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SERVICE MANUAL

SERVICE MANUAL

CAUTION

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

CONFIDENTIAL

MODEL: SKC9 (SKC9, SPK8-W)

P/NO : AFN78474410

MAY, 2018

MODEL: SKC9

(SKC9, SPK8-W)

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

LG 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 SKC9

Page 1: ...ice purposes LG 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 incl...

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 14 ...

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: ...nts ts bn Qn kzshynts y bmnyj yf nsl ts 5 Yjy twp htssjhynts nx htruqjyji ts bn Qn kzshynts tw ymj tymjw kzshyntsx fwj xjqjhyji y bmnyj Onrrji 5 yfsig rtij nym sjy twp htssjhynts y ji yf nsl ts 5 yfsig rtij nymtzy sjy twp htssjhynts B jrtyj xjsxtw C Onxuqf nsit D The buttons are located on the rear Front panel NAME OF EACH COMPONENT Front Panel The buttons are located on the rear D ...

Page 7: ... uqf gfhp bn Qn jqjhyx bn Qn kzshynts B USB Service only b it sqtfi htssjhytw C LAN port Ntssjhy yt f wtzyjw D PORTABLE IN connector Ntssjhy utwyfgqj ij nhj E OPTICAL IN connector Ntssjhy yt fs tuynhfq ij nhj F HDMI OUT TV ARC Ntssjhy yt SOXT TY L N ts _a G HDMI IN Ntssjhy yt ij nhj nym SOXT Z _ Rear panel Rear Panel Selects the function and input source WI FI OPT HDMI ARC BT LG TV HDMI IN PORTABL...

Page 8: ...e the problem follow the steps below 1 Press Pairing button 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 button 2 Turn on the sound bar 3 Pairing is completed The green LED on the rear of the wireless subwoofer turns on Note It takes a few seconds and may take longer for the main ...

Page 9: ... Status Yellow green Blink The connection is trying Yellow green The wireless receiver is receiving the signal from the sound bar Red The wreless receiver is in standby mode 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 w...

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: ...MEQ T TOUCH Result Scroll SW Version on Soundbar VFD EXIT Press Play Pause on Remocon for 5 seconds MICOM PEQ MAIN DSP 3 OPTION Edit Enter Volume on soundbar with AV SYNC key on remocon for 5 seconds Result VFD display OPTION number and OPTION data like 00 00 02 4A How to Change Option data Change Option data by press PLAY PAUSE on remocon key change option number by press B SKIP on remocon F SKIP...

Page 12: ...mrrrr BIN REARRx REARRX_SK9_yymmrrrr BIN REARTx REARTX_SK9_yymmrrrr BIN 1 2 HOW TO UPDATE Copy Update file to USB Root Directory Turn on soundbar and change function to WIFI Insert USB to USB Port at the back side of soundbar VFD display UPGRADE Play Pause key on remocon or WIFI key on soundbar can start UPDATE After Update finish system will restart automatically If reboot is finish VFD display W...

Page 13: ...onics Inc All rights reserved Only for training and service purposes 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 ...

Page 14: ... 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 15: ...3 W RMS x 2 4 Ω at 1 kHz THD 10 Top 43 W RMS x 2 4 Ω at 1 kHz THD 10 Subwoofer 200 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 200 W RMS Max Input Power 400 W RMS Dimensions W x H x D Approx 221 0 mm x 390 0 mm x 312 8 mm 8 7 i...

Page 16: ...nd service 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 15 EXPLODED VIEWS 2 19 1 MAIN UNIT SECTION 2 19 2 WIRELESS SUBWOOFER SECTION 2 21 3 PACKING ACCESSORY SECTION 2 23 ...

Page 17: ...r training and service purposes 1 HOW TO DISASSEMBLE THE MAIN UNIT 1 1 Disassemble Main set DISASSEMBLY INSTRUCTIONS 1 Remove the Sheet MHK65869201 2 Remove the 36 Screws 1SSZR 0097X in the direction of the figure w Assemble with weak torque 2 3kgf when reassembling ...

Page 18: ... service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main set 3 Disconnect the 3 SPK cables from the Main PCB 4 Flip the hook and disconnect the cable 5 Remove the 4 Screws 1SSZR 0097X in the direction of the figure 6 Remove the Cover SMPS 1 1 SPK cable Screws Cover SMPS ...

Page 19: ...SEMBLE THE MAIN UNIT Disassemble Main set 7 Remove the 2 Gasket Tapes 8 Remove the 2 BT FFC 9 Remove the Wire cable 10 Remove the 3 Screws 1SSZR 0097X in the direction of the figure 11 Remove the Main chassis Assy WIRELESS KEY BT 1 1 BT FFC Wireless FFC Key wire Gasket Tape Gasket Tape Screws Main chassis Assy ...

