LG LAP340 Service Manual
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LG LAP340 Service Manual

4.1ch base speaker
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Internal Use Only
Website http://biz.lgservice.com
4.1ch Base Speaker
SERVICE MANUAL
MODEL: LAP340
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
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  • Page 1 Internal Use Only Website http://biz.lgservice.com 4.1ch Base Speaker SERVICE MANUAL MODEL: LAP340 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.
  • 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 SOFTWARE UPDATE METHOD ........................1-4 SOFTWARE DOWNLOAD ..........................1-5 1. CONNECTION OF THE JIG ........................1-5 2. SOFTWARE DOWNLOAD ........................1-8 SPECIFICATIONS ............................1-17...

  • 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: Software Update Method

    (It can’t select update fi le. But, it has an update priority. An update priority is as follows. <DSP, IO MICOM, EQ Bin>) Step 2 : Updating the speaker bar(LAP340/341) If you copy a update fi le to an USB memory, you can update.

  • Page 6: Software Download

    SOFTWARE DOWNLOAD 1. CONNECTION OF THE JIG 1) Insert the jig cable in CN903. 2) After inserting the jig cable to CN903. Note) Be careful of the direction of cable when insert the jig cable in CN903 of display jig.
  • Page 7 3) Please insert of another side of jig cable at the back of main set. * Be careful of the direction of cable...
  • Page 8 4-1) Insert the power cord at the back of the main set. 4-2) Power on the sound plate and you can see massage of the display jig. If display jig does not display anything, please check the connection of display jig and cable and main set again.

  • Page 9: Software Download

    2. SOFTWARE DOWNLOAD 2-1. Micom Download 1) Insert the USB memory in display jig. * Micom fi le must be inside of USB memory. 2) Push continuallythe “-” button at the back side of main set and push continually the “7” button of bar remote control until “USB”...
  • Page 10 3) After “USB” display, “SER” will be display. 4) “MICO” display during update. It will take less then 5 minute. 5) After update, display jig and main set will be power off.
  • Page 11 2-2. DSP Download After micom update, please remove USB memory. 1) Power on the main set again. 2) Power on the sound plate and you can see massage of the display jig. If display jig does not display anything, please check the connection of display jig and cable and main set again.
  • Page 12 3) Insert the USB memory in display jig. * DSP fi le must be inside of USB memory. 4) Push continuallythe “-” button at the back side of main set and push continually the “7” button of bar remote control until “USB” massage is diplay in the display jig.
  • Page 13 5) After “USB” display, “SER” will be display. 6) “DSP” display during update. 7) After “DSP” display, “FLAS” display during update. It will take less then 5 minute. 1-12...
  • Page 14 8) After update, display jig and main set will be power off. 1-13...
  • Page 15 2-3. EQ Download After DSP update, please remove USB memory. 1) Power on the main set again. 2) Power on the sound plate and you can see massage of the display jig. If display jig does not display anything, please check the connection of display jig and cable and main set again.
  • Page 16 3) Insert the USB memory in display jig. * EQ fi le must be inside of USB memory. 4) Push continuallythe “-” button at the back side of main set and push continually the “7” button of bar remote control until “USB” massage is diplay in the display jig.
  • Page 17 5) After “USB” display, “SER” will be display. 6) “EQ” display during update. It will take less then 1 minute. 7) After update, display jig and main set will be power off. After update, please remove the display jig and cable from main set. 1-16...

  • Page 18: Specifications

    SPECIFICATIONS • GENERAL Power requirements Refer to the main label on the unit. Power consumption Refer to the main label on the unit. Dimensions (W x H x D) (700 x 38.5 x 320) mm (With foot) Net Weight (Approx.) 3.8 kg Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
  • Page 19 MEMO 1-18...
  • Page 20 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................2-3 1. CABINET AND MAIN FRAME SECTION (LAP340) ................. 2-3 2. PACKING ACCESSORY SECTION ......................2-7...
  • Page 21 MEMO...
  • Page 22 EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION (LAP340) CABLE1 CABLE4 MAIN CABLE2 CABLE5 CABLE5...
  • Page 23 MEMO MEMO...
  • Page 24 2. PACKING ACCESSORY SECTION 801 Owner’s manual 465 Screw (2) 300 Power cord 806 Optical cable 808 Battery 826 Filter, Ferrite Core 829A Cable holder 829 Cable ties for arranging cables (2) 900 Remote control 804 Bag 803 Packing 802A Accessory box 803 Packing 802 Box...
  • Page 25 MEMO...
  • Page 26 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE .......................... 3-2 1. NO POWER PROBLEM (20 VA) ......................3-2 2. NO POWER ON ............................3-3 3. NO AUDIO OUTPUT ..........................3-4 4. NO AUDIO OUT IN OPTICAL FUNCTION ..................... 3-5 5. NO AUDIO OUTPUT IN BT FUNCTION ....................3-6 ELECTRICAL TROUBLESHOOTING GUIDE ....................

