LG NP5550B, Service Manual

Page 1: ...L CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only Website http biz lgservice com Portable Bluetooth Speaker MODEL NP5550B NP5550W P NO AFN77272381 SEPTEMBER 2015 MODEL NP5550B NP5550W ...

Page 2: ...1 1 CONTENTS SECTION 1 GENERAL SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 REPLACEMENT PARTS LIST ...

Page 3: ...1 2 SECTION 1 GENERAL CONTENTS ESD PRECAUTIONS 1 3 HIDDEN KEY MODE 1 4 PROGRAM UPDATE GUIDE 1 5 SPECIFICATIONS 1 6 ...

Page 4: ...harges 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 by conductive foam aluminum foil or comparabl...

Page 5: ...onds Bluetooth All Disconnect Paired List All Clear Bluetooth key for 10 seconds Demo Entry Bluetooth Power key for 7 seconds APD OFF Vibe Test Volume FOTA Administrator Mode Volume Up Power key for 2 seconds Forward Skip Pressing the Play Pause key twice Back Skip Pressing the Play Pause key thrice Hardware Measurement Mode Entry Bluetooth Volume Down Play Pause Bluetooth Volume Down Play Pause k...

Page 6: ...LG Audio Bluetooth App you may download on Google Play store 4 FOTA Update Setting menu on the App Check version information FOTA update check FOTA guide in below PROGRAM UPDATE GUIDE Step 1 App setting click Step 4 Check update new version Step 2 Check version information Step 3 FOTA update Step 5 Start downloading firmware Y YG ZG ...

Page 7: ...5 C Operating Humidity 5 to 60 External Connector ø 3 5 mm mini jack Micro USB port for charging battery Communication Bluetooth Speaker Type Built in Impedance Rate 4 Ω Rated Input Power 10 W Max Input Power 20 W Battery Battery capacity 2100 mAh Operating time is approx 15 hours It may vary depending on the battery status and operational conditions Design and specifications are subject to change...

Page 8: ...CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS 2 2 1 HOW TO DISASSEMBLE THE GRILLE 2 2 ASSEMBLY INSTRUCTIONS 2 4 1 HOW TO ASSEMBLE THE GRILLE 2 4 EXPLODED VIEWS 2 7 1 CABINET AND MAIN FRAME SECTION 2 7 2 PACKING ACCESSORY SECTION 2 9 ...

Page 9: ...TRUCTIONS Figure 1 Figure 2 1 Set is placed on top of soft sheet so as not to damage 1 HOW TO DISASSEMBLE THE GRILLE 2 After remove foot on the bottom remove screw of the rear of Bottom screw using a phillips screwdriver ...

Page 10: ...2 3 Figure 3 Figure 4 3 Using a thin flat tool ex A flathead screwdriver push the grille to outside 4 Disassemble grille after holding grille ...

Page 11: ...MBLY INSTRUCTIONS Figure 1 Figure 2 1 Assemble the hook of set to meet with hook of grille 1 HOW TO ASSEMBLE THE GRILLE 2 After the hook of set to meet with hook of grille assemble in the direction of the arrow ...

Page 12: ...2 5 Figure 3 4 Assemble the rear screw 2 EA using a phillips screwdriver ...

Page 13: ...2 6 ...

Page 14: ... 271 A48 457 273 274 457 275 A42 262 A49 263 264 266 266 A46 265 457 265 260A 261 261A BATCNT BATTERY EXPLODED VIEWS 1 CABINET AND MAIN FRAME 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 15: ...Packing 802 Box Owner s manual box 802B 803A 803 Packing Accessory box 802A 801 Owner s manual 820 USB Data cable 2 PACKING ACCESSORY SECTION ...

