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SERVICE MANUAL

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

MODEL: SN8YG (SN8YG, SPN8-W)

P/NO : AFN30014509

FEBRUARY, 2020

MODEL: SN8YG

(SN8YG, SPN8-W)

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

Wi-Fi Sound Bar

“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.”

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Summary of Contents for SN8YG

Page 1: ...ice purposes Wi Fi Sound Bar 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 include...

Page 2: ...ectronics Inc All rights reserved Only for training and service purposes CONTENTS SECTION 1 GENERAL SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 WIRELESS SUBWOOFER PART SECTION 5 WIRELESS RECEIVER PART OPTION ...

Page 3: ...INES FOR AUDIO PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES NAME OF EACH COMPONENT 1 5 WIRELESS SUBWOOFER CONNECTION 1 7 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 17 ...

Page 4: ...ign Be sure that the safety purpose of the polarized line plug has not been defeated 3 Soldering must be inspected to discover possible cold solder joints solder splashes or sharp solder points Be certain to remove all loose foreign particles 4 Check for physical evidence of damage or deterioration to parts and components for frayed leads or damaged insulation including the AC cord and replace if ...

Page 5: ... more than 1Mohm Note 1 Accessible Conductive Parts include Metal panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and se...

Page 6: ... Wired LG TV HDMI IN HDMI USB USB Note You can use Bluetooth function after making Wi Fi network connection by using Google Home app Volume Adjusts volume level Starts playback Pauses playback Mic mute Disables the detect voice recognition by pressing All the Google Assistant LED turns amber and The mic is muted is heard To cancel it press again Google Assistant LED turns off and The mic is back o...

Page 7: ...ect 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 1 3 2 4 5 Google Assistant LED Changes LED status according to Google Assistant performance LED Status Description All four LEDs are on Ready to listen to your voice command All four LEDs blink Responds to your voice command Microphone is off and ...

Page 8: ...ubwoofer does not make sound To solve the problem follow the steps below 1 Press Pairing on the rear of the wireless subwoofer The green LED on the rear of the wireless subwoofer blinks quickly If the green LED does not blink press and hold the Pairing 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 Note It takes a fe...

Page 9: ... Color Status Yellow green Blink The connection is trying Yellow green The connection is completed Red The wireless receiver is in standby mode or the connection is failed Off No display The power cord of wireless receiver is disconnected Setting up the wireless receiver for the first time 1 Connect the power cord to the wireless receiver to the outlet 2 Turn on the main unit The sound bar and wir...

Page 10: ...out 2 3 seconds on Remocon and then will display WL RESET on LCD 3 Press paring key on the Subwoofer and Rear kit 4 When woofer and rear kit attempt to connect wireless the Green color LED blink faster than standby status 5 When woofer and rear kit connect wireless completely the LED will maintain Green color WOOFER REAR PAIRING METHOD Remocon Rear kit front Mute Key Paring Key Standby LED Subwoof...

Page 11: ...TX Woofer TX RX Woofer RX D DSP H HDMI RR Rear RX RT Rear TX T Touch L Sub MICOM MICOM DSP PEQ 3 Option Change Soundbar Volume key and Remocon for 3 seconds B skip and F Skip can change Option Number Play Pause key can change Option Value Remocon Info key can save a modified Option and Reboot 4 Woofer Rear Speaker Reset Soundbar Volume key and Remocon MUTE for 3sec Volume must be Min 0 before inpu...

Page 12: ... kit optional 2 RCU 3 USB Memory Caution Take care not to power off during update Do format USB memory before update FAT32 file system SOFTWARE UPDATE GUIDE Main Unit Necessary RCU Necessary Wireless Subwoofer Unit If wireless subwoofer rx module of primary unit is updated USB Memory for USB update Rear L R Speaker Unit Rear kit Speaker Unit Optional as model suffix If wireless rear rx module is u...

