LG CM9550 Service Manual Download Page 42

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3-21

< Signal check point >

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output in the BLUETOOTH FUNCTION, repair the set according to the
following guide.

6-6. IN THE BLUETOOTH FUNCTION

6-6-1. Solution

Please check and replace IC501 on MAIN board and Bluetooth module on front panel.

6-6-2. How to troubleshoot (Countermeasure)

1) Check BT_RX, BT_TX signal to Pin4, 6 of CN504.



If no signal, check the signal to Pin4, 6 and Pin10(3.3 V) of on the Bluetooth module and cable connection state.



If there are no signal out from module, replace new module.

2) Check if BT_RX/TX is entered from Pin4, 6 of CN504 to Pin PGPB10, PGPB11 to IC501 (DSP).
3) Check if MCS_BCK, MCS_LRCK is entered from IC501 to IC600.



If no signal, check VCC12(+1.2 V) for IC501. If it is abnormal, change replace it a new one.

4) Check the following I2S signal flow from IC501 to IC600.



If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.



If AMP is damaged, replace it with a new one.

6-6-3. Service hint (Any picture / Remark)

< BLUETOOTH function signal

ow >

MLC3730

MCS LOGIC

TAS5548

PWM

FL±

RL±

DRIVER
IRS2092
(x 4 EA)

32.768 KHz

MIC_O_DATA0

(+3.3 V)

(+3.3 V_CD, VCC 1.2)

12.288 MHz

FR ±

RR ±

DAC IC
AZ4580

FET

IRF6775
(x 12EA)

SW1

SW2

SW1

SW2

PWM_MCK/BCK/

LRCK

AMP_OSC

MIC CODEC

ADC CODEC

24 MHz

FL1

FL2

BT_RX, BT_CTS

Summary of Contents for CM9550

Page 1: ... CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL Internal Use Only APRIL 2016 P NO AFN77483233 MODEL CM9550 CM9550 NS9550F W MODEL CM9550 CM9550 NS9550F W Mini Hi Fi System ...

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 12 1 2 ...

Page 4: ...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 swab...

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: ... 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 materia...

Page 7: ...ROM Option by SKIP 3 Clear EEPROM Front Key STOP RCU Key SKIP 4 Edit EEPROM Front Key STOP RCU Key SKIP 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 STOP RCU Key PROGRAM Bluetooth model only 6 Power Disc Lock On Off CD Function Only Active Front Key STOP RCU Key EQ 7 Amp Clip On Off Front Key STOP RCU Key Mute Amp Clip Mode Chang...

Page 8: ...tus too This is an example Remote control Front STOP push same timing during 5 seconds FLD op0 Move to appropriate position and make changes with remote control REPEAT Press STOP key FLD WRITE OK Remote control Front STOP push same timing FLD e2p clr Completed 1 7 SERVICE INFORMATION FOR EEPROM ...

Page 9: ...he file to your set Downloading file proceeds in the same way at USB1 function and USB2 function 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 MICOM UP FINISH Auto POWER OFF 1 ...

Page 10: ...hen download the file to your set Downloading file proceeds in the same way at USB1 function and USB2 function 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 MCS UP FINISH Auto ...

Page 11: ...wnload the file to your set Downloading file proceeds in the same way at USB1 function and USB2 function 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 DEMO UP FINISH Auto POWER...

Page 12: ...nload the file to your set Downloading file proceeds in the same way at USB1 function and USB2 function 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 EQ UP FINISH Auto POWER OF...

Page 13: ...CD Frequency Response 40 to 20 000 Hz Signal to noise ratio 75 dB Dynamic range 80 dB AMPLIFIER Total output 2800 W Front 470 W x 2 6 Ω at 1 kHz Surround 470 W x 2 6 Ω at 1 kHz Subwoofer 460 W x 2 6 Ω at 60 Hz THD 20 FRONT SPEAKER Type 2 Way 2 Speaker Impedance 6 Ω Rated Input Power 470 W Max Input power 940 W SURROUND SPEAKER Type 1 Way 1 speaker Impedance 6 Ω Rated Input Power 470 W Max Input po...

