LG SL4Y Service Manual Download Page 30

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3-8

Only for training and service purposes.

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, LCD doesn’t work.

1-4. LCD System power VCC_5V

1-4-1. Solution

Replace MAIN/ LCD Module.

1-4-2. How to troubleshoot (Countermeasure)

1) Please check CN502 VCC_5V of CN502 pin1.

2) If VCC_5 V is abnormal, replace MAIN board.

3) If VCC_5 V OK, replace LCD module.

1-4-3. Service hint (Any picture / Remark)

< MAIN board top view >

R405

R407

R 4 0 8

R 4 0 9

R3A3

R3A4

R3A5

R3A6

C N 4 0 2

R5A5

X401

C 5 A 1

C 5 A 2

F 3 0 0

F 3 0 1

C431

C 4 3 2

C433

C434

C435

C436

C437

C 4 3 8 C 4 3 9

C 4 4 0

C446

Q 3 0 0

Q 3 0 1

Z D 5 0 4

L 3 0 0

L 3 0 1

L 3 0 2

F M

R R 5 0 3

RR505

RR506

RR507

RR508

RR509

RR510

RR511

RR512

RR513

RR514

RR515

RR516

RR517

FB303

F B 3 0 4

FB305

F B

R 3 0 3

R C F 5 0 0

F B 3 1 4

F B 3 1 6

JK502

FB318

R 3 0 8

R 3 1 0

R 3 1 2

R315

RC502

RC509

R 3 2 7

CN500

CN502

R 5 2 8

R338

R339

C 3 0 0

R4C3

C 3 0 7

C308

C309

C310

5 4 0

C311

R 5 4 1

C 3 1 2

C 3 1 3

C314

C315

C316

C317

C318

C319

R549

C4A4

C 3 2 0

C4A5

C321

C4A6

C322

R 5 5 2

C 3 2 3

R365

R 5 5 9

R366

R368

C 3 3 0

C 3 3 1

5 6 1

C 3 3 3

R370

C 3 3 4

R 3 7 1

R375

R380

R381

T P _ G N D

C 5 4 7

C354

C 5 4 8

C 5 4 9

C355

C356

WR505

WR506

WR507

WR508

WR509

D301

WR510

C364

WR511

WR512

WR513

C367

C370

C 3 7 9

L406

L 4 0 7

IC300

C 3 8 1

I C 3 0 1

C 3 8 2

IC302

C 3 8 3

I C 3 0 9

C390

IC310

IC311

C 3 9 1

WC502

C 3 9 2

C 3 9 3

I C 3 1 3

WC503

C 3 9 4

WC504

C 3 9 5

WC505

WC506

WC509

WC513

WC514

WC515

WC519

WC520

WC522

WC523

R4N4

FB401

R4N5

FB402

F B 4 0 3

F B 4 0 4

R4N8

R 5 F 2

R 5 F 1

C 5 F 2

C 5 F 1

F B 5 1 0

I C 4 0 2

C5F6

2.2uF

3.3VA

FB510

PZ1608U221-1R4TF

LED-

LCD_STB

C5F1

100nF

C5F2

10uF

/10V(M)

VB0-

DGND

LCD_DAT

3.3VA

LCD_CD

R5F2

220 (M)

VCC_5V

R5F1

220 (M)

DGND

R5F5

C5F3

10nF

R5F4

R5F3

R5F8

10M

LCD_STB

LCD_BL

R5F6

DGND

VLCD

R5F7

C5F5

0.33uF

LCD_DAT

VB1-

LCD_RST

LCD_CLK

LCD_CD

VB0+

VB1+

LED+

C5F4

2.2uF

LCD_CLK

LCD_RST

CN502

1 VLCD

2 VBO+

3 VB1+

4 VB1-

5 VB0-

6 VSS

7 VDD

8 SDA

9 SCK

10 CD

11 RSTB

12 CSB

13 LED-(K)

14 LED+(A)

Q502

1 COMMON

2 OUT

Front_LCD

CN502

Summary of Contents for SL4Y

Page 1: ...vice purposes Wireless 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 inc...

Page 2: ...Copyright 2019 LG Electronics 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 ...

