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LG SoundPlate LAP250H, Service Manual

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LG SoundPlate LAP250H Service Manual Download Page 18

 3-7

ONE POINT REPAIR GUIDE

5. NO SOUND (USB)

5-1. Solution

Replace IC502 on MAIN board.

5-2. How to troubleshoot (Countermeasure)

1) Please check USB voltage (5 V) of JK503 (pin1).
2) Please check USB data signal (D-, D+ ) of IC502 (to check pin2, pin3 at JK503).
    If you have not data signal, please replace IC502.

5-3. Service hint (Any picture / Remark)

< MAIN board top view >

JK503

JK503

(pin1)

(pin1)

Summary of Contents for SoundPlate LAP250H

Page 1: ...SERVICE MANUAL MODEL LAP250H CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LAP250H SERVICE MANUAL P NO AFN76552488 JANUARY 2015 Website http biz lgservice com Internal Use Only ...

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

Page 3: ...1 2 SECTION 1 GENERAL CONTENTS ESD PRECAUTIONS 1 3 HIDDEN KEY MODE 1 4 MCS EQ PROGRAM UPDATE GUIDE 1 5 SPECIFICATIONS 1 6 ...

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: ...set Volume Remote control SOUND EFFECT VERSION CHECK Main set Volume Remote control Play UP REPEAT Up DOWN Stop Ok Down RIGHT F Skip Right LEFT B Skip Left ENTER Play Pause Enter WIRELESS FACTORY Main set VOL MIN volume minimum state Remote control Mute for 5 seconds ...

Page 6: ...play in LCD MCS MCS UP FINISH Power Off EQ EQ UP FINISH Power Off 5 Loading is shown while updating Never remove USB or AC cord 6 After update finish show FINISH in VFD and power of automatically 7 Power cord un plug 3 Option Check 1 Power On 2 Press Set Volume KEY and Remote Control Play KEY during 3 seconds 3 Check MCS Version Ex 4 Press Remote Control 3 seconds time Check EQ Version Ex 5 Plug O...

Page 7: ... C Operating humidity 5 to 90 INPUT OUTPUT OPT IN Optical jack x 1 PORTABLE IN 0 5 Vrms 3 5 mm stereo jack x 1 HDMI IN 19 Pin Type A HDMI connector x 2 HDMI OUT 19 Pin Type A HDMI connector x 1 Available Digital Input Audio Sampling Frequency 32 kHz 44 1 kHz 48 kHz 96 kHz USB Version 2 0 Bus Power Supply 5 V 500 mA AMPLIFIER Total 100 W Front 25 W x 2 8 Ω at 1 kHz Subwoofer 50 W 4 Ω at 80 Hz THD 1...

Page 8: ...2 1 SECTION 2 CABINET MAIN CHASSIS CONTENTS PANEL DISASSEMBLY INSTRUCTIONS 2 2 EXPLODED VIEWS 2 3 1 CABINET AND MAIN FRAME SECTION 2 3 2 PACKING ACCESSORY SECTION 2 5 ...

Page 9: ...2 2 PANEL DISASSEMBLY INSTRUCTIONS 1 Please use a tool such as Fig 1 2 Panel disassembly in accordance with four hole criteria Fig 1 Fig 2 ...

Page 10: ...2 516 271 272 516 252 252 253 516 464 462 A43 263 464 464 462 462 262 261 A41 464 251 251 271 272 273 274 275 464 A52 462 462 443 443 443 256 443 470 462 462 255 A46 A47 516 271 CABLE1 A42 254 EXPLODED VIEWS 1 CABINET AND MAIN FRAME SECTION ...

Page 11: ... ACCESSORY SECTION 801 Owner s manual 806 Optical cable 820 USB extension cable Not supplied 808 Battery 900 Remote control 300 Power cord OPTIONAL PART 803 Packing 804 Bag 802 Box 803 Packing 802A Accessory box ...

Page 12: ...4 1 CRYSTAL 3 14 2 FLASH MEMORY 3 15 3 TACT KEY 3 16 4 USB 3 17 5 REMOTE CONTROL 3 18 6 OPTICAL 3 19 7 PORTABLE 3 21 8 AUDIO PWM 3 22 9 AUDIO AMP 3 23 WIRING DIAGRAM 3 25 BLOCK DIAGRAMS 3 27 1 BLOCK DIAGRAM 1 3 27 2 BLOCK DIAGRAM 2 3 29 3 VOLTAGE BLOCK DIAGRAM 3 31 CIRCUIT DIAGRAMS 3 33 1 SMPS CIRCUIT DIAGRAM 3 33 2 MAIN DSP CIRCUIT DIAGRAM 3 35 3 MAIN AMP CIRCUIT DIAGRAM 3 37 4 MAIN POWER CIRCUIT...