Page 14: ...SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 3 1 CABINET AND MAIN FRAME SECTION CM9550 2 3 2 MECHANISM DECK SECTION DP17TM2 2 5 3 PACKING ACCESSORY SECTION 2 7 4 SPEAKER SECTION 2 8 2 1 ...

Page 15: ...2 2 ...

Page 16: ...43 252 251 252 253 A42 A47 443 443 443 268 270 269 300 272 271 443 443 443 443 443 F B T A52 CABLE4 A44 259 K MIC PTB 443 CABLE3 G H I J CABLE1 CABLE2 291 NFC Tag A56 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 17: ...2 MECHANISM DECK SECTION DP17TM2 1026 1439 A001 1002 1005 1001 1049 1437 1437 1024 1024 1030 1024 1043 1045 A005 A006 1016 1013 1015 1020 1024 1003 1439 1018 1019 1011 1012 1437 1004 ...

Page 18: ...anual 804 Bag 802 Box 808 Battery 900 Remote Control 825 FM Wire Antenna 803 Packing 803 Packing 836A Rubber Foot Rear 836L Rubber Foot Left 836R Rubber Foot Right 826 Filter Ferrite Core 3 PACKING ACCESSORY SECTION ...

Page 19: ...LED SUB LED MAIN A60L A61 A62 651 652 4 SPEAKER SECTION 4 1 FRONT SPEAKER NS9550F LEFT SPEAKER ...

Page 20: ...LED SUB LED MAIN A60R A61 A62 651 652 FRONT SPEAKER NS9550F RIGHT SPEAKER ...

Page 21: ...LED SUB LED MAIN A91 A90 952 952 A92 951 4 2 SUBWOOFER SPEAKER NS9550W ...

Page 22: ... CIRCUIT DIAGRAM 3 49 2 SMPS POWER 2 CIRCUIT DIAGRAM 3 51 3 MAIN CD DSP CIRCUIT DIAGRAM 3 53 4 MAIN RF SERVO CIRCUIT DIAGRAM 3 55 5 MAIN ADC PWM CIRCUIT DIAGRAM 3 57 6 MAIN AMP CIRCUIT DIAGRAM 3 59 7 FRONT VOLUME CIRCUIT DIAGRAM 3 61 8 MIC PORTABLE CIRCUIT DIAGRAM 3 63 9 FRONT SPEAKER MAIN CIRCUIT DIAGRAM 3 65 10 FRONT SPEAKER SUB CIRCUIT DIAGRAM 3 67 11 WOOFER SPEAKER MAIN CIRCUIT DIAGRAM 3 69 12...

Page 23: ...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 TH900 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 TH900 TH901 If TH900 TH901 is open replace it with a new o...

Page 24: ...heck if the fuse F901 is open or short circuit 2 Check the Drain Source or Drain Gate Gate Source Resistance of Q905 Q906 with a digital multi meter If it is short condition it s destroyed Replace it with a new one Please replace 2 FET at the same time although several FET is OK 1 2 3 Service hint Any picture Remark F911 If F911 is not short circuit replace it with a same specifications one Q905 Q...

Page 25: ...d DVCC 3 3 V IC505 in standby mode If there is no 5 6 VA check the SMPS and if doesn t appear 3 3 V check IC505 2 Check 5 6 VA 12 V FL FL an 39 V 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 the IC501 with a new one on the main board 2 1 3 Service...

Page 26: ...racters on VFD are not displayed 3 1 VFD DIG300 3 1 1 Solution Please check and replace DIG300 on FRONT board 3 1 2 How to troubleshoot Countermeasure 1 Check if 39V FL and FL are output from SMPS to VFD via the main board 2 Check if the IC501 outputs VFD_RST VFD_CLK VFD_CS and VFD_DO to the front board 3 1 3 Service hint Any picture Remark ...

Page 27: ...C505 pin3 on MAIN board If IC505 pin3 about 4 9 V D500 Input 5 6 VA doesn t come out check 5 6 VA from SMPS board 2 If IC505 pin3 about 4 9 V is normal check the PWR_CTRL IC505 pin2 is high about 3 3 V If PWR_CTRL isn t high check pinB2 of IC501 R524 R5F7 3 If PWR_CTRL is high check R5F6 R5F4 R5F5 and if there s no defective component then replace IC505 4 If 3 3 V VCC33 is normal check 1 2 V outpu...

