LG CM9750 Schematic

Download

Page 1

SERVICE MANUAL

CAUTION

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

Internal Use Only

Website http://biz.lgservice.com

JULY, 2015

MODEL: CM9750 (CM9750, CMS9750F)

MODEL: CM9750

(CM9750, CMS9750F)

MINI HI-FI SYSTEM

P/NO : AFN77277023

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 GUIDE ...................................................................................................................... 1-8

FOTA UPDATE ................................................................................................................................................ 1-11

SPECIFICATIONS ........................................................................................................................................... 1-12

1-2

Page 4

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

Page 5

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

Page 6

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

Page 7

HIDDEN KEY MODE

HIDDEN MODE KEYS

Version Check Front Stop + RMC ‘ ’ for 5s

EEPROM Initial Front Stop + RMC ‘ ’ for 5s

EEPROM Edit Front Stop + RMC ‘ ’ for 5s

APD Test Display Front Stop + RMC ‘3’ for 5s

Clip Front Stop + RMC ‘Mute’ for 5s

Disc Lock On/Off Front Stop + RMC ‘Stop’ for 5s

Front Stop + RMC ‘EQ’ for 5s

Power Disc Lock On/Off

Demo All Key Lock On/Off Front Stop + RMC ‘9’ for 5s

BT Auto Power On/Off Front/RMC Power Key for 5s

Child Safe On/Off Volume 0(Min) + Front ENTER Key for 3s

or Front Stop + Front Open for 5s

1-6

Page 8

SERVICE INFORMATION FOR EEPROM

POWER ON

VFD “NO DISC” status

Front ‘STOP’ + Remote control “ ”

push same timing during 5s

FLD “OP00-…..”

Move to appropriate position

And make changes

with RMC “ , , , REPEAT” key.

It is possible at any function. (ex. It is possible at VFD “NO USB” status, too.) This is an example.

Press STOP Key

VFD “WRITE OK”

Front ‘STOP’ + Remote control “ ”

push same timing during 5s

VFD “E2P CLR”

Completed

1-7

Page 9

PROGRAM DOWNLOAD GUIDE

1. AUDIO PROGRAM

Download program file name must be MICOM_CM8450_YYMMDDX.HEX

If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then 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



MICOM UP



FINISH



Auto POWER OFF

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

1-8

Page 10

2. CD PROGRAM

Download program file name must be HG580_CM8450_YYMMDDX.bin

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



Auto POWER OFF

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

1-9

Page 11

3. EQ PROGRAM

Download program file name must be EQ_PRG.BIN

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



Auto POWER OFF

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

1-10

Page 12

FOTA UPDATE

Step1 : App connecting

(Check FW version)

Step4 : Download from CDN server

Step2 : Device version info

Step5 : Transfer FW

Step3 : Select update button

Step6 : FW Flash Writing

Step7 : FOTA complete

1-11

Page 13

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label. Power consumption Refer to the main label. Networked standby : 0.4 W (If all network ports are activated.) Dimensions (W x H x D) 450 mm x 160 mm x 335 mm Net Weight (Approx.) 6.5 kg Operating temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity 60 % Bus Power Supply 5 V 500 mA

• INPUTS

AUX IN 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) PORT. IN 1.2 Vrms (3.5 Ø jack) MIC 27 mV

• CD

Frequency Response 40 to 20 000 Hz Signal-to-noise ratio 75 dB Dynamic range 80 dB

• AMPLIFIER

Total output 3 000 W FRONT 500 W x 2 (4 Ω at 1 kHz) WOOFER 1 000 W x 2 (8 Ω at 70 Hz) THD 25 %

• FRONT SPEAKER

Type Front : 2 Way 2 Speaker Surround : 1 Way 1 Speaker Impedance Front : 4 Ω Surround : 8 Ω Rated Input Power Front : 500 W Surround : 1 000 W Max. Input power Front : 1 000 W Surround : 2 000 W Net Dimensions (W x H x D) 414 mm x 562 mm x 376 mm Net Weight 18.3 kg

• Design and specifications are subject to change without notice.

1-12

Page 14

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-3

2. MECHANISM DECK SECTION ................................................................................................................ 2-5

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

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

2-1

Page 15

2-2

Page 16

MAIN

A46

443

273

468

A47

443

274

266

443

467

509

468

262

FRONT

FRONT_CTRL

NFC Tag

443

253

CABLE1

A52

443

A45

443

263

265

443

CABLE2

272

252

A42

250

251

254

SMPS

276

275

468

467

263

467

264

443

498

271

498

271

467

270

A43

300

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

NOTES) THE EXCLAMATION POINT WITHIN AN

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

Page 17

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

2. MECHANISM DECK SECTION

Page 18

3. PACKING ACCESSORY SECTION

801 Owner’s manual

Filter, Ferrite Core

826A

803 Packing

804 Bag

808 Batteries

900 Remote Control

Packing803

802 Box

Page 19

4. SPEAKER SECTION

A60L

A60R

Page 20

SECTION 3 ELECTRICAL

CONTENTS

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

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

2. NO AMP POWER ................................................................................................................................... 3-3

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

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

5. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT .......................................................................... 3-6

6. D-PROTECTION IS DISPLAYED ........................................................................................................... 3-7

7. SPEAKER NO AUDIO ............................................................................................................................ 3-8

8. NO BOOTING IN CD/USB FUNCTION .................................................................................................. 3-9

9. NO OPERATION OF MD ...................................................................................................................... 3-14

10. NO SOUND ........................................................................................................................................... 3-19

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-25

1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 3-25

2. SYSTEM PART ..................................................................................................................................... 3-28

3. NO AUDIO CHECK ............................................................................................................................... 3-29

4. NO LIGHTING (SPEAKER LED) .......................................................................................................... 3-34

WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-35

1. DSP (IC501) .......................................................................................................................................... 3-35

2. PWM (IC202) ........................................................................................................................................ 3-36

3. SERVO (IC401) ..................................................................................................................................... 3-37

4. MOTOR DRIVER (IC400) ..................................................................................................................... 3-38

5. ADC (IC201) .......................................................................................................................................... 3-39

6. USB (CN502) ........................................................................................................................................ 3-39

7. BLUETOOTH (CN504) .......................................................................................................................... 3-40

