LG MDS262V Schematic

KARAOKE MINI
HOME THEATER

SERVICE MANUAL

MODEL : MDD262(MDS262V)

CAUTION

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

.

MODEL : MDD262(MDS262V)

SERVICE MANUAL

P/NO : AFN32840846 FEBRUARY, 2007

http://biz.lgservice.com

1-1

CONTENTS

SECTION 1
GENERAL

SERVICING PRECAUTIONS ......................................1-2

• NOTES REGARDING HANDLING OF THE PICK-UP

•

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

ESD PRECAUTIONS ...................................................1-4

LOCATION OF USERS CONTROLS.........................1-5

SPECIFICATIONS ........................................................1-7

SECTION 2
EXPLODED VIEWS

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

TAPE DECK MECHANISM EXPLODED VIEW ........2-3

1. TAPE DECK MECHANISM

(A/R & A/S : RIGHT A/R DECK)........................2-3

2. TAPE DECK MECHANISM

(A/R & A/S : LEFT A/S DECK) ..........................2-5

DVD MECHANISM EXPLODED VIEW ......................2-7

SPEAKER EXPLODED VIEW ....................................2-9

MODEL : MDS262V (FRONT SPEAKERS)...........2-9

PACKING ACCESSORY VIEW.................................2-13

SECTION 3
AUDIO PART ELECTRICAL

AUDIO ELECTRICAL

TROUBLESHOOTING GUIDE....................................3-1

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

2. P-SENS...............................................................3-2

3. VKK CHECK.......................................................3-2

4. MICOM PART CHECK I ....................................3-2

5. MICOM PART CHECK II ...................................3-3

6. IC103(KS4CD21CS) CHECK............................3-4

7. FLD DISPLAY CHECK ......................................3-5

8. PWM MODULATION PART CHECK................3-6

9. POWER AMP PART CHECK............................3-7

10. AUX FUNCTION CHECK..................................3-8

11. TUNER FUNCTION CHECK.............................3-9

12. TAPE FUNCTION CHECK ..............................3-10

13. TAPE PLAY PART CHECK..............................3-11

14. TAPE REC PART CHECK...............................3-12

INTERNAL BLOCK DIAGRAM OF ICs...................3-13

1. ES6838 ..............................................................3-13

2. HA12237F..........................................................3-14

3. PS9829B............................................................3-15

4. PT6324...............................................................3-15

5. STR-S6757IF1905 ............................................3-16

6. TAS5142.............................................................3-17

7. U1739EJ2V1UD00/KF2_E ...............................3-18

WIRING DIAGRAM ....................................................3-20

BLOCK DIAGRAM.....................................................3-22

1. SMPS BLOCK DIAGRAM...............................3-22

2. MAIN & FRONT BLOCK DIAGRAM ..............3-24

SCHEMATIC DIAGRAMS .........................................3-26

1. SMPS SCHEMATIC DIAGRAM.......................3-26

2. MAIN SCHEMATIC DIAGRAM ........................3-28

3. AMP SCHEMATIC DIAGRAM..........................3-30

4. DECK SCHEMATIC DIAGRAM .......................3-32

5. FRONT SCHEMATIC DIAGRAM.....................3-34

PRINTED CIRCUIT DIAGRAMS...............................3-36

1. MAIN P.C.BOARD ............................................3-36

2. SMPS P.C.BOARD ..........................................3-40

3. FRONT P.C.BOARD ........................................3-42

SECTION 4
DVD PART ELECTRICAL

DVD ELECTRICAL

TROUBLESHOOTING GUIDE....................................4-1

1. POWER CHECK GUIDE...................................4-1

2. TEST & DEBUG FLOW.....................................4-2

3. USB PART ..........................................................4-7

WAVEFORMS ...............................................................4-8

1. WHEN POWER ON,

RESET & DATA ETC WAVEFORM ...................4-8

2.

OPEN / CLOSE WAVEFORM AT POWER ON

.......4-9

3.

STARTING ACTION WAVEFORM IN MD DEVICE

......4-9

4. FOCUS WAVEFORM (AT CD).........................4-10

5. FOCUS WAVEFORM (AT DVD)......................4-10

6.

AT POWER ON, SPINDLE SIGNAL AT MD DECK

........4-11

7.

AT FIRST ACTION, FOCUS SIGNAL A, B, C, D

....4-11

8. TRACKING SIGNAL..........................................4-12

9. RF WAVEFORM ................................................4-12

10. DISK TYPE JUGEMENT WAVEFORM...........4-13

SCHEMATIC DIAGRAMS .........................................4-15

1. MPEG SCHEMATIC DIAGRAM .....................4-15

2. SERVO SCHEMATIC DIAGRAM ...................4-17

3. INTERFACE SCHEMATIC DIAGRAM ...........4-19

PRINTED CIRCUIT DIAGRAM .................................4-21

DVD P.C.BOARD .................................................4-21

SECTION 5
REPLACEMENT PARTS LIST

........5-1

1-2

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.

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.

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 this.

6) Never attempt to disassemble the pick-up.
Spring by 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.

SERVICING PRECAUTIONS

SECTION 1 GENERAL

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 of 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 (1MΩ)

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.