  • Page 27: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER PROBLEM (20 VA) No power problem occurs when you power on the unit. 1-1. Solution Replace D951/ D952/ IC901/ Q901/ D921/ Q902/ ZD903. 1-2. How to troubleshoot (Countermeasure) Case 1) 20 VA Voltage Abnormal: Check D951/ D952 and replace it. Case 2) 20 VA Voltage Abnormal: Check IC901/ Q901 and replace it.

  • Page 28: Power On

    ONE POINT REPAIR GUIDE 2. NO POWER ON 2-1. Solution Replace IC100 on main board. 2-2. How to troubleshoot (Countermeasure) 1) Please Check 3.7 VA (yellow signal). 2) 3.7 VA abnormal condition Check IC604 or SMPS parts. 3) 3.7 VA normal, 3.3 VA is abnormal conditions Check IC100 working status.

  • Page 29: Audio Output

    ONE POINT REPAIR GUIDE 3. NO AUDIO OUTPUT 3-1. Solution Check audio out trace step by step. 3-2. How to troubleshoot (Countermeasure) 1) If audio DSP, optical input trace, BT input trace signal is normal, check below procedure. 2) Check power. IC701 Pin3, IC700 Pin2, IC601 Pin3. 3) Normal power output conditions Check IC705 analog output Pin9, 10, 1, 2, 3, 4, 33, 34, 35, 36.

  • Page 30: Audio Out In Optical Function

    ONE POINT REPAIR GUIDE 4. NO AUDIO OUT IN OPTICAL FUNCTION 4-1. Solution Check optical jack, audio DSP and audio output trace on main board. 4-2. How to troubleshoot (Countermeasure) 1) Please check JK301’s Pin1 (optical input signal). 2) Abnormal optical signal input condition Check JK301 working status.

  • Page 31: Audio Output In Bt Function

    ONE POINT REPAIR GUIDE 5. NO AUDIO OUTPUT IN BT FUNCTION 5-1. Solution Check BT module, CN302 and audio output trace on main board. 5-2. How to troubleshoot (Countermeasure) 1) Please check CN302’s Pin5, 7 (BT UART AUDIO). 2) Abnormal BT UART signal input/ output conditions Try replacing CN302 or BT Module.

  • Page 32: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER SUPPLY ON SMPS BOARD No 20 VA Q901 normal? Replace Q901. D951/ D952 normal? Replace D951/ D952. IC901 normal? Replace IC901. Is the VCC (11 V ~ 25 V) supplied to Q902 normal? IC901 Pin5? Power line of main PCB is short.

  • Page 33: Power Supply On Main Board

    ELECTRICAL TROUBLESHOOTING GUIDE 2. POWER SUPPLY ON MAIN BOARD No 3.3 VA Is 20 V supplied to IC604 Pin2? Check SMPS part. Is 3.7 V at L609? Check IC604 working status. Is 3.3 V supplied to IC104 Pin3? Check IC104 working status. Check MICOM working status and replace.

  • Page 34: Power Supply On Amp Board

    ELECTRICAL TROUBLESHOOTING GUIDE 3. POWER SUPPLY ON AMP BOARD No 3.3 VA Is 20 V supplied to IC603 Pin2? Check SMPS part. Is 9.5 V at L608? Check IC603 working status. Is 3.3 V at L600? Check IC602 working status. Is 3.3 V at IC301 Pin97? Check IC301 working status.

  • Page 35: System Part

    ELECTRICAL TROUBLESHOOTING GUIDE 4. SYSTEM PART Power On IC100 LED blinking 3.3V_MICOM, 3.3 V Check IC104. at the front? X100 20.000 MHz Replace X100. Replace IC100 R5F100GEAFB Main Board Work properly Check CN800. CN800 Pin1? Check Q800. It works properly. Front Board 3-10...

  • Page 36: Audio Output In Optical Function

    ELECTRICAL TROUBLESHOOTING GUIDE 5. NO AUDIO OUTPUT IN OPTICAL FUNCTION Optical function. JK301 Pin1 OPT_IN signal OK? Check JK301 or 3.3VA_MICOM. IC303 Pin1, 2 signal OK? Check IC303 or replace. IC301 Pin52, 53, 54 I2S signal OK? Check IC301 or replace. 6.
  • Page 37 ELECTRICAL TROUBLESHOOTING GUIDE IC705 Pin1, 2 signal OK? Check IC705 or replace. IC702 Pin3 signal OK? Check DAC OUT audio trace or replace IC702. IC709 Pin14~18 signal OK? Check IC709 or replace. IC706 ~ 708 Pin29, 27, 21, 23 OK? Check IC706~708 or replace.

