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LG SK6Y, Руководство по обслуживанию

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 3-6

Copyright © 2018 LG Electronics Inc. All rights reserved.

Only for training and service purposes.

ONE POINT REPAIR GUIDE

NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR 
“HELLO” ON FRONT PANEL

When you turn on your set, it will blank / no message on front panel, and stand-by LED doesn’t work.

1-3. LCD System power VCC_5V, 3.3VA (No 5 V, 3.3 VA)

1-3-1. Solution

Replace MAIN board.

1-3-2. How to troubleshoot (Countermeasure)

1) Please check 3.3 VA, 5 V of CN107 pin10, pin6.

2) If 3.3 VA, 5 V is abnormal, replace MAIN board.

3) If 3.3 VA, 5 V is OK, replace FRONT board.

1-3-3. Service hint (Any picture / Remark)

< MAIN board top view >

3.3 VA

3.3 VA

5 V

5 V

CN107

CN107

Содержание SK6Y

Страница 1: ...ses SMARTHi FiAUDIO WirelessMulti roomSoundBar 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 p...

Страница 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 ...

Страница 3: ...SERVICING GUIDELINES 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 6 REAR SPEAKERS CONNECTION SOLD SEPARATELY 1 7 HIDDEN KEY MODE 1 8 SOFTWARE UPDATE GUIDE 1 9 SPECIFICATIONS 1 16 ...

Страница 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 ...

Страница 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...

Страница 6: ... sjy twp htssjhynts y ji yf nsl ts 5 yfsig rtij nymtzy sjy twp htssjhynts C Onxuqf nsit D 1 Standby F Qzshynts jqjhyx ymj kzshynts fsi nsuzy xtzwhj bT QT0 Z _ SOXT L N0 M_0 WR _a0 SOXT0 Z _ p o atqzrj bn Qn jqjhyx bn Qn kzshynts A DC IN LN fifuyjw nsuzy B OPTICAL IN connector Ntssjhy yt fs tuynhfq ij nhj C PORTABLE IN connector Ntssjhy utwyfgqj ij nhj D USB Service only b it sqtfi htssjhytw E LAN ...

Страница 7: ... 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 u...

Страница 8: ... 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...

Страница 9: ...EQ 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 ...

Страница 10: ...RRX_SK6_yymmrrrr BIN REARTx REARTX_SK6_yymmrrrr BIN 1 2 HOW TO UPDATE Copy Update f le 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 f nish system will restart automatically If reboot is f nish VFD display WiFi DO NOT turn off ...

Страница 11: ...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 ...

Страница 12: ... 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 f nish application show the result Step 5 Update f le downloading ...

Страница 13: ... 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 wireless subwoofer Power consumption Refer to the main label on the wireless 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 171 0 mm x 393 0 mm x 248 5 mm 6 7 inch x 15 5 inch x 9 8 ...

Страница 14: ...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 9 EXPLODED VIEWS 2 13 1 MAIN UNIT SECTION 2 13 2 WIRELESS SUBWOOFER SECTION 2 15 3 PACKING ACCESSORY SECTION 2 17 ...

Страница 15: ...ed Only for training and service purposes DISASSEMBLY INSTRUCTIONS 1 1 2 j Gi Gh Figure 1 1 1 HOW TO DISASSEMBLE THE MAIN UNIT Before begin position the Main Unit upside down 1 1 Case Bottom Assembly 1 Remove the 24 screws 2 Remove the Case Bottom Assembly ...

Страница 16: ...ining and service purposes 3 2 2 1 1 Figure 1 2 2 Figure 1 2 1 HOW TO DISASSEMBLE THE MAIN UNIT 2 Remove the 2 screws 3 Remove the Main Frame Assembly Main Chassis PCBA 1 2 Main Frame Assembly 1 Disconnect the 2 Network cables and harness cable from the Main PCB Assembly ...

Страница 17: ...GwjiGh t Gj Figure 1 2 1 Figure 1 2 2 HOW TO DISASSEMBLE THE MAIN UNIT 1 2 1 Front PCB Assembly 1 Remove the 2 screws 2 Remove the Front PCB Assembly 1 2 2 Main PCB Assembly 1 Detach the cables from the Main chassis 2 Disconnect the FFC cables from the Main PCB 3 Remove the 1 screw Main HDMI Jack 4 Remove the Main PCB Assembly ...

