LG CM4750, CMS4750F Service manual

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SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.

SERVICE MANUAL

Internal Use Only

Website http://biz.lgservice.com

AUGUST, 2015P/NO : AFN77277047

MODEL:

CM4750

(CM4750, CMS4750F/W)

MODEL: CM4750 (CM4750, CMS4750F/W)

Mini Hi-Fi System

CONTENTS

SECTION 1 ........ GENERAL

SECTION 2 ........ CABINET & MAIN CHASSIS

SECTION 3 ........ ELECTRICAL

SECTION 4 ........ REPLACEMENT PARTS LIST

1-1

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

1. MCS PROGRAM ....................................................................................................................................... 1-8

2. EQ PROGRAM ......................................................................................................................................... 1-9

SPECIFICATIONS ..................................................................................................................................... 1-10

1-2

SERVICING PRECAUTIONS

NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

Storage in conductive bag

Drop impact

2. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage 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.

NEVER look directly at the laser beam, and don’t allow contact with fingers or other exposed skin.

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 cotton swab should be used, taking care not to distort lens.

Pressure

Magnet

How to hold the pick-up

Cotton swab

Conductive Sheet

6) Never attempt to disassemble the pick-up. Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

1-3

Pressure

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must be taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magnetism is present, or where there is excessive dust.

2. Notes for repair

1) Before 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 AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1 M)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Armband

Resistor (1 M)

Conductive Sheet

1-4

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.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can

generate electrical charges 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 comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER

SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

1-5

HIDDEN KEY MODE

Push both Front key and RCU key to activate it for 5 seconds.

1. Disc Lock On/Off (CD Function Only Active)

 Front Key : STOP  RCU Key : STOP

2. Check Version and Option code

 Front Key : STOP  RCU Key : PLAY/PAUSE  You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM 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 Change (Amp Clip On --> Amp Clip Off --> Level Down display).

1-6

SERVICE INFORMATION FOR EEPROM

POWER ON

FLD no disc status or AUX status.

Remote control ‘Fwd skip’ + Front ‘STOP’ push same

timing during 5 seconds.

FLD ‘OP-0….

Move to appropriate position and make changes with

remote control ‘skip, mode, play’ key.

Press ENTER key

FLD ‘write ok’

Remote control ‘Fwd skip’ +

Front ‘STOP’ push same timing

FLD ‘E2P CLR’

Completed

1-7

PROGRAM DOWNLOAD & UPDATE GUIDE

1. MCS PROGRAM

Download program file name must be

- HG520_FW_CM4750_DATE.bin

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage

device and disable the security 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.



FIRMWARE



FINISH



POWER OFF MANUALLY When completed, remove USB device.

1-8

2. EQ PROGRAM

Download program file name must be EQ_PRG_CM4750_***.BIN

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage

device and disable the security 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.



EQ UP



FINISH



POWER OFF AUTOMATICALLY When completed, remove USB device.

1-9

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label. Power consumption Refer to the main label. Dimensions (W x H x D) 206 x 308 x 284 mm Net Weight (Approx.) 3.1 kg Operating temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity 5 % to 90 % Bus Power Supply (USB) 5 V 500 mA

• INPUTS

AUX IN 2.0 Vrms (1 kHz, 0 dB), 75 Ω, RCA jack (L, R) x 1 PORT IN 1.2 Vrms (3.5 mm stereo jack)

• TUNER

FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz

• AMPLIFIER

Stereo mode 300 W + 300 W (3 Ω at 1 kHz, THD 20 %) Surround mode Front 300 W + 300 W (3 Ω at 1 kHz, THD 20 %) Subwoofer 400 W (3 Ω at 60 Hz, THD 20 %)

• CD

Frequency Response 100 to 20 000 Hz Signal-to-noise ratio 75 dB Dynamic range 75 dB

• FRONT SPEAKER

Model CMS4750F Type 2 Way 2 Speaker Impedance 4 Ω Rated Input Power 300 W Max. Input power 600 W Net Dimensions (W x H x D) 300 x 358 x 265 mm Net Weight 5.5 kg

• SUBWOOFER SPEAKER

Model CMS4750W Type 1 Way 1 Speaker Impedance 3 Ω Rated Input Power 400 W Max. Input power 800 W Net Dimensions (W x H x D) 310 x 358 x 305 mm Net Weight 5.7 kg

 Design and specifications are subject to change without notice.

1-10

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS ..................................................................................................................................... 2-3

1. CABINET AND MAIN FRAME SECTION (CM4750) ................................................................................ 2-3

2. MECHANISM DECK SECTION (DP17TM3) ............................................................................................ 2-5

3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7

4. SPEAKER SECTION ................................................................................................................................ 2-8

2-1

2-2

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (CM4750)

FRONT

B/T

SMPS

MAIN

260L

260R

464

A47

264

463

269

262

460

464

263

255

464

A43

464

A46

464

265

266

A44

266

464

261

252

A52

259

464

A42

251

253

CABLE1

CABLE4

300

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.

2. MECHANISM DECK SECTION (DP17TM3)

1026

1439

A001

1002

1005

1001

1049

1437

1024

1030

1024

1043

1045

A005

A006

1016

1013

1015

1020

1024

1003

1439

1018

1019

1011

1012

1437

1004

3. PACKING ACCESSORY SECTION

801 Instruction Ass'y

825 FM Wire Antenna

804 Bag

808 Batter

900 Remote Contro

803 Packing

802 Bo

4. SPEAKER SECTION

4-1. FRONT SPEAKER (CMS4750F)

A60

4-2. SUBWOOFER SPEAKER (CMS4750W)

A90

2-10

SECTION 3

ELECTRICAL

CONTENTS

ONE POINT REPAIR GUIDE ................................................................................................................... 3-2

1. NO POWER ............................................................................................................................................3-2

2. NO BOOTING WHEN POWER ON THE SET........................................................................................3-4

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET .....................................................................3-5

4. NO OPERATION OF MD ........................................................................................................................3-6

5. NO SOUND ...........................................................................................................................................3-11

AUDIO ELECTRICAL TROUBLESHOOTING GUIDE ................................................................... 3-17

1. POWER (SMPS) ...................................................................................................................................3-17

2. MCS PART CHECK ..............................................................................................................................3-20

3. IC504(M24C16) CHECK .......................................................................................................................3-20

