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LG NP7550 Music flow P7, Service Manual

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LG NP7550 Music flow P7 Service Manual Download Page 35

 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 main set.

1-1. Solution

Check and replace IC902 on main board.

1-2. How to troubleshoot (Countermeasure)

1) Check 3.4 VA (L501). 



 L501 is not 3.4 VA, replace IC902. 

2) Check X501 (Crystal). 



 If it does not oscillate, replace X501.

< Main board bottom view >

L501

L501

IC902

IC902

< Main board top view >

X501

X501

Summary of Contents for NP7550 Music flow P7

Page 1: ...RVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only Website http biz lgservice com Portable Bluetooth Speaker MARCH 2015 P NO AFN76872634 MODEL NP7550 MODEL NP7550 ...

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

Page 3: ...N 1 GENERAL CONTENTS ESD PRECAUTIONS 1 3 HIDDEN KEY MODE 1 4 PROGRAM UPDATE GUIDE 1 5 SERVICE INFORMATION FOR EEPROM 1 9 MCS EQ PROGRAM USB UPDATE 1 10 PROGRAM UPGRADE USING DOWNLOAD JIG 1 11 SPECIFICATIONS 1 15 ...

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: ...ration Test Volume 19 Volume Up Power key for 3 seconds Scan Enable Bluetooth key for 2 seconds Bluetooth all Disconnect Paired List Clear Bluetooth key for 10 seconds Dual Play Master Bluetooth Volume Up key for 2 seconds Dual Play Slave Bluetooth Volume Down key for 2 seconds Sound Sync Bluetooth Play Pause key for 2 seconds Volume UP Play Pause Bluetooth Power Volume DOWN ...

Page 6: ...on the Apps Store or Google Play Store 2 PROGRAM UPDATE BY Music Flow Bluetooth APP 1 After power on Press and Hold Power Volume Up Key for 3 seconds PROGRAM UPDATE GUIDE Beep sound is output and all white LED blink once 2 Run Music Flow Bluetooth APP ex Android Bluetooth APP ...

Page 7: ...1 6 Step 1 Search and connect speaker Step 2 Select setting Step 3 Select Device version info Step 4 Check new version firmware and press OK ...

Page 8: ...1 7 Step 5 Select update button Step 6 Start downloading firmware Step 7 Download from CDN Server During update do not off Bluetooth connection Step 8 Transfer FW ...

Page 9: ...do not turn off the set Step 10 Update is completed CAUTION Transfer firmware from Phone to Set during upgrade you can see rotating of white LED of the set When upgrade is finished all LED are blinks and off and then Music Flow set is power off ...

Page 10: ...TION FOR EEPROM 1 PHONE SETTINGS 1 Enable Bluetooth of the mobile device 2 Change name of mobile device in BLUETOOTH SETTNG MENU 3 Enable discoverable mode of mobile device 4 And setting the discoverable time to unlimited ...

Page 11: ... the file to the USB storage device and disable the security software then download the file to your set CAUTION When downloading the file you should neither unplug the USB device change to the other function nor power off the device USB device must be unplugged when the downloading process is completed How to update MCS program 1 Fast format USB stick 2 Copy Firmware file to USB stick 3 Insert US...

Page 12: ...11 1 CONNECTION OF THE JIG Caution Jig cable is same with SoundPlate LAP340 1 Insert the Jig cable in CN904 CAUTION Be careful of the direction of cable PROGRAM UPGRADE USING DOWNLOAD JIG KURNC KI KI CDNG ...

Page 13: ...the screws on the four points 4 Open the Battery Assembly 5 Please insert of another side of Jig cable at CN503 of main board CAUTION Be careful of the direction of cable 2 See the back side of set Remove rubber foot ...

Page 14: ...1 13 6 Power on set Click Info key of home audio Remoto Control during 3 seconds Check Jig display USB 1 second No USB 7 Insert USB check Jig Display Firm W UP off ...

Page 15: ...conds 5 You can see rotation of all LED in updating 6 If updating is finished all LED blink and off 7 Power off 3 EQ PROGRAM Download program file name EQ_PRG_xxxxxxx bin If security program Water Wall is activated on PC you must save the file to the USB storage device and disable the security software then download the file to your set CAUTION When downloading the file you should neither unplug t...

Page 16: ...ry Communication Bluetooth Amplifier 10 W 10 W 4 Ω at 1 kHz THD 10 Speaker Type Built in Impedance Rate 4 Ω Rated Input Power 10 W Max Input Power 20 W Battery Battery capacity 2600 mAh Operating time is approx 8 hours Based on 30 volume 1 kHz signal 400 mV portable input and fully charged status It may vary depending on the battery status and operational conditions Design and specifications are s...

Page 17: ...1 16 ...

Page 18: ...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 19: ...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 20: ...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 grille ...

Page 21: ...Remove the front screw 8 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 ...

