LG SP8YA Service Manual Download Page 74

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Only for training and service purposes.

PRINTED CIRCUIT BOARD DIAGRAMS

1. WIRELESS RECEIVER SMPS P. C. BOARD

(TOP VIEW)

(BOTTOM VIEW)

5-7

5-8

NOTE)

Warning

Parts that are critical with respect to risk
of fire or electrical shock.

Summary of Contents for SP8YA

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: ...TENTS PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES WIRELESS SUBWOOFER CONNECTION 1 5 WOOFER REAR PAIRING METHOD 1 6 HIDDEN KEY MODE 1 7 FIRMWARE UPDATE GUIDE 1 8 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: ...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 7: ...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 8: ...rsion is displayed when press Remocon Select key M MICOM PQ PEQ B Main APK No Alphabet Main Android 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 Woofer Rear Speaker Reset Soundbar Volume key and Remocon MUTE for 3sec Volume must be Min 0 before input those keys Woofer Rear Speaker must Power Off before input those keys Woofer and Rear Speaker can...

Page 9: ...LG Wi Fi Speaker App Caution Take care not to power off during update Do format USB memory before update FAT32 file system FIRMWARE 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 Speaker Unit Optional as model suffix If wireless rear rx module is updated Smart Phone for OOBE update LG ...

Page 10: ... Wireless Rear Tx REARTX_SP8_ BIN REARTX_SP8_BAR_194006__PRO1_CHECKSUM_ BEA0 bin Wireless Rear Rx REARRX_SP8_ BIN REARRX_SP8_BAR_185001_PRO1_CHECKSUM_ DFDF bin MEQ MEQ_SP8_ BIN MEQ_SP8_WSB_20012874_113652 BIN PEQ PEQ_SP8_ BIN PEQ_SP8_171016 bin Step 2 Copy all updated SP8 binaries to USB memory Step 3 Power on SP8 main unit Step 4 If there is an updated wireless subwoofer rx binary in update list ...

Page 11: ... will display REMOVE If you detach the USB disk from USB slot update will start automatically OUT READ REMOV E scroll Update module VFD display Model B E SP8 MICOM SP8 Touch SP8 Wireless Subwoofer Tx SP8 Wireless Subwoofer Rx SP8 Wireless Rear Tx SP8 Wireless Rear Rx SP8 Wireless Rear L Tx Wireless Rear L Rx Wireless Rear R Tx Wireless Rear R Rx MEQ PEQ B UPD ATE scroll T UPD ATE scroll M UPD ATE ...

Page 12: ...reless Subwoofer Tx SP8 Wireless Subwoofer Rx SP8 Wireless Rear Tx SP8 Wireless Rear Rx SP8 Wireless Rear L Tx Wireless Rear L Rx Wireless Rear R Tx Wireless Rear R Rx Touch SP8 PQ2010210 6326 B2011250 1 44 219548 MQ2010229 TX210002 RX201005 RT214002 RR205010 BT214202 AT214102 BR205210 AR205110 T2001075 PLEAS E WAITscroll USB 2 SP8 shows the version of all modules in the order shown below The orde...

Page 13: ...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 Step 3 Open LG Wi Fi Speaker App Step 4 Set up SP8 using LG Wi Fi Speaker App ...

Page 14: ... update server has uploaded the latest version that requires an update the SP8 will automatically proceed with the update at this step If the SP8 is already the latest version App shows SP8 without update step Step 6 At the end of the update step LG App shows the SP8 on device list 8SGDWLQJ 8S SGDWLQJ J B UPD M UPD ATE scroll ATE scroll PLEAS E WAITscroll WI FI ...

Page 15: ...lso provided by Google Home App But LG does NOT recommend using Google Home App to setting up a network 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 Step 2 Power on SP8 main unit Step 3 Open Google...

Page 16: ... App 5220 Step 5 If the update server has uploaded the latest version that requires an update the SP8 will automatically proceed with the update at this step If the SP8 is already the latest version network setup will be finish without update B UPD M UPD ATE scroll ATE scroll PLEAS E WAITscroll WI FI 8SGDWLQJ 5220 6SHDNHU ...

Page 17: ...Copyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes OOBE update Google Home App Step 6 At the end of the update step on Google Home App the network setup is complete ...

Page 18: ...Output Total 440 W RMS Front 40 W RMS x 2 4 Ω at 1 kHz THD 10 Center 40 W RMS 4 Ω at 1 kHz THD 10 Top 50 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 RM...

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 SP8 SECTION 2 9 2 WIRELESS SUBWOOFER SPP8 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: ...y 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 MAIN AMP H G K J I C D E F A CABLE1 CABLE2 CABLE3 A46 A47 A54 263 262 A51 A54 A43 LCD801 266 L 268 A41 EXPLODED VIEWS 1 MAIN UNIT SP8 SECTION ...

Page 29: ...ll Module RxTx WL1NB6V2_ETWADYEC01 0DBM 0DB 0 A80C ABQ77060902 Case Assembly SL8 Chamber Center A80L ABQ77100408 Case Assembly SP8YA Front L New 2 5in WF A80R ABQ77100508 Case Assembly SP8YA Front R New 2 5in WF INDIVIDUAL PARTS 262 MCQ70767102 Damper CUTTING THERMOPLASTIC HOME THE OR 262 MCQ62096433 Damper CUTTING THERMOPLASTIC DVD NB45 263 MCQ70767103 Damper CUTTING THERMOPLASTIC HOME THE OR 263...

Page 31: ...Logo SP8YA DUS 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...

