LG SKC9 Service Manual
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LG SKC9 Service Manual

Lg wi-fi sound bar
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CONFIDENTIAL
LG Wi-Fi Sound Bar
SERVICE MANUAL
MODEL: SKC9
(SKC9, SPK8-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN78474410
MAY, 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 SKC9

  • 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

    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 © 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

    NAME OF EACH COMPONENT • Front Panel Front panel D The buttons are located on the rear. The buttons are located on the rear. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 HDMI IN p / o (Play/Pause) Starts playback. / Pauses playback Selects Wi-Fi function. B USB (Service only) C LAN port D PORTABLE IN connector Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: 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 9: 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 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: 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 > 1-10 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 12: 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 1-11 Copyright © 2018 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 © 2018 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 © 2018 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 2. HOW TO DISASSEMBLE THE SUBWOOFER ..................2-15 EXPLODED VIEWS ............................2-19 1. MAIN UNIT SECTION ..........................2-19 2. WIRELESS SUBWOOFER SECTION ....................2-21 3. PACKING ACCESSORY SECTION ....................... 2-23 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 17: Disassembly Instructions

    1) Remove the Sheet (MHK65869201). Assemble with weak torque (2 ~ 3kgf) when reassembling. 2) Remove the 36 Screws (1SSZR-0097X) in the direction of the fi gure. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: How To Disassemble The Main Unit

    4) Flip the hook and disconnect the cable. Cover SMPS Screws 5) Remove the 4 Screws (1SSZR-0097X) in the direction of the fi gure. 6) Remove the Cover SMPS. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 9) Remove the Wire cable. Main chassis Assy Screws 10) Remove the 3 Screws (1SSZR-0097X) in the direction of the fi gure. 11) Remove the Main chassis Assy. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 12) Remove the 3 Screws (1SSZR-0097X) in the direction of the fi gure. 13) Remove the Wireless BT Assy. Chamber L Chamber Center Chamber R 14) Remove the Chamber L / R / Center. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 15) Remove the 2 Screws (1SSZR-0097X) in the direction of the fi gure. Button Assy 16) Remove the Button Assy. 17) Remove the Key PCB. 18) Case Top Assy Remove Completed. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 1-2. Disassemble Main PCB Assy Screws 1) Remove the 2 Screws (1SSZR-0098H) in the direction of the fi gure. Front PCB Assy 2) Remove the Front PCB Assy. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 3) Remove the 5 Screws (1SSZR-0098H) in the direction of the fi gure.  3 Screws on the front and 2 Screws on the back. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Be careful when removing the BtoB connector. Screw Wi-Fi 6) Remove the 1 Screw (1SSZR-0098H) in the direction of the fi gure. 7) Remove the FFC and remove the 2 Wi-Fi. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 8) Main PCB Remove Completed. 1-3. Disassemble Jack PCB Assy Screws 1) Remove the 4 Screws (1SSZR-0098H) in the direction of the fi gure. 2-10 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 Disassemble Jack PCB Assy Screws 2) Remove the 2 Screws (353-022s) in the direction of the fi gure. Jack PCB 3) Jack PCB Remove Completed. 2-11 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 1) Remove the 1 Screw (1SSZR-0098H) in the direction of the fi gure. 2) Remove the Power Cable. SMPS PCB 3) SMPS PCB Remove Completed. 2-12 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Push the whole assy Wire Hook 2) Remove the Gasket Tape. 3) Remove the Wire Hook 4) Push the whole assy and subtract the hook. 2-13 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 5) Remove the FFC cable. Hooks Screw 6) Remove the 1 Screw (1SSZR-0098H) in the direction of the fi gure. 7) Disassemble Board with 2 Hooks. 2-14 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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) 2-15 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 31: 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) 2-16 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 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) 2-17 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 2-18 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 34: Exploded Views

    SAFETY INFORMATION IN SERVICE LITERATURE. A44A A80R HDMI+JACK CABLE4 MAIN WIRELESS CABLE3 CABLE2 Wi-Fi CABLE5 SMPS FRONT A80L LCD01 CABLE6 CABLE1 WIRELESS A80C 2-19 2-20 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 35: Wireless Subwoofer Section

    EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. A900 A900W A45W A54W 300W 2-21 2-22 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 36: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 835 Wall bracket 806 Optical cable 836 Screws (2) 829 Cable tie 900 Remote control 2-23 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 2-24 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 2. MAIN P. C. BOARD DIAGRAM ......................3-23 3. JACK P. C. BOARD DIAGRAM ......................3-27 4. FRONT P. C. BOARD DIAGRAM ......................3-29 5. KEY P. C. BOARD DIAGRAM ......................3-29 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 39: Wiring Diagram

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

  • Page 40: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM 74AHC244 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 41: Power Block Diagram

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

  • Page 42: One Point Repair Guide

    1-1-3. Service hint (Any picture / Remark)     L301 L301     IC300 IC300 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 3) If 5.1 VA is OK, replace FRONT board. 1-2-3. Service hint (Any picture / Remark)   IC303 IC303     L304 L304 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 3) If 12V, VCC_5V OK, replace FRONT board. 1-3-3. Service hint (Any picture / Remark)         CN101 CN101 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 45: Sound

    - If no signal, please replace MAIN board. 2-1-3. Service hint (Any picture / Remark)     CN102 CN102 < MAIN board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 2-2-3. Service hint (Any picture / Remark)     JK201 JK201     FB201 FB201 < JACK board top view > Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 2) If soldering status and 5.1 VA are abnormal, replace JACK board. 2-3-3. Service hint (Any picture / Remark)     IC803 IC803 IC800 IC800 < JACK board top view > 3-10 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 48       FB203 FB203 FB202 FB202 IC200 IC200 < JACK board top view > < JACK board bottom view > 3-11 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Protection Error

    3) If AMP IC out is ok and speaker out has DC voltage, replace MAIN board. 3-1-3. Service hint (Any picture / Remark) CN702 CN702 CN701 CN701 CN700 CN700 < MAIN board top view > 3-12 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 3) If check point 1), 2) is ok, replace MAIN board. 3-2-3. Service hint (Any picture / Remark) IC710 IC710 IC707 IC707 IC708 IC708 IC706 IC706 < MAIN board top view > 3-13 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 2) If 20 V is OK, replace MAIN board. 3-3-3. Service hint (Any picture / Remark) IC710 IC710 IC707 IC707 IC708 IC708 IC706 IC706 < MAIN board top view > 3-14 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 52: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL Fig 1-1. Crystal Fig 1-2. Crystal X501 (27 MHz) X801 (27 MHz) 3-15 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 53: Flash

    CRYSTAL 2. FLASH Fig 1-3. Crystal Fig 2. Flash X603 (12.288 MHz) VCC/ CS#/ CLK/ DO 3-16 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 54: 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 3-2. Remote Control Low Timing 3-17 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 55: Optical

    4. OPTICAL Fig 4-1. Optical Fig 4-2. Optical Opt In Opt Det 3-18 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 56: Circuit Voltage Chart

    CN104 (PIN1) 3.0 V ~ 3.6 V 3.344 V 3.349 V 18, 19, 31, 32 PVCC 4.5 V ~ 26 V 22.98 V 3-19 3-20 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 57: Printed Circuit Board Diagrams

    1. SMPS P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-21 3-22 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 2. MAIN P. C. BOARD DIAGRAM (TOP VIEW) 3-23 3-24 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 59: Main P. C. Board Diagram

    MAIN P. C. BOARD DIAGRAM (BOTTOM VIEW) 3-25 3-26 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 60: Jack P. C. Board Diagram

    3. JACK P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-27 3-28 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 61: Front P. C. Board Diagram

    4. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 5. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-29 3-30 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 63: 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 64: 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 65: 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 66 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 67: 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 68: 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 69: 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 70: 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 71: Pwm

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

  • Page 72: Led

    6. LED FIG 6-2. Pairing On Status  Green LED FIG 6-1. Pairing Off Status  Red LED 4-11 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 73 4-12 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 74: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 75: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 76 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 77: Wiring Diagram

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

  • Page 78: 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 79: 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 80 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 81: 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 82: 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 83 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 84: 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 © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 85: Wireless Receiver Amp P. C. Board

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

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