LG LAS950M Service Manual
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LG LAS950M Service Manual

Smart hi-fi audio wireless multi-room sound bar
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Internal Use Only
SMART Hi-Fi AUDIO
Wireless Multi-room Sound Bar
SERVICE MANUAL
MODEL: LAS950M
(LAS950M, S95A1-D)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN77195062
JANUARY, 2016

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Summary of Contents for LG LAS950M

  • Page 1 Internal Use Only SMART Hi-Fi AUDIO Wireless Multi-room Sound Bar SERVICE MANUAL MODEL: LAS950M (LAS950M, S95A1-D) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN77195062 JANUARY, 2016...
  • Page 2 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..ELECTRICAL SECTION 3 ..CABINET & MAIN CHASSIS SECTION 4 ..WIRELESS SUBWOOFER PART SECTION 5 ..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 1 SUMMARY CONTENTS 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 LAN UPDATE GUIDE ............................1-6 SOFTWARE UPDATE GUIDE ........................

  • Page 4: Product Safety Servicing Guidelines For Audio Products

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

  • Page 5: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing the Audio products covered by this Electrostatically Sensitive (ES) Devices service data and its supplements and addends, read and fol- Some semiconductor (solid state) devices can be damaged low the SAFETY PRECAUTIONS. easily by static electricity. Such components commonly are NOTE: if unforeseen circumstances create conflict between called Electrostatically Sensitive (ES) Devices.

  • Page 6: Wireless Subwoofer Connection

    WIRELESS SUBWOOFER CONNECTION LED indicator of wireless subwoofer LED Color Status Green The connection is trying. (Blink) Green The connection is completed. The wireless subwoofer is in standby mode or the connection is failed. The power cord of wireless (No display) subwoofer is disconnected.

  • Page 7: Lan Update Guide

    LAN UPDATE GUIDE 1. Using MP tool 1) Open MP tool and select “Key DN”. 2) Check the section for download and open download fi le.
  • Page 8 3) Connect PC and SET by cross LAN cable. PC IP setting 192.168.0.1 Subnet: 255.255.254.0 Gateway: 10.168.0.1 4) Set power on. 5) Connect LAN cable to Set and then Press “ADD” key within 3 seconds after connect the LAN. (Please connect the LAN when blinking WiFi-LED after booting) *Download fi...
  • Page 9 7) Press “Update” button. 8) Download result display “OK!” if start download.
  • Page 10 9) You can identify update status by network indicator lamp. <Updating : blinking red LED> <Complete update : blinking white LED>...

  • Page 11: Software Update Guide

    SOFTWARE UPDATE GUIDE 1. Using USB 1-1. MICOM 1) Copy the fi rmware to USB. - Change the fi le name to “MICOM_LAS950.HEX”. 2) Insert USB to USB port. 3) VFD display “UPGRADE”. 4) Press “PLAY/PAUSE” key. 5) VFD display “M-UPDATE”. 6) Set auto power off after updating done.
  • Page 12 2. Using APP 1) Connect set and music fl ow app. 2) Select “setup  update” menu then you can see below menu. 3) Enter “Check” button then display speaker list for update. download 1-11...
  • Page 13 4) Enter “download” button then start download to speaker. d o wn load Downloading… 5) Display below menu after done download then enter “Ready” button for updating. Read y Downloaded 1-12...
  • Page 14 6) Display below menu after done update Updated 7) Set rebooting. (Booting previous version if failed update.) 1-13...

  • Page 15: How To Wireless Factory Reset & Pairing

    HOW TO WIRELESS FACTORY RESET & PAIRING 1) Main set Wireless Reset. - Volume Minimum state + Remote control “mute” for 5 seconds. - Then, “WL RESET” will be displayed on the LCD. 2) Power off Main set. 3) Wireless Subwoofer: Wireless Reset. - Press and hold PAIRING key on the back of the wireless subwoofer for more than 5 seconds.