Page 32: ...e purposes 833 AC adapter 836 Screws 2 835 Wall bracket 900 Remote control 300 Power cord Main unit 806 Optical cable Power cord Woofer 300W 803C Woofer packing 804 802A Accessory box 803G Set pad Set bag 803 Main packing 802 Box 803A Woofer pad 804A Woofer bag 3 PACKING ACCESSORY SECTION ...

Page 33: ...e drawing 803C MFZ67251201 Packing MOLD PULP SPK sp8 swf packing 803G MFZ66293023 Packing BOX DW3 3 refer to the drawing 804 MAF66405303 Bag CUTTING LDPE 1190 300 0 3MM 804A MAF66405202 Bag CUTTING EPE 680 660 0 03 PE HD HD 806 EAD61071210 Cable Assembly OPTICAL 1P OPTICAL OPTICAL 150 OR 806 EAD63345601 Cable Assembly POF1 BB2B 1500 02 OPTICAL OPTI OR 806 EAD63727901 Cable Assembly 210 26424 OPTIC...

Page 34: ...NO BOOTING WHEN YOU TURN THE UNIT ON NO MESSAGE OR HELLO ON FRONT PANEL 3 4 2 NO SOUND 3 7 3 PROTECTION ERROR 3 11 WAVEFORMS OF MAJOR CHECK POINT 3 14 1 CRYSTAL 3 14 2 REMOTE CONTROL 3 15 3 OPTICAL 3 16 CIRCUIT VOLTAGE CHART 3 17 PRINTED CIRCUIT BOARD DIAGRAMS 3 19 1 MAIN P C BOARD DIAGRAM 3 19 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 ...

Page 35: ...Only for training and service purposes CN201 CN601 1 UP CN100 1 800 3 CN101 1 8JSFMFTT PEVMF 8JSFMFTT PEVMF 3 3 CN401 CN103 CN105 CNF01 1 UP 1 H E L L O 30 5 1 3 109 5 Y 1 BSOFTT 8J J PEVMF CNM01 1 CN209 1 1 3 109 5 Y 1 3 109 5 Y 506 1 3 109 5 Y WIRING DIAGRAM ...

Page 36: ...0 AOSDATA1 AOSDATA2 AOSDATA3 AOSDATA4 SPDIF 015 5 1 1 01 65 1 5 1 1 6 5 1 1 5 345 MICOM 3 3VA 80p 5 4 JD Touch MIC PCB 1 5ZQF ADAU 7002 I2S_DAT 4 3 Rear Kit Rear Module RX Wireless Woofer Module TX S Flash 1MB SPI Wireless Woofer Wireless Module RX S Flash 1MB Wi l Wireless Woofer Module TX SPI 48 1 1 AMP 3 1 2CH TL FL LPF LPF C FR LPF LPF TR LPF AMP AMP AMP PWM 5CH 3 3V 4 8 3 4 3 3 4 3 0 6 3 33 4...

Page 37: ...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 38: ...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 39: ...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 40: ... 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 41: ...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 42: ...EPAIR 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 43: ...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 44: ... 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 45: ... 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 3 Service hint Any pi...

Page 46: ...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 47: ...4 Copyright 2021 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 48: ...service 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 4 0 ms 7 0 ms High Timing 4 45 ms 3 9 ms 5 5 ms ...

Page 49: ... FET SWITCH A H L B1 DGND JK202 1 VOUT 2 GND 3 VCC R257 560 C283 100pF L200 DGND C280 10uF C281 100nF R256 33 C282 15pF 3 3VA OPT_DET M_OPT_IN IC203 1 B1 2 GND 3 B0 4 A 5 VCC 6 SELECT 3 3V_OPT DGND 3 3V_OPT C290 100nF DGND USB_EN R294 4 7K R295 10K NC MT8531 MICOM OPTICAL 3 OPTICAL Fig 3 2 Optical Opt Det Fig 3 1 Optical Opt In 6 7 ...

Page 50: ...DO Voltage Regulator EAN64395201 VIN 2 3 to 6V VOUT ADJ 1 05V VIN 3 402 VOUT 1 052 No Symbol Spec V mW Measured voltage V 20 IC404 IC Signal Bridge EAN64389101 IOVDD 1 62 to 3 6 IOVDD 1 823 21 IC501 IC Digital Signal Processors EAN65999301 VCC33IO 0 3 to 3 46V VCC18IO 0 3 to 1 89 DVDD_CORE 0 3 to 1 05 DDRV DDR3 0 4 to 1 57 AVDD33 0 3 to 3 45 AVDD18 0 3 to 1 89 AVDD105 0 3 to 1 10 VCC33IO 3 380 VCC...

Page 53: ...opyright 2021 LG Electronics Inc All rights reserved Only for training and service purposes 3 24 3 23 3 FRONT LED P C BOARD DIAGRAM 4 MIC TOUCH P C BOARD DIAGRAM TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 54: ...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 55: ... 2 Copyright 2021 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 56: ...ht 2021 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 57: ...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 58: ...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 59: ...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 60: ...2021 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 61: ...Copyright 2021 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 11 Copyright 2021 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 66: ... 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 67: ... 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 68: ...ce 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 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 ...

Page 69: ...Copyright 2021 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 70: ...ght 2021 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 71: ...termeasure Check LED color of RX BOX Try to remate or reset Color is yellow Replace SMPS board YES NO 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 RIC307 RIC307 RIC307 AMP board top view NO Replace AMP board Check Module or connection YES Replace SMPS board 5...

Page 72: ... connection Check Module or 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 RIC307 3 3 V RIC307 pin3 no output YES YES YES YES YES YES NO NO NO NO NO No Pairi...

Page 74: ...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 7 5 8 NOTE Warning Parts that are critical with respect to risk of fire or electrical shock ...

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