4. FLD DISPLAY CHECK .........................................................................................................................3-21

5. PWM MODULATION CHECK ...............................................................................................................3-22

6. POWER AMP PART CHECK ...............................................................................................................3-24

7. TUNER / AUX FUNCTION CHECK ......................................................................................................3-25

8. TUNER FUNCTION CHECK.................................................................................................................3-26

CDP ELECTRICAL TROUBLESHOOTING GUIDE........................................................................3-27

1. CD FUNCTION .....................................................................................................................................3-27

2. DOUBLE USB FUNCTION ...................................................................................................................3-28

WAVEFORMS OF MAJOR CHECK POINT ......................................................................................3-29

1. SDRAM .................................................................................................................................................3-29

2. SERVO ..................................................................................................................................................3-29

3. AUDIO PATH ........................................................................................................................................3-30

4. USB .......................................................................................................................................................3-31

WIRING DIAGRAM....................................................................................................................................3-33

BLOCK DIAGRAMS .................................................................................................................................3-35

1. SYSTEM BLOCK DIAGRAM ................................................................................................................3-35

2. SMPS BLOCK DIAGRAM .....................................................................................................................3-37

3. AUDIO PATH BLOCK DIAGRAM .........................................................................................................3-39

4. POWER DIAGRAM ...............................................................................................................................3-41

CIRCUIT DIAGRAMS ...............................................................................................................................3-43

1. SMPS CIRCUIT DIAGRAM ..................................................................................................................3-43

2. MAIN - DSP CIRCUIT DIAGRAM .........................................................................................................3-45

3. MAIN - SERVO CIRCUIT DIAGRAM ....................................................................................................3-47

4. MAIN - ADC/ PWM CIRCUIT DIAGRAM .............................................................................................. 3-49

5. MAIN - AMP CIRCUIT DIAGRAM.........................................................................................................3-51

6. FRONT CIRCUIT DIAGRAM ................................................................................................................3-53

CIRCUIT VOLTAGE CHART .................................................................................................................3-55

1. ICs .........................................................................................................................................................3-55

2. CAPACITORS .......................................................................................................................................3-57

PRINTED CIRCUIT BOARD DIAGRAMS .......................................................................................... 3-59

1. SMPS P.C.BOARD ...............................................................................................................................3-59

2. MAIN P.C.BOARD ................................................................................................................................3-61

3. FRONT P.C.BOARD .............................................................................................................................3-63

3-1

ONE POINT REPAIR GUIDE

1. NO POWER

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-1. FUSE & BRIDGE DIODE

1-1-1. Solution

Please check and replace F901, BD901, TH901 or TH903 on SMPS board.

1-1-2. How to troubleshoot (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 or TH903 is normal or open.

1-1-3. Service hint (Any picture / Remark)

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

replace it with a new one.

< BD901 >

If BD901 is short-circuit,

< TH901 >

If TH901 is open,

replace it with a new one.

3-2

ONE POINT REPAIR GUIDE

NO POWER

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-2. 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 >

3-3

ONE POINT REPAIR GUIDE

2. NO BOOTING WHEN POWER ON THE SET

The set doesn’t work when press the power button on the front board or the remote control.

2-1. FLASH MEMORY

2-1-1. Solution

Please check and replace IC503 on MAIN board.

2-1-2. How to troubleshoot (Countermeasure)

1) Check 5.6 V to CN501 in standby mode.  If there is no 5.6 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 KEY1 changes high to low while pressing the power button

. X500 and X501 work normally but, if you can not power on the set, replace IC501 with a new one on the MAIN board.

2-1-3. Service hint (Any picture / Remark)

PWR_CTRL(R53D)

IC501

< Signal check point >

KEY1(R542)

3-4

ONE POINT REPAIR GUIDE

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET

When power on the set, any icons or characters on VFD are not displayed.

3-1. VFD

3-1-1. Solution

Please check and replace DIG302 on FRONT board.

3-1-2. How to troubleshoot (Countermeasure)

1) Check if VKK, FL+ and FL- are output from SMPS to VFD via the MAIN board.

2) Check if IC501 outputs VFD_D0, VFD_CLK and VFD_STB to the FRONT board.

3) Check the GR signal(pulse signal) of IC408 on the FRONT board. Check the SG signal(pulse signal) of IC408 on the FRONT board.

 If the GR and SG signal isn’t output, replace IC408 with a new one.  If the GR and SG signal is output, replace DIG302 with a new one.

3-1-3. Service hint (Any picture / Remark)

GR signal

SG signal

Click the picture,

and then drag to enlarge it.

Check the waveform on details.

GR SIGNAL ABOUT 30 V

SG SIGNAL ABOUT 30 V

3-5

< Waveform of GR and SG signal >

ONE POINT REPAIR GUIDE

4. NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SPINDLE MOTOR among them.

4-1. SPINDLE MOTOR

4-1-1. Solution

Please check and replace IC407, IC408 on MAIN board.

4-1-2. How to troubleshoot (Countermeasure)

1) Check the SPDO signal from pin24 of IC407.  If no signal, check 3.3 V(RF) and X400.

2) Check the SPIN- & SPIN+ 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 function after changing another MD.

4-1-3. Service hint (Any picture / Remark)

About 3.6 Vpp

< Waveform of SP- & SP+

for driving SPINDLE motor >

Sp+

Pin17 to CN405

Sp-

Pin18 to CN405

< Signal check point >

3-6

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SLED MOTOR among them.

4-2. SLED MOTOR

4-2-1. Solution

Please check and replace IC407, IC408 on MAIN board.

4-2-2. How to troubleshoot (Countermeasure)

1) Check 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 pickup module. Please check the function after changing another MD.

4-2-3. Service hint (Any picture / Remark)

SL- TO CN405

SL+ TO CN405

< Waveform of SLED- & SLED+

for driving SLED motor >

SLED+

Pin11 to CN405

SLED-

Pin12 to CN405

< Signal check point >

3-7

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the TRAY OPEN / CLOSE MOTOR among them.

4-3. TRAY OPEN / CLOSE MOTOR

4-3-1. Solution

Please check and replace IC407, IC408 on MAIN board.

4-3-2. How to troubleshoot (Countermeasure)

1) Check MOT_OPEN & MOT_CLOSE signals from Pin K4, L4 of IC501 to IC408.  If no signal, check +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 changing another MD.

