LG CM9550 Schematic

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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

JULY, 2015P/NO : AFN77277004

MODEL:

CM9550

(CM9550, NS9550F/W)

MODEL: CM9550 (CM9550, NS9550F/W)

Mini Hi-Fi System

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CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

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

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SECTION 1

SUMMARY

CONTENTS

SERVICING PRECAUTIONS ................................................................................................................... 1-3

ESD PRECAUTIONS .................................................................................................................................. 1-5

HIDDEN KEY MODE................................................................................................................................... 1-6

SERVICE INFORMATION FOR EEPROM .......................................................................................... 1-7

PROGRAM DOWNLOAD & UPDATE GUIDE ................................................................................... 1-8

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

1-2

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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

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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

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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.

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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)

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SERVICE INFORMATION FOR EEPROM

POWER ON

It is possible at any function.

FLD “NO DISC” status

Remote control ‘ ’ + Front ‘STOP’ push same timing during 5 seconds.

FLD “op0-…..”

Move to appropriate position and

make changes with remote control.

( , , , REPEAT)

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

Press STOP key

FLD “WRITE OK”

Remote control ‘ ’ +

Front ‘STOP’ push same timing.

FLD “e2p clr”

Completed

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PROGRAM DOWNLOAD & UPDATE GUIDE

1. AUDIO PROGRAM

Download program file name must be MICOM_CM9550_YYMMDDX.HEX

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. 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

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2. CD PROGRAM

Download program file name must be HG580_CM9550_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.



MCS UP



FINISH



Auto POWER OFF

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3. DEMO PROGRAM

Download program file name must be DEMO_DAT.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.



DEMO UP



FINISH



Auto POWER OFF

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4. 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

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SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label. Power consumption Refer to the main label. Dimensions (W x H x D) (290 x 349 x 370) mm Net Weight (Approx.) 5.9 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 mm stereo jack) MIC 27 mV

• TUNER

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

• CD

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

• AMPLIFIER

Stereo mode 470 W x 2 (THD 20 %) Surround mode Front 470 W x 2 (THD 20 %) Surround 470 W x 2 (THD 20 %) Subwoofer 460 W x 2 (THD 20 %)

• FRONT SPEAKER

Type 2 Way 2 Speaker Impedance 6 Ω Rated Input Power 470 W Max. Input power 940 W

• SURROUND SPEAKER

Type 1 Way 1 speaker Impedance 6 Ω Rated Input Power 470 W Max. Input power 940 W Net Dimensions (W x H x D) (425 x 505 x 351) mm Net Weight 13.2 kg

• SUBWOOFER

Type 1 Way 1 speaker Impedance 6 Ω Rated Input Power 460 W Max. Input power 920 W Net Dimensions (W x H x D) (425 x 505 x 354) mm Net Weight 12.7 kg

• Design and specifications are subject to change without notice.

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SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

1. CABINET AND MAIN FRAME SECTION (CM9550) ................................................................................ 2-3

2. MECHANISM DECK SECTION (DP17TM2) ............................................................................................ 2-5

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

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

2-1

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2-2

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EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (CM9550)

443

FRONT

A43

MAIN

SMPS

266

A46

267

443

252

251

252

253

A42

A47

443

268

270

269

300

272

271

443

B/T

A52

CABLE4

A44

259

MIC & PTB

443

CABLE3

CABLE1

CABLE2

291

NFC Tag

A56

NOTES) THE EXCLAMATION POINT WITHIN AN

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

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2. MECHANISM DECK SECTION (DP17TM2)

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

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3. PACKING ACCESSORY SECTION

801 Owner’s Manual

836A Rubber Foot (Rear)

836L Rubber Foot (Left)

836R Rubber Foot (Right)

825 FM Wire Antenna

808 Battery

900 Remote Control

803 Packing

804 Bag

803 Packing

802 Box

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4. SPEAKER SECTION

4-1. FRONT SPEAKER (NS9550F)

• LEFT SPEAKER

A60L

A61

LED SUB

A62

652

651

LED

MAIN

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FRONT SPEAKER (NS9550F)

• RIGHT SPEAKER

A60R

A61

LED SUB

A62

652

651

LED

MAIN

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4-2. SUBWOOFER SPEAKER (NS9550W)

A90

A91

952

951

LED SUB

LED

MAIN

A92

952

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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 BOOTING IN CD/USB FUNCTION ..................................................................................................3-6

5. NO OPERATION OF MD (DRIVING THE SERVO MOTORS) ............................................................3-11

6. NO SOUND ...........................................................................................................................................3-16

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT ........................................................................ 3-22

8. NO POWER ON (STANDBY LED IS BLINKING) ................................................................................. 3-23

9. SPEAKER NO AUDIO ..........................................................................................................................3-24

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

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

2. SYSTEM PART .....................................................................................................................................3-29

3. NO AUDIO PART ..................................................................................................................................3-30

4. NO LIGHTING (WOOFER SPEAKER) ................................................................................................. 3-35

WAVEFORMS OF MAJOR CHECK POINT ....................................................................................................3-36

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

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

1. SMPS BLOCK DIAGRAM .....................................................................................................................3-43

2. MAIN SYSTEM BLOCK DIAGRAM ......................................................................................................3-45

3. MAIN 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 - RF / SERVO CIRCUIT DIAGRAM ............................................................................................ 3-55

5. MAIN - ADC / PWM CIRCUIT DIAGRAM ............................................................................................. 3-57

6. MAIN - AMP CIRCUIT DIAGRAM.........................................................................................................3-59

7. FRONT VOLUME CIRCUIT DIAGRAM ................................................................................................ 3-61

8. MIC & PORTABLE CIRCUIT DIAGRAM ..............................................................................................3-63

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

10. FRONT SPEAKER SUB CIRCUIT DIAGRAM ...................................................................................... 3-67

