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LG NP8540 MusicFlow H5, Service Manual

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LG NP8540 MusicFlow H5 Service Manual Download Page 44

3-21

ELECTRICAL TROUBLESHOOTING GUIDE

①

Is the Vcc of IC102 

5.2 V? (Pin3)

Check Audio L/R signal 

(L101, L102).

Is the Vdd of IC102 

3.3 V? (Pin4)

Check ADC I2S signal

(IC102 Pin6, 7, 8, 9).

Check power circuit troubleshooting.

Check the device output or cable connection.

Check power circuit troubleshooting.

Check the IC504 and IC105, replace it.

YES

YES

YES

YES

YES

NO

NO

NO

NO

4-2. AUDIO (PORTABLE MODE)

OK

Summary of Contents for NP8540 MusicFlow H5

Page 1: ... Audio SERVICE MANUAL MODEL NP8540 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL NP8540 SERVICE MANUAL P NO AFN76793356 SEPTEMBER 2014 Website http biz lgservice com Internal Use Only ...

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

Page 3: ...ERVICING GUIDELINES FOR AUDIO PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES SOFTWARE UPDATE GUIDE 1 5 HIDDEN MODE 1 11 VERSION CHECK 1 12 SPECIFICATIONS 1 13 ...

Page 4: ...rized 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 necessary 5 No lead or component should touch a...

Page 5: ...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 semiconductor chip components The following tech...

Page 6: ...1 5 SOFTWARE UPDATE GUIDE 1 Using MP tool 1 Open MP tool and select Key DN 2 Check the section for download and open download file ...

Page 7: ...192 168 0 1 4 Set power on 5 Connect LAN cable to Set and then Press ADD key within 3sec after connect the LAN Please connect the LAN when blinking WiFi LED after booting Download file name BE LG_NS9000M06 ROM MICOM MICOM_NP8540 HEX 6 Connect Status change OK if success connect MP tool ...

Page 8: ...1 7 7 Press Update button 8 Download result display OK if start download ...

Page 9: ...1 8 9 You can identify update status by network indicator lamp Updating blinking red LED Complete update blinking white LED ...

Page 10: ...1 9 2 Using APP 1 Connect set and music flow app 2 Select setup Æ update menu then you can see below menu 3 Enter Check button then display speaker list for update download ...

Page 11: ...1 10 4 Enter download button then start download to speaker 5 Display below menu after done download then enter Ready button for updating download Downloading Ready Downloaded ...

Page 12: ...11 6 Display below menu after done update 7 Set rebooting Booting previous version if failed update Updated HIDDEN MODE Reset Press ADD button for 8 seconds Micom reset Remote control play WIFI SETUP key ...

Page 13: ...nd SET by cross LAN cable Setting PC IP 192 168 0 1 255 255 255 0 192 168 0 1 3 Set power on 4 Connect LAN cable to Set and then Press ADD key within 3sec after connect the LAN Please connect the LAN when blinking WiFi LED after booting 5 Display the version in the tool ...

Page 14: ...ure 5 C to 35 C Operating humidity 5 to 90 INPUTS PORTABLE IN 400 mVrms 3 5 mm stereo jack AMPLIFIER Stereo mode 20 W 20 W 6 Ω at 1 kHz T H D 10 SPEAKERS Type Built in Impedance Rated 6 Ω Rated Input Power 20 W Max Input Power 40 W SYSTEM ETHERNET LAN port Ethernet jack x 1 10 BASE T 100 BASE TX Wireless LAN internal antenna Integrated IEEE 802 11n Draft 2 0 wireless networking access compatible w...

Page 15: ...1 14 ...

Page 16: ...2 1 SECTION 2 CABINET MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS 2 2 EXPLODED VIEWS 2 7 1 CABINET AND MAIN FRAME SECTION 2 7 2 PACKING ACCESSORY SECTION 2 9 ...

Page 17: ... 2 1 Remove the Cover Rear Assembly Work on soft sheet DISASSEMBLY INSTRUCTIONS Using Flat blade tool put one of both side hole Place beneath a thick soft sheet Lift tool using the principle of leverage ...

Page 18: ...2 3 2 Remove the Case Rear Assembly Screws NP8540 15EA NP8740 17EA 3 Pull Out Cable Bluetooth Cable Volume PCB Cable WIFI Cable Speaker Cable Push down the rubber Exist only NP8740 ...

Page 19: ...2 4 4 Remove the Case Rear Assembly Chassis PCB Assembly 5 Remove the Knob Volume Using small and long tool Put the Holder PCB volume hole ...

Page 20: ...2 5 6 Remove the Screws 3EA of Case Main Assembly Top And Pull Out PCB Volume Assembly Holder PCB Volume 7 Pull Out PCB LED Assembly After Push the Guide hook Pull out PCB LED Assembly ...