4-3-3. Service hint (Any picture / Remark)

MOT_OPEN

LO- TO CN405

LO+ TO CN405

< Waveform

for driving TRAY open / close motor >

LOAD+

Pin9 to CN405

LOAD-

Pin10 to CN405

< Signal check point >

MOT_OPEN

Pin7 to CN405

MOT_CLOSE

Pin6 to CN405

3-8

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER TRACKING ACTUATOR.

4-4. LASER TRACKING ACTUATOR

4-4-1. Solution

Please check and replace IC407, IC408 on MAIN board.

4-4-2. How to troubleshoot (Countermeasure)

The tracking actuator makes the laser beam 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 CN408 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 CN405 and MD.

4) Check the MD.  If the pickup module has any trouble, it can not move the laser beam on the left or right side. Please check the function after changing another MD.

4-4-3. Service hint (Any picture / Remark)

< Waveform of TR±

for driving TRACKING actuator >

TR-

Pin15 to CN405

TR+

Pin16 to CN405

< Signal check point >

3-9

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER FOCUSING ACTUATOR.

4-5. LASER FOCUSING ACTUATOR

4-5-1. Solution

Please check and replace IC407, IC408 on MAIN board.

4-5-2. How to troubleshoot (Countermeasure)

The focusing actuator makes the laser beam 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 CN405 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 CN405 and MD.

4) Check the MD.  If the pickup module has any trouble, it can not move the laser beam on the top or bottom side. Please check the function after changing another MD.

4-5-3. Service hint (Any picture / Remark)

< Waveform of TR±

for driving FOCUSING actuator >

F-

Pin13 to CN405

F+

Pin14 to CN405

< Signal check point >

3-10

ONE POINT REPAIR GUIDE

5. NO SOUND

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

5-1. IN THE CD FUNCTION

5-1-1. Solution

Please check and replace IC501, IC601 on MAIN board.

5-1-2. How to troubleshoot (Countermeasure)

1) Check CD_BCLK, CD_LRCK, & CD_DOUTA signals from IC407 to IC501.  If no signal, check if the RF & servo signals from MD is entered to IC407. Refer to the “No operation of MD” guide on Item 4.

2) Check the following I2S signal flow. < I2S audio signal Interface >

- DAC_BCK : IC501_Pin E1 --> IC601_Pin23

- DAC_LRCK : IC501_Pin D1 --> IC601_Pin22 (44.1 kHz)

- DAC_DATA : IC501_Pin E2 --> IC601_Pin24

- DAC_MCLK : IC501_Pin D2 --> IC401_Pin44  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) Check if “Digital audio AMP block” on Item 5-2 is normal.

5-1-3. Service hint (Any picture / Remark)

P/UP

IC407

LC78615E

(New)

DSP IC501

MLC3730

12.288 MHZ

PWM

TAS5548

176PIN BGA

USB 2.0 OTG

Main Processor

USB 1.1

ARM

Host/Device

I-Cache

926EJS

400Mhz

SRAM (10K)

D-Cache

SDRAM

Controller

Boot ROM (20KB)

Interrupt controller

CDROM x8 speed

Decoder

ADC (12bit*5ch)

GDMA 3ch

Timer, Watchdog

GPIO (72 Max)

NAND Controller within BCH codec

SPI 4ch (Max)

14bits ECC

FR,FL

TAS5631B

16KB

DSP

133Mhz

16KB

SDHC-SDIO 4ch (Max)

Audio DSP-0

SRAM29KB

I-Cache 8KB

D-Cache 8KB

GDMA 2ch

RTC & Wake up

UART 4ch (Max)

I2C 2ch

DSP

133Mhz

Clock Controller

Reset Controller

Audio DSP-1

SRAM29KB

I-Cache 8KB

D-Cache 8KB

I2S (7.1ch)

SPDIF (Rx, Tx)

ADPCM

PLL

Test Controller

MCS_MCLK (16.93 MHz)

MCS_BCK(1.4 MHz)

MCS_DATA_OUT

MCS_LRCK(44.1 KHz)

< Waveform of I2S audio interface signals >

Woofer

TAS5631B

< I2S Signal Flow >

3-11

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output by DIGITAL AUDIO AMP DAMAGE, repair the set according to the following guide.

5-2. BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS)

5-2-1. Solution

Please check and replace IC701, IC702 on MAIN board.

5-2-2. How to troubleshoot (Countermeasure)

1) Check PWM_FL±, PWM_FR± & PWM_SW± signals from IC601 to IC701 & 702 each input function.  If no signal, check if I2S audio signals are entered to IC601. 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. 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 IC701/IC702_OUT_A/OUT_B & GND. a. If the impedance is 0 Ω, the IC must be damaged. b. After removing the heat sink, replace it with a new one.

5-2-3. Service hint (Any picture / Remark)

IC701

IC702

L701

L703

L702

L704

< Signal check point >

3-12

ONE POINT REPAIR GUIDE

NO SOUND

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

5-3. IN THE USB FUNCTION

5-3-1. Solution

Please check and replace IC501 on MAIN board & IC302 on USB board.

5-3-2. How to troubleshoot (Countermeasure)

1) Check +5V_USB to USB board.  If the USB LED are turned on, the voltage is okay, if so not, check +5.6 V to pin6 of CN302.

2) Check USB D1± or USB D2± from MAIN board to USB board. a. Check 2.0_D1±signals(pin U7, U8 ) or 1.1_D1± signals(pin A7, A8 ) to IC501. b. Check USB± signals to CN302(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) Check if “Digital audio AMP block” on item 5-2 is normal.

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

DSP IC501

MLC3730

176PIN BGA

USB 2.0 OTG

Main Processor

16KB

ARM

DSP

I-Cache

926EJS

133Mhz

16KB

400Mhz

D-Cache

Boot ROM (20KB)

ADC (12bit*5ch)

Timer, Watchdog

GPIO (72 Max)

SPI 4ch (Max)

SDHC-SDIO 4ch (Max)

12.288 MHZ

PWM

TAS5548

Audio DSP-0

SRAM29KB

I-Cache 8KB

D-Cache 8KB

GDMA 2ch

RTC & Wake up

UART 4ch (Max)

I2C 2ch

USB 1.1

Host/Device

SRAM (10K)

SDRAM Controller

Interrupt controller

CDROM x8 speed

Decoder

GDMA 3ch

NAND Controller within BCH codec

14bits ECC

Audio DSP-1

SRAM29KB

DSP

I-Cache 8KB

133Mhz

D-Cache 8KB

I2S (7.1ch)

SPDIF (Rx, Tx)

ADPCM

PLL

Clock Controller

Reset Controller

Test Controller

FR,FL

Woofer

USB1_D±

USB2_D±

D- to pin 1&4 of CN302

D+ to pin 2&5 of CN302

< Waveform of USB D± signal >

TAS5631B

< USB function signal ﬂ ow >

3-13

ONE POINT REPAIR GUIDE

NO SOUND

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

5-4. IN THE AUX FUNCTION

5-4-1. Solution

Please check and replace IC201 on MAIN board.