Page 20: ...aining and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main set 12 Remove the 3 Screws 1SSZR 0097X in the direction of the figure 13 Remove the Wireless BT Assy 14 Remove the Chamber L R Center Chamber R Chamber Center Chamber L Wireless BT Assy Screws ...

Page 21: ...Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main set 15 Remove the 2 Screws 1SSZR 0097X in the direction of the figure 16 Remove the Button Assy 17 Remove the Key PCB 18 Case Top Assy Remove Completed Screws Button Assy ...

Page 22: ...c All rights reserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT 1 2 Disassemble Main PCB Assy 1 Remove the 2 Screws 1SSZR 0098H in the direction of the figure 2 Remove the Front PCB Assy Screws Front PCB Assy ...

Page 23: ...erved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main PCB Assy 3 Remove the 5 Screws 1SSZR 0098H in the direction of the figure 3 Screws on the front and 2 Screws on the back Screws on the front Screws on the back ...

Page 24: ...ce purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main PCB Assy 4 Remove the FFC and remove the Jack Board Assy 5 w Be careful when removing the BtoB connector 6 Remove the 1 Screw 1SSZR 0098H in the direction of the figure 7 Remove the FFC and remove the 2 Wi Fi FFC Wi Fi Screw ...

Page 25: ...ts reserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Main PCB Assy 1 3 Disassemble Jack PCB Assy 8 Main PCB Remove Completed 1 Remove the 4 Screws 1SSZR 0098H in the direction of the figure Main PCB Screws ...

Page 26: ...nics Inc All rights reserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Jack PCB Assy 2 Remove the 2 Screws 353 022s in the direction of the figure 3 Jack PCB Remove Completed Jack PCB Screws ...

Page 27: ...eserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT 1 4 Disassemble SMPS PCB 1 Remove the 1 Screw 1SSZR 0098H in the direction of the figure 2 Remove the Power Cable 3 SMPS PCB Remove Completed SMPS PCB Power Cable pin Screw ...

Page 28: ...ng and service purposes HOW TO DISASSEMBLE THE MAIN UNIT 1 5 Disassemble Wi Fi Assy 1 Remove the 1 Screw 1SSZR 0098H in the direction of the figure 2 Remove the Gasket Tape 3 Remove the Wire Hook 4 Push the whole assy and subtract the hook Screw Wire Hook Push the whole assy ...

Page 29: ...ights reserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Disassemble Wi Fi Assy 5 Remove the FFC cable 6 Remove the 1 Screw 1SSZR 0098H in the direction of the figure 7 Disassemble Board with 2 Hooks FFC Hooks Screw ...

Page 30: ... 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 31: ...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 32: ... 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 33: ...2 18 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ...268 SMPS MAIN I A43 LCD01 H D J HDMI JACK A46 A47 265 A48 G J L B A F E C D CABLE4 266 A44A Wi Fi C 264 263 261 A44 A51 CABLE5 WIRELESS 269 A54 N N M CABLE6 M EXPLODED VIEWS 1 MAIN UNIT SECTION NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE E A80L H 300 F A80C G A80R ...

Page 35: ...e purposes 2 22 2 21 B 956 958 A900 A900W A 954 952 951 A45W A B A54W 953 961 2 WIRELESS SUBWOOFER SECTION NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE 300W ...

Page 36: ...23 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 806 Optical cable 836 Screws 2 835 Wall bracket 900 Remote control 829 Cable tie 3 PACKING ACCESSORY SECTION ...

Page 37: ...2 24 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ...EN 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 FLASH 3 16 3 REMOTE CONTROL 3 17 4 OPTICAL 3 18 CIRCUIT VOLTAGE CHART 3 19 1 ICs 3 19 2 CAPACITORS 3 20 3 CONNECTORS 3 20 PRINTED CIRCUIT BOARD DIAGRAMS 3 21 1 SMPS P C BOARD DIAGRAM 3 21 2 MAIN P C BOARD DIAGRAM 3 23 3 JACK P C BOARD DIAGRAM 3 ...

Page 39: ...le Lock SMD 16 P 2 mm ST Socket SMD S 8 P 2 mm ST SMD 10 P 1 mm ST SMD BT KEY 2 P 1 25 mm Angle SMD 2 P 1 25 mm ST SMD 8 P 1 25 mm ST SMD WIFI 16 P 2 mm Angle Header SMD MAIN PCB Wireless Rear Box 26 P 0 5 mm Angle SMD 26 P 0 5 mm Angle SMD Wireless Subwoofer 30 P 2 mm ST Header SMD 30 P 2 mm ST Socket SMD HDMI PCB HDMI HDMI Ethernet USB OPT O Portable 14 P 0 5 mm Angle Locking SMD m Po o P P P P ...

