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LG OM4560, Service Manual

The LG OM4560 is a powerful audio system that delivers impressive sound quality. Finding your way around this device is a breeze with its user-friendly interface and a comprehensive Simple Manual available for free download at manualshive.com. Get the most out of your entertainment experience with this easy-to-use manual!

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No PVDD

YES

F901 normal?

TH901 normal?

D951 normal?

BD901 normal?

Q901 normal?

Is Vcc

(10 V ~ 18 V) supplied to

IC911 Pin4?

Is there about 2.5 V

at IC951 Pin1?

Replace F901 (Use the same fuse).

Check or replace 

R959, R960, R961, R963, R964.

Replace TH901.

Replace D951.

Replace BD901.

Replace Q901.

R959, R960, R961, R963, R964 normal?

Replace IC951.

YES

YES

YES

YES

YES

YES

NO

YES

NO

NO

NO

NO

NO

NO

NO

Power line of main PCB is short.

3-20

ELECTRICAL TROUBLESHOOTING GUIDE

Summary of Contents for OM4560

Page 1: ...SERVICE MANUAL SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only APRIL 2016 MODEL OM4560 MODEL OM4560 MINI HI FI AUDIO P NO AFN77483237 ...

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

Page 3: ... SUMMARY CONTENTS SERVICING PRECAUTIONS 1 3 ESD PRECAUTIONS 1 5 HIDDEN KEY MODE 1 6 SERVICE INFORMATION FOR EEPROM 1 7 PROGRAM DOWNLOAD UPDATE GUIDE 1 8 1 MCS PROGRAM 1 8 2 EQ PROGRAM 1 9 SPECIFICATIONS 1 10 1 2 ...

Page 4: ...age the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the lens surface therefore a cot ton ...

Page 5: ... replacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench should be covered with a conductive sheet and grounded When removing the laser pick up from its conductive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent ...

Page 6: ...t 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 comparable conductive mat...

Page 7: ...IP 3 Clear EEPROM Front Key STOP RCU Key 4 Edit EEPROM Front Key STOP RCU Key You can change the digit of option by SKIP You can edit 0 f by REPEAT or PLAY PAUSE key 5 Bluetooth DUT Front Key POWER RCU Key POWER Block by network provision BT Auto Power On Disable Enable Bluetooth model only 6 Power Disc Lock On Off CD Function Only Active Front Key STOP RCU Key EQ or FRONT CD OPEN 7 Amp Clip On Of...

Page 8: ...conds Remote control Key Button and Front STOP Key Button push same timing FLD no disc status or AUX status FLD write ok FLD OP 0 FLD E2P CLR Remote Control or can be moved by using the Key Each option Repeat Value or STOP Value using the Key Value of options to change the code there Completed 1 7 SERVICE INFORMATION FOR EEPROM ...

Page 9: ... then download the file to your set Caution When downloading the file you should neither unplug the USB device change to the other function nor power off the device USB device must be unplugged when the downloading process is completed ON VFD DISPLAY SCREEN NO USB Insert USB device at USB function SEARCH FIRMWARE FINISH POWER OFF AUTOMATICALLY When completed remove USB device 1 8 PROGRAM DOWNLOAD ...

Page 10: ...ity software then download the file to your set Caution When downloading the file you should neither unplug the USB device change to the other function nor power off the device USB device must be unplugged when the downloading process is completed ON VFD DISPLAY SCREEN NO USB Insert USB device at USB function SEARCH FIRMWARE FINISH POWER OFF AUTOMATICALLY When completed remove USB device 1 9 ...

Page 11: ...PUTS OUTPUTS Analog audio in AUX IN 2 0 Vrms 1 kHz 0 dB 600 Ω RCA jack L R Analog audio out AUX OUT 2 0 Vrms 1 kHz 0 dB 600 Ω RCA jack L R Microphone Sensitivity 15 mV 1 kHz 6 3 mm jack x 1 TUNER FM Tuning Range 87 5 to 108 0 MHz or 87 50 to 108 00 MHz AMPLIFIER RMS OUTPUT POWER Total 220 W x 1 3 Ω at 1 kHz 20 THD SYSTEM Frequency Response 80 Hz to 20 kHz Signal to noise ratio More than 75 dB 1 kH...

