LG NP8340 Service Manual Download Page 21 | Manualshive

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3-2

ONE POINT REPAIR GUIDE

1. NO POWER PROBLEM (19 VA)

No power problem occurs when you power on the unit.

1-1-1. Solution

Replace IC901/ IC902/ ZD901/ ZD903/ D901/ D902/ D933/ F901.

1-1-2. How to troubleshoot (Countermeasure)

Case 1) 19 VA voltage abnormal: Check IC901/ IC902/ ZD901/ ZD903/ D901/ D902/ D933 and replace it.

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

< Main board top view >

D933

D933

IC901

IC901

IC902

IC902

D901

D901

D902

D902

ZD901

ZD901

ZD903

ZD903

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20
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Summary of Contents for NP8340

Page 1: ... MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only Website http biz lgservice com MODEL NP8340 MODEL NP8340 SMART Hi Fi AUDIO Wireless Multi room JULY 2015 P NO AFN77272340 ...

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: ...68 0 1 Subnet mask 255 255 255 0 Gateway 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 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: ...y network indicator lamp Updating Blinking red LED B E Complete update Blinking white LED Updating Blinking red LED Option MEQ Complete update Download result display indicate OK Updating Blinking B T Wi Fi LED Micom Complete update Reboot ...

Page 10: ...1 9 2 Using APP 1 Connect set and music flow app 2 Select setup 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 Wi Fi SETUP key ...

Page 13: ...cross LAN cable Setting PC IP 192 168 0 1 Subnet mask 255 255 255 0 Gateway 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: ...C Operating humidity 5 to 90 AMPLIFIER Mono mode 30 W Woofer 10 W Tweeter T H D 10 SPEAKERS Type Built in Impedance 4 Ω Rated Input Power 15 W Max Input Power 30 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 with 802 11a b g n Wi Fi networks Design and specifications are subje...

Page 15: ...1 14 ...

Page 16: ...2 1 SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 3 1 CABINET AND MAIN FRAME SECTION 2 3 2 PACKING ACCESSORY SECTION 2 5 ...

Page 17: ...2 2 ...

Page 18: ...CTION BT WiFi MAIN NFC TOUCH LED E D E B A D B F A C F C 464 A41 250 253 457 254 A43 251 464 251 252 256 452 260 264 265 263 452 A52 472 472 465 266 258 257 A46 464 262 A45 255 A54 261 457 464 464 464 CABLE2 CABLE5 CABLE3 CABLE1 CABLE4 268 267 ...

Page 19: ...2 PACKING ACCESSORY SECTION 801 Owner s manual 804 Bag 803 Packing 802 Box 300 Power cord 803 Packing 831 LAN cable ...

Page 20: ...MORY IC 3 11 11 IF NOT BOOTING WHEN YOU TURN ON THE SET CRYSTAL 3 12 12 WIRED NETWORK CONNECTION ERROR 3 13 ELECTRICAL TROUBLESHOOTING GUIDE 3 14 1 POWER SUPPLY ON MAIN BOARD 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 25 BLOCK DIAGRAMS 3 27 1 OVERALL BLOCK DIAGRAM 3 27 2 POWER BLOC...

Page 21: ... Replace IC901 IC902 ZD901 ZD903 D901 D902 D933 F901 1 1 2 How to troubleshoot Countermeasure Case 1 19 VA voltage abnormal Check IC901 IC902 ZD901 ZD903 D901 D902 D933 and replace it 1 1 3 Service hint Any picture Remark Main board top view D933 D933 IC901 IC901 IC902 IC902 D901 D901 D902 D902 ZD901 ZD901 ZD903 ZD903 ...

Page 22: ...Solution Replace IC805 on MAIN board 2 1 2 How to troubleshoot Countermeasure 1 Please Check 19 VA of IC805 Pin2 IN 2 If 19 VA is abnormal follow the stage 1 1 at the previous page 3 If 19 VA is OK but 5 2 VA is abnormal check the parts L813 L814 R843 R845 R846 R847 R604 R606 R607 And then change the weird one 2 1 3 Service hint Any picture Remark ...

Page 23: ...C802 Pin11 Pin12 check the PWR_CTRL1 s level If level ishigh checkthe around parts R821 R820 R819 L809 and if there s no defective component replace IC802 If the PWR_CTRL1 level is Low follow the stage 7 1 4 If 5 2 VA is OK but 1 2 VA is abnormal at the IC802 Pin9 Pin10 check the PWR_CTRL1 s level If level ishigh checkthe around parts R833 R832 R831 L810 and if there s no defective component repla...

Page 24: ...DD of C715 C735 and 3 3 V DVDD of L706 2 If 19 VA is abnormal follow the stage 1 1 at the previous page 3 If 3 3 V is abnormal follow the stage 4 1 at the next page 4 If 19 VA 3 3 V are OK but no sound from the speaker replace IC700 IC701 5 When you followed above step but it doesn t work check the around parts RLC 4 1 3 Service hint Any picture Remark Main board bottom view IC701 IC701 IC700 IC70...