WIRING DIAGRAM .......................................................................................................................................... 3-41

BLOCK DIAGRAMS ........................................................................................................................................ 3-43

1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-43

2. SMPS BLOCK DIAGRAM ..................................................................................................................... 3-45

3. POWER BLOCK DIAGRAM ................................................................................................................. 3-47

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-49

1. SMPS - POWER #1 CIRCUIT DIAGRAM ............................................................................................ 3-49

2. SMPS - POWER #2 CIRCUIT DIAGRAM ............................................................................................ 3-51

3. MAIN - CD DSP CIRCUIT DIAGRAM ................................................................................................... 3-53

4. MAIN - ADC/ PWM CIRCUIT DIAGRAM .............................................................................................. 3-55

5. MAIN - RF SERVO CIRCUIT DIAGRAM .............................................................................................. 3-57

6. MAIN - EXP/ VISENSE CIRCUIT DIAGRAM ....................................................................................... 3-59

7. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-61

8. MAIN - MIC/ AUX CIRCUIT DIAGRAM ................................................................................................ 3-63

9. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-65

10. FRONT_CTRL CIRCUIT DIAGRAM ..................................................................................................... 3-67

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-69

1. CAPACITORS ....................................................................................................................................... 3-69

2. CONNECTORS ..................................................................................................................................... 3-70

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-71

1. SMPS P.C.BOARD ............................................................................................................................... 3-71

2. MAIN P.C.BOARD ................................................................................................................................ 3-75

3. FRONT P.C.BOARD ............................................................................................................................. 3-79

4. FRONT_CTRL P.C.BOARD .................................................................................................................. 3-83

3-1

Page 21

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/ FET

1-1-1. Solution

Please check and replace F901, BD901, BD902, Q902~Q905 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 or BD902 is short-circuit by over current with a digital multimeter.

3) Check if the FET Q902 ~ Q905 is normal or short.  If it is short condition, it’s destroyed. Replace it with a new one. (Please replace 4 FET at the same time although several FET is OK)

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

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

If BD901, BD902 is short-circuit,

<BD901, BD902 >

replace it with a new one.

< Q902 ~ Q905 >

If Q902 ~Q905 is short (pin1-3),

replace it with a new one.

3-2

Page 22

ONE POINT REPAIR GUIDE

2. NO AMP POWER

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

2-1. FUSE/ FET

2-1-1. Solution

Please check and replace F911, Q911 ~ Q914 on SMPS board.

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

1) Check if the fuse F911 is open or short-circuit.

2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q911~Q914 with a digital multimeter.  If it is short condition, it’s destroyed. Replace it with a new one. (Please replace 4 FET at the same time although several FET is OK)

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

< F911 >

If F911 is not short-circuit,

replace it with a same speciﬁ cations one.

< Q911 ~ Q914 >

If Q911 ~ Q914 is short-circuit,

replace it with a new one.

3-3

Page 23

ONE POINT REPAIR GUIDE

X500

(24 MHz)

X501

(32.768 kHz)

KEY2

(R526)

R522

PWR_CTRL

3. NO BOOTING WHEN POWER ON THE SET

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

3-1. IC501

3-1-1. Solution

Replace IC501 on MAIN board.

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

1) Check the 5.6 VA (CN106) and 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.

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

X501

(32.768 kHz)

KEY2

(R526)

< MAIN board top view >

R522

PWR_CTRL

X500

(24 MHz)

< MAIN board bottom view >

3-4

Page 24

ONE POINT REPAIR GUIDE

CN315

VFD_STB,

VFD_CLK,

VFD_DO

4. VFD IS NOT DISPLAYED WHEN POWER ON THE SET

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

4-1. VFD (VFD301)

4-1-1. Solution

Please check and replace VFD301 on FRONT board.

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

1) Check if 39 V, FL+ and FL- are output from SMPS to VFD via the MAIN board.

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

3) Check if the VFD grid current amplifier circuit on the FRONT board. Check the drive signal to the transistor’s base.  If the control signals from VFD (DGND_2, VH, VDD) isn’t output, replace VFD with a new one.

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

CN315

VFD_STB,

VFD_CLK,

VFD_DO

R327(TP 304) Q301 Emitter

< FRONT circuit > < Waveform of the grid current driver>

about

30 Vp-p

3-5

Page 25

ONE POINT REPAIR GUIDE

IC700~IC705

5. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

Audio signal output is small or not. when you power on the Middle Power Mini System.

5-1. AMP IC (IC700~IC705)

5-1-1. Solution

Replace IC700~IC705 on MAIN board.

5-1-2. How to troubleshoot (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 PWM 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 (TM700).

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

IC700~IC705

< MAIN board top view >

3-6

Page 26

ONE POINT REPAIR GUIDE

AMP FET

6. D-PROTECTION IS DISPLAYED

6-1. AMP FETs

6-1-1. Solution

Replace AMP FET on MAIN board.

6-1-2. How to troubleshoot (Countermeasure)

1) This symptom occurs, when DC protection is detected. Main reasons are like below.

- When some of AMP FETs dead.

6-1-3. Service hint (Any picture / Remark)

AMP FET : IRF6775

< MAIN board top view >

Notice for FET service

- In case of RF6775, Metal case, FET Drain, has electric potential. So be careful when you deal with it.

AMP FET

* You can see FET after removing heatsink. * Notice for Service

Before repair Main Assy, you need to discharge SMPS. After then, open the connector. You should try to change both of +/- FET and Driver IC as a pair.

3-7

Page 27

ONE POINT REPAIR GUIDE

CN110 pin1, 2 : +58 V pin3, 4 : PGND pin5, 6 : -58 V

pin5 of IC700

CSD

7. SPEAKER NO AUDIO

Speaker No Audio

7-1. AMP IC (IC700~IC705)

7-1-1. Solution

Replace IC700~IC705 on MAIN board.

7-1-2. How to troubleshoot (Countermeasure)

1) Check 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.

7-1-3. Service hint (Any picture / Remark)

CN110 pin1, 2 : +58 V pin3, 4 : PGND pin5, 6 : -58 V

< MAIN board top view >

pin5 of IC700 

< MAIN board top view > < MAIN - AMP circuit >

CSD

3-8

Page 28

ONE POINT REPAIR GUIDE

IC505

D500

IC500

8. NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

8-1. NO VCC33, VCC12

8-1-1. Solution

Please check and replace IC505, IC500 on MAIN board.