Страница 18: ...Module RECEIVER BT Module WIRELESS Module Figure 1 2 3 1 2 3 BT and WIRELESS Module 1 Disconnect the FFC cable from the BT module 2 Remove the BT module 3 Disconnect the FFC cable from the WIRELESS module 4 Disconnect the 2 Hooks 5 Remove the WIRELESS module 6 Disconnect the FFC cable from the WIRELESS module RECEIVER 7 Remove the WIRELESS module RECEIVER ...

Страница 19: ... All rights reserved Only for training and service purposes HOW TO DISASSEMBLE THE MAIN UNIT Figure 1 2 4 1 2 4 WI FI Module 1 Disconnect the FFC cable from the WI FI module 2 Disconnect the Hook 3 Remove the WI FI module 1 2 3 WITmpModule ...

Страница 20: ...purposes 1 1 2 1 1 2 3 2 1 1 Figure 1 3 Figure 1 4 HOW TO DISASSEMBLE THE MAIN UNIT 1 3 SPEAKER CHAMBER L R Assembly 1 Press the hook on both sides 2 Disconnect the Network cable 1 4 KEY PCB Assembly 1 Remove the Button Assembly 2 Remove the Key PCB Assembly 3 Disconnect the harness cable ...

Страница 21: ...or training and service purposes Figure 1 5 Speaker network cable from SPK Chamber L R Assembly to MAIN PCB HOW TO DISASSEMBLE THE MAIN UNIT 1 5 How to organize cables When assembling place the cables Speaker network cables and Key cable as shown in the f gure below ...

Страница 22: ... reserved Only for training and service purposes SPK cable Rear Panel Assembly Figure 2 1 1 Figure 2 1 2 2 HOW TO DISASSEMBLE THE SUBWOOFER 2 1 Rear Panel Assembly 1 Remove the 8 screws 2 Pull out the Rear Panel Assembly and disconnect the SPK cable ...

Страница 23: ...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...

Страница 24: ...for training and service purposes 1 2 AMP SMPS PCB Assembly AMP SMPS PCB Assembly 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 ...

Страница 25: ...2 12 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 26: ... A54 CABLE3 A42 WIRELESS A54 265 C A41 H A55 264 253 266 FRONT 268 I C J D I 267 LCD401 262 263 CABLE7 F J A51 A80L A80R B A A43 2 14 2 13 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 CABLE4 ...

Страница 27: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 2 WIRELESS SUBWOOFER SECTION B B A A 954 953 A900 A45W A54W 952 961 951 2 15 2 16 ...

Страница 28: ...lectronics Inc All rights reserved Only for training and service purposes 300 Power cord 833 AC adapter 900 Remote control 836 Screws 2 835 Wall bracket 806 Optical cable Optional Part 829 Cable tie 3 PACKING ACCESSORY SECTION ...

Страница 29: ...2 18 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 30: ...1 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 FLASH MEMORY 3 14 3 TACT KEY 3 15 4 REMOTE CONTROL 3 17 5 OPTICAL 3 18 CIRCUIT VOLTAGE CHART 3 19 PRINTED CIRCUIT BOARD DIAGRAMS 3 23 1 MAIN P C BOARD DIAGRAM 3 23 2 FRONT P C BOARD DIAGRAM 3 25 3 KEY P C BOARD DIAGRAM 3 25 ...

Страница 31: ...ck SMD 6630R3S006L MICOM Download 㟝 4 P 1 mm ST Non Lock SMD 6630R FB02D B to B KEY FRONT HDMI PTB OPT ADAPTER HDMI 4 P 2 0 mm ST Lock SMD 5 P 2 0 mm ST Lock SMD USB MAIN Wi Fi LCD Module 2 P 1 25 mm ST Non_Lock SMD 6 P 1 25 mm ST Non_Lock SMD 10 P 1 mm AG Lock SMD 12 P 2 mm ST SOCKET SMD Ethernet U 12 P 0 5 mm AG Lock SMD 12 P 2 mm AG HEADER SMD BT B 26 P 0 5 mm AG Lock SMD Wireless WIRING DIAGRA...

Страница 32: ...I2C 24 576M FR_P N TWR_P N AUDIO ANALOG AUDIO PWM AUDIO SPDIF DC_DC LDO Switch IC FL_P N TWL_P N DDR3 128 MB x 2 A RA 0 14 SPI0 27 M NAND 512 MB M_MCLK LRCK BCK ADC_DAT WL_MUTE INIT RST MSG_RDY CLK DAT PWM_BCK LRCK DATA2 Wireless Woofer Wireless Module RX FRONT LCD 5 digit LCD_DO CLK STB BL_CTRL RMC RMC KEY S Flash 1 MB POWER FUNC VOL SPI BT_TX RX MT8506 1 2 1 5 3 3V DD DTS Decoding FL TWL LPF 40W...

