LG CM2460 Service Manual Download Page 38

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3-21

ELECTRICAL TROUBLESHOOTING GUIDE

4. PWM MODULATION CHECK

PWM MODULATION PART

CHECK

• Check IC700 (PS9860) VDD 3.3 V - pin6,17, 34, 43, 52.

• Check X700 (24.576 MHz).

Replace X700 (24.576 MHz).

Check each line

resistor output.

Replace IC700.

Refer to

CD troubleshooting.

Replace R181, R182, R184.

Check IC700 pin8 SCL input.

Refer to

SMPS troubleshooting.

Check

PN200 pin8

(5.2 V)

Check

X700(24.576 MHz)

operation.

Check IC105 (MLC3730)

pin B3: RESET, pin A1: SDA

pin A2: SCL output.

Check X700

(24.576 MHz).

Check

IC700 input

data.

Check IC700.

Check

CD Assy communication

pin19, 20, 21.

Check

IC700 (PS9860) input data pin21

PWM wave.

Check

PWM modulator output

FL: pin39(-), 40(+) FR: pin41(-), 42(+).

other output

check.

Check line resistor output

RST: R184, SCL: R182,

SDA: R181.

YES

Summary of Contents for CM2460

Page 1: ... SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only JANUARY 2016 MODEL CM2460 CM2460 CMS2460F MODEL CM2460 CM2460 CMS2460F Micro Hi Fi Audio P NO AFN77360066 ...

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

Page 3: ...SECTION 1 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 SPECIFICATIONS 1 9 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: ...ontrol key to activate it for 5 seconds 1 Check Version and Option code Front Key PLAY PAUSE Remote Control Key PLAY PAUSE You can change Audio MCU Version Audio EQ Version EEPROM Option by SKIP 2 Clear EEPROM Front Key PLAY PAUSE Remote Control Key SKIP ...

Page 8: ...5 seconds Front Play Pause Remote Control Forward skip push same timing during 5 seconds FLD no disc status or PORT IN status FLD write ok FLD OP00 00 FLD E2P CLR Move to appropriate position and make changes with remote control skip sound effect stop key Completed 1 7 SERVICE INFORMATION FOR EEPROM ...

Page 9: ...mmddNo bin 2 Put upgrade file into USB root directory No other file exist on root directory 3 Change the mode to USB mode 4 It will start update process automatically with showing MCU UP on Display window 5 If the update is finished the set will turn off automatically 2 EQ Program 1 File name is EQ_PRG_CM2460_yymmdd_No_Checksum bin 2 Put upgrade file into USB root directory No other file exist on ...

Page 10: ...PORT IN 0 4 Vrms 3 5 mm stereo 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 100 W Front 50 W 6 Ω at 1 kHz 10 THD SYSTEM Frequency response 80 to 20 000 Hz Signal to noise ratio 80 dB Dynamic range 75 dB Bus Power Supply USB 5 V 500 mA FRONT SPEAKERS Type 2 Way 2 Speaker Impedance 6 Ω Rated Input Power 50 W Max Input Power 100 W Dimensions...

Page 11: ...1 10 ...

Page 12: ...SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 3 1 CABINET AND MAIN FRAME SECTION 2 3 2 PACKING ACCESSORY SECTION 2 7 3 SPEAKER SECTION 2 8 2 1 ...

Page 13: ...2 2 ...

Page 14: ...1 261 A26 520 520 251 492 253 252 492 460 453 453 453 453 453 267 266 265 266 262 520 511 453 453 453 453 453 CABLE2 CABLE1 CABLE6 CABLE8 CABLE7 270 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: ......

Page 16: ...2 PACKING ACCESSORY SECTION 801 Owner s manual 900 Remote control 808 Batteries 803 Packing Main 803 Packing Main 804 Bag 802 Box ...

Page 17: ...3 SPEAKER SECTION A60R A60L ...