Page 12: ...SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 3 1 CABINET AND MAIN FRAME SECTION 2 3 2 DECK MECHANISM SECTION DM19AB 2 5 3 PACKING ACCESSORY SECTION 2 7 2 1 ...

Page 13: ...2 2 ...

Page 14: ...66 464 250 464 464 464 464 522 A53 261 CABLE5 CABLE2 CABLE3 CABLE4 CABLE1 A50 262 H 300 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 ...

Page 15: ...1439 A001 1002 1043 A005 1016 1013 1015 1020 1439 1018 1019 1012 A006 1045 1026 1049 1437 1437 1024 1024 1024 1024 1437 1005 1001 1003 1004 1011 1030 2 DECK MECHANISM SECTION DM19AB ...

Page 16: ...3 PACKING ACCESSORY SECTION 900 Remote Control 808 Battery 825 FM Wire Antenna 802 Box 801 Owner s Manual 804 Bag 803 Packing 803A Packing ...

Page 17: ......

Page 18: ...30 1 SDRAM 3 30 2 SERVO 3 30 3 AUDIO PATH 3 30 4 USB 3 30 WIRING DIAGRAM 3 31 BLOCK DIAGRAMS 3 33 1 SYSTEM BLOCK DIAGRAM 3 33 2 SMPS BLOCK DIAGRAM 3 35 3 AUDIO PATH BLOCK DIAGRAM 3 37 4 POWER BLOCK DIAGRAM 3 39 CIRCUIT DIAGRAMS 3 41 1 SMPS CIRCUIT DIAGRAM 3 41 2 MAIN DSP CIRCUIT 3 43 3 MAIN RF SERVO CIRCUIT DIAGRAM 3 45 4 MAIN POWER DIAGRAM 3 47 5 MAIN AMP CIRCUIT DIAGRAM 3 49 6 MAIN ANALOG INPUT ...

Page 19: ...bleshoot Countermeasure 1 Check if the fuse F901 is open or short circuit 2 Check if the bridge diode BD901 is short circuit by over current with a digital multi meter 3 Check if the NTC thermistor TH901 is normal or open 1 1 3 Service hint Any picture Remark F901 If F901 is not short circuit replace it with a same specifications one TH901 If TH901 is open replace it with a new one BD901 If BD901 ...

Page 20: ...2 D951 1 2 1 Solution Please check and replace D951 on SMPS board 1 2 2 How to troubleshoot Countermeasure 1 Check the anode cathod voltage of D951 with a digital multi meter it is normally 0 2 0 3 V If it doesn t have any voltage it s destroyed Replace it with a new one 1 2 3 Service hint Any picture Remark SMPS schematic diagram ...

Page 21: ...eck 3 3 V to CN503 in standby mode If there is no 3 6 V check the SMPS 2 Check 12 V F F and PVDD when power on the set If the set doesn t work regardless of what the KEY2 changes high to low while pressing the power button X500 and X501 work normally but if you can not power on the set replace IC502 with a new one on the MAIN board 2 1 3 Service hint Any picture Remark Main board top view Main boa...

Page 22: ...e 1 Check if output from the MAIN board via a DC DC 12VA VCC_5V VCC_3 3V 2 Check if IC502 outputs VFD_D0 VFD_CLK and VFD_STB to the FRONT board 3 check if DIG800 output SW signal to the FRONT board If the SW signal isn t output replace DIG800 with new one 4 check if Q801 and Q802 to the FRONT board If the VH signal isn t output replace Q801 Q802 with new one If the VH signal is output replace DIG8...

Page 23: ... Countermeasure 1 Check the SPDO signal from pin24 of IC401 If no signal check 3 3 V RF and X400 2 Check the SPIN SPIN from IC401 to CN401 for driving SPINDLE motor It is about 3 6 Vp p If no signal check 1 8 V and 5 V for IC400 3 Check if the FFC cable is solidly connected between CN401 and MD 4 Check the MD If the spindle motor is sort circuit or has any trouble it can not rotate CD discs Please...

Page 24: ...t Countermeasure 1 Check the SLDO signal from Pin23 of IC401 If no signal check 3 3 V RF and X400 2 Check the SLED SLED from IC400 to CN401 for driving SPINDLE motor It is about 2 9 Vp p If no signal check 1 8 V and 5 V for IC400 3 Check if the FFC cable is solidly connected between CN401 and MD 4 Check the MD If the sled motor is sort circuit or has any trouble it can not move the pickup module P...