Page 13: ...R Tx SN11 REARRTX_SN11_ BIN REARRTX_SN11_WSB_204206_191213_Checksum_D26E bin Wireless L Rx SN11 REARLRX_SN11_ BIN REARLRX_SN11_WRK_205110_200102_Checksum_75A2 bin Wireless R Rx SN11 REARRRX_SN11_ BIN REARRRX_SN11_WRK_205210_200102_Checksum_69B2 bin MEQ MEQ_SNx_WSB_ BIN MEQ_SN11_WSB_19122763_095858 BIN PEQ PEQ_SNx_WSB_ BIN PEQ_SN11_WSB_1911150_6326 bin TOUCH TOUCH_SNx_ BIN TOUCH_SN11_191211_0xF621 ...

Page 14: ...ically after update finish Step 10 Power on SN11 s main unit again Step 11 Check the current versions to verify whether the update was successfully completed or not 1 Press Version Check hidden key Version Check Hidden Key Press Set Vol RCU Play Pause for 3secs Update module VFD display MAIN MICOM SUB MICOM Wireless Subwoofer Tx Wireless Subwoofer Rx Wireless Rear Tx Wireless Rear Rx Wireless L Tx...

Page 15: ...ompare the version VFD shows and you updated Module VFD display sample MICOM PEQ MAIN GVA MEQ Wireless Subwoofer Tx Wireless Subwoofer Rx Rear L Tx Rear L Rx Touch Sub Micom Rear R Tx Rear R Rx Option M1912247 PQ1812030 6326 B1901140 1 40 168834 MQ161221 TX190007 RX191008 AT2041050 AR2041050 BT2041050 T1910111 BR2041050 L1912160 00 75 05 93 SN11 s VFD Display in Version Display ...

Page 16: ...onics Inc All rights reserved Only for training and service purposes 3 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 ...

Page 17: ... training and service purposes Using APP Step 3 System compare current version with the latest version at server Step 4 If there is new version on server press Update Step 6 Updating Step 7 After update finish application show the result Step 5 Update file downloading ...

Page 18: ...ut Total 440 W RMS Front 50 W RMS x 2 4 Ω at 1 kHz THD 10 Center 40 W RMS 4 Ω at 1 kHz THD 10 Top 40 W RMS x 2 4 Ω at 1 kHz THD 10 Subwoofer 220 W RMS 3 Ω at 80 Hz THD 10 WIRELESS SUBWOOFER Power requirements Refer to the main label on the subwoofer Power consumption Refer to the main label on the subwoofer Type 1 Way 1 Speaker Impedance 3 Ω Rated Input Power 220 W RMS Max Input Power 440 W RMS Di...

Page 19: ...1 18 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 20: ...ervice purposes SECTION 2 CABINET MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS 2 2 1 HOW TO DISASSEMBLE THE MAIN UNIT 2 2 2 HOW TO DISASSEMBLE THE SUBWOOFER 2 6 EXPLODED VIEWS 2 9 1 MAIN UNIT SN8 SECTION 2 9 2 WIRELESS SUBWOOFER SPN8 W SECTION 2 13 3 PACKING ACCESSORY SECTION 2 17 ...

Page 21: ...MBLE THE MAIN UNIT Figure 1 1 1 1 Disassemble of Case Bottom Disassemble Red points Screw 1SSZR 0097X 24 EA Disassemble Screw 1SSZR 0097X 24 EA Figure 1 2 1 1 2 Disassemble Main PCB and Frame 1 Disassemble Case 3 Point Figure 1 2 2 2 Disassemble Screw 2 Point Disassemble Red points Screw 1SSZR 0098H 2 EA Disassemble Screw 1SSZR 0098H 2 EA ...

Page 22: ...E MAIN UNIT Figure 1 3 1 3 Disassemble Chamber Figure 1 4 1 4 Disassemble Main PCB and AMP PCB Disassemble Red points Screw 1SSZR 0098H 2 EA Disassemble Screw 1SSZR 0098H 2 EA Figure 1 5 1 1 5 Disassemble PCB 1 Disassemble Front PCB Screw Disassemble Red points Screw 1SSZR 0098H 2 EA Disassemble Screw 1SSZR 0098H 2 EA ...

Page 23: ...ng and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Figure 1 6 1 1 6 Disassemble Main PCB Disassemble screw 2 Point of red mark Figure 1 5 2 Figure 1 6 2 2 Disassemble Main PCB and Amp PCB Disassemble Cable 4 Point of red mark Disassemble Red points Screw 234 022S 2 EA ...

Page 24: ... reserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Figure 1 7 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 ...