Page 3: ...ly for training and service purposes SECTION 1 GENERAL CONTENTS ESD PRECAUTIONS 1 3 LOCATION OF CUSTOMER CONTROLS 1 4 WIRELESS SUBWOOFER CONNECTION 1 5 REAR SPEAKERS CONNECTION SOLD SEPARATELY 1 6 HIDDEN KEY MODE 1 7 FIRMWARE UPDATE GUIDE 1 8 SPECIFICATIONS 1 11 ...

Page 4: ...ified as anti static can generate electrical charges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together...

Page 5: ...ndow will brighten Remote sensor Standby Switches the unit ON or OFF F Function Select the function and input source by pressing F repeatedly Input source Function Display Optical LG Sound Sync Wired OPT Bluetooth BT LG Sound Sync Wireless LG TV USB USB Volume Adjusts volume level DC IN Connect to the AC adapter OPTICAL IN Connect the OPTICAL IN jack on the back of the unit to OPTICAL OUT jack on ...

Page 6: ...reless subwoofer does not make sound To solve the problem follow the steps below 1 Press PAIRING button on the rear of the wireless subwoofer The yellow green LED on the rear of the wireless subwoofer blinks quickly If the green LED does not blink press and hold the PAIRING 2 Turn on the sound bar Pairing is completed The yellow green LED on the front of the wireless subwoofer turns on Note It tak...

Page 7: ...r 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 ...

Page 8: ...reserved Only for training and service purposes HIDDEN MODE KEYS EEPROM EDIT Main unit Volume Remote control NIGHT ON EEPROM CLEAR Initialize Main unit Volume Remote control ASC VERSION CHECK Main unit Volume Remote control Play Pause HIDDEN KEY MODE ...

Page 9: ...Device with Music Flow Bluetooth App for FOTA update Version Check APP for Version Check Take care not to power off during update Do format USB memory before update FAT32 f le system FIRMWARE UPDATE GUIDE Main Unit Necessary Wireless Subwoofer Unit If wireless subwoofer rx module of primary unit is updated USB Memory for USB update Rear Speaker Unit Optional as model suff x If wireless rear rx mod...

Page 10: ...o USB memory Step 3 Power on SL5 SL6 main unit Step 4 If there is an updated wireless subwoofer rx binary in update list you need to pair between main unit and subwoofer unit before start update Step 5 If there is an updated wireless rear rx binary in update list you need to pair between main unit and rear speaker unit before start update Step 6 Press Function key to change function to USB Verify ...

Page 11: ...Press Set Vol RCU Play Pause for 3secs 2 SL4Y shows the version of all modules in the order shown below The order that SL4Y shows version in version check hidden mode DSP Wireless Subwoofer Tx Wireless Subwoofer Rx Wireless Rear Tx Wireless Rear Rx PEQ Option 3 Compare the version VFD shows and you updated Module VFD display sample DSP Wireless Subwoofer Tx Wireless Subwoofer Rx Wireless Rear Tx W...

Page 12: ...tput Total 300 W RMS Front 50 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 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 Max Input Power 400 W Dimensions W x H x D Approx 171 0 mm x 390 0 mm x 261 0 mm SPK8...

Page 14: ...d Only for training and service purposes SECTION 2 CABINET MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS 2 2 1 HOW TO DISASSEMBLE THE MAIN SET 2 2 EXPLODED VIEWS 2 7 1 MAIN UNIT SECTION 2 7 2 WIRELESS SUBWOOFER SECTION 2 11 3 PACKING ACCESSORY SECTION 2 15 ...

Page 15: ...19 LG Electronics Inc All rights reserved Only for training and service purposes DISASSEMBLY INSTRUCTIONS Figure 1 2 Figure 1 1 1 HOW TO DISASSEMBLE THE MAIN SET 2 Remove the Case Bottom Assembly 1 Remove the 19 screws ...

Page 16: ...rights reserved Only for training and service purposes Figure 1 4 Figure 1 3 HOW TO DISASSEMBLE THE MAIN SET 4 Remove the SPK Chamber L R Assembly 3 Remove the 2 screws Disconnect the Harmess FFC cables KEY SPK and Remove the Main PCB Assembly ...

Page 17: ...tronics Inc All rights reserved Only for training and service purposes Figure 1 6 Figure 1 5 HOW TO DISASSEMBLE THE MAIN SET 6 Remove the 4 screws and Disconnect FFC cables BT Wireless 5 Remove the L R Deco Assembly BT Wireless ...