8-1-2. How to troubleshoot (Countermeasure)

1) Check Voltage of IC505 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 pin B2 of IC501 & R524, R522

3) If PWR_CTRL is high, check R524 and if there’s no defective component then replace IC505.

4) If 3.3 V(VCC33) is normal, check 1.2 V output(pin2) voltage of IC500  If 1.2 V of IC500 pin2 doesn’t come out, then replace IC500.

8-1-3. Service hint (Any picture / Remark)

IC500

< MAIN board top view >

IC505

D500

< MAIN board bottom view >

3-9

Page 29

ONE POINT REPAIR GUIDE

IC501

X500

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

8-2. CRYSTAL (X500)

8-2-1. Solution

Replace X500 on MAIN board.

8-2-2. How to troubleshoot (Countermeasure)

1) If 3.3 V & 1.2 V is normal, Check the CHIP_RESET of IC501 pin T12 on MAIN board.  If CHIP_RESET isn’t high, Check MICOM(IC101) pin40.

2) If CHIP_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.

8-2-3. Service hint (Any picture / Remark)

XXXII

IC501

X500

XXO

< MAIN board top view >

< Signal waveform >

X500

3-10

Page 30

ONE POINT REPAIR GUIDE

VCC

CLK

CS#

IC503

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

8-3. SERIAL FLASH (IC503)

8-3-1. Solution

Please check and replace IC503 on MAIN board.

8-3-2. How to troubleshoot (Countermeasure)

1) If the crystal(X500) does oscillate, Check Serial Flash(IC503) on MAIN board.  Check 8pin(VCC), 6pin(CLK), 1pin(CS), 2pin(DO), 5pin(DI) of below waveform.

2) If pin8, 6, 1, 2, 5 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 waveform, Check IC501(DSP IC).

8-3-3. Service hint (Any picture / Remark)

IC503

< MAIN board bottom view >

< Signal waveform >

3-11

Page 31

ONE POINT REPAIR GUIDE

V CC

Res et

address

da ta

/ CS

R AS

/ WE

CAS

IC502

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

8-4. SDRAM (IC502)

8-4-1. Solution

Please check and replace IC502 on MAIN board.

8-4-2. 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, 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).

8-4-3. Service hint (Any picture / Remark)

IC502

< MAIN board bottom view >

< Signal waveform >

3-12

Page 32

ONE POINT REPAIR GUIDE

IC501

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX  CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

8-5. DSP (IC501)

8-5-1. Solution

Please check and replace IC501 on MAIN board.

8-5-2. 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).

8-5-3. Service hint (Any picture / Remark)

R594 PGPB12 (Yellow)

R598 PAD19

IC501

(Green)

< MAIN board top view >

R597 PAD20 (Pink)

< Bootstrap waveform >

3-13

Page 33

ONE POINT REPAIR GUIDE

SP-

pin8 of CN401

SP+

pin6 of CN401

IC400

9. 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.

9-1. SPINDLE MOTOR

9-1-1. Solution

Replace IC401 or IC400 on MAIN board.

9-1-2. How to troubleshoot (Countermeasure)

1) Check the SPDO signal from pin16 of IC401.  If no signal, check 3.3 V (RF) and X400.

2) Check the SPIN- & SPIN+ from IC400 to CN401 for driving SPINDLE motor. It is about 3.6 Vp-p.  If no signal, check +7 V for IC400.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.  If the spindle motor is short-circuit or has any trouble, it can not rotate CD discs. Please check the function after changing another MD.

9-1-3. Service hint (Any picture / Remark)

zwR

zwT

< Waveform of SP- & SP+

for driving SPINDLE motor >

SP+

pin6 of CN401

SP-

pin8 of CN401

IC400

< MAIN board top view >

3-14

Page 34

ONE POINT REPAIR GUIDE

SL-

pin9 of CN401

SL+

pin7 of CN401

IC400

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.

9-2. SLED MOTOR

9-2-1. Solution

Replace IC401 or IC400 on MAIN board.

9-2-2. How to troubleshoot (Countermeasure)

1) Check the SLDO signal from pin23 of IC401.  If no signal, check 3.3 V (RF) and X400.

2) Check the SLED+ & SLED- from IC400 to CN401 for driving SPINDLE motor. It is about 2.9 Vp-p.  If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.  If the sled motor is sort-circuit or has any trouble, it can not move the pickup module. Please check the function after changing another MD.

9-2-3. Service hint (Any picture / Remark)

zsR

zsT

< Waveform of SLED- & SLED+

for driving SLED motor >

SL+

pin7 of CN401

SL-

pin9 of CN401

IC400

< MAIN board top view >

3-15

Page 35

ONE POINT REPAIR GUIDE

LO-

pin2 of CN401

LO+

pin4 of CN401 MOT_CLOSE pin6 of IC400

MOT_OPEN

pin7 of IC400

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.

9-3. TRAY OPEN/ CLOSE MOTOR

9-3-1. Solution

Replace IC401 or IC400 on MAIN board.

9-3-2. How to troubleshoot (Countermeasure)

1) Check MOT_OPEN & MOT_CLOSE signals from pin K4 & L4 of IC501 to IC400.  If no signal, check +1.8 V & + 5 V to IC400.

2) Check LOAD ± from IC400 to CN401 for driving the tray open/ close motor. It is about 3.85 Vp-p.  If no signal, check +5 V to IC401. If it has any trouble, replace it with a new one.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.  If the tray motor is short-circuit or has any trouble, it can not open or close the tray. Please check the function after changing another MD.

9-3-3. Service hint (Any picture / Remark)

svT

svROylkP

tv{  v w lu

tv{  jsvz l

< Waveform

for driving TRAY open/ close motor >

MOT_OPEN

pin7 of IC400 MOT_CLOSE pin6 of IC400

LO+

pin4 of CN401

< MAIN board top view >

LO-

pin2 of CN401

3-16

Page 36

ONE POINT REPAIR GUIDE

TR-

pin17 of CN400

TR+

pin16 of CN400

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.

9-4. LASER TRACKING ACTUATOR

9-4-1. Solution

Replace IC401 or IC400 on MAIN board.