5-4-2. How to troubleshoot (Countermeasure)

1) Check AUX_L/R signals to IC201 (Pin23, 24).

2) Check if MCS_BCK, MCS_LRCK & MCS_MCLK are entered from IC501 to IC201.

3) Check if ADC_DATA is entered from IC201 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it a new one.

4) Check the following I2S signal flow from IC801 to IC602. (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 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)

AUX

AUX _L /R

12.288 MHZ

PWM

TAS5548

IC201

CS5346

FR,FL

Woofer

DSP IC501

MLC3730

176PIN BGA

USB 2.0 OTG

Main Processor

16KB

ARM

I-Cache

926EJS

16KB

400Mhz

D-Cache

Boot ROM (20KB)

ADC (12bit*5ch)

Timer, Watchdog

GPIO (72 Max)

SPI 4ch (Max)

Audio DSP-0

SRAM29KB

DSP

I-Cache 8KB

133Mhz

D-Cache 8KB

GDMA 2ch

RTC & Wake up

UART 4ch (Max)

I2C 2ch

SDHC-SDIO 4ch (Max)

USB 1.1

Host/Device

SRAM (10K)

SDRAM Controller

Interrupt controller

CDROM x8 speed

Decoder

GDMA 3ch

NAND Controller within BCH codec

14bits ECC

TAS5631B

Audio DSP-1

SRAM29KB

DSP

I-Cache 8KB

133Mhz

D-Cache 8KB

I2S (7.1ch)

SPDIF (Rx, Tx)

ADPCM

PLL

Clock Controller

Reset Controller

Test Controller

MCS_MCLK to R220

MCS_LRCK to R219

AUX_R to R227

MCS_BCK to R216

AUX_L to R226

AD C_DATA to R215

< Signal check point >

< AUX function signal ﬂ ow >

3-14

ONE POINT REPAIR GUIDE

NO SOUND

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

5-5. IN THE TUNER FUNCTION

5-5-1. Solution

Please check and replace IC201, TU500 on MAIN board.

5-5-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_LR is entered from Pin1, 3 of TU500 to IC201(Pin26, 27).

 If no signals, check +3.3 V for tuner power.  Check if the tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC501 to TU500.

If it doesn’t work, replace TUNER with a new one.

2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC201.

3) Check if ADC_DATA is entered from IC201 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it with a new one.

4) Check the following I2S audio signal flow from IC501 to IC601. (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 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)

DSP IC501

MLC3730

176PIN BGA

TUN ER

TUNER_ L/R

12.288 MHZ

PWM

TAS5548

IC201

CS5346

FR,FL

USB 2.0 OTG

Main Processor

USB 1.1

ARM

Host/Device

926EJS

400Mhz

SRAM (10K)

SDRAM

Controller

Boot ROM (20KB)

Interrupt

controller

CDROM x8 speed

Decoder

ADC (12bit*5ch)

GDMA 3ch

Timer, Watchdog

GPIO (72 Max)

NAND Controller within BCH codec

SPI 4ch (Max)

14bits ECC

TAS5631B

16KB

I-Cache

133Mhz

16KB

D-Cache

SDHC-SDIO 4ch (Max)

Audio DSP-0

SRAM29KB

DSP

I-Cache 8KB

D-Cache 8KB

GDMA 2ch

RTC & Wake up

UART 4ch (Max)

I2C 2ch

Audio DSP-1

SRAM29KB

DSP

I-Cache 8KB

133Mhz

D-Cache 8KB

I2S (7.1ch)

SPDIF (Rx, Tx)

ADPCM

PLL

Clock Controller

Reset Controller

Test Controller

TUNER_L to C214

< Signal check point >

TUNER_R to C215

Woof er

TAS5631B

< TUNER IN function signal ﬂ ow >

3-15

ONE POINT REPAIR GUIDE

NO SOUND

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

5-6. IN THE PORTABLE FUNCTION

5-6-1. Solution

Please check and replace IC201 on MAIN board.

5-6-2. How to troubleshoot (Countermeasure)

1) Check PT_L/R signals to IC201 (Pin9, 10).

2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC201.

3) Check if ADC_DATA is entered from IC201 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC201. If NG, replace it a new one.

4) Check the following I2S signal flow from IC501 to IC601. (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 Audio AMP” guide on Item 5-2.  If AMP is damaged, replace it with a new one.

5-6-3. Service hint (Any picture / Remark)

Port able

PTB_L/R

12.288 MHZ

PWM

TAS5548

IC201

CS5346

FR,FL

Woofer

DSP IC501

MLC3730

176PIN BGA

USB 2.0 OTG

Main Processor

16KB

ARM

I-Cache

926EJS

16KB

400Mhz

D-Cache

Boot ROM (20KB)

ADC (12bit*5ch)

Timer, Watchdog

GPIO (72 Max)

SPI 4ch (Max)

Audio DSP-0

SRAM29KB

DSP

I-Cache 8KB

133Mhz

D-Cache 8KB

GDMA 2ch

RTC & Wake up

UART 4ch (Max)

I2C 2ch

SDHC-SDIO 4ch (Max)

USB 1.1

Host/Device

SRAM (10K)

SDRAM

Controller

Interrupt controller

CDROM x8 speed

Decoder

GDMA 3ch

NAND Controller within BCH codec

14bits ECC

TAS5631B

Audio DSP-1

SRAM29KB

DSP

I-Cache 8KB

133Mhz

D-Cache 8KB

I2S (7.1ch)

SPDIF (Rx, Tx)

ADPCM

PLL

Clock Controller

Reset Controller

Test Controller

PTB_L to R229

PTB_R to R228

< Signal check point >

< PORTABLE function signal ﬂ ow >

3-16

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

1. POWER (SMPS)

No 5.6 VA

F901 normal? Replace F901 (Use the same fuse).

