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LG NP8350 Service Manual Download Page 31

 3-2

ONE POINT REPAIR GUIDE

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

1. NO POWER PROBLEM

No power problem occurs when you power on the unit.

1-1. Solution

Check and replace IC901 on main board.

1-2. How to troubleshoot (Countermeasure)

1) Check 3.4 VA (C916). 



 C916 is not 3.4 VA, replace IC901. 

2) Check X501 (Crystal). 



 If it does not oscillate, replace X501.

< Main board top view >

X501

X501

C916

C916

IC901

IC901

Summary of Contents for NP8350

Page 1: ...AL SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only Website http biz lgservice com JULY 2015 MODEL NP8350 MODEL NP8350 SMART Hi Fi AUDIO P NO AFN77272348 ...

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 LIST 1 4 PROGRAM UPDATE GUIDE 1 5 SPECIFICATIONS 1 11 ...

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: ...n Key Description Demo Wake Up Function Power key for 7 seconds Factory Reset Add key for 10 seconds Wi Fi Disable Wi Fi Power Off Wi Fi setup key for 5 seconds Wi Fi Reset Add key for 3 seconds HIDDEN KEY LIST ...

Page 6: ...PC or Mac Media server software allows you to access audio files stored in media server PC Mac or Network storage and enjoy them on your speaker via home networking On www lg com website type model name in the search bar and find media server software on support tab Windows Music Flow PC Software Mac OS Nero MediaHome 4 Essentials Caution Note for using Media Server On your PC or Mac you must shar...

Page 7: ...ATE BY Music Flow Player APP BE MICOM MEQ is only possible Step 3 Select Version info Step 4 Select Device version info Step 1 Connect speaker Step 2 Select settings Install and run Music Flow Player app with next steps ...

Page 8: ...1 7 Step 5 Check Need to update Step 6 System version check Step 7 Select update button Step 8 Download from CDN Server ...

Page 9: ...1 8 Step 9 FW flash writing Step 10 Update is completed CAUTION Do not power off NP8350 Music Flow until update is complete When the update is completed the device reboots automatically ...

Page 10: ...ic Flow Remove foot rubber 2 Connect OTG cable to micro USB 3 OTG Cable Commercially available OTG cable to easily on the market can buy 4 Start update by USB after booting 3 PROGRAM UPDATE BY USB THROUGH MICRO USB JACK using OTG Cable USB ...

Page 11: ...SB port of the NP8350 by USB JIG OTG You can see rotation of all LED in updating If updating is finished all LED blink and off Rebooting NP8350 Music Flow 7 Other program update Update method is same with BE program Just change the update file name MICOM MICOM_NP8350 HEX MEQ MEQ_NP8350 HEX TOUCH TOUCH1_NP8350 DLD PEQ EQ_PRG BIN Notes You can find the upgrade status from LED status during software ...

Page 12: ...00 240 V 50 60 Hz Output 12 V 1 0 A Dimensions W x H x D 194 mm x 64 mm x 70 mm without foot Bluetooth Codec SBC Battery Battery capacity 2600 mAh Operating time is approx 4 hours Wi Fi Off Status 6 hours It may vary depending on the battery status and operational conditions Based on 26 volume 1kHz signal 400 mV portable input and fully charged status Net Weight Approx 0 8 kg Design and specificat...

Page 13: ...1 12 ...

Page 14: ...TIONS 2 2 1 HOW TO DISASSEMBLE THE GRILLE 2 2 2 HOW TO DISASSEMBLE THE FRONT COVER 2 4 3 HOW TO REPLACE THE BATTERY 2 6 ASSEMBLY INSTRUCTIONS 2 10 1 HOW TO ASSEMBLE THE GRILLE 2 10 EXPLODED VIEWS 2 15 1 CABINET AND MAIN CHASSIS 2 15 2 PACKING ACCESSORY SECTION 2 17 ...

Page 15: ...so as not to damage 2 Use a thin flat tool ex A flathead screwdriver recommended size within width 2 5 mm the Left end of the set to lift grille into the grille hole CAUTION Be careful not to damage the case 1 HOW TO DISASSEMBLE THE GRILLE 3 Repeat work twice top and bottom like Figure 1 1 ...