Страница 33: ...rement condition 20W 1k 0dB condition 160W Instantaneous Peak condition 160W 400mA_RMS 3200mA_RMS Measurement condition 6400mA_8 3ms_Dynamic condition AWG 24 4 A Alive VCC Ctrl VCC SDRAM NAND MPEG ADC PWM 301 mA D_3 3 V 36 mA DDR MT8506 898 mA 538 mA HDMI OUT IC306 VCC_5V HDMI_5VA Wi Fi 520 mA DCDC SWITCH 23 mA LCD RMC LED R 1 61 A 0 6 A 0 85 A IC307 12 VA 1 2 V IC303 5 1 VA 1 5 V 12 V LED B G 20 ...

Страница 34: ...our set no message on the front panel and stand by LED doesn t work 1 1 IC302 System 12 VA No 12 VA 1 1 1 Solution Replace MAIN board 1 1 2 How to troubleshoot Countermeasure 1 Please check 25 VA of IC302 pin2 VIN 2 If 25 VA is abnormal please check adapter 3 If 25 VA is OK but 12 VA is abnormal pin3 of IC302 VOUT replace MAIN board 1 1 3 Service hint Any picture Remark MAIN board top view IC302 I...

Страница 35: ...ou turn on your set it will blank no message on front panel and stand by LED doesn t work 1 2 IC301 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 IC301 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 IC301 IC301 L301 L301...

Страница 36: ...it will blank no message on front panel and stand by LED doesn t work 1 3 LCD System power VCC_5V 3 3VA No 5 V 3 3 VA 1 3 1 Solution Replace MAIN board 1 3 2 How to troubleshoot Countermeasure 1 Please check 3 3 VA 5 V of CN107 pin10 pin6 2 If 3 3 VA 5 V is abnormal replace MAIN board 3 If 3 3 VA 5 V is OK replace FRONT board 1 3 3 Service hint Any picture Remark MAIN board top view 3 3 VA 3 3 VA ...

Страница 37: ...ND 2 1 BLUETOOTH 2 1 1 Solution Replace MAIN board 2 1 2 How to troubleshoot Countermeasure 1 Please check status of Bluetooth cable connection at CN104 and BT module 2 Please check 3 3 VA at pin1 of CN104 If 3 3V is OK please check BT_RST DP_BT DN_BT pin10 6 7 If no signal please replace MAIN board 2 1 3 Service hint Any picture Remark CN104 CN104 ...

Страница 38: ...2 2 OPTICAL 2 2 1 Solution Replace MAIN board 2 2 2 How to troubleshoot Countermeasure 1 Please check 3 3 VA at FB203 2 If 3 3 VA is ok please check OPT_IN signal R207 when optical mode 3 If signal is abnormal replace MAIN board 2 2 3 Service hint Any picture Remark MAIN board top view R207 R207 MAIN board bottom view FB203 FB203 ...

Страница 39: ...view ONE POINT 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_5V at IC306 pin1 2 If soldering status and HDMI_5V are abnormal replace MAIN board 2 3 3 Service hint Any picture Remark IC306 IC306 ...

Страница 40: ...UND 2 4 PORTABLE 2 4 1 Solution Replace MAIN board 2 4 2 How to troubleshoot Countermeasure 1 Please check the 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 MAIN board 2 4 3 Service hint Any picture Remark MAIN board bottom view IC200 IC200 ...

Страница 41: ...tion Replace MAIN board 3 1 2 How to troubleshoot Countermeasure 1 Check DC Voltage of speaker out FL TWL CN703 pin1 2 3 4 FR TWR CN704 pin1 2 4 5 2 Check resistor crack cold solder of PWM IC out AR601 AR602 3 If PWM IC out is ok and speaker out FL FR TWL TWR has DC voltage replace MAIN bottom board 3 1 3 Service hint Any picture Remark MAIN board top view IC600 IC600 CN704 CN704 CN703 CN703 ...

Страница 42: ...asure 1 Check PVDD voltage 25 V of IC700 IC701 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 pin1 2 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 MAIN board 3 2 3 Service hint Any pic...