BD901 normal? Replace BD901.

TH901(TH903) normal? Replace TH901.

YES

Is Vcc

(10 V ~ 18 V) supplied to

IC901 Pin7?

YES

D902 normal?

Check or replace D902.

D933 / D934 normal? Replace D933 / D934.

YES

Is there

about 2.5 V at

Replace IC941.

IC941 Pin1?

YES

D935 normal? Replace D935.

YES

D932 normal? Replace D932.

YES

D931 normal? Replace D931.

YES

Power line of main PCB is short.

3-17

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No PVDD

YES

F901 normal? Replace F901 (Use the same fuse).

YES

BD901 normal? Replace BD901.

YES

TH901(TH903) normal? Replace TH901.

Is Vcc

(10 V ~ 18 V) supplied to

IC911 Pin4?

YES

D903 normal?

YES

Q911 base "H"?

YES

•

Check P-CTRL "H" signal from MCS.

• Check PC902.

Check or replace Q911.

Q901 normal? Replace Q901.

YES

D951 normal? Replace D951.

Check or replace D903.

YES

Is there about 2.5 V

at IC951 Pin1?

YES

Power line of main PCB is short.

Replace IC951.

3-18

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No 12 V

YES

Is Vcc (15 V)

supplied to IC931?

YES

IC931 Pin4 “H”?

YES

Check or replace IC931.

No VFD

YES

D931 normal?

Check or replace D935.

Check P-CTRL “H” signal

from MCS.

Check or replace D931.

YES

ZD931 normal?

YES

Q501 / Q502 normal?

YES

Check or replace VFD.

3-19

Check or replace ZD931.

Check or replace Q501 / Q502.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

2. MCS PART CHECK

MCS PART CHECK

YES

Check if

voltage of CN501 Pin7

is 5.6 VA.

YES

Check if IC510

have 3.3 V output.

YES

Check if IC508

have 1.2 V output.

YES

X501: 32.768 kHz,

X500: 24 MHz,

Check the operation.

Refer to

SMPS troubleshooting.

Check and change IC510.

Check and change IC508.

YES

3. IC504(M24C16) CHECK

CHECK IC501 PIN.

YES

Check pinC2, pinB1

DATA : CLK

YES

OK OK

Check MCS

voltage 3.3 VA.

YES

Check MCS.

YES

3-20

Refer to MCS troubleshooting.

Replace MCS.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

4. FLD DISPLAY CHECK

FLD DISPLAY CHECK

YES

Check

CN501 Pin13,14,15 input

voltage.

YES

Check if both end voltage

of FL+, FL- are over 2.9 V

VKK : over 25.6 V.

YES

Check CN301

connection and power

Pin1, 2, 3(FL+, FL-, VKK),

Pin8(5.6 V).

YES

Check

IC301(MC3401) voltage

Pin30 VKK: -25.8 V

Pin13, 43: 3.3 V.

Refer to SMPS troubleshooting.

Check CN301 connection.

YES

Check each

Pin voltage.

YES

If voltage is not 3.4 V.

YES

Check

IC501->IC301

data communication

STB/ DATA/ CLK

YES

FLD light on?

YES

Check IC301.

YES

Check output data IC501 Pin D2.

Check input data

IC501 Pin F1,F2,G1.

YES

Check IC501.

YES

3-21

Replace IC301.

Replace IC501.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

5. PWM MODULATION CHECK

PWM MODULATION PART CHECK

YES

Check

CN501 Pin7,8

(5.6 V)

YES

• Check IC601(TAS5548) VDD 3.3 V - Pin9,14.35,50.

• Check X601 (12.288 MHz).

YES

Check

X601(12.288 MHz)

operation.

YES

Check

IC601 Pin21 CLK

input.

Refer to

SMPS troubleshooting.

Check X601

(12.288 MHz).

YES

Replace X601(12.288 MHz).

YES

Check IC501

(MLC3730)

Pin B3: RESET

Pin A1: SDA Pin A2: SCL

output.

YES

Check line

resistor output

RST: R53E / SCL: R53C /

SDA: R53B.

YES

3-22

Replace R53E,R53C,R53B.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

YES

Check

IC601(TAS5548)

input data

Pin24

PWM wave.

YES

Check PWM

modulator output

FL: Pin48(-),49(+)

FR: Pin46(-),47(+).

Other output

check.

Check

CD Assy communication

Pin22, 23, 24.

YES

Check

IC601 input

data.

YES

Check IC601.

YES

Refer to

CD troubleshooting.

Check each line

resistor output.

Replace

IC601.

YES

3-23

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

6. POWER AMP PART CHECK

POWER AMP PART CHECK

YES

Check

CN501 Pin10: +12 V

Pin1,2,3: 47.3 V.

YES

Check IC701, IC702

Pin51, 52, 42, 43, 38, 39, 30, 31 input voltage.

YES

Check IC701, IC702

Pin64: +12 V input.

YES

Check PWM Modulator input

IC701 Pin4, 5, 10, 11/ IC702 Pin4, 5.

YES

Check IC701, IC702

Pin28, 29, 36, 37, 44, 45, 52, 53.

Refer to SMPS troubleshooting.

Check each line resistor output voltage.

YES

Check output

line coil.

YES

Replace the coil.

3-24

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

7. TUNER / AUX FUNCTION CHECK

FUNCTION CHECK

YES

Check IC201

(CS5346) Pin23, 24,

26, 27 input.

YES

Check IC201

(CS5346) Pin41 output

data.

YES

Check

IC501(MLC3730)

input data.

YES

IC501(MLC3730)

output data.

Check JK200,TU500.

Check IC201

Pin5: +3.3 V Pin14: +5 V.

YES

Check IC201 Pin5: +3.3 V,

Pin6: High,

Pin14: +5 V.

NONO

Check CN501 Pin7,8: +5.6 V.

Check IC201 Pin41: SDOUT, Pin42: SLCK, Pin43: LRCK, Pin44: MCLK.

YES

Replace IC201.

YES

3-25

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

8. TUNER FUNCTION CHECK

TUNER FUNCTION CHECK

YES

Check tuner

module(TU500)

operation.