Page 16: ...2 3 Figure 1 3 4 Remove grille in the opposite direction after holding grille CAUTION Careful you don t cut when to remove the grill ...

Page 17: ...ront screw 10 EA using a philips screwdriver 2 HOW TO DISASSEMBLE THE FRONT COVER Figure 2 2 2 After remove rubber foot on the bottom remove screw of the four edges of bottom screw using a philips screwdriver Figure 2 1 ...

Page 18: ...2 5 Figure 2 4 Figure 2 3 4 Remove double sided Tape attached at cover front 3 Push inside to the battery hole and remove cover front ...

Page 19: ...gure 3 1 1 After remove foot on the bottom remove screw of bottom screw using a phillips screwdriver 3 HOW TO REPLACE THE BATTERY 2 Remove the Battery Assembly to release the hook using the driver Figure 3 2 ...

Page 20: ...2 7 Figure 3 3 Figure 3 4 3 Prepare new Battery Assembly 4 Make the wire straight and mount the wire on the wafer to use driver ...

Page 21: ...2 8 Figure 3 6 Figure 3 5 6 Check the wire arrangement between the passive radiator and battery supporter silk print on the PCB 5 Push the jack of the wire to hooking using driver ...

Page 22: ...2 9 Figure 3 7 7 Close the Battery Assembly fix the screw and assemble the rubber foot ...

Page 23: ... Figure 4 1 1 Set is placed on top of soft sheet so as not to damage CAUTION Before assemble grille remove double sided Tape attached at cover front surely 1 HOW TO ASSEMBLE THE GRILLE 2 Remove release paper of double sided Tape at grille ...

Page 24: ...2 11 Figure 4 3 Figure 4 4 3 Bend the position of 1 0 1 5 mm from outskirt line the of grille rib refer to guide line inwards 0 5 1 0 mm as in figure 4 Bend both short ribs as in figure 4 4 Guide Line ...

Page 25: ... jack rib and cover front right rib If it is damage bend grill rib refer to the figure 4 5 6 When viewed from the front of set match the Right of cover main and hole rib of grille and push lightly when viewed from the rear of set match hole rib of grille toward side button and push lightly ...

Page 26: ... 7 Figure 4 8 7 Prepare tool of strengthen material and soft sheet 8 Before you press the set tool is placed on top of soft sheet above of grille FLAT TOOL SOFT SHEET 1 SOFT SHEET 1 SOFT SOFT SHEET 2 SHEET 2 SET 1 2 ...

Page 27: ...2 14 1 2 1 Figure 4 9 Figure 4 10 9 Press using weight at outskirts of grille Red Line 10 Procedure Left Right of set White Line front of set Red Line finally press Left Right of set White Line one more ...

Page 28: ...9 457 BT B A52 CABLE4 254 254 457 A41 KEY A 457 A49 457 266 CABLE5 264 276 A43 515 I 265B H Wi Fi antenna 265A EXPLODED VIEWS 1 CABINET AND MAIN CHASSIS Please refer to Disassembly Instructions Guide when disassembled the Grille 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 29: ...2 PACKING ACCESSORY SECTION 826 Filter Ferrite core 801 Owner s manual 833 AC adapter 804 Bag Accessory box Inner box 803 Packing 803 Packing 802A 802B Box 802C ...

Page 30: ... MODE 3 10 5 AUDIO Wi Fi MODE 3 10 WAVEFORMS OF MAJOR CHECK POINT 3 11 1 MICOM 3 11 2 AMP 3 11 3 MPEG 3 12 4 BLUETOOTH 3 14 5 Wi Fi 3 14 WIRING DIAGRAM 3 15 BLOCK DIAGRAM 3 17 CIRCUIT DIAGRAMS 3 19 1 MAIN POWER CHARGER CIRCUIT DIAGRAM 3 19 2 MAIN MICOM AMP CIRCUIT DIAGRAM 3 21 3 MAIN MPEG CIRCUIT DIAGRAM 3 23 4 I O CIRCUIT DIAGRAM 3 25 5 KEY CIRCUIT DIAGRAM 3 27 CIRCUIT VOLTAGE CHART 3 29 PRINTED ...