  • Page 16: Version Check

    VERSION CHECK 1) PC IP setting 192.168.0.1 Subnet: 255.255.254.0 Gateway: 10.168.0.1 2) Open MP tool. 3) Set power on. 4) Press “ADD” button after connect LAN cable. 5) Display the version in the tool. 1-15...

  • Page 17: Option Edit Guide

    OPTION EDIT GUIDE 1-1. Option Edit-1 1) PC IP setting 192.168.0.1 Subnet: 255.255.254.0 Gateway: 10.168.0.1 2) Open MP tool. 3) Check Option Transmission and select option fi le by “File open” button. 4) Set power on. 5) Press “ADD” button after connect LAN cable. 6) Enter “Update”...

  • Page 18: Specifications

    SPECIFICATIONS • GENERAL Power requirements 120 V ~ 60 Hz Power consumption 50 W Networked standby : 6.0 W (If all network ports are activated.) Dimensions (W x H x D) (1100 x 106 x 135) mm ((43.3 x 4.2 x 5.3) inch) (without Foot) Net Weight (Approx.) 8.2 kg (18.1 lb) Operating temperature...
  • Page 19 1-18...
  • Page 20 SECTION 2 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................2-2 1. NO POWER PROBLEM......................... 2-2 2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR “HELLO” ON FRONT PANEL ......................... 2-4 3. NO SOUND ............................. 2-7 ELECTRICAL TROUBLESHOOTING GUIDE ....................2-12 1.

  • Page 21: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER PROBLEM If the unit doesn’t work by no power problem, repair the set according to the following guide. 1-1. No power 1-1-1. Solution Replace F901, BD901, TH901 on SMPS board. 1-1-2. How to troubleshoot (Countermeasure) 1) Check if the fuse F901 is open or short-circuit.
  • Page 22 ONE POINT REPAIR GUIDE NO POWER PROBLEM If the unit doesn’t work by no ±PVDD problem, repair the set according to the following guide. 1-2. No AMP power 1-2-1. Solution Replace F901, Q901 on SMPS board. 1-2-2. How to troubleshoot (Countermeasure) 1) Check if the fuse F901 is open or short-circuit.
  • Page 23 ONE POINT REPAIR GUIDE 2. 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. 2-1.

  • Page 24: Booting When You Turn The Unit On, No Message Or "Hello" On Front Panel

    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. 2-2. IC308 System 3.3 VA (No 3.3 VA) 2-2-1.
  • Page 25 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. 2-3. LCD System power 5 V, 6.2 VA (No VCC_5V, No 6.2VA) 2-3-1.
  • Page 26 ONE POINT REPAIR GUIDE 3. NO SOUND 3-1. WIRELESS 3-1-1. Solution Replace IC102 on MAIN board. 3-1-2. How to troubleshoot (Countermeasure) 1) Please check externally status of Wireless module cable connection on your eyes. (at CN100 and Wireless module) 2) Please check 3.3 V of WLS_3.3V (at L101). If 3.3 V is OK, please check SPI signal (WL_SPI_CS/DO/WP/DI/CLK) of IC102 (pin1, 2, 3, 5, 6).