CLEARING MALFUNCTION

You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).
Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of
the volume knob for more than 3 seconds.
If you reset your unit, you must reenter all its settings(stations, clock, timer)

NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.

2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.

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 know 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 ARROWHEAD 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 INTENED TO
ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY
INFORMATION IN SERVICE LITERATURE.

1-5

LOCATION OF USERS CONTROLS

FRONT / BACK PANEL

1

3

4

5

6
7

8

9

10

11

12

13

2

18

15

19

14

17

16

MDD262 Model

MDT352 Model

20

1. NUMERIC buttons (0-9)

2. DISPLAY WINDOW

3. • ( )POWER button

• CLOCK button

• TIMER button

• DUBBING (DUBB.) / CD SYNCHRO RECORDING
(CD SYNC.) / (ST./MO.) button

4. MULTI JOG

• MANUAL TUNING

• CD SKIP

• CLOCK ADJUST

• (b-KEY CON-#) KEY CONTROL

5. HEADPHONE Jack (PHONES): ø3.5 mm

6. USB ( ) connector

7. • FUNCTION SELECT buttons
(TUNER, TAPE, KARAOKE/DVD/CD, AUX)

• EQ button

• XTS-PRO button

• USB button

• XDSS Plus button

• Volume control knob

8. PUSH EJECT position (TAPE 1)

9. PUSH EJECT position (TAPE 2)

10.• RECORD/RECORD PAUSE ( REC/ ) button

• TUN.(-/+) buttons -AUTO TUNING /
REWIND / FAST FORWARD ( ) -TAPE/
SCAN ( ) /TEMPO (-/+) buttons -CD

• PRESET (-/+) buttons / TAPE REVERSE PLAY
() button (OPTIONAL) / TAPE FORWARD PLAY
() button

• STOP ( STOP) button

11. MIC JACKS (MIC1, MIC2): ø6.3 mm : OPTIONAL

12.MIC VOLUME knob

13.Remote control sensor

14.• OPEN/CLOSE ( OP/CL) button

• DISC SKIP (D.SKIP) button

• PLAY MODE, DEMO button

• SET/CD , RDS (OPTIONAL) button

15.DISC DOOR

16.• COMPONENT VIDEO OUT
(PROGRESSIVE SCAN) (Y Pb Pr) Connector

• VIDEO OUT Connector

17.• FM/AM ANTENNA Connector

• AUXILIARY INPUT (AUX IN) connector

18.POWER CORD

19.SPEAKER Connectors (MDT352 Model)

20.SPEAKER Connectors (MDD262 Model)

1-6

1. POWER button

2. FUNCTION SELECT buttons
(TUNER/BAND, DVD/KARAOKE, AUX, USB)

3. NUMERIC buttons (0-9)

4. TAPE FUNCTION buttons

• REVERSE PLAY ( )

• PLAY ( )

• REWIND / FAST FORWARD PLAY ( )

• TAPE 1-2 SELECT buttons (1-TAPE-2)

• RECORD / RECORD PAUSE ( / )

• TAPE STOP ( )

5. SETUP button

6. • ARROW buttons ( / )

(Selects an option in the menu)

• PRESET (-/+) buttons ( )

• TUN. (-/+) buttons ( )

7. SELECT/ENTER button

8. MENU button
(Use the MENU button to display the menu screen
included on DVD video discs.)

9. STOP ( ), PAUSE( )/ STEP, PLAY ( ) buttons

10.PROG./MEMO., REPEAT, REPEAT A-B buttons

11. EQ ,XTS-Pro, SOUND / FEMALE( ),
AUDIO / MALE( ), SUBTITLE (S-TITLE),
SHADOW, CLEAR buttons

12.ECHO VOL. ( ) buttons

13.MIC VOL. ( ) buttons

14.RDS, PTY buttons - OPTIONAL

15.XDSS plus, VSM (Virtual Sound Matrix), ZOOM,
RETURN ( ) buttons

16.• MARKER, SEARCH, MUTE( ) buttons

• TEMPO (-/+)/ SCAN ( )

• KEY CON (b/#)/ SKIP ( )

17.VOLUME -/+ buttons

18.TITLE button
(Use the TITLE button to display the title screen
included on DVD video discs.)

19.DISPLAY button

20.DIMMER button

21.SLEEP button

22.DISC SKIP (D.SKIP) button

REMOTE CONTROL

PRESET

PRESET + +

PRESET

PRESET - -

SETUP

SETUP

TEMPO

TEMPO

MENU

MENU

REPEA

REPEA

T

MARKER

MARKER

SEARCH

SEARCH

REPEA

REPEA

T A-B

A-B

PROG./MEMO.

PROG./MEMO.

ZOOM

ZOOM

EQ

EQ

AUDIO

AUDIO

S-TITLE

S-TITLE

RETURN

RETURN

RDS

RDS

PTY

PTY

CLEAR

CLEAR

TITLE

TITLE

DISPLA

DISPLA

Y

SLEEP

SLEEP

DIMMER

DIMMER

AUX

AUX

DVD/

DVD/

KARAOKE

KARAOKE

POWER

POWER

/ENTER

SELECT

MUTE

MUTE

TUNER/BAND

TUNER/