LG LAS855M Service Manual
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LG LAS855M Service Manual

Smart hi-fi audio wireless multi-room sound bar
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Internal Use Only
Website http://biz.lgservice.com
SMART Hi-Fi AUDIO
Wireless Multi-room Sound Bar
SERVICE MANUAL
MODEL: LAS855M
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN77441543
JUNE, 2016

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  • Page 1 Internal Use Only Website http://biz.lgservice.com SMART Hi-Fi AUDIO Wireless Multi-room Sound Bar SERVICE MANUAL MODEL: LAS855M CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN77441543 JUNE, 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 SOFTWARE UPDATE GUIDE ........................1-6 HIDDEN KEY MODE ............................

  • 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: 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_LAS855.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 8 2) Select “HOME -> Settings -> Version Info.” menu then you can see below menu. 3) Select GUI for Update. 4) Waiting for downloading and updating. 5) After Updating fi nish, LAS855M will reboot automatically. You can press ‘OK’ on Application.

  • Page 9: Hidden Key Mode

    HIDDEN KEY MODE 1. Hidden Mode ■ Factory Reset Press “ADD” button for 10 seconds. LAS855M will reboot automatically. ■ Network Reset Press “ADD” button for 5 seconds. ■ Version Check (MICOM, EQ, EQ Checksum, Wireless TX/RX) Volume Minimum state + Remote control “play/pause” with volume “-” button on main unit.
  • Page 10 3. Option Edit 1) PC IP setting 192.168.0.11 Subnet: 255.255.255.0 Gateway: 10.168.0.1 2) Open MP tool and click “AutoUpdate”. 3) Check Option Transmission and select option fi le by “File open” button. 4) Set power on and wait for booting fi nish. 5) Press “ADD”...

  • Page 11: Specifications

    SPECIFICATIONS • GENERAL Power Supply 25 V 2 A (AC adapter) Power consumption 45 W Networked standby : 5.8 W (If all network ports are activated.) AC adapter Model : DA-50F25 Manufacturer: Asian Power Devices Inc. Input: 100 - 240 V ~ 50/60 Hz Output: 25 V Dimensions (W x H x D) 1200 mm x 43 mm x 82 mm (without Foot)
  • Page 12 SECTION 2 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................2-2 1. IF THERE IS NO SOUND OR HAVE A PROBLEM ON LCD..............2-2 2. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET ........... 2-3 3. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET ........... 2-4 4.

  • Page 13: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. IF THERE IS NO SOUND OR HAVE A PROBLEM ON LCD. 1-1. IC601 (NO 12 V) 1-1-1. Solution Replace IC601 on AMP board. 1-1-2. How to troubleshoot (Countermeasure) 1) Please, check 25 VA of IC601 pin7 (VIN). 2) If 25 VA is abnormal, check the parts (L603, F601, JK600).

  • Page 14: If The Set Doesn't Booting When You Turn On The Set

    ONE POINT REPAIR GUIDE 2. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. 2-1. IC304 (NO 5.1 VA) 2-1-1. Solution Replace IC304 on MAIN board. 2-1-2. How to troubleshoot (Countermeasure) 1) Please, check 25 VA of IC304 pin7 (VIN). 2) If 25 VA is abnormal, check the parts (MAIN board: L312, R367, CN104, AMP board: F601, CN600, JK600).
  • Page 15 ONE POINT REPAIR GUIDE 3. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. 3-1. IC301 (NO VCC_5V) 3-1-1. Solution Replace IC301 on MAIN board. 3-1-2. How to troubleshoot (Countermeasure) 1) Please check 5.1 VA of IC301 pin1 (VIN). 2) If 5.1 VA is abnormal, follow the stage 2-1 (IC304).

  • Page 16: If The Set Doesn't Booting When You Turn On The Set (Led Does Not Turn On)

    ONE POINT REPAIR GUIDE 4. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. (LED DOES NOT TURN ON) 4-1. IC309 (NO 3.4 VA) 4-1-1. Solution Replace IC309 on MAIN board. 4-1-2. How to troubleshoot (Countermeasure) 1) Please check 25 VA of IC309 pin7 (VIN). 2) If 25 VA is abnormal, check the parts (MAIN board: L313, R345, CN104, AMP board: F601, CN600, JK600).

  • Page 17: If The Set Doesn't Booting When You Turn On The Set

    ONE POINT REPAIR GUIDE 5. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. 5-1. IC302 (NO D_3.3V) 5-1-1. Solution Replace IC302 on MAIN board. 5-1-2. How to troubleshoot (Countermeasure) 1) Please, check D_3.3V of IC302 pin6 (VOUT). 2) If D_3.3V is abnormal, follow the stage 4-1 (IC309).

  • Page 18: If There Is No Sound

    ONE POINT REPAIR GUIDE 6. IF THERE IS NO SOUND. 6-1. IC307 (NO PWM_3.3V) 6-1-1. Solution Replace IC307 on MAIN board. 6-1-2. How to troubleshoot (Countermeasure) 1) Please check PWM_3.3V of IC307 pin6 (VOUT). 2) If PWM_3.3V is abnormal, follow the stage 4-1 (IC309). 3) If 3.4 VA is OK, please check R338.

  • Page 19: If The Set Doesn't Booting When You Turn On The Set

    ONE POINT REPAIR GUIDE 7. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. 7-1. IC300 (NO 1.5 V / 1.2 V) 7-1-1. Solution Replace IC300 on MAIN board. 7-1-2. How to troubleshoot (Countermeasure) 1) Please check 5.1 VA of L300 (VIN). 2) If 5.1 VA is abnormal, follow the stage 2-1 (IC304).

  • Page 20: If The Set Doesn't Booting When You Turn On The Set (Led Does Not Turn On)

    ONE POINT REPAIR GUIDE 8. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. (LED DOES NOT TURN ON) 8-1. IC100 (MICOM doesn’t work) 8-1-1. Solution Replace IC100 on MAIN board. 8-1-2. How to troubleshoot (Countermeasure) 1) Check 3.4 VA of IC100 pin48 (VIN). 2) If 3.4 VA is abnormal, follow the stage 4-1 (IC309).

  • Page 21: Sound From The R Ch Speaker

    ONE POINT REPAIR GUIDE 9. NO SOUND FROM THE R ch SPEAKER. 9-1. IC7000 (NO 25 VA / 12 V) 9-1-1. Solution Replace IC7000 on AMP board. 9-1-2. How to troubleshoot (Countermeasure) 1) Please check C7003 for 25 VA of IC7000, 12 V of R7000. ...

  • Page 22: Sound From The L Ch Speaker

    ONE POINT REPAIR GUIDE 10. NO SOUND FROM THE L ch SPEAKER. 10-1. IC7001 (NO 25 VA / 12 V) 10-1-1. Solution Replace IC7001 on AMP board. 10-1-2. How to troubleshoot (Countermeasure) 1) Please check C7038 for 25 VA of IC7001, 12 V of R7014. ...

  • Page 23: If Not Booting When You Turn On The Set

    ONE POINT REPAIR GUIDE 11. IF NOT BOOTING WHEN YOU TURN ON THE SET. 11-1. IC501 (MPEG IC) 11-1-1. Solution Replace IC501 on MAIN board. (This chip is so hard to change IC, so we recommend to change PCB.) 11-1-2. How to troubleshoot (Countermeasure) 1) Check physical status of IC501 on your eyes.
  • Page 24 ONE POINT REPAIR GUIDE 12. IF NOT BOOTING WHEN YOU TURN ON THE SET. 12-1. IC503, IC504 (DDR IC) 12-1-1. Solution Replace IC503, IC504 on MAIN board. (This chip is so hard to change IC, so we recommend to change PCB.) 12-1-2.

  • Page 25: If Not Booting When You Turn On The Set

    ONE POINT REPAIR GUIDE 13. IF NOT BOOTING WHEN YOU TURN ON THE SET. 13-1. IC505 (NAND Flash Memory IC) 13-1-1. Solution Replace IC505 on MAIN board. 14-1-2. How to troubleshoot (Countermeasure) 1) Check D_3.3V of R512, R511 and C5B1. 2) If D_3.3V is abnormal, follow the stage 5-1 (IC302).

  • Page 26: Wired Network Connection Error

    ONE POINT REPAIR GUIDE 14. WIRED NETWORK CONNECTION ERROR. When you connect AP through the wired LAN, connection failed. 14-1. Ethernet Jack (JK202) 14-1-1. Solution Replace JK202 on MAIN board. 14-1-2. How to troubleshoot (Countermeasure) 1) If there is soldering problem, please re-soldering pin JK202. 2) If after re-soldering, problem still occurs, replace JK202.

  • Page 27: Portable Function Doesn't Working

    ONE POINT REPAIR GUIDE 15. PORTABLE FUNCTION DOESN’T WORKING 15-1. IC200 15-1-1. Solution Replace IC200 on MAIN board. 15-1-2. How to troubleshoot (Countermeasure) 1) Check VCC_5V of L204. If VCC_5V is abnormal, follow the stage 3-1 (IC301). 2) Check D_3.3V of L207. If D_3.3V is abnormal, follow the stage 5-1 (IC302). 3) If VCC_5V and D_3.3V are OK, check the PTB_DET is high state when portable cable connected (R128).

  • Page 28: Optical Function Doesn't Working

    ONE POINT REPAIR GUIDE 16. OPTICAL FUNCTION DOESN’T WORKING 16-1. Optical Jack (JK201) 16-1-1. Solution Replace JK201 on MAIN board. 16-1-2. How to troubleshoot (Countermeasure) 1) If there is soldering problem, please re-soldering pin JK201. 2) Check 3.4 VA of L203. 3) Check the OPT_DET and OPT_SPDIF show signal when optical cable connected (R205, R207).

  • Page 29: Bluetooth Function Doesn't Working

    ONE POINT REPAIR GUIDE 17. BLUETOOTH FUNCTION DOESN’T WORKING 17-1. Bluetooth module 17-1-1. Solution Replace Bluetooth module. 17-1-2. How to troubleshoot (Countermeasure) 1) Check 3.4 VA of L208. 2) Check the BT_RST (R157).  If it’s weird, follow the stage 8-1 (IC100). ...

  • Page 30: Hdmi Function Doesn't Working

    ONE POINT REPAIR GUIDE 18. HDMI FUNCTION DOESN’T WORKING 18-1. IC501 18-1-1. Solution Replace IC501 on MAIN board. (This chip is so hard to change IC, so we recommend to change PCB.) 18-1-2. How to troubleshoot (Countermeasure) 1) Check HDMI_5.1VA of L800. 2) If It is abnormal, follow the stage 2-1 (IC304).

  • Page 31: Wi-Fi Function Doesn't Working

    ONE POINT REPAIR GUIDE 19. Wi-Fi FUNCTION DOESN’T WORKING 19-1. Wi-Fi module 19-1-1. Solution Replace Wi-Fi module or IC501 on MAIN board. (This chip is so hard to change IC, so we recommend to change PCB.) 19-1-2. How to troubleshoot (Countermeasure) 1) Check Wi-Fi cable state.

  • Page 32: Wireless Woofer Connection Doesn't Working

    ONE POINT REPAIR GUIDE 20. WIRELESS WOOFER CONNECTION DOESN’T WORKING 20-1. Wireless module and IC305 20-1-1. Solution Replace Wireless module or IC305 on MAIN board. 20-1-2. How to troubleshoot (Countermeasure) 1) Try to connect MAIN set and subwoofer according to the factory reset step. 2) If it is OK, change the wireless module, and try again.

  • Page 33: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER / MICOM / LCD Does the LED Is R141 Replace micom (IC100). blinking? low state? Pin4 of CN400 Replace LCD. should be 5 V. Pin1 of IC301 Replace IC301. should be 5.1 VA. Does IC304 work? Replace IC304.

  • Page 34: Wi-Fi

    ELECTRICAL TROUBLESHOOTING GUIDE 2. Wi-Fi L317 Does Wi-Fi cable Replace Wi-Fi module. should be 3.4 VA. connection OK? Connect cable again. Pin7 of IC309 Pin2 of IC309 should be high. should be 25 VA. Check IC309. L313 Replace IC309. should be 25 V. Check adaptor.

  • Page 35: Amp / Pwm

    ELECTRICAL TROUBLESHOOTING GUIDE 3. AMP / PWM Set turns on but there is no sound. Check the connection Connect CN803 & CN804. of CN803 & CN804. PVDD should be Check adaptor. 25 VA (C7038). Pin2 of IC601 GVDD should be should be high Replace IC601.

  • Page 36: Pairing Bluetooth

    ELECTRICAL TROUBLESHOOTING GUIDE 4. PAIRING BLUETOOTH Connect FFC. Check the connection of FFC. Check power. L208 should be 3.4 VA. BT_RST should be high Check micom (IC100). (pin1 of CN202). Change BT module. Check MPEG (IC501). If it still doesn’t work 2-25...

  • Page 37: Optical

    ELECTRICAL TROUBLESHOOTING GUIDE 5. OPTICAL ‘Optical’ should be displayed, when optical cable is connected well. Check power. L203 should be 3.4 VA. OPT_SPDIF signal Check optical cable. should be shown (R207). Check MPEG (IC501). Even though all of above things are OK, there is no sound. Check AMP.

  • Page 38: Portable

    ELECTRICAL TROUBLESHOOTING GUIDE 6. PORTABLE ‘Portable’ should be displayed, when portable cable is connected well. Signal should be flow Check cable. (C203, C204). Check power. L204 should be 5 V. L207 should be 3.3 V. Check CLK Check MPEG (IC501). (R215, R216, R220).

  • Page 39: Hdmi

    ELECTRICAL TROUBLESHOOTING GUIDE 7. HDMI ‘HDMI IN’ should be displayed, when HDMI cable to HDMI IN is connected well. L800 should be 5 V. Check HDMI OUT cable. Check MPEG (IC501). Pin7 of IC304 Replace IC304. should be 25 VA. Check power.

  • Page 40: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. MPEG X-TAL 27 MHz: R510 2. PWM X-TAL 24.576 MHz: X600 2-29...

  • Page 41: Micom (Eeprom)

    3. MICOM (EEPROM) EEPROM IC101 pin5, 6 at booting time of the system 4. MPEG I2S between MPEG and PWM 2-30...

  • Page 42: Wiring Diagram

    WIRING DIAGRAM TI version TI version TI ver Wireless TX Wi-Fi Wi- - F F i i 2P, 1.25 mm ST, Lock , SMD (EAG60989201) 10P, 0.5 mm ADAPTER 5P, 2 mm ST, Non_Lock , SMD AG, Lock , SMD (EAG61090207) 26P, 2 mm (6630VK19605)

  • Page 43: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM TACT PWM_RST/MUTE/I2C_DAT/I2C_CLK LCD_DO/CLK PORTABLE PCM1808 M_BCK/LRCK/DATA0,1,2,3 PS9860 /STB/RMC Slave FRONT 160 W EEPROM EEP_CLK/DAT 24.576 MHz (2 KB) MICOM PWR_SENS AZ7027 60 W PTB_DET TAS5612 RENESAS 48P AMP_PROTECT/PDN/SD_OTW/CLIP 20 W BT_DET/RX OPT_DET PWM_DATA1~4 60 W WL_RST/DAT/CLK/MUTE/INT/MSG_RDY I2C/HPD/CEC/EDID_SW TAS5612...

  • Page 44: Power Block Diagram

    2. POWER BLOCK DIAGRAM RMS output 40/8 x 2 = 10 W, 5/8 x 16 = 20 W 400mA_RMS Power Measurement condition: 20 W 3200mA_RMS Measurement condition Peak output 1k 0dB Measurement condition: 160 W (mW) 25 VA 40 x 2 = 80 W, 5 x 16 = 80 W 6400mA_8.3ms_Dynamic condition Instantaneous peak condition : 160 W Adapter...

  • Page 45: Circuit Diagrams

    CIRCUIT DIAGRAMS 1. MAIN - MICOM CIRCUIT DIAGRAM MICOM EAX66524801 Rev1.4(10) MAIN(#1) 2016.06.17 2-37 2-38...

  • Page 46: Main - Mpeg Circuit Diagram

    2. MAIN - MPEG CIRCUIT DIAGRAM MPEG EAX66524801 Rev1.4(10) MAIN(#2) 2016.06.17 2-39 2-40...

  • Page 47: Main - Memory Circuit Diagram

    3. MAIN - MEMORY CIRCUIT DIAGRAM MEMORY EAX66524801 Rev1.4(10) MAIN(#3) 2016.06.17 2-41 2-42...

  • Page 48: Main - Adc & I/O Circuit Diagram

    4. MAIN - ADC & I/O CIRCUIT DIAGRAM ADC & I/O EAX66524801 Rev1.4(10) MAIN(#4) 2016.06.17 2-43 2-44...

  • Page 49: Main - Dc-Dc Circuit Diagram

    5. MAIN - DC-DC CIRCUIT DIAGRAM DC-DC EAX66524801 Rev1.4(10) MAIN(#5) 2016.06.17 2-45 2-46...

  • Page 50: Amp - Pwm Circuit Diagram

    6. AMP - PWM CIRCUIT DIAGRAM EAX66524901 Rev1.4(10) AMP(#1) 2016.06.17 2-47 2-48...

  • Page 51: Amp - Amp Circuit Diagram

    7. AMP - AMP CIRCUIT DIAGRAM EAX66524901 Rev1.4(10) AMP(#2) 2016.06.17 2-49 2-50...

  • Page 52: Front Circuit Diagram

    8. FRONT CIRCUIT DIAGRAM FRONT EAX66525001 Rev1.4(10) 2016.06.17 2-51 2-52...

  • Page 53: Key Circuit Diagram

    9. KEY CIRCUIT DIAGRAM EAX66525101 Rev1.4(10) 2016.06.17 2-53 2-54...

  • Page 54: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs Designator Description Specifi cation Pin Number Voltage Spec Real Value IC100 IC,Microcontrollers R5F100GHAFB VDD: #48 VDD: 1.6 V ~ 5.5 V VDD: 3.36 V IC101 IC,EEPROM M24C16-RMN6TP VCC: #8 VCC: 1.8 V ~ 5.5 V VCC: 3.2 V IC102 IC,Serial Flash Memory...

  • Page 55: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 2-57 2-58...

  • Page 56: Amp P. C. Board Diagram

    2. AMP P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 4. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 2-59 2-60...
  • Page 57 2-61 2-62...
  • Page 58 SECTION 3 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................3-3 1. MAIN SET SECTION ..........................3-3 2. WIRELESS SUBWOOFER SECTION ...................... 3-5 3. PACKING ACCESSORY SECTION ......................3-7...

  • Page 60: Exploded Views

    EXPLODED VIEWS 1. MAIN SET SECTION A80R 280R CABLE4 CABLE3 Wi-Fi MAIN CABLE1 FRONT A80L 280L CABLE2...

  • Page 61: 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 LITERATURE. A900 A900W CN901 A47W SMPS A49W A54W WIRELESS 300W A45W...