Page 18: ...B FUNCTION 3 26 WAVEFORMS OF MAJOR CHECK POINT 3 27 1 SDRAM 3 27 2 SERVO 3 27 3 AUDIO PATH 3 28 4 USB 3 29 WIRING DIAGRAM 3 31 BLOCK DIAGRAMS 3 33 1 SYSTEM BLOCK DIAGRAM 3 33 2 SMPS BLOCK DIAGRAM 3 35 3 POWER BLOCK DIAGRAM 3 37 CIRCUIT DIAGRAMS 3 39 1 SMPS CIRCUIT DIAGRAM 3 39 2 MAIN POWER CIRCUIT 3 41 3 MAIN SERVO CIRCUIT DIAGRAM 3 43 4 MAIN MPEG CIRCUIT DIAGRAM 3 45 5 MAIN AUDIO CIRCUIT DIAGRAM ...

Page 19: ...al or open 1 1 3 Service hint Any picture Remark F900 If F900 is not short circuit replace it with a same specifications one TH900 If TH900 is open replace it with a new one BD900 If BD900 is short circuit replace it with a new one L N AC i n 110 240V 1 2 F900 T3 15AL 250V 1 2 PN900 VH 3Y 1 2 4 3 LF900 LF UU1005 818R 2 1 3 4 LF901 LF UU1005 818R CY902 471 250V CM901 0 1uF 275V R914 C907 0 1uF 50V ...

Page 20: ...e 1 2 3 Service hint Any picture Remark SMPS schematic diagram R924 5 1R 1206 C919 220uF 25V C918 100pF 1KV R906 200K 0 5W D906 HER103 R928 1k ZD901 15V 0 5W C922 1000uF 16V 2 4 3 1 PC900 EL817 R926 10k 1 R925 330 C924 470uF 16V D903 FR107 C926 0 1uF X7R D901 FR107 C908 22uF 50V C920 100uF 25V C906 CBB 103pF 630V R927 10K R910 2 2R 1206 FB901 BEAD L900 10uH 2A D907 SR360 3 2 1 IC902 TL431 CY905 47...

Page 21: ...asure 1 Check 5 1 V to PN200 in standby mode If there is no 5 1 V check the SMPS 2 Check 12 V 5 1 V and PVDD when power on the set If the set doesn t work regardless of what the KEY1 R131 changes high to low while pressing the power button X100 and X101 work normally but if you can not power on the set replace IC105 with a new one on the MAIN board 2 1 3 Service hint Any picture Remark Signal chec...

Page 22: ...picture Remark VOL_LDE1 1 VOL_LDE2 2 VOL_LDE3 3 LDE4 4 OSC 5 DOUT 6 DIN 7 CLK 8 STB 9 K1 10 K2 11 VDD1 13 VSS1 12 SG1 14 SG2 15 SG3 16 SG4 17 SG5 18 SG6 19 SG7 20 SG8 21 SG9 22 23 SG10 24 SG11 25 SG12 26 SG13 27 SG14 28 SG15 29 SG16 KS16 30 VEE 31 SG17 GR12 32 GR11 33 GR10 39 GR4 38 GR5 37 GR6 36 GR7 35 GR8 34 GR9 40 GR3 41 GR2 42 GR1 43 VDD IC300 44 VSS PT6315 47uF 50V C331 0 1uF C300 R301 100K C...

Page 23: ... pin16 of IC800 If no signal check 3 3 V pin63 RF and X800 2 Check the SPIN SPIN from IC801 to PN801 for driving SPINDLE motor It is about 3 6 Vp p If no signal check 5 V for IC800 3 Check if the cable is solidly connected between PN801 and MD 4 Check the MD If the spindle motor is sort circuit or has any trouble it can not rotate CD discs Please check the function after changing another MD 4 1 3 ...

Page 24: ...ermeasure 1 Check the SDOUT signal from pin15 of IC800 If no signal check 3 3 V pin63 RF and X800 2 Check the SLED SLED from IC801 to PN801 for driving SPINDLE motor It is about 2 9 Vp p If no signal check 5 V for IC801 3 Check if the cable is solidly connected between PN801 and MD 4 Check the MD If the sled motor is sort circuit or has any trouble it can not move the pickup module Please check th...