Page 13: ...n the unit 1 1 Solution Replace SMPS board 1 2 How to troubleshoot Countermeasure 1 Check the PVDD voltage 22 2 V at pin4 pin5 pin6 When you check the no power at this point then replace SMPS PCB board 1 3 Service hint Any picture Remark MAIN board top view PVDD PVDD CN601 pin4 6 CN601 pin4 6 ...

Page 14: ...If 12 VA is not checked at the point then find 22 VA at pin7 of IC600 3 2 is OK Replace IC600 2 2 IC603 1 Check 3 3 VA at L605 2 If 3 3 VA is not checked at the point then find 12 VA at pin3 of IC603 3 2 is OK Replace IC603 MAIN board top view MAIN board top view L601 L601 L605 L605 IC600 pin7 IC600 pin7 IC603 pin3 IC603 pin3 ...

Page 15: ... 2 VA is not checked then find 5 2 VA at pin3 of IC601 3 2 is OK Replace IC601 2 5 IC606 1 Check VCC_3 3 V at L608 2 If VCC_3 3 V is not checked then find 3 3 VA at pin1 of IC606 3 Is the Power control H Check pin3 of IC606 4 2 is OK Replace IC606 3 is No Replace IC502 MAIN board top view MAIN board top view MAIN board top view L604 L604 L602 L602 L608 L608 IC602 pin3 IC602 pin3 IC601 pin3 IC601 p...

Page 16: ...status of portable jack JK502 2 Please check L501 L502 PORT_L PORT_R signal of portable jack JK502 If you cannot find input signal replace portable jack JK502 3 If you can find input signal check pin13 pin14 of IC508 4 If you can t find signal on pin13 and pin14 replace IC508 3 3 Service hint Any picture Remark MAIN board top view L502 L502 L501 L501 IC508 IC508 JK502 JK502 ...

Page 17: ...ck externally status of Bluetooth cable connection on your eyes at CN505 and Bluetooth Module 2 Please check the 3 3 VA at L504 If 3 3 VA is OK at L504 please check BT_TX BT_RX BT_RST pin25 pin27 pin29 of IC502 3 If you have no signal please replace IC502 4 3 Service hint Any picture Remark MAIN board top view IC502 IC502 L504 L504 CN505 CN505 ...

Page 18: ... 5 2 How to troubleshoot Countermeasure 1 Please check USB voltage 5 V of JK503 pin1 2 Please check USB data signal D D of IC502 to check pin2 pin3 at JK503 If you have not data signal please replace IC502 5 3 Service hint Any picture Remark MAIN board top view JK503 JK503 pin1 pin1 ...

Page 19: ...hoot Countermeasure 1 Please check 3 3 VA at L525 If you can check 3 3 VA please confirm OPT_DET signal R5E8 in MAIN board when optical mode 2 In spite of process 1 set has abnormal output then replace IC507 6 3 Service hint Any picture Remark MAIN board top view JK501 JK501 L525 L525 IC507 IC507 R5E8 R5E8 ...

Page 20: ...connection 1 Check the HDMI jack connection correctly each port JK801 JK802 IN JK800 OUT 7 2 IC803 1 Check 3 3 V at pin1 pin4 of IC803 and 1 08 V at L803 nearby pin8 of IC803 2 If 3 3 VA is not output check 3 3 VA at pin1 of IC802 3 1 2 is OK Replace HDMI board IC803 IC803 IC802 IC802 JK802 JK802 JK801 JK801 JK800 JK800 ...

Page 21: ...JK501 Replace IC503 Check and replace IC606 Check and replace IC502 Check voltage of IC502 3 3 VA 1 2 VA Check display NO OPTICAL Check X501 is operating Check if the X502 is normal NO NO NO NO NO NO NO NO NO Check IC601 IC603 12 VA 5 2 VA Check if JK501 connection is good Check M CLK of IC503 is good Check If Voltage 3 3 V IC507 Check I2C data to pin9 of IC507 is the normal YES YES YES YES YES YE...

Page 22: ...502 Check USB jack JK503 Display READ Check and replace IC605 IC606 Replace IC502 Display NO FILE Check and replace IC508 Display NO USB Check display NO PORTABLE Check if the IC508 normal NO NO NO NO NO NO NO NO NO Check USB_5V Check if JK502 connection is good Check USB D FL500 Check is the pin4 of IC508 is 3 3 V 5 0 V Check IC502 pin62 64 Check I2S data to pin6 7 of IC508 is the Normal YES YES ...

Page 23: ...C803 is 3 3 V 1 0 V NO NO YES YES YES 6 AMP PART CHECK AMP part check Check each line resistor output voltage Check IC700 701 pin13 26 3 3 V input OK Check IC700 701 PWM put pin23 24 Check IC700 701 I2C input pin20 22 Check output line coil Replace IC700 IC701 Check IC502 output if it s no output replace IC502 Replace the coil Check IC700 IC701 pin3 4 pin33 34 22 5 V input NO NO NO NO YES YES YES ...

Page 24: ...CD DISPLAY CHECK LCD display check Replace LCD module OK Check the connection CN501 Check the connection CN301 Check if LCD light On NO NO NO Check if harness connection is good Check CN301 voltage condition 12 V 5 V 3 3 V is good YES YES YES ...

Page 25: ...3 14 WAVEFORMS OF MAJOR CHECK POINT 1 CRYSTAL FIG 1 1 X501 24 MHz 1 FIG 1 2 X502 24 576 MHz 2 FIG 1 3 X801 27 MHz 3 1 2 3 ...

Page 26: ...3 15 2 FLASH MEMORY FIG 2 VCC CS CLK DO 4 5 6 7 5 6 4 7 VCC CS CLK DO ...

Page 27: ...3 16 3 TACT KEY FIG 3 1 Press Power Key FIG 3 2 Press FUNC Key 1 1 13 V 0 72 0 82 V 8 9 FIG 3 3 Press VOL Key 0 424 0 485 V 10 FIG 3 4 Press VOL Key 0 V 11 9 11 8 10 ...

Page 28: ...3 17 4 USB FIG 4 1 USB_5V 12 FIG 4 2 USB D 13 FIG 4 3 USB D 14 12 14 13 ...

Page 29: ...NTROL FIG 5 1 Input Voltage 15 FIG 5 2 Low Timing 16 FIG 5 3 High Timing Item Measured Spec Input Level 3 3 V IR Receiver Spec 2 7 5 5 V Low Timing 4 4 ms 3 6 ms 5 04 ms High Timing 4 48 ms 4 08 ms 5 04 ms 17 15 17 16 ...

Page 30: ...3 19 6 OPTICAL FIG 6 1 OPT_IN 18 FIG 6 2 OPT_DET 19 19 18 ...

Page 31: ...3 20 7 PORTABLE FIG 7 1 ADC IC_5V 20 FIG 7 2 ADC IC_ 3 3V 21 FIG 7 3 Analog Input Voltage 1 1 27 Vrms 22 22 20 21 ...

Page 32: ...3 21 8 AUDIO PWM 1 2 FIG 8 1 PWM IC_3 3V FIG 8 2 PWM IC_22 04V 23 24 FIG 8 3 BCK 25 FIG 8 4 LRCK 26 24 25 26 23 ...

Page 33: ...3 22 AUDIO PWM 2 2 FIG 8 5 Subwoofer FIG 8 6 Subwoofer SWF 352 73 kHz SWF 352 73 kHz 27 28 FIG 8 7 Front L FL FL 352 73 kHz 29 FIG 8 8 Front R FR FR 352 73 kHz 30 28 27 29 30 ...

Page 34: ...3 23 9 AUDIO AMP FIG 9 1 AMP IC PVDD PVDD 22 1 V 31 FIG 9 2 AMP IC DVDD AMP_PDN 1S PVDD DVDD AMP_PDN 31 32 33 31 32 33 ...

Page 35: ...3 24 ...

Page 36: ...R 4 EPOXY 4LAYER B IN 8P B FRONT 1 FR 4 EPOXY 2 LAYER SMT 8P S SMT 14P S B to B 10P S SMT 14P S SMT 10P S BT B to B 10P S HDMI Out USB Optical Portable HDMI IN 1 HDMI IN 2 B to B LCD Display IR Receiver PWR FUNC Vol Vol 3 26 3 25 WIRING DIAGRAM ...

Page 37: ...533 Silicon 27 MHz I2C P_CTRL KEY TMDS I2C CS8422 Analog L R 24 MHz LPF PWM AMP TAS5733 x 2 EA I2C I2S Serial Flash 1 M HDMI OUT USB Optical In Portable In BT_I2C BT_UART 2 1 ch SDRAM 8 MB I2S TMDS TMDS HDMI IN DCDCs PCM1808 I2S SPI Serial Flash 8 M SPI 24 576 MHz MCLK BCK LRCK ADATA 3 28 3 27 BLOCK DIAGRAMS 1 BLOCK DIAGRAM 1 ...