Page 28: ...ace X500 on MAIN board 4 2 2 How to troubleshoot Countermeasure 1 If 3 3 V 1 2 V is normal check Reset High of IC501 pinT12 on MAIN board If MAIN_RESET isn t high check MICOM IC101 pin40 2 If MAIN_RESET is high check the soldering status of 24 MHz crystal X500 3 If the crystal X500 doesn t oscillate check R508 R509 C502 C503 around crystal X500 If there s no defective component then replace X500 4...

Page 29: ...3 2 How to troubleshoot Countermeasure 1 If the crystal X500 does oscillate check serial flash IC503 on MAIN board Check pin8 VCC pin6 CLK pin1 CS pin2 DO pin5 DI of below waveform 2 If pin1 2 5 6 8 doesn t come out check damping resistor R564 R563 R535 R536 R534 of IC503 If damping resistor of IC503 is OK then replace IC503 it need to download program 3 After change IC503 if it is still not below...

Page 30: ...502 on MAIN board 4 4 2 How to troubleshoot Countermeasure 1 Check below waveform soldering status of SDRAM IC502 on MAIN board If pin17 CAS pin18 RAS pin19 CS pin38 CLK pin29 address pin2 DQ doesn t come out check damping resistor R568 R506 R570 R544 R547 2 If resistor is OK then replace IC502 SDRAM 3 After change IC502 if it is still not below waveform check IC501 DSP IC 4 4 3 Service hint Any p...

Page 31: ... IC501 4 5 1 Solution Please check and replace IC501 MLC3730 on MAIN board 4 5 2 How to troubleshoot Countermeasure 1 After check them by previous pages about no booting if the set is still no booting Check soldering status of IC501 2 If below bootstrap waveform doesn t come out then replace IC501 DSP IC 4 5 3 Service hint Any picture Remark R594 PGPB12 Yellow R598 PAD19 Green R597 PAD20 Pink R597...

Page 32: ...sure 1 Check the SPDO signal from Pin16 of IC407 If no signal check 3 3 V RF and X400 2 Check the SP SP from IC408 to CN405 for driving SPINDLE motor It is about 3 6 Vp p If no signal check 1 8 V and 5 V for IC408 3 Check if the FFC cable is solidly connected between CN405 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 func...

Page 33: ...eck the SLDO signal from Pin23 of IC407 If no signal check 3 3 V RF and X400 2 Check the SLED SLED from IC408 to CN405 for driving SPINDLE motor It is about 2 9 Vp p If no signal check 1 8 V and 5 V for IC408 3 Check if the FFC cable is solidly connected between CN405 and MD 4 Check the MD If the sled motor is sort circuit or has any trouble it can not move the pick up module Please check the func...

Page 34: ...eck 1 8 V 5 V to IC408 2 Check LOAD from IC408 to CN405 for driving the tray open close motor It is about 3 85 Vp p If no signal check 5 V to IC408 If it has any trouble replace it with a new one 3 Check if the FFC cable is solidly connected between CN405 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 cha...

Page 35: ...m be positioned in the center of a track on CD disc 1 Check the TRD signal from Pin22 of IC407 If no signal check 3 3 V RF and X400 2 Check TR TR from IC408 to CN404 for driving the tracking actuator If no signal check 1 8 V and 5 V for IC408 3 Check if the FFC cable is solidly connected between CN404 and MD 4 Check the MD If the pick up module has any trouble it can not move the laser beam on the...

Page 36: ...eam keep a regular interval with the surface of a CD disc 1 Check the FOD signal from Pin21 of IC407 If no signal check 3 3 V RF and X400 2 Check F F from IC408 to CN404 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 CN404 and MD 4 Check the MD If the pick up module has any trouble it can not move the laser beam on...