11. WOOFER SPEAKER MAIN CIRCUIT DIAGRAM ................................................................................3-69

12. WOOFER SPEAKER SUB CIRCUIT DIAGRAM .................................................................................. 3-71

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-73

1. CONNECTORS .....................................................................................................................................3-73

2. CAPACITORS .......................................................................................................................................3-74

PRINTED CIRCUIT BOARD DIAGRAMS .......................................................................................................3-75

1. SMPS P.C.BOARD (TOP VIEW) .......................................................................................................... 3-75

2. SMPS P.C.BOARD (BOTTOM VIEW) .................................................................................................. 3-77

3. MAIN P.C.BOARD (TOP VIEW) ...........................................................................................................3-79

4. MAIN P.C.BOARD (BOTTOM VIEW) ...................................................................................................3-81

5. FRONT VOLUME & MIC & PORTABLE P.C.BOARD (TOP VIEW).....................................................3-83

6. FRONT VOLUME & MIC & PORTABLE P.C.BOARD (BOTTOM VIEW).............................................3-85

7. FRONT SPEAKER MAIN/SUB & WOOFER SPEAKER MAIN/SUB P.C.BOARD (TOP VIEW) ..........3-87

8. FRONT SPEAKER MAIN/SUB & WOOFER SPEAKER MAIN/SUB P.C.BOARD (BOTTOM VIEW) ..3-87

3-1

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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 / THERMISTOR

1-1-1. Solution

Please check and replace F901, BD901, TH900, TH901 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 TH900, TH901 is normal or open.

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

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

If BD901 is short-circuit,

replace it with a new one.

< BD901 >

3-2

< TH900, TH901 > If TH900, TH901 is open, replace it with a new one.

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ONE POINT REPAIR GUIDE

NO POWER

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

1-2. NO AMP POWER

1-2-1. Solution

Please check and replace F911, Q905, Q906 on SMPS board.

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

1) Check if the fuse F901 is open or short-circuit.

2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q905, Q906 with a digital multi-meter.  If it is short condition, it’s destroyed. Replace it with a new one.

(Please replace 2 FET at the same time although several FET is OK)

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

< F911 >

If F911 is not short-circuit,

replace it with a same speciﬁ cations one.

< Q905, Q906 >

If Q905, Q906 is short-circuit,

replace it with a new one.

3-3

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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. MICOM (IC501)

2-1-1. Solution

Please check and replace IC501 on MAIN board.

2-1-2. 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.

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

KEY1

(pin16)

X501

(32.768 KHz)

X500

(24 MHz)

PW R_ CTRL

(R5F7)

< MAIN board top view >

3-4

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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 (DIG300)

3-1-1. Solution

Please check and replace DIG300 on FRONT board.

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

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

2) Check if the IC501 outputs VFD_RST, VFD_CLK, VFD_CS and VFD_DO to the front board.

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

VFD_RST

VFD_CS

VFD_CLK

VFD_DO

3-5

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ONE POINT REPAIR GUIDE

4. 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.

4-1. NO VCC33, VCC12

4-1-1. Solution

Please check and replace IC505, IC509 on MAIN board.

4-1-2. 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 pinB2 of IC501 & R524, R5F7.

3) If PWR_CTRL is high, check R5F6, R5F4, R5F5 and if there’s no defective component then replace IC505.

4) If 3.3 V (VCC33) is normal, check 1.2 V output (pin2, 4) voltage of IC509.  If 1.2 V of IC509 pin2, 4 doesn’t come out, then replace IC509.

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

IC505

IC509

D500

< MAIN board top view > < MAIN board bottom view >

3-6

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ONE POINT REPAIR GUIDE

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.

4-2. CRYSTAL (X500)

4-2-1. Solution

Please check and replace X500 on MAIN board.

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

1) If 3.3 V & 1.2 V is normal, check Reset ‘High’ of IC501 pinT12 on MAIN board.  If MAIN_RESET isn’t high, check MICOM (IC101) pin40.

2) If MAIN_RESET is high, check the soldering status of 24 MHz crystal (X500).

3) If the crystal (X500) doesn’t oscillate, check R508, R509, C502, C503 around crystal (X500).  If there’s no defective component, then replace X500.

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

X500

IC501

< Signal check point >

< Signal waveform >

3-7

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ONE POINT REPAIR GUIDE

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.

4-3. SERIAL FLASH (IC503)

4-3-1. Solution

Please check and replace IC503 on MAIN board.

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

1) If the crystal (X500) does oscillate, check serial flash (IC503) on MAIN board.  Check pin8(VCC), pin6(CLK), pin1(CS), pin2(DO), pin5(DI) of below waveform.

2) If pin1, 2, 5, 6, 8 doesn’t come out, check damping resistor (R564, R563, R535, R536, R534) of IC503.  If damping resistor of IC503 is OK, then replace IC503. (it need to download program)

3) After change IC503, if it is still not below waveform, check IC501(DSP IC).

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

VCC CS#

CLK DO

IC503

< Signal check point > < Signal waveform >

3-8

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ONE POINT REPAIR GUIDE

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.

4-4. SDRAM (IC502)

4-4-1. Solution

Please check and replace IC502 on MAIN board.

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

1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.  If pin17(#CAS), pin18(#RAS), pin19(#CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,

check damping resistor (R568, R506, R570, R544, R547).

2) If resistor is OK, then replace IC502 (SDRAM).

3) After change IC502, if it is still not below waveform, check IC501 (DSP IC).

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

VCC

Reset

address

IC502

data

< Signal check point >

/CS

RAS

/WE

CAS

< Signal waveform >

3-9

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ONE POINT REPAIR GUIDE

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.

4-5. DSP IC (IC501)

4-5-1. Solution

Please check and replace IC501(MLC3730) on MAIN board.

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

1) After check them by previous pages about no booting, if the set is still no booting,  Check soldering status of IC501.