Page 25: ... reserved Only for training and service purposes Rear Panel Assembly SPK cable Figure 2 1 1 Figure 2 1 2 2 HOW TO DISASSEMBLE THE SUBWOOFER 2 1 Rear Panel Assembly 1 Remove the 11 screws 2 Pull out the Rear Panel Assembly and disconnect the SPK cable ...

Page 26: ...dule 1 Disconnect the FFC cable 2 Remove the EVA sheet 0 15T covered the WIRELESS module 3 Remove the WIRELESS module 4 Remove the EVA gasket 1 0T covered the WIRELESS module Caution when assembling the WIRELESS Module 1 Attach the EVA gaskets 1 0T to both sides of the WIRELESS module 2 Assemble the WIRELESS module into the wireless holder 3 Attach the EVA sheet 0 15T to the WIRELESS module 4 Conn...

Page 27: ... rights reserved Only for training and service purposes 1 2 Figure 2 3 1 Figure 2 3 2 HOW TO DISASSEMBLE THE SUBWOOFER 2 3 AMP SMPS PCB Assembly 1 Disconnect the Power inlet socket cable 2 Remove the 5 screws 3 Remove the AMP SMPS PCB Assembly ...

Page 28: ...nly for training and service purposes 2 10 2 9 A K E L C D J F H A80L G A80R A42 I A80C WIRELESS FRONT WIRELESS CABLE5 A41 MAIN AMP H G K J I C D E F A CABLE1 CABLE2 CABLE3 A46 A47 A54 263 262 A51 A54 A43 266 L LCD801 EXPLODED VIEWS 1 MAIN UNIT SN8 SECTION ...

Page 29: ...5VTO3 6V A54 EAT63117401 Module RF Full Module RxTx WL1NB6 TWBI H002D 0DBM 0DB 0 OR A54 EAT63117404 Module RF Full Module RxTx WL1NB6_ 0DBM 0DB 0 0A 0A 0DB A80C ABQ77060902 Case Assembly SL8 Chamber Center A80L ABQ77100402 Case Assembly SL8 Add EVA Chamber Top Front A80R ABQ77100502 Case Assembly SL8 Add EVA Chamber Top Front INDIVIDUAL PARTS 262 MCQ62096433 Damper CUTTING THERMOPLASTIC DVD NB45 2...

Page 30: ...Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 2 14 2 13 B A 954 951 A45W A B A54W 953 961 A900 2 WIRELESS SUBWOOFER SPN8 W SECTION ...

Page 31: ...US A45W EBR89625801 PCB Assembly SPN8 W SPN5B W Woofer AMP SMPS A54W EAT63117401 Module RF Full Module RxTx WL1NB6 TWBI H002D 0DBM 0DB 0 OR A54W EAT63117404 Module RF Full Module RxTx WL1NB6_ 0DBM 0DB 0 0A 0A 0DB 951 AGL77272902 Panel Assembly Rear SPK7 W WW COMMON_SL10YG DDVEVN 953 EAD62131521 Cable FFC 26P005D H1 1F01A T 60 60 0 0 0 954 EAG63233208 Socket Power DAC 18JN08 2P STRAIGHT WIRE BK 961...

Page 32: ...tronics Inc All rights reserved Only for training and service purposes 833 AC adapter 836 Screws 2 835 Wall bracket 900 Remote control 806 Optical cable 300 Power cord Main unit Power cord Woofer 300W 3 PACKING ACCESSORY SECTION ...

Page 33: ...AD61071210 Cable Assembly OPTICAL 1P OPTICAL OPTICAL 150 OR 806 EAD61071209 Cable Assembly OPTICAL 1P OPTICAL OPTICAL 250 OR 806 EAD63727901 Cable Assembly 210 26424 OPTICAL OPTICAL 1 5M OR 806 EAD63345601 Cable Assembly POF1 BB2B 1500 02 OPTICAL OPTI w 833 EAY62909702 Adapters DA 50F25 AAAA 100 240Vac 25Vdc 835 AAA77508401 Accessory Assembly SPK SK9Y SK10Y Wallmount Brack 836 AGG75620751 Packing ...