Page 22: ...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 23: ...1 After remove foot on the bottom remove screw of the four edges 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 24: ...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 25: ...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 26: ...2 9 Figure 3 7 7 Close the Battery Assembly fix the screw and assemble the rubber foot ...

Page 27: ... 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 28: ... 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 Guide Line Before After ...

Page 29: ...4 6 5 When viewed from the front of set match the Right of cover rear and lengthy rib of grille and push lightly 6 Match the Left of cover rear and short two ribs of grille and push lightly CAUTION When assemble grille be careful Wide side is Top Narrow side is Bottom ...

Page 30: ...2 13 Figure 4 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 2 SET 1 2 ...

Page 31: ...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 32: ... A44 515 BT B A52 CABLE4 515 252 259 EXPLODED VIEWS 1 CABINET AND MAIN FRAME SECTION The mark replacement grill two orders Loc No 250 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 33: ...803 Packing 803 Packing 820 USB Data cable 801 Owner s manual 833 AC adapter 802A Accessory box 802B Inner box 802C Box 3 PACKING ACCESSORY SECTION ...

Page 34: ...3 9 4 PAIRING BLUETOOTH 3 10 5 KEY LED 3 10 WAVEFORMS OF MAJOR CHECK POINT 3 11 1 DSP 3 11 2 ADC 3 11 3 BLUETOOTH 3 12 4 AMP 3 12 WIRING DIAGRAM 3 13 BLOCK DIAGRAMS 3 15 1 SYSTEM BLOCK DIAGRAM 3 15 2 POWER BLOCK DIAGRAM 3 17 CIRCUIT DIAGRAMS 3 19 1 MAIN DSP ADC AMP CIRCUIT DIAGRAM 3 19 2 MAIN POWER CHARGER CIRCUIT DIAGRAM 3 21 3 JACK CIRCUIT DIAGRAM 3 23 CIRCUIT VOLTAGE CHART 3 25 PRINTED CIRCUIT ...

Page 35: ...when you power on the main set 1 1 Solution Check and replace IC902 on main board 1 2 How to troubleshoot Countermeasure 1 Check 3 4 VA L501 L501 is not 3 4 VA replace IC902 2 Check X501 Crystal If it does not oscillate replace X501 Main board bottom view L501 L501 IC902 IC902 Main board top view X501 X501 ...

Page 36: ...C500 on main board 2 2 How to troubleshoot Countermeasure 1 Check solder of JK300 2 Check input voltage of IC500 L503 C504 L503 should be 3 3 V L504 should be 5 V 3 Check if signal enters pin13 and pin14 of IC500 Check if signal comes out from pin8 and pin9 of IC500 If it doesn t work replace IC500 Main board bottom view Jack board top view IC500 IC500 JK300 JK300 ...

Page 37: ... Check 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 38: ... Battery is not charged 4 1 1 Solution Check and replace IC906 on main board 4 1 2 How to troubleshoot Countermeasure 1 Check both end voltage of R931 It should be 22 25 mV 2 Check pin2 and pin3 of IC906 It should be 9 6 V 3 Check pin2 of IC906 It should be 3 3 V 4 It doesn t work replace IC906 IC906 IC906 ...

Page 39: ... is not charged 4 2 1 Solution Check and replace IC300 on jack board 4 2 2 How to troubleshoot Countermeasure 1 Check connection of CN301 and CN900 2 Check voltage of CN301 pin11 pin14 and CN900 pin7 pin10 It should be 9 6 V If voltage is not 9 6 V replace IC300 Jack board top view IC300 IC300 ...

Page 40: ...01 Is the input voltage 1 2 VA L509 Is voltage of IC902 3 4 V Is the input voltage 3 4 VA L501 Is voltage of the battery above 6 5 V CN901 NO NO NO NO NO YES YES YES YES YES Power AMP Connect CN901 Replace IC907 OK Charge the battery Check connection of CN901 Does 13 V flow IC700 Check pin2 3 34 35 Is voltage of the battery above 6 5 V CN901 NO NO NO YES YES YES ...

Page 41: ...nect adapter cable Does 9 6 V come out CN301 pin11 12 13 Replace IC902 Does 9 6 V enter IC906 Check pin2 3 IC906 is HIGH Check pin9 Red LED of power key blink Check the connection of adapter cable NO YES YES NO NO NO If it still doesn t work NO Check connection of CN900 and CN301 Does 5 V come out CN300 pin1 Check connection of CN901 YES NO YES NO YES YES YES NO ...

Page 42: ...ce IC501 Replace main board assembly Replace L701 Replace IC700 Replace IC901 Check 3 3 V L701 Is PDN signal LOW Pin19 of IC700 Check connection of CN700 Check I2C of IC700 R714 R715 Does 13 V flow IC700 Check pin2 3 34 35 Check I2S of IC700 Pin20 21 22 Is AMP_RST HIGH state R719 NO NO NO NO NO NO NO NO NO Check output power Pin5 of IC901 Check IC501 output R528 Check switching signal Pin2 of IC90...

