LG NP7550 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Speakers
  5. NP7550 Music flow P7
  6. Service manual

LG NP7550 Service Manual

Portable bluetooth speaker
Hide thumbs Also See for NP7550:
Table of Contents

Advertisement

Quick Links

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

Advertisement

Table of Contents
loading

Related Manuals for LG NP7550

Summary of Contents for LG NP7550

  • Page 1 Internal Use Only Website http://biz.lgservice.com Portable Bluetooth Speaker SERVICE MANUAL MODEL: NP7550 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN76872634 MARCH, 2015...
  • Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 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: Esd Precautions

    ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

  • Page 5: Hidden Key Mode

    HIDDEN KEY MODE Hidden Key Description Demo Wake UP “Bluetooth” + “Power” key for 5 seconds Factory Reset “Play/Pause” + “Power” key for 3 seconds APD Off, FOTA Admin Enable/ Disable “Volume Up” + “Power” key for 3 seconds Vibration Test Volume 19 Scan Enable “Bluetooth”...

  • Page 6: Program Update Guide

    PROGRAM UPDATE GUIDE 1. INSTALLING “Music Flow Bluetooth” APP 1) Download “Music Flow Bluetooth” 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. ...
  • Page 7 Step 1. Search and connect speaker Step 2. Select “setting” Step 4. Check new version fi rmware Step 3. Select “Device version info.” and press “OK”.
  • Page 8 Step 5. Select update button Step 6. Start downloading fi rmware Step 7. Download from CDN Server Step 8. Transfer FW * During update, do not off Bluetooth connection.
  • Page 9 Step 9. FW Flash Writing Step 10. Update is completed * During update, do not turn off the set. CAUTION: Transfer fi rmware from Phone to Set during upgrade, you can see rotating of white LED of the set. When upgrade is fi nished, all LED are blinks and off, and then Music Flow set is power off.

  • Page 10: Service Information For Eeprom

    SERVICE INFORMATION 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: Mcs / Eq Program Usb Update

    2. INSTALLATION OF MP APP AND VERSION CHECK 1) Install & Run “MP Version_BT App”. 2) Press and Hold “Power” + “Play/ Pause” Key for 3 seconds 3) After few seconds later, you can see “Connect Request” pop-up message from the mobile device. 4) Select “OK”...

  • Page 12: Program Upgrade Using Download Jig

    PROGRAM UPGRADE USING DOWNLOAD JIG 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. 1-11...
  • Page 13 2) See the back side of set. Remove rubber foot. 3) Loosen 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. 1-12...
  • Page 14 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 1-13...
  • Page 15 2. MCS PROGRAM (MCS CHIP) Download program fi le name : HG580_NP7550_xxxxxxx.bin If security program(Water Wall) is activated on PC, you must save the fi le to the USB storage device and disable the security software, then download the fi le to your set. CAUTION : When downloading the fi...

  • Page 16: Specifications

    SPECIFICATIONS Power Supply 2.0 A (AC Adapter) Built-in rechargeable battery Power consumption 10 W AC Adapter Model: WB-10A05FU Manufacturer: Yang Ming Industrial I nput: AC 100 - 240 V, 50/60 Hz Output: 5 V 2.0 A Dimensions (W x H x D) Approx.
  • Page 17 1-16...
  • Page 18 SECTION 2 CABINET & MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS ........................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.

  • Page 19: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. HOW TO DISASSEMBLE THE GRILLE 1) Set is placed on top of soft sheet so as not to damage. 2) Use a thin fl at tool (ex. A fl athead screwdriver, recommended size : within width 2.5 mm), the Left end of the set to lift grille into the grille hole.
  • Page 20 4) Remove grille in the opposite direction after holding grille. CAUTION : Careful you don’t cut when to remove the grille. Figure 1-3...

  • Page 21: How To Disassemble The

    2. HOW TO DISASSEMBLE THE FRONT COVER 1) Remove the front screw 8 EA using a philips screwdriver. Figure 2-1 2) After remove rubber foot on the bottom, remove screw of the four edges of bottom screw using a philips screwdriver.
  • Page 22 3) Push inside to the battery hole and remove cover front. Figure 2-3 4) Remove double - sided Tape attached at cover front. Figure 2-4...