YES

Check IC501 Pin P8, P10, P11, T15.

YES

Refer to function check.

Check tuner module voltage

(Pin4: +3.3 V).

Check tuner module data.

3-26

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

1. CD FUNCTION

CD FUNCTION

YES

Can the

disc insert?

YES

Disc reading

is ok?

YES

Is no signal at spk?

YES

Check

the signal of

IC407 Pin52,53,54.

Is load +,- ok?

Is Motor ok? (about 12 )

IM driving (Focus and

tracking) is ok?

Check Vcc of IC407.

YES

Is Motor_open/close

OK? (IC408 Pin6,7)

Check IC408.

Check loading motor.

tracking/sled signal

Is the MD(CN404

Pin22) about 190 mV?

YES

Focus/

is ok?

YES

Check IC408

(Motor drive IC).

Check IM (pick-up).

YES

Check

the signal (16.0344 MHz)

at IC407

Pin51.

YES

Check IC501

input/output and

control line.

YES

Refer to function

check.

Check Cristal (X400).

Replace IC501.

3-27

Replace Cristal

(X400).

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

2. DOUBLE USB FUNCTION

USB FUNCTION

YES

Plug-in usb device.

YES

Display “NO USB”.

YES

Display “READ”.

YES

Display “NO FILE”.

YES

Check usb audio ﬁ le in usb device

(MP3, WMA ﬁ le is playable)

Check USB_5V.

YES

Check USB_D+/D-

(R380,R381/ R382,R383).

YES

Check IC501

(Pin U7,U8/ A7,A8).

NONO

Check CN302.

Check USB jack (JK301/ JK302).

Replace IC501.

3-28

1. SDRAM

WAVEFORMS OF MAJOR CHECK POINT

2. SERVO

CLK

DATA

ADDRESS

IC502 PIN38

IC502 PIN53

IC502 PIN35

IC503 PIN1

CD-16 M

IC501 PIN M1

3-29

3. AUDIO PATH

CD_BCK

CD_LRCK

IC501 PIN N4

IC501 PIN N1

CD_DATA

IC501 PIN N2

DAC_MCLK

IC501 PIN D2

DAC_BCK

IC501 PIN E1

DAC_LRCK

IC501 PIN D1

DAC_DATA

IC501 PIN E2

3-30

4. USB

USB_5 V

D+

IC501 PIN A8

D-

IC501 PIN A7

3-31

3-32

3-33 3-34

WIRING DIAGRAM

23P10P

SPK TERMINAL

TUNER

MODULE

1 CD MD

MAIN + CD

19P

USB(2EA) + FRONT

SMPS

15P

AUX

JACK

1. [Total CNT : 6 ea]

1. FFC Cable MAIN FRONT : 1 EA

MAIN MD: 2 EA MAIN BT module: 1 EA

2. Harness Single SMPS MAIN : 1 EA

MAIN USB: 1 EA

Power

cord

: Harness

: FFC

3-35 3-36

BLOCK DIAGRAMS

1. SYSTEM BLOCK DIAGRAM

DSP IC501

MLC3730

176PIN BGA

IC201

CS5346

P/UP

IC408

AM5890

Motor

Drive

SPDO/SLDO/FOD/TRD

OP_SW,CL_SW

A,B,C,D,E,F/ PD

MOT_MUTE/CLOSE/OPEN

SPIN ±

SLED±

F±/TR±

LOAD

IC407



LC78615E

(New)



LD/VREF

IM(CMS-S79RFVC6)



CD_16M

CD_MCK/RW/DIN_OUT/BUSY

CD_RESB

CD_BCK/CD_LRCK/CD_DATA

ADC_RST/CLK/DAT

TUNER_L/R

TUNER

AUX

AUX_L/R

PTB_L/R

Portable

ADC_DATA

REMOCON/KEY

VFD

VFD_STB/CLK/DO

IC301 ABOV

TUNER

TUNER_L/R

TUNER_RST/CE/DAT/CLK

PWM DAT/CLK

IC601

TAS5548

PWM

FR ±

AMP_PDN

AMP_OTW/SD/CLIP/AMP PROTECT

IC701

AMP IC

TAS5631B

IC702

AMP IC

TAS5631B

PWM_RST

DAC_BCK/LRCK/DATA

PWM_MUTE

DAC_BCK/DAC_LRCK/DAC_MCLK

DRM_SEL/DRM_CKE/DRM_RAS DRM_CLK/DRM_CAS/DRM_WEN

D0~D15/A0~A11/A13~A16

SF_DI/DO

SF_CS/CLK(SPI)

USB1_D±

IC511

IPOD 2.0C

CP_RESET/SCL/SDA

IC502 SDRAM

IC503 FLASH

W25Q16FVSSIG

8 MB

2 MB

BT 4.0(New)

RX/TX/RTS/CTS/RST/SDA/SCL

USB2_D

PTB_SENSE

SF_DI/DO

SF_CS/CLK(SPI)

IC504 FLASH

W25Q80DVSSIG

1 MB

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 up

UART 4ch (Max)

I2C 2ch

SDHC-SDIO 4ch (Max)

USB 2.0 OTG

SRAM (10K)

Main Processor

Audio DSP-0

GDMA 2ch

I2S (7.1ch)

SPDIF (Rx, Tx)

ADPCM

PLL

Clock Controller

Reset Controller

Test Controller

Audio DSP-1

USB 1.1

Host/Device

ARM

926EJS

16KB

I-Cache

16KB

D-Cache

400Mhz

DSP

133Mhz

SRAM29KB

I-Cache 8KB

D-Cache 8KB

DSP

133Mhz

SRAM29KB

I-Cache 8KB

D-Cache 8KB

Boot ROM (20KB)

SDRAM

Controller

2. SMPS BLOCK DIAGRAM

3-37 3-38

PVDD

Noise

Filter

Block

(X-cap

Line Filter)

Snubber

Block

Main

SMPS IC

Block

T R A N

Snubber

Block

Photo coupler

FL+

FL-

Vkk

On/Off

12 V LDO

12 V

5.6 VA

P. C TL

On/Off

AMP SMPS IC With FET

Block

F U S E

Y-Cap

T R A N

CN901

Feedback

3. AUDIO PATH BLOCK DIAGRAM

3-39 3-40

24MHz

AMP Block

DSP

Block

PWM

TAS5548



FR,FL



Woofer



Tuner

Auxin

ADC

 CS5346 (SLAVE)