Page 37: ...0 USB function signal flow LC78615ERF SERVO USB_HUB_DP DN CS5346 MLC3730 MCS LOGIC EN ADC_DATA DAC_MCLK BCK LRCK PT_L R AUX_L R AUX USB1 Portable CD_DIN_DOUT CD_R W BUSY CD_16 M SUBSYQ CD_RST CD_MCK BCK LRCK DATA TUNER_L R USB2 TUNER TAS5548 PWM FL RL DRIVER IRS2092 x 4 EA Front 470 W X 2 ea Woofer 460 W X 2 ea Front1 470 W X 2 ea 16 9344 MHz CS MCU_RST X RX MIC_O_DATA0 3 3 V 3 3 V_CD VCC 1 2 3 3 ...

Page 38: ...C202 If is NG replace it a new one 4 Check the following I2S signal flow from IC501 to IC600 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 If AMP is damaged replace it with a new one 6 2 3 Service hint Any picture Remark IC202 PT_L to pin...

Page 39: ...1 If no signal check 5 V 3 3 V ADC for IC202 If is NG replace it a new one 6 Check the following I2S signal flow from IC501 to IC600 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 7 Check if the digital audio AMP block is okay Refer to Digital Audio AMP guide If AMP is damaged replace ...

Page 40: ...ATA is entered from IC202 to IC501 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 audio signal flow from IC501 to IC600 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 Aud...

Page 41: ... Check if ADC_DATA is entered from IC202 to IC501 If no signal check 5 V 3 3 V ADC for IC202 If is NG replace it a new one 6 Check the following I2S audio signal flow from IC501 to IC600 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 7 Check if the digital audio AMP block is okay Refer...

Page 42: ...501 DSP 3 Check if MCS_BCK MCS_LRCK is entered from IC501 to IC600 If no signal check VCC12 1 2 V for IC501 If it is abnormal change replace it a new one 4 Check the following I2S signal flow from IC501 to IC600 If there is any trouble check the power for each IC If the signals are abnormal replace it a new one 5 Check if the digital audio AMP block is okay Refer to Digital Audio AMP guide If AMP ...

Page 43: ...ubleshoot Countermeasure 1 Please check if this system is on bass blast mode C RL and RR make sound only on bass blast mode 2 Check the IC700 IC705 on your eyes 3 Check the audio signal output check Pin13 of IC700 IC705 First check the Audio Data input Pin3 of IC700 IC705 4 If the audio signal output has no output try to change IC which has no output 5 Lastly check Speaker Terminal TM701 TM702 7 1...

Page 44: ... when DC protection is detected Main reasons are like below When Some of AMP FETs dead 8 1 3 Service hint Any picture Remark AMP FET IRF6775 Notice for FET service In case of RF6775 Metal case FET Drain has electric potential So be careful when you deal with it You can see FET after removing heatsink Notice for Service Before repair Main Assy you need to discharge SMPS After then open the connecto...

Page 45: ... supply voltage of AMP CN110 PWM signal Normal Supply voltage and signal Check AMP IC Poor supply voltage Check SMPS Assy Poor signal Check PWM IC 2 Check CSD of FET driver IC IRS2092 EAN60778301 CSD has about 5 V on normal state When AMP has problem CSD is LOW state or keep change LOW to HIGH 9 1 3 Service hint Any picture Remark CN110 PIN1 2 66 V PIN3 4 PGND PIN5 6 66 V 5 PIN of IC CSD ...

Page 46: ...lace F901 same fuse Check or replace D962 D963 D960 D961 normal Replace BD901 Check P_CTL from μ com Check and replace IC951 Or check line of MAIN PCB is short or not Check or replace D960 D961 NO NO NO NO NO F901 normal Is the VCC 13 VA supplied to IC951 Pin1 Is the VCC 11 V 25 V supplied to IC901 Pin4 BD901 normal Is there H signal at IC951 Pin4 ...

Page 47: ...RONT PCB is short or not NO NO NO R968 normal ZD951 ZD952 normal D957 D959 normal No 5 V Check or replace R965 D959 Check P_CTL from μ com Check or replace Q953 Q957 Or check line of MAIN PCB is short or not Check or replace Q951 Is the VCC 7 VA supplied to IC953 Pin2 Is there H signal at Q953 Base NO NO NO R965 normal YES YES YES ...