Страница 43: ...01 IC700 IC700 ONE POINT REPAIR GUIDE PROTECTION ERROR No display or No Sound 3 3 B BURNT PROTECTION 3 3 1 Solution Replace MAIN board 3 3 2 How to troubleshoot Countermeasure 1 Check voltage 12 V of IC700 IC701 at pin1 2 if 12 V has problem refer to STEP 1 1 2 If 12 V is OK replace MAIN board 3 3 3 Service hint Any picture Remark ...

Страница 44: ...tronics Inc All rights reserved Only for training and service purposes WAVEFORMS OF MAJOR CHECK POINT 1 CRYSTAL FIG 1 1 X501 27 MHz 1 FIG 1 2 X600 24 576 MHz 2 2 FLASH MEMORY 5 6 4 3 FIG 2 VCC CS CLK DO 3 4 5 6 VCC CS CLK DO 1 2 ...

Страница 45: ...r training and service purposes 3 TACT KEY FIG 3 2 Press Power Key About 1 67 V FIG 3 1 Press No Key About 3 34 V 7 7 FIG 3 3 Press FUNC Key FIG 3 4 Press VOL Key About 1 35 V About 1 09 V 7 7 FIG 3 5 Press VOL Key FIG 3 6 Press Wi Fi Key About 0 77 V About 0 45 V 7 7 ...

Страница 46: ...3 16 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes TACT KEY 7 ...

Страница 47: ...nly for training and service purposes 4 REMOTE CONTROL FIG 4 1 Input Voltage 8 FIG 4 2 Low Timing 9 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 FIG 4 3 High Timing 10 9 10 8 ...

Страница 48: ...3 18 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 12 11 5 OPTICAL FIG 5 1 OPT_IN 11 FIG 5 2 OPT_DET 12 ...

Страница 49: ...d Voltage SW 3 Vin 5 12 V VOUT 3 36 V IC302 DC DC MP9442 Spec TYPE TSOT23 8 Vin 4 0 V 36 V VENDER MPS Vout 0 8 V 33 V Vin 2 Measured Voltage Vout 3 Vcc 25 44 V Vout 12 05 V IC Symbol IC Name Type Vcc Vdd IC303 DC DC TLV62565 Spec TYPE SOT 23 Vin 2 7 V 5 5 V VENDER TI VOUT 0 6 V 5 225 V Vin 4 Measured Voltage SW 3 Vin 5 10 V VOUT 1 52 V IC304 Switch IC SY6288C3AAC Spec TYPE TSOT23 5 Vin 2 5 V 5 5 V...

Страница 50: ...NDER SPANSION Measured Voltage VCC 12 37 VCC 3 32 V IC606 IC Sound Audio Processor PS9860 Spec TYPE QFN8X8 VDD_IO 2 97 V 3 63 V VENDER PULSUS VDD_CORE 1 08 V 1 32 V VDD_IO 17 52 VIN33_REG1 2 97 V 3 63 V VDD_CORE 6 25 VIN33_REG2 2 97 V 3 63 V VIN33_REG1 34 VDD_PLL 1 08 V 1 32 V VIN33_REG2 66 Measured Voltage VDD_PLL 68 VDD_IO 3 34 V VDD_CORE 1 22 V VIN33_REG1 3 34 V VIN33_REG2 3 34 V VDD_PLL 1 22 V...

Страница 51: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 24 3 23 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Страница 52: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 26 3 25 2 FRONT P C BOARD DIAGRAM 3 KEY P C BOARD DIAGRAM TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Страница 53: ...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 ...

Страница 54: ... 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 ...

Страница 55: ...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 ...

Страница 56: ...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...

Страница 57: ...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 ...

Страница 58: ...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...

Страница 59: ...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 ...

Страница 60: ...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 ...

Страница 61: ...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 ...

Страница 62: ...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 ...

Страница 63: ...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 ...

Страница 64: ...4 12 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 65: ... VDD_PLL 1 08 V 1 32 V 1 28 V 1 28 V WIC701 IC Audio Amplif er 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...

Страница 66: ... 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 ...

Страница 67: ...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 ...

Страница 68: ...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 ...

Страница 69: ...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 ...

Страница 70: ...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...

Страница 71: ...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 ...

Страница 72: ...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...

Страница 73: ... 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 ...

Страница 74: ...5 8 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Страница 75: ...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 ...

Страница 76: ...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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