Page 18: ...ht 2019 LG Electronics Inc All rights reserved Only for training and service purposes Figure 1 8 Figure 1 7 HOW TO DISASSEMBLE THE MAIN SET 8 Remove the EMI Shield Tape of Bottom side 7 Remove the EMI Shield Tape ...

Page 20: ...rved Only for training and service purposes F H CABLE1 C D B T A52 264 CABLE2 MAIN F J J D C A B B G A46 WIRELESS A54 CABLE3 I G I A A42 262 266 A41 H 253 A55 CABLE5 CABLE6 CABLE4 WIRELESS A54 265 E EXPLODED VIEWS 1 MAIN UNIT SECTION 2 7 2 8 A80R A80L ...

Page 21: ... 954 955 D E WIRELESS SMPS AMP B A G E D B F G C C F 958 A900 951 A45W A47W CN901 A49W A54W 959 A 300W 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 ...

Page 22: ...ectronics 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 837 Holder foot 806 Optical cable Optional Part 3 PACKING ACCESSORY SECTION ...

Page 23: ...NIT ON NO MESSAGE OR HELLO ON FRONT PANEL 3 5 2 NO SOUND 3 9 3 PROTECTION ERROR 3 12 ELECTRICAL TROUBLESHOOTING GUIDE 3 14 1 ADAPTER POWER CIRCUIT 3 14 2 KEY PART 3 23 3 USB FUNCTION 3 24 4 OPTICAL FUNCTION 3 25 WAVEFORMS OF MAJOR CHECK POINT 3 26 1 CRYSTAL 3 26 2 FLASH MEMORY 3 26 3 TACT KEY 3 27 4 USB 3 28 5 REMOTE CONTROL 3 29 6 OPTICAL 3 30 7 FM 3 31 CIRCUIT VOLTAGE CHART 3 33 PRINTED CIRCUIT ...

Page 24: ...USB CN506 CN503 LCD WIRELESS MODULE REAR BOX WIRELESS MODULE WOOFER BT MODULE O O PTICAL TUNER 26 PIN FFC CABLE 26 PIN FFC CABLE 12 PIN FFC CABLE 2 PIN HARNESS REMOCONE CN502 JK300 DC JACK CN704 CN703 CN505 FR FL MAIN PCB 1 2T FR4 4LAYER KEY PCB 1 2T FR4 2LAYER CN504 14 PIN FFC CABLE WIRING DIAGRAM ...

Page 25: ... Rx WL_MUTE INT_WF MSG_RDY_WF WL_CLK_WF DAT_WF 5 GHz BCK LRCK ADATA2_WF SPI Flash 1 MB Wireless Module TX OPT_IN OPT_DET Optical IN AMP 27Mhz USB PLAYBACK POWER FUNC VOL MAIN SoC IC501 Crescendo 3 IC402 TUNER TUNER_CE CLK DAT RST 32 768 KHz ADAPTOR 25 V Wireless Rear Box Wireless Module Rx WL_MUTE INT_RR MSG_RDY_RR WL_CLK_RR DAT_RR 5 GHz BCK LRCK ADATA2_RR SPI Flash 1 MB Wireless Module TX TUNER_L...

Page 26: ...ng TR 12 V 1 35 V 5 1 VA VD33USB VD33PLL VD33 LDO 350 mA NC 20 mA 10 mA 50 mA IC302 IC300 IC303 AMP Front LED 4ea Switch P_CTRL P_CTRL IC309 IC312 10 mA 100 mA 10 mA 20 mA 100 mA 100 mA VCC33 Q301 USB LCD 500 mA USB_5 V Switch IC306 VD33 3 3 VA 3 3 VA DCDC IC301 Switch WL_P_CTRL_WF IC310 VD33ADAC VD33AADC 10 mA NC TUNER 50 mA TUNNER_3 3 V LDO IC311 WIRELESS Module RBOX_3V3 100mA Switch WL_P_CTRL_R...