Page 34: ...E POINT REPAIR GUIDE 3 5 1 NO BOOTING WHEN YOU TURN THE UNIT ON NO MESSAGE OR HELLO ON FRONT PANEL 3 5 2 NO SOUND 3 8 3 PROTECTION ERROR 3 12 WAVEFORMS OF MAJOR CHECK POINT 3 15 1 CRYSTAL 3 15 2 REMOTE CONTROL 3 16 3 OPTICAL 3 17 CIRCUIT VOLTAGE CHART 3 19 PRINTED CIRCUIT BOARD DIAGRAMS 3 21 1 MAIN P C BOARD DIAGRAM 3 21 2 AMP P C BOARD DIAGRAM 3 23 3 FRONT LED P C BOARD DIAGRAM 3 25 4 MIC TOUCH P...

Page 35: ...3 2 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes WIRING DIAGRAM ...

Page 36: ...TA0 AOSDATA1 AOSDATA2 AOSDATA3 AOSDATA4 CEC SPDIF OPT_DET AMP_PDN OP_MUTE AMP_TEMP AMP_FAULT AMP_CLIP0 MT8531_RST MICOM 3 3VA 100p TMDS DDC Mic 2 EA Touch MIC PCB SPH0641LM4H 1 PDM_Type ADAU 7002 I2S_DAT ADAU On Off M_I2S_BCK LRCK Rear Kit Rear Module RX Rear Module TX 5G S Flash 1MB SPI Wireless Woofer Wireless Module RX S Flash 1MB Wireless Module TX 5G SPI SWF AMP PCB AMP 3 1 2CH TL FL LPF LPF ...

Page 37: ...91mA PWM_3 3V 80mA Clip Detect S F RBOX_R GD25Q80CSIG S F SW GD25Q80CSIG SY6288C3 LR1148G HD_3 3V 41mA eARC_1 2V 44mA HDMI JACK eARC Sil9437 MIC PCBA FRONT PCBA GLEDx4 LCD_5V USB JACK Wifi BT module SWF W L Module RBOX_module 5 1VA 1847mA TR Switching LR1148G WI SY8089A1 2 5 5 5V 2A BUZZER CEC 20mA DDR3 x 2 MP9453 4 2 17V 3A LR1148G LR1148G D_3 3V 5mA S W IC DC DC LDO MICOM Sub R5F100GEAFB 30 Opti...

Page 38: ...t no message on the front panel and LED doesn t work 1 1 IC604 System 12 VA No 12 VA 1 1 1 Solution Replace AMP board 1 1 2 How to troubleshoot Countermeasure 1 Please check 25 VA of IC604 pin2 VIN 2 If 25 VA is abnormal please check adapter 3 If 25 VA is OK but 12 VA is abnormal pin3 of IC604 VOUT replace AMP board 1 1 3 Service hint Any picture Remark AMP board top view IC604 IC604 IC604 IC604 L...

Page 39: ...n you turn on your set no message on the front panel and LED doesn t work 1 2 IC303 System 3 3 VA No 3 3 VA 1 2 1 Solution Replace MAIN FRONT board 1 2 2 How to troubleshoot Countermeasure 1 Please check 3 3 VA of IC303 pin2 2 If 3 3 VA is abnormal replace MAIN board 3 If 3 3 VA is OK replace FRONT board 1 2 3 Service hint Any picture Remark MAIN board top view IC303 IC303 IC303 IC303 L317 L317 ...

Page 40: ...oesn t work 1 3 LCD System power VCC_5 V 3 3 VA No 5 V 3 3 VA 1 3 1 Solution Replace MAIN FRONT board 1 3 2 How to troubleshoot Countermeasure 1 Please check VCC_5V at TP142 1 a If VCC_5V is abnormal replace MAIN board 1 b If VCC_5V is OK replace FRONT board 2 Please check VCC_5V at TP149 1 a If 3 3 VA is abnormal replace MAIN board 1 b If 3 3 VA is OK replace FRONT board 1 3 3 Service hint Any pi...

Page 41: ... Bluetooth module MAIN board 2 1 2 How to troubleshoot Countermeasure 1 Please check status of Wi Fi Bluetooth cable connection at CN209 and module 2 Please check WIFI_3 45 V at pin1 7 12 of CN209 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 MAIN board top view CN209 CN209 ...