  • Page 38: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. SYSTEM PART - MICOM 2. SYSTEM PART - LED Figure 1. Figure 2. IC100 R5F100GEAFB X-TAL 20 MHz IC100 R5F100GEAFB LED Control port 3-13...

  • Page 39: Audio Part - Optical Input

    3. AUDIO PART - OPTICAL INPUT 4. AUDIO PART - BT UART INPUT Figure 3. Figure 4. IC301 ES8690DSC SPDIF_IN port IC301 ES8690DSC BT UART port 3-14...

  • Page 40: System Part - Dac Interface

    5. SYSTEM PART - DAC INTERFACE 6. SYSTEM PART - DSP X-TAL I/O Figure 5. Figure 6. IC100 R5F100GEAFB DAC Control port IC301 ES8690DSC X-TAL 27 MHz 10 11 3-15...

  • Page 41: Audio Part - Dsp I2S

    7. AUDIO PART - DSP I2S 8. AUDIO PART - DAC OUTPUT Figure 7. Figure 8. IC301 ES8690DSC(Audio DSP) I2S for Audio 16 17 3-16...

  • Page 42: Audio Part - Line Driver Output

    9. AUDIO PART - LINE DRIVER OUTPUT 10. AUDIO PART - VOLUME IC OUTPUT Figure 9. Figure 10. 3-17...

  • Page 43: Audio Part - Amp Ic Output

    11. AUDIO PART - AMP IC OUTPUT Figure 11. 3-18...

  • Page 44: Wiring Diagram

    WIRING DIAGRAM SMPS MAIN (FR-4 4LAYER 1.2T) SW UNIT SW UNIT LED / RCU Bluetooth FR & SR UNIT FL & SL UNIT 3-19 3-20...

  • Page 45: Block Diagram

    BLOCK DIAGRAM S/E_FL+ Diff._FL+ S/E_FL- Diff._FL- S/E_SL+ MCLK Diff._SL+ SPDIF_IN S/E_SL- Diff._SL- Filter Optical LRCK TPA3118D2 ADATA0 ADATA1 ADATA2 Diff._SW+ S/E_SW+ Diff._SW- S/E_SW- (ES8690DSC) Volume Filter SDRAM Diff._FR+ S/E_FR+ (8MB) Diff._FR- (ES9006) S/E_FR- TPA3118D2 Diff._SR+ S/E_SR+ Diff._SR- S/E_SR- EM638165TSA-6G Filter 27MHZ TPA3118D2 DAC_RST...

  • Page 46: Circuit Diagrams

    DESIGN BE MODIFIED OR ALTERED WITHOUT DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. 1. MAIN - SMPS CIRCUIT DIAGRAM...

  • Page 47: Main - Power Circuit Diagram

    2. MAIN - POWER CIRCUIT DIAGRAM POWER EAX65361601_15.1.6_Main_SD_5 2013. 10. 10 3-25 3-26...

  • Page 48: Main - Micom Circuit Diagram

    3. MAIN - MICOM CIRCUIT DIAGRAM 10 11 MICOM : WAVEFORM NUMBER EAX65361601_15.1.6_Main_SD_2 2013. 10. 10 3-27 3-28...

  • Page 49: Main - Audio Dsp Circuit Diagram

    4. MAIN - AUDIO DSP CIRCUIT DIAGRAM 16 17 AUDIO DSP : WAVEFORM NUMBER EAX65361601_15.1.6_Main_SD_3 2013. 10. 10 3-29 3-30...

  • Page 50: Main - Dac/ Amp Circuit Diagram

    5. MAIN - DAC/ AMP CIRCUIT DIAGRAM DAC/AMP : WAVEFORM NUMBER EAX65361601_15.1.6_Main_SD_4 2013. 10. 10 3-31 3-32...

  • Page 51: Led Circuit Diagram

    6. LED CIRCUIT DIAGRAM 7. KEY CIRCUIT DIAGRAM EAX65378501_15.1.7_LED_SD EAX65425901_15.1.7_Key_SD 2013. 10. 10 2013. 10. 10 3-33 3-34...

  • Page 52: Circuit Voltage Chart

    MEMO CIRCUIT VOLTAGE CHART Loca No. Description Pin No. Voltage Spec Measured Voltage Main Board C707 Min 20V 20.79V C708 Min 20V 20.79V C709 Min 20V 20.79V Capacitor,AL,Radial C710 Min 20V 20.79V C711 Min 20V 20.79V C712 Min 20V 20.79V C7L6 >0V 0.982V...

  • Page 53: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P. C. BOARD (TOP VIEW) 3-37 3-38...
  • Page 54 MAIN P. C. BOARD (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-39 3-40...

  • Page 55: Led P. C. Board

    2. LED P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3. KEY P. C. BOARD (TOP VIEW) (BOTTOM VIEW) 3-41 3-42...

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