Page 16: ...VEFORMS OF MAJOR CHECK POINT 3 10 WIRING DIAGRAM 3 11 BLOCK DIAGRAMS 3 13 1 SYSTEM BLOCK DIAGRAM 3 13 2 POWER BLOCK DIAGRAM 3 15 CIRCUIT DIAGRAMS 3 17 1 MAIN AMP CIRCUIT DIAGRAM 3 17 2 MAIN POWER CHARGER CIRCUIT DIAGRAM 3 19 3 KEY LED CIRCUIT DIAGRAM 3 21 4 I O JACK CIRCUIT DIAGRAM 3 23 5 BATTERY JUCNTION CIRCUIT DIAGRAM 3 25 CIRCUIT VOLTAGE CHART 3 27 PRINTED CIRCUIT BOARD DIAGRAMS 3 29 1 MAIN P ...

Page 17: ...OBLEM No power problem occurs when you power on the unit 1 1 Solution Check and replace IC903 on main board 1 2 How to troubleshoot Countermeasure 1 Check battery is enough or not 2 Check 3V3 FB901 FB901 is not 3 3 V replace IC903 Main board bottom view IC903 IC903 FB901 FB901 ...

Page 18: ...2 How to troubleshoot Countermeasure 1 Check solder of JK300 2 Check if signal enters pin2 and pin7 of IC500 3 Check if signal comes out from pin63 66 of IC500 If it doesn t work replace IC500 4 Check if signal comes out from CN700 L L R R If it doesn t work replace IC700 Main board top view I O jack board top view Main board bottom view IC500 IC500 JK300 JK300 CN700 CN700 IC700 IC700 ...

Page 19: ...replace IC500 on main board 3 2 How to troubleshoot Countermeasure 1 Check if bluetooth is in pairing state with your device 2 Check if signal comes out from pin63 66 of IC500 If it doesn t work replace IC500 3 Check if signal comes out from CN700 L L R R If it doesn t work replace IC700 Main board bottom view CN700 CN700 IC700 IC700 Main board top view IC500 IC500 ...

Page 20: ...CHARGING BATTERY Battery is not charged 4 1 Solution Check and replace IC901 on main board 4 2 How to troubleshoot Countermeasure 1 Check voltage of battery 2 Check pin3 of IC901 It should be 4 5 V 5 V 3 Check pin6 of IC901 It should be 3 6 V 4 3 V It doesn t work replace IC901 IC901 IC901 ...

Page 21: ... is voltage of 1 8 VA pin56 Is voltage of SYS_PWR 3 3 V 4 2 V IC903 pin5 3V3 is voltage of 3 3 V FB901 Is voltage of the battery above 3 3 V CN901 NO NO NO NO NO YES YES YES YES YES Power AMP Connect CN700 Replace IC902 OK Charge the battery Check connection of CN700 Does 5 V or 9 V flow IC700 check pin12 14 Is voltage of the battery above 3 3 V CN901 NO NO NO YES YES YES ...

Page 22: ... Replace IC902 Check connection of CN700 Check if signal comes out from IC500 check pin 63 66 Check speaker unit No sound in portable mode Check if signal enters IC500 check pin2 7 Does 5 V or 9 V flow IC700 check pin12 14 NO NO NO NO NO NO YES YES YES YES YES YES YES 2 AMP PORTABLE MODE ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 23: ...ROUBLESHOOTING GUIDE 3 KEY LED KEY LED Check power DSP replace IC903 OK Check power DSP replace IC500 Is input voltage 3 3 VA FB901 Is control high KEY pin4 6 14 15 of CN200 LED pin8 10 12 16 18 of CN200 NO NO YES YES ...

Page 24: ...lace IC901 Check adapter Replace IC901 OK Connect adapter cable Amber LED of Power key blink Is voltage of SYS_PWR 3 3 V 4 2 V IC903 pin5 5 V is voltage of 4 2 V 5 V IC901 pin18 19 Is voltage of DRV5V 4 5 V 5 V IC901 pin3 Check the connection of adapter cable NO NO NO NO NO YES YES YES YES YES ...

Page 25: ...3 10 WAVEFORMS OF MAJOR CHECK POINT 1 CHARGER IC Fig1 Charger IC I2C waveform 1 R904 I2C_SDA Green 2 R905 I2C_SCL Yellow 2 1 2 1 ...

Page 26: ...ET CN900 5 V DC IN CN200 20P 0 5mm ST SMD B to B EAG64673501 KEY LED CN500 20P 0 5mm ST SMD B to B EAG64673601 4P 1 25mm ST Locking SMD EAG58732903 CN700 CN901 6P 1 25mm ST SMD Locking EAG58732906 CN101 6P 1 25mm AG SMD Locking 6630V90141E BATTERY JUCNTION BATTERY CN102 4P 2 5mm AG SMD EAG63189901 3 12 3 11 WIRING DIAGRAM ...

Page 27: ...mAh DC 5 V 5 V 3 5 V 4 3 V 3 3 V 4 3 V mUSB RST CP chip Class 6 3 3 V IC501 COIL 1 5 µH PVCC 3 3V SPK FL Boost TPS61088 IC902 IR MP key JIG LED x 7 FET Q900 DRIVE PVCC 9 V 5 V AMP TPA3131D2 PVCC 9 V IC700 KEY LED RESET RESET DCDC RT6150 IC903 PWON COIL 1 5 µH COIL 2 2 µH Charger IC BQ24262 IC901 S W BAT VBUS SYSTEM FET Q901 3 3 V 4 3 V PWOFF PVCC_SW 3 3 V TR Q905 SYS_V 3 3 V 3 3 V BAT SYS BAT SYS ...

Page 28: ... mUSB 3 3 V FET AMP S FLASH 8 MB LED x 7 CSR8670 CP chip 3 3 V 11 mA 3 3 V 10 mA 3 3 V 30 mA Buck Boost COIL 3 3 µH PVCC PVCC Boost Block TPS61088 9 V 9 V 500 mA FET 3 3 V 6 mA LED x 2 5 V 5 mA 3 3 µH 3 3 µH Charger IC BQ24262 3 16 3 15 2 POWER BLOCK DIAGRAM ...

Page 29: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T AMP EAX66583001_Rev1 7 16 2015 08 13 3 18 3 17 CIRCUIT DIAGRAMS 1 MAIN AMP CIRCUIT DIAGRAM ...

Page 30: ...2 1 WAVEFORM NUMBER A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T POWER CHARGER EAX66583001_Rev1 7 16 2015 08 13 3 20 3 19 2 MAIN POWER CHARGER CIRCUIT DIAGRAM ...

Page 31: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T KEY LED EAX66784101_Rev1 7 16 2015 08 13 3 22 3 21 3 KEY LED CIRCUIT DIAGRAM ...

Page 32: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T I O JACK EAX66743201_Rev1 7 16 _IO 2015 08 13 3 24 3 23 4 I O JACK CIRCUIT DIAGRAM ...

Page 33: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J BATTERY JUCNTION EAX66732401_Rev1 6 14 2015 08 13 3 26 3 25 5 BATTERY JUCNTION CIRCUIT DIAGRAM ...

Page 34: ...FVSSIG Spec TYPE SOIC 208 6 X 5 VCC 2 7 3 6 V VENDER winbond Measure VCC 8 P VCC 3 35 V IC700 AMP Charger IC TPA3132D2 Spec TYPE 32 P PVCC 4 5 26 V VENDER TI Measure PVCC 12 13 14 27 28 29 PVCC 9 09 V IC901 Charger IC BQ24262 Spec TYPE 24 P VIN 1 3 30 V VENDER TI Measure VIN 19 P VDD pin19 4 44 V IC902 Boost TPS61088 Spec TYPE 20 P VIN OUT 0 3 14 5 V VENDER TI Measure VIN 9P VIN 4 15 V VOUT 14 15 ...

Page 35: ...3 30 3 29 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 36: ...3 32 3 31 4 BATTERY JUCNTION P C BOARD TOP VIEW BOTTOM VIEW 2 KEY LED P C BOARD TOP VIEW BOTTOM VIEW 3 I O JACK P C BOARD TOP VIEW BOTTOM VIEW ...

Page 37: ...3 34 3 33 ...