Internal Use Only

Website http://biz.lgservice.com

SERVICE MANUAL
MINI HI-FI SYSTEM
SERVICE MANUAL

MODEL: CM9950 (CM9950, CMS9950F)

MODEL: CM9950
(CM9950, CMS9950F)

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

P/NO : AFN77255282 JUNE, 2015

 CONTENTS

SECTION 1 ........ GENERAL

SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ REPLACEMENT PARTS LIST

1-1
 SECTION 1
SUMMARY

CONTENTS

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

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

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

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

PROGRAM DOWNLOAD GUIDE...................................................................................................................... 1-8

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

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

1-2
 SERVICING PRECAUTIONS
NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.

Storage in conductive bag Drop impact

2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or
damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

NEVER look directly at the laser beam, and don’t allow

contact with fingers or other exposed skin.

5) Cleaning the lens surface

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used
for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cot-
ton swab should be used, taking care not to distort lens.

Pressure
Magnet
Pressure

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
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 magne-
tism 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)
Resistor
Conductive
(1 M)
Sheet

1-4
 ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.

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

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

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS

INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE

SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.

1-5
 HIDDEN KEY MODE
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 or
Front Stop + Front Open for 5s
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

1-6
 SERVICE INFORMATION FOR EEPROM

POWER ON

It is possible at any function.

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

Front ‘STOP’ + Remote control “ ”

push same timing during 5s

FLD “OP00-…..”

Move to appropriate position

And make changes
with RMC “ , , , REPEAT ” key.

Press STOP Key

VFD “WRITE OK”

Front ‘STOP’ + Remote control “ ”

push same timing during 5s

VFD “E2P CLR”

Completed

1-7
 PROGRAM DOWNLOAD GUIDE
1. MAIN MCS PROGRAM (MAIN MCS CHIP)
Download program file name must be HG590_CM9950_YYMMDDX.bin
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 at USB1 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

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

NO USB

 Insert USB device into USB A Port at USB1 function

SEARCH


MAIN FIRMWARE


FINISH


Auto POWER OFF

1-8
2. SUB MCS PROGRAM (SUB MCS CHIP)
Download program file name must be HG520_CM9950_YYMMDDX.bin
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 at 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

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

NO USB

 Insert USB device into USB B Port at USB2 function

SEARCH


SUB FIRMWARE


FINISH


Auto POWER OFF

1-9
3. EQ PROGRAM
Download program file name must be EQ_PRG.BIN
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 at USB1 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

1) (Fast) Format USB device

2) Copy Firmware file to USB device.

NO USB

 Insert USB device into USB A Port at USB1 function

SEARCH


EQ UP


FINISH


Auto POWER OFF

1-10
 FOTA UPDATE
Step1 : App connecting Step2 : Step3 :
(Check FW version) Device version info Select update button

Step4 : Step5 : Step6 :

Download from CDN server Transfer FW FW Flash Writing

Step7 :
FOTA complete

1-11
 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) 495 mm x 213 mm x 462 mm
Net Weight (Approx.) 8.1 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 60 %
Bus Power Supply (USB) 5V 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

• 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
Total Output 4 400 W
Front LOW : 1 000 W X 2 (8 Ω at 70 Hz)
MID : 850 W X 2 (8 Ω at 1 kHz)
HIGH : 350 W X 2 (6 Ω at 8 kHz)
THD 25 %

• FRONT SPEAKER
Type LOW : 1 Way 1 Speaker
MID : 2 Way 2 Speaker
HIGH : 1 Way 1 Speaker
Impedance LOW : 8 Ω
MID : 8 Ω
HIGH : 6 Ω
Rated Input Power LOW : 1 000 W
MID : 850 W
HIGH : 350 W
Max. Input power LOW : 2 000 W
MID : 1 700 W
HIGH : 700 W
Net Dimensions (W x H x D) 521 mm x 713 mm x 486 mm
Net Weight 30.2 kg

• Design and specifications are subject to change without notice.

1-12
 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
2-2
EXPLODED VIEWS NOTES) THE EXCLAMATION POINT WITHIN AN
EQUILATERAL TRIANGLE IS INTENDED
TO ALERT THE SERVICE PERSONNEL
1. CABINET AND MAIN FRAME SECTION TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
LITERATURE.

276
443 B 277
443 278
CABLE4 275 276
C A CONTROL_A
260 443 275
274
443 M
A59 279
F
G MAIN
D A44C
E N
F
G
L 443 443
A46 H
J
K

267
271 268
498
498 443
A43
VFD
E CABLE3
N 280
443 S
271 443
R NFC
271 R
CABLE2 O
270 P M

498
Q
273 O CABLE3
443 P
H Q
J MASTER VOL. 300
K
443 A53 TUNER &
MIC & AUX A54 443
257 HP
443
A42 A56 L
266
515
CABLE1 443
BT 443
C
A52 443
515 B
SMPS 443
443 254 256 A
443 264
515 D
263
253
A44B
263

A47 S
262
255
509
443
258
261
251 443

250
A44A 265
272 265
252
2. MECHANISM DECK SECTION
1439

1002
A001

1005 1001

1026 1003 1004

1024 1030
1437

1437

1024
1024
1012
1049
1437

1013 1016 1015 1024

1020

1011

A006

1019
1043
1018

1045
1439 A005
3. PACKING ACCESSORY SECTION

801 Owner’s manual 808 Batteries

825 FM Antenna 900 Remote Control

826 Filter, Ferrite Core (65 Ω)

826A Filter, Ferrite Core (100 Ω)

804 Bag

803 Packing
803 Packing

802 Box
4. SPEAKER SECTION

A60L

A60R
 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. NO POWER ON (STANDBY LED IS BLINKING) ................................................................................... 3-7
7. SPEAKER NO AUDIO ............................................................................................................................ 3-8
8. NO BOOTING IN CD/USB FUNCTION .................................................................................................. 3-9
9. NO OPERATION OF MD ...................................................................................................................... 3-13
10. NO SOUND ........................................................................................................................................... 3-18

ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................. 3-24

1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 3-24
2. SYSTEM PART ..................................................................................................................................... 3-27
3. NO AUDIO CHECK ............................................................................................................................... 3-28
4. NO LIGHTING (SPEAKER LED) .......................................................................................................... 3-32

WAVEFORMS OF MAJOR CHECK POINT.................................................................................................... 3-33

