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Copyright © 2018 LG Electronics Inc. All rights reserved.

Only for training and service purposes.

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER/ BT MODULE

YES

YES

YES

YES

Power/ BT

Connect battery.

Check the IC903.

Change the battery.

NO

NO

NO

Check connection
of CN901/CN902.

Is voltage of IC903 3.3 V?

Is voltage of battery

above 6 V?

OK

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Summary of Contents for PK7

Page 1: ...E SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CONFIDENTIAL MODEL PK7 MODEL PK7 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes Portable Bluetooth Speaker P NO AFN78172734 APRIL 2018 ...

Page 2: ...1 1 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS SECTION 1 SUMMARY SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL ...

Page 3: ...ONTENTS PRODUCT SAFETY 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 HIDDEN KEY 1 7 PROGRAM UPDATE GUIDE 1 8 SERVICE INFORMATION VERSION OPTION 1 10 SPECIFICATIONS 1 12 ...

Page 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 ...

Page 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...

Page 6: ... xjhtsix Nmfsljx yt Bluetooth rtij ns utwyfgqj rtij Press j bmjs tz htssjhy ymj utwyfgqj hfgqj0 ymj kzshynts nx hmfslji yt utwyfgqj rtij i 5 _zws it s ymj tqzrj j 5 _zws zu ymj tqzrj k qf x0 ufzxjx tw xpnux uqf gfhp ts ymj Bluetooth rtij flj CD jhjn jx f hfqq ts ymj Bluetooth device Page 13 Xzyjx ymj xtzsi ts ymj utwyfgqj rtij l Nmfsljx rtti qnlmy flj CF xj tnhj htrrfsi tk tzw xrfwy ij nhj wjxx fs...

Page 7: ...ll rights reserved Only for training and service purposes a b c d e f a twy ht jw b DC IN LN fifuyjw nsuzy c PORT IN Wnxyjsx yt rzxnh kwtr tzw utwyfgqj ij nhj d RESET gzyyts e Ntssjhyx y t xujfpjwx ktw izfq uqf Page 25 26 f Ozfq qf LED Rear ...

Page 8: ...d service purposes Description Hidden Key Factory Reset Clear Bluetooth paired list Bluetooth key for 7 seconds Demo wake up Play Pause key with charging condition APD Off Volume 20 Bluetooth Vol_Down key for 2 seconds Bluetooth scan enable Bluetooth key for 2 seconds HIDDEN KEY ...

Page 9: ... for training and service purposes PROGRAM UPDATE GUIDE Step 1 Search and connect speaker Step 2 Select setting Step 3 Select Device version info Step 4 Check new version firmware Install Music Flow Bluetooth app from Google Play Store Only Android Phone supported ...

Page 10: ... Start downloading firmware Step 7 Download from CDN server During update do not off bluetooth connection Step 8 Transfer firmware Caution Recommend airplane mode Bluetooth Wifi enabled During update do not disconnect bluetooth with phone LED rotates blinks while updating firmware When update is finished speaker will be powered off ...

Page 11: ...cs Inc All rights reserved Only for training and service purposes 1 Phone Settings 1 Enable Bluetooth of the mobile device 2 Change name of mobile device to LG_PORT_MP_TEST in Bluetooth Setting Menu SERVICE INFORMATION VERSION OPTION ...

Page 12: ...Check 1 Install Run LG MP App 2 Press Connect Device button on the App 3 Press and Hold Bluetooth Play Pause key on the speaker for 2 seconds 4 A few seconds later you can see Bluetooth pairing request popup message from the mobile device 5 Select Pair and Press Return button on the phone then checksum Version Option will be displayed ...

Page 13: ...utput 19 V 1 7 A Dimensions W x H x D Approx 320 mm x 167 mm x 152 mm Operating temperature 5 C to 35 C Operating humidity 5 to 60 Water proof IPX5 INPUTS PORT IN 0 5 Vrms 3 5 mm stereo jack BATTERY Battery capacity 7 4 Vdc 5200 mAh Typ 7 4 Vdc 5000 mAh Min Operating time Approx 24 hours It may vary depending on the battery status and operational conditions Charging time Less than 3 5 hours with A...