Page 40: ...IC 2 Color LED FRONT PCB LCD IR Receiver Key PCB 5 Key DDR3 128MB KEY SPI BL_CTL RMC LED I2S SPDIF 32 MICOM IC UART M_RESET S Flash 1MB SPDIF SOC SPI0 USB 24 576M ARC S Flash 1MB ADC PCM1808 M_D0 HDMI IC 74AHC244 D0 MCLK BCK LRCK D_D0 MCLK BCK LRCK SPI H_D0 MCLK BCK LRCK BCK LRCK 24 576M 24 576M 27M 27M DAC IC D_D3 D D DIR IC DDR3 128MB FL TL FR TR SL SR C 40M OP AMP OP AMP OP AMP OP AMP 8 Etherne...

Page 41: ...3V DSP_1 1V DSP_1 5V DSP_3 3V DSP_1 5V DSP_3 3V DAC_1 2V DAC_3 3V DAC_3 3V AMP IC TAS3118 x 4 25VA HDMI 4K HDMI_5 1VA HD_1 0V HD_3 3V ADC DIR VCC_5V D_3 3V D_3 3V OPTICAL PORTABLE HDMI IN HDMI OUT 3 3VA VCC_5V DCDC 12 VA 5 1VA 12 VA DCDC 25VA 12VA SW SMPS FRONT PCB JACK PCB LDO 5 1 VA DAC_3 3V LDO DAC_3 3V DAC_1 2V LDO 5 1 VA 3 3VA DSP_3 3V SW D_3 3V SW WL_3 3V SW LDO 5 1 VA 3 5V LDO 5 1 VA D_1 5V...

Page 42: ...t no message on the front panel and stand by LED doesn t work 1 1 IC300 System 12 VA No 12 VA 1 1 1 Solution Replace MAIN board 1 1 2 How to troubleshoot Countermeasure 1 Please check 20 VA of IC300 pin2 VIN 2 If 20 VA is abnormal please check SMPS board pin4 5 6 3 If 20 VA is OK but 12 VA is abnormal pin3 of IC300 VOUT replace MAIN board 1 1 3 Service hint Any picture Remark MAIN board top view I...

Page 43: ...ou turn on your set it will blank no message on front panel and stand by LED doesn t work 1 2 IC303 System 3 3 V 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 pin3 2 If 3 3 VA is abnormal replace MAIN board 3 If 5 1 VA is OK replace FRONT board 1 2 3 Service hint Any picture Remark MAIN board top view IC303 IC303 L304 L304...

Page 44: ...n on your set it will blank no message on front panel and stand by LED doesn t work 1 3 LCD System power 12 V VCC_5V No 12 V VCC_5V 1 3 1 Solution Replace MAIN board 1 3 2 How to troubleshoot Countermeasure 1 Please check CN101 12 V pin7 VCC_5V pin3 2 If 12V VCC_5V is abnormal replace MAIN board 3 If 12V VCC_5V OK replace FRONT board 1 3 3 Service hint Any picture Remark MAIN board top view CN101 ...

Page 45: ...th module MAIN board 2 1 2 How to troubleshoot Countermeasure 1 Please check status of Bluetooth cable connection at CN102 and BT Module 2 Please check 3 3 VA at pin1 of CN102 If 3 3 VA is OK please check BT_RST USB_DP_BT USB_DN_BT BT_WAKEUP BT_STANDBY pin10 6 7 11 12 If no signal please replace MAIN board 2 1 3 Service hint Any picture Remark MAIN board top view CN102 CN102 ...

Page 46: ... NO SOUND 2 2 OPTICAL 2 2 1 Solution Replace JACK board 2 2 2 How to troubleshoot Countermeasure 1 Please check 3 3 VA at FB201 2 If 3 3 VA is ok please check OPT_IN signal R201 when optical mode 3 If signal is abnormal replace JACK board 2 2 3 Service hint Any picture Remark JACK board top view JK201 JK201 FB201 FB201 ...

Page 47: ...E NO SOUND 2 3 HDMI 2 3 1 Solution Replace JACK board 2 3 2 How to troubleshoot Countermeasure 1 Please check soldering status of HDMI jack and check HDMI_5 1VA at IC803 pin1 2 If soldering status and 5 1 VA are abnormal replace JACK board 2 3 3 Service hint Any picture Remark JACK board top view IC803 IC803 IC800 IC800 ...

Page 48: ...OINT REPAIR GUIDE NO SOUND 2 4 Portable 2 4 1 Solution Replace JACK board 2 4 2 How to troubleshoot Countermeasure 1 Please check soldering status of portable jack and check IC200 pin3 VCC_5V pin4 D_3 3V 2 If portable jack and voltage has abnormal status replace JACK board 2 4 3 Service hint Any picture Remark IC200 IC200 FB202 FB202 FB203 FB203 ...