1. DSP (IC506/ IC5001) ............................................................................................................................ 3-33
2. PWM (IC601) ........................................................................................................................................ 3-34
3. SERVO (IC401)..................................................................................................................................... 3-35
4. MOTOR DRIVER (IC400) ..................................................................................................................... 3-36
5. ADC (IC204).......................................................................................................................................... 3-37
6. USB (CN505) ........................................................................................................................................ 3-37
7. BLUETOOTH (CN502).......................................................................................................................... 3-38

WIRING DIAGRAM .......................................................................................................................................... 3-39

BLOCK DIAGRAMS ........................................................................................................................................ 3-41

1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-41
2. SMPS BLOCK DIAGRAM ..................................................................................................................... 3-43
3. POWER BLOCK DIAGRAM ................................................................................................................. 3-45

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-47

1. SMPS - POWER #1 CIRCUIT DIAGRAM ............................................................................................ 3-47
2. SMPS - POWER #2 CIRCUIT DIAGRAM ............................................................................................ 3-49
3. MAIN - MAIN DSP CIRCUIT DIAGRAM ............................................................................................... 3-51
4. MAIN - SUB DSP CIRCUIT DIAGRAM ................................................................................................ 3-53
5. MAIN - SERVO CIRCUIT DIAGRAM .................................................................................................... 3-55
6. MAIN - ADC/ DAC CIRCUIT DIAGRAM ............................................................................................... 3-57
7. MAIN - PWM CIRCUIT DIAGRAM........................................................................................................ 3-59
8. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-61
9. MASTER VOLUME CIRCUIT DIAGRAM ............................................................................................. 3-63
10. CONTROL_A CIRCUIT DIAGRAM ....................................................................................................... 3-65
11. VFD CIRCUIT DIAGRAM...................................................................................................................... 3-67
12. MIC/ HP CIRCUIT DIAGRAM ............................................................................................................... 3-69
13. TUNER/ AUX CIRCUIT DIAGRAM ....................................................................................................... 3-71

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

1. ICs ......................................................................................................................................................... 3-73
2. CAPACITORS ....................................................................................................................................... 3-74

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

1. SMPS P.C.BOARD ............................................................................................................................... 3-75
2. MAIN P.C.BOARD ................................................................................................................................ 3-79
3. MASTER VOLUME P.C.BOARD .......................................................................................................... 3-83
4. CONTROL_A P.C.BOARD ................................................................................................................... 3-87
5. VFD P.C.BOARD .................................................................................................................................. 3-91
6. MIC/ HP P.C.BOARD ............................................................................................................................ 3-91
7. TUNER/ AUX P.C.BOARD ................................................................................................................... 3-93

3-1
 ONE POINT REPAIR GUIDE
1. NO POWER
If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-1. FUSE/ BRIDGE DIODE/ 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 > <BD901, BD902 > < Q902 ~ Q905 >
If F901 is not short-circuit, If BD901, BD902 is short-circuit, If Q902 ~Q905 is short (pin1-3),
replace it with a same replace it with a new one. replace it with a new one.
specifications one.

3-2
 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 > < Q911 ~ Q914 >

If F911 is not short-circuit, If Q911 ~ Q914 is short-circuit,
replace it with a same specifications one. replace it with a new one.

3-3
 ONE POINT REPAIR GUIDE
3. 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.

3-1. IC506
3-1-1. Solution
Replace IC506 on MAIN board.

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

1) Check the 5.6 VA (CN506) and DVCC 3.3 V (IC501) in standby mode.
 If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.3 V, check IC501.
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 KEY1 changes high to low while pressing the power button.
X500 and X501 work normally but, if you can not power on the set, replace the IC501 with a new one
on the MAIN board.

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

X500 X501
(24 MHz) (32.768 kHz)

< MAIN board top view >

3-4
 ONE POINT REPAIR GUIDE
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 VFD board.

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

1) Check if VKK, FL+ and FL- are output from SMPS to VFD via the MAIN board.
2) Check if the IC506 outputs VFD_RST, VFD_CLK, VFD_CS and VFD_STB to the VFD board.

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

3-5
 ONE POINT REPAIR GUIDE
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~IC709)

5-1-1. Solution
Replace IC700~IC709 on MAIN board.

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

1) Check the JK700, JK701 on your eyes.
2) Check the IC700~IC709 on your eyes.
3) Check the audio signal output check (pin13 of IC700~IC709).
4) Check the PWM Data input (pin3 of IC700~IC709)
5) Check PWM Output of IC601 (PWM IC)

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

IC700~IC709

< MAIN board top view >

3-6
 ONE POINT REPAIR GUIDE
6. NO POWER ON (STANDBY LED IS BLINKING)
It doesn’t turn on, and blinks standby LED(Red).

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

AMP FET : IRF6775

< MAIN board top view >

* You can see FET after removing heatsink.

* Notice for Service
Before repair Main Assy, you need to discharge SMPS.
Notice for FET service After then, open the connector.
- In case of RF6775, Metal case, FET Drain, You should try to change both of +/- FET and Driver IC
has electric potential. So be careful when you as a pair.
deal with it.

3-7
 ONE POINT REPAIR GUIDE
7. SPEAKER NO AUDIO
Speaker No Audio

7-1. AMP IC (IC700~IC709)

7-1-1. Solution
Replace IC700~IC709 on MAIN board.

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

1) Check supply voltage of AMP(CN700) & PWM signal
Normal supply voltage and signal  Check AMP IC.
Poor supply voltage  Check SMPS board.
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)

CN700
pin1, 6, 7, 12 : PGND,
pin2, 3, 4, 5 : +PVDD (+58 V),
pin8, 9, 10, 11 : -PVDD (-58 V)

< MAIN board top view >

pin5 of IC700  CSD

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

3-8
 ONE POINT REPAIR GUIDE
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 MCS 3.3 V, 1.2 VA

8-1-1. Solution
Please check and replace IC501, IC507 on MAIN board.

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

1) Check Voltage of IC501 pin3 on MAIN board.
 If IC501 pin3(about 4.9 V) & D50C Input 5.6 VA doesn’t come out, check 5.6 VA from SMPS board.
2) If IC501 pin3(about 4.9 V) is normal, check the PWR_CTRL(IC501 pin2) is high (about 3.3 V)
 If PWR_CTRL isn’t high, check pin B2 of IC506.
3) If PWR_CTRL is high if there’s no defective component then replace IC501.
4) If 3.3 V is normal, check 1.2 V output(pin2) voltage of IC507
 If 1.2 VA of IC507 (pin2) doesn’t come out, then replace IC507.