Page 38: ...X SCL SDA ARC HDMI IN HDMI OUT 1 USB D D RMC Flash 8 MB SPI Flash EQ 1 MB I2C SDRAM 8 MB Dolby DTS PCM MPEG 2 AAC LGE Pre PP Scaling 48 dB DTS 2 0 Down_mix SUB_WF Summing 3 Band SCV SFX Dynamic Loudness Audio Delay Offset Gain Controller LG Post PP 24 bit Max Min Trunc LGPP_DOW NMIX_221 Scaling 36 dB Portable IN Optical IN TX_LRCK TX_BCK ADC_LRCK MAIN_PWR_CTRL MCS_RST PWM SDA SCL BT_RST DIR_SDA SC...

Page 39: ...e P sense 11 mA 43 mA 32 mA 15 mA 1 83 A 3 3 VA 3 3 VA 3 3 VA 3 3 VA 20 mA 96 mA USB_3 3VA 30 mA 30 mA 25 mA 85 mA 20 mA 20 mA 3 mA 0 5 mA 25 mA 10 mA 15 mA 15 mA 35 mA 22 VA TPS563200 BB2242G TPS563200 TPS563200 5 2 VA 1 2 VA 5 0 V VCC_3 3V AMP_3 3V 1 2 VA USB_1 2VA PLL_1 2VA AVCC_5V LCD_5V USB_5V BB2242G 3 3 VA VCC_3V3 TPVDD_1 0V LDO TAS5733 AMP_3 3V 3V3AMP 22V_PVDD 32 mA 15 mA 1 83 A 13 mA 33 m...

Page 40: ...RVICING THIS CHASSIS UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT 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 O...

Page 41: ... 6 4 7 22 20 21 2 19 18 9 11 8 10 1 14 13 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 EAX66168901_Rev1 7 18 MAIN 2 2015 01 14 3 36 3 35 2 MAIN DSP CIRCUIT DIAGRAM ...

Page 42: ...27 24 25 26 23 31 32 33 WAVEFORM NUMBER 28 29 30 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 AMP EAX66168901_Rev1 7 18 MAIN 3 2015 01 14 3 38 3 37 3 MAIN AMP CIRCUIT DIAGRAM ...

Page 43: ...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 POWER EAX66168901_Rev1 7 18 MAIN 4 2015 01 14 3 40 3 39 4 MAIN POWER CIRCUIT DIAGRAM ...

Page 44: ...3 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 HDMI EAX66168901_Rev1 7 18 MAIN 5 2015 01 14 3 42 3 41 5 MAIN HDMI CIRCUIT DIAGRAM ...

Page 45: ...15 17 16 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 FRONT EAX66229101_Rev1 3 10 2014 12 31 3 44 3 43 6 FRONT CIRCUIT DIAGRAM ...

Page 46: ...SiI9533 12 31 0 9V 1 1 TPVDD10 0 99 C827 13 32 0 9V 1 1 TPVDD10 0 99 C829 14 33 2 97 3 63 HDMI_3V3 3 27 C832 45 4 50 5 50 VCC_5V 5 18 C835 62 0 9V 1 1 TPVDD10 0 99 C825 63 2 97 3 63 VCC_3V3 3 27 C824 67 72 0 9V 1 1 TPVDD10 0 99 C811 77 0 9V 1 1 TPVDD10 0 99 C816 88 2 97 3 63 VCC_3V3 3 27 C813 IC802 IC LDO Voltage Regulator 1 2 97 3 63 3 3VA 3 28 C807 6 2 97 3 63 HDMI_3V3 3 27 C821 IC803 IC LDO Vol...

Page 47: ...VCC_12V 12 02 12 01 10 80 13 2 12 3 3VA 3 29 3 29 2 97 3 63 13 GND 0 0 0 14 REMOCON X X X CN504 MAIN BT MODULE 1 CTS X X X 2 3 3VA 3 29 3 29 3 00 3 60 3 TXD X X X 4 RTS X X X 5 RXD X X X 6 GND 0 0 0 7 GND 0 0 0 8 GND 0 0 0 9 SDA X X X 10 SCL X X X 11 RESET X X X 12 GND 0 0 0 3 48 3 47 3 CONNECTORS PIN NO PIN NAME INPUT V OUTPUT V SPEC CN601 MAIN SMPS 1 GND 0 0 0 2 GND 0 0 0 3 GND 0 0 0 4 PVDD 22 0...

Page 48: ...3 50 3 49 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD TOP VIEW BOTTOM VIEW NOTE Warning Parts that are critical with respect to risk of fire or electrical shock ...

Page 49: ...3 52 3 51 2 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 50: ...3 54 3 53 3 FRONT P C BOARD TOP VIEW BOTTOM VIEW ...

Page 51: ...3 56 3 55 ...

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