Page 25: ...roubleshoot Countermeasure 1 Please check 5 2 VA of IC804 Pin3 INPUT 2 If 5 2 VA is abnormal follow the stage 2 1 at the previous page 3 If 5 2 VA is OK but 3 6 VA is abnormal at the IC804 VOUT Pin4 replace IC804 4 When you followed above step but It doesn t work check the around parts R827 R828 L807 5 1 3 Service hint Any picture Remark Main board top view IC804 IC804 ...

Page 26: ...leshoot Countermeasure 1 Please Check 19 VA of IC800 Pin2 VIN 2 If 19 VA is abnormal follow the stage 1 1 at the previous page 3 If 19 VA is OK but 3 3 V is abnormal at the IC800 Pin7 replace IC800 4 When you followed above step but it doesn t work check the around parts L800 L801 L811 R829 R830 R841 R834 R838 R839 R806 6 1 3 Service hint Any picture Remark IC800 IC800 ...

Page 27: ...If 3 3 VA is abnormal follow the stage 5 1 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 7 1 3 Service hint Any picture Remark Main board bottom view Main board top view IC103 IC103 ...

Page 28: ... your eyes 2 Check 1 2 V of L810 If 1 2 V is abnormal follow the stage 3 1 at the previous page 3 Check 1 5 V of L809 If 1 5 V is abnormal follow the stage 3 1 at the previous page 4 Check 3 3 V of L811 If 3 3 V is abnormal follow the stage 6 1 at the previous page 5 When you followed above step but it doesn t work replace the IC501 8 1 3 Service hint Any picture Remark Main board bottom view IC50...

Page 29: ... 0 75 V of DDR3_VREF Point 2 If voltage is abnormal follow the stage 3 1 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 at the previous page 6 When you followed above step but it doesn t work replace the IC503 IC504 9 1 3 Service hint Any picture Remark Main board bott...

Page 30: ...lution Replace IC505 on MAIN board 10 1 2 How to troubleshoot Countermeasure 1 Check 3 3 V of R512 R511 C5B1 2 If 3 3 V is abnormal follow the stage 6 1 at the previous page 3 When you followed above step but it doesn t work replace the IC505 10 1 3 Service hint Any picture Remark Main board top view IC505 IC505 ...

Page 31: ...ion Replace X501 on MAIN board 11 1 2 How to troubleshoot Countermeasure 1 Check the frequency of 27 MHz crystal X501 2 If 3 3 V is abnormal follow the stage 6 1 at the previous page 3 If the crystal doesn t oscillate replace X501 11 1 3 Service hint Any picture Remark Main board bottom view X501 X501 ...

Page 32: ...0 on MAIN board 12 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 8 1 at the previous page 12 1 3 Service hint Any picture Remark Main board bottom view JK500 JK500 ...

Page 33: ...Replace weird one Check Inlet Socket and replace it YES YES YES NO NO ELECTRICAL TROUBLESHOOTING GUIDE 1 POWER SUPPLY ON MAIN BOARD No 5 2 VA Is the Vcc of IC805 19 VA Is the L803 of IC805 5 2 VA Around the parts OK RLC Check the 19 VA Replace the weird one Replace IC805 OK YES YES YES YES NO NO NO ...

Page 34: ...plied to IC802 L803 Around the IC802 parts OK RLC Around the IC802 parts OK RLC Check the IC805 Check the IC805 Replace the weird one Replace the weird one Replace the IC802 Replace the IC802 YES YES YES YES YES YES NO NO NO NO ELECTRICAL TROUBLESHOOTING GUIDE POWER SUPPLY ON MAIN BOARD ...

Page 35: ...heck the 19 V Replace the weird one Replace the IC800 YES YES YES NO NO ELECTRICAL TROUBLESHOOTING GUIDE No 3 6 VA Is the Vin 5 2 VA supplied to IC804 L807 Around the IC804 parts OK RLC Check the IC805 Replace the weird one Replace the IC804 YES YES YES NO NO POWER SUPPLY ON MAIN BOARD ...

Page 36: ...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 37: ...n t blinking Cable connection is OK CN101 CN300 CN301 CN400 3 6 V load on L301 Check the IC300 Pin17 18 19 20 signal Connect the cable correctly or replace it Check power circuit troubleshooting Replace IC300 Replace LD401 LD402 YES YES YES YES NO NO NO ...

Page 38: ... Vdd of IC700 IC701 Pin27 3 3 V Check power circuit troubleshooting Check power circuit troubleshooting YES YES YES YES NO NO Check AMP I2S signal IC700 Pin20 23 24 Check PWM signal IC700 Pin1 4 43 36 Check audio signal CN701 Replace IC700 Replace IC700 IC701 Check L700 L701 and speaker cable connection YES YES YES NO NO NO OK ...

Page 39: ... TROUBLESHOOTING GUIDE Check mode Wi Fi B T Check 3 3 V CN501 Pin10 Check UART signal CN500 Pin4 6 7 8 Check power circuit troubleshooting Check the B T module replace it OK YES YES YES NO NO 4 2 AUDIO BLUETOOTH MODE ...