Page 27: ...7 1 0 C N 5 0 0 1 1 1 2 CN502 1 3 1 4 1 5 1 8 1 9 R 5 2 8 R 3 3 8 R 3 3 9 2 2 2 3 C 3 0 0 R 4 C 3 C 3 0 7 C 3 0 8 C 3 0 9 C 3 1 0 5 4 0 C 3 1 1 R 5 4 1 C 3 1 2 C 3 1 3 C 3 1 4 C 3 1 5 C 3 1 6 C 3 1 7 C 3 1 8 C 3 1 9 R 5 4 9 C 4 A 4 C 3 2 0 C 4 A 5 C 3 2 1 C 4 A 6 C 3 2 2 R 5 5 2 C 3 2 3 R 3 6 5 R 5 5 9 R 3 6 6 R 3 6 8 C 3 3 0 C 3 3 1 5 6 1 C 3 3 3 R 3 7 0 C 3 3 4 R 3 7 1 R 3 7 5 R 3 8 0 R 3 8 1 C ...

Page 28: ...3 0 2 F M R R 5 0 3 R R 5 0 5 R R 5 0 6 R R 5 0 7 R R 5 0 8 R R 5 0 9 R R 5 1 0 R R 5 1 1 R R 5 1 2 R R 5 1 3 R R 5 1 4 R R 5 1 5 R R 5 1 6 R R 5 1 7 F B 3 0 3 F B 3 0 4 F B 3 0 5 F B R 3 0 3 R C F 5 0 0 F B 3 1 4 F B 3 1 6 J K 5 0 2 F B 3 1 8 R 3 0 8 R 3 1 0 R 3 1 2 R 3 1 5 R C 5 0 2 0 3 0 4 0 5 0 6 R C 5 0 9 R 3 2 7 1 0 C N 5 0 0 1 1 1 2 CN502 1 3 1 4 1 5 1 8 1 9 R 5 2 8 R 3 3 8 R 3 3 9 2 2 2 3 ...

Page 29: ... R 5 4 7 R 5 4 8 X 5 0 0 C 5 1 0 M C L K R 5 5 0 C 5 1 5 R 5 5 1 C 3 2 2 R 5 5 2 C 5 1 7 R 5 5 3 C 3 2 4 C 5 1 8 R 5 5 4 R 5 5 5 C 3 2 6 R 5 5 6 C 3 2 7 R 5 5 7 C 3 2 9 R 5 5 9 R 5 6 0 C 3 3 1 5 0 1 R 5 6 1 R 5 6 2 C 3 3 3 R 5 6 3 C 3 3 4 R 5 6 4 R 5 6 5 C 3 3 5 R 5 6 6 C 3 3 7 R 5 6 8 C 3 3 9 R 5 6 9 R 5 7 4 R 5 7 5 R 5 7 6 O C P R 5 7 8 R 5 7 9 R 5 8 0 C 5 4 4 R 5 8 1 C 5 4 5 R 5 8 2 C 5 4 6 R 5...

Page 30: ...2 2 2 3 C 3 0 0 R 4 C 3 C 3 0 7 C 3 0 8 C 3 0 9 C 3 1 0 5 4 0 C 3 1 1 R 5 4 1 C 3 1 2 C 3 1 3 C 3 1 4 C 3 1 5 C 3 1 6 C 3 1 7 C 3 1 8 C 3 1 9 R 5 4 9 C 4 A 4 C 3 2 0 C 4 A 5 C 3 2 1 C 4 A 6 C 3 2 2 R 5 5 2 C 3 2 3 R 3 6 5 R 5 5 9 R 3 6 6 R 3 6 8 C 3 3 0 C 3 3 1 5 6 1 C 3 3 3 R 3 7 0 C 3 3 4 R 3 7 1 R 3 7 5 R 3 8 0 R 3 8 1 C T P _ G N D C 5 4 7 C 3 5 4 C 5 4 8 C 5 4 9 C 3 5 5 C 3 5 6 W R 5 0 5 W R ...

Page 31: ... R C 5 2 3 R 5 3 1 R 5 3 2 R 5 3 3 C 3 0 4 R 5 3 4 R 5 4 0 R 5 4 1 C 5 0 5 R 5 4 2 C 5 0 6 R 5 4 3 R 5 4 4 R 5 4 7 R 5 4 8 C 5 1 0 M C L K C 5 1 3 R 5 5 0 R 5 5 1 C 5 1 9 R 5 5 5 R 5 6 0 C 3 3 1 W F B 5 0 1 R 5 6 2 C 3 3 3 R 5 6 3 C 3 3 4 R 5 6 4 R 5 6 5 C 3 3 5 R 5 6 6 R 5 6 8 R 5 6 9 R 5 7 4 R 5 7 5 R 5 7 6 O C P R 5 7 8 R 5 7 9 R 5 8 0 C 5 4 4 R 5 8 1 C 5 4 5 R 5 8 2 C 5 4 6 R 5 8 3 R 5 8 5 R 5...