Page 48: ...HOOTING GUIDE No output AMP gate line Check or replace R952 Check or replace D951 D952 Check and replace IC952 Or check line of MAIN PCB is short or not Is the VCC 13 VA supplied to IC952 Pin1 to Pin3 NO NO R952 normal YES YES ...

Page 49: ... Q907 Q910 Check or replace IC902 and check Q911 Q914 gate Pin2 components Resistors Diodes Q911 Q914 OK Replace Q911 Q914 Check or replace D953 D956 Check line of MAIN PCB is short or not Is the C904 C905 voltage about 380 V F911 normal PFC P CTL OK AMP P CTL OK Is the VCC 12 V supplied to IC904 Pin16 Is the VCC 12 V supplied to IC902 Pin8 NO YES NO NO NO NO YES NO YES YES YES YES NO NO ...

Page 50: ...1 303 304 grid voltage OK Replace LED LD3V09 LD3V24 Check MAIN board HELLO Display on FLD OK Volume LED LD3V31 LD3V40 LD3V42 LD3V49 turn on When turn the volume count is change NO NO NO NO NO NO NO NO NO NO CN301 cable connection OK Q301 Q303 Q304 grid voltage OK CN3V01 Pin8 9 12 V OK CN3V01 pin31 32 signal OK CN301 Pin9 11 data signal OK CN301 Pin1 3 5 power OK YES YES YES YES YES YES YES YES YES...

Page 51: ...Check Loading motor Check IC501 OPU driving Focusing Tracking OK Check OPU Pick up module Is motor impedance about 12 Ω IC407 Pin51 52 53 I2S output signal OK Can disc insert IC501 Pin N1 N2 N4 I2S input signal OK Disc reading OK NO NO NO NO NO NO NO NO NO IC407 RF Servo signal OK Focusing Tracking Sled signal OK LOAD OK YES YES YES YES YES NO YES YES YES A 3 NO AUDIO PART ...

Page 52: ...0 USB power 5 VU OK YES A A When insert USB IC501 PinU7 U8 A7 A8 USB_D signal OK NO YES YES YES YES AUX Check audio cable Replace IC202 Check IC501 NO NO NO IC202 Pin7 8 AUX input signal OK IC202 Pin41 ADC MIC_data output signal OK IC202 Pin42 43 44 I2S input signal OK ...

Page 53: ...IN input signal OK IC202 Pin41 ADC MIC_data output signal OK IC202 Pin42 43 44 I2S input signal OK TUNER Check IC501 Replace IC202 Check 3 3 V of TU500 IC202 Pin42 43 44 I2S input signal OK IC202 Pin41 ADC data output signal OK NO NO NO TU500 TUNER_L R output signal OK YES A IC202 Pin23 24 TUNER_L R input signal OK NO YES YES YES ...

Page 54: ...3 33 B ELECTRICAL TROUBLESHOOTING GUIDE A YES YES YES Check IC501 Replace IC600 Check IC501 NO NO NO IC501 PinD1 D2 E1 I2S clock signal OK IC600 PWM data output signal OK IC501 PinE2 I2S data signal OK ...

Page 55: ...22 Q723 Q724 Pin28 29 35 36 of IC600 FL FR signal OK Pin13 of IC700 IC701 IC704 IC705 FL FR audio signal OK IC601 602 FL FR audio signal OK 40 V 28 V 5 V power voltage OK Q700 Q701 Q702 Q703 Q714 Q716 Q719 Q720 OK Pin26 27 31 32 of IC600 SWL SWR signal OK Pin13 of IC702 IC703 IC706 IC708 SWL SWR audio signal OK IC603 604 SWL SWR audio signal OK 40 V 28 V 5 V power voltage OK Q704 Q705 Q708 Q709 Q7...

Page 56: ...3 35 ELECTRICAL TROUBLESHOOTING GUIDE 4 NO LIGHTING WOOFER SPEAKER YES YES CD USB play Check IC501 Check woofer speaker Check SMPS board NO NO CNWM02 CNWS01 Pin3 4 I2C signal OK Pin1 12 V OK ...