  • Page 27: Sound

    ONE POINT REPAIR GUIDE NO SOUND 3-2. BLUETOOTH 3-2-1. Solution Replace IC501 on MAIN board. 3-2-2. How to troubleshoot (Countermeasure) 1) Please check externally status of Bluetooth module cable connection on your eyes. (at CN2011 and Bluetooth module) 2) Please check 3.3 VA (at L205). If 3.3 VA is OK, please check BT_RST, M_I2S_BCK, BT_PCM_IN of CN2011 (pin12, 11, 10) and BT_UART_RX, BT_UART_TX (pin4, 6).
  • Page 28 ONE POINT REPAIR GUIDE NO SOUND 3-3. OPTICAL 3-3-1. Solution Replace IC501 on MAIN board. 3-3-2. How to troubleshoot (Countermeasure) 1) Please check 3.3 VA (at L203). 2) If you can check 3.3 VA, please check OPT_DET signal (R204, R205) when optical mode. 3) In spite of process 2), set has abnormal output, then replace IC501.
  • Page 29 ONE POINT REPAIR GUIDE NO SOUND When unit is connected to HDMI TV using HDMI cable, picture shows bad color, no output or mixed color on the screen. But component output is OK. 3-4. HDMI 3-4-1. Solution Replace IC800, CN800, CN801, CN802, CN803 (HDMI jack). 3-4-2.
  • Page 30 ONE POINT REPAIR GUIDE NO SOUND 3-5. IC705 (DAC IC) 3-5-1. Solution Replace IC7001, IC7003, IC7005, IC7007 (DAC IC). 3-5-2. How to troubleshoot (Countermeasure) 1) Check IC7001, IC7003, IC7005, IC7007 pin soldering. 2) If there is short soldering on pin, re-soldering. 3) Check DAC_3.3V at L7000, L7002, L7004, L7006, L7010, L7012, L7015, L7017.

  • Page 31: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER SUPPLY ON SMPS BOARD Power on mode no output 25 VA. Power off mode no output 12 VA. Replace F901. Is F901 normal? (same fuse) Replace IC901. Is IC901 normal? Replace D903. Is the VCC Check or replace (10 ~ 28 V) supplied to IC901 D904.

  • Page 32: Power Supply On Main Board

    ELECTRICAL TROUBLESHOOTING GUIDE 2. POWER SUPPLY ON MAIN BOARD NO 3.7 VA Is 25 VA to pin7 Check 25 VA on SMPS board. of IC305 normal? Replace D301. Is D301 normal? Is switching pulse of Replace IC305. IC305 pin1 normal? 3.7 VA power line is normal.
  • Page 33 ELECTRICAL TROUBLESHOOTING GUIDE NO D_3.3V (DSP / MPEG) Is 3.7 VA to pin3 Check IC309 & 3.7 VA power line. of IC309 normal? Is there DC voltage Check R347. to pin2 of IC309? Is there DC voltage Check R348, R349, R352. to pin6 of IC309? D_3.3V power line is normal.
  • Page 34 ELECTRICAL TROUBLESHOOTING GUIDE NO WLS_3.3V (Wireless module) Is 3.7 VA to pin1 Check IC305 & 3.7 VA power line. of IC303 normal? Is there H (3.3 V) voltage Check R318. to pin3 of IC303? Is there DC voltage Replace IC303. to pin5 of IC303? WLS_3.3V power line is normal.
  • Page 35 ELECTRICAL TROUBLESHOOTING GUIDE NO 6.2 VA Is 25 VA to pin7 Check 25 VA on SMPS board. of IC304 normal? Replace D300. Is D300 normal? Is switching pulse of Replace IC304. IC304 pin1 normal? 6.2 VA power line is normal. NO VCC_5V (USB &...
  • Page 36 ELECTRICAL TROUBLESHOOTING GUIDE NO 1.5 V (MPEG & DDR3) Is 6.2 VA to pin8, 13 Check IC304 & 6.2 V power line. of IC300 normal? Is there H (3.3 V) voltage Check R306, R307. to pin6, 15 of IC300? Is switching pulse of Replace IC300.
  • Page 37 ELECTRICAL TROUBLESHOOTING GUIDE NO HDMI_3.3V Is 3.7 VA to pin2 of Check IC305 & 3.7 VA power line. IC801 normal? Is there H (3.3 V) voltage Check R848. to pin1 of IC801? Is there DC voltage Replace R847, R849, R850 & IC801. to pin3 of IC801? HDMI_3.3V power line is normal.