Page 31: ...roblem occurs when you power on the unit 1 1 Solution Check and replace IC901 on main board 1 2 How to troubleshoot Countermeasure 1 Check 3 4 VA C916 C916 is not 3 4 VA replace IC901 2 Check X501 Crystal If it does not oscillate replace X501 Main board top view X501 X501 C916 C916 IC901 IC901 ...

Page 32: ... IC801 on main board 2 2 How to troubleshoot Countermeasure 1 Check solder of JK401 2 Check input voltage of IC801 L801 L802 L801 should be 3 3 V L502 should be 5 V 3 Check if signal enters pin13 and pin14 of IC801 Check if signal comes out from pin8 and pin9 of IC801 If it doesn t work replace IC801 Main board top view IO board top view IC801 IC801 JK401 JK401 ...

Page 33: ...heck and replace CN502 on main board 3 2 How to troubleshoot Countermeasure 1 Check if Bluetooth module is in pairing state with your device 2 Check connection of CN502 and Bluetooth module 3 Check input voltage of CN502 pin10 It should be 3 4 V 4 If voltage is 3 4 V replace Bluetooth module 5 If It is still out of order after this process replace main board assembly CN502 CN502 ...

Page 34: ...ution Check and replace CN501 on main board 4 2 How to troubleshoot Countermeasure 1 Check if Wi Fi is in connect state with your device 2 Check connection of CN501 and Wi Fi module 3 Check Input voltage of CN501 pin6 It should be 3 3 V 4 If voltage is 3 3 V replace Wi Fi module 5 If It is still out of order after this process replace main board assembly CN501 CN501 ...

Page 35: ...TERY Battery is not charged 5 1 Solution Check and replace IC902 on main board 5 2 How to troubleshoot Countermeasure 1 Check both end Voltage of R931 It should be 22 25 mV 2 Check pin2 3 of IC902 It should be 6 5 8 4 V 3 Check pin12 of IC902 It should be 3 3 V 4 It doesn t work replace IC902 IC902 IC902 ...

Page 36: ...to IC905 L900 Is the Vin 13 V supplied to IC905 L900 Check the IC903 Check the IC903 YES YES NO NO Around the IC905 parts OK RLC Around the IC905 parts OK RLC Replace the weird one Replace the weird one YES YES NO NO 1 POWER SUPPLY ON MAIN BOARD Replace the IC905 Replace the IC905 ...

Page 37: ...in 13 V supplied to IC901 L906 Is the Vin 3 4 VA supplied to IC900 Check the IC903 Check the IC901 YES YES NO NO Around the IC901 parts OK RLC Around the IC900 parts OK RLC Replace the weird one Replace the weird one YES YES NO NO Replace the IC901 Replace the IC900 ...

Page 38: ...300 5 V 3 3 V load Is the DC_V of IC103 pin48 3 4 VA Replace cable Check power Check power YES YES YES NO NO NO Check the IC300 pin9 pin15 signal Is the DC_V of IC103 pin40 3 3 V Check R130 R133 Replace IC300 YES YES YES NO NO NO 3 LED 2 MICOM OK OK Check power Replace R130 R133 ...

Page 39: ... IC801 3 3 V Check PWM signal IC700 pin1 4 33 36 Check audio signal CN700 Check UART signal CN502 pin4 6 Check 3 4 V CN502 pin10 Check power Replace IC700 IC801 Check L702 L703 L04 L705 and speaker cable connection Check mode Bluetooth Check mode Wi Fi OK Replace Bluetooth module Check power YES YES YES YES YES NO NO NO NO NO 4 AUDIO BLUETOOTH MODE 5 AUDIO Wi Fi MODE OK ...

Page 40: ...3 11 WAVEFORMS OF MAJOR CHECK POINT 1 MICOM 2 AMP MICOM_UART_TX MICOM_UART_RX SCLK LRCLK SDA Figure 2 MICOM to AMP I2S Figure 1 MICOM to MPEG 1 2 3 5 4 3 4 5 1 2 ...