Page 42: ...T REPAIR GUIDE NO SOUND 2 2 OPTICAL 2 2 1 Solution Replace MAIN board 2 2 2 How to troubleshoot Countermeasure 1 Please check 3 3 VA at L200 of JK202 2 If 3 3 VA is OK please check OPT_IN signal R257 when optical mode 3 If signal abnormal replace MAIN board 2 2 3 Service hint Any picture Remark JK202 JK202 R257 R257 L200 L200 ...

Page 43: ...REPAIR GUIDE NO SOUND 2 3 HDMI 2 3 1 Solution Replace MAIN board 2 3 2 How to troubleshoot Countermeasure 1 Please check soldering status of HDMI jack and check HDMI_5 V at IC804 pin6 2 If soldering status and HDMI_5 V FL809 are abnormal replace MAIN board 2 3 3 Service hint Any picture Remark IC804 IC804 IC804 IC804 FL809 FL809 ...

Page 44: ...POINT REPAIR GUIDE NO SOUND 2 4 USB 2 4 1 Solution Replace MAIN board 2 4 2 How to troubleshoot Countermeasure 1 Please check soldering status of USB_5 V at JK201 pin1 2 If soldering status and USB_5 V are abnormal replace MAIN board 2 4 3 Service hint Any picture Remark MAIN board top view JK201 JK201 ...

Page 45: ... display or No Sound 3 1 D DC PROTECTION 3 1 1 Solution Replace AMP board 3 1 2 How to troubleshoot Countermeasure 1 Check DC voltage of speaker out FL Top L CN703 pin1 2 3 4 C CN702 pin1 2 FR TOP R CN704 pin1 2 4 5 3 1 3 Service hint Any picture Remark AMP board top view CN702 CN702 CN702 CN702 CN703 CN703 CN704 CN704 CN703 CN703 CN704 CN704 ...

Page 46: ...ountermeasure 1 Check PVDD voltage 25 V of IC700 IC701 IC702 pin29 30 31 36 37 38 If PVDD voltage has 8 5 V under refer to STEP 1 1 2 Check GVDD VDD voltage 12 V of IC700 IC701 IC702 pin1 2 22 If GVDD VDD voltage has 8 5 V under refer to STEP 1 1 3 Check impedance 4 Ω of speaker unit If impedance of speaker unit has 1 Ω under replace speaker unit 4 If check point 1 2 3 is OK replace AMP board 3 2 ...

Page 47: ...IC700 ONE POINT REPAIR GUIDE PROTECTION ERROR No display or No Sound 3 3 B BURNT PROTECTION 3 3 1 Solution Replace AMP board 3 3 2 How to troubleshoot Countermeasure 1 Check GVDD VDD voltage 12 V of IC700 IC701 IC702 pin1 2 22 If GVDD VDD voltage has 8 5 V under refer to STEP 1 1 2 If 12 V is OK replace AMP board 3 3 3 Service hint Any picture Remark ...

Page 48: ...5 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 1 WAVEFORMS OF MAJOR CHECK POINT 1 CRYSTAL Fig 1 2 Crystal X501 27 MHz Fig 1 1 Crystal XA601 24 576 MHz 1 2 2 ...

Page 49: ...ervice purposes 5 3 4 2 REMOTE CONTROL Fig 2 2 Remote Control High Timing Fig 2 1 Remote Control Input Voltage 3 Fig 2 3 Remote Control Low Timing 5 4 Item Measured Spec Input Level 3 3 V IR Receiver Spec 2 7 5 5 V Low Timing 4 56 ms 3 6 ms 5 04 ms High Timing 4 45 ms 4 08 ms 5 04 ms ...

Page 50: ...3 17 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 6 7 3 OPTICAL Fig 3 2 Optical Opt Det Fig 3 1 Optical Opt In 6 7 ...