9-4-2. 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 pin14 of IC401.  If no signal, check 3.3 V (RF) and X400.

2) Check TR- & TR+ from IC400 to CN400 for driving the tracking actuator.  If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN400 and MD.

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

9-4-3. Service hint (Any picture / Remark)

{yTGju[W[ {y RGGju[W[

< Waveform of TR±

for driving TRACKING actuator >

TR-

pin17 of CN400

pin16 of CN400

< MAIN board top view >

TR+

3-17

Page 37

ONE POINT REPAIR GUIDE

F-

pin18 of CN400

F+

pin15 of CN400

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.

9-5. LASER FOCUSING ACTUATOR

9-5-1. Solution

Replace IC401 or IC400 on MAIN board.

9-5-2. 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 FDO signal from pin13 of IC401.  If no signal, check 3.3 V (RF) and X400.

2) Check F- & F+ from IC400 to CN400 for driving the focusing actuator.  If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN400 and MD.

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

9-5-3. Service hint (Any picture / Remark)

mRGGju[W[

mT  Gju[W[

< Waveform of F±

for driving FOCUSING actuator >

F-

pin18 of CN400

pin15 of CN400

< MAIN board top view >

F+

3-18

Page 38

ONE POINT REPAIR GUIDE

D+

D-

10. NO SOUND

There is no sound output in the USB function, repair the set according to the following

10-1. USB FUNCTION

10-1-1. Solution

Replace IC501 on MAIN board, IC312 on FRONT board.

10-1-2. How to troubleshoot (Countermeasure)

1) Check +5 VU to FRONT board.

 if +5.6 VA to pin2 of IC312(LDO) doesn’t come out, check pin4 & 5 of CN314.  if +5.6 VA is normal & +5 VU of IC312 pin3 doesn’t come out, then replace IC312.

2) Check “Digital audio AMP block”.

10-1-3. Service hint (Any picture / Remark)

D-

guide.

< USB function signal ﬂ ow >

USB D+/D (CN502 pin5, 6, 8, 9) < Waveform of USB D± signal >

3-19

Page 39

ONE POINT REPAIR GUIDE

IC201

ADC/MIC_DATA to R212 MCS_BCK to R213 MCS_LRCK to R215 MCS_MCLK to R216

AUX_R to R209

AUX_L to R210

NO SOUND

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

10-2. AUX FUNCTION

10-2-1. Solution

Replace IC201 on MAIN board.

10-2-2. 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/MIC_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 IC501 to IC202.  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.

10-2-3. Service hint (Any picture / Remark)

AUX_L/R

ADC/MIC_DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

MCS_MCLK

MLC3730

IC201

CS5346

IC501

< AUX function signal ﬂ ow >

AUX

IC202

PS9860

PWM

IR AMP

IRS2092+IRF6775

AUX_R to R209

AUX_L to R210

ADC/MIC_DATA to R212 MCS_BCK to R213 MCS_LRCK to R215 MCS_MCLK to R216

< MAIN board bottom view >

IC201

3-20

Page 40

IC201

PT_L/R

ONE POINT REPAIR GUIDE

{

NO SOUND

There is no sound output in the PORT. IN function, repair the set according to the following guide.

10-3. PORT. IN FUNCTION

10-3-1. Solution

Replace IC201 on MAIN board.

10-3-2. How to troubleshoot (Countermeasure)

1) Check PT_L/R signal from FRONT board to MAIN board.

2) Check if PT_LR is entered pin25 & 27 of CN605  pin25 & 27 of CN315.

3) Check PT_L/R signals to IC201(pin9, 10).

4) Check if ADC_BCK, ADC_LRCK & DAC_MCLK are entered from IC501 to IC201.

5) 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.

6) Check the following I2S signal flow from IC501 to IC202.  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.  If AMP is damaged, replace it with a new one.

10-3-3. Service hint (Any picture / Remark)

IC202

PS9860

PWM

POT. IN

MCS_MCLK

MLC3730

{TG

IC201

CS5346

IC501

POT_L/R

ADC/MIC_DATA

MCS_LRCK

MIX_DATA_OUT

MCS_BCK

VOLUME

Board

< PORT. IN function signal ﬂ ow >

IR AMP

IRS2092+IRF6775

IC201

PT_L/R

< MAIN board bottom view >

3-21

Page 41

ONE POINT REPAIR GUIDE

{

IC201

ADC/MIC_DATA to R212 MCS_BCK to R213 MCS_LRCK to R215 MCS_MCLK to R216

TUNER_L/R

NO SOUND

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

10-4. TUNER FUNCTION

10-4-1. Solution

Replace IC201, TU500 on MAIN board.

10-4-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_L/R 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, GPO2) are entered from IC501 to TU500.

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

2) Check if ADC_BCK, ADC_LRCK & DAC_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 audio signal flow from IC501 to IC202.  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.

10-4-3. Service hint (Any picture / Remark)

{TG

MCS_MCLK

MLC3730

IC201

CS5346

IC501

TUNER_L/R

ADC/MIC_DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

Jack

Board

IC202

PS9860

PWM

< TUNER function signal ﬂ ow >

TUNER

IR AMP

IRS2092+IRF6775

ADC/MIC_DATA to R212 MCS_BCK to R213 MCS_LRCK to R215 MCS_MCLK to R216

< MAIN board bottom view >

TUNER_L/R

IC201

3-22

Page 42

ONE POINT REPAIR GUIDE

IC206

 

  

 MCS_MCLK. pin6  MCS_LRCK. pin7  MCS_BCK. pin8  MIC_DATA_IN. pin9  MIC_OUTPUT. pin14

NO SOUND

There is no sound output in the MIC IN function, repair the set according to the following guide.

10-5. MIC IN FUNCTION

10-5-1. Solution

Replace IC200, IC206 on MAIN board.

10-5-2. How to troubleshoot (Countermeasure)

1) Check MIC_SIG signal to pin33 of CN605.  If no signal, Check the signal to pin33 of CN315 on the FRONT board. Check if the signal is entered from pin6 of CN605 to MAIN board.

2) Check if MIC_SIG is entered from pin33 of CN605 to pin3 to IC200 (MIC AMP).

3) Check if the amplified signal comes out from pin4 of IC200.  If no signal output, check +12 V for IC200, replace IC200 with a new one if it has a problem.