Page 21: ...2 6 8 Pull Out Wi Fi Module at Case Rear Assembly 9 Remove the Unit Tweeter Screws 12EA After Push the Guide hook pull out Wi Fi Module ...

Page 22: ...ND MAIN FRAME SECTION NFC C D G G E B F A B H I F C A E H I D 452 464 250 A45 251 A43 252 A52 A54 A42 261 263 264 A46 266 265 260 253 A41 452 452 254 464 262 464 464 255 CABLE4 CABLE1 CABLE2 CABLE3 CABLE5 VOLUME LED BT WiFi MAIN ...

Page 23: ...2 PACKING ACCESSORY SECTION 801 Owner s manual 804 Bag 803 Packing 802 Box 830 Adapter 300 Power Cord 803 Packing ...

Page 24: ...3 14 2 MICOM 3 17 3 LED 3 18 4 AUDIO 3 19 WAVEFORMS OF MAJOR CHECK POINT 3 22 1 MICOM 3 22 2 AMP 3 22 3 MPEG 3 23 4 BLUETOOTH 3 25 5 Wi Fi 3 25 WIRING DIAGRAM 3 27 BLOCK DIAGRAM 3 29 CIRCUIT DIAGRAMS 3 31 1 MAIN MICOM ADC AMP CIRCUIT DIAGRAM 3 31 2 MAIN MPEG CIRCUIT DIAGRAM 3 33 3 MAIN MEMORY HW TRAP CIRCUIT DIAGRAM 3 35 4 VOLUME CIRCUIT DIAGRAM 3 37 5 LED CIRCUIT DIAGRAM 3 39 CIRCUIT VOLTAGE CHAR...

Page 25: ...03 on main board 1 1 2 How to troubleshoot Countermeasure 1 Please Check 18 VA of IC903 Pin2 IN 2 If 18 VA is abnormal check the parts JK900 F900 C905 D901 L902 C917 C922 C919 And then change the weird one 3 If 18 VA is OK but 5 2 VA is abnormal at the L906 replace IC903 1 1 3 Service hint Any picture Remark Main board top view IC903 IC903 ...

Page 26: ...oubleshoot Countermeasure 1 Please check 5 2 VA of IC904 Pin3 INPUT 2 If 5 2 VA is abnormal follow the stage 1 1 at the previous page 3 If 5 2 VA is OK but 3 6 VA is abnormal at the IC904 VOUT Pin4 replace IC904 4 When you followed above step but It doesn t work check the around parts R927 R928 L907 1 2 3 Service hint Any picture Remark Main board top view IC904 IC904 ...

Page 27: ... 3 3 V DVDD of L903 2 If 18 VA is abnormal follow the stage 1 1 at the previous page 3 If 3 3 V is abnormal follow the stage 3 2 at the next page 4 If 18 VA 3 3 V are OK but no sound from the speaker replace IC700 5 When you followed above step but it doesn t work check the around parts RLC 2 1 3 Service hint Any picture Remark Main board top view ONE POINT REPAIR GUIDE IC700 IC700 ...

Page 28: ...around parts R911 R912 R916 R919 R920 R921 L904 L909 C911 C915 C918 C923 C927 C928 C935 C940 C945 C948 and if there s no defective component replace IC902 If the PWR_CTRL1 level is Low follow the stage 3 3 4 If 5 2 VA is OK but 1 2 VA is abnormal at the IC902 Pin9 Pin10 check the PWR_CTRL0 s level If level ishigh checkthe around parts R909 R910 R915 R922 R924 R923 L905 L910 C910 C912 C914 C916 C92...

Page 29: ... VA of IC900 Pin2 VIN 2 If 18 VA is abnormal follow the stage 1 1 2 at the previous page 3 If 18 VA is OK but 3 3 V is abnormal at the IC900 Pin7 replace IC900 4 When you followed above step but it doesn t work check the around parts L900 C901 C904 C955 C956 C957 R941 R906 R929 C934 R930 R934 R938 R939 C920 C954 C925 3 2 3 Service hint Any picture Remark Main board top view IC900 IC900 ...

Page 30: ...n48 VIN 2 If 3 3 VA is abnormal follow the stage 3 2 at the previous page 3 If 3 3 VA of IC103 Pin48 VIN is OK check the EEP_CLK Pin1 EEP_DAT Pin2 signal If signal is abnormal change the IC103 4 If the EEP_CLK Pin1 EEP_DAT Pin2 signals are OK check the IC100 Pin8 VCC 3 3 VA If Pin8 VCC 3 3 VA is OK change the IC100 3 3 3 Service hint Any picture Remark Main board top view IC103 IC103 IC100 IC100 ...