Page 49: ...ure 1 Check DC voltage of speaker out FL FL TOP L TOP L SR L SR L CN700 pin6 5 4 3 2 1 Center Center CN701 pin2 1 and SR L SR L TOP R TOP R FR R FR R CN702 pin8 7 5 4 2 1 2 Check resistor crack cold solder of AMP IC out R718 R723 R724 R719 R7L9 R7L8 R7M1 R7M0 R722 R720 R7L5 R7H1 R7K9 R7H9 3 If AMP IC out is ok and speaker out has DC voltage replace MAIN board 3 1 3 Service hint Any picture Remark ...

Page 50: ...r No Sound 3 2 S SHUT DOWN PROTECTION 3 2 1 Solution Replace MAIN board 3 2 2 How to troubleshoot Countermeasure 1 Check PVDD voltage 20 VA of IC706 IC708 IC707 IC710 pin17 18 19 31 32 If PVDD voltage has 20 V under refer to STEP 1 1 2 Check impedance 4 Ω of speaker unit If impedance of speaker unit has 1 Ω under replace speaker unit 3 If check point 1 2 is ok replace MAIN board 3 2 3 Service hint...

Page 51: ...No Sound 3 3 B BURNT PROTECTION 3 3 1 Solution Replace MAIN board 3 3 2 How to troubleshoot Countermeasure 1 Check voltage 20 V of IC706 IC708 IC707 IC710 at pin17 18 19 31 32 If 12 V has problem refer to STEP 1 1 2 If 20 V is OK replace MAIN board 3 3 3 Service hint Any picture Remark MAIN board top view IC710 IC710 IC707 IC707 IC708 IC708 IC706 IC706 ...

Page 52: ...3 15 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 1 WAVEFORMS OF MAJOR CHECK POINT 1 CRYSTAL Fig 1 2 Crystal X801 27 MHz Fig 1 1 Crystal X501 27 MHz 1 2 2 ...

Page 53: ...16 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes CRYSTAL Fig 1 3 Crystal X603 12 288 MHz 3 3 6 7 4 5 2 FLASH VCC CS CLK DO Fig 2 Flash VCC CS CLK DO 5 7 4 6 ...

Page 54: ...rvice purposes 8 10 9 3 REMOTE CONTROL Fig 3 3 Remote Control High Timing Fig 3 1 Remote Control Input Voltage 8 Fig 3 2 Remote Control Low Timing 9 10 Item Measured Spec Input Level 3 3 V IR Receiver Spec 2 7 5 5 V Low Timing 4 4 ms 3 6 ms 5 04 ms High Timing 4 48 ms 4 08 ms 5 04 ms ...

Page 55: ...3 18 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 11 12 4 OPTICAL Fig 4 2 Optical Opt Det Fig 4 1 Optical Opt In 11 12 ...

Page 56: ... 3 13 V 3 47 V 3 341 V VDD_DMC 1 425 V 1 575 V 1 522 V VDD_USB 3 13 V 3 47 V 3 348 V IC602 Serial Flash 8 VCC 2 7 V 3 6 V 3 343 V IC705 DAC 13 21 25 47 VDD 1 14 V 1 26 V 1 216 V 20 48 DVCC 3 135 V 3 465 V 3 351 V 6 14 24 31 AVCC 3 135 V 3 465 V 3 332 V IC706 AMP 17 AVCC 4 5 V 26 V 23 01 V 18 19 31 32 PVCC 4 5 V 26 V 23 03 V IC707 AMP 17 AVCC 4 5 V 26 V 23 00 V 18 19 31 32 PVCC 4 5 V 26 V 22 98 V L...

Page 57: ...c All rights reserved Only for training and service purposes 3 22 3 21 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 ...

Page 58: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 24 3 23 2 MAIN P C BOARD DIAGRAM TOP VIEW ...

Page 59: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 26 3 25 MAIN P C BOARD DIAGRAM BOTTOM VIEW ...

Page 60: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 28 3 27 3 JACK P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 61: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 30 3 29 4 FRONT P C BOARD DIAGRAM 5 KEY P C BOARD DIAGRAM TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 62: ...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 63: ... 2 Copyright 2018 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 64: ...ht 2018 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 65: ...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 66: ...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 67: ...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 68: ...2018 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 69: ...Copyright 2018 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 70: ...4 9 Copyright 2018 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 71: ...4 10 Copyright 2018 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 72: ...4 11 Copyright 2018 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 73: ...4 12 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 74: ... 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 75: ... 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 76: ...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 77: ...Copyright 2018 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 78: ...ght 2018 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 79: ...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 80: ...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 81: ...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 82: ... 7 Copyright 2018 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 83: ...5 8 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 84: ...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 85: ...Copyright 2018 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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