  • Page 38: System Part

    ELECTRICAL TROUBLESHOOTING GUIDE 3. SYSTEM PART POWER ON Pin1 of IC305 Check IC305, IC308 STAND-BY LED OK ? and pin6 of IC308 and SMPS board. are OK? Check MICOM MAIN Board S/W download. Check IC305, IC308. 3.3 VA OK? FRONT Board Check Q402, LD400.
  • Page 39 ELECTRICAL TROUBLESHOOTING GUIDE “HELLO” Signal Replace IC101. Display on LCD EEPROM_CLK / DAT (EEPROM) Signal MICOM_UART_TX Replace IC100 or IC501. MICOM_UART_RX 6.2 VA, Replace LCD. VCC_5V, F_3.3VA MAIN Board Signal Check connection LCD_DO / CLK / STB & LCD module. Signal Check Q403.

  • Page 40: Audio Output

    ELECTRICAL TROUBLESHOOTING GUIDE 4. NO AUDIO OUTPUT SPEAKER OUTPUT Check CN7000, CN7001 CN7002 or replace. SOUND OK? Pin39, 40, 41, 44, 49, 52 Check IC600 (DSP) or replace. of IC600 signal OK? Pin6, 7 Check each DAC IC or replace. of IC7001, IC7003, IC7005, IC7007 signal OK? Pin21, 23, 27, 29...
  • Page 41 ELECTRICAL TROUBLESHOOTING GUIDE OPTICAL FUNCTION JK201, JK204 Replace JK201, JK204. status OK ? JK201, JK204 pin3 Check L203 & 3.3 VA line. 3.3 VA OK? OPT1/2_DET Check OPT_SPDIF & OPT_DET signal line. OPT1/2_SPDIF signal Replace IC501. Wi-Fi FUNCTION CN200 Replace CN200. status OK? CN200 pin6 Check WIFI_3.5VA line.

  • Page 42: Hdmi Output

    ELECTRICAL TROUBLESHOOTING GUIDE 5. NO HDMI OUTPUT No HDMI Audio / Video output CN105, CN804 Replace B to B (board to board) connector. B to B connector OK? CN803 pin18 & Check D812 & HDMI_5.5VA line. HDMI_5.5VA OK? CN803 pin19 HP_DET Check hot plug detect signal from TV.

  • Page 43: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. ADC I2S WAVEFORM (IC200) M_I2S_MCLK Waveform (24.576 MHz) - PIN6 M_I2S_BCK Waveform (3.072 MHz) - PIN8 M_I2S_LRCK Waveform (48.00 MHz) - PIN7 M_ADC_DATA Waveform - PIN9 2-24...

  • Page 44: Dsp Output I2S Waveform (Ic600)

    2. DSP OUTPUT I2S WAVEFORM (IC600) DSP_I2S_BCK Waveform (12.288 MHz) - PIN40 DSP_I2S_LRCK Waveform (192 KHz) - PIN39 DSP_I2S_FL_RL/C_FW/FR_RR/BL_BR Waveform DSP_I2S_FL_RL/C_FW/FR_RR/BL_BR Waveform & Rising time - PIN44, 49, 52 & Rising time - PIN44, 49, 52 2-25...

  • Page 45: Lcd Data Line Output Waveform (Ic100)

    3. LCD DATA LINE OUTPUT WAVEFORM (IC100) LCD_DO Waveform - PIN44 LCD_STB Waveform - PIN45 LCD_CLK Waveform - PIN46 2-26...

  • Page 46: Rmc Waveform

    4. RMC WAVEFORM RMC LEAD CODE TIMING (SPEC 4.5 ms) RMC LEAD CODE TIMING (SPEC 4.5 ms) RMC BIT CODE TIMING (SPEC 0.56 ms) 2-27...

  • Page 47: I2C Waveform

    5. I2C WAVEFORM UART_TX (MICOM  MPEG) UART_RX (MICOM  MPEG) SPI_CLK (MICOM  DSP) SPI_DAT (MICOM  DSP) 2-28...
  • Page 48 I2C WAVEFORM HDMI_SCL (MICOM  HDMI) HDMI_SDA (MICOM  HDMI) DSP_OUTPUT_BCK (DSP  DAC x 4 / Wireless) DSP_OUTPUT_LRCK (DSP  DAC x 4 / Wireless) 2-29...
  • Page 49 2-30...

  • Page 50: Wiring Diagram

    WIRING DIAGRAM HDMI 20P, 2mm ST, SOCKET, SMD (EAG63717506) 8P, 2.0mm ST, SMD 8P, 2.50mm 20P, 2mm Board IN MAIN Type DIP HEADER, SMD (EAG63717505) SMPS 6P, 1.25mm 12P, 0.5mm 26P, 0.5mm 2P, 1.25mm 16P, 1mm 2P, 2mm 6P, 2mm 8P, 2mm ST, Lock, SMD ST, Lock, SMD...

  • Page 51: Block Diagrams

    BLOCK DIAGRAMS 1. POWER BLOCK DIAGRAM BD901 TH901 (C905,C906) SNUBBER BLOCK (D902,C964,C930 T901 R915,R957,BC901) RECTIFIER & TRANS NOISE FILTER SMOOTING BLOCK 25 VA (ON) BLOCK (D917,C951, 12 VA (STAND-BY) (CM901,R901, C952,C953) CM903,VR901, LF901,LF902) DRIVE & S/W BLOCK (IC101, D104, R105, R102, C108 , C109, ZD101,ZD102,C113) FUSE...

  • Page 52: System Block Diagram

    MT8506 PCM5101 TPA3116D2 WiFi_P/N Wi -Fi OPT1_SPDIF (NEW) OPTICAL IN1 OPT2_SPDIF 1.2 / 1.5 / 3.3 V OPTICAL IN2 LAS950M 525W (75 W * 7EA) DD/DTS Decoding BT_RST/I2S/UART Flash (ROM) 1 MB EPHY_TDP/N, EPHY_RDP/N WOOFER SPI_DI/DO/CS/CLK/WP ETHERNET A_RA[0-14] A A RA[0 14]...

  • Page 53: Circuit Diagrams

    DESIGN BE MODIFIED OR ALTERED WITHOUT DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. COMPONENTS SHOULD BE REPLACED ONLY WITH...

  • Page 54: Main - Micom Circuit Diagram

    2. MAIN - MICOM CIRCUIT DIAGRAM MICOM EAX66206501 Rev1.3(11) MAIN(#1) 2014.12.10 2-39 2-40...

  • Page 55: Main - Mpeg Circuit Diagram

    3. MAIN - MPEG CIRCUIT DIAGRAM MPEG EAX66206501 Rev1.3(11) MAIN(#2) 2014.12.10 2-41 2-42...

  • Page 56: Main - Memory Circuit Diagram

    4. MAIN - MEMORY CIRCUIT DIAGRAM MEMORY EAX66206501 Rev1.3(11) MAIN(#3) 2014.12.10 2-43 2-44...

  • Page 57: Main - Adc & I/O Circuit Diagram

    5. MAIN - ADC & I/O CIRCUIT DIAGRAM ADC & I/O EAX66206501 Rev1.3(11) MAIN(#4) 2014.12.10 2-45 2-46...

  • Page 58: Main - Dcdc Circuit Diagram

    6. MAIN - DCDC CIRCUIT DIAGRAM DCDC EAX66206501 Rev1.3(11) MAIN(#5) 2014.12.10 2-47 2-48...

  • Page 59: Main - Dsp Circuit Diagram

    7. MAIN - DSP CIRCUIT DIAGRAM EAX66206501 Rev1.3(11) MAIN(#6) 2014.12.10 2-49 2-50...

  • Page 60: Main - Dac / Amp Circuit Diagram

    8. MAIN - DAC / AMP CIRCUIT DIAGRAM DAC/AMP EAX66206501 Rev1.3(11) MAIN(#7) 2014.12.10 2-51 2-52...

  • Page 61: Hdmi Circuit Diagram

    9. HDMI CIRCUIT DIAGRAM HDMI EAX66166301 Rev1.3(11) 2014.12.10 2-53 2-54...

  • Page 62: Front Circuit Diagram

    10. FRONT CIRCUIT DIAGRAM FRONT EAX66225701 Rev1.3(11) 2014.12.10 2-55 2-56...

  • Page 63: Key Circuit Diagram

    11. KEY CIRCUIT DIAGRAM EAX66166401 Rev1.3(11) 2014.12.10 2-57 2-58...

  • Page 64: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs Mearsured Mearsured Designator Desc. Voltage Spec Designator Desc. Voltage Spec Voltage Voltage Main Board HDMI Board IC100 MICOM VDD : 1.6 ~ 5.5V 15,16 3.28 AVDD33 : 3.14V ~ 3.46V 14,33 3.33 IC101 EEPROM VCC : 1.8V ~ 5.5V 3.28 IOVCC33 : 3.14V ~ 3.46V 63,88...

  • Page 65: Capacitors

    2. CAPACITORS 3. CONNECTORS 100V-10% 240V/50Hz+10% Mearsured Voltage Part Designator Voltage Spec Remarks Location Value Capacitor (uF) Voltage Spec #79 / #1 Measured voltage Measured voltage CN100 WLS_3V3 3.62 Wireless SMPS Board VCC_5V 5.08 C905 68uF 460V 154.5V 310V CN104 6.2VA 6.17 FRONT...

  • Page 66: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P. C. BOARD DIAGRAM (TOP VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. (BOTTOM VIEW) 2-63 2-64...

  • Page 67: Main P. C. Board Diagram

    2. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 2-65 2-66...

  • Page 68: Hdmi P. C. Board Diagram

    3. HDMI P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 4. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 5. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 2-67 2-68...
  • Page 69 2-69 2-70...
  • Page 70 SECTION 3 CABINET & MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS ........................3-3 EXPLODED VIEWS ............................3-9 1. MAIN SET SECTION ..........................3-9 2. WIRELESS SUBWOOFER SECTION ....................3-11 3. PACKING ACCESSORY SECTION ....................... 3-13...

  • Page 71: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS Before you begin, position the main set upside down. 1. Cover Bottom Assembly 1) Remove the 20 screws on the main set. 2) Remove the Cover Bottom Assembly. Cover Bottom Assembly Fig. 1 2. Cover Back 1) Remove the 11 screws securing the Cover Back. 2) Detach the power cord from the Cover Back.
  • Page 72 3. Chassis Main Assembly 1) Remove the 10 (②) screws securing the Chassis Main Assembly. 2) Disconnect the Harness/FFC cables from the Main Board. 3) Remove the Chassis Main Assembly. Chassis Main Assembly Fig. 3 4. Key Board 1) Remove the 2 screws securing the Button Assembly. 2) Remove the Button Assembly (Bracket Button + Button).
  • Page 73 5. SMPS Board 1) Disconnect the Harness cable from the Main Board. 2) Remove the 4 (①) screws securing the SMPS Board. 3) Remove the SMPS Board. 6. Bluetooth Module 1) Disconnect the FFC cable from the Main Board. 2) Remove the Bracket BT. 3) Remove the Bluetooth Module.
  • Page 74 7. Cover Top Assembly 1) Remove the 10 screws securing the Cover Top Assembly. 2) Remove the Cover Top Assembly. [Reassembly CAUTION] Cover Top Assembly Fig. 7...
  • Page 75 8. Wi-Fi Module 1) Remove the 2 screws securing the Bracket Wi-Fi. 2) Disconnect the Harness cable from the Wi-Fi Module. 3) Remove the Wi-Fi Module. 9. Wireless Module 1) Remove the 2 screws securing the Wireless Module. 2) Disconnect the FFC cable from the Wireless Module. 3) Remove the Wireless Module.
  • Page 76 11. Case Back Center 1) Remove the 8 screws securing the Case Back Center. 2) Detach the EMI Gasket. 3) Remove the Case Back Center. Fig. 9 12. Front Board 1) Remove the 4 screws securing the Front Board. 2) Remove the Front Board. Fig.

  • Page 78: Exploded Views

    EXPLODED VIEWS 1. MAIN SET 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. SPK7001 274L SPK7000 SPK7002 274C CABLE5 281L CABLE2 274R SMPS CABLE3 HDMI...

  • Page 79: Wireless Subwoofer Section

    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 A331 LITERATURE. A330 A332 SMPS A81M WIRELESS A81S A81A A81L A81K...

  • Page 80: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 823 HDMI cable 801 Owner’s manual 808 Batteries (2) 831 LAN cable 806 Optical cable 829 Cable tie 835 Wall bracket 836 Screws (2) 837 Cover foot (2) 839 IR Blaster 900 Remote control 803 Main packing 804 Bag 802 Box...
  • Page 81 3-15 3-16...
  • Page 82 SECTION 4 WIRELESS SUBWOOFER PART CONTENTS ONE POINT REPAIR GUIDE ..........................4-2 1. NO POWER PROBLEM ......................... 4-2 2. POWER ON ERROR (12 V, 5 VA) ......................4-4 3. POWER ON ERROR (3.3 VA, 3 V) ......................4-5 4. WIRELESS CONNECTION ........................4-6 CIRCUIT DIAGRAMS ............................

  • Page 83: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER PROBLEM No power problem occurs when you power on the unit. 1-1. Fuse & Bridge diode 1-1-1. Solution Replace F901, BD901 on SMPS board. 1-1-2. How to troubleshoot (Countermeasure) 1) Look at the physical of fuse F901. 2) Check the bridge diode BD901.
  • Page 84 ONE POINT REPAIR GUIDE NO POWER PROBLEM No power problem occurs when you power on the unit. 1-2. PVDD (36 V) abnormal 1-2-1. Solution Replace D951, IC901. 1-2-2. How to troubleshoot (Countermeasure) Case 1) PVDD (36 V) abnormal: Check D951 and replace it. Case 2) If case 1 is not problem: Check IC901 and replace it.

  • Page 85: Power On Error (12 V, 5 Va)

    ONE POINT REPAIR GUIDE 2. POWER ON ERROR (12 V, 5 VA) Fundamental power check points 2-1. 12 V 1) Check 12 V at WFC602. 2) If 12 V is not checked at the point, then find PVDD at pin1 of WIC607. 3) 1), 2) is NG ...

  • Page 86: Power On Error (3.3 Va, 3 V)

    ONE POINT REPAIR GUIDE 3. POWER ON ERROR (3.3 VA, 3 V) MAIN SoC IC supply voltage check points 3-1. 3.3 VA 1) Check 3.3 VA at WL613 nearby WIC609. 2) Check 3.3 VA at pin7, 8 of WIC603. 3) Check 3.3V_PWM at WL611 nearby WIC608. 4) Check 3.3V_PWM at WL615 nearby WIC601.

  • Page 87: Wireless Connection

    ONE POINT REPAIR GUIDE 4. WIRELESS CONNECTION Wireless connection malfunction 4-1. 3.3 VA 1) Check 3.3 VA at WL616. 4-2. Connection 1) Wireless module connection closely. 2) Implement Wireless Factory Reset.   MAIN SET : Soundbar vol MIN and push Mute key (sustain 3 ~ 5 sec). ...

  • Page 88: Circuit Diagrams

    DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter 1. WOOFER SMPS CIRCUIT DIAGRAM PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. COMPONENTS SHOULD BE REPLACED ONLY WITH...

  • Page 89: Woofer Amp Circuit Diagram

    2. WOOFER AMP CIRCUIT DIAGRAM WF-AMP EAX65142702 Rev1.0(0) 2014.01.28 4-10...

  • Page 90: Woofer Key Circuit Diagram

    3. WOOFER KEY CIRCUIT DIAGRAM WF-KEY EAX65385101 Rev1.0(0) 2014.01.28 4-11 4-12...

  • Page 91: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. WOOFER SMPS P. C. BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 4-13 4-14...

  • Page 92: Woofer Amp P. C. Board

    2. WOOFER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3. WOOFER KEY P. C. BOARD 4-15 4-16...
  • Page 93 4-17 4-18...

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