Page 31: ... status of IC501 on your eyes 2 Check 1 2 V of L910 If 1 2 V is abnormal follow the stage 3 1 2 at the previous page 3 Check 1 5 V of L909 If 1 5 V is abnormal follow the stage 3 1 2 at the previous page 4 Check 3 3 V of L911 If 3 3 V is abnormal follow the stage 3 2 at the previous page 5 When you followed above step but it doesn t work replace the IC501 3 4 3 Service hint Any picture Remark IC50...

Page 32: ...e 2 Check 0 75 V of DDR3_VREF Point 2 If voltage is abnormal follow the stage 3 1 2 at the previous page 3 Check 1 5 V of C5A5 4 If 1 5 V and 0 75 V are abnormal check the around parts C5A5 C5A6 R555 R556 5 If there s no defective component follow the stage 3 1 2 at the previous page 6 When you followed above step but it doesn t work replace the IC503 IC504 3 5 3 Service hint Any picture Remark Ma...

Page 33: ...tion Replace IC505 on main board 3 6 2 How to troubleshoot Countermeasure 1 Check 3 3 V of R512 R511 C5B1 2 If 3 3 V is abnormal follow the stage 3 2 2 at the previous page 3 When you followed above step but it doesn t work replace the IC505 3 6 3 Service hint Any picture Remark Main board top view IC505 IC505 ...

Page 34: ...on Replace X501 on main board 3 7 2 How to troubleshoot Countermeasure 1 Check the frequency of 27 MHz crystal X501 2 If 3 3 V is abnormal follow the stage 3 2 2 at the previous page 3 If the crystal doesn t oscillate replace X501 3 7 3 Service hint Any picture Remark Main board top view X501 X501 ...

Page 35: ...ce JK500 on main board 4 1 2 How to troubleshoot Countermeasure 1 If there is soldering problem please re soldering pin JK500 2 If after re soldering problem still occurs replace JK500 3 If problem still occurs after change JK500 check MT8506 IC IC501 Refer to the stage 3 2 2 at the previous page 4 1 3 Service hint Any picture Remark Main board top view JK500 JK500 ...

Page 36: ...f IC102 Pin4 If 3 3 V_S is abnormal follow the stage 3 2 3 If 5 2 VA and 3 3 V_S are OK check the PTB_DET is HIGH state when potable cable connected L100 If it s LOW follow the stage 3 4 Micom 4 When you followed above step but It doesn t work Check the around parts Resistor Capacitor Bead If still not working replace the IC102 5 1 3 Service hint Any picture Remark Main board top view 5 2 VA 5 2 V...

Page 37: ...al Replace F900 same fuse Replace D901 Replace C908 917 922 919 Check JK900 and replace it YES YES YES YES NO NO NO 1 POWER SUPPLY ON MAIN BOARD No 5 2 VA Is the Vcc of IC903 18 VA Is the L906 of IC903 5 2 VA Around the parts OK RLC Check the 18 V Replace the weird one Replace IC903 OK YES YES YES YES NO NO NO ...

Page 38: ...plied to IC902 L903 Around the IC902 parts OK RLC Around the IC902 parts OK RLC Check the IC903 Check the IC903 Replace the weird one Replace the weird one Replace the IC902 Replace the IC902 YES YES YES YES YES YES NO NO NO NO ELECTRICAL TROUBLESHOOTING GUIDE POWER SUPPLY ON MAIN BOARD ...

Page 39: ...heck the 18 V Replace the weird one Replace the IC900 YES YES YES NO NO ELECTRICAL TROUBLESHOOTING GUIDE No 3 6 VA Is the Vin 5 2 VA supplied to IC904 L907 Around the IC904 parts OK RLC Check the IC903 Replace the weird one Replace the IC904 YES YES YES NO NO POWER SUPPLY ON MAIN BOARD ...

Page 40: ...OOTING GUIDE 2 MICOM MICOM OK Is the DC_V of IC103 Pin48 3 3 VA Is the DC_V of IC103 Pin40 3 3 V Check R129 R164 Check power circuit troubleshooting Replace R129 R164 Check power circuit troubleshooting YES YES YES YES NO NO NO ...

Page 41: ...esn t blinking Cable connection is OK CN101 400 300 301 3 6 V load on L106 Check the IC103 Pin15 16 17 18 signal Connect the cable correctly or replace it Check power circuit troubleshooting Replace IC103 Replace LD400 401 404 YES YES YES YES NO NO NO ...

Page 42: ...3 Is the Vdd of IC700 3 3 V Pin30 Check power circuit troubleshooting Check power circuit troubleshooting YES YES YES YES NO NO Check AMP I2S signal IC700 Pin23 24 25 Check PWM signal IC700 Pin2 4 45 47 Check Audio signal CN700 Replace IC700 Replace IC700 Check L701 L702 and speaker cable connection YES YES YES NO NO NO OK ...