  • Page 23: How To Replace The Battery

    3. HOW TO REPLACE THE BATTERY 1) After remove foot on the bottom, remove screw of the four edges of bottom screw using a phillips screwdriver. Figure 3-1 2) Remove the Battery Assembly to release the hook using the (-) driver. Figure 3-2...
  • Page 24 3) Prepare new Battery Assembly. Figure 3-3 4) Make the wire straight and mount the wire on the wafer to use (-) driver. Figure 3-4...
  • Page 25 5) Push the jack of the wire to hooking using (-) driver. Figure 3-5 6) Check the wire arrangement between the passive radiator and battery supporter silk print on the PCB. Figure 3-6...
  • Page 26 7) Close the Battery Assembly, fi x the screw and assemble the rubber foot. Figure 3-7...

  • Page 27: Assembly Instructions

    ASSEMBLY INSTRUCTIONS 1. HOW TO ASSEMBLE THE GRILLE 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. Figure 4-1 2) Remove release paper of double - sided Tape at grille. Figure 4-2 2-10...
  • Page 28 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 fi gure. Guide Line Figure 4-3 4) Bend both short ribs as in fi gure. Before After Figure 4-4 2-11...
  • Page 29 5) When viewed from the front of set, match the Right of cover rear and lengthy rib of grille and push lightly. Figure 4-5 6) Match the Left of cover rear and short two ribs of grille, and push lightly. Top of Grille (Wide) Bottom of Grille (Narrow) CAUTION : When assemble grille, be careful : Wide side is Top, Narrow side is Bottom.
  • Page 30 7) Prepare tool of strengthen material and soft sheet. SOFT SHEET 1 SOFT SHEET 2 FLAT TOOL Figure 4-7 8) Before you press the set, tool is placed on top of soft sheet above of grille. Figure 4-8 2-13...
  • Page 31 9) Press using weight at outskirts of grille. (Red Line) Figure 4-9 10) Procedure : Left, Right of set ① (White Line)  front of set ② (Red Line) fi nally press Left, Right of set ① (White Line) one more. Figure 4-10 2-14...

  • Page 32: Exploded Views

    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. CABLE1 CABLE4 CABLE2 MAIN mark replacement, grill two orders. (Loc No.

  • Page 33: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 801 Owner’s manual 820 USB Data cable 833 AC adapter 803 Packing 803 Packing 802A Accessory box 802C Box 802B Inner box...
  • Page 34 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................3-2 1. NO POWER PROBLEM ......................... 3-2 2. NO SOUND IN PORTABLE MODE ......................3-3 3. NO SOUND IN BLUETOOTH MODE ..................... 3-4 4. NO CHARGING BATTERY ........................3-5 ELECTRICAL TROUBLESHOOTING GUIDE ....................3-7 1.

  • Page 35: One Point Repair Guide

    ONE POINT REPAIR GUIDE 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).

  • Page 36: Sound In Portable Mode

    ONE POINT REPAIR GUIDE 2. NO SOUND IN PORTABLE MODE No sound problem occurs in portable mode. 2-1. Solution Check and replace IC500 on main board. 2-2. How to troubleshoot (Countermeasure) 1) Check solder of JK300. 2) Check input voltage of IC500 (L503, C504). ...

  • Page 37: Sound In Bluetooth Mode

    ONE POINT REPAIR GUIDE 3. NO SOUND IN BLUETOOTH MODE No power problem occurs when you power on the main set. 3-1. Solution 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.

  • Page 38: Charging Battery

    ONE POINT REPAIR GUIDE 4. NO CHARGING BATTERY 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.
  • Page 39 ONE POINT REPAIR GUIDE NO CHARGING BATTERY Battery 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.) ...

  • Page 40: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER/DSP/AMP Power/DSP Check connection Connect CN901. of CN901. Is voltage of the battery above 6.5 V? Charge the battery. (CN901) Is voltage Replace IC902. of IC902 3.4 V? Is the input voltage Replace L501. 3.4 VA? (L501) Is the input voltage Replace L509.

  • Page 41: Charging Battery

    ELECTRICAL TROUBLESHOOTING GUIDE 2. CHARGING BATTERY Charging battery. Red LED of Charging. power key blink? Check the connection Connect adapter cable. of adapter cable. Check connection Does 9.6 V enter IC906 Connect CN900, CN301. of CN900 and CN301. (Check pin2, 3)? Replace IC300.