Page 43: ...heck power Check DSP Check DSP Replace Bluetooth module Check power Check DSP Replace IC501 Check the connection of FFC Is input voltage 3 4 VA L501 Is BT_RST HIGH R504 Is voltage of L500 3 4 V Is control HIGH KEY R542 515 524 535 LED Pin3 of Q500 507 NO NO NO NO NO YES YES YES YES YES If it still doesn t work ...

Page 44: ...MAJOR CHECK POINT 1 DSP 2 ADC 3 4 VA 1 2 VA Reset Crystal 24 MHz Figure 1 DSP Power Sequence 1 L501 3 4 VA 2 L509 1 2 VA 3 R558 RESET 4 R529 Crystal 24 MHz Figure 2 DSP TO ADC I2S 2 4 3 1 5 6 7 5 7 6 1 3 4 2 IC501 IC501 ...

Page 45: ...3 12 3 BLUETOOTH 4 AMP Figure 3 Bluetooth I2C 8 BT_SCL 9 BT_SDA Figure 4 AMP I2C 10 AMP_SDA 11 AMP_SCL 9 8 11 10 8 9 11 10 ...

Page 46: ...able DC JACK AUX IN 5 V DC IN 4 P 2 00 mm ST Locking SMD CN700 Battery CN901 5 P 2 00 mm ST Locking SMD CN502 CN301 20 P 0 5 mm AG SMD Locking FFC Harness CSR8811 SPK L SPK R KEY LED 10 P 1 mm AG SMD Locking RESET KEY 3 14 3 13 WIRING DIAGRAM ...

Page 47: ...D 3 3 VA Key x5 LED x9 SD I2S DATA Charger BQ24133 Battery 7 4 V 2600 mA LDO LM37102 2 5 16 V 1 A MBRD10 N CH FET TPCA8A11 D G S TPS40210 COIL 3 3 uH DCDC Boost TPS61175 10 W 5 V 2 A AP7335 9 6 V 8 4 V 6 8 4 V 3 3 V 1 2 VA 1 2 V 3 3 V_BT 3 3 VS LDO AP7335 2 6 V 0 3 A PVDD 5 V Power control x3 3 4 VA 3 4 VA PWAKEUP PWR_CTRL BTPWR_CTRL PVDD Boost Block MCS CS8811 3 3 VA_BT For Jig CS1 CS2 AP7335x2 D...

Page 48: ... 3 3 V_BT 50 mA Boost Controller DCDC Buck TPS563200 4 5 17 V 3 A 95 LDO AP7335 LDO AP7335 LDO AP7335 LDO AP7335x2 LDO AP7335 LDO LM37102 N CH FET TPCA8A11 3 3 VS 50 mA 3 3 VS 10 mA Input Current Max Set 0 9 A 8 6 W mUSB 9 6 V 0 93 A 9 W 5 V 2 A 10 W BAT_ 8 4 VA 0 85 A 7 14 W 8 4 V 0 89 A 7 5 W 6 8 4 V 9 6 V 0 9 A 8 6 W 15 mΩ 13 V 113 mA 1 47 W Charger BQ24133 95 13 V 192 mA 2 5 W 1 47 W 30 mΩ DCD...

Page 49: ... 10 8 9 3 4 1 2 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 DSP ADC AMP EAX66063201_Rev1 7 27 _SD1 2015 01 23 3 20 3 19 CIRCUIT DIAGRAMS 1 MAIN DSP ADC AMP CIRCUIT DIAGRAM ...

Page 50: ... F G H I J K L M N O P Q R S T POWER CHARGER EAX66063201_Rev1 7 27 _SD2 2015 01 23 3 22 3 21 2 MAIN POWER CHARGER CIRCUIT DIAGRAM CAUTION DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY REPLACED REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE ...

Page 51: ...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 JACK EAX66064301_Rev1 7 27 _SD 2015 01 23 3 24 3 23 3 JACK CIRCUIT DIAGRAM ...

Page 52: ...VDD 27 pin Spec PVDD 8 V 26 4 V DVDD AVDD 3 V 3 6 V Measure PVDD 13 V DVDD AVDD 3 3 V IC900 LDO Voltage Regulator AP7335 WG 7 82 Type SOT 25 R TP Vender DIODES INCORPORATED Vin 1 Pin Spec 2 V 6 V Measure Vin 3 4 IC901 LDO Voltage Regulator AP7335 WG 7 82 Type SOT 25 R TP Vender DIODES INCORPORATED Vin 1 Pin Spec 2 V 6 V Measure Vin 3 4 IC902 DC DC Converter TPS563200 Type SOT 23 R TP 6P Vender TEX...

Page 53: ...3 28 3 27 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 54: ...3 30 3 29 2 JACK P C BOARD TOP VIEW BOTTOM VIEW ...

Page 55: ...3 32 3 31 ...

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