4) Check if MCS_BCK, MCS_MLCK & MCS_LRCK is entered from IC501 to IC206. Check if MIC_DATA_IN is entered from pin9 of IC206 to pin T1of IC501.  If no signal, check +5 V & +3.3 V for IC206. If it is abnormal, change replace it a new one.

5) Check the following I2S signal flow from IC206 to IC501.  If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.

6) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

10-5-3. Service hint (Any picture / Remark)

MIC IN

IR AMP

IRS2092+IRF6775

PCM1808

MCS_MCLK

IC206

MIG_SIG

ADC/MIC_DATA

IC501

MLC3730

< MIC IN function signal ﬂ ow >

IC200

S4308

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

IC202

PS9860

PWM

MIC

Board

  

IC206

MCS_MCLK. pin6 MCS_LRCK. pin7 MCS_BCK. pin8 MIC_DATA_IN. pin9 MIC_OUTPUT. pin14

< MAIN board top view >

 

3-23

Page 43

ONE POINT REPAIR GUIDE

CN504

BT_RX. pin6

BT_TX. pin4

NO SOUND

There is no sound output in the Bluetooth function, repair the set according to the following guide.

10-6. BLUETOOTH FUNCTION

10-6-1. Solution

Replace IC501 on the MAIN board or B/T module on the Front Panel.

10-6-2. 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 K1, L1 to IC501 (DSP).

3) 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.

4) Check if the digital audio AMP block is okay.  If AMP is damaged, replace it with a new one.

10-6-3. Service hint (Any picture / Remark)

B/T Module

BT_RX, BT_TX

IC501

MLC3730

MCS_BCK

MCS_LRCK MIX_DATA_OUT

< Bluetooth function signal ﬂ ow >

IC202

PS9860

PWM

IR AMP

IRS2092+IR F6775

BT_TX. pin4

BT_RX. pin6

< MAIN board top view >

CN504

3-24

Page 44

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No output 5.6 VA

Is the F901 normal?

YES

Is BD901 or BD902 normal?

YES

Is the VCC

(11 V ~ 25 V) supplied to IC901

pin4?

YES

Power line of MAIN PCB is short.

Replace F901 (same fuse).

Replace BD901 or BD902.

Is D960/ D961 normal?

Check or replace D960/ D961.

No 12 V

VCC 13 VA supplied to IC951

Check and replace IC951.

Or check line of

Is the

pin2?

YES

Is there

‘H’ signal at IC951

pin1?

YES

MAIN PCB is short or not.

Check or replace D962.

Check P_CTL from μ-com.

3-25

Page 45

ELECTRICAL TROUBLESHOOTING GUIDE

No -5 V

VCC -7 VA supplied to IC953

Is the

pin2?

YES

Is there

‘H’ signal at Q953

Base?

YES

Check or replace Q953, Q957.

Or check line of MAIN PCB is short or not.

No output AMP gate line

Is the R965 normal?

YES

Check or replace Q951.

Check P_CTL

from μ-com.

Check or replace R965, D959.

Is the VCC

14 VA supplied to IC952

pin1 to pin3?

Check and replace IC952.

Or check line of MAIN PCB is short or not.

Is the R952 normal?

YESYES

Check or replace D951, D952.

3-26

Check or replace R952.

Page 46

ELECTRICAL TROUBLESHOOTING GUIDE

No AMP output

Is the

C903, C913 Voltage

about 395 V?

YES

Is F911 normal?

YES

Is the

PFC P.CTL OK?

YES

Is the

VCC 12 V supplied to

IC904 pin16?

YES

Check or replace

IC904, Q907 ~ Q910.

Is the

AMP P.CTL OK?

YES

Is the

VCC 12 V supplied to

IC902 pin8?

Check PFC P.CTL

from μ-com.

Replace D908, Q955, PC903.

Check AMP P.CTL

from μ-com.

Replace D908, Q956, PC902.Replace F911.

Q911 ~ Q914 OK?

Replace Q911 ~ Q914.

YES

Check or replace IC902 and

Check Q911 ~ Q914 gate(pin2)

Components (Resistors, Diodes).

3-27

Check or replace D953 ~ D956.

Check line of MAIN PCB is short or not.

Page 47

ELECTRICAL TROUBLESHOOTING GUIDE

2. SYSTEM PART

Power on.

“HELLO”

Display on MLD

OK?

YES

Top LED

(LD311, LD313),

(LD301, LD303)

Turn on?

YES

CN605

cable connection

OK?

YES

CN605

pin14, 15, 16, 24 power

OK?

YES

CN605

pin8, 9, 10 data signal

OK?

YES

CN605 pin24

+12 V OK?

YES

Check FFC cable.

Check SMPS board.

Check MAIN board.

Replace VFD301.FL+/- & VKK voltage OK?

Check SMPS board.

When turn

the volume, count is

change?

YES

System part OK.

Replace LED

(LD311, LD313),

(LD301, LD303)

Check

CN605 pin5, 6

I2C data OK?

YES

Check MAIN board.

3-28

Check FFC cable.

Page 48

ELECTRICAL TROUBLESHOOTING GUIDE

3. NO AUDIO CHECK

CD FUNCTION

Can

disc insert?

YES

Disc reading OK?

YES

LOAD +, - OK?

YES

Is motor impedance

about 12 Ω?

OPU driving

(Focusing & Tracking) OK?

Check OPU.

(Pick-up module)

Is Motor_open/ close OK?

(IC400 pin6, 7)

YES

Check IC501.

Check loading motor.

Check IC400.

Focusing/

Tracking/ Sled signal

OK?

YES

MON_MPD(CN400 pin22)

About 180 mV?

IC401 pin34, 35, 36

I2S output signal OK?

YES

IC501 pin N1, N2, N4

I2S input signal OK?

YES

IC401

RF & Servo signal

OK?

YES

Check IC501.

3-29

Check FFC cable

to CN400, CN401.

Page 49

ELECTRICAL TROUBLESHOOTING GUIDE

USB FUNCTION

When insert USB,

IC501 pin U7, U8, A7, A8

USB_D signal OK?

YES

AUX FUNCTION

IC312 USB Power

+5 VU OK?

YES

Replace IC312.

pin23, 24 AUX input signal

IC201

OK?

YES

IC201

pin42, 43, 44 I2S input signal

OK?