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

IC501

D50C

< MAIN board bottom view >

IC507

< MAIN board top view >

3-9
 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.

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 IC506 pin T12 on MAIN board.
2) If CHIP_RESET is high, Check the soldering status of 24 MHz crystal (X500).
3) If the crystal(X500) doesn’t oscillate, Check R55E, R563, C536, C53B around crystal (X500).
 If there’s no defective component, then replace X500.

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

XI

IC506
XO

X500

X500
< MAIN board top view >
< Signal waveform >

3-10
 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.

8-3. SERIAL FLASH (IC508)

8-3-1. Solution
Please check and replace IC508 on MAIN board.

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

1) If the crystal(X500) does oscillate, Check Serial Flash(IC508) on MAIN board.
 Check pin8(VCC), pin6(CLK), pin1(CS), pin2(DO), pin5(DI) of below waveform.
2) If pin8, 6, 1, 2, 5 doesn’t come out, Check damping or pull-up resistors of IC508.
 If damping resistor of IC508 is OK, then replace IC508. (it need to download program)
3) After change IC508, if It is still not below waveform, Check IC506 (DSP IC).

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

VCC
CS#
CLK
DO

IC508

< MAIN board top view > < Signal waveform >

3-11
 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.

8-4. SDRAM (IC509)

8-4-1. Solution
Please check and replace IC509 on MAIN board.

8-4-2. How to troubleshoot (Countermeasure)

1) Check below waveform & soldering status of SDRAM (IC509) on MAIN board.
 If pin17(#CAS), pin18(#RAS), pin19(#CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,
Check damping resistor (AR501, AR502, AR504, AR505).
2) If resistor is OK, then replace IC509(SDRAM).
3) After change IC509, if It is still not below waveform, Check IC506(DSP IC).

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

V CC
Reset
a ddress

da ta

IC509

/ CS

R AS

/WE

C AS

< MAIN board bottom view > < Signal waveform >

3-12
 ONE POINT REPAIR GUIDE
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 SERVO_3.3 V and X400.
2) Check the SPIN- & SPIN+ from IC400 to CN401 for driving SPINDLE motor.
 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

X400
zwT

< Waveform of SP- & SP+ < MAIN board top view >
for driving SPINDLE motor >

3-13
 ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading data from a CD
disc if the servo motors in MD don’t work. This step is for checking the sled motor among them.

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 pin15 of IC401.
 If no signal, check SERVO_3.3 V and X400.
2) Check the SLED+ & SLED- from IC400 to CN401 for driving SLED motor.
 If no signal, check +7 V for IC401.
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
X400

< Waveform of SLED- & SLED+ < MAIN board top view >
for driving SLED motor >

3-14
 ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading data from a CD
disc if the servo motors in MD don’t work. This step is for checking the tray open/close motor
among them.

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 IC506 to IC400.
 If no signal, check +7 V to IC400.
2) Check LOAD ± from IC400 to CN401 for driving the tray open/ close motor.
 If no signal, check +7 V to IC400. 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 LO+
svROylkP pin4 of CN401

tv{†vwlu LO-
tv{†jsvzl pin2 of CN401

< Waveform < MAIN board top view >

for driving TRAY open/ close motor >

MOT_CLOSE
pin6 of IC400

MOT_OPEN
pin7 of IC400

< MAIN board bottom view >

3-15
 ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading data from a CD
disc if the pickup module in MD doesn’t work. This step is for checking the laser tracking actuator.

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 SERVO_3.3 V and X400.
2) Check TR- & TR+ from IC400 to CN400 for driving the tracking actuator.
 If no signal, check +7 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)

TR-
pin17 of CN400

TR+
pin16 of CN400
{yT ›–Gju[WW
{yRG›–Gju[WW

< Waveform of TR± < MAIN board top view >

for driving TRACKING actuator >

3-16
 ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading data from a CD disc
if the pickup module in MD doesn’t work. This step is for checking the laser focusing actuator.

9-5. LASER FOCUSING ACTUATOR

9-5-1. Solution
Replace IC401 or IC400 on MAIN board.

9-5-2. How to troubleshoot (Countermeasure)

1) Check the FDO signal from pin13 of IC401.
 If no signal, check SERVO_3.3 V and X400.
2) Check F- & F+ from IC400 to CN400 for driving the focusing actuator.
 If no signal, check +7 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)

F+
pin15 of CN400

F-
pin18 of CN400
mRG›–Gju[WW

mT ›–Gju[WW

< Waveform of F± < MAIN board top view >

for driving FOCUSING actuator >

3-17
 ONE POINT REPAIR GUIDE
10. NO SOUND
There is no sound output in the USB function, repair the set according to the following guide.

10-1. USB FUNCTION

10-1-1. Solution
Replace IC506, IC50B, IC50D on MAIN board.

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

1) Check USB_5 V to MAIN board.
 If +5.6 VA to pin2 of IC50B, IC50D(LDO) doesn’t come out, check pin8 & 9 of CN506.
 If +5.6 VA is normal LED_5 V of IC50B, IC50D pin3 doesn’t come out, then replace IC50B, IC50D.
2) Check “Digital audio AMP block”.

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

D+

D-

USB D+ / D- (CN505 pin3, 9 & 4, 8)

< USB function signal flow > < Waveform of USB D± signal >

3-18
 ONE POINT REPAIR GUIDE
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 IC204, IC506, IC601 on MAIN board.

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

1) Check AUX1/2_L/R signals to IC204(pin7, 8, 11, 12).
2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC204.
3) Check if ADC/MIC_DATA is entered from IC204 to IC501.
 If no signal, check ADC_5 V & ADC_3.3 V for IC204.
4) Check the following I2S signal flow from IC506 to IC601.
 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)

AUX1/2_L/R

AUX_L/R
IC204 AUX
CS5346

MCS_MCLK ADC/MIC_DATA IC204

IC506 MCS_BCK
IC601
MLC3730 MCS_LRCK
PS9860 IR AMP

MCS_MCLK to R256
IRS2092+IRF6775
MIX_DATA_OUT PWM

MCS_LRCK to R255
MCS_BCK to R252
ADC/MIC_DATA to R251

< AUX function signal flow > < MAIN board bottom view >

3-19
 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 IC204, IC506, IC601 on MAIN board.