Page 57: ...1 2 3 4 5 3 36 WAVEFORMS OF MAJOR CHECK POINT 1 WAVEFORM OF SERVO Figure 1 1 CD 16 M IC407 Pin31 Figure 1 2 SERVO FE TE FOD RF IC407 Pin61 62 63 IC408 Pin1 ...

Page 58: ...FORM OF MOTOR DRIVE Figure 2 1 SP SP for driving SPINDLE motor IC408 Pin17 18 Figure 2 2 SL SL for driving SPINDLE motor IC408 Pin11 12 SP SL SP SL Figure 2 3 LO LO for driving Tray motor IC408 Pin9 10 LO LO RED MOT_OPEN MOT_CLOSE ...

Page 59: ... WAVEFORM OF AUDIO SIGNAL Figure 3 1 IC501 Pin83 84 85 Figure 3 2 AUDIO_L R LRCK AUDIO_L DATA BCK AUDIO_R 4 WAVEFORM OF ADC 5 WAVEFORM OF USB Figure 4 ADC I2S IC202 Pin42 43 44 Figure 5 USB D D CN502 Pin1 2 Pin9 10 MCK D LRCK BCK D ...

Page 60: ...20 21 22 23 3 39 6 WAVEFORM OF CRYSTAL 7 WAVEFORM OF VFD GRID CURRENT DRIVER Figure 6 12 MHz Crystal IC501 Pin27 28 Figure 7 XI CH1 R327 TP304 CH2 Q301 Emitter XO ...

Page 61: ...3 40 ...

Page 62: ...3 41 3 42 VFD FRONT 10P 2 mm 10P 2 mm Portable MIC MIC Vol MIC Portable 10P 2 mm 10P 1 25 mm 15P 2 5 mm 6P 3 96 mm SMPS 15P 2 5 mm 6P 3 96 mm 40P 1 25 mm MD 1 MAIN FAN 40P 1 25 mm 0P 1 mm WIRING DIAGRAM ...

Page 63: ...HS01G FET 20 A 600 V 2 EA 4 5 V 39 V 12 V 5 6 VA PVDD 66 V AC FL VKK MAINSMPS IC STR 2A153 Flyback MAIN TRANS u com BT USB MPEG Motor Drive FAN LED Mic VFD PFC P CTRL 5 V PVDD 66 V GATE Half Bridge LLC TRANS AMP Gate Drive 4 2 CH 2300 W OPAMP AMP P CTRL Totem pole PFC IC R2A20112A Interleaved DCM FET 13 A 600 V 4 EA Gate Drive PFC Out 380 V On Off On Off Vcc Vcc On Off On Off R_ L R_R ...

Page 64: ...0 W X 2 ea Woofer 460 W X 2 ea Front1 470 W X 2 ea 16 9344 MHz VFD DIG301 IR Receiver LED_CTRL FILE A B SCRATCH A B FAN CTRL MIC_VOL A B Volume Key 32 768 KHz MCU_CS MCU_RST MUC_TX RX MIC_O_DATA0 3 3 V 3 3 V_UCOM 3 3 V_CD VCC 1 2 5 V 3 3 V_USB 5 V 3 3 V_ADC 3 3 V M P UP DECK MECHANISM 3 Disc 1 Disc VCC50 12 288 MHz FR RR SW DAC IC AZ4580 DAC IC AZ4580 DAC IC AZ4580 FL RL FR RR SW FET IRF6775 x 12E...

Page 65: ...0 mA 130 mA 0 mA 20 mA 20 mA 160 mA ADC IC202 CS5346 20 mA VKK FL 550 mA 1 A 287 mA Bluetooth Option 38 mA CP Chip Option 7 mA 3 3 V IC204 LDO LM37102D IC505 LDO TJ4220 IC102 RESET AZ7027 IC103 PWR SENS AZ7027 2 mA 2 mA 10 mA 3 3 V 3 2 V 80 mA USB HUB IC506 AZ1117 USB HUB 1 2 V IC101 U_COM RENESAS 22 mA 50 mA 12 V 2 A IC506 MIC PRE AMP S4308 FAN X 1 FRONT SPK LED 32EA Woofer SPK LED 68EA 100 mA 2 ...