2) If below bootstrap waveform doesn’t come out, then replace IC501(DSP IC).

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

R594 PGPB12

R597

(Yellow)

R598 PAD19 (Green)

R598

(Bottom)

< Signal check point >

R597 PAD20 (Pink)

< Signal waveform >

3-10

Page 32

ONE POINT REPAIR GUIDE

5. NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-1. SPINDLE MOTOR

5-1-1. Solution

Please check and replace IC407, IC408 on MAIN board.

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

1) Check the SPDO signal from Pin16 of IC407.  If no signal, check 3.3 V(RF) and X400.

2) Check the SP- & SP+ from IC408 to CN405 for driving SPINDLE motor. It is about 3.6 Vp-p.  If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN405 and MD.

4) Check the MD.  If the spindle motor is sort-circuit or has any trouble, it can not rotate CD discs.

Please check the function after changing another MD.

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

SP+

SP-

< Waveform of SP- & SP+

for driving SPINDLE motor >

SP-

Pin8 to CN405

SP+

Pin6 t o CN405

IC408

(Bottom)

< Signal check point >

3-11

Page 33

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-2. SLED MOTOR

5-2-1. Solution

Please check and replace IC407, IC408 on MAIN board.

5-2-2. 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 pick-up module.

Please check the function after changing another MD.

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

SL+

SL-

< Waveform of SLED- & SLED+

for driving SLED motor >

SL-

Pin9 to CN405

SL+

Pin7 to CN405

IC408

(Bottom)

< Signal check point >

3-12

Page 34

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-3. TRAY OPEN / CLOSE MOTOR

5-3-1. Solution

Please check and replace IC407, IC408 on MAIN board.

5-3-2. 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.

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

LO-

LO+(RED)

MOT _OPEN

MOT _CLOSE

< Waveform for driving TRAY

open/close motor >

LO+

Pin4 to CN405

LO-

Pin2 to CN405

MOT_CLOSE

6pin of IC408

< Signal check point >

IC408

(Bottom)

MOT_OPEN

7pin of IC408

3-13

Page 35

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-4. LASER TRACKING ACTUATOR

5-5-1. Solution

Please check and replace IC407, IC408 on MAIN board.

5-4-2. 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 CN404 for driving the tracking actuator.  If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN404 and MD.

4) Check the MD.  If the pick-up module has any trouble, it can not move the laser beam on the left or right side.

Please check the function after changing another MD.

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

TR- to CN404 TR+ to CN404

< Waveform of TR±

for driving TRACKING actuator >

TR+

Pin16 of CN404

CN404

< Signal check point >

TR-

Pin17 of CN404

3-14

Page 36

ONE POINT REPAIR GUIDE

NO OPERATION OF MD (DRIVING THE SERVO MOTORS)

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.

5-5. LASER FOCUSING ACTUATOR

5-5-1. Solution

Please check and replace IC407, IC408 on MAIN board.

5-5-2. 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 CN404 for driving the focusing actuator.  If no signal, check +1.8 V and +5 V for IC408.

3) Check if the FFC cable is solidly connected between CN404 and MD.

4) Check the MD.

 If the pick-up module has any trouble, it can not move the laser beam on the top or bottom side.

Please check the function after changing another MD.

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

F+ to CN404

F- to CN404

< Waveform of F±

for driving FOCUSING actuator >

F+

Pin15 of CN404F-Pin18 of CN404

CN404

< Signal check point >

3-15

Page 37

ONE POINT REPAIR GUIDE

6. NO SOUND

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

6-1. IN THE USB FUNCTION

6-1-1. Solution

Please check and replace IC501 on MAIN board & IC300 on USB board.

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

1) Check +5VU to USB board.

 If +5.6 VA to pin2 of IC300(LDO) doesn’t come out, check pin4, 5 of CN304.  If +5.6 VA is normal & +5VU of IC300 pin3 doesn’t come out, then replace IC300.

2) Check if “Digital audio AMP block”.

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

MCS Interface

USB2

USB1

SUBSYQ,

CD_R/W,

CD_MCK/BCK

BUSY,CD_16 M,

MIC CODEC

ADC CODEC

12.288 MHz

16.9344 MHz

/LRCK/DATA

(+3.3 V)

TAS5548

PWM

Front : 470 W X 2 ea Woofer : 460 W X 2 ea Front1 : 470 W X 2 ea

USB_HUB_DP/DN

DAC_MCLK /BCK/LRCK

ADC_DATA

24 MHz

PWM_MCK/BCK/

LRCK

RL±

RR±

AMP_OSC

(+3.3 V_USB)

BT_RX, BT_CTS

DAC IC AZ4580

(+5 V, +3.3 V_ADC)

CS5346

PROTEC / SD/DCP

MIC_SIG0

(+5_MIC)

S4308

PT_L/R

AUX_L/R

TUNER_L/R

CLK/DAT/CE/RST/GPO2

DRIVER

IRS2092

(x 4 EA)

SW1

SW2

FAN_CTL

MIC_SIG

FET IRF6775 (x 12EA)

D+

MIC_DET

MIC

Portable

AUX

(+3.3 V)

TUNER

AGL_F/R

FL1

FL2

SW1

SW2

AGL_SW

OTW

D-

LC78615ERF+ SERVO

CD_RST

CD_DIN_DOUT

(+3.3 V_CD, VCC 1.2)

/RX

S/MCU_RST

I2C/EXT_MUTE/RST

SPENA

MLC3730

MCS LOGIC

MIC_O_DATA0

< USB function signal ﬂ ow >

< Waveform of USB D± signal >

USB D+ / D- (CN502 Pin1, 2 & 9, 10)

3-16

Page 38

ONE POINT REPAIR GUIDE

NO SOUND

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

6-2. IN THE AUX FUNCTION

6-2-1. Solution

Please check and replace IC202 on MAIN board.