YES

IC201

pin41 ADC_DATA_IN output

signal OK?

YES

Check audio cable.

Check IC501.

Replace IC201.

3-30

Page 50

ELECTRICAL TROUBLESHOOTING GUIDE

PORTABLE FUNCTION

pin9, 10 PT_L/R input signal

IC201

OK?

YES

IC201

pin42, 43, 44 I2S input signal

OK?

YES

IC201 pin41

ADC_DATA_IN output signal

OK?

YES

TUNER FUNCTION

Check FRONT board.

Check IC501.

Replace IC201.

IC201 pin26, 27

TUNER_L/R input signal

OK?

YES

IC201

pin42, 43, 44 I2S input

signal OK?

YES

IC201

pin41 ADC_DATA_IN output

signal OK?

YES

TU500

TUNER_L/R output

signal OK?

YES

Check IC501.

Replace IC201.

3-31

Check +3.3 V of TU500.

Page 51

ELECTRICAL TROUBLESHOOTING GUIDE

YES

pin D1, D2, E1 I2S Clock signal

IC501

OK?

YES

IC501

pin E2 I2S data signal

OK?

YES

IC202

PWM data output signal

OK?

YES

Check IC501.

Replace IC202.

3-32

Page 52

ELECTRICAL TROUBLESHOOTING GUIDE

pin47~50

of IC202, FL/FR± signal

OK?

YES

IC203, IC204

FL/FR audio signal OK?

YES

pin13 of

IC700, IC701, IC702, IC703

FL/FR audio signal OK?

YES

Check IC202.

Check IC203, IC204.

Check IC700, IC701,

IC702, IC703.

Check IC202.

Check IC205.

Check IC705.

pin45, 46 of IC202,

SW1± signal OK?

YES

IC205

SW1 audio signal OK?

YES

pin13 of IC705

SW1 audio signal OK?

YES

±66 V, -12 V, ±5 V

Power voltage OK?

YES

Q707, Q708, Q711, Q712, Q713,

Q705, Q706,

Q714 OK?

YES

Check Q705, Q706, Q707,

Q708, Q711, Q712, Q713, Q714.

Check SMPS.

Check Q717, Q718.

Check speaker cable connection.

3-33

Check SMPS.

±66 V, -12 V, ±5 V

Power voltage OK?

YES

Q717, Q718

OK?

YES

Page 53

ELECTRICAL TROUBLESHOOTING GUIDE

4. NO LIGHTING (SPEAKER LED)

Power on

White is turn on?

YES

IC601 LED_5V

OK?

YES

Check speaker.

Check Q610~Q618, Q1103~Q1105.

Check IC601.

3-34

Page 54

WAVEFORMS OF MAJOR CHECK POINT

1. DSP (IC501)

Fig 1-1. Crystal of RTC 32.768 MHz

(R5D6) X501

Fig 1-2. Crystal of system 24 MHz

( Main DSP : R508,R509) X500

3-35

Page 55

2. PWM (IC202)

Fig 2-1. Crystal 24.576 MHz

(IC202 pin4, 5) X200

Fig 2-2. DSP to PWM I2S

IC202 pin26~30

7 8

6 5

3-36

Page 56

3. SERVO (IC401)

Fig 3-1. Crystal 16.9344 MHz

(X400)

Fig 3-2. CD-16M

(IC401 pin31)

3-37

Page 57

4. MOTOR DRIVER (IC400)

Fig 4-1.

LO- & LO+ / MOT_OPEN & MOT_CLOSE

for Driving TRAY Motor

(IC400 pin6, 7, 9, 10)

Fig 4-2. SL- & SL+ for Driving SPINDLE Motor

(IC400 pin11, 12)

Fig 4-3. SP- & SP+ for Driving SPINDLE Motor

(IC400 pin17, 18)

1614

1513

1817

2019

3-38

Page 58

5. ADC (IC201) 6. USB (CN502)

Fig 5. ADC I2S

(IC201 pin42, 43, 44)

Fig 6. USB D+/ D-

(CN502 pin5, 6, 8, 9)

3-39

Page 59

7. BLUETOOTH (CN504)

BT_TX

BT_RX

BT_RST

BT_TX

BT_RX

BT_RST

BT_TX

BT_RX

BT_RST

Fig 7. BT_TX / BT_RX / BT_RST

(CN504 pin4, 6, 9)

3-40

Page 60

3-41 3-42

MAIN

33P, 1.25mm

10P, 1mm

6P, 3.96mm

15P, 2.5mm

10P, 1.25mm

FRONT FRONT_CTRL

6P, 2mm

SMPS

6P, 3.96mm

15P, 2.5mm

VFD

Portable MIC

33P, 1.25mm

10P, 1.25mm

Harness

FFC

WIRING DIAGRAM

Page 61

3-43 3-44

BLOCK DIAGRAMS

1. SYSTEM BLOCK DIAGRAM

(±5 V)

(±57 V)

DRIVER

IRS2092

OP AMP AZ4580

FET

IRF6775

DRIVER

IRS2092

OP AMP AZ4580

FET

IRF6775

DRIVER

IRS2092

OP AMP AZ4580

FET

IRF6775

DRIVER

IRS2092

OP AMP AZ4580

FET

IRF6775

DRIVER

IRS2092

OP AMP AZ4580

FET

IRF6775

MLC3730 Main DSP

(+ 3.3 V_CD, VCC1.2)

DDECK

MECHANISM

P/UP

(VCC50)

FRONT

Receiver

VFD

DIG311

Volume/

Key/switch

(+ 3.3 VA ,+ 12 V )

16 MB(128 Mb)

SDRAM

8 MB(64 Mb)

S/Flash

AM5890

Motor Drive

USB1

USB2

SERVO

BU9546

(4X Speed)