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

1) Check PT_L/R signal from MIC board to MAIN board.
2) Check if PT_L/R is entered pin5 & 7 of CN5009.
3) Check PT_L/R signals to IC204(pin26, 27).
4) Check if ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC501 to IC204.
5) Check if ADC_DATA is entered from IC204 to IC501.
 If no signal, check ADC_5 V & ADC_3.3 V for IC204.
6) Check the following I2S signal flow from IC506 to IC601.
 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.
 If AMP is damaged, replace it with a new one.

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

POT. IN
{TG
{ POT_L/R
IC204
CS5346 Board

MCS_MCLK ADC/MIC_DATA
IC204
IC506 MCS_BCK
IC601 IR AMP
MCS_LRCK
MLC3730
MIX_DATA_OUT
PS9860
PWM
IRS2092+IRF6775
PT_L/R
MCS_MCLK to R256
MCS_LRCK to R255
MCS_BCK to R252
ADC/MIC_DATA to R251

< PORT. IN function signal flow > < MAIN board bottom view >

3-20
 ONE POINT REPAIR GUIDE
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 IC204, TU3T01 on MAIN board.

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

1) Check if TUNER_L/R is entered from TU3T01(pin1, 3) of to IC204(pin23, 24).
 If no signals, Check +3.3 V for Tuner power.
 Check the Tuner control signals (CLK, DAT, CE, RST, GPO2) are entered from IC506 to TU3T01.
If it doesn’t work, replace TUNER with a new one.
2) Check ADC_BCK, ADC_LRCK, & DAC_MCLK are entered from IC506 to IC204.
3) Check if ADC_DATA is entered from IC204 to IC506.
 If no signal, check ADC_5 V & ADC_3.3 V for IC204.
4) Check the following I2S audio signal flow from IC506 to IC601.
 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)

G
TUNER

IC204
{TG
{ TUNER_L/R
Jack
TUNER_L/R IC204
CS5346 Board

MCS_MCLK ADC/MIC_DATA

IC506 MCS_BCK
IC601 IR AMP
MCS_MCLK to R256
MCS_LRCK to R255
MLC3730 MCS_LRCK IRS2092+IRF6775
PS9860
MIX_DATA_OUT PWM

MCS_BCK to R252
ADC/MIC_DATA to R251

< TUNER function signal flow > < MAIN board bottom view >

3-21
 ONE POINT REPAIR GUIDE
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 IC201, IC205 on MAIN board.

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

1) Check MIC_SIG signal to pin3 of CN5009.
 If no signal, Check the signal to pin13 of CN3M01 on the MIC board.
2) Check if MIC_SIG is entered from pin3 of CN5009 to pin3 to IC201 (MIC AMP).
3) Check if the amplified signal comes out from pin4 of IC201.
 If no signal output, check +12 V for IC201, replace IC201 with a new one if it has a problem.
4) Check if MIC_BCK, MIC_MLCK & MIC_LRCK is entered from IC506 to IC205.
Check if MIC_DATA_IN is entered from pin9 of IC205 to pin T1 of IC506.
 If no signal, check DVCC_5 V for IC205. If it is abnormal, change replace it a new one.
5) Check the following I2S signal flow from IC205 to IC601.
 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)

IC201

MIC IN
MIG_SIG IC201 MIC
IC205
PCM1808 S4308 Board

MCS_MCLK ADC/MIC_DATA

IC506 MCS_BCK
IC601 IR AMP
IC205 MIC_SIGOUT
MLC3730 MCS_LRCK
PS9860 IRS2092+IRF6775

MIX_DATA_OUT PWM

MIC_DATA_IN to R222
MCS_BCK to R223
MCS_MCLK to R225
MCS_LRCK to R224
< MIC IN function signal flow > < MAIN board top view >

3-22
 ONE POINT REPAIR GUIDE
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 IC506 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 CN502.
 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 CN502 to pin K1, L1 to IC506 (DSP).
3) Check the following I2S signal flow from IC506 to IC601.
 If there is any trouble, check the power for each IC.
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

IC506 IC601
MLC3730 PS9860
PWM
MCS_BCK
MCS_LRCK
MIX_DATA_OUT 3.3 V

IR AMP BT_RX CN502

IRS2092+IRF6775

BT_TX

< Bluetooth function signal flow > < MAIN board top view >

3-23
 ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD

No output 5.6 VA

NO
Is the F901 normal? Replace F901 (same fuse).

YES

NO
Is BD901 or BD902 normal? Replace BD901 or BD902.

YES

Is the VCC NO
(11 V ~ 25 V) supplied to IC901 Is D960/ D961 normal?
pin4?

YES

Power line of MAIN PCB is short. Check or replace D960/ D961.

No 12 V

Is the NO
VCC 13 VA supplied to IC951 Check or replace D962.
pin2?

YES

Is there NO
‘H’ signal at IC951 Check P_CTL from IC506 (MAIN DSP).
pin1?

YES

Check and replace IC951.

Or check line of MAIN PCB is short or not.

3-24
 ELECTRICAL TROUBLESHOOTING GUIDE

No -5 V

Is the NO NO
VCC -7 VA supplied to IC953 Is the R965 normal? Check or replace R965, D959.
pin2?

YES YES

Check or replace Q951.

Is there NO Check P_CTL

‘H’ signal at Q953
Base? from IC506 (MAIN DSP).

YES

Check or replace Q953, Q957.

Or check line of MAIN PCB is short or not.

No output AMP gate line

Is the VCC NO NO
14 VA supplied to IC952 Is the R952 normal? Check or replace R952.
pin1 to pin3?

YES YES

Check and replace IC952.

Or check line of MAIN PCB is short or not.
Check or replace D951, D952.

3-25
 ELECTRICAL TROUBLESHOOTING GUIDE

No AMP output

Is the NO Is the NO Check PFC P.CTL

C903, C913 Voltage PFC P.CTL OK?
about 395 V? from IC506 (MAIN DSP).

YES YES

Is the NO
VCC 12 V supplied to Replace D908, Q955, PC903.
IC904 pin16?

YES

Check or replace
IC904, Q907 ~ Q910.

YES Is the NO Check AMP P.CTL

Is F911 normal? AMP P.CTL OK? from IC506 (MAIN DSP).

NO YES

Is the NO
Replace F911. VCC 12 V supplied to Replace D908, Q956, PC902.
IC902 pin8?

NO
YES
Q911 ~ Q914 OK?