Page 51: ...3 18 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ... VIN 3 35 VOUT 1 81 17 IC320 LDO Voltage Regulator EAN64395201 VIN 2 3 to 6 V VOUT ADJ 1 8 V VIN 3 39 VOUT 1 81 18 IC321 LDO Voltage Regulator EAN64395201 VIN 2 3 to 6 V VOUT ADJ 1 2V VIN 3 35 VOUT 1 81 19 IC322 LDO Voltage Regulator EAN64395201 VIN 2 3 to 6 V VOUT ADJ 1 8 V VIN 3 38 VOUT 1 84 20 IC401 AEC DVDD18 0 3 to 2 1 AVDD18 0 3 to 2 1 DVDD28 for 1 8V IO 0 3 to 2 1 DVDD28 for 3 3V IO 0 3 to ...

Page 53: ...Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 3 22 3 21 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 54: ...Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 3 24 3 23 2 AMP P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 55: ...opyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 3 26 3 25 3 FRONT LED P C BOARD DIAGRAM 4 MIC TOUCH P C BOARD DIAGRAM TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 56: ...NTENTS WIRING DIAGRAM 4 2 BLOCK DIAGRAM 4 3 ONE POINT REPAIR GUIDE 4 4 1 POWER ON ERROR 4 4 2 WIRELESS CONNECTION 4 6 WAVEFORMS OF MAJOR CHECK POINT 4 7 1 CRYSTAL 4 7 2 FLASH MEMORY 4 7 3 VOLTAGE 4 8 4 AMP VOLTAGE 4 9 5 PWM 4 10 6 LED 4 11 CIRCUIT VOLTAGE CHART 4 13 PRINTED CIRCUIT BOARD DIAGRAMS 4 15 1 WOOFER SMPS AMP P C BOARD 4 15 ...

Page 57: ... 2 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 2P 3 96mm ST Non Lock SMD 26P 0 5mm ST Non Lock SMD Wireless 2P 3 96mm ST Non Lock SMD Power WIRING DIAGRAM ...

Page 58: ...ht 2020 LG Electronics Inc All rights reserved Only for training and service purposes PWM IC Wireless TX Wireless RX FL LPF AMP IC FR LPF AMP_PDN SW SW AMP_SD I2S I2C Reset KEY PAIRING LED RED GREEN BLOCK DIAGRAM ...

Page 59: ...oint then find PVDD at pin7 of WIC704 3 1 2 is NG Replace WIC704 If you can t check PVDD voltage then replace the PCB board 1 2 3 3 VA 1 Check 3 3 VA at WL707 coil 2 If 3 3 VA is not checked at the point then find 12 VA at pin3 of WIC705 3 1 2 is NG Replace WIC705 If you can t check 12 VA voltage refer to the step 1 1 Woofer SMPS AMP board top view Woofer SMPS AMP board top view WL708 WL708 WIC704...

Page 60: ...purposes WIC703 WIC703 ONE POINT REPAIR GUIDE POWER ON ERROR Fundamental power check points 1 3 3 3 VA 1 Check 3 3 VA at pin1 of WIC703 2 Check 3 3V_PWM at pin6 of WIC703 3 1 2 is NG Replace WIC703 If you can t check PVDD voltage then replace the PCB board Woofer SMPS AMP board bottom view ...

Page 61: ...nection closely 2 Implement Wireless Factory Reset MAIN SET Soundbar vol MIN and push Mute key sustain 3 5 seconds Subwofer Press Pairing button on the rear of the wireless subwoofer The LED of of the wireless subwoofer blink red and green pull out power cord The main set and the wireless subwoofer are factory reset mode then power on Woofer SMPS AMP board top view WFB604 WFB604 Wireless module Wi...

Page 62: ...2020 LG Electronics Inc All rights reserved Only for training and service purposes WAVEFORMS OF MAJOR CHECK POINT 1 CRYSTAL 2 FLASH MEMORY FIG 1 WX601 24 576 MHz FIG 2 VCC CS CLK DO 1 2 4 3 5 VCC CS CLK DO 1 2 4 5 3 ...

Page 63: ...Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 3 VOLTAGE FIG 3 2 Woofer 12 VA FIG 3 1 Woofer PVDD 6 7 FIG 3 3 Woofer 3 3 VA 8 FIG 3 4 Woofer 3 3V_PWM 9 7 6 8 9 ...

Page 64: ...4 9 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 4 AMP VOLTAGE FIG 4 2 AMP_12V FIG 4 1 AMP PVDD 10 11 11 10 ...