IC201

ADC

CS5346

PRE,AMP

S4308

DAC

PCM5101

PS9860

PWM

E2PROM

CLK/DAT

DRM_WEN/CAS/

RAS/SEL/CLK/CKE

Speaker Lighting

AMP_OSC

ADC_DATA

MCS_BCK/LRCK/MCLK

EEPROM

IR_IN_RL

RL_OUT_P/N

FL_OUT_P/N

SW_OUT_P/N

RR_OUT_P/N

FR_OUT_P/N

M00_15 A00_16

SF_DI/DO

SF_CS/SCK

VFD_STB/CLK/DO/RST,

VKK,FL+/ -

RMC

MAIN VOL_A/B ,

KEY 1/2

OP_SW,CL_SW,UP_SW,DN_SW,D_SENSE

MOT_MUTE,CLOSE,OPEN

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

SPDO/SLDO

/FOD/TRD

LOAD±,SLED±,

SPIN±,TR±,F±

D2S+/ -

IR_IN_FL

IR_IN_SW

IR_IN_RR

IR_IN_FR

PWM_LRCK/BCK/DATA

DSP_O_DATA

AUX_DATA

EXP_DATA

MCS_BCK/LRCK, MCLK

CD_RW/ MCLK/ LRCK/BCK,

CD_DAT

CD_RST

UART_RX/TX

For AUX

For MIC

PGPC08

1.1 2.0

IC101

Micom

PCM1808

SCRATCH A/B,

M_VOL_A/B,

FAN_CTRL /2,

Search_A /B,EQ HIGH/LOW

DRV632

Page 62

3-45 3-46

2. SMPS BLOCK DIAGRAM

Digital

Power

AMP

F_L

F_R

SW_L

SW_R

AC Line

Filter Block

(Varistor,

X-Cap

Line Filter

Thermistor)

Pulse Trans

Half Bridge

LLC

Resonant IC

(ICE1HS01G)

FET

13 A

600 V

4 EA

14 VA

5.6 VA

+PVDD

(58 V)

MAIN SMPS

(STR-2A153D)

Flyback

MAIN

TRANS

u-com / BT

USB / MPEG

FAN/Mic/

Relay

PFC

P- CTRL

Half

Bridge

LLC

TRANS

(AMP)

- 5 V

-PVDD

(-58 V )

GATE

Half

Bridge

LLC

TRANS

(AMP)

Gate

Drive

2.2 CH 3000 W

OPAMP

AMP

P- CTRL

Totem

pole

PFC IC

(R2A20112A)

Interleaved

CRM

FET

20 A

600 V

4 EA

Gate

Drive

PFC Out

(395 V)

On/Off

Vcc

On/Off

Relay

LED, VFD

Motor Drive

12 V

Page 63

3-47 3-48

3. POWER BLOCK DIAGRAM

+14 VA

SMPS

+5.6 VA

TUNER

IC504

EEPROM

W25Q80D

IC501

MAIN DSP

MLC3730S

IC502

SDRAM

W9812G6

IC604

DRV632

+1.2 VA

IC503

FLASH

W25Q64

IC507

LDO(1 A)

AZ1117

IC601

LDO(1 A)

LM37102D

+3.3 VA

VFD

25 mA

+LED_5 V

370 mA

IC602

PCM5101

VKK

FL ±±

2mA

IC207

LDO(1 A)

LM37102D

IC505

LDO(1 A)

TJ4220GDP

IC103

P-SENSE

AZ7027

IC102

Chip Reset

AZ7027

DVCC_3.3 V

→MCS_3.3 V

IC101

MICOM

R5F100G

+58 V

-5 V

-58 V

-B+12 V

555.2 mA

RTC3.0

IC500

DCDC(3 A)

TPS5632

+12 V

IC202

PWM

PS9860

IC401 RF IC

BU9546

IC508

LDO

AZ1117

Option

+4.8 VA

Bluetooth

+5 V_AMP

IC203~5

IC802,IC1000~1

OP AMP * 6

AZ4580

IC700~5

IRS2092 * 6

AMP IC

IC203~5

IC802,IC1000~1

OP AMP * 6

AZ4580

IC700~5

IRS2092 * 6

AMP IC

IRF6775M * 12

FET

IC600

TPS54331

+9 V

IC200

S4308

IC201

CS5346

FAN*2

GREEN

LED(4 EA)

BLUE

LED(4 EA)

IC312

A278R05

RMC

RC311

IC311

VFD

2 mA

80 mA 10 mA

38 mA

70 mA

22 mA

5 mA6 mA

230 mA*2

2 mA

20 mA 2 mA

160 mA

20 mA

80 mA

15 mA

PICK UP

80 mA

350 mA

250 mA

110 mA

45 mA 110 mA

77 mA 3.2 mA

34.2 mA

83 mA

340 mA

155 mA

902 mA

35 mA

1 mA

145 mA

1 A

+5 V / 1 A

MCS_3.3 V

Expander

BU2090F

10 mA

225 mA

IC402

TPS54328

DVCC_5 V

IC400

AM5890

RED

LED(4 EA)

IC206

PCM1808

IC1000/1

AZ4580

SW1000/1

NLASB315

VI SENSE

LED*4

Page 64

3-49 3-50

CIRCUIT DIAGRAMS

1. SMPS - POWER #1 CIRCUIT DIAGRAM

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.

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.

IMPORTANT SAFETY NOTE :

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

SMPS 1/2

EAX66225601_1.5(5)-SD(#1)

2014. 12. 22

CAUTION:

Danger if fuse is incorrectly replaced.

Replace only with the type identical to fuse rating

and(or) model name described in main label.

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

No Power

BD901 or BD902 is Defective

No Power

Q902 ~ Q905 are Defective

No Power

F901 is Defective

Page 65

3-51 3-52

2. SMPS - POWER #2 CIRCUIT DIAGRAM

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.