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

1) Check AUX_L/R signals to IC202 (Pin7, 8).

2) Check if MCS_BCLK, MCS_LRCLK, & MCS_MCLK are entered from IC501 to IC202.

3) Check if ADC/MIC_DATA is entered from IC202 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.

4) Check the following I2S signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the

IC is distorted or no signal, replace it with a new one.

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

6-2-3. Service hint (Any picture / Remark)

CS5346

MCS_MCLK

IC501

MLC3730

IC202

AUX_ L/R

ADC/MIC_ DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

IC600

TAS5548

< AUX function signal ﬂ ow >

AUX

PWM

IR A MP

IRS2092+ IRF6775

ADC/MIC_DATA to R215

MCS_BCK to R216

MCS_LRCK to R219

MCS_MCLK to R220

< Signal check point >

IC202

PT_R to pin22

PT_L to pin21

3-17

Page 39

ONE POINT REPAIR GUIDE

NO SOUND

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

6-3. IN THE PORT. IN FUNCTION

6-3-1. Solution

Please check and replace IC202 on MAIN board.

6-3-2. How to troubleshoot (Countermeasure)

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

2) Check if PT_LR is entered pin4 & 5 of CN3J01  pin4 & 5 of CN3V02  Pin21 & 20 of CN3V01.

3) Check POT_L/R signals to IC202(pin21, 22).

4) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC202.

5) Check if ADC_DATA is entered from IC202 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.

6) Check the following I2S signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC. The power is normal but ,

if the signal waveform to the IC is distorted or no signal, replace it with a new one.

7) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.  If AMP is damaged, replace it with a new one.

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

IC600

PWM

POT . IN

IR A MP

IRS2092+ IRF6775

CS5346

MCS_MCLK

IC501

MLC3730

T-

IC202

POT_L/R

ADC/MIC_ DATA

MCS_BCK

MCS_LRCK

MIX_DATA_OUT

VOLUME

Board

TAS5548

< PORT. IN function signal ﬂ ow >

ADC/MIC_DATA to R215

MCS_BCK to R216

MCS_LRCK to R219

MCS_MCLK to R220

< Signal check point >

IC202

PT_R to pin22

PT_L to pin21

3-18

Page 40

ONE POINT REPAIR GUIDE

NO SOUND

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

6-4. IN THE TUNER FUNCTION

6-4-1. Solution

Please check and replace IC202, TU500 on MAIN board.

6-4-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_LR is entered from Pin1 & 3 of TU101 to IC202(Pin23, 24).

 If no signals, Check +3.3 V for Tuner power.  Check if the Tuner control signals (CLK, DAT, CE, RST, GPO2) are entered from IC101 to TU101.

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 IC202.

3) Check if ADC_DATA is entered from IC202 to IC501.  If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.

4) Check the following I2S audio signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC. The power is normal but,

if the signal waveform to the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.  If AMP is damaged, replace it with a new one.

6-4-3. Service hint (Any picture / Remark)

TUNER

IR A MP

IRS2092+ IRF6775

CS5346

MCS_MCLK

MLC3730

IC202

IC501

T-

ADC/MIC_ DATA

MIX_DATA_OUT

TUNER _L/R

MCS_BCK

MCS_LRCK

Jack

Board

IC600

TAS5548

PWM

ADC/MIC_DATA to R215

MCS_BCK to R216

MCS_LRCK to R219

MCS_MCLK to R220

< Signal check point >< TUNER function signal ﬂ ow >

TUNER_R

to pin24

TUNER_L

to pin23

IC202

3-19

Page 41

ONE POINT REPAIR GUIDE

NO SOUND

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

6-5. IN THE MIC IN FUNCTION

6-5-1. Solution

Please check and replace ICM101 or IC202 on the Main Board.

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

1) Check MIC_SIG signal to pin40 of CN105.  If no signal, check the signal to pin1 of CN380 on the MIC board.

Check if the signal is entered from pin1 of CN380 to MAIN board.

2) Check if MIC_SIG is entered from pin40 of CN105 to pin3 to ICM101 (MIC AMP).

3) Check if the amplified signal comes out from pin4 of ICM101.  If no signal output, check +12 V for ICM101, replace ICM101 with a new one if it has a problem.

4) Check if MCS_BCK, MCS_LRCK & MCS_MCLK are entered from IC501 to IC202.

5) Check if ADC_DATA is entered from IC202 to IC501.  If no signal, check +5 V & +3.3 V (ADC) for IC202. If is NG, replace it a new one.

6) Check the following I2S audio signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC. The power is normal but,

if the signal waveform to the IC is distorted or no signal, replace it with a new one.

7) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.  If AMP is damaged, replace it with a new one.

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

32.768 KHz

(+3.3 V_CD, VCC 1.2)

MLC3730

MCS LOGIC

MIC_O_DATA0

12.288 MHz

MIC CODEC

ADC CODEC

(+3.3 V)

TAS5548

PWM

DAC_MCLK /BCK/LRCK

ADC_DATA

24 MHz

PWM_MCK/BCK/

LRCK

RL±

RR±

AMP_OSC

(+5 V, +3.3 V_ADC)

CS5346

DAC IC

AZ4580

DAC IC

AZ4580

DAC IC AZ4580

DRIVER IRS2092 (x 4 EA)

(+5_MIC)

S4308

SW1

SW2

MIC_SIG0

MIC_SIG

FET IRF6775 (x 12EA)

MIC_DET

MIC

MIC_SIG

FL1

FL2

SW1

SW2

< Signal check point >< MIC IN function signal ﬂ ow >

3-20

Page 42

ONE POINT REPAIR GUIDE

NO SOUND

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

6-6. IN THE BLUETOOTH FUNCTION

6-6-1. Solution

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

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

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

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

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

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

3) Check if MCS_BCK, MCS_LRCK is entered from IC501 to IC600.  If no signal, check VCC12(+1.2 V) for IC501. If it is abnormal, change replace it a new one.