Page 43: ...ESHOOTING GUIDE Check 3 3 V CN501 Pin1 Check UART signal CN500 Pin3 4 5 7 Check power circuit troubleshooting Check the IC504 and B T module replace it Replace the Bluetooth module YES YES YES NO NO 4 1 AUDIO BLUETOOTH MODE ...

Page 44: ...l L101 L102 Is the Vdd of IC102 3 3 V Pin4 Check ADC I2S signal IC102 Pin6 7 8 9 Check power circuit troubleshooting Check the device output or cable connection Check power circuit troubleshooting Check the IC504 and IC105 replace it YES YES YES YES YES NO NO NO NO 4 2 AUDIO PORTABLE MODE OK ...

Page 45: ...3 22 WAVEFORMS OF MAJOR CHECK POINT 1 MICOM 2 AMP MICOM to MPEG IC103 PIN 34 35 MICOM to AMP I2S IC700 PIN 23 24 25 tpjvt hy tpjvt hy y ijsr syjsr kh h 1 2 4 3 5 1 2 4 5 3 ...

Page 46: ...3 23 3 MPEG IC501 MT8506 XTAL 27 MHz 6 IC501 MT8506 WE IC501 MT8506 CLK 7 8 6 7 8 ...

Page 47: ...3 24 MPEG IC501 MT8506 CAS 9 IC501 MT8506 BA0 10 9 10 ...

Page 48: ...3 25 4 BLUETOOTH 5 Wi Fi BT_TX BT_RX BT_RT WIFI_N WIFI_P i i y i yz pmp u pmp w 12 11 13 14 15 13 11 12 15 14 ...

Page 49: ...3 26 ...

Page 50: ...AG SMD 6630V90135D CN CN SPK L SPK R CN VOLUME 10P 1 25 mm AG SMD 6602T12005J 10P 1 25 mm AG SMD 6602T12005J CN LED 6P 1 25 mm ST SMD 6602T12004E 6P 1 25 mm AG SMD 6630V90135D 4P 2 0 mm AG Lock SMD 6630VK20704 CN Wi Fi Module Bottom Top FFC Harness WIRING DIAGRAM ...

Page 51: ... USB_P N I2S BT_RX TX RST RTS CTS SDA SCL PTB Dual DC DC TPS65252 3 3 VS 18 VA 18 VA 5 2VA 1 5 V 3 3 VA 3 3 V 18 VA DCDC MP2315GJ CON CON CON CON CON KEY1 JOG_A B Wi Fi Ready ADD 27 MHz 3 3 V 1 5 V MT8506B PORTABLE ADC PCM1808 L R 3 3 V 5 2 VA B T Wi Fi 3 1 5 LED 1 2 V 5 V CON CON_A KEY2 DISPLAY IR SVC Only I2C SDA SCL I2C AMP_SD CON_A SW0 SW1 SW1 SW2 3 6 VA DC DC MP2315GJ UART NFC 5 V 3 5 V_wifi ...

Page 52: ...NAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTSSHOULDBEREPLACEDONLYWITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE ...

Page 53: ...3 34 3 33 6 13 11 12 15 14 9 7 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 EAX65467701_14_1 9 SD_MAIN 2 2014 06 30 2 MAIN MPEG CIRCUIT DIAGRAM ...

Page 54: ...3 36 3 35 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 MEMORY EAX65467701_14_1 9 SD_MAIN 3 2014 06 30 3 MAIN MEMORY HW TRAP CIRCUIT DIAGRAM ...

Page 55: ...4 VOLUME CIRCUIT DIAGRAM 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 VOLUME EAX65563801_14_1 9 SD 2014 06 30 3 38 3 37 ...

Page 56: ...5 LED CIRCUIT DIAGRAM 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 LED EAX65543301 14_1 9 SD 2014 06 30 3 40 3 39 ...

Page 57: ...504 DDR3 Spec 1 425 1 575 Measured Voltage Vdd 1 5 IC505 Nand Flash Spec 2 7 3 6 Measured Voltage Vdd 3 26 IC700 AMP Spec Vcc 4 5 26 V Vdd 3 3 6 V Measured Voltage Vcc 18 V Vdd 3 3 V 3 42 3 41 CIRCUIT VOLTAGE CHART 1 ICs 2 Capacitors Location Spec Voltage V C710 330 uF 35 V 105 5000 HR 18 6 C900 100 uF 16 V 105 2000 HR 5 2 3 Connectors Test Connector Spec Voltage IN Voltage Out JIG USB CN102 Pin1 ...

Page 58: ...3 44 3 43 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 59: ...3 46 3 45 2 VOLUME P C BOARD 3 LED P C BOARD TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

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