board Diagram

    VOLUME + PAUSE TRIGGER Q M 0 3 R M 2 3 R M 0 3 R M 0 4 R M 0 5 3-31 3-32 Copyright © 2019 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 © 2019 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 © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 57: One Point Repair Guide

    W C N 6 0 1 W C 6 0 8 W C 6 0 6 W C 6 0 7 < Woofer SMPS & AMP board top view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 W C 7 7 1 W C 7 7 5 W C 7 0 9 W R 7 2 6 < Woofer SMPS & AMP board bottom view > Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 59: Wireless Connection

    W R 7 6 2 W R 7 6 4 W C 7 6 2 W R 7 7 4 < Woofer SMPS & AMP board top view > Copyright © 2019 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 © 2019 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 © 2019 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 © 2019 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 © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 4-12 Copyright © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 67: Printed Circuit Board Diagrams

    W R 7 6 4 W C 7 6 2 W R 7 7 4 W C 7 0 9 W R 7 2 6 4-15 4-16 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 69: Wiring Diagram

    WIRING DIAGRAM Copyright © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 71: 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 72 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 73: 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 74: Waveforms

    WAVEFORMS 1. AUDIO PART (I2S) RCN303 pin1 : I2S LRCK RCN303 pin3 : I2S BCK RCN303 pin20 : I2S Audio Data Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 75 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 76: 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 77: Wireless Receiver Amp P. C. Board

    2. WIRELESS RECEIVER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 5-11 5-12 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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