Page 66: ...SED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmeter during Play mode CAUTION Danger if fuse is incorrectly replaced Replace only with the type identical to fus...

Page 67: ...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 NEW SERVICE LITERATURE IS PRINTED NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmeter...

Page 68: ...3 53 3 54 3 MAIN CD DSP 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 CD DSP EAX66324601 SD 01 _Rev0_1 0 2015 01 06 ...

Page 69: ...3 55 3 56 4 MAIN RF SERVO 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 RF SERVO EAX66324601 SD 02 _Rev0_1 0 2015 01 06 ...

Page 70: ...3 57 3 58 5 MAIN ADC PWM 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 ADC PWM EAX66324601 SD 03 _Rev0_1 0 2015 01 06 ...

Page 71: ...3 59 3 60 6 MAIN AMP 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 AMP EAX66324601 SD 04 _Rev0_1 0 2015 01 06 ...

Page 72: ...3 61 3 62 7 FRONT VOLUME 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 FRONT VOLUME EAX65547304 SD_Rev1_1 0 2015 07 14 ...

Page 73: ...3 63 3 64 8 MIC PORTABLE 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 MIC PORTABLE EAX65589004 SD_Rev1_1 0 2015 07 14 ...

Page 74: ...3 65 3 66 9 FRONT SPEAKER MAIN 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 FRONT SPK MAIN EAX65664101_6 1 3_F_SPK_LIGHTING_MAIN_SD 2014 01 25 ...

Page 75: ...3 67 3 68 10 FRONT SPEAKER SUB 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 FRONT SPK SUB EAX65664201_6 1 3_F_SPK_LIGHTING_SUB_SD 2014 01 25 ...

Page 76: ...3 69 3 70 11 WOOFER SPEAKER MAIN 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 WF MAIN EAX65684301_6 1 3_SPK_LED_LIGHTING_SD 2014 01 25 ...

Page 77: ...3 71 3 72 12 WOOFER SPEAKER SUB 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 WF SUB EAX65664001_6 1 3_WF_SPK_LIGHTING_SUB_SD 2014 01 25 ...

Page 78: ...5 75 65 80 C881 100uF 16V 16V 11 82 11 86 Pin No Location Pin Name Spec V Spec Range V CABLE Input Margin V CABLE Output Margin V CN106 MAIN CN901 SMPS CN106 MAIN 1 VKK 39 35 43 40 9 1 90 40 9 1 9 2 FL 7 2 na 7 65 0 45 7 65 0 45 3 FL 2 5 na 2 74 0 24 2 76 0 26 5 5V 5 4 8 5 2 5 01 0 01 5 01 0 01 7 8 9 5 6V 5 6 5 2 5 8 5 67 0 07 5 66 0 06 13 12V 12 11 13 12 0 00 11 99 0 01 14 B 66 64 68 65 8 0 20 65...

Page 79: ...3 75 3 76 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 80: ...NOTE Warning Parts that are critical with respect to risk of fire or electrical shock 2 SMPS P C BOARD BOTTOM VIEW 3 77 3 78 ...

Page 81: ...3 79 3 80 3 MAIN P C BOARD TOP VIEW ...

Page 82: ...3 81 3 82 4 MAIN P C BOARD BOTTOM VIEW ...

Page 83: ...3 83 3 84 5 FRONT VOLUME MIC PORTABLE P C BOARD TOP VIEW ...

Page 84: ...3 85 3 86 6 FRONT VOLUME MIC PORTABLE P C BOARD BOTTOM VIEW ...

Page 85: ...3 87 3 88 7 FRONT SPEAKER MAIN SUB WOOFER SPEAKER MAIN SUB P C BOARD TOP VIEW 8 FRONT SPEAKER MAIN SUB WOOFER SPEAKER MAIN SUB P C BOARD BOTTOM VIEW ...

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LG CM9550, Service Manual

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Summary of Contents for CM9550

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