4) Check the following I2S signal flow from IC501 to IC600.  If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide.  If AMP is damaged, replace it with a new one.

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

32.768 KHz

(+3.3 V_CD, VCC 1.2)

MLC3730

MCS LOGIC

MIC_O_DATA0

12.288 MHz

MIC CODEC

ADC CODEC

(+3.3 V)

TAS5548

PWM

24 MHz

PWM_MCK/BCK/

LRCK

RL±

RR±

AMP_OSC

BT_RX, BT_CTS

DAC IC AZ4580

< BLUETOOTH function signal ﬂ ow >

DRIVER IRS2092 (x 4 EA)

FL1

FET

FL2

IRF6775

(x 12EA)

SW1

SW2

< Signal check point >

3-21

Page 43

ONE POINT REPAIR GUIDE

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

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

7-1. IC700 ~ IC705

7-1-1. Solution

Please check and replace IC700 ~ IC705 on MAIN board.

7-1-2. 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 Audio Data input (Pin3 of IC700 ~ IC705).

4) If the audio signal output has no output, try to change IC which has no output.

5) Lastly, check Speaker Terminal (TM701, TM702).

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

< MAIN board top view >

3-22

Page 44

ONE POINT REPAIR GUIDE

8. NO POWER ON (STANDBY LED IS BLINKING)

It doesn’t turn on, and blinks standby LED(Red).

8-1. AMP FETs

8-1-1. Solution

Please check and replace Q705 ~ Q708, Q711 ~ Q718 on MAIN board.

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

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

- When Some of AMP FETs dead.

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

Notice for FET service

AMP FET : IRF6775

* 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.

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

3-23

Page 45

ONE POINT REPAIR GUIDE

9. SPEAKER NO AUDIO

Speaker No Audio

9-1. AMP IC

9-1-1. Solution

Please check and replace IC700 ~ IC705 on MAIN board.

9-1-2. 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.

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

CN 110 P IN1, 2 : - 66 V PIN3, 4 : PGND PIN5, 6 : +66 V

# 5 P I N o f I C → CSD

3-24

Page 46

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No output 5.6 VA

F901 normal?

YES

BD901 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.

D960, D961 normal?

Check or replace D960, D961.

No 12 V

Is the

VCC 13 VA supplied to IC951

Pin1?

YES

Is there

‘H’ signal at IC951

Pin4?

YES

Check and replace IC951.

Or check line of MAIN PCB is short or not.

Check or replace D962/ D963.

Check P_CTL from μ-com.

3-25

Page 47

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 VFD

R965 normal?

YES

Check or replace Q951.

Check P_CTL from μ-com.

Check or replace R965 / D959.

R968 normal?

YES

D957, D959 normal?

YES

ZD951, ZD952 normal?

YES

Check line of FRONT PCB is short or not.

Replace R968.

Replace D957, D959.

Replace ZD951, ZD952.

3-26

Page 48

ELECTRICAL TROUBLESHOOTING GUIDE

No output AMP gate line

Is the VCC

13 VA supplied to IC952

Pin1 to Pin3?

Check and replace IC952.

Or check line of MAIN PCB is short or not.

R952 normal?

YESYES

Check or replace D951, D952.

Check or replace R952.

3-27

Page 49

ELECTRICAL TROUBLESHOOTING GUIDE

No AMP output

Is the

C904, C905 voltage

about 380 V?

YES

F911 normal?

YES

PFC P.CTL OK?

YES

Is the

VCC 12 V supplied to

IC904 Pin16?

YES

Check or replace

IC904, Q907 ~ Q910.

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).

3-28

Check or replace D953 ~ D956.

Check line of MAIN PCB is short or not.

Page 50

ELECTRICAL TROUBLESHOOTING GUIDE

2. SYSTEM PART

Power on.

“HELLO”

Display on FLD

OK?

YES

Volume LED (LD3V31~LD3V40 LD3V42~LD3V49)

turn on?

CN301

cable connection

OK?

YES

CN301

Pin1, 3, 5

power OK?

YES

CN301

Pin9 ~ 11 data signal

OK?

YES

Q301, 303, 304

grid voltage OK?

Q301, Q303, Q304

grid voltage OK?

Check 17p FFC cable.

Check SMPS board.

Check MAIN board.

Replace DIG301.

Check SMPS board.

YES

When turn the volume,

count is change?

YES

FRONT board OK.

YES

CN3V01

Pin8, 9 +12 V

OK?

YES

Replace LED.

(LD3V09 ~ LD3V24)

CN3V01

pin31, 32

signal OK?

YES

Check MAIN board.

3-29

Check MAIN board.

Check FFC cable.

Page 51

ELECTRICAL TROUBLESHOOTING GUIDE

3. NO AUDIO PART

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?

(IC408 Pin6, 7)

YES

Check IC501.

Check Loading motor.

Check IC408.

Focusing/

Tracking/ Sled signal

OK?

YES

MON_MPD(CN404 Pin22)

about 180 mV?

Pin51, 52, 53 I2S output

IC407

signal OK?

YES

IC501

Pin N1, N2, N4 I2S input

signal OK?

YES

IC407

RF & Servo signal

OK?

YES

Check IC501.

3-30

Check FFC cable

to CN404, CN405.

Page 52

ELECTRICAL TROUBLESHOOTING GUIDE

USB play

When insert USB,

IC501 PinU7, U8, A7, A8 USB_D

signal OK?

YES

AUX

IC300

USB power +5 VU

OK?

YES

Replace IC300.

Pin7, 8 AUX input signal

IC202

OK?

YES

IC202

Pin42, 43, 44 I2S input signal

OK?