Page 14: ...l rights reserved Only for training and service purposes SECTION 2 CABINET MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS 2 2 ASSEMBLY INSTRUCTIONS 2 7 EXPLODED VIEWS 2 13 1 CABINET AND MAIN FRAME SECTION 2 13 2 PACKING ACCESSORY SECTION 2 15 ...

Page 15: ...ed Only for training and service purposes DISASSEMBLY INSTRUCTIONS 1 Remove the 4 Screws 2 Remove the Side Cover Assembly 3 Remove the Cover Handle Assembly Cover top Unhook the Hooks by inserting the Flat head Screw drivers 4 Remove the Cover Top Assembly ...

Page 16: ...ronics Inc All rights reserved Only for training and service purposes Cover Bottom 5 Remove the Cover Bottom Assembly 6 Remove the 8 Screws 7 Remove the Panel Rear assembly 8 Remove the 6 Screws 9 Remove the MAIN Holder Assembly ...

Page 17: ...ed Only for training and service purposes 10 Disconnect the 2 Harness Cables 11 Remove the 2 Batteries Caution Water proof IPX5 Gasket Rubber should be replaced when disassembling more than 3 times 12 Remove the 12 screws 1szzr 0097X 13 Remove the Speakers ...

Page 18: ... reserved Only for training and service purposes 14 Remove the 4 Screws 1szzr 0097x 15 Remove the 4 Screws FAB31442101 16 Remove the Lightning Tube PCB 17 Remove the Lightning PCB Lightning PCB 18 Remove the 8 Screws 1SZZR 1007B 19 Remove the Grille ...

Page 19: ...2 6 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 20 Remove the 3 Screws 1SZZR 0097X 21 Remove the 2 Screws 1FAB30204501 22 Remove the Jack PCB ...

Page 20: ...G Electronics Inc All rights reserved Only for training and service purposes ASSEMBLY INSTRUCTIONS 1 Assemble the Jack PCB 2 Tighten the 2 Screws 1FAB30204501 3 Assemble the Cover Holder 4 Tighten the 3 Screws 1SZZR 0097X ...

Page 21: ...rvice purposes 5 Assemble the Grille 6 Tighten the 8 Screws 1SZZR 1007B 7 Assemble the SPK Lighting Holder 8 Assemble the Lighting PCB 9 Assemble the Speaker Lens 10 Tighten the 4 Screws FAB31442101 11 Assemble the Lightning Tube PCB and Tighten the 4 Screws 1szzr 0097x Lightning PCB ...

Page 22: ...right 2018 LG Electronics Inc All rights reserved Only for training and service purposes 12 Assemble the Speaker units 13 Tighten the 12 Screws 1szzr 0097x 14 Assemble the 2 Batteries 15 Connect the 2 Connector ...

Page 23: ...nd service purposes 16 Assemble the Holder Main PCB Assembly 17 Tighten the 6 Screws 1SZZR 0097X 18 Assemble the Panel Rear Assembly 19 Tighten the 8 Screws 1SZZR 0097X 20 Assemble Cover Top Bottom to fit hook structure It makes an audible click when the hook is hooked correctly ...

Page 24: ...Only for training and service purposes Based on the LG logo Top surface Front Surface 21 Assemble the Cover Handle Assembly to Set It makes an audible click when the hook is hooked correctly 22 Assemble the Cover R Side Assembly 23 Tighten the 4 Hexagon Screws ...

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

Page 26: ...L A M F G H I K Q G I F N O P E H O K J P N L B A D M C Q J 261 280 260 274 A43 272 275 276 260 277 273 273 A50 A48 A50 A48 269 A45 266 A46 262 262 267 268 277 CABLE1 CABLE2 CABLE4 CABLE3 CABLE5 CABLE6 CABLE6 CABLE5 CABLE7 260R 260L 264 270 530 2 14 2 13 EXPLODED VIEWS 1 CABINET AND MAIN FRAME SECTION ...