NO

Check or replace IC902 and

Check or replace D953 ~ D956.
Replace Q911 ~ Q914. Check Q911 ~ Q914 gate(pin2)
Check line of MAIN PCB is short or not.
Components (Resistors, Diodes).

3-26
 ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART

Power on.

“HELLO” NO CN3B03 NO
Display on MLD cable connection Check 16p FFC cable.
OK? OK?

YES YES

CN3B03
NO
pin3, 7, 11, 15 power Check SMPS board.
OK?

YES

CN3B03
NO
pin10, 12, 14, 16 data signal Check MAIN board.
OK?

YES

NO
All signal & power OK? Replace VFD301.

Top LED
(LD3B01~LD3B12) NO CN505 pin1 NO
Check SMPS board.
(LD3A01~LD3A06) LED_12 V OK?
turn on?

YES YES

Check
NO
CN3B02 pin8, 37, 38 Check MAIN board.
I2C data OK?

YES

Replace LED.
(LD3B01~LD3B12)
(LD3A01~LD3A06)

When turn Check

NO NO
the volume, count is CN3B02 pin8, 37, 38 Check FFC cable.
change? I2C data OK?

YES YES

System part OK. Check MAIN board.

3-27
 ELECTRICAL TROUBLESHOOTING GUIDE
3. NO AUDIO CHECK

CD FUNCTION

Can NO NO Is Motor_open/close OK?

LOAD +, - OK?
disc insert? (IC400 pin7, 6)

YES
YES YES

Check IC506.

Is motor impedance NO
Check loading motor.
about 12 Ω?

Check IC400.

NO

NO OPU driving NO Focusing/

Disc reading OK? Tracking/ Sled signal
(Focusing & Tracking) OK? OK?

YES YES

Check OPU. NO MON_MPD(CN400 pin22)

(Pick-up module) About 180 mV?

NO IC401 NO Check FFC cable

IC401 pin34, 35, 36 RF & Servo signal
I2S output signal OK? OK? to CN400, CN401.

YES YES

IC506 pin N1, N2, N4 NO

I2S input signal OK? Check IC506.

YES

3-28
 ELECTRICAL TROUBLESHOOTING GUIDE

USB FUNCTION

When insert USB, NO IC50B, IC50D NO

IC506 pin U7, U8, A7, A8 USB Power +5 V OK? Replace IC50B or IC50D.
USB_D signal OK?

YES YES

AUX FUNCTION

IC204 NO
pin7, 8, 11, 12 AUX input signal Check audio cable.
OK?

YES

IC204 NO
pin42, 43, 44 I2S input signal Check IC506.
OK?

YES

IC204 NO
pin41 ADC_DATA_IN output Replace IC204.
signal OK?

YES

3-29
 ELECTRICAL TROUBLESHOOTING GUIDE

PORTABLE FUNCTION

IC204 NO
pin26, 27 PT_L/R input signal Check MIC & HP board.
OK?

YES

IC204 NO
pin42, 43, 44 I2S input signal Check IC506.
OK?

YES

IC204 NO
pin41 ADC_DATA_IN output Replace IC204.
signal OK?

YES

TUNER FUNCTION

IC204 NO TU3T01 NO
pin23, 24 TUNER_L/R input TUNER_L/R output Check +3.3 V of TU3T01.
signal OK? signal OK?

YES YES

IC204 NO
pin42, 43, 44 I2S input Check IC506.
signal OK?

YES

IC204 NO
pin41 ADC_DATA_IN output Replace IC204.
signal OK?

YES

3-30
 ELECTRICAL TROUBLESHOOTING GUIDE

IC506 NO
pin D1, D2, E1 I2S clock Check IC506.
signal OK?

YES

IC506 NO
pin E2, E4 I2S data signal Check IC506.
OK?

YES

NO
IC601 PWM data output signal OK? Replace IC601.

3-31
 ELECTRICAL TROUBLESHOOTING GUIDE
4. NO LIGHTING (SPEAKER LED)

Power on

Speaker LED (3 Color) NO Check

is turn on? Q500C ~ Q500E, Q5006 ~ Q5008.

YES

IC50C LED_5V NO
Check IC50C.
OK?

YES

Check speaker.

3-32
 WAVEFORMS OF MAJOR CHECK POINT
1. DSP (IC506/ IC5001)

XI XI
1 3

XO XO
4
2

Fig 1-1. Crystal of RTC 32.768 MHz Fig 1-2. Crystal of system 24 MHz
(X501) ( Main DSP : R55E, R563 / Sub. DSP : R5037, R503C )
X500/ X5000

3 4

4
1 2
3

3-33
2. PWM (IC601)

5 XI 7

6
XO 9

Fig 2-1. Crystal 24.576 MHz Fig 2-2. DSP to PWM I2S
(IC601 pin4, 5) X600 IC601 pin26~30

7 8

6 5

3-34
3. SERVO (IC401)

XI

10

12
XO

11

Fig 3-1. Crystal 16.9344 MHz Fig 3-2. CD-16M

(X400) (IC401 pin31)

11

10

12

3-35
4. MOTOR DRIVER (IC400)

17
13
14 18

15
16

Fig 4-1. LO- & LO+ / MOT_OPEN & MOT_CLOSE Fig 4-2. SL- & SL+ for Driving SPINDLE Motor
for Driving TRAY Motor (IC400 pin11, 12)
(IC400 pin6, 7, 9, 10)

19

20

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

(IC400 pin17, 18)

16

14
18 17 13 15
20 19

3-36
5. ADC (IC204) 6. USB (CN505)

21

22
24
23
25

Fig 5. ADC I2S Fig 6. USB D+/ D-

(IC204 pin42, 43, 44) (CN505 pin3, 4, 8, 9)

21 22

23

24 25

3-37
7. BLUETOOTH (CN502)

26 B T_TXBT_TX
BT_TX

27 BT_RX
BT_RX

BT_RST
28
BT_RST

Fig 7. TP508/ TP509/ TP50C

26 27 28

3-38
WIRING DIAGRAM

TUNER
Module

Tuner

SMPS
Main

10P, 1mm
Bluetooth
MD

MIC

VFD

FFC

A CONTROL

Master Volume Harness

Harness

3-39 3-40
BLOCK DIAGRAMS
1. SYSTEM BLOCK DIAGRAM

MCS_BCK/LRCK/MCLK/DATA
USB1 USB2 DAC OP AMP
CD_RST PCM5101 DRV632
(VCC50) A,B,C,D,E,F,PD SERVO
BU9546 DRM_WEN/CAS/
LD
P/UP (4X Speed) RAS/SEL/CLK/CKE
SPDO/SLDO CD_RW/ MCLK/ LRCK/ BCK, (+3.3 V_CD, VCC1.2) 16 MB(128 Mb)
CD_DAT M00_15
/FOD/TRD
A00_16
SDRAM