  • Page 42: Amp

    ELECTRICAL TROUBLESHOOTING GUIDE 3. AMP Set turns on but there is no sound. Check connection Connect CN700. of CN700. Does 13 V flow IC700? Check power. Replace IC902. (Check pin2,3,34,35) Check 3.3 V. Check output power. Check switching signal. (Pin2 of IC902) (Pin5 of IC901) (L701) Replace L701.

  • Page 43: Pairing Bluetooth

    ELECTRICAL TROUBLESHOOTING GUIDE 4. PAIRING BLUETOOTH Pairing Bluetooth. Check the connection of FFC. Connect FFC. Is voltage of L500 3.4 V? Check power. Is BT_RST HIGH? Check DSP. (R504) Replace Bluetooth module. Check DSP. If it still doesn’t work 5. KEY/ LED Key, LED Is input voltage 3.4 VA? Check power.

  • Page 44: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. DSP 2. ADC 3.4 VA Crystal 24 MHz 1.2 VA Reset Figure 1. DSP Power Sequence Figure 2. DSP TO ADC I2S 1) L501 : 3.4 VA, 2) L509 : 1.2 VA, 3) R558 : RESET, 4) R529 : Crystal 24 MHz IC501 IC501...
  • Page 45 3. BLUETOOTH 4. AMP Figure 3. Bluetooth I2C Figure 4. AMP I2C 8) BT_SCL, 9) BT_SDA 10) AMP_SDA, 11) AMP_SCL 3-12...

  • Page 46: Wiring Diagram

    WIRING DIAGRAM Battery CSR8811 5 P, 2.00 mm 10 P, 1 mm ST, Locking, SMD AG, SMD, Locking DC IN 20 P, 0.5 mm 20 P, 0.5 mm AG, SMD Locking AG, SMD Locking AUX IN IO (Portable 4 P, 2.00 mm /DC JACK) CN700 ST, Locking, SMD...

  • Page 47: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM 10 W 5 V 2 A Battery 9.6 V 8.4 V DCDC Boost Charger TPS61175 7.4 V 2600 mA BQ24133 6~8.4 V mUSB LM37102 LDO AP7335 2.5~16 V 1 A PVDD 2~6 V 0.3 A AP7335 3.3 V MBRD10...

  • Page 48: Power Block Diagram

    2. POWER BLOCK DIAGRAM DCDC Boost Charger +9.6 V, 0.9 A, 8.6 W +8.4 V 0.89 A, 7.5 W 15 mΩ BAT_+8.4 VA, 0.85 A, 7.14 W Battery (19.24 W) mUSB TPS61175 BQ24133 7.4 V 2600 mAh 30 mΩ (90 %) (95 %) +5 V, 2 A, +9.6 V, 0.93 A, 9 W...

  • Page 49: Circuit Diagrams

    CIRCUIT DIAGRAMS 1. MAIN - DSP/ ADC/ AMP CIRCUIT DIAGRAM DSP/ ADC/ AMP : WAVEFORM NUMBER EAX66063201_Rev1.7(27)_SD1 2015.01.23 3-19 3-20...

  • Page 50: Main - Power/ Charger Circuit Diagram

    2. MAIN - POWER/ CHARGER CIRCUIT DIAGRAM CAUTION: DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY REPLACED. REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE. POWER/ CHARGER EAX66063201_Rev1.7(27)_SD2 2015.01.23 3-21 3-22...

  • Page 51: Jack Circuit Diagram

    3. JACK CIRCUIT DIAGRAM JACK EAX66064301_Rev1.7(27)_SD 2015.01.23 3-23 3-24...

  • Page 52: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART IC Sym IC Name/Type Input Voltage IC Sym IC Name/Type Input Voltage TPS61175 AP7335-WG-7-82 • Spec : 2.9 V ~ 18 V • Spec : 2 V ~ 6 V IC300 Type : HTSSOP R/TP 14P IC905 Type : SOT-25 R/TP •...

  • Page 53: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3-27 3-28...

  • Page 54: Jack P. C. Board

    2. JACK P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3-29 3-30...
  • Page 55 3-31 3-32...

This manual is also suitable for:

Np7550b0

Table of Contents