Page 25: ...s from Pin K4 L4 of IC502 to IC400 If no signal check 1 8 V 5 V to IC400 2 Check LOAD from IC408 to CN401 for driving the tray open close motor It is about 3 85 Vp p If no signal check 5 V to IC400 If it has any trouble replace it with a new one 3 Check if the FFC cable is solidly connected between CN401 and MD 4 Check the MD If the tray motor is sort circuit or has any trouble it can not open or ...

Page 26: ...r makes the laser beam be positioned in the center of a track on CD disc 1 Check the TRD signal from Pin14 of IC401 If no signal check 3 3 V RF and X400 2 Check TR TR from IC400 to CN400 for driving the tracking actuator If no signal check 1 8 V and 5 V for IC400 3 Check if the FFC cable is solidly connected between CN400 and MD 4 Check the MD If the pickup module has any trouble it can not move t...

Page 27: ...r makes the laser beam keep a regular interval with the surface of a CD disc 1 Check the FOD signal from Pin13 of IC401 If no signal check 3 3 V RF and X400 2 Check F F from IC400 to CN400 for driving the focusing actuator If no signal check 1 8 V and 5 V for IC408 3 Check if the FFC cable is solidly connected between CN400 and MD 4 Check the MD If the pickup module has any trouble it can not move...

Page 28: ...s from MD is entered to IC401 Refer to the No operation of MD guide on Item 4 2 Check the following I2S signal flow I2S audio signal Interface MCS_BCK IC502_Pin E1 IC700_Pin23 MCS_LRCK IC502_Pin D1 IC700_Pin22 44 1 kHz MCS_DATA IC502_Pin E2 IC700_Pin24 If there is any trouble check the power for each IC The power is normal but if the signal waveform to the IC is distorted or no signal replace it w...

Page 29: ...nals are entered to IC700 Refer to I2S audio signal interface on Item 5 1 2 Check PVDD If PVDD is abnormal check the SMPS 3 Check 12 V for driving the gate of AMP IC IC701 a All the powers are normal but if 12 V is low there is possible for AMP IC to be damaged b Remove L706 one When removed a inductance if 12 V is recovered the IC connected to it was damaged c Replace the IC with a new one 4 Chec...

Page 30: ...ch on the VFD display USB Device into the USB jack the voltage is okay if so not check 5V to pin10 of CN801 2 Check USB D from MAIN board to FRONT board a Check 1 1_D signals pin A7 A8 to IC502 b Check USB signals to CN801 pin1 2 4 5 If there is any trouble check the power for each IC The power is normal but if the signal waveform to the IC is distorted or no signal replace it with a new one 3 Che...

Page 31: ...ntered from IC202 to IC502 If no signal check 5 V 3 3 V ADC for IC202 If is NG replace it a new one 4 Check the following I2S signal flow from IC701 to IC700 Refer to Item 5 1 If there is any trouble check the power for each IC The power is normal but if the signal waveform to the IC is distorted or no signal replace it with a new one 5 Check if the digital audio AMP block is okay Refer to Digital...

Page 32: ... it doesn t work replace TUNER with a new one 2 Check if MCS_BCK MCS_LRCK MCS_MCLK are entered from IC502 to IC202 3 Check if ADC_DATA is entered from IC202 to IC502 If no signal check 5 V 3 3 V ADC for IC202 If is NG replace it with a new one 4 Check the following I2S audio signal flow from IC502 to IC700 Refer to Item 5 1 If there is any trouble check the power for each IC The power is normal bu...

Page 33: ... of 1 second D Protection or S Protection 2 Turn main set power on again 3 Check DC voltage of speaker out channel CN701 pin1 2 4 Check resistor crack cold solder of PWM IC out R707 R745 5 If PWM IC out is ok speaker out has DC voltage replace IC701 AMP IC on MAIN top board 6 1 3 Service hint Any picture Remark Main board top view CN701 CN701 IC700 PWM IC IC700 PWM IC R745 R707 R745 R707 IC701 AMP...