YES

IC202 Pin41

ADC/MIC_data output signal

OK?

YES

Check audio cable.

Check IC501.

Replace IC202.

3-31

Page 53

ELECTRICAL TROUBLESHOOTING GUIDE

POT. IN

Pin21, 22 POT. IN input signal

IC202

OK?

YES

IC202

Pin42, 43, 44 I2S input signal

OK?

YES

IC202 Pin41

ADC/MIC_data output signal

OK?

YES

TUNER

Check MIC board.

Check IC501.

Replace IC202.

Pin23, 24 TUNER_L/R input

IC202

signal OK?

YES

IC202

Pin42, 43, 44 I2S input

signal OK?

YES

IC202

Pin41 ADC data output

signal OK?

YES

TU500

TUNER_L/R output

signal OK?

YES

Check IC501.

Replace IC202.

3-32

Check +3.3 V of TU500.

Page 54

ELECTRICAL TROUBLESHOOTING GUIDE

PinD1, D2, E1 I2S clock signal

IC501

OK?

YES

IC501

PinE2 I2S data signal

OK?

YES

IC600

PWM data output signal

OK?

YES

Check IC501.

Replace IC600.

3-33

Page 55

ELECTRICAL TROUBLESHOOTING GUIDE

Pin28, 29, 35, 36

of IC600, FL/FR± signal

OK?

YES

IC601, 602

FL/FR audio signal

OK?

YES

Pin13 of

IC700, IC701, IC704, IC705

FL/FR audio signal

OK?

YES

IC700, IC701, IC704, IC705.

Check IC600.

Check IC601, IC602.

Check

of IC600, SWL/SWR± signal

Check IC600.

SWL/SWR audio signal

Check IC603, IC604.

IC702, IC703, IC706, IC708

SWL/SWR audio signal

Check

IC702, IC703, IC706, IC708.

Pin26, 27, 31, 32

OK?

YES

IC603, 604

OK?

YES

Pin13 of

OK?

YES

±40 V, -28 V, ±5 V power voltage OK?

YES

Q700,

Q701, Q702, Q703

Q714, Q716, Q719, Q720

YES

OK?

Check Q701, Q702, Q703, Q704,

Q714, Q716, Q719, Q720.

Check SMPS.

Check Q704, Q705, Q708, Q709,

Q721, Q722, Q723, Q724.

Check speaker cable connection.

3-34

Check SMPS.

±40 V, -28 V, ±5 V

power voltage OK?

YES

Q704,

Q705, Q708, Q709

Q721, Q722, Q723, Q724

OK?

YES

Page 56

ELECTRICAL TROUBLESHOOTING GUIDE

4. NO LIGHTING (WOOFER SPEAKER)

CD / USB play

CNWS01 Pin3, 4 I2C signal

CNWM02,

OK?

YES

Pin1 +12 V OK?

YES

Check woofer speaker.

Check IC501.

Check SMPS board.

3-35

Page 57

WAVEFORMS OF MAJOR CHECK POINT

1. WAVEFORM OF SERVO

Figure 1-1. CD-16 M

(IC407 Pin31)

Figure 1-2. SERVO-FE, TE, FOD, RF

(IC407 Pin61, 62, 63 / IC408 Pin1)

3-36

Page 58

2. WAVEFORM OF MOTOR DRIVE

SL+

SP+

SP-

Figure 2-1. SP- & SP+ for driving SPINDLE motor

(IC408 Pin17, 18)

SL-

Figure 2-2. SL- & SL+ for driving SPINDLE motor

(IC408 Pin11, 12)

LO-

MOT_OPEN

LO+(RED)

MOT_CLOSE

Figure 2-3. LO- & LO+ for driving Tray motor

(IC408 Pin9, 10)

3-37

Page 59

3. WAVEFORM OF AUDIO SIGNAL

LRCK

BCK

DATA

Figure 3-1. (IC501 Pin83, 84, 85) Figure 3-2. AUDIO_L/R

AUDIO_L

AUDIO_R

4. WAVEFORM OF ADC 5. WAVEFORM OF USB

LRCK

MCK

BCK

Figure 4. ADC I2S

(IC202 Pin42, 43, 44)

3-38

D+

D-

Figure 5. USB D+/D-

(CN502 Pin1, 2 & Pin9, 10)

Page 60

6. WAVEFORM OF CRYSTAL

Figure 6. 12 MHz Crystal

(IC501 Pin27, 28)

7. WAVEFORM OF VFD GRID CURRENT DRIVER

CH1:R327(TP304)

CH2:Q301 Emitter

Figure 7.

3-39

Page 61

3-40

Page 62

3-41 3-42

VFD

FRONT

10P, 2 mm

Portable

MIC

MIC Vol

MIC & Portable

10P, 2 mm

10P, 1.25 mm

15P, 2.5 mm6P, 3.96 mm

SMPS

15P, 2.5 mm6P, 3.96 mm

40P, 1.25 mm

MAIN

FAN

40P, 1.25 mm

0P, 1 mm

WIRING DIAGRAM

Page 63

3-43 3-44

BLOCK DIAGRAMS

1. 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

20 A

600 V

2 EA

4.5 V

39 V

12 V

5.6 VA

+PVDD (66 V)

FL(+/ - )

VKK

MAIN SMPS IC (STR- 2A153)

Flyback

MAIN TRANS

u-com / BT USB / MPEG

Motor Drive

FAN/LED/ Mic

VFD

PFC P- CTRL

-5 V

-PVDD (-66 V)

GATE

Half

Bridge

LLC

TRANS

(AMP)

Gate Drive

4.2 CH 2300 W

OPAMP

AMP P- CTRL

Totem

pole

PFC IC

(R2A20112A)

Interleaved

DCM

FET

13 A

600 V

4 EA

Gate Drive

PFC Out (380 V)