AM5890 MOT_MUTE,CLOSE,OPEN
EN
D2S+/ - MLC3730
M LOAD±,SLED±, USB
U S S/W
Motor Drive
SPIN±,TR±,F± Sub. DSP 8 MB(64 Mb)
SF_DI/DO
SF_CS/SCK S/Flash IC200
DECK
MECHANISM
OP_SW,CL_SW,UP_SW,DN_SW,D_SENSE ADC
USB_SW
CS5346
DRM_WEN/CAS/
RAS/SEL/CLK/CKE (+3.3 V_CD, VCC1.2) UART_RX/TX
32 MB(256 Mb)
M00_15 USB_D2_DATA
SDRAM A00_16 MCS_BCK/LRCK/MCLK
MLC3730
For AUX
16 MB(128 Mb) SF_DI/DO
Main DSP
ADC_DATA
S/Flash SF_CS/SCK
PGPC08
For MIC
IC PRE,AMP
EEPROM E2PROM
CLK/DAT PCM1808 S4308

PWM_LRCK/BCK/DATA
(± 5 V) (± 57 V) BTL SE

DSP_O_DATA
IR RMC
MCS_BCK/LRCK, MCLK
IR_IN_WL+
Receiver 2
DAC_DATA
MUTE, DET

DRIVER FET WL
AMP_OSC OP AMP IR_IN_WL - IRS2092 IRF6775
AZ4580
WL_OUT_P/N X2 X4
IR_IN_FL+
FL_OUT_P/N DRIVER FET FL
OP AMP
PS9860 IR_IN_FL - IRS2092 IRF6775
(+3.3 VA,+12 V) AZ4580
PWM SL_OUT_P/N X2 X4

SR_OUT_P/N
FRONT VFD_STB/CLK/DO/RST, DAC SL
IR_IN_SL
VKK,FL+/ - PCM5101
SPK_LED_CTRL

IR DRIVER FET
STBY_LED, OP AMP
Receiver 1 IR_IN_SR IRS2092 IRF6775
RMC,KEY1 AZ4580
X2 X4 SR

VFD HP AMP IR_IN_WR+

Slide A/B, Flash A/B, TPA6132
DIG301 OP AMP
DRIVER FET WR
DJ_A/B,KEY1~4, IRS2092 IRF6775
IR_IN_WR -
Search_A/B, DJ_VOL_A/B, AZ4580
WR_OUT_P/N X2 X4
Volume/ M_VOL_A/B
IR_IN_FL+
F_LED_CLK/DAT
Key/switch Fader_A/B
Speaker Lighting FR_OUT_P/N OP AMP
DRIVER FET FR
IR_IN_FL - IRS2092 IRF6775
AZ4580
X2 X4

3-41 3-42
2. SMPS BLOCK DIAGRAM
VFD
MAIN SMPS 39 V VKK
IC
Ǹ
(STR-2A153D) 4.5 V FL(+/ -)
Flyback
MAIN - 5V OPAMP
Vcc TRANS
PFC Out u-com / BT
(395 V ) 5.6 VA
Ǹ USB / MPEG
PFC IC Ǹ
(R2A20112A) FET LED
Ǹ 14 VA
Totem 23.8 A Motor Drive
pole 600 V + 12 V FAN/Mic/
Interleaved 4 EA Relay
CRM Gate
On/Off
On/Off PFC
Drive P-CTRL
On/Off

AMP
AC Line On/Off Ǹ Ǹ P-CTRL
Filter Block
(Varistor, Vcc F_L
X-Cap Half
Bridge GATE
Line Filter F_R
Thermistor) Relay LLC
TRANS
Half Bridge (AMP) Mid_ L
LLC
FET Digital
Pulse 20 A +PVDD
Resonant IC Trans 600 V (58 V )
Power
Mid_R
(ICE1HS01G) 4 EA Half Ǹ
AMP
Gate Bridge
Drive SW_L
AC LLC
TRANS Ǹ

(AMP) -PVDD SW_R

(-58 V )
4.2 CH 4400 W

3-43 3-44
3. POWER BLOCK DIAGRAM

VKK 25 mA

370 mA VFD IC204 IC601 IC401 IC50A IC5002 IC5003

IC200 IC203
FL ± ADC IC PWM RF IC USB SW FLASH SDRAM TUNER
PCM5101 TPA6132A2 Bluetooth
CS5346 PS986 R BU9546 TS3USB221 8 MB W9812G6
77 mA 3.2 mA 10 mA 80 mA 22 mA 10 mA 30 uA 38 mA 20 mA 15 mA 70 mA
IC501
+5.6 VA ) DVCC_3.3 V
2 ˧MCS_3.3 V MCS_3.3 V MCS_3.3 V
555.2 mA
80 mA 80 mA IC5000
+1.2 VA 160 mA LDO
7 50 mA
IC5001 AZ1117(1 A)
Option IC506
34.2 mA SUB DSP DIG301 Expander
IC509 IC505 IC508 RMC*2 MAIN DSP DVCC_1.2 V
IC504 IC503 VFD
MLC3730 MLC3730 BU2090*2
1 mA SDRAM LDO FLASH EEPROM Chip Reset 301~ 2
+3.3 VA W9825G6 AZ1117 W25Q128 M24C16 50 mA 5 mA
AZ7027
83 mA RTC3.0
IC502 15 mA 20 mA 2 mA 2 mA 6 mA 20 mA 10 mA
LDO(1 A)
AZ1117 IC204
IC500 ADC IC PICK UP
SMPS +4.8 VA 2 mA 2 mA P- SENSE CS5346
FRONT RED
LED(18 EA)
FRONT WHITE
LED(6 EA)
AZ7027 20 mA 80 mA
340 mA IC202 180 mA 60 mA
LDO(1 A)
IC602~ 6 IC700~ 9
LM37102 +5 V_ADC POWER OP AMP * 5 IRS2092 * 10
IC600 AZ4580 AMP IC
155 mA LDO(1 A) 45 mA 110 mA
+5 V_AMP
LM37102D
IC3U01 +5 V / 1 A
1A LM37102D IC201 FAN*3
1A USB PWR +5
+ V/ 1 A S4308
LM37102D
902 mA 2 mA 300 mA* 3
+12 V

5 00 mA
500 LED_5 V
LED_5 A SPK LED * 18
3 A)
28 IC602~ 6 IC700~ 9
OP AMP * 5 IRS2092 * 10
225
2 25 mA
A +9 V 350 mA AZ4580 AMP IC IRF6775M * 20
31
-5V 35 mA 110 mA FET
145 mA 250 mA
- B+12 V

- 57 V

+57 V

3-45 3-46
 IMPORTANT SAFETY NOTE :

WHEN SERVICING THIS CHASSIS, UNDER NO SCHEMATIC FOR EASY IDENTIFICATION. THIS 1. Shaded( ) parts are critical for safety. Replace only
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER with specified part number.

CIRCUIT DIAGRAMS BE MODIFIED OR ALTERED WITHOUT PERMISSION

FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED ONLY WITH TYPES
FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
2. Voltages are DC-measured with a digital voltmeter
during Play mode.

1. SMPS - POWER #1 CIRCUIT DIAGRAM IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.

SPECIAL COMPONENTS ARE SHADED ON THE
THE SET IS NOT DELAYED UNTIL THE NEW
SERVICE LITERATURE IS PRINTED.

No Power No Power
BD901 or BD902 is Defective Q902 ~ Q905 are Defective
12

11

10

No Power
F901 is Defective
3

2
Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.

CAUTION:
Danger if fuse is incorrectly replaced.
1 Replace only with the type identical to fuse rating
and(or) model name described in main label. SMPS 1/2
EAX66225601_1.5(5)-SD(#1)
2014. 12. 22
A B C D E F G H I J K L M N O P Q R S T

3-47 3-48
 IMPORTANT SAFETY NOTE :

WHEN SERVICING THIS CHASSIS, UNDER NO SCHEMATIC FOR EASY IDENTIFICATION. THIS 1. Shaded( ) parts are critical for safety. Replace only
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER with specified part number.
BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter
FROM THE LG CORPORATION. ALL COMPONENTS IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode.
SHOULD BE REPLACED ONLY WITH TYPES PERFORMANCE IMPROVEMENT CHANGES INTO
2. SMPS - POWER #2 CIRCUIT DIAGRAM IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.
SPECIAL COMPONENTS ARE SHADED ON THE
THE SET IS NOT DELAYED UNTIL THE NEW
SERVICE LITERATURE IS PRINTED.

12

11

10

No Power
F911 is Defective No Power
7
Q911 ~ Q914 are Defective

1 Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock. SMPS 2/2
EAX66225601_1.5(5)-SD(#2)
2014. 12. 22
A B C D E F G H I J K L M N O P Q R S T

3-49 3-50
3. MAIN - MAIN DSP CIRCUIT DIAGRAM

12

11
26 27 28

10

3 4 1 2
2

1
: WAVEFORM NUMBER
24 25 MAIN DSP
EAX66091702_1.0(1)-SD(#1)
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-51 3-52
4. MAIN - SUB DSP CIRCUIT DIAGRAM

12

11

10

4
2 3

1
: WAVEFORM NUMBER SUB DSP
EAX66091702_1.0(1)-SD(#2)
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-53 3-54
5. MAIN - SERVO CIRCUIT DIAGRAM

12

11

11
10

10
9

12
4

3
16

14
18 17 13 15
2

20 19

1 : WAVEFORM NUMBER
SERVO
EAX66091702_1.0(1)-SD(#3)
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-55 3-56
6. MAIN - ADC/ DAC CIRCUIT DIAGRAM

12

11

10

21 22

4
23

1
: WAVEFORM NUMBER ADC/ DAC
EAX66091702_1.0(1)-SD(#4)
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-57 3-58
7. MAIN - PWM CIRCUIT DIAGRAM

12

11

10

6 9

5 7 8

6 5

1
: WAVEFORM NUMBER PWM
EAX66091702_1.0(1)-SD(#5)
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-59 3-60
8. MAIN - AMP CIRCUIT DIAGRAM

12

11

10

1
AMP
EAX66091702_1.0(1)-SD(#6)
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-61 3-62
9. MASTER VOLUME CIRCUIT DIAGRAM

12

11

10

1
MASTER VOLUME
EAX64870202_1.0(0)-SD
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-63 3-64
10. CONTROL_A CIRCUIT DIAGRAM

12

11

10

1
CONTROL_A
EAX64870302_1.0(0)-SD
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-65 3-66
11. VFD CIRCUIT DIAGRAM

12

11

10

1
VFD
EAX65071102_1.0(0)-SD
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-67 3-68
12. MIC/ HP CIRCUIT DIAGRAM

12

11

10

1
MIC/ HP
EAX66187402_1.0(0)-SD
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-69 3-70
13. TUNER/ AUX CIRCUIT DIAGRAM