Page 25: ...5 V to IC801 2 Check LOAD from IC801 to PN802 for driving the tray open close motor It is about 3 85 Vp p If no signal check 5 V to IC801 If it has any trouble replace it with a new one 3 Check if the cable is solidly connected between PN802 and MD 4 Check the MD If the tray motor is sort circuit or has any trouble it can not open or close the tray Please check the function after changing another ...

Page 26: ...e laser beam be positioned in the center of a track on CD disc 1 Check the TDOUT signal from pin14 of IC801 If no signal check 3 3 V pin63 RF and X800 2 Check TR TR from IC801 to PN800 for driving the tracking actuator If no signal check 5 V for IC801 3 Check if the FFC cable is solidly connected between PN800 and MD 4 Check the MD If the pickup module has any trouble it can not move the laser bea...

Page 27: ...the laser beam keep a regular interval with the surface of a CD disc 1 Check the BUSY signal from pin21 of IC800 If no signal check 3 3 V pin63 RF and X800 2 Check F F from IC801 to PN800 for driving the focusing actuator If no signal check 5 V for IC801 3 Check if the FFC cable is solidly connected between PN800 and MD 4 Check the MD If the pickup module has any trouble it can not move the laser ...

Page 28: ... but if the signal waveform to the IC is distorted or no signal replace it with a new one 3 Check if Digital audio AMP block on Item 5 2 is normal 5 1 3 Service hint Any picture Remark MCS_MCLK 16 93 MHz MCS_BCK 1 4 MHz MCS_ADAT_OUT MCS_LRCK 44 1 kHz M P UP PWM 0 6 8 9 S P TAS5612LA FR FL Z H M 6 7 7 5 4 2 IC800 BU9546 DSP IC105 MLC3730 176PIN BGA Interrupt controller CDROM x8 speed Decoder NAND C...

Page 29: ...nal 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 a All the powers are normal but if 12 V is low there is possible for AMP IC to be damaged b Remove L701 L702 L703 and L704 one by 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 Check the impedance between IC70...

Page 30: ...t with a new one 3 Check if Digital audio AMP block on item 5 2 is normal 5 3 3 Service hint Any picture Remark D to pin2of CN301 D to pin3of CN301 PWM 0 6 8 9 S P TAS5612LA FR FL Z H M 6 7 5 4 2 DSP IC105 MLC3730S 176PIN BGA USB1_D USB2_D Interrupt controller CDROM x8 speed Decoder NAND Controller within BCH codec 14bits ECC GDMA 3ch ADC 12bit 5ch Timer Watchdog GPIO 72 Max SPI 4ch Max RTC Wake u...

Page 31: ...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 Audio AMP guide on Item 5 2 If AMP is damaged replace it with a new one 5 4 3 Service hint Any picture Remark PWM PS9860 TAS5612L FR FL Z H M 6 7 5 4 2 DSP IC105 MLC3730S 176PIN BGA IC403 CD4052 AUX AUX_L R Interrupt controller CDR...

Page 32: ...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 Audio AMP guide on Item 5 2 If AMP is damaged replace it with a new one 5 5 3 Service hint Any picture Remark PWM PS9860 TAS5612L FR FL Z H M 6 7 5 4 2 DSP IC105 M...

Page 33: ...NO TH900 normal Replace TH900 YES NO Is Vcc 10 V 18 V supplied to IC904 pin3 D903 normal YES NO Check or replace D903 Is there about 2 5 V at IC902 pin1 Replace IC902 YES NO D907 normal Replace D907 YES NO D906 normal Replace D906 YES NO Power line of main PCB is short NO 3 16 ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 34: ...14 V 26 V supplied to IC901 pin6 D903 normal YES NO Check or replace D903 Check P_CTRL HIGH signal from MCS Check PC902 IC901 normal Replace IC901 Check or replace Q901 YES NO D908 normal Replace D908 YES NO Is there about 2 5 V at IC903 pin1 Replace IC903 YES NO Q901 base HIGH Power line of main PCB is short NO NO 3 17 ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 35: ...signal from MCS YES NO Check or replace Q905 No VFD Is VFD 5 V supplied to PN100 pin1 YES YES D301 normal D302 normal Q301 Q303 Q305 Q306 normal Check or replace D301 Check or replace D302 Check or replace Q301 Q303 Q305 Q306 YES YES YES NO NO NO Check or replace VFD 3 18 ELECTRICAL TROUBLESHOOTING GUIDE ...