Page 32: ...0 2 R 3 1 0 R 3 1 5 R C 5 0 2 R C 5 0 3 R C 5 0 4 R C 5 0 5 R C 5 0 6 R C 5 0 9 R C 5 1 0 R C 5 1 1 R C 5 1 2 CN502 R C 5 1 3 R C 5 1 4 R C 5 1 5 R C 5 1 6 CN506 R C 5 1 7 R C 5 1 8 R C 5 1 9 R 5 2 8 R C 5 2 2 R C 5 2 3 C 3 0 0 R 4 C 3 C 3 0 7 C 3 0 8 C 3 1 0 5 4 0 R 5 4 1 C 3 1 2 C 3 1 3 C 3 1 R 5 4 9 C 4 A 4 C 3 2 0 C 4 A 5 C 4 A 6 C 3 2 3 C 3 3 1 C 3 3 3 R 3 7 0 C 3 3 4 R 3 7 1 R 3 7 5 R 3 8 0 ...

Page 33: ... 1 4 R C 5 0 9 R 5 1 5 R 5 1 6 R 5 1 9 R C 5 1 0 R C 5 1 1 R C 5 1 2 CN50 R C 5 1 3 CN503 R C 5 1 4 CN504 R C 5 1 5 R C 5 1 6 CN506 R C 5 1 7 R C 5 1 8 R C 5 1 9 R 5 2 5 R 5 2 6 R 5 2 9 R C 5 2 2 R C 5 2 3 R 5 3 1 R 5 3 2 R 5 3 3 C 3 0 4 R 5 3 4 R 5 4 0 R 5 4 1 C 5 0 5 R 5 4 2 C 5 0 6 R 5 4 3 R 5 4 4 R 5 4 7 R 5 4 8 C 5 1 0 M C L K C 5 1 3 R 5 5 0 R 5 5 1 C 5 1 9 R 5 5 5 R 5 6 0 C 3 3 1 W F B 5 0 ...

Page 34: ...3 A 6 R 5 A 5 R 7 A 1 F L 2 F L 2 R 7 C 2 R 7 C 3 C 5 A 1 C 5 A 2 F 3 0 0 F 3 0 1 C 7 C 5 C 7 C 6 Q 3 0 0 Q 3 0 1 Z D 5 0 4 L 3 0 2 K E Y _ G L709 L710 F B 3 0 3 J K 3 0 0 F B 3 1 3 F B 5 0 7 R C F 5 0 0 F B 5 0 8 C N 5 0 5 R 5 2 8 CN703 R 3 3 8 CN704 R 3 3 9 C 3 0 0 C 3 0 1 C 3 0 7 C 5 0 3 C 3 1 1 C 3 1 2 C 3 1 3 C 3 1 5 C 3 1 7 C 3 2 0 C 3 2 3 R 3 6 5 R 3 6 6 R 3 8 0 R 3 8 1 C 3 4 7 C 3 4 8 R 3 ...

Page 35: ...1 2 if 12V has problem refer to STEP 1 1 2 If 12 V is OK replace MAIN board 3 2 3 Service hint Any picture Remark IC703 IC703 AMP_FAULT C738 1uF C736 100pF R7A3 0 R782 100 C731 100nF AMP_PROTECT R775 47K PGND R783 NC PGND DC_PROTECTION R702 27K C739 1uF PGND R777 100 C730 1uF R715 47K R703 10K ZD702 Z02W3 9V NC 1 2 3 C706 100pF VCC33 IC703 26 GND 1 GVDD_AB 11 GND 35 OUT_B 3 OC_ADJ 8 DVDD 6 INPUT_B...

Page 36: ... purposes ELECTRICAL TROUBLESHOOTING GUIDE IC301 is not 3 3 VA Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check R308 Voltage 3 3 VA Replace Main PCB Replace Main PCB YES YES NO NO OK 1 ADAPTER POWER CIRCUIT ...

Page 37: ...e purposes ELECTRICAL TROUBLESHOOTING GUIDE ADAPTER POWER CIRCUIT IC303 is not 1 3 VA Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check R314 Voltage 1 3 VA Replace Main PCB Replace Main PCB YES YES NO NO OK ...

