LG SJ9 Service Manual
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LG SJ9 Service Manual

Smart hi-fi audio. wireless multi-room sound bar
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CONFIDENTIAL
SMART Hi-Fi AUDIO
Wireless Multi-room Sound Bar
SERVICE MANUAL
MODEL: SJ9
(SJ9, SPJ9B-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN77558542
JANUARY, 2015
"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."
Copyright © 2017 LG Electronics Inc. All right reserved.
Only for training and service purposes.

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  • Page 1 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.”...
  • Page 2 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..WIRELESS SUBWOOFER PART Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    • ELECTROSTATICALLY SENSITIVE (ES) DEVICES NAME OF EACH COMPONENT ........................1-5 WIRELESS SUBWOOFER CONNECTION ....................... 1-6 HIDDEN KEY MODE ............................1-7 SOFTWARE UPDATE GUIDE ........................... 1-8 SPECIFICATIONS ............................1-16 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • 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

    Note 1: Accessible Conductive Parts include Metal panels, tricity sufficient to damage an ES device.) Input terminals, Earphone jacks,etc. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: Name Of Each Component

    - / + (Volume) F HDMI OUT (TV ARC) : (Wi-Fi): G HDMI IN (Add): (In case one or more Music Flow products are connected.) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: Wireless Subwoofer Connection

    2. Turn on the sound bar. 3. Pairing is completed. - The green LED on the front of the wireless subwoofer turns on. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: Hidden Key Mode

    Main unit “MIN” (volume minimum state) + Remote control ' (Mute)' for about 5 seconds. Woofer RX Reset ‘RESET’ on the woofer for 3 seconds. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Software Update Guide

    5) During the update, LCD is displayed as like below. D-UPDATE M-UPDATE B-UPDATE H-UPDATE MICOM HDMI EQUPDATE WRITE 00 SEND 00 WIRELESS(TX) WIRELESS(RX) 6) After update fi nish, power will be off automatically. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 Power on Smart Audio and implement Music Flow App in your smart phone. 1) Connect Speaker. 2) Select red box. 3) Settings -> Version Info. 4) Select Device version info. Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 5) Display “Need to update” if there are ※ Display new version info new fi rmware in the server. if you press “Need to update”. 6) Start Update below icon. 1-10 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 Using APP 7) Display update info. ※ Do not power off during update. 8) Display “Update is completed” message when Complete update. 1-11 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 3. Using MP tool 1) Open MP tool and select “Key DN”. 2) Check the section for download and open download fi le. 1-12 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 ※ Caution : Do not you update the B/E program and MICOM program at the same time. 6) Connect Status change “OK!” if success connect MP tool. 1-13 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Using MP tool 7) Press “Update” button. 8) Download result display “OK!” if start download. 1-14 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 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 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 17: Specifications

    Integrated IEEE 802.11n (Draft 2.0) wireless networking access, compatible with 802.11a/b/g/n Wi-Fi networks. • Designs and specifications are subject to change without prior notice. 1-16 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 2. HOW TO DISASSEMBLE THE SUBWOOFER ..................2-11 EXPLODED VIEWS ............................2-17 1. MAIN UNIT SECTION ..........................2-17 2. WIRELESS SUBWOOFER SECTION ....................2-19 3. PACKING ACCESSORY SECTION ....................... 2-21 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 19: Disassembly Instructions

    ※ Before begin, position the Main Unit upside down. 1-1. Case Bottom Assembly 1) Remove the 36 screws. 2) Remove the Case Bottom Assembly. Cover Bottom Assembly Figure 1-1 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 20: How To Disassemble The Main Unit

    1) Disconnect the 3 SPK cables from the Main PCB. < SPK cable > Figure 1-2 (1) 2) Remove the 4 screws. 3) Remove the Cover SMPS. Cover SMPS Figure 1-2 (2) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 WIRELESS Figure 1-3 (1) 2) Remove the 3 screws. 3) Remove the Main Chassis Assembly. (Main Chassis + PCBA) Main Chassis Assembly Figure 1-3 (2) Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 3) Remove the JACK PCB Sub Assembly. 4) Remove the 6 screws. 5) Remove the JACK PCB Assembly. JACK PCB Sub Assembly JACK PCB Figure 1-3-2 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Figure 1-3-3 1-3-4. MAIN PCB Assembly 1) Disconnect the cables. 2) Remove the screw. 3) Remove the MAIN PCB Assembly. MAIN PCB Wi-Fi Figure 1-3-4 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 HOW TO DISASSEMBLE THE MAIN UNIT 1-3-5. Wi-Fi Module 1) Remove the screw. 2) Remove the Wi-Fi holder. 3) Remove the Wi-Fi module. 4) Disconnect the cable. Figure 1-3-5 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 2) Disconnect the 2 hooks and then remove the BT module. 3) Disconnect the FFC cable from the WIRELESS module. 4) Disconnect the 2 hooks and then remove the WIRELESS module. WIRELESS Figure 1-4 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 1-6. KEY PCB Assembly 1) Remove the 2 screws. 2) Disconnect the 5 hooks and then remove the KEY PCB Assembly. KEY PCB Figure 1-6 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 When assembling, place the SPK network cables as shown in the fi gure below. Center SPK cable Left SPK cable Right SPK cable Figure 1-7 2-10 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 2) Remove the 8 screws. Figure 2-1 (1) 3) Pull out the Sub-Woofer Board Assembly and disconnect the SPK cable. Sub-Woofer Board Assembly SPK cable Figure 2-1 (2) 2-11 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 29: How To Disassemble The Subwoofer

    2-2. SMPS PCB Assembly 1) Disconnect the 2 cables. (AMP and Power cord) 2) Remove the 4 screws. 3) Remove the SMPS PCB Assembly. SMPS Figure 2-2 2-12 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 1) Disconnect the 3 cables. (WIRELESS, LED and KEY) WIRELESS Figure 2-3 (1) 2) Remove the 4 screws. 3) Remove the AMP PCB Assembly. Figure 2-3 (2) 2-13 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 3) Disconnect the cable. WIRELESS Figure 2-4 2-5. LED PCB Assembly 1) Remove the 2 screws. 2) Remove LED PCB Assembly. 3) Disconnect the cable. Figure 2-5 2-14 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 2) Remove KEY PCB Assembly. Figure 2-6 2-7. How to organize cables When assembling, place the cables as shown in the fi gure below. Figure 2-7 2-15 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 2-16 Copyright © 2018 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 34: Exploded Views

    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. A44A A80R HDMI+JACK CABLE4 MAIN WIRELESS CABLE3 CABLE2 Wi-Fi CABLE5 SMPS FRONT...

  • Page 35: 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 A331 SAFETY INFORMATION IN SERVICE LITERATURE. A330 A332 SMPS A81M WIRELESS A81S A81A A81L A81K 2-19 2-20...

  • Page 36: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 801 Owner’s manual 835 Wall bracket 806 Optical cable 829 Cable tie 836 Screws (2) 900 Remote control 808 Batteries (2) 803 Main packing 804 Bag 802 Box 2-21...
  • Page 37 2-22...
  • Page 38 SECTION 3 ELECTRICAL CONTENTS WIRING DIAGRAM ............................3-2 BLOCK DIAGRAMS ............................3-3 1. SYSTEM BLOCK DIAGRAM ........................3-3 2. POWER BLOCK DIAGRAM ........................3-4 ONE POINT REPAIR GUIDE ..........................3-5 1. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR “HELLO” ON FRONT PANEL ..........................

  • Page 39: Wiring Diagram

    WIRING DIAGRAM...

  • Page 40: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM BUFFER...

  • Page 41: Power Block Diagram

    2. POWER BLOCK DIAGRAM...

  • Page 42: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR “HELLO” ON FRONT PANEL When you turn on your set, 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.
  • Page 43 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. 1-2. IC303 System 3.3 V (No 3.3 VA) 1-2-1.
  • Page 44 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 12 V, VCC_5V (No 12 V, VCC_5V) 1-3-1.
  • Page 45 ONE POINT REPAIR GUIDE 2. NO SOUND 2-1. BLUETOOTH 2-1-1. Solution Replace Bluetooth module/ MAIN board. 2-1-2. How to troubleshoot (Countermeasure) 1) Please check status of Bluetooth cable connection (at CN201 and BT Module). 2) Please check 3.3 VA (at pin1 of CN201). If 3.3 V is OK, please check BT_RST, BT_UART_RX,BT_UART_TX, BT_SCL, BT_SDA (pin2, 5, 7, 9, 10).

  • Page 46: Sound

    ONE POINT REPAIR GUIDE 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.
  • Page 47 ONE POINT REPAIR GUIDE 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.
  • Page 48 ONE POINT 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.
  • Page 49 ONE POINT REPAIR GUIDE 3. PROTECTION ERROR No display or No Sound. 3-1. D(DC) PROTECTION 3-1-1. Solution Replace MAIN board. 3-1-2. How to troubleshoot (Countermeasure) 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+, SRL-, TOP R+, TOP R-, FR R+, FR R- (CN702 pin8, 7, 5, 4, 2, 1).

  • Page 50: Protection Error

    ONE POINT REPAIR GUIDE PROTECTION ERROR No display or 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.
  • Page 51 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 20 V of IC706, IC708, IC707, IC710 at pin17, 18, 19, 31, 32, if 12 V has problem refer to STEP 1-1.