Page 65: ...4 10 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 5 PWM FIG 5 2 Woofer PWM SW Signal FIG 5 1 Woofer PWM SW Signal 12 13 13 12 ...

Page 66: ...4 11 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 6 LED FIG 6 2 Pairing On Status Green LED FIG 6 1 Pairing Off Status Red LED 14 15 15 14 ...

Page 67: ...4 12 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 68: ... VDD_PLL 1 08 V 1 32 V 1 28 V 1 28 V WIC701 IC Audio Amplifier PVDD 29 30 31 36 37 38 PVDD 12 V 34 V 20 61 V 20 64 V GVDD 1 22 GVDD 10 8 V 13 2 V 12 41 V 12 42 V VDD 2 VDD 10 8 13 2V 12 47 V 12 47 V WIC703 IC Analog Switch VIN 1 VIN 2 8 V 5 5 V 3 42 V 3 42 V VOUT 6 VOUT 2 8 V 5 5 V 3 41 V 3 41 V WIC704 IC DC DC Converter VIN 7 VIN 4 5 V 45 V 34 61 V 34 64 V SW 1 VOUT 0 8 V 42 V 12 53 V 12 53 V WIC...

Page 69: ... All rights reserved Only for training and service purposes 4 16 4 15 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 ...

Page 70: ...e purposes SECTION 5 WIRELESS RECEIVER PART OPTION CONTENTS WIRING DIAGRAM 5 2 BLOCK DIAGRAM 5 3 ONE POINT REPAIR GUIDE 5 4 ELECTRICAL TROUBLESHOOTING GUIDE 5 5 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 ...

Page 71: ...Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes Rear AMP SMPS Wireless RCN301 CN901 RJK301 SPK RR RL 26P FFC R C N 3 0 3 10P Harness SPK terminal WIRING DIAGRAM ...

Page 72: ...ght 2020 LG Electronics Inc All rights reserved Only for training and service purposes PWM IC Wireless TX Wireless RX RL LPF AMP RR LPF AMP_PDN RL RR AMP_SD I2S I2C R Reset KEY PAIRING LED RED GREEN BLOCK DIAGRAM ...

Page 73: ...easure 2 How to Duplicate Problem Wireless rear speaker doesn t output a sound 2 1 Solution Replace AMP board No 12 V 2 2 How to troubleshoot Countermeasure 2 3 Service hint Any picture Remark Check LED color of RX BOX Try to remate or reset Color is yellow Replace SMPS board YES NO RIC307 RIC307 RIC308 RIC308 RIC307 RIC308 AMP board top view NO Replace AMP board Check 3 3 V YES Replace SMPS board...

Page 74: ...less rear speaker doesn t output a sound 3 1 Solution Replace AMP board No 3 3 V 3 2 How to troubleshoot Countermeasure 3 3 Service hint Any picture Remark RIC307 RIC307 RIC308 RIC308 RIC307 RIC308 AMP board top view NO Replace AMP board Check Module or connection YES Replace SMPS board 5 VA RIC307 pin2 no input PWM 3 3 V RIC307 pin3 no output YES NO ...

Page 75: ...r Connection Yellow LED blinks irregularly Sound cut off irregularly Red LED is turned on LED is Red Turn off the equipment that gives interference Turn off the equipment that gives interference interference interference Remate Remate Check SMPS board AMP PVDD RCN301 pin9 10 no output Check RIC308 AMP 12 V RIC308 pin4 no output Check RIC307 3 3 V RIC307 pin3 no output YES YES YES YES YES YES YES N...

Page 76: ... 7 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes RCN303 pin1 I2S LRCK RCN303 pin3 I2S BCK 1 2 WAVEFORMS 1 AUDIO PART I2S RCN303 pin20 I2S Audio Data 3 3 1 2 ...

Page 77: ...5 8 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 78: ...l rights reserved Only for training and service purposes PRINTED CIRCUIT BOARD DIAGRAMS 1 WIRELESS RECEIVER SMPS P C BOARD TOP VIEW BOTTOM VIEW 5 9 5 10 NOTE Warning Parts that are critical with respect to risk of fire or electrical shock ...

Page 79: ...Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes 5 11 5 12 2 WIRELESS RECEIVER AMP P C BOARD TOP VIEW BOTTOM VIEW ...

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