12

11

10

1
TUNER/ AUX
EAX66187502_1.0(0)-SD
2015. 01. 08
A B C D E F G H I J K L M N O P Q R S T

3-71 3-72
CIRCUIT VOLTAGE CHART
1. ICs 2. CAPACITORS
Location SPEC [V, mW] VOLTAGE [V] Location SPEC [V, mW] VOLTAGE [V] 100 V-10 % 240 V/50 Hz+10 %
Value Capacitor Voltage_Spec
IC200, IC203 CPVDD/AVDD/DVDD : CPVDD/AVDD/DVDD : IC601 AVDD,AVDD_PWM, DVDD_ AVDD,AVDD_PWM,DVDD_ Location Measured voltage Measured voltage
[uF] [V]
D/A Converter 3.0~3.6 V 3.29 V PWM CORE : 0~3.6 V CORE :3.29 V [V] [V]
IC201 IC602~IC606 SMPS Board
VCC: 5~14 V VCC: 11.43 V VCC: ~20 V VCC: 5.06 V
PRE Amplifier OP Amplifier
C903 330 uF 450 V 395 V 395 V
IC202, IC600 Vin : 2.25~16 V Vin : 5.56 V IC70C~IC70E
VCC: ~20 V VCC: 5.1 V C911 100 uF 50 V 14.8 V 15.8 V
LDO Voltage Requlator Vout : 1.25~15 V Vout : 5.01 V OP Amplifier
C913 330 uF 450 V 395 V 395 V
VA : 4.75~5.25 V VA : 4.99 V IC700~IC709 VB : 0~220 V VB : -46.5 V
IC204 VD : 3.13~3.47 V VD : 3.33 V Power Driver VAA : MAX 210 V VAA : 5.01 V C932 22 uF 50 V 14.8 V 14.8 V
A/D Converter VLS : 3.13~5.25 V VLS : 3.33 V C936 1000 uF 16 V 5.65 V 5.65 V
VLC : 3.13~5.25 V VLC : 3.33 V
C947 100 uF 50 V 37.2 V 37.5 V
IC206, IC207
VDD : 2.3~5.5 V VCC: 3.28 V C956 470 uF 16 V 5.1 V 5.2 V
Audio Amplifier
IC3A01,IC3B01 C957 100 uF 16 V -5 V -5 V
Vin : 2.7~5.5 V Vin : 3.33 V
Clock Driver C958 220 uF 25 V 12 V 12 V
IC3A02 Vin : 6~12 V Vin : 5.55 V C964 100 uF 25 V 11.99 V 11.98 V
Voltage Regulator Vout : 4.88~5.12 V Vout : 5.01 V
C966 1000 uF 80 V -58 V -58 V
IC3B02 Vin : 6~12 V Vin : 5.59 V
Voltage Regulator Vout : 4.88~5.12 V Vout : 5.01 V C968 1000 uF 80 V 58 V 58 V

IC400 C975 330 uF 25 V 13.2 V 13.2 V

VCC : 4.3~13.2 V VCC : 8.19 V
Motor Driver C993 68 uF 450 V 138 V 336 V
IC401 DVDD,AVDD : 2.7~3.6 V DVDD,AVDD : 3.21 V Main Board
RF, Servo VDD_CORE : 1.75~1.95 V VDD_CORE : 1.85 V
C218 4.7 uF 50 V 1.9 V 1.9 V
IC402 VIN: 13.5 V
VIN : 3.5~28 V C224 100 uF 16 V 11.2 V 11.2 V
DC/DC Converter VOUT: 8.77 V
C232 47 uF 16 V 4.9 V 4.9 V
IC50A
VCC: 2.3~3.6 V VCC: 3.29 V
Analog Switch C247 47 uF 16 V 4.9 V 4.9 V
IC50C VIN: 13.5 V C279 100 uF 16 V 3.2 V 3.2 V
VIN : 3.5~28 V
DC/DC Converter VOUT: 4.83 V C402 100 16 V 4.9 V 4.9 V
IC500 Vcc : 3.9 V C404 47 uF 16 V 3.2 V 3.2 V
VCC: Max 18 V
Voltage Detector Vout : 2.9 V
C40D 47 16 V 1.1 V 1.1 V
IC501 Vin : 2.5~6.5 V Vin : 5.56 V
LDO Voltage Requlator Vout : 2.5~5 V Vout : 3.29 V C414 47 16 V 1.5 V 1.5 V
IC502 Vin : Max 12 V Vin : 4.8 V C416 3.3 uF 50 V 1.1 V 1.1 V
Voltage Regulator Vout : Max 10 V Vout : 3.3 V C41F 220 uF 16 V 8.7 V 8.7 V
IC503 Vcc : 3.32 V C5003 47 uF 16 V 1.1 V 1.1 V
VCC: Max 18 V
Voltage Detector Vout : 3.32 V
C504 47 uF 16 V 3.2 V 3.2 V
IC504
VCC : 1.8~5.5 V VCC : 3.34 V C50D 1000 uF 6.3 V 3.3 V 3.3 V
EEPROM
IC508 C551 220 uF 6.3 V 3.1 V 3.1 V
Vcc : 2.7~3.6 V Vcc : 3.33 V
Serial Flash Memory C601 47 uF 16 V 5V 5V
IC507 VIN: 5.57 V C603 220 uF 16 V 3.2 V 3.2 V
VIN : 3.5~28 V
DC/DC Converter VOUT: 1.2 V
C605 100 uF 16 V 1.2 V 1.2 V
IC509
VDD,VDDQ : 3.0~3.6 V VDD,VDDQ : 3.29 V C717 2200 uF 80 V 58.3 V 58.3 V
SDRAM
IC5000 Vin : Max 12 V Vin : 3.29 V C718 2200 uF 80 V 58.3 V 58.3 V
Voltage Regulator Vout : Max 10 V Vout : 1.19 V C719 2200 uF 80 V 58.3 V 58.3 V
IC5001, IC506 VDD12 : 1.08~1.32 V VDD12 : 1.19 V C71B 2200 uF 80 V 58.3 V 58.3 V
DSP VDD33 : 3.0~3.6 V VDD33 : 3.27 V
C724 2200 uF 80 V 58.3 V 58.3 V
IC5002
Vcc : 2.7~3.6 V Vcc : 3.29 V C726 2200 uF 80 V 58.3 V 58.3 V
Serial Flash Memory
C728 2200 uF 80 V 58.3 V 58.3 V
IC5003
VDD,VDDQ : 3.0~3.6 V VDD,VDDQ : 3.29 V
SDRAM

3-73 3-74
PRINTED CIRCUIT BOARD DIAGRAMS
1. SMPS P.C.BOARD
(TOP VIEW)

3-75 3-76
 NOTE) Warning
Parts that are critical with respect to risk

SMPS P.C.BOARD of fire or electrical shock.

(BOTTOM VIEW)

3-77 3-78
2. MAIN P.C.BOARD
(TOP VIEW)

3-79 3-80
MAIN P.C.BOARD
(BOTTOM VIEW)

3-81 3-82
3. MASTER VOLUME P.C.BOARD
(TOP VIEW)

3-83 3-84
MASTER VOLUME P.C.BOARD
(BOTTOM VIEW)

3-85 3-86
4. CONTROL_A P.C.BOARD
(TOP VIEW)

3-87 3-88
CONTROL_A P.C.BOARD
(BOTTOM VIEW)

3-89 3-90
5. VFD P.C.BOARD
(TOP VIEW) (BOTTOM VIEW)

6. MIC/ HP P.C.BOARD
(TOP VIEW) (BOTTOM VIEW)

3-91 3-92
7. TUNER/ AUX P.C.BOARD
(TOP VIEW) (BOTTOM VIEW)

3-93 3-94