  • Page 52: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL Fig 1-1. Crystal Fig 1-2. Crystal X501 (27 MHz) X801 (27 MHz) 3-15...
  • Page 53 CRYSTAL Fig 1-3. Crystal Fig 1-4. Crystal X603 (12.288 MHz) X601 (25 MHz) 3-16...

  • Page 54: Flash

    2. FLASH 3. TACT KEY About : 1.67 V Fig 2. Flash Fig 3-1. Tact Key VCC/ CS#/ CLK/ DO Press Power Key About : 1.35 V Fig 3-2. Tact Key Press FUNC Key About : 1.09 V Fig 3-3. Tact Key Press VOL(-) Key 3-17...

  • Page 55: Tact Key

    TACT KEY About : 3.34 V About : 0.77 V Fig 3-4. Tact Key Fig 3-7. Tact Key Press VOL(+) Key Press No Key About : 0.45 V Fig 3-5. Tact Key Tact Key Press Wi-Fi Key About : 0 V Fig 3-6.

  • Page 56: Remote Control

    4. REMOTE CONTROL Fig 4-1. Remote Control Fig 4-3. Remote Control Input Voltage High Timing Item Measured Spec. IR Receiver Spec: Input Level 3.3 V 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 4-2.

  • Page 57: Optical

    5. OPTICAL Fig 5-1. Optical Fig 5-2. Optical Opt In Opt Det 3-20...

  • Page 58: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs Location Name Pin No Pin Name Spec Measured Voltage Location Name Pin No Pin Name Spec Measured Voltage IC100 MICOM 87, 38, 16, 64 1.8 V ~ 3.6 V 3.342 V LPSBV 4.5 V ~ 5.5 V 5.05 V IC101 Serial Flash...

  • Page 59: Printed Circuit Board Diagrams

    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. 3-23 3-24...
  • Page 60 2. MAIN P. C. BOARD DIAGRAM (TOP VIEW) 3-25 3-26...

  • Page 61: Main P. C. Board Diagram

    MAIN P. C. BOARD DIAGRAM (BOTTOM VIEW) 3-27 3-28...

  • Page 62: Hdmi/ Jack P. C. Board Diagram

    3. HDMI/ JACK P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-29 3-30...

  • Page 63: Front P. C. Board Diagram

    4. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 5. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-31 3-32...
  • Page 64 SECTION 4 WIRELESS SUBWOOFER PART CONTENTS WIRING DIAGRAM ............................4-2 BLOCK DIAGRAM ............................4-3 ONE POINT REPAIR GUIDE ..........................4-4 1. NO POWER PROBLEM ......................... 4-4 2. POWER ON ERROR (12 V, 5 VA) ......................4-6 3. POWER ON ERROR (3.3 VA, 3 V) ......................4-7 4.

  • Page 65: Wiring Diagram

    WIRING DIAGRAM...

  • Page 66: Block Diagram

    BLOCK DIAGRAM Rear SPK Connector Woofer SPK Connector...

  • Page 67: 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 68 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 69: 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 70: 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 71: 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 72: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL 2. FLASH MEMORY Fig 1. Crystal Fig 2. Flash Memory WX602 (24.576 MHz)

  • Page 73: Voltage

    3. VOLTAGE Fig 3-1. Woofer PVDD Fig 3-2. Woofer 12 VA 4-10...
  • Page 74 VOLTAGE Fig 3-3. Woofer 3.3 VA Fig 3-4. Woofer 3.3V_PWM 4-11...

  • Page 75: Amp Voltage

    4. AMP VOLTAGE Fig 4-1. AMP PVDD Fig 4-2. AMP 12 V 4-12...

  • Page 76: Pwm

    5. PWM Fig 5-1. Woofer PWM SW+ Signal Fig 5-2. Woofer PWM SW- Signal 4-13...

  • Page 77: Led

    6. LED Fig 6-1. Pairing Off Status  Red LED Fig 6-2. Pairing On Status  Green LED 4-14...

  • Page 78: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs Location Name Pin No Pin Name Spec Measured Voltage 16, 25, 30, 33, VDD_IO 2.97 V ~ 3.63 V 3.332 V 37, 42, 50 WIC601 22, 45 VDD_CORE 1.08 V ~ 1.32 V 1.21 V WIC603 Serial Flash 2.7 V ~ 3.6 V...

  • 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. 4-17 4-18...

  • Page 80: Woofer Amp P. C. Board

    2. WOOFER AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3. WOOFER KEY P. C. BOARD 4-19 4-20...
  • Page 81 4-21 4-22...

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