Page 38: ... and service purposes ELECTRICAL TROUBLESHOOTING GUIDE Q301 is not 12 V Check F301 Voltage 25 VA Check Adapter Replace Main PCB NO YES NO Check FB304 Voltage 12 VA Check R774 Voltage 12 V Check Q301 2pin Voltage 12 V Check IC302 YES YES YES NO NO OK OK ADAPTER POWER CIRCUIT YES ...

Page 39: ...ice purposes ELECTRICAL TROUBLESHOOTING GUIDE USB_5V is not 5 V Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check FB306 Voltage 5 V Replace Main PCB Replace Main PCB YES YES NO NO OK ADAPTER POWER CIRCUIT ...

Page 40: ...ce purposes ELECTRICAL TROUBLESHOOTING GUIDE Tuner is not 3 3 V Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check R311 Voltage 3 3 V Replace Main PCB Replace Main PCB YES YES NO NO OK ADAPTER POWER CIRCUIT ...

Page 41: ...oses ELECTRICAL TROUBLESHOOTING GUIDE VD33ADAC_VD33AADC is not 3 3 V Check F301 Voltage 25 VA Check FB305 Voltage 5 1 V A Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check FB311 Voltage 3 3 V Replace Main PCB Replace Main PCB YES YES NO NO OK ADAPTER POWER CIRCUIT ...

Page 42: ...UBLESHOOTING GUIDE VCC33 is not 3 3 V Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check R308 Voltage 3 3 VA Replace Main PCB Replace Main PCB YES YES NO NO Check FB313 Voltage 3 3 V Replace Main PCB YES NO OK ADAPTER POWER CIRCUIT ...

Page 43: ...UBLESHOOTING GUIDE ADAPTER POWER CIRCUIT WL_3V3 is not 3 3 V Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check R308 Voltage 3 3 VA Replace Main PCB Replace Main PCB YES YES NO NO Check FB314 Voltage 3 3 V Replace Main PCB YES NO OK ...

Page 44: ...BLESHOOTING GUIDE ADAPTER POWER CIRCUIT RBOX_3V3 is not 3 3 V Check F301 Voltage 25 VA Check FB305 Voltage 5 1 VA Check Adapter Replace Main PCB YES YES YES NO NO Check FB304 Voltage 12 VA Check R308 Voltage 3 3 VA Replace Main PCB Replace Main PCB YES YES NO NO Check FB316 Voltage 3 3 V Replace Main PCB YES NO OK ...

Page 45: ...ervice purposes ELECTRICAL TROUBLESHOOTING GUIDE KEY PART Replace the Cable1 Check R520 Pull up Resistor YES Check CN505 1 2 pin Voltage 3 3 V Check the connecting cables Check RA01 RA04 RA05 RA06 Replace the Key PCB YES NO Check SWA01 SWA02 SWA03 SWA04 OK YES YES NO NO OK 2 KEY PART ...

Page 46: ...ervice purposes ELECTRICAL TROUBLESHOOTING GUIDE USB PART Refer to Power Part Troubleshooting Check JK501 1pin Voltage 5 1 V YES Check FB306 Voltage 5 1 V Check IC306 Check JK501 pin2 D pin3 D Replace Main PCB YES NO Check Reading OK IC501 pin35 pin36 YES YES NO NO OK 3 USB FUNCTION ...

Page 47: ...and service purposes ELECTRICAL TROUBLESHOOTING GUIDE OPTICAL FUNCTION Refer to Power Part Troubleshooting Check IC501 pin65 Input waveform Check C511 Replace Main PCB YES NO OK 4 OPTICAL FUNCTION Replace Main PCB Check R549 3 3VA Voltage YES Check JK502 Check R528 YES YES NO NO ...

Page 48: ...Y FIG 1 X500 27 MHz 1 4 3 5 2 C550 100nF DGND DGND SF_CS R559 0 OHM 1 NC R552 0 OHM 1 IC504 1 CS 2 SO 3 WP 4 VSS 5 SI 6 SCLK 7 HOLD 8 VCC R536 10K R539 10K R537 10K R538 10K FB504 PZ1608U221 1R4TF 3 3VA For DSP 2MB 1 R518 510K X500 27MHz 1 IN OUT 2 FLOAT 3 IN OUT 4 FLOAT DGND C518 10pF C517 10pF R556 0 R557 100 FIG 2 VCC CS CLK DO 2 3 4 5 VCC CS CLK DO ...