Page 34: ...3 Check PVDD voltage 34 V of CN600 pin4 5 6 If PVDD voltage has 25 V under refer to SMPS board repair guide 4 Check GVDD VDD voltage 12 V of IC701 pin1 22 If GVDD VDD voltage has 8 5 V under refer to 12V no power repair guide 5 Check impedance 3 ohm of speaker unit If Impedance of speaker unit has 1 ohm under replace speaker unit 6 If check point 3 4 5 is ok replace IC701 AMP IC on MAIN top board ...

Page 35: ...ter main set power off check red LED blink at intervals of 0 5 second B Protection 2 Turn main set power on again 3 Check voltage 3 3 V of AMP_Protect signal pin2 of Q702 4 If pin2 of Q702 is low 0 V replace IC701 AMP IC on MAIN top board 6 3 3 Service hint Any picture Remark Main board top view Main board bottom view IC701 AMP IC IC701 AMP IC Q702 pin2 Q702 pin2 ...

Page 36: ...mal Is Vcc 10 V 18 V supplied to IC901 Pin7 D935 normal Replace F901 Use the same fuse Check or replace D902 Replace TH901 Replace IC941 Replace BD901 Replace D933 D934 D902 normal Replace D935 YES YES YES YES YES YES NO YES NO NO NO NO NO NO NO Power line of main PCB is short 3 19 ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 37: ...e about 2 5 V at IC951 Pin1 Replace F901 Use the same fuse Check or replace R959 R960 R961 R963 R964 Replace TH901 Replace D951 Replace BD901 Replace Q901 R959 R960 R961 R963 R964 normal Replace IC951 YES YES YES YES YES YES NO YES NO NO NO NO NO NO NO Power line of main PCB is short 3 20 ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 38: ...02 Pin2 H YES NO Check or replace IC602 No VFD YES Is the power supplied from the Pin8 Pin9 Pin10 of CN801 D801 D805 D806 normal DIGI800 Pin26 normal Check the Pin4 Pin5 Pin6 from CN503 Check or replace D801 D805 D806 Check or replace DIGI800 YES YES YES NO NO NO Check or replace VFD 3 21 ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 39: ...2 Pin2 H Check and change IC605 NO NO NO Check if IC600 have 3 3 V output X501 32 768 kHz X500 24 MHz Check the operation Check if IC605 have 1 2 V output 3 IC503 MX25L3235E CHECK CHECK IC501 OK Refer to MCS troubleshooting Replace MCS OK Check pinB12 pinB11 DATA CLK Check MCS voltage 3 3 VA Check MCS NO NO NO YES YES YES YES ...

Page 40: ...k CN801 connection Check input data IC502 Pin F1 F2 G1 Check each Pin voltage Check MCS_MCLK output data IC502 Pin D2 Replace IC502 OK OK Refer to SMPS troubleshooting Check CN801 Pin8 9 10 input voltage Check DC DC power L614 VCC_5 1V F L611 12VA VIN L607 VCC_3 3V VDD Check IC502 CN801 pin4 5 6 data communication CLK STB DATA Check IC501 NO NO NO NO YES YES YES YES YES YES YES YES YES YES YES YES...

Page 41: ..._MCLK output data IC502 Pin D2 OK OK OK Check IC701 Pin21 CLK input Refer to SMPS and DC DC convertor troubleshooting Check L605 PWM_3 3V Check X701 12 288 MHz operation Check X701 12 288 MHz Check IC502 Check Data communication Pin24 25 Check IC701 input data Check IC701 Check IC502 MLC3730S Pin B3 PWM_RST Pin A1 PWM_DATA Pin A2 PWM_CLK output Check IC701 TAS5548 input data Pin24 PWM wave Check P...

Page 42: ...HECK OK Refer to SMPS troubleshooting Check each line resistor output voltage Replace the coil Check IC701 Pin1 2 8 13 22 input voltage Check PWM Modulator input IC701 Pin5 6 14 15 Check IC701 IC702 Pin27 28 32 NO NO NO Check CN600 Pin4 5 6 34 V L611 12 V Check IC701 Pin2 12 V input Check output line coil ...