Page 27: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 2 16 2 15 300 Power cord 833 Adapter 2 PACKING ACCESSORY SECTION ...

Page 28: ...SOUND IN BLUETOOTH MODE 3 4 4 NO CHARGING BATTERY 3 5 ELECTRICAL TROUBLESHOOTING GUIDE 3 6 1 POWER BT MODULE 3 6 2 POWER AMP 3 7 3 CHARGING BATTERY 3 8 4 KEY LED 3 9 WAVEFORMS OF MAJOR CHECK POINT 3 10 1 MICOM 3 10 2 AMP 3 10 WIRING DIAGRAM 3 11 BLOCK DIAGRAM 3 13 CIRCUIT VOLTAGE CHART 3 15 PRINTED CIRCUIT BOARD DIAGRAMS 3 17 1 MAIN P C BOARD DIAGRAM 3 17 2 KEY P C BOARD DIAGRAM 3 21 3 JACK P C BO...

Page 29: ...voltage CN901 CN902 1 2 How to troubleshoot Countermeasure 1 Check 8 4 V 6 5 V TP BAT TP is not 8 4 V 6 5 V replace battery battery check only 2 Check Q902 FET C908 FET drain is not 8 4 6 5 V replace Q902 during push the power key 3 Check IC903 DCDC C929 is not 3 3 V replace IC903 1 3 Service hint Any picture Remark MAIN board top view MAIN board bottom view CN902 CN902 CN901 CN901 TP BAT TP BAT Q...

Page 30: ... to troubleshoot Countermeasure 1 Check solder of JK301 2 Check FFC cable insert to connector correctly CN900 CN300 3 Check if signal enters or not IC101 13pin 14pin 4 Check the voltage L106 5 V L105 3 3 V of IC101 If voltage is not check check the IC901 5 V IC903 3 3 V 2 3 Service hint Any picture Remark MAIN board top view JACK board top view MAIN board bottom view JACK board bottom view IC901 I...

Page 31: ...n the unit 3 1 Solution Check and replace 3 2 How to troubleshoot Countermeasure 1 Check if BT is in pairing state with your device 2 Check connection of CN901 CN902 and Battery 3 Check battery voltage of CN901 CN902 Pin 1 It should be 6 5 V 8 4 V If voltage is not check change Battery 4 Check signal out Port10 12 I2S of IC100 BT Module If signal is not check check to AMP IC IC700 IC701 5 Check vo...

Page 32: ...t Countermeasure 1 After connect adapter Check the voltage C925 of IC902 If C925 is not 10 V Check voltage L918 19 V If L918 is not 19 V Check FFC cable insert to connector correctly CN900 CN300 2 Check switching signal of coil L913 If switching signal is not check replace IC905 4 3 Service hint Any picture Remark MAIN board top view IC905 IC905 L918 L918 MAIN board bottom view CN900 CN900 L913 L9...

Page 33: ... for training and service purposes ELECTRICAL TROUBLESHOOTING GUIDE 1 POWER BT MODULE YES YES YES YES Power BT Connect battery Check the IC903 Change the battery NO NO NO Check connection of CN901 CN902 Is voltage of IC903 3 3 V Is voltage of battery above 6 V OK ...

Page 34: ...OWER AMP YES YES YES YES YES YES Power AMP Connect battery Check the IC903 IC702 Change the battery Check the IC901 Check the IC906 NO NO NO NO NO Check connection of CN901 CN902 Is voltage of IC903 IC702 3 3 V Is voltage of battery above 6 5 V Is voltage of IC101 5 V L106 Is voltage of IC906 above 6 5 V C964 Check IC700 IC701 AMP IC ...