Page 36: ...S YES YES MCS PART CHECK OK Refer to SMPS troubleshooting Check and change IC204 X100 32 768 kHz X101 24 MHz Check the operation Check and change IC203 NO NO NO Check if voltage of PN200 pin8 is 5 2 V Check if IC204 have 1 2 V output Check if IC203 have 3 3 V output ...

Page 37: ...Replace IC300 FLD light on OK OK Refer to SMPS MPEG troubleshooting Check PN100 pin1 input voltage 5 V Check D301 input votltage 5 V Check T300 pin6 7 Output votltage AC 2 6 V Check D302 pin1 Output votltage 27 V Check IC300 PT6315 voltage pin30 VKK 27 V pin13 43 3 3 V Check IC300 data communication STB DATA CLK Check IC300 Check IC300 Check input data PN100 pin6 7 8 NO NO NO NO NO NO NO NO YES YE...

Page 38: ...SCL input Refer to SMPS troubleshooting Check PN200 pin8 5 2 V Check X700 24 576 MHz operation Check IC105 MLC3730 pin B3 RESET pin A1 SDA pin A2 SCL output Check X700 24 576 MHz Check IC700 input data Check IC700 Check CD Assy communication pin19 20 21 Check IC700 PS9860 input data pin21 PWM wave Check PWM modulator output FL pin39 40 FR pin41 42 other output check Check line resistor output RST ...

Page 39: ...Refer to SMPS troubleshooting Check each line resistor output voltage Replace the coil Check IC701 pin29 30 31 36 37 38 input voltage 24 5 V Check PWM Modulator input IC701 pin5 6 14 15 Check IC701 pin27 28 32 35 39 40 NO NO NO Check PN200 pin7 12 V pin1 2 24 5 V Check IC701 pin2 12 V input Check output line coil ...

Page 40: ...pin11 MCLK pin12 SLCK Replace IC400 Check IC400 pin6 7 3 3 V Replace IC401 IC401 pin1 7 output data IC105 MLC3730 output data Check CON105 IC402 Check IC403 BU4052 pin5 14 AUX pin1 12 TUNER input Check IC403 BU4052 pin3 13 output data Check IC400 CJC5357 input data Check IC403 pin16 12 V NO NO NO NO NO YES YES YES YES YES YES YES YES OK ...

Page 41: ...ING GUIDE 7 TUNER FUNCTION CHECK TUNER FUNCTION CHECK IC105 MLC3730 output data Check Q204 Input voltage 5 1 V Replace Q204 OK Check IC402 pin11 3 3 V Check IC402 pin8 SDA pin7 SCL NO NO YES YES YES YES YES Refer to function check ...

Page 42: ... IM driving Focus and tracking is ok Check Vcc of IC800 Replace IC105 Check Cristal X800 Is Motor ok about 12 Ω Is no signal at spk Can the disc insert Disc reading is ok Check the signal of IC800 pin34 35 36 Check IC105 input output and control line Check the signal 16 934 MHz at IC800 pin48 49 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 43: ...ON Check USB jack JK300 Replace IC105 Check CN301 Check IC105 pin U7 U8 Display NO FILE Check USB_5V Display READ Plug in USB device Display NO USB Check USB_D D L303 L306 NO NO NO NO YES YES YES YES YES YES YES Check USB audio file in USB device MP3 WMA file is playable ...

Page 44: ...3 27 WAVEFORMS OF MAJOR CHECK POINT 1 SDRAM 2 SERVO CLK DATA ADDRESS CS CD 16M 2 3 4 1 5 2 1 3 4 5 Figure 2 Figure 1 ...

Page 45: ...3 28 3 AUDIO PATH CD_BCK CD_LRCK CD_DATA DAC_MCLK DAC_BCK DAC_LRCK DAC_DATA Figure 3 1 Figure 3 2 8 7 6 9 10 11 12 9 11 10 12 7 6 8 ...