Page 49: ... 4 7K R553 100 R567 0 NC R588 10K C564 1nF R530 0 R519 47K KEY AMP_CLIP0 IC501 84 RESET_B 85 SPI_CS2 86 SPI_CS3 87 SPI_CLK 88 SPI_DI 89 SPI_DO 90 SPI_WP 91 SPI_HOLD 92 SPDIF_OUT 93 SYS_ADC_A 94 SYS_ADC_B 95 SYS_ADC_C 96 SYS_ADC_D 97 PWM_VREF 98 VD33ADAC 99 VS33ADAC DGND VD33 3 3VA DC_PROTECTION R520 4 7K R554 100 DGND RA01 680 RA03 1K RA02 820 RA00 CA00 100nF SWA00 1 2 3 4 SWA01 1 2 3 4 SWA02 1 2 ...

Page 50: ...c All rights reserved Only for training and service purposes 4 USB FIG 4 1 USB 5 V FIG 4 2 USB D 7 8 FIG 4 3 USB D 9 9 8 7 USB_GND USB5V USB_N USB_P JK501 1 5V 2 D 3 D 4 DGND C544 100nF DGND USB_5V D502 D503 3 1 2 C546 10uF C545 220uF USB ...

Page 51: ... Voltage 10 FIG 5 2 Low Timing 11 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 5 3 High Timing 12 11 10 12 IR RECEIVER REMOCON DGND C5A1 100nF R5A5 100 C549 100pF 3 3VA C5A2 10uF ZD504 Z02W3 9V 1 2 3 RCF500 1 GND 2 VCC 3 OUT 4 GND REMO_TP ...

Page 52: ...AMP_FAULT AMP_PDN LCD_DAT LCD_STB P_CTRL WL_P_CTRL_WF REMOCON UART_RX UART_TX IC501 60 SR 16 61 SR 17 62 SR 22 63 SR 23 64 SR 24 65 SR 25 66 SR 26 67 AUX 7 68 AUX 6 69 AUX 5 70 AUX 4 71 VD33 72 SR 10 73 SR 11 74 OP 16 75 AUX 3 76 AUX 2 77 AUX 1 78 AUX 0 79 VD3318 80 VSS33 VSS 81 VD3318 82 VD33 83 VDD VD33 R527 3 9K OPT_DET R514 100 R566 100 WL_INT_RR WL_MSG_RDY_RR R515 100 LCD_RST LCD_CD LCD_CLK L...

Page 53: ...2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 27 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V...

Page 55: ...DO IC Vin 1 Vout 5 Vin 2 3 V 6 V Vin 5 22 V Out 3 4 V IC313 Switch IC Vin 5 Vout 1 Vin 2 5 V 5 5 V out 0 V 5 5 V Vin 3 34 V out 3 33 V IC500 RESET VCC 3 VCC 1 0 V 7 V VCC 3 35 V IC501 MAIN DSP VDD 20 52 83 VDDAADC 121 VD33 7 18 25 54 71 79 81 82 VD33PLL 41 VD33USB 37 VD33ADAC 98 116 VD33AADC 126 VDD 1 3 V 5 VDDAADC 1 3 V 5 VD33 3 3 V 5 VD33PLL 3 3 V 5 VD33USB 3 3 V 5 VD33ADAC 3 3 V 5 VD33AADC 3 3 ...

Page 56: ... I C 3 0 1 C 3 8 2 I C 3 0 2 C 3 8 3 I C 3 0 3 C 5 7 7 I C 3 0 6 C 3 8 7 C 3 8 8 I C 3 0 9 C 7 7 1 C 7 7 2 C 7 7 3 C 7 7 4 I C 5 0 1 C 7 7 7 C 3 9 0 I C 3 1 0 C 7 7 8 I C 3 1 1 C 3 9 1 C 7 7 9 W C 5 0 2 I C 3 1 2 C 3 9 2 C 3 9 3 I C 3 1 3 W C 5 0 3 C 3 9 4 W C 5 0 4 C 5 8 8 C 3 9 5 W C 5 0 5 W C 5 0 6 C 3 9 6 C 3 9 8 C 7 8 0 W C 5 0 9 C 7 8 3 C 7 8 4 C 7 8 5 C 7 8 6 W C 5 1 0 W C 5 1 1 W C 5 1 2 W...