Page 43: ...in42 SLCK Pin43 LRCK Pin44 MCLK Replace IC202 IC502 MLC3730 output data Check JK201 IC200 OK Check IC202 CS5346 Pin11 12 26 27 input Check IC202 CS5346 Pin41 output data Check IC502 MLC3730 input data Check IC202 Pin5 3 3 V Pin14 5 V Check IC202 Pin5 3 3 V Pin6 High Pin14 5 V NO NO NO NO NO YES YES YES YES YES YES YES YES OK ...

Page 44: ...tenna cable insert again Check or replace IC200 Check or L604 VCC_3 3 V Check or replace IC502 Check tuner IC200 Pin11 VCC_3 3V Check IC200 Pin5 6 7 8 RST CS SCLK SDIO X200 32 768 kHz Check opration Check JK200 Antenna input cable insert Check IC200 Pin13 14 Tuner output NO NO NO NO NO YES YES YES YES YES YES OK ...

Page 45: ...up IM driving Focus and tracking is ok Check Vcc of IC401 Replace IC502 Check Cristal X400 Is Motor ok about 12 Ω Is no signal at spk Can the disc insert Disc reading is ok Check the signal of IC407 Pin52 53 54 Check IC502 input output and control line Check the signal 16 0344 MHz at IC401 Pin51 Focus tracking sled signal is ok Is load ok NO NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YES ...

Page 46: ...heck USB jack CN802 Replace IC502 Check L617 USB_5 V Check IC502 Pin A7 A8 Display NO FILE Display READ Plug in USB device Display NO USB Check USB_D D CN802 Pin2 3 Check USB_5V NO NO NO NO YES YES YES YES YES YES YES Check USB audio file in USB device MP3 WMA file is playable ...

Page 47: ...1 IC502 pin38 2 IC502 pin53 3 IC502 pin35 4 IC503 pin1 3 AUDIO PATH CD_BCK CD_LRCK CD_DATA DAC_MCLK DAC_BCK DAC_LRCK DAC_DATA 9 IC501 pin D2 10 IC501 pin E1 11 IC501 pin D1 12 IC501 pin E2 6 IC501 pin N4 7 IC501 pin N1 8 IC501 pin N2 8 7 6 9 10 11 12 4 USB USB_5V D D 13 IC501 pin A8 14 IC501 pin A7 14 13 ...

Page 48: ...3 32 3 31 1 Total CNT 7 ea 1 FFC Cable MAIN MAIN ȧ BT Module 1EA MAIN ȧ MD 2EA 2 Harness Single MAIN ർ SMPS 1EA MAIN ȧ FRONT 1EA MAIN ȧ JACK 1EA JACK ȧ LED 1EA WIRING DIAGRAM ...

Page 49: ...3 34 3 33 BLOCK DIAGRAMS 1 SYSTEM BLOCK DIAGRAM ...

Page 50: ...3 36 3 35 DS 3KRWR RXSOHU 1 6KXQW 5HJ DS ĞĞĚďĂĐŬ Ws 1RLVH LOWHU ORFN 6QXEEHU ORFN 0DLQ 6036 LWK 7 ORFN 7 5 1 6 S J 6 WͲ d ORFN DS LQH LOWHU 8 6 2 SMPS BLOCK DIAGRAM ...

Page 51: ...3 38 3 37 3 AUDIO PATH BLOCK DIAGRAM ...

Page 52: ...3 40 3 39 4 POWER BLOCK DIAGRAM ...

Page 53: ...R TI GVDD 10 8 13 2 V VDD 2 PVDD 12 34 V GVDD 1 22 Measured Voltage PVDD 29 30 31 VDD 12 46 V 36 37 38 GVDD 12 4 V PVDD 34 77 V Location No Specification Test V SMPS Board Primary Side AC in 230 V 50 Hz C902 100 uF 460 V 317 Secondary Side Standby Power On C907 100 uF 50 V 11 8 20 1 C909 22 uF 50 V 10 8 18 7 C951 1000 uF 50 V 2 044 34 78 C952 1000 uF 50 V 2 044 34 78 C955 1 uF 50 V 10 47 24 75 Loc...

Page 54: ...3 62 3 61 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 55: ...3 64 3 63 2 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 56: ...3 66 3 65 3 FRONT P C BOARD TOP VIEW BOTTOM VIEW ...

Page 57: ...3 68 3 67 4 JACK P C BOARD 5 SPEAKER LED DISPLAY P C BOARD TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 58: ...3 70 3 69 ...

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