Page 41: ...3 12 3 MPEG 1 2 Figure 3 1 IC501 MT8507 X TAL 27 MHz 6 Figure 3 3 IC501 MT8507 CLK 8 Figure 3 2 IC501 MT8507 WE 7 6 7 8 ...

Page 42: ...3 13 MPEG 2 2 Figure 3 4 IC501 MT8507 CAS 9 Figure 3 5 IC501 MT8507 BA0 10 9 10 ...

Page 43: ...3 14 4 BLUETOOTH 5 Wi Fi BT_TX BT_RX BT_RST WIFI_N WIFI_P Figure 4 Bluetooth signal Figure 5 14 WIFI_N 15 WIFI_P 13 12 11 15 14 11 12 13 14 15 ...

Page 44: ...m AG SMD Locking 20 P 0 5 mm AG SMD Locking CN 20 P 0 5 mm AG SMD Locking MCS ROM SPK R SPK L I O Wi Fi AUX IN 12 V DC IN FFC Harness CN 12P 0 5 mm AG SMD Locking KEY LED CN CN 12P 0 5 mm AG SMD Locking DC JACK 6 P 1 25 mm AG SMD SVC RESET ADD WIFI CN MAIN 3 16 3 15 WIRING DIAGRAM ...

Page 45: ...8507 PORTABLE ADC PCM1808 L R 3 3 V 5 V 1 2 V 3 3 V_Wi Fi FFC CON I2C SDA SCL I2C AMP_SD CON_A SW1 SW1 SW2 3 4VA 3 3 V S W BD2242 SW3 Battery 7 4 V 2600 mA UART 5 V SYS_PWR LDO LM37102 3 3 V_Wi Fi Wi Fi Module 2 x 2 Ext Ant FFC CON Wi Fi Setup ADD KEY1 Vol Vol Power Function FFC CON Play PWR On PWR Off Charge Wi Fi B T Portable KEY2 Charger BQ24133 SYS_PWR SW0 TPS40210 COIL 3 3 µH G S D N CH FET T...

Page 46: ...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 EAX66235101 Rev1 6 18 MAIN 1 2015 02 04 3 20 3 19 CIRCUIT DIAGRAMS 1 MAIN POWER CHARGER CIRCUIT DIAGRAM ...

Page 47: ...1 2 3 4 5 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 MICOM AMP EAX66235101 Rev1 6 18 MAIN 2 2015 02 04 3 22 3 21 2 MAIN MICOM AMP CIRCUIT DIAGRAM ...

Page 48: ...11 6 12 13 14 15 7 9 10 8 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 MPEG EAX66235101 Rev1 6 18 MAIN 3 2015 02 04 3 24 3 23 3 MAIN MPEG CIRCUIT DIAGRAM ...

Page 49: ...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 EAX66177601 Rev1 6 18 2015 02 04 3 26 3 25 4 I O CIRCUIT DIAGRAM ...

Page 50: ...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 EAX66193101 Rev1 6 18 2015 02 04 3 28 3 27 5 KEY CIRCUIT DIAGRAM ...

Page 51: ...FP R TP 48P Vender TEXAS INSTRUMENTS PVDD pin2 3 34 35 AVDD pin13 DVDD pin27 Spec PVDD 8 V 26 4 V DVDD AVDD 3 V 3 6 V Measure PVDD 13 V DVDD AVDD 3 3 V IC801 ADC PCM1808 Type TSSOP P TR 14P Vender TEXAS INSTRUMENTS Vdd pin4 Vcc pin3 Spec Vcc 4 5 V 5 5 V Spec Vdd 2 7 V 3 6 V Measure Vdd 3 3 Vcc 5 IC900 Swiching IC BD2242G Type SSOP6 Vender ROHM Vin pin1 Spec 2 8 V 5 5 V Measure Vin 3 4 IC901 DC DC ...

Page 52: ...3 32 3 31 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 53: ...3 34 3 33 2 I O P C BOARD DIAGRAM 3 KEY P C BOARD DIAGRAM TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

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