Page 46: ...3 29 13 14 4 USB USB_5V D D Figure 4 14 13 ...

Page 47: ...3 30 ...

Page 48: ... 3 31 AC IN Display PCB SMPS PCB MAIN PCB KEY PCB BT module AC IN DA11VP_SLM M CD Pickup VFD Port plug Display plug SPK jack FM ANT SMPS plug BT plug USB plug motor plug CD Pickup KEY VOL IR WIRING DIAGRAM ...

Page 49: ...4 V 16 9344 MHz DA11VZ_SLM Taiyo M CD5888 MOTOR DRIVER A B C D E F PD LD MD SWITCH SERVO BU9546 ROHM M LIMIT SW SP SP SL SL F F T T TRACK SPINDLE HEF4052 TUNER Si4702 Ant SUBSYQ BUSY CD RW DI DO RESET SLEGP FOCUS IIC APS2401 3 3V IIS 3 3 V TG1103 5 2 V 3 3 V 12 V M OP CL SW LOAD 12 V R L 24 MHz Portable In R L D4558 32 768 kHz MPEG Main chip IC MLC3730S 176PIN BGA SPI IIC FLASH 8 Mbit APS2401 1 2V...

Page 50: ...3 36 3 35 POWER IC OB2358 PWM IC OB5269 1 EMI 2 EMI FUSE 3 15 A VCC VCC 24 V 3 5 A 5 2 V 1 5 A 12 V 500 mA AC IN 110 V 240 V 10 6 A 100 uF 450 V 22 uF 450 V EEL22 ERL2834 2 SMPS BLOCK DIAGRAM ...

Page 51: ... mA IC105 MCS MLC3730 IC103 SDRAM M12L64164A 15 mA IC104 RESET AZ7027 2 mA IC201 RESET AZ7027 2 mA IC102 FLASH 16 MB 20 mA IC101 FLASH 1 MB 2 mA BT100 BULETOOTH MB8811C0 38 mA PWR_CTRL IC402 TUNER SI4702 30 mA 3 3V_VCC1 IC700 PWM PS9860 60 mA IC800 SERVO BU9546 30 mA 205 mA VFD_CTRL VFD FL VKK VFD_CTRL MUTE IC403 FUNC HEF4052 IC701 AMP TAS5612LA IC401 AMP D4558 12 mA 130 mA 25 mA LDO IC803 APS2401...

Page 52: ...est value 61 C VDD 3 29 V Location Value uF Voltage_Spec 288 V 50 Hz voltage C190 470 uF 10 V 3 21 V C194 4 7 uF 50 V 11 8 V C195 47 uF 25 V 11 8 V C196 47 uF 25 V 12 1 V C1A1 220 uF 10 V 3 277 V C1B10 220 uF 10 V 4 6 V C1B8 220 uF 10 V 4 15 V C1C1 1000 uF 10 V 3 29 V C1C2 220 uF 10 V 4 15 V C200 220 uF 10 V 4 88 V C207 47 uF 16 V 4 95 V C210 470 uF 10 V 4 86 V C225 1000 uF 10 V 3 29 V C235 4 7 uF...

Page 53: ...3 56 3 55 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD TOP VIEW NOTE Warning Parts that are critical with respect to risk of fire or electrical shock ...

Page 54: ...3 58 3 57 SMPS P C BOARD BOTTOM VIEW ...

Page 55: ...3 60 3 59 2 MAIN P C BOARD TOP VIEW ...

Page 56: ...3 62 3 61 MAIN P C BOARD BOTTOM VIEW ...

Page 57: ...3 64 3 63 3 DISPLAY P C BOARD TOP VIEW ...

Page 58: ...3 66 3 65 DISPLAY P C BOARD BOTTOM VIEW ...

Page 59: ...3 68 3 67 4 KEY P C BOARD TOP VIEW BOTTOM VIEW ...

Page 60: ...3 70 3 69 ...

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LG CM2460, Service Manual

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