On/Off

Vcc

On/Off

R_ L

R_R

Page 64

3-45 3-46

2. MAIN SYSTEM BLOCK DIAGRAM

LC78615ERF+ SERVO

AM5890

Motor Drive

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

USB_HUB_DP/DN

CS5346

MLC3730

MCS LOGIC

SPDO/SLDO/FOD/TRD

LOAD±, SLED±, SPIN±, TR±, F±

OP_SW, CL_SW, UP_SW, DN_SW, D_SEN SE

MOT_MUTE, CLOSE, OPEN

ADC_DATA

DAC_MCLK /BCK/LRCK

PT_L/R

AUX_L/R

AUX

USB1

Portable

CD_DIN_DOUT

CD_R/W,

BUSY,CD_16 M,

SUBSYQ,

CD_RST

CD_MCK/BCK

/LRCK/DATA

TUNER_L/R

USB2

TUNER

FRONT

MICOM

R5F100GEAFB

VFD_STB/CLK/DO/RST

STANDBY_LED,VOL_LED,

VFD_LED/REMOCON

USB_PWR_CTRL/VOL_A/B/

KEY1, 2, 3

TAS5548

PWM

RL±

DRIVER IRS2092 (x 4 EA)

Front : 470 W X 2 ea Woofer : 460 W X 2 ea Front1 : 470 W X 2 ea

16.9344 MHz

VFD

DIG301

Receiver

LED_CTRL, FILE A/B,

SCRATCH A/B FAN CTRL,

MIC_VOL A/B

Volume/

Key

32.768 KHz

MCU_CS/MCU_RST

MUC_TX/RX

MIC_O_DATA0

(+3.3 V)

(+3.3 V_UCOM)

(+3.3 V_CD, VCC 1.2)

(+5 V)

(+3.3 V_USB)

(+5 V, +3.3 V_ADC)

(+3.3 V)

P/UP

DECK MECHANISM

3 Disc 1 Disc

(VCC50)

12.288 MHz

RR±

DAC IC AZ4580

FET IRF6775 (x 12EA)

SW1

SW2

SW1

SW2

I2C/EXT_MUTE/RST

PWM_MCK/BCK/

LRCK

SPENA

AGL_F/R

AGL_SW

PROTEC / SD/DCP

OTW

FAN_CTL

AMP_OSC

MCS Interface

128 Mbit

SDRAM

16 MByte

Serial Flash

(+3.3 V_CD)

CLK/DAT/CE/RST/GPO2

S4308

MIC

MIC_SIG0

MIC_SIG

(+5_MIC)

MIC_DET

MIC CODEC

ADC CODEC

BT_RX, BT_CTS

1 MByte

Serial Flash

24 MHz

FL1

FL2

Page 65

3-47 3-48

3. MAIN POWER BLOCK DIAGRAM

SMPS

+5.6 VA

TU101

TUNER

YST996

IC100

EEPROM

24CS16

IC600

TAS5548

IC501

MCS

MLC3730

IC502

SDRAM

EM639165

IC407

RF IC

IC509

AZ1117

IC807

USB HUB

SMSC

IC501

VFD

RMC

+1.2 VA

IC510

FLASH

32Mb

IC507

LDO

AZ1117

IC3U01

USB PWR

LM37102D

IC408

MOTOR

AM3053S

+5 V

+3.3 VA

3.2 VA

VFD

5 mA

3 mA

150 mA

25 mA

70 mA

+5 V

370 mA

LED

STBY

20 mA

2 mA

2.393 A

450 mA

Pick up

80 mA

15 mA

60 mA

130 mA

-> 0 mA

20 mA 20 mA

160 mA

ADC

IC202

CS5346

20 mA

VKK

FL ±

550 mA

1 A

287 mA

Bluetooth

Option

38 mA

CP Chip

Option

7 mA

+3.3 V

IC204

LDO

LM37102D

IC505

LDO

TJ4220

IC102

RESET

AZ7027

IC103

PWR SENS

AZ7027

2 mA 2 mA

10 mA

+3.3 V

3.2 V

80 mA

USB HUB

IC506

AZ1117

USB HUB

+1.2 V

IC101

U_COM

RENESAS

22 mA

50 mA

+12 V(2 A)

IC506 MIC PRE AMP S4308

FAN X 1

FRONT SPK

LED(32EA)

Woofer SPK LED(68EA)

100 mA 2 mA

+62 V

-5 V

-62 V

-48 V

IRS2092x6 AMP IC

IRF6775Mx12 FET

IC601~4

OP AMP

AZ4580

IC707

LM37102D

+5 V

16.3 Apk

150 mA

100 mA

240 mA

480 mA

980 mA

124 mA

24 mA

100 mA

FRONT LED

16EA

160 mA

442 mA

RTC3.0

Page 66

3-49 3-50

CIRCUIT DIAGRAMS

1. SMPS - POWER #1 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.

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.

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

SMPS_POWER #1

EAX65367301-SD(#01)_Rev22_1.6

2015. 01. 06

Page 67

3-51 3-52

2. SMPS - POWER #2 CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

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_POWER #2

EAX65367301-SD(#02)_Rev22_1.6

2015. 01. 06

Page 68

3-53 3-54

3. MAIN - CD DSP CIRCUIT DIAGRAM

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

CD DSP

EAX66324601-SD(#01)_Rev0_1.0

2015. 01. 06

Page 69

3-55 3-56

4. MAIN - RF / SERVO CIRCUIT DIAGRAM

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

RF/SERVO

EAX66324601-SD(#02)_Rev0_1.0

2015. 01. 06

Page 70

3-57 3-58

5. 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

EAX66324601-SD(#03)_Rev0_1.0

2015. 01. 06

Page 71

3-59 3-60

6. MAIN - AMP CIRCUIT DIAGRAM

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

AMP

EAX66324601-SD(#04)_Rev0_1.0

2015. 01. 06

Page 72

3-61 3-62

7. FRONT VOLUME CIRCUIT DIAGRAM

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

FRONT VOLUME

EAX65547304-SD_Rev1_1.0

2015. 07. 14

Page 73

3-63 3-64

8. MIC & PORTABLE CIRCUIT DIAGRAM

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

MIC & PORTABLE

EAX65589004-SD_Rev1_1.0

2015. 07. 14

Page 74

3-65 3-66

9. FRONT SPEAKER MAIN CIRCUIT DIAGRAM

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

FRONT SPK MAIN

EAX65664101_6.1.3_F_SPK_LIGHTING_MAIN_SD

2014. 01. 25

Page 75

3-67 3-68

10. FRONT SPEAKER SUB CIRCUIT DIAGRAM

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

FRONT SPK SUB

EAX65664201_6.1.3_F_SPK_LIGHTING_SUB_SD

2014. 01. 25

Page 76

3-69 3-70

11. WOOFER SPEAKER MAIN CIRCUIT DIAGRAM

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

WF MAIN

EAX65684301_6.1.3_SPK_LED_LIGHTING_SD

2014. 01. 25

Page 77

3-71 3-72

12. WOOFER SPEAKER SUB CIRCUIT DIAGRAM

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

WF SUB

EAX65664001_6.1.3_WF_SPK_LIGHTING_SUB_SD

2014. 01. 25

Page 78

CIRCUIT VOLTAGE CHART

1. CONNECTORS 2. CAPACITORS

3-73 3-74

Location Value & Spec Voltage_Spec

Play back Standby

positive (+) positive (+)

C102 4.7uF/50V 50V 1.75 2.00

C104 1uF/50V 50V 0.00 0.00

C106 100uF/16V 16V 10.65 10.84

C239 100uF/16V 16V 3.30 3.31

C244 47uF/16V 16V 5.17 5.18

C260 47uF/16V 16V 5.05 5.14

C311 47uF/50V 50V 41.30 41.40

C402 100uF/16V 16V 5.15 5.17

C404 47uF/16V 16V 3.32 3.31

C429 220uF/16V 16V 5.18 5.17

C479 220uF/16V 16V 1.61 1.65

C481 47uF/16V 16V 0.00 0.02

C501 1000uF/6.3V 6.3V 3.08 3.15

C517 47uF/16V 16V 1.23 1.20

C5A9 47uF/16V 16V 1.23 1.20

C643 100uF/16V 16V 5.08 5.17

C700 100uF/16V 16V 0.00 0.00

C707 2200uF/80V 80V 65.80 65.50

C728 2200uF/80V 80V 65.75 65.80

C752 1000uF/80V 80V 65.80 65.50

C798 1000uF/80V 80V 65.75 65.80

C881 100uF/16V 16V 11.82 11.86

Pin No

Location

Pin Name

Spec

(V)

Spec Range

(V)

CABLE

Input

Margin

(V)

CABLE

Output

Margin

(V)

CN106 (MAIN) CN901 (SMPS) CN106 (MAIN)

1 VKK 39 35 ~ 43 40.9 1.90 40.9 1.9

2 FL+ 7.2 na 7.65 0.45 7.65 0.45

3 FL- 2.5 na 2.74 0.24 2.76 0.26

5 -5V -5 -4.8 ~ -5.2 -5.01 -0.01 -5.01 -0.01

7,8,9 +5.6V 5.6 5.2~5.8 5.67 0.07 5.66 0.06

13 +12V 12 11 ~ 13 12 0.00 11.99 -0.01

14 -B -66 -64 ~ -68 -65.8 0.20 -65.8 0.2

15 GATE -54 -52 ~ -56 -53.8 0.20 -53.8 0.2

CN502 CN304(USB) CN103 (MAIN)

2,3 +5.6VA 5.6 5.2~5.8 5.65 0.05 5.65 0.05

CN105 CN301 (Front) CN105 (MAIN)

13 FL- 2.5 na 2.83 0.33 2.78 0.28

19 VKK 39 35 ~ 43 41.3 2.30 40.8 1.8

20 FL+ 7.2 na 7.35 0.15 7.32 0.12

22 3.3V 3.3 3.0~3.6 3.26 -0.04 3.26 -0.04

30 12V 12 11 ~ 13 11.92 -0.08 11.94 -0.06

CN404 (MD) CN404 (MAIN)

1,8,9 VCC 5 4.8~5.2 4.87 -0.13 5.08 0.08

CN110 CN902 (SMPS) CN110 (MAIN)

1,2 -B -66 -64 ~ -68 -65.8 0.20 -65.8 0.20

5,6 +B 66 64 ~ 68 65.5 -0.50 65.5 -0.50

CN504 (BT) CN504 (MAIN)

10 VDD 3.3 3.0~3.6 3.27 -0.03 3.27 -0.03

Page 79

3-75 3-76

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD (TOP VIEW)

NOTE) Warning

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

Page 80

2. SMPS P.C.BOARD (BOTTOM VIEW)

3-77 3-78

NOTE) Warning

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

Page 81

3-79 3-80

3. MAIN P.C.BOARD (TOP VIEW)

Page 82

3-81 3-82

4. MAIN P.C.BOARD (BOTTOM VIEW)

Page 83

3-83 3-84

5. FRONT VOLUME & MIC & PORTABLE P.C.BOARD (TOP VIEW)

Page 84

3-85 3-86

6. FRONT VOLUME & MIC & PORTABLE P.C.BOARD (BOTTOM VIEW)

Page 85

3-87 3-88

7. FRONT SPEAKER MAIN/SUB & WOOFER SPEAKER MAIN/SUB P.C.BOARD (TOP VIEW)

8. FRONT SPEAKER MAIN/SUB & WOOFER SPEAKER MAIN/SUB P.C.BOARD (BOTTOM VIEW)