  • Page 62: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 801 Owner’s manual 806 Optical cable 829 Cable tie 831 LAN cable 830 Cable holder (Clamp) 833 AC Adapter 300 Power cord 835 Wall bracket 836 Screws (2) 900 Remote control 837 Cover foot (2) 808 Batteries (2) 803 Packing, main 804 Bag 802 Box...
  • Page 63 3-10...
  • Page 64 SECTION 4 WIRELESS SUBWOOFER PART CONTENTS ONE POINT REPAIR GUIDE ..........................4-2 1. NO POWER PROBLEM (PVDD) ......................4-2 2. POWER ON ERROR ..........................4-3 3. POWER ON ERROR ..........................4-4 4. WIRELESS CONNECTION ........................4-5 WAVEFORMS OF MAJOR CHECK POINT ...................... 4-6 1.

  • Page 65: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER PROBLEM (PVDD) No power problem occurs when you power on the unit 1-1. Solution If you check these points and find PVDD voltage is not checked, replace woofer SMPS board. 1-2. Service hint (Any picture / Remark) PVDD PVDD pin3, 4, 5, 6 at WCN601...

  • Page 66: Power On Error

    ONE POINT REPAIR GUIDE 2. POWER ON ERROR Fundamental power check points 2-1. 12 V 1) Check 12 V at WL604 nearby WL603 coil. 2) If 12 V is not checked at the point, then find PVDD at pin7 of WIC606. 3) 1), 2) is NG ...
  • Page 67 ONE POINT REPAIR GUIDE 3. POWER ON ERROR MAIN SoC IC supply voltage check points 3-1. 3.3 VA 1) Check 3.3 VA at WCA603 and WL627. 2) Check 3.3V_PWM at pin5 of WIC605. 3) Check 3.3 VA at pin7, 8 of WIC603. 4) Check 3.3V_PWM at WL615 nearby WIC601.

  • Page 68: 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 69: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. VOLTAGE FIG 1-1. WIC607 3.7 VA FIG 1-2. PWM 3.3 V FIG 1-3. Wireless 3.3 VA...

  • Page 70: Amp Voltage

    2. AMP VOLTAGE PVDD: 34.5 V FIG 2-1. Woofer PVDD FIG 2-2. Woofer 12 V...

  • Page 71: Pwm

    3. PWM FIG 3-1. Woofer PWM SW+ SIgnal FIG 3-2. Woofer PWM SW- SIgnal...

  • Page 72: Led

    4. LED FIG 4-1. Pairing Off Status  Red LED FIG 4-2. Pairing On Status  Yellow LED...
  • Page 73 4-10...

  • Page 74: Wiring Diagram

    WIRING DIAGRAM WOOFER AMP Wireless module PN901, DIP, 2P WOOFER WCN602, SMD, 24P, B to B (Power Cord) CN901, Harness Cable, (Wireless module) WCN601, DIP, 10P PAIRING KEY WCN604, DIP, 2P JK401, Harness Cable, WCN603, DIP, 2P WOOFER SMPS PCB (SWF) WCN605, DIP, 3P (LED CNT)

  • Page 75: Block Diagram

    BLOCK DIAGRAM PVDD PWM_SW+ WOOFER PWM_SW- WOOFER PWM 3.3 3.7 V PVDD DC-DC 12 V Wireless 3.3 Flash PVDD DC-DC 4-13 4-14...

  • Page 76: 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 77: Woofer Amp Circuit Diagram

    2. WOOFER AMP CIRCUIT DIAGRAM WF-AMP : WAVEFORM NUMBER EAX66304702 Rev1.1(3) 2016.06.17 4-17 4-18...

  • Page 78: Woofer Key Circuit Diagram

    3. WOOFER KEY CIRCUIT DIAGRAM WF-KEY EAX66305402 Rev1.1(3) 2016.06.17 4-19 4-20...

  • Page 79: 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. 4-21 4-22...

  • Page 80: Woofer Amp P. C. Board

    2. WOOFER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3. WOOFER KEY P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 4-23 4-24...
  • Page 81 4-25 4-26...

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