AUX 

MLC3730

(176 PIN)

DAC_DATA

DAC_LRCK

DAC_BCK

TUNER

DAC_MCLK



12.288

MHz



DAC_LRCK

DAC_BCK



RF

LC78615E



CD_BCK

CD_LRCK

CD_DATA



ADC_DATA

32.768 KHz

PORTABLE

PORTABLE

TAS5631B

300Wx2

400Wx1

4. POWER DIAGRAM

3-41 3-42

+12 V

SMPS

+5.6 VA

FAN X 1

TU500

TUNER

YST996

IC504

Flash

1MB

IC601

TAS5548

IC501

MCS

MLC3730

IC502

SDRAM

EM639165

IC407

RF IC

IC508

TPS563200

IC301

VFD

RMC

+1.2 VA

IC503

FLASH

2MB

IC510

LDO

AZ1117

IC302

USB PWR

LM37102D

IC408

MOTOR

AM3053S

+5 V

3.7 VA

VFD

5 mA

3 mA

150 mA

25 mA

70 mA

+5 V

370 mA

2 mA

2.668A

100 mA

450 mA

Pick up

80 mA

15 mA

10 mA

20 mA 20 mA

160 mA

ADC

IC201

CS5346

20 mA

VKK

FL ±

597 mA

550 mA

1 A

642 mA

601 mA

Bluetooth

Option

38 mA

310 mA

Diode delete

Diode

delete

CP Chip

Option

7 mA

+3.3 V

IC701

AMP

IC202

LDO

LM37102D

IC507

LDO

TJ4220

IC506

RESET

AZ7027

IC505

PWR SENS

AZ7027

2 mA 2 mA

10 mA

DVCC_3.3 V

USB HUB

IC509

AZ1117

USB HUB

MCS_1.2 V

8 LED

100 mA

110 mA

RS1G

MCS_3.3 V

DVCC_5 V

SDB0540 SDB0540

PWR_CTRL

USB_P_CTRL

PWR_CTRL

PVDD

IC701/IC702

AMP

3-43 3-44

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

WHEN SERVICING 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 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.

B C D E F G H I J K L M N O P Q R ST

SMPS

EAX66343021-SD_Rev0_1.0

2015. 07. 28

3-45 3-46

2. MAIN - DSP CIRCUIT DIAGRAM

14 13

: WAVEFORM NUMBER

B C D E F G H I J K L M N O P Q R ST

DSP

EAX66323901-SD(#01)_Rev8_1.1

2015. 01. 05

3-47 3-48

3. MAIN - SERVO CIRCUIT DIAGRAM

B C D E F G H I J K L M N O P Q R ST

SERVO

EAX66323901-SD(#02)_Rev8_1.1

2015. 01. 05

3-49 3-50

4. MAIN - ADC/ PWM CIRCUIT DIAGRAM

B C D E F G H I J K L M N O P Q R ST

ADC/PWM

EAX66323901-SD(#03)_Rev8_1.1

2015. 01. 05

3-51 3-52

5. MAIN - AMP CIRCUIT DIAGRAM

B C D E F G H I J K L M N O P Q R ST

AMP

EAX66323901-SD(#04)_Rev8_1.1

2015. 01. 05

3-53 3-54

6. FRONT CIRCUIT DIAGRAM

B C D E F G H I J K L M N O P Q R ST

FRONT

EAX65586201_Rev2_1.2

2015. 01. 29

3-55 3-56

CIRCUIT VOLTAGE CHART

1. ICs

Location Pin No. SPEC EE Mode (V) Margin Playback Mode (V) Margin

IC503 Flash (W25Q64FVSSIG)

8(VDD) 2.7~3.6 3.24 - 3.24 -

IC505 P-SENSE(AZ7027RTRE1)

1(VCC) <18 3.6 - 3.6 -

IC506 RESET(AZ7027RTRE1)

1(VCC) <18 3.15 - 3.16 -

IC507 LDO (TJ4220GDP-ADJ)

3(VIN) 2.5~6 4.91 - 4.88 -

6(VOUT) - 3.25 - 3.25 -

IC510 LDO (AZ1117BH-ADJ)

2(OUTPUT) <15 5.67 - 5.66 -

3(INPUT) <15 4.02 - 4.02 -

IC511 IPOD(MFI337S3959)

8(VCC) 1.6~5.5 3.24 3.24 -

IC601 PWM (TAS5548DGG)

9(AVDD) 2.97~3.63 3.25 - 3.24 -

14(DVDD2_CORE) 2.97~3.63 3.24 - 3.23 -

35(DVDD1_CORE) 2.97~3.63 3.24 - 3.23 -

50(AVDD_PWM) 2.97~3.63 3.24 - 3.23 -

IC701 AMP(TAS5631B)

55, 56 (GVDD_A/B) 10.8~13.2 11.96 - 11.96 -

25, 26 (GVDD_C/D) 10.8~13.2 11.96 - 11.96 -

64(VDD) 10.8~13.2 12 - 12

50, 51(PVDD_A) 25~52.5 47.3 - 47.3 -

42, 43(PVDD_B) 25~52.5 47.3 - 47.3 -

38, 39(PVDD_C) 25~52.5 47.3 - 47.3

29, 30(PVDD_D) 25~52.5 47.3 - 47.3 -

FRONT Board

IC301 VFD (MC3401L)

13(VDD) 3.0~5.5 3.24 -1.26 3.24 -1.26

43(VDD) 3.0~5.5 3.24 -1.26 3.24 -1.26

30(VEE) VDD-35 -22.4 -9.36 -22.5 -9.26

IC302 LDO (LM37102D)

2(VIN) 2.25~16 5.69 3.44 5.68 3.43

3(VOUT) - 5.05 - 5.05 -

Location Pin No. SPEC EE Mode (V) Margin Playback Mode (V) Margin

MAIN Board

IC201 ADC(CS5346)

5(VLC) 3.13~5.25 3.24 0.11 3.24 0.11

14(VA) 4.75~5.25 5.08 0.17 5.08 0.17

36(VLS) 3.13~5.25 3.24 0.11 3.24 0.11

46(VD) 3.13~3.47 3.24 0.11 3.24 0.11

IC202 LDO (LM37102D-ADJ)