Page 35: ...AL TROUBLESHOOTING GUIDE 3 CHARGING BATTERY YES YES YES YES YES Charging battery Charging Check the IC902 Check the FFC cable Check the IC905 NO NO NO NO Red LED of battery indication Is voltage of IC902 10 V C925 Is cable insert to connect correctly CN900 CN300 Check the switching signal L913 of IC905 OK ...

Page 36: ...YES YES YES YES YES LED KEY Check the FFC cable CN201 CN100 Check the FFC cable CN201 CN100 Check the BT module IC100 Check the MICOM IC104 Check the BT module IC100 Check the MICOM IC104 NO NO NO NO Is input voltage 5 V CN200 Port19 Is input voltage SPWR 6 5 8 4 V CN200 Port20 Is control Port CN200 Port10 15 Is control Port CN200 Port2 9 OK OK ...

Page 37: ...ts reserved Only for training and service purposes WAVEFORMS OF MAJOR CHECK POINT 1 2 4 5 3 1 MICOM 2 AMP M MICOM_UART_TX MICOM_UART_RX B BCLK LRCLK DATA Fig 2 Bluetooth to AMP I2S IC700 pin23 24 25 Fig 1 MICOM to Bluetooth IC104 pin34 35 2 1 5 4 3 ...

Page 38: ...63270203 4P 1mm ST SMD 6630XE00204 4P 1mm ST SMD 6630XE00204 26P 0 5mm ST SMD Lock EAG38938702 8P 1 25mm ST SMD Lock EAG58732904 5P 2mm ST SMD Lock EAG63270203 4P 2mm ST SMD Lock EAG63270202 8P 1 25mm ST SMD Lock EAG58732904 MIC 26P 0 5mm AG SMD Lock EAG61090203 Battery CN200 KEY 20P 0 5mm ST SMD Lock 6630R FA04T SPK_TR SPK_WL SPK_TL JIG CN401 8P 1 25mm ST SMD Lock EAG58732904 CN400 4P 1 25mm AG S...

Page 39: ... 4 V 6 8 4 V PVDD Power control PWR_SW PWR_CTRL 32 W Battery 7 4 V 5200 mAh 3 3 V KEY MIC MIC_IN MICOM 48PIN SPK Lighting UART For Debug SPI_CLK SO SI CS KEY x 9 LED x 7 LED_A_R G B Indicator ADC IC101 I2 S 5 2 V DCDC IC903 LDO IC900 5 V LDO IC901 SW PVDD Boost IC906 Charging Manage BAT_STAT CHG_CTRL1 2 Tube Lighting LED_B_R G B PWR X Tal 12 288 MHz 19 V 1 7 A 19 V WL WL TL TL AMP IC700 LDO IC702 ...

Page 40: ... 8p SOP8 VIN 2 25 16 V VIN 6 5 8 4 V Vout 5 18 V 7 IC901 LDO 5p SOT25 VIN 2 3 6 V VIN 5 18 V Vout 5 V 8 IC902 DCDC 8p TSOT23 8 VIN 4 5 24 V Vout 0 8 Vin 3 V VIN 19 V Vout 10 3 V 9 IC903 DCDC 6p SOT563 VCC 4 2 17 V VCC 6 5 8 4 V Vout 3 45 V 10 IC904 LDO 8p SOP8 VIN 2 25 16 V VIN 10 3 V Vout 5 02 V 11 IC905 Charger IC 24p QFN VIN 4 5 17 V VIN 10 19 V 12 IC906 Boost IC 10p DGQ VIN 4 5 52 V VIN 6 5 8 ...

Page 41: ...3 17 3 18 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 19 3 20 MAIN P C BOARD DIAGRAM BOTTOM VIEW ...

Page 43: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 21 3 22 2 KEY P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW 3 JACK P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 44: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 23 3 24 4 LED SPK P C BOARD DIAGRAM TOP VIEW 5 LED TUBE P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 45: ...Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes 3 25 3 26 ...

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