Page 40: ...3 21 WAVEFORMS OF MAJOR CHECK POINT 1 MICOM 2 AMP MICOM to MPEG IC103 PIN 34 35 MICOM to AMP I2S IC700 PIN 20 21 23 tpjvt hy tpjvt hy y ijsr syjsr kh h 1 2 4 3 5 1 2 5 3 4 ...

Page 41: ...3 22 3 MPEG IC501 MT8506 XTAL 27 MHz 6 IC501 MT8506 WE IC501 MT8506 CLK 7 8 6 7 8 ...

Page 42: ...3 23 MPEG IC501 MT8506 CAS 9 IC501 MT8506 BA0 10 9 10 ...

Page 43: ...3 24 4 BLUETOOTH 5 Wi Fi BT_TX BT_RX BT_RT Wi Fi_N Wi Fi_P i i y i yz pmp u pmp w 12 11 13 14 15 13 11 12 14 15 ...

Page 44: ... CN CN CN AC JACK 4P 2 0 mm ST Harness SMD EAG63270202 6P 1 00 mm AG FFC SMD EAG62611101 10P 1 0 mm AG FFC SMD EAG62611102 CN 4P 1 0 mm ST SMD 6630R FB02D MICOM DEBUG 6P 1 25 mm AG Harness SMD 6630V90135D 3P 3 96 mm ST Harness SMD 561 292B 6P 1 00 mm ST FFC SMD 6630XE00106 6P 1 25 mm ST Harness SMD 6602T12004E MAIN WIRING DIAGRAM ...

Page 45: ...HY_TDP N EPHY_RDP N Wi Fi_P N USB_P N BT_RX TX RST RTS CTS SDA SCL 3 3 V 19 VA 3 3 VA CON CON CON CON TOUCH Wi Fi Ready ADD 27 MHz 3 3 V 1 5 V MT8506B B T Wi Fi 6 1 1 2 V CON CON_A KEY2 SVC JIG VFD IR R I2C SDA SCL I2C PDN FAULTZ CON_A SW1 5 2 VA 3 6 VA LDO AZ1117 3 6 VA UART MID 3 3 V_Wi SMPS Dual DC DC TPS65252 SW2 1 2 V 1 5 V 3 3 V_W 3 3 V DCDC MP2315GJ SW1 19 VA 5 LPF CON Tweeter 5 2 VA DCDC M...

Page 46: ... 3 V 3 3 V 3 3 V_W 3 3 V_W 3 3 VA 1000 mA 60 mA 420 mA C H2 C H1 U SB 380 mA 3 3 VA 3 3 VA 270 mA 1000 mA 390 mA 220 mA 60 mA 3 3 V 390 mA 360 mA 220 mA 1030 mA 350 mA PCTRL1 19 VA 1100 mA 1 8 W 4 ohm AMP Efficiency 85 PCTRL2 S DB0540 MP2315 4 5 V 24 V 3 A 518 mA 3 3 V 154 mA PCTRL0 TPS65252 4 5 V 16 V 3 A 1604 mA 30 W 19 VA Efficiency 90 Efficiency 85 Efficiency 80 Efficiency 95 LED 2 EA TOUCH 80...

Page 47: ...WITH OUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH 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 SET IS NOT DELAYED UNTIL THE...

Page 48: ...3 34 3 33 1 2 5 3 4 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 EAX66190203_Rev1 0 0 _MAIN_SD2 2015 07 02 2 MAIN MICOM AMP CIRCUIT DIAGRAM ...

Page 49: ...3 36 3 35 6 13 14 11 12 15 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 EAX66190203_Rev1 0 0 _MAIN_SD3 2015 07 02 3 MAIN MPEG CIRCUIT DIAGRAM ...

Page 50: ...3 38 3 37 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 HW TRAP EAX66190203_Rev1 0 0 _MAIN_SD4 2015 07 02 4 MAIN MEMORY HW TRAP CIRCUIT DIAGRAM ...

Page 51: ...5 VOLUME TOUCH KEY1 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 TOUCH KEY1 EAX66190303_Rev1 0 0 _VOLUME_SD 2015 07 02 3 40 3 39 ...

Page 52: ...6 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 EAX66231303_Rev1 0 0 _LED_SD 2015 07 02 3 42 3 41 ...

Page 53: ...1 26 Measured Voltage Vcc33 3 3 V DDRVcc 1 5 V Vcc12 1 2 V IC503 IC504 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 8 26 4 V Vdd 3 3 6 V Measured Voltage Vcc 18 97 V Vdd 3 27 V IC701 AMP Spec Vcc 8 26 4 V Vdd 3 3 6 V Measured Voltage Vcc 18 97 V Vdd 3 27 V Location Spec Voltage V C904 56 uF 460 V 105 2000HR 147 V C924 100...

Page 54: ...3 46 3 45 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 55: ...3 48 3 47 2 TOUCH P C BOARD 3 LED P C BOARD TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

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