Page 57: ... 38 3 37 NC VOL VOL POWER FUCN EAX68503501 VER1 3 SL4 SL5 KEY BOARD FR4 2L 1 2T 2018 12 07 PCB SIZE 40 6X30 T P A 0 0 T P A 0 1 S W A 0 0 S W A 0 1 S W A 0 2 S W A 0 3 S W A 0 4 R A 0 0 R A 0 1 R A 0 2 R A 0 3 R A 0 4 R A 0 5 R A 0 6 C A 0 0 C N A 0 0 2 KEY P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 59: ...IR 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 VOLTAGE 4 6 2 AMP VOLTAGE 4 7 3 PWM 4 8 4 LED 4 9 WIRING DIAGRAM 4 11 BLOCK DIAGRAM 4 13 PRINTED CIRCUIT BOARD DIAGRAMS 4 15 1 WOOFER SMPS P C BOARD 4 15 2 WOOFER AMP P C BOARD 4 17 3 WOOFER KEY P C BOARD 4 17 ...

Page 60: ...olution If you check these points and find PVDD voltage is not checked replace woofer SMPS board 1 2 Service hint Any picture Remark Woofer AMP board bottom view Woofer AMP board top view PVDD PVDD pin3 4 5 6 at WCN601 pin3 4 5 6 at WCN601 PVDD PVDD pin7 at WIC606 pin7 at WIC606 Nearby WC610 Nearby WC610 PVDD PVDD pin7 at WIC607 pin7 at WIC607 Nearby WC686 Nearby WC686 PVDD PVDD at WCA601 at WCA60...

Page 61: ...s NG Replace WIC606 If you can t check PVDD voltage then you replace woofer SMPS board 2 2 3 7 VA 1 Check 3 7 VA at WL606 coil 2 If 3 7 VA is not checked at the point then find PVDD at pin7 of WIC607 3 1 2 is NG Replace WIC607 If you can t check PVDD voltage then you replace woofer SMPS board Woofer AMP board top view Woofer AMP board top view 12 V 12 V at WL604 at WL604 PVDD PVDD at pin7 of WIC60...

Page 62: ...603 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 If all voltages are OK then check the PVDD voltage of woofer SMPS board Woofer AMP board top view 3 3V_PWM 3 3V_PWM at WL615 at WL615 3 3 VA 3 3 VA at WCA603 WL627 at WCA603 WL627 3 3 VA 3 3 VA at pin7 8 of WIC603 at pin7 8 of WIC603 3 3V_PWM 3 3V_PWM at pin5 of WIC605 at pin...

Page 63: ...reless Factory Reset MAIN SET Soundbar vol MIN and push Mute key sustain 3 5 sec Subwofer Push Pairing key on the back case 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 KEY board top view Woofer AMP board top view 3 3 VA 3 3 VA at WL616 at WL616 Wireless mod...

Page 64: ...pyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes WAVEFORMS OF MAJOR CHECK POINT 1 VOLTAGE FIG 1 1 WIC607 3 7 VA 1 FIG 1 2 PWM 3 3 V 2 FIG 1 3 Wireless 3 3 VA 3 3 2 1 ...

Page 67: ...4 9 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes 4 LED FIG 4 1 Pairing Off Status Red LED 8 FIG 4 2 Pairing On Status Yellow LED 9 9 8 ...

Page 69: ...nly for training and service purposes DIP 2pin SWF Harness Cable 12Pin FFC SMD 24 Pin straight Dip 2Pin Power Cord SMPS PCB AMP PCB Harness 12Pin Connector Pairing Key 2Pin Harness Cable 2Pin Pairing Key PCB LED CNT Wireless module 4 12 4 11 WIRING DIAGRAM ...

Page 70: ...ctronics Inc All rights reserved Only for training and service purposes WOOFER AMP PVDD WOOFER AMP SW LPF DC DC DC DC LDO PVDD PVDD PWM 3 3 Wireless 3 3 3 7 V LDO PWM PWM_SW PWM_SW 12 V SW LPF Flash 4 14 4 13 BLOCK DIAGRAM ...

Page 71: ...nc All rights reserved Only for training and service purposes 4 16 4 15 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 ...

Page 72: ...Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes 4 18 4 17 2 WOOFER AMP P C BOARD 3 WOOFER KEY P C BOARD TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

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