IMPORTANT SAFETY NOTE :

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

SMPS 2/2

EAX66225601_1.5(5)-SD(#2)

2014. 12. 22

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

No Power

F911 is Defective

No Power

Q911 ~ Q914 are Defective

Page 66

3-53 3-54

3. MAIN - CD DSP CIRCUIT DIAGRAM

: WAVEFORM NUMBER

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

CD DSP

EAX66215801_1.7(22)-SD(#1)

2015. 01. 07

Page 67

3-55 3-56

4. MAIN - ADC/ PWM CIRCUIT DIAGRAM

7 8

6 5

: WAVEFORM NUMBER

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

ADC/ PWM

EAX66215801_1.7(22)-SD(#2)

2015. 01. 07

Page 68

3-57 3-58

5. MAIN - RF SERVO CIRCUIT DIAGRAM

1614

1513

2019

1817

: WAVEFORM NUMBER

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

RF SERVO

EAX66215801_1.7(22)-SD(#3)

2015. 01. 07

Page 69

3-59 3-60

6. MAIN - EXP/ VISENSE CIRCUIT DIAGRAM

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

EXP/ VISENSE

EAX66215801_1.7(22)-SD(#4)

2015. 01. 07

Page 70

3-61 3-62

7. MAIN - AMP CIRCUIT DIAGRAM

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

AMP

EAX66215801_1.7(22)-SD(#5)

2015. 01. 07

Page 71

3-63 3-64

8. MAIN - MIC/ AUX CIRCUIT DIAGRAM

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

MIC/ AUX

EAX66215801_1.7(22)-SD(#6)

2015. 01. 07

Page 72

3-65 3-66

9. FRONT CIRCUIT DIAGRAM

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

FRONT

EAX66215203_1.0(1)-SD

2015. 01. 21

Page 73

3-67 3-68

10. FRONT_CTRL CIRCUIT DIAGRAM

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

CTRL_A

EAX66233401_1.7(22)-SD

2015. 01. 07

Page 74

CIRCUIT VOLTAGE CHART

1. CAPACITORS 2. CONNECTORS

3-69 3-70

Location

Value

Capacitor

(uF)

Voltage_Spec

100 V-10 %

240 V/50 Hz+10 %

Measured

voltage

Measured

voltage

SMPS Board

C904 330 uF 45 0V 395 V 395 V

C911 100 uF 50 V 13.5 V 13.8 V

C930 68 uF 450 V 138 V 336 V

C932 22 uF 50 V 14 V 14.5 V

C936 1000 uF 16 V 5.65 V 5.68 V

C956 470 uF 16 V 5.1 V 5.08 V

C957 100 uF 16 V -5 V -5 V

C958 100 uF 16 V 12 V 12 V

C964 220 uF 25 V 11.99 V 11.98 V

C966 2200 uF 80 V 66.5 V 66.5 V

C968 2200 uF 80 V 66.5 V 66.5 V

No Pin Pin Name Spec. Input Voltage Output Voltage

SMPS <-> MAIN CN901 (SMPS) CN106 (MAIN)

5 -5 V -5 -4.98 -4.96

7,8 +5.6 V 5.6 5.63 5.64

11 14 VA 14 12.86 12.68

12 12 V 12 11.91 11.84

14 -B (-PVDD) -58 -58 -58.1

15 GATE -54 -54.11 -54.13

SMPS <-> MAIN CN902 (SMPS) CN110 (MAIN)

1,2 +B (+PVDD) 58 65.81 65.81

5,6 -B (-PVDD) -58 -66.08 -66.08

FRONT <-> MAIN CN315 (FRONT) CN605 (MAIN)

7 FL- -25 -24.84 -24.87

14 VKK -27 -27.14 -27.15

15 FL+ -22 -22.46 -22.45

16 3.3V 3.3 3.37 3.35

24 12V 12 11.83 11.87

MAIN <-> FRONT (USB) CN502 (MAIN) CN314 (FRONT)

2,3 5.6 VA 5.6 5.64 5.64

MAIN <-> BT Module CN504 (MAIN) BT Module

10 3.3 VA 3.3 3.329 3.329

MAIN <-> Pick-up (MD) CN400 (MAIN) MD

8 DVCC_5V 5 5.01 5.01

MAIN <-> FAN Module

CN603, CN604

(MAIN)

FAN Module

1 12 V 12 11.83 11.85

FRONT <-> CTRL_A CN311 (FRONT)

CN301

(CONTROL)

6 12 V 12 11.82 11.82

Location

Value

Capacitor

[u]

SPEC

[V]

-20 %

(88 V, 60 Hz)

+20 %

(288 V, 60 Hz)

Voltage [V] Voltage [V]

C209 4.7 u 50 V 2.02 2.02

C226 100 u 16 V 11.31 11.32

C231 100 u 16 V 5.00 5.00

C238 220 u 16 V 3.30 3.30

C240 220 u 6.3 V 1.26 1.26

C308 47 u 16 V 5.21 5.21

C344 47 u 16 V 5.01 5.01

C345 47 u 16 V 5.64 5.64

C347 470 u 10 V 3.37 3.38

C402 100 u 16 V 5.00 5.00

C404 47 u 16 V 3.32 3.32

C409 47 u 16 V 3.32 3.32

C416 47 u 16 V 1.66 1.66

C418 3.3 u 50 V 0.52 0.51

C427 220 u 16 V 8.73 8.73

C501 220 u 10 V 3.23 3.23

C5C9 1000 u 6.3 V 3.35 3.36

C5E1 47 u 16 V 3.36 3.35

C604 47 u 16 V 5.12 5.12

C622 470 u 16 V 2.77 2.77

C627 47 u 50 V 27.04 27.09

C707 1000 u 80 V 65.84 65.84

C728 1000 u 80 V 65.56 65.58

C752 2200 u 80 V 65.98 65.98

C798 2200 u 16 V 66.08 66.08

C904 330 u 450 V 394.50 394.50

C926 47 u 50 V 15.72 15.74

C927 47 u 50 V 17.10 17.20

C936 1000 u 16 V 5.65 5.65

C937 2200 u 16 V 5.66 5.66

C944 470 u 25 V 12.64 12.70

C948 220 u 25 V 7.00 6.92

C958 100 u 16 V 11.83 11.84

C963 1000 u 25 V 16.17 16.18

C964 220 u 25 V 11.81 12.02

C966 1000 u 80 V 66.10 66.07

C968 1000 u 80 V 65.58 65.84

Page 75

3-71 3-72

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD

(TOP VIEW)

Page 76

3-73 3-74

SMPS P.C.BOARD

(BOTTOM VIEW)

NOTE) Warning

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

Page 77

3-75 3-76

2. MAIN P.C.BOARD

(TOP VIEW)

Page 78

3-77 3-78

MAIN P.C.BOARD

(BOTTOM VIEW)

Page 79

3-79 3-80

3. FRONT P.C.BOARD

(TOP VIEW)

Page 80

3-81 3-82

FRONT P.C.BOARD

(BOTTOM VIEW)

Page 81

3-83 3-84

4. FRONT_CTRL P.C.BOARD

(TOP VIEW)

(BOTTOM VIEW)

LG CM9750 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual