LG CM4730, CMS4630F, CMS4530W Schematic

MODEL: CM4730 (CM4730, CMS4630F, CMS4530W)SERVICE MANUAL

Internal Use Only

Website http://biz.lgservice.com

Mini Hi-Fi System

SERVICE MANUAL

MODEL:

CAUTION

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

3102,MAY03580867NFA:ON/P

CM4730

(CM4730, CMS4630F, CMS4530W)

CONTENTS

SECTION 1 ........ GENERAL

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

SECTION 3 ........ ELECTRICAL

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

1-1

SECTION 1

SUMMARY

CONTENTS

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

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

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

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

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

1. AUDIO PROGRAM ................................................................................................................................... 1-8

2. CD PROGRAM ......................................................................................................................................... 1-9

3. EQ PROGRAM ....................................................................................................................................... 1-10

SPECIFICATIONS ..................................................................................................................................... 1-11

1-2

SERVICING PRECAUTIONS

NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

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

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

Storage in conductive bag

Drop impact

2. Repair notes

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

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

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

4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

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

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

Pressure

Magnet

How to hold the pick-up

Cotton swab

Conductive Sheet

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

1-3

Pressure

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

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

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

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1 MΩ)

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 MΩ)

Resistor
(1 MΩ)

Conductive
Sheet

1-4

ESD PRECAUTIONS

Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.

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

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

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

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

generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.

6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).

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

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

SAFETY PRECAUTIONS.

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

CAUTION. GRAPHIC SYMBOLS

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

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

1-5

HIDDEN KEY MODE

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

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

 Front Key : STOP
 RCU Key : STOP

2. Check Version and Option code

 Front Key : STOP
 RCU Key : PLAY/PAUSE
 You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.

3. Clear EEPROM

 Front Key : STOP
 RCU Key : SKIP-

4. Edit EEPROM

 Front Key : STOP
 RCU Key : SKIP+
 You can change the digit of option by SKIP+/-.
 You can edit 0~f by REPEAT or PLAY/PAUSE key.

5. Bluetooth DUT

 Front Key : STOP
 RCU Key : PROGRAM
 Bluetooth model only

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

 Front Key : STOP
 RCU Key : EQ

7. Amp Clip On/Off

 Front Key : STOP
 RCU Key : Mute

Amp Clip Mode Change (Amp Clip On --> Amp Clip Off --> Level Down display).

8. Demo ALL Key Lock (CM9520/CM8520 Only)

 Front Key : STOP
 RCU Key : 9

Demo All Key Lock Change (All Key Lock On --> All Key Lock Off).

- Working on Demo Operation only.

- When All Key Lock, Volume Key work only.

- After All Key Lock Off, it can unlock Demo Mode.

1-6

SERVICE INFORMATION FOR EEPROM

POWER ON

FLD no disc status or AUX status.

Remote control ‘Fwd skip’ + Front ‘STOP’

push same timing during 5 seconds.

FLD ‘OP-0….

Move to appropriate position and

make changes with remote control

‘skip, mode, play’ key.

Press ENTER key

FLD ‘write ok’

DETECT NEW EEPROM
(OPTION EDIT SCREEN)

NAME

OPT0
OPT1
OPT2
OPT3
OPT4
OPT5
OPT6
OPT7
OPT8
OPT9

HEX

05
00
00
02
00
69
81
05
30
00

Remote control ‘Fwd skip’ +

Front ‘STOP’ push same timing

FLD ‘E2P CLR’

Completed

1-7

PROGRAM DOWNLOAD & UPDATE GUIDE

1. AUDIO PROGRAM

Download program file name must be CM4530_xxxxxxx.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.

Caution: When downloading the file, you should neither unplug the USB device, change to the other

function, nor power off the device. USB device must be unplugged when the downloading
process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

SEARCH

↓

FIRMWARE

↓

WRITE 00 .. 100

↓

UPDATED

↓

POWER OFF AUTOMATICALLY ← When completed, remove USB device.

1-8

2. CD PROGRAM

Download program file name must be HF000_CM4530_xxxxxxxx_xx.bin

Tip) With B/T : HF000_CM4530_xxxxxxxx_xx.bin
Without B/T : HF400_CM4530_xxxxxxxx_xx.bin

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

device and disable the security software, then download the file to your set.

Caution: When downloading the file, you should neither unplug the USB device, change to the other

function, nor power off the device. USB device must be unplugged when the downloading
process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

SEARCH

↓

FIRMWARE

↓

FINISH

↓

POWER OFF MANUALLY ← When completed, remove USB device.

1-9

3. EQ PROGRAM

Download program file name must be EQ_PRG_CM4730_xxxxxxxxx_xxxx.bin

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

device and disable the security software, then download the file to your set.

Caution: When downloading the file, you should neither unplug the USB device, change to the other

function, nor power off the device. USB device must be unplugged when the downloading
process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function.

READ

↓

EQ DOWN

↓

FINISH

↓

POWER OFF AUTOMATICALLY ← When completed, remove USB device.

1-10

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label.
Power consumption Refer to the main label.
Dimensions (W x H x D) 202 x 307 x 315 mm
Net Weight (Approx.) 3.15 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 5 % to 90 %
Bus Power Supply DC 5 V 500 mA

• INPUTS

AUX IN 2.0 Vrms (1 kHz, 0 dB), 75 Ω, RCA jack (L, R) x 1

• TUNER

FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
AM Tuning Range 522 to 1 620 kHz, 520 to 1 710 kHz or 522 to 1 710 kHz

• AMPLIFIER

Stereo mode 240 W + 240 W (3 Ω at 1 kHz, THD 10 %)
Surround mode
Front 240 W + 240 W (3 Ω at 1 kHz, THD 10 %)
Subwoofer 240 W (3 Ω at 60 Hz, THD 10 %)

• CD

Frequency Response 100 to 20 000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 80 dB

• FRONT SPEAKER

Model CMS4630F
Type 2 Way 2 Speaker
Impedance 3 Ω
Rated Input Power 240 W
Max. Input power 480 W
Net Dimensions (W x H x D) 245 x 452 x 275 mm
Net Weight 5.55 kg

• SUBWOOFER SPEAKER

Model CMS4530W
Type 1 Way 1 Speaker
Impedance 3 Ω
Rated Input Power 240 W
Max. Input power 480 W
Net Dimensions (W x H x D) 250 x 352 x 327 mm
Net Weight 5.58 kg

 Design and specifications are subject to change without notice.

1-11

MEMO

1-12

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

1. CABINET AND MAIN FRAME SECTION (CM4730) ................................................................................ 2-3

2. MECHANISM DECK SECTION (DP-12AM) ............................................................................................. 2-5

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

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

2-1

MEMO

2-2

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (CM4730)

260L

464

261

464

451

464

NOTES) THE EXCLAMATION POINT WITHIN AN

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

G

LITERATURE.

460

464

A42

A43

FRONT

464

B

CABLE2

258

F

SMPS

262

A47

276

279

464

E

A

265

464

260R

464

E

464

D

251

464

464

259

F

464

MAIN

A

B

A46

C

464

C

464

A44

H

300

273

274

2. MECHANISM DECK SECTION (DP-12AM)

MEMO

001

A02

017

013

435

015

439

018

015B

015A

014

002

003

A01

020

016

026

A03

019

440

012

442

012

010

012A

037

442

3. PACKING ACCESSORY SECTION

801 Instruction Ass'y

808 Battery

825 FM Wire Antenna

803 Packing

804 Bag

824 AM Loop Antenna

900 Remote Control

803 Packing

802 Box

4. SPEAKER SECTION

4-1. FRONT SPEAKER (CMS4630F)

A60

4-2. SUBWOOFER SPEAKER (CMS4530W)

A90

MEMO

2-10

SECTION 3

ELECTRICAL

CONTENTS

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

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

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

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

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

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

AUDIO ELECTRICAL TROUBLESHOOTING GUIDE .................................................................. 3-16

1. POWER (SMPS) ................................................................................................................................... 3-16

2. μ-COM PART CHECK .......................................................................................................................... 3-20

3. IC102(N24C16) CHECK ....................................................................................................................... 3-20

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

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

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

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

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

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

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

2. DOUBLE USB FUNCTION (OPTIONAL PART) ................................................................................... 3-28

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

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

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

1. OVERALL BLOCK DIAGRAM .............................................................................................................. 3-35

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

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

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

5. FRONT/ AMP POWER DIAGRAM ....................................................................................................... 3-43

CIRCUIT DIAGRAMS ............................................................................................................................... 3-45

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-45

2. MAIN - DSP CIRCUIT DIAGRAM ......................................................................................................... 3-47

3. MAIN - MICOM/ ADC CIRCUIT DIAGRAM .......................................................................................... 3-49

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

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

6. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-55

CIRCUIT VOLTAGE CHART ................................................................................................................. 3-57

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

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

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

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

3-1

ONE POINT REPAIR GUIDE

1. NO POWER

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

1-1. FUSE & BRIDGE DIODE

1-1-1. Solution

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

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

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

2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.

3) Check if the NTC thermistor TH901 is normal or open.

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

< F901 >

If F901 is not short-circuit,

replace it with a same

specifi cations one.

replace it with a new one.

< BD901 >

If BD901 is short-circuit,

< TH901 >

If TH901 is open,

replace it with a new one.

3-2

ONE POINT REPAIR GUIDE

NO POWER

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

1-2. D929

1-2-1. Solution

Please check and replace D929 on SMPS board.

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

1) Check the Anode-Cathod Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.
 If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.

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

< SMPS schematic diagram >

3-3

ONE POINT REPAIR GUIDE

2. NO BOOTING WHEN POWER ON THE SET

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

2-1. FLASH MEMORY

2-1-1. Solution

Please check and replace IC102 on MAIN board.

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

1) Check 3.7 V to CN101 and CN105 in standby mode.
 If there is no 3.7 V, check the SMPS.

2) Check 5.6 V, 12 V, F+, F- and PVDD when power on the set.

- If the set doesn’t work regardless of what the KEY1 changes high to low while pressing the power button
X100 and X101 work normally but, if you can not power on the set, replace IC101 with a new one on
the MAIN board.

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

.

KEY1(R152)

IC101

< Signal check point >

PWR˻CTRK(R119)

3-4

ONE POINT REPAIR GUIDE

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET

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

3-1. VFD

3-1-1. Solution

Please check and replace DIG502 on FRONT board.

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

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

2) Check if IC102 outputs VFD_D0, VFD_CLK and VFD_STB to the FRONT board.

3) Check the GR signal(pulse signal) of IC501 on the FRONT board.
Check the SG signal(pulse signal) of IC501 on the FRONT board.

 If the GR and SG signal isn’t output, replace IC501 with a new one.
 If the GR and SG signal is output, replace DIG502 with a new one.

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

nyG

znG

GR SIGNAL
ABOUT 30V

SG SIGNAL
ABOUT 30V

3-5

< Waveform of GR and SG signal >

ONE POINT REPAIR GUIDE

4. NO OPERATION OF MD

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

4-1. SPINDLE MOTOR

4-1-1. Solution

Please check and replace IC301, IC302 on MAIN board.

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

1) Check the SPDO signal from pin16 of IC302.
 If no signal, check 3.3 V(RF) and X301.

2) Check the SPIN- & SPIN+ from IC301 to CN303 for driving SPINDLE motor. It is about 3.6 Vp-p.
 If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN303 and MD.

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

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

About 3.6Vpp

< Waveform of SP- & SP+

for driving SPINDLE motor >

Sp-

Pin18 to CN303

IC301

Sp+

Pin17 to CN303

< Signal check point >

3-6

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

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

4-2. SLED MOTOR

4-2-1. Solution

Please check and replace IC301, IC302 on MAIN board.

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

1) Check the SLDO signal from Pin15 of IC302.
 If no signal, check 3.3 V(RF) and X301.

2) Check the SLED+ & SLED- from IC301 to CN303 for driving SPINDLE motor. It is about 2.9 Vp-p.
 If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN303 and MD.

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

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

hG
YU`} T

zsTGjuZWZ

zwT G ju[W\

zsRGGjuZWZ

zwRGGju[W\

< Waveform of SLED- & SLED+

for driving SLED motor >

zsT

XYGGjuZWZ

pjZWX

zsGR

XXGGjuZWZ

< Signal check point >

3-7

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

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

4-3. TRAY OPEN / CLOSE MOTOR

4-3-1. Solution

Please check and replace IC301, IC302 on MAIN board.

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

1) Check MOT_OPEN & MOT_CLOSE signals from Pin104, 105 of IC801 to IC301.
 If no signal, check +1.8 V & + 5 V to IC301.

2) Check LOAD± from IC301 to CN303 for driving the tray open / close motor. It is about 3.85 Vp-p.
 If no signal, check +5 V to IC301. If it has any trouble, replace it with a new one.

3) Check if the FFC cable is solidly connected between CN303 and MD.

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

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

< Waveform

for driving TRAY open / close motor >

< Signal check point >

3-8

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

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

4-4. LASER TRACKING ACTUATOR

4-4-1. Solution

Please check and replace IC301, IC302 on MAIN board.

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

The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.

1) Check the TRD signal from Pin14 of IC302.
 If no signal, check 3.3 V(RF) and X301.

2) Check TR- & TR+ from IC301 to CN301 for driving the tracking actuator.
 If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN301 and MD.

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

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

< Waveform of TR±

for driving TRACKING actuator >

X]G GjuZWX

{R

pjZWX

{T

X\GGjuZWX

< Signal check point >

3-9

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

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

4-5. LASER FOCUSING ACTUATOR

4-5-1. Solution

Please check and replace IC301, IC302 on MAIN board.

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

The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.

1) Check the FOD signal from Pin13 of IC302.
 If no signal, check 3.3 V(RF) and X301.

2) Check F- & F+ from IC301 to CN301 for driving the focusing actuator.
 If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN301 and MD.

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

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

< Waveform of TR±

for driving FOCUSING actuator >

X[G GjuZWX

mR

pjZWX

mT

XZGGjuZWX

< Signal check point >

3-10

ONE POINT REPAIR GUIDE

5. NO SOUND

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

5-1. IN THE CD FUNCTION

5-1-1. Solution

Please check and replace IC601, IC801 on MAIN board.

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

1) Check CD_BCLK, CD_LRCK, & CD_DOUTA signals from IC302 to IC801.
 If no signal, check if the RF & servo signals from MD is entered to IC302.
Refer to the “No operation of MD” guide on Item 4.

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

- DAC_BCK : IC801_Pin85 --> IC601_Pin23

- DAC_LRCK : IC801_Pin86 --> IC601_Pin22 (44.1 kHz)

- DAC_DATA : IC801_Pin81 --> IC601_Pin24

- DAC_MCLK : IC801_Pin84 --> IC401_Pin44
 If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.

3) Check if “Digital audio AMP block” on Item 5-2 is normal.

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

P/UP

BU9543KV

M

12.288MHZ

PWM

TAS5548

74AHC244

FR,FL

Woof er

< I2S Signal Flow >

TAS5612LA

TAS5612LA

BX8805

(128
PIN)

150Wx2

200Wx1

khjtjsrGOX]U`Zto¡P
khjijrGOXU[to¡ P
khjkh{h
khjsyjrGO[[UXro¡ P

< Waveform of I2S audio interface signals >

3-11

ONE POINT REPAIR GUIDE

NO SOUND

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

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

5-2-1. Solution

Please check and replace IC701, IC702 on MAIN board.

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

1) Check FL±, FR± & SW± signals from IC601 to IC701 & 702 each input function.
 If no signal, check if I2S audio signals are entered to IC601.
Refer to “I2S audio signal interface” on Item 5-1.

2) Check PVDD.
 If PVDD is abnormal, check the SMPS.

3) Check +12 V for driving the gate of AMP IC.
a. All the powers are normal, but if +12 V is low, there is possible for AMP IC to be damaged.
b. Remove L707, L708, L709 and L712 one by one.
When removed a inductance, if +12 V is recovered, the IC connected to it was damaged.
c. Replace the IC with a new one.

4) Check the impedance between IC701/IC702_OUT-A/OUT-B & GND.
a. If the impedance is 0 Ω, the IC must be damaged.
b. After removing the heat sink, replace it with a new one.

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

mySG ms

pj^WX

 

pj^WY

z~

jt[\YW

< Signal check point >

3-12

ONE POINT REPAIR GUIDE

NO SOUND

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

5-3. IN THE USB FUNCTION

5-3-1. Solution

Please check and replace IC801 on MAIN board & IC502 on USB board.

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

1) Check +5VU to USB board.
 If the USB LED are turned on, the voltage is okay, if so not, check +5.6 V to pin6 of CN502.

2) Check USB D± from MAIN board to USB board.
a. Check USB_DM/DP signals to IC801(pin117, 118).
b. Check USB± signals to CN502 (pin1, 2, 4, 5).
 If there is any trouble, check the power for each IC. The power is normal but , if the signal waveform to
the IC is distorted or no signal, replace it with a new one.

3) Check if “Digital audio AMP block” on item 5-2 is normal.

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

BX8805

(128
PIN)

USB HUB
USB2512

IC601

TAS5548

PWM

USB1

FL·

FR ·

SW

IC701

AMP IC

TAS5612LA

IC702

AMP IC

TAS5612LA

< USB function signal fl ow >

F/L

F/R

150Wx2

SW

200Wx1

kT GXM[GGjuXWY

kRGGGY M\GjuXWY

< Waveform of USB D± signal >

3-13

ONE POINT REPAIR GUIDE

NO SOUND

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

5-4. IN THE AUX FUNCTION

5-4-1. Solution

Please check and replace IC401 on MAIN board.

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

1) Check AUX_L/R signals to IC401 (Pin7, 8).

2) Check if DAC_BCK, DAC_LRCK, & DAC_MCLK are entered from IC801 to IC401.

3) Check if ADC_DATA is entered from IC401 to IC801.
 If no signal, check +5 V & +3.3 V(ADC) for IC401. If is NG, replace it a new one.

4) Check the following I2S signal flow from IC801 to IC602. (Refer to Item 5-1.)
 If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 5-2.
 If AMP is damaged, replace it with a new one.

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

74HCT244

BX8805

(128
PIN)

SW

FL·

FR ·

AUX_L /R

TAS5612LA

TAS5612LA

IC701

AMP IC

IC702

AMP IC

AUX

IC401

CS5346

IC601

TAS5548

PWM

< AUX function signal fl ow >

F/L

F/R

150Wx2

SW

200Wx1

ADC˻DATA TO R409

AUX˻R TO R424

IC401

AUX˻L TO R4 24

DAC˻BCK TO 408

DAC˻LRCK TO R407

DAC˻MCLK TO R406

3-14

< Signal check point >

ONE POINT REPAIR GUIDE

NO SOUND

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

5-5. IN THE TUNER FUNCTION

5-5-1. Solution

Please check and replace IC401, TU100 on MAIN board.

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

1) Check if TUNER_LR is entered from Pin1,3 of TU100 to IC401(Pin23, 24).

 If no signals, Check +3.3 V for Tuner power.
 Check if the Tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC102 to TU100.

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

2) Check if DAC_BCK, DAC_LRCK, & DAC_MCLK are entered from IC501 to IC401.

3) Check if ADC_DATA is entered from IC401 to IC801.
 If no signal, check +5 V & +3.3 V(ADC) for IC401. If is NG, replace it with a new one.

4) Check the following I2S audio signal flow from IC801 to IC601. (Refer to Item 5-1.)
 If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 5-2.
 If AMP is damaged, replace it with a new one.

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

TUNER_ L/R

74HCT244

BX8805

(128
PIN)

IC401

CS5346

IC601

TAS5548

PWM

FL·

FR ·

SW

< TUNER IN function signal fl ow >

TUNER

A

IC701

AMP IC

TAS5612LA

IC702

AMP IC

TAS5612LA

F/L

F/R

SW

200Wx1

IC401

TUN ER˻L TO R 114

TUN ER˻R TO R113

< Signal check point >

3-15

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

1. POWER (SMPS)

No 3.7 VA

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

BD901 normal? Replace BD901.

TH901 normal? Replace TH901.

YES

NO

YES

NO

YES

NO

YES

Is Vcc

(10 V ~ 18 V) supplied to

IC901 Pin7?

YES

D922 normal? Replace D922.

YES

Is there

about 2.5 V at

NO

NO

NO

D904 normal?

Check or replace D904.

Replace IC903.

IC903 Pin1?

YES

D923 normal? Replace D923.

YES

D921 normal? Replace D921.

NO

NO

NO

YES

D924 normal? Replace D924.

YES

D925 normal? Replace D925.

YES

Power line of Main PCB is short.

NO

NO

3-16

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No PVDD

YES

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

YES

BD901 normal? Replace BD901.

YES

TH901(TH902) normal? Replace TH901.

NO

NO

NO

Is Vcc

(10 V ~ 18 V) supplied to

IC902 Pin7?

YES

NO

D905 normal?

YES

Q910 base "H"?

YES

•

Check P-CTRL "H" signal from μ-COM.

• Check PC902.

Check or replace Q910.

Q902 normal? Replace Q902.

YES

D929 normal? Replace D929.

NO

NO

NO

Check or replace D905.

NO

YES

Is there about 2.5 V

at IC904 Pin1?

YES

Power line of Main PCB is short.

NO

Replace IC904.

3-17

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No 12 V

YES

Is Vcc

(15 V) supplied to Q953

collector?

YES

Is the

13 V Supplied to Q953

base?

YES

Check or replace Q953.

No 5 V

YES

Is Vcc

(6 V) supplied to IC951

Pin1?

NO

NO

NO

Check or replace D921.

Check P-CTRL “H” signal

from μ-COM.

Check or replace D923.

YES

Check

IC951 Pin4 "H".

YES

Check or replace IC951.

NO

3-18

Check P-CTRL

“H”’ signal from μ-COM.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No VFD

YES

D925 normal?

YES

ZD951 normal?

YES

Q951 normal?

YES

Check or replace VFD.

NO

NO

NO

Check or replace D925.

Check or replace ZD951.

Check or replace Q951.

3-19

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

2. μ-COM PART CHECK

μ-COM PART

CHECK

YES

Check if

voltage of CN105 Pin10

is 3.7 VA.

YES

Check

both end voltage of

D102, D103.

YES

Check if IC101_Pin49 and

IC101_Pin36,59 are 3.7 V.

YES

X101: 32.768 kHz

X102: 9.8304 MHz

Check the operation.

YES

OK

NO

NO

Refer to

SMPS troubleshooting.

Check if output of

D103 is 3.7 V.

Check D102, D103.

YES

OK

NONO

Replace D102, D103.

3. IC102(N24C16) CHECK

CHECK IC102 PIN.

YES

Pin47: DATA

Pin48: CLK.

YES

OK OK

NO

Check μ-COM

voltage 3.7 VA.

YES

Check μ-COM.

YES

3-20

NO

Refer to μ-COM troubleshooting.

NO

Replace μ-COM.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

4. FLD DISPLAY CHECK

FLD DISPLAY CHECK

YES

Check

CN105 Pin1,2,3 input

voltage.

YES

Check if both end voltage

of FL+, FL- are over 2.9 V

VKK : over 25.6 V.

YES

Check CN501

connection and power

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

Pin10(3.7 VA).

YES

Check

IC501(ET16315) voltage

Pin30 VKK: -25.8 V

Pin13, 43: 3.4 V.

NO

Refer to SMPS troubleshooting.

NO

Check CN501 connection.

YES

Check each
Pin voltage.

YES

OK

NO

If voltage is not 3.4 VA, check input

and output of D502 and D503.

YES

YES

Check

IC102->IC501

data communication

Pin3->Pin9 STB
Pin2->Pin7 DATA
Pin4->Pin8 CLK

YES

FLD light on?

YES

OK

Check IC501.

YES

OK

NO

Check output data IC102 Pin2.

Check input data

IC102 Pin2,3,4.

YES

YES

Check IC102.

YES

OK

3-21

NO

Replace IC501.

NO

Replace IC102.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

5. PWM MODULATION CHECK

PWM MODULATION PART CHECK

YES

Check

CN105 Pin11 3.7 VA.

YES

• Check IC601(TAS5548)
VDD 3.3 V

• Check VDD Core 1.2 V.

YES

Check

X602(19.2 MHz)

operation.

YES

Check

IC601 Pin21 input.

NO

NO

Refer to

SMPS troubleshooting.

Check X602

(19.2 MHz).

YES

OK

NO

Replace X602(19.2 MHz).

YES

Check IC101

(LC87FC096AVU)

Pin41:PWM RESET

Pin45:PWM SDA

Pin46:PWM SCL

output.

YES

A

NO

Check line

resistor output

RST: R660 / SCL: R659 /

SDA: R658.

YES

OK

3-22

NO

Replace R660,R659,R658.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

A

YES

Check

IC601(PS9854)

input data

Pin4, 5, 6

PWM wave.

YES

Check

PWM

modulator output
FL: Pin26(-),27(+)
FR: Pin28(-),29(+)

and others.

NO

NO

Check

CD Assy communication

Pin4, 5, 6.

YES

Check

IC601(PS9854) input

data.

YES

OK

Check

IC601(PS9854).

YES

NO

NO

NO

Refer to

CD troubleshooting.

Check each line

resistor output.

Replace

IC601(PS9854).

OK

YES

OK

3-23

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

6. POWER AMP PART CHECK

POWER AMP PART CHECK

YES

Check

CN105 Pin6: +12 V

Pin14,15: 26 V.

YES

Check IC701, IC702

Pin29, 30, 31, 36, 37, 38 input voltage.

YES

Check IC701, IC702

Pin2: +12 V input.

YES

Check PWM Modulator input

IC701 Pin5, 6, 14, 15 / IC702 Pin5, 6.

YES

Check IC701, IC702

Pin27, 28, 32, 35, 39, 40.

NO

Refer to SMPS troubleshooting.

NO

Check each line resistor output voltage.

YES

Check output

line coil.

YES

OK

NO

Replace the coil.

3-24

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

7. TUNER / AUX FUNCTION CHECK

FUNCTION CHECK

YES

Check IC401

(CS5346) Pin7, 8,

23, 24 input.

YES

Check IC401

(CS5346) Pin9 output

data.

YES

Check

IC801(BX8805)

input data.

YES

IC501(MLC9800)

output data.

NO

Check JK401,TU100.

Check IC401

Pin5: +5 V

Pin46: +3.3 V.

YES

Check IC401

Pin5: +5 V,

Pin6: High,

Pin46: 3.3 V.

NONO

NONO

Check CN105 Pin7: +5 V

Pin9, 10: +3.3 V.

Check IC401
Pin41: SDOUT,
Pin42: SLCK,
Pin43: LRCK,
Pin44: MCLK.

YES

Replace IC401.

OK

YES

3-25

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

8. TUNER FUNCTION CHECK

TUNER FUNCTION CHECK

YES

Check tuner

module(TU100)

operation.

YES

Check IC102 Pin21, 22, 23, 24, 25

data in/output.

YES

Refer to function check.

NO

NO

Check tuner module voltage

(Pin4: +3.3 V).

Check tuner module data.

3-26

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

1. CD FUNCTION

CD FUNCTION

YES

Can the

disc insert?

YES

Disc reading

is ok?

YES

Is no signal at spk?

YES

Check

the signal of

IC302 Pin34,35,36.

NO

Is load +,- ok?

Is Motor ok?
(about 12 Ω)

NO

IM driving (Focus and

tracking) is ok?

NO

Check Vcc of IC302.

YES

NO

NO

NO

Is Motor_open/close

OK? (IC301 Pin10,11)

Check IC301.

Check loading motor.

tracking/sled signal

Is the PD(CN301

Pin22) about 190 mV?

YES

Focus/

is ok?

YES

NO

NO

Check IC301

(Motor drive IC).

Check IM
(pick-up).

YES

Check

the signal (16.0344 MHz)

of IC302

Pin31.

YES

Check IC801

input/output and

control line.

YES

Refer to function

check.

NO

NO

Check Cristal (X301).

Replace IC801.

NO

3-27

Replace Cristal

(X301).

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

2. DOUBLE USB FUNCTION (OPTIONAL PART)

USB FUNCTION

YES

Plug-in usb device.

YES

Display “NO USB”.

YES

Display “READ”.

YES

Display “NO FILE”.

YES

Check usb audio fi le in usb device

(MP3, WMA fi le is playable)

Check USB_5V.

YES

Check USB_D+/D-

(R501,R502).

YES

Check IC801(Pin116, 117).

NONO

Check CN502.

NO

Check usb jack (JK501/ JK502).

NO

Replace IC801.

3-28

1. SDRAM

WAVEFORMS OF MAJOR CHECK POINT

2. SERVO

CLK

1

DATA

2

ADDRESS

3

CS

4

IC802 Pin38

IC802 Pin53

IC802 Pin35

IC803 Pin1

5

IC801 Pin62

CD-16M

3-29

6

IC302 Pin61

TE

FE

7

IC302 Pin62

FOD

8

IC302 Pin13

RF

9

3. AUDIO PATH

10

CD_BCK

IC302 Pin63

IC801 Pin101

11

12

3-30

CD_LRCK

CD_DATA

IC801 Pin103

IC801 Pin102

13

14

DAC_MCLK

IC801 Pin84

DAC_BCK

IC801 Pin85

4. USB

15

16

USB_5V

DAC_LRCK

DAC_DATA

IC801 Pin86

IC801 Pin81

17

18

D+

D-

IC801 Pin117

IC801 Pin118

3-31

MEMO

3-32

WIRING DIAGRAM

Power

cord

15P

SPK TERMINAL

1CD MD

23P9P

AUX

JACK

MODULE

TUNER

SMPS PCB

8P

8P

BT

MAIN PCB

16P

: Harness

FRONT PCB

: FFC

3-33 3-34

BLOCK DIAGRAMS

1. OVERALL BLOCK DIAGRAM

244_CTRL1/244_CTRL2

VFD

TUNER

P/UP

M

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

REMOCON/KEY/

IC501

ABOV

TUNER_RST/CE/DAT/CLK

TUNER_L /R

m·V{y·

SLEDs

SPINs

LOADs

A,B,C,D,E,F

PD

LD

EEPROM

A

BU9543KV

IC102

VFD_STB/CL K/DO

B

OP_SW,CL_SW

LD

IC301

S3053

Motor
Drive

SPDO/SLDO/FOD/TRD /

IC302

CLK/DATA

LC87Fxx96A

ADC_RST/CLK/DAT

SPEANA

SPI: MICOM_ CS/D O/ DI /CLK
MAIN_RESET

MOT_MUTE/CLOSE/OPEN

CD_16M

CD_MCK/RW/DIN_ OUT /BU SY

9543_Reset

I2S

74HCT244

IC101

MICOM

PWM_RST

PWM DAT/CL K

PWM_MUTE

DAC_DATA

DAC BCK/L RCK

IC801

BX8805

AMP_OTW/SD/CL IP/AMP PROTECT

AMP_PDN

FL·

FR ·

IC601

TAS5548

PWM

SW

Optional

CM4330 Single USB
CM4430/4530/4630 Dual USB

USB_HUB_Ds

USB_HUB_Res

et

BT_RESET/BT_RTS/BT_CTS/
BT_RX/BT_TX

DRM_SEL/DRM_CKE/DRM_RAS
DRM_CLK/DRM_CAS/DRM_WE N

D0~D15/A0~A11/A13~A16

IC701

AMP IC

F/L

F/R

TAS5612LA

IC702

AMP IC

SW

TAS5612LA

USB HUB

USB2512

IC504
CP for

IPOD

MB0402C1

BT Ver. 2.0.1

8MB

IC802 SDRAM

M12L64164A-7TG2M

150Wx2

200Wx1

USB2

USB1

TUNER

AUX

ADC_RST/CLK/DAT

B

A

TUNER_L /R

AUX_ L/R

IC401

CS5346

I2S

244_CTRL1/244_CTRL2

SF_DI/DO

SF_CS/CLK(SPI)

IC803 FLASH

W25Q80BVSSIG

1MB

3-35 3-36

2. SMPS BLOCK DIAGRAM

SMPS

م

ࣧ

م

م

م

م

Snubber

Block

SMPS IC

م

Main

Block

T
R
A
N
S

م

5V LDO

12V

Regulation

Block

On/Off

م

On/Off

FL+

FL-

Vkk

5V

5.6VA

12V

3.7VA

CN901

Noise

Filter

Block

(X-cap

Line Filter)

F

U

S
E

Y-Cap

Y-Cap

م

Snubber

م

AMP

SMPS IC

With FET

Block

Block

م

On/Off

Photo coupler

Photo coupler

T
R
A
N
S

Feedback

Photo coupler

Feedback

م

م

م

P. C TL

PVDD

3-37 3-38

3. AUDIO PATH BLOCK DIAGRAM

Tuner

Aux in

A_TUNER

A_AUX

ADC

CS5346

(SLAVE)

ADC_DATA

DAC_MCLK

DAC_LRCK

DAC_BCK

BCK

LRCK

DAC_LRCK

DAC_BCK

DAC_DATA

12.288MHZ

PWM

TAS5548

FR,FL

Woofer

Optional

TAS5612LA

TAS5612LA

AMP Block

150Wx2

200Wx1

BU9543KV

74AHC244

CD_BCK

CD_LRCK

CD_DATA

244_CTRL1/CTRL2
(From MICOM)

DATA

BX8805

(128 PIN)

MAIN

Block

12MHZ

3-39 3-40

4. MAIN POWER DIAGRAM

+3.7VA

P_CTRL

VCC33

TJ3965D

KIA7027AF

LM1117-1.2V

RESET

PWR_SENSE

VDD

3.3V

VCC33

VCC15

VCC33

VCC12

VCC33

VCC33

MICOM

EEPROM

BU9543KV

BX8805

TAS5548

BT module

5VA

VCC33

VCC33

VCC33

VCC33

VCC33

VCC33

5V

VCC18

5V

SDRAM

FLASH

TUNER

PICKUP

74HCT244

CS5346

S3053

ADD

3-41 3-42

5. FRONT/ AMP POWER DIAGRAM

Optional Part

FROM_MAIN to Front

12V

+3.7VA

VKK/FL-+

LED

RCU

MC3401

VFD

5.6VA

FROM_SMPS to AMP

12V

PVDD

LM37102-ADJ

3-43 3-44

USB_5V

USB_5V

USB1

USB2

FAN

TAS5612LA

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

12

11

10

9

8

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(

2. Voltages are DC-measured with a digital voltmeter

) parts are critical for safety.

Replace only with specified part number.

during Play mode.

7

6

5

4

3

2

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

1

Replace only with the type identical to fuse rating

and(or) model name described in main label.

A

CAUTION:

Danger if fuse is incorrectly replaced.

EAX65135601_0.1.0_SMPS_SD

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

SMPS

2013. 02. 04

3-45 3-46

2. MAIN - DSP CIRCUIT DIAGRAM

12

11

10

9

5

2

4

1

16

8

13

3

14

15

7

6

5

10

4

18

17

11 12

3

2

1

: WAVEFORM NUMBER

A

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

EAX64991602_0.1.0_Main_SD_1

DSP

2013.02.04

3-47 3-48

3. MAIN - MICOM/ ADC CIRCUIT DIAGRAM

12

11

10

9

8

7

6

5

4

3

2

1

EAX64991602_0.1.0_Main_SD_2

A

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

MICOM & ADC

2013.02.04

3-49 3-50

4. MAIN - AMP CIRCUIT DIAGRAM

12

11

10

9

8

7

6

5

4

3

2

1

EAX64991602_0.1.0_Main_SD_3

A

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

AMP

2013.02.04

3-51 3-52

5. MAIN - RF SERVO CIRCUIT DIAGRAM

12

9 7 6

11

10

9

8

7

6

5

4

3

8

2

1

: WAVEFORM NUMBER

A

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

EAX64991602_0.1.0_Main_SD_4

RF SERVO

2013.02.04

3-53 3-54

6. FRONT CIRCUIT DIAGRAM

12

11

10

9

8

7

6

5

4

3

2

1

EAX64991401_0.1.0_FRONT_SD

A

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

FRONT

2013.01.08

3-55 3-56

CIRCUIT VOLTAGE CHART

SMPS Input LDO TYPE Used-current(mA) Total-current Real Input(V) LDO Used-power(W) Total-power(W) Item

3.7VA / / 10.5 10.5 3.7 / / STBY-LED

3.7VA Diode MBR0540 4

3.7VA Diode MBR0540 5 3.3 0.002 MICOM & EEPROM

3.7VA

3.7VA 8.2 3.3 0.003 Flash

3.7VA

3.3V

5VA

5.6VA 5.6V LDO 0IPMGKE018A 72/80 5

Vkk 26V / / 2 2 26 / / MC3401

F+ 20.2V / / 140 140 20.2 / / VFD

12V

PVDD

3.7VA 13 3.3 0.005 BU9543KV

3.7VA 22 3.3 0.009 TUNER

3.7VA 92 3.3 0.037 TAS5548

3.7VA 1 3.3 / 74HCT244

3.7VA 3.5 3.3 0.001 Pick Up

3.7VA 7.8 3.3 0.003 CS5346

3.7VA 15 3.3 0.006

3.3V LDO LM1117_1.2V 52 52 1.2 0.109 0.109

3.3V Diode& Triode 6 6 1.5 0.011 0.011 BU9543KV

5V / / 36 36 5 V / CS5346

5V / /

12V / / 88

12V / / 90 12 / / FAN

12V / / 110 12 / / TAS5612LA

26/29.1V / /

26/29.1V / / 6000 Peak6A 26/29.1 / / TAS5612LA

LDO TJ3965D-ADJ

16

Normal : 110

Peak400

3000

(2 CH)

9

178.5

288

Peak3A 26/29.1 / / TAS5612LA

3.3 0.002

3.3 0.006

5 / / S3053

0.043 0.043

/0.048 /0.048

12 / / 8 Blue LED

0

0.071

MC3401

SDRAM

BX8805

USB

SMPS

Output Voltage Current (mA) Remark

3.7V

5V

12V

PVDD 2 CH 3000 Max

Reading 262

Max 280

Reading 410

Operation (Normal) 180

VOL < 20 180 Fan : not Work.

VOL > 20 250 Fan : Work.

3-57 3-58

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD

(TOP VIEW)

(BOTTOM VIEW)

NOTE) Warning

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

3-59 3-60

2. MAIN P.C.BOARD

(TOP VIEW)

(BOTTOM VIEW)

3-61 3-62

3. FRONT P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

3-63 3-64