2(VIN) 2.25~16 5.68 3.43 5.67 3.42

3(VOUT) - 5.08 - 5.08 -

IC407 SERVER (LC78615E)

18(AVDD) 3.0~3.6 3.24 0.24 3.24 0.24

28(VVDD1) 3.0~3.6 3.24 0.24 3.24 0.24

33(DVDD) 3.0~3.6 3.24 0.24 3.24 0.24

59(DVDD) 3.0~3.6 3.24 0.24 3.24 0.24

63(XVDD) 3.0~3.6 3.24 0.24 3.24 0.24

IC408 MOTOR(AM5890)

8(VCC1) 4.3~13.2 5.08 - 5.08 -

19(VCC2) 4.3~Vcc1 5.08 - 5.07 -

IC501 MPEG(MLC3730)

A4 (VDD33ADC) 3.0~3.6 3.24 - 3.24 -

B7 (VDDUSB11) 3.0~3.6 3.24 - 3.24 -

A9 (VDD12CORE) 1.08~1.32 1.18 - 1.18 -

A10 (VDD33IO) 3.0~3.6 3.24 - 3.24 -

E9 (VDD12CORE) 1.08~1.32 1.18 - 1.18 -

D14 (VDD33IO) 3.0~3.6 3.24 - 3.24 -

J14 (VDD12CORE) 1.08~1.32 1.18 - 1.18 -

P14 (VDD33IO) 3.0~3.6 3.24 - 3.24 -

T16(VDD30RTC) 2.75~3.3 3.15 - 3.16 -

T10 (VDD12ALIVE) 1.08~1.32 1.18 - 1.18 -

U9 (VDD33OSC) 3.0~3.6 3.24 - 3.24 -

P9 (VDD12USB20) 1.08~1.32 1.19 - 1.19 -

U6 (VDD33USB20) 3.0~3.6 3.24 - 3.24 -

U5 (VDD33USB20) 3.0~3.6 3.24 - 3.24 -

U4 (VDD12CORE) 1.08~1.32 1.18 - 1.18 -

P4 (VDD33IO) 3.0~3.6 3.24 - 3.24 -

J4 (VDD12INT) 1.08~1.32 1.18 - 1.18 -

D4 (VDD33IO) 3.0~3.6 3.24 - 3.24 -

IC502 SDRAM (W9812G6JH-6)

1(VDD) 3.0~3.6 3.24 - 3.24 -

3(VDDQ) 3.0~3.6 3.24 - 3.24 -

9(VDDQ) 3.0~3.6 3.24 - 3.24 -

14(VDD) 3.0~3.6 3.24 - 3.24 -

27(VDD) 3.0~3.6 3.24 - 3.24 -

43(VDDQ) 3.0~3.6 3.24 - 3.24 -

49(VDDQ) 3.0~3.6 3.24 - 3.24 -

3-57 3-58

2. CAPACITORS

Loca. No.

Value

Capacitor

(uF)

Voltage_

Spec

EEMode Play back

Positive

(+)

Negative

(-)

Gap Margin

Positive

(+)

Negative

(-)

Gap Margin

MAIN Board

C244 47 uF 16 V 5.08 V 0 V 5.08 V 10.92 V 5.08 V 0 V 5.08 V 10.92 V

C402 100 uF 16 V 5.08 V 0 V 5.08 V 10.92 V 5.08 V 0 V 5.08 V 10.92 V

C404 47 uF 16 V 3.24 V 0 V 3.24 V 12.76 V 3.23 V 0 V 3.23 V 12.77 V

C429 220 uF 10 V 5.08 V 0 V 5.08 V 4.92 V 5.07 V 0 V 5.07 V 4.93 V

C479 220 uF 10 V 1.68 V 0 V 1.68 V 8.32 V 1.68 V 0 V 1.68 V 8.32 V

C481 47 uF 16 V 3.24 V 0 V 3.24 V 12.76 V 3.23 V 0 V 3.23 V 12.77 V

C501 1000 uF 6.3 V 3.16 V 0 V 3.16 V 3.14 V 3.16 V 0 V 3.16 V 3.14 V

C579 10 uF 16 V 3.24 V 0 V 3.24 V 12.76 V 3.24 V 0 V 3.24 V 12.76 V

C618 100 uF 16 V 3.25 V 0 V 3.25 V 12.75 V 3.25 V 0 V 3.25 V 12.75 V

C643 100 uF 16 V 5.08 V 0 V 5.08 V 10.92 V 5.08 V 0 V 5.08 V 10.92 V

C748 680 uF 63 V 47.3 V 0 V 47.3 V 15.7 47.3 V 0 V 47.3 V 15.7

C749 680 uF 63 V 47.3 V 0 V 47.3 V 15.7 47.3 V 0 V 47.3 V 15.7

C752 680 uF 63 V 47.3 V 0 V 47.3 V 15.7 47.3 V 0 V 47.3 V 15.7

C753 680 uF 63 V 47.3 V 0 V 47.3 V 15.7 47.3 V 0 V 47.3 V 15.7

FRONT Board

C310 220 uF 10 V 3.24 V 0 V 3.24 V 6.76 V 3.24 V 0 V 3.24 V 6.76 V

C316 100 uF 16 V 3.16 V 0 V 3.16 V 12.84 V 3.14 V 0 V 3.14 V 12.86 V

C377 47 uF 50 V -18.1 V 0 V -18.1 V 68.1 V -18.2 V 0 V -18.2 V 68.2 V

Location No. SPEC Test (V)

SMPS Board

C904 330 uF / 450 V 315

C909 22 uF / 50 V 14.7

C911 47 uF / 50 V 18

C914 10 uF / 50 V 17.4

C931 220 uF / 16 V 2.9

C932 47 uF / 50 V 22.9

C933 / C934 1000 uF / 16 V 5.5

C935 / C936 100 uF / 50 V 13.5 / 11.9

C954 / C955 1000 uF / 63 V 47.3 V

3-59 3-60

(TOP VIEW) (BOTTOM VIEW)

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD

NOTE) Warning

Parts that are critical with respect to risk of fire or electrical shock.

(TOP VIEW) (BOTTOM VIEW)

3-61 3-62

2. MAIN P.C.BOARD

3-63 3-64

(TOP VIEW) (BOTTOM VIEW)

3. FRONT P.C.BOARD

LG CM4750, CMS4750F Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual