LG SK6Y Service Manual
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LG SK6Y Service Manual

Smart hi-fi audio wireless multi-room sound bar
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CONFIDENTIAL
SMART Hi-Fi AUDIO
Wireless Multi-room Sound Bar
SERVICE MANUAL
MODEL: SK6Y
(SK6Y, SPK5B-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN78212059
JANUARY, 2018
"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 © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.

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Summary of Contents for LG SK6Y

  • 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    WIRELESS SUBWOOFER CONNECTION ....................... 1-6 REAR SPEAKERS CONNECTION (SOLD SEPARATELY) ................1-7 HIDDEN KEY MODE ............................1-8 SOFTWARE UPDATE GUIDE ........................... 1-9 SPECIFICATIONS ............................1-16 Copyright © 2018 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: Name Of Each Component

    A DC IN E LAN port B OPTICAL IN connector F HDMI IN C PORTABLE IN connector G HDMI OUT (TV ARC) D USB (Service only) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: Wireless Subwoofer Connection

    Pairing button.) 2. Turn on the sound bar. 3. Pairing is completed. - The green LED on the rear of the wireless subwoofer turns on. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: Rear Speakers Connection (Sold Separately)

    - The yellow - green LED on the wireless receiver – to –. If the cables are reversed, the sound will be turns on. distorted and will lack bass. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Hidden Key Mode

    • ENTER : Press Mute key for 3 seconds when Woofer and Wireless Rear speaker is off. • RESULT : VFD displays ‘WL RESET’’ and initialize TX module. Paring will be disconnected. < MAIN Key > < Remocon > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Software Update Guide

    DO NOT turn off during displaying ‘PLEASE WAIT’ on VFD. ※ Before update Woofer RX or Rear Rx WOOFER RX, Woofer and Rear Speaker have to be paired with Main soundbar Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 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. Copyright © 2018 LG Electronics Inc. All rights reserved. 1-10 Only for training and service purposes.
  • Page 12 Step 4. If there is new version on server, press Update. Step 7. After update f nish, application Step 6. Updating show the result. Copyright © 2018 LG Electronics Inc. All rights reserved. 1-11 Only for training and service purposes.

  • Page 13: Specifications

    Approx. 100 mm x 140 mm x 100 mm (3.9 inch x 5.5 inch x 3.9 inch) • Designs and specifications are subject to change without prior notice. Copyright © 2018 LG Electronics Inc. All rights reserved. 1-16 Only for training and service purposes.
  • Page 14 2. HOW TO DISASSEMBLE THE SUBWOOFER ..................2-9 EXPLODED VIEWS ............................2-13 1. MAIN UNIT SECTION ..........................2-13 2. WIRELESS SUBWOOFER SECTION ....................2-15 3. PACKING ACCESSORY SECTION ....................... 2-17 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 15: Disassembly Instructions

    ※ Before begin, position the Main Unit upside down. 1-1. Case Bottom Assembly 1) Remove the 24 screws. 2) Remove the Case Bottom Assembly. Figure 1-1 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 16: How To Disassemble The Main Unit

    1) Disconnect the 2 Network cables and harness cable from the Main PCB Assembly. Figure 1-2 (1) 2) Remove the 2 screws. 3) Remove the Main Frame Assembly (Main Chassis + PCBA). Figure 1-2 (2) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 2) Disconnect the FFC cables from the Main PCB. 3) Remove the 1 screw (Main + HDMI Jack). 4) Remove the Main PCB Assembly. Figure 1-2-2 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 5) Remove the WIRELESS module. 6) Disconnect the FFC cable from the WIRELESS module(RECEIVER). 7) Remove the WIRELESS module(RECEIVER). WIRELESS Module (RECEIVER) BT Module WIRELESS Module Figure 1-2-3 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 HOW TO DISASSEMBLE THE MAIN UNIT 1-2-4. WI-FI Module 1) Disconnect the FFC cable from the WI-FI module. 2) Disconnect the Hook. 3) Remove the WI-FI module. Module Figure 1-2-4 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 2) Disconnect the Network cable. Figure 1-3 1-4. KEY PCB Assembly 1) Remove the Button Assembly. 2) Remove the Key PCB Assembly. 3) Disconnect the harness cable. Figure 1-4 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 When assembling, place the cables (Speaker network cables and Key cable) as shown in the f gure below. Figure 1-5. < Speaker network cable from SPK Chamber L/R Assembly to MAIN PCB > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 23: 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 © 2018 LG Electronics Inc. All rights reserved. 2-10 Only for training and service purposes.
  • Page 24 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) Copyright © 2018 LG Electronics Inc. All rights reserved. 2-11 Only for training and service purposes.
  • Page 25 Copyright © 2018 LG Electronics Inc. All rights reserved. 2-12 Only for training and service purposes.

  • Page 26: Exploded Views

    TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. A80R MAIN FRONT LCD401 CABLE1 WIRELESS A80L CABLE7 CABLE4 CABLE2 CABLE3 WIRELESS Copyright © 2018 LG Electronics Inc. All rights reserved. 2-13 2-14 Only for training and service purposes.

  • Page 27: Wireless Subwoofer Section

    2. WIRELESS SUBWOOFER SECTION A900 A45W A54W Copyright © 2018 LG Electronics Inc. All rights reserved. 2-15 2-16 Only for training and service purposes.

  • Page 28: Packing Accessory Section

    Optional Part  806 Optical cable 900 Remote control 833 AC adapter 300 Power cord 836 Screws (2) 835 Wall bracket 829 Cable tie Copyright © 2018 LG Electronics Inc. All rights reserved. 2-17 Only for training and service purposes.
  • Page 29 Copyright © 2018 LG Electronics Inc. All rights reserved. 2-18 Only for training and service purposes.
  • Page 30 PRINTED CIRCUIT BOARD DIAGRAMS ....................... 3-23 1. MAIN P. C. BOARD DIAGRAM ......................3-23 2. FRONT P. C. BOARD DIAGRAM ......................3-25 3. KEY P. C. BOARD DIAGRAM ......................3-25 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 31: Wiring Diagram

    WIRING DIAGRAM Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: Block Diagram

    BLOCK DIAGRAM Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 2. POWER BLOCK DIAGRAM Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 34: One Point Repair Guide

    1-1-3. Service hint (Any picture / Remark)       L302 L302   IC302 IC302 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 3) If 5.1 VA is OK, replace FRONT board. 1-2-3. Service hint (Any picture / Remark)   L301 L301 IC301 IC301   < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 1-3-3. Service hint (Any picture / Remark)     CN107 CN107     3.3 VA 3.3 VA < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 37: Sound

    If no signal, please replace MAIN board. 2-1-3. Service hint (Any picture / Remark)     CN104 CN104 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 2-2-3. Service hint (Any picture / Remark)         R207 R207 FB203 FB203 < MAIN board bottom view > < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 2) If soldering status and HDMI_5V are abnormal, replace MAIN board. 2-3-3. Service hint (Any picture / Remark)     IC306 IC306 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 2) If portable jack and voltage has abnormal status, replace MAIN board. 2-4-3. Service hint (Any picture / Remark)     IC200 IC200     < MAIN board bottom view > Copyright © 2018 LG Electronics Inc. All rights reserved. 3-10 Only for training and service purposes.

  • Page 41: Protection Error

    3) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-) has DC voltage, replace MAIN bottom board. 3-1-3. Service hint (Any picture / Remark) CN703 CN703 IC600 IC600 CN704 CN704 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. 3-11 Only for training and service purposes.
  • Page 42 4) If check point 1), 2), 3) is ok, replace MAIN board. 3-2-3. Service hint (Any picture / Remark) IC701 IC701 IC700 IC700 < MAIN board bottom view > Copyright © 2018 LG Electronics Inc. All rights reserved. 3-12 Only for training and service purposes.
  • Page 43 2) If 12 V is OK, replace MAIN board. 3-3-3. Service hint (Any picture / Remark) IC701 IC701 IC700 IC700 < MAIN board bottom view > Copyright © 2018 LG Electronics Inc. All rights reserved. 3-13 Only for training and service purposes.

  • Page 44: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL FIG 1-1. X501 (27 MHz) FIG 1-2. X600 (24.576 MHz) 2. FLASH MEMORY FIG 2. VCC, CS#, CLK, DO Copyright © 2018 LG Electronics Inc. All rights reserved. 3-14 Only for training and service purposes.

  • Page 45: Tact Key

    FIG 3-3. Press FUNC Key FIG 3-4. Press VOL(-) Key About : 0.77 V About : 0.45 V FIG 3-5. Press VOL(+) Key FIG 3-6. Press Wi-Fi Key Copyright © 2018 LG Electronics Inc. All rights reserved. 3-15 Only for training and service purposes.
  • Page 46 TACT KEY Copyright © 2018 LG Electronics Inc. All rights reserved. 3-16 Only for training and service purposes.

  • Page 47: Remote Control

    “ Low” Timing 4.4 ms 3.6 ms ~ 5.04 ms “ High” Timing 4.48 ms 4.08 ms ~ 5.04 ms FIG 4-3. High Timing Copyright © 2018 LG Electronics Inc. All rights reserved. 3-17 Only for training and service purposes.

  • Page 48: Optical

    5. OPTICAL FIG 5-1. OPT_IN FIG 5-2. OPT_DET Copyright © 2018 LG Electronics Inc. All rights reserved. 3-18 Only for training and service purposes.

  • Page 49: Circuit Voltage Chart

    IC302 DC,DC Vin: 2 • Measured Voltage: Vout: 1 Vin: 3.33 V Vout: 3 Vcc: 25.44 V out: 3.31 V Vout: 12.05 V Copyright © 2018 LG Electronics Inc. All rights reserved. 3-19 3-20 Only for training and service purposes.
  • Page 50 IC,Sound/Audio Processor VIN33_REG2: 66 • Measured Voltage: VDD_PLL: 68 VDD_IO: 3.34 V VDD_CORE: 1.22 V VIN33_REG1: 3.34 V VIN33_REG2: 3.34 V VDD_PLL: 1.22 V Copyright © 2018 LG Electronics Inc. All rights reserved. 3-21 3-22 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) Copyright © 2018 LG Electronics Inc. All rights reserved. 3-23 3-24 Only for training and service purposes.

  • Page 52: Front P. C. Board Diagram

    2. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) Copyright © 2018 LG Electronics Inc. All rights reserved. 3-25 3-26 Only for training and service purposes.
  • Page 53 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 54: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 55: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING Reset KEY SW+/SW- PWM IC AMP IC Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 56: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 58: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 59: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 60: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 61: Amp Voltage

    4. AMP VOLTAGE FIG 4-2. AMP_12V FIG 4-1. AMP PVDD Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 62: Pwm

    5. PWM FIG 5-2. Woofer PWM SW- Signal FIG 5-1. Woofer PWM SW+ Signal Copyright © 2018 LG Electronics Inc. All rights reserved. 4-10 Only for training and service purposes.

  • Page 63: Led

    6. LED FIG 6-2. Pairing On Status  Green LED FIG 6-1. Pairing Off Status  Red LED Copyright © 2018 LG Electronics Inc. All rights reserved. 4-11 Only for training and service purposes.
  • Page 64 Copyright © 2018 LG Electronics Inc. All rights reserved. 4-12 Only for training and service purposes.

  • Page 65: 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 Copyright © 2018 LG Electronics Inc. All rights reserved. 4-13 4-14 Only for training and service purposes.

  • Page 66: 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. Copyright © 2018 LG Electronics Inc. All rights reserved. 4-15 4-16 Only for training and service purposes.
  • Page 67 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 68: Wiring Diagram

    WIRING DIAGRAM Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 69: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING R R eset KEY RL+,-/RR+,- PWM IC Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 70: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 71 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 72: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 73: Waveforms

    WAVEFORMS 1. AUDIO PART (I2S) RCN303 pin1 : I2S LRCK RCN303 pin3 : I2S BCK RCN303 pin20 : I2S Audio Data Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 74 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 75: 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 © 2018 LG Electronics Inc. All rights reserved. 5-10 Only for training and service purposes.

  • Page 76: Wireless Receiver Amp P. C. Board

    2. WIRELESS RECEIVER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) Copyright © 2018 LG Electronics Inc. All rights reserved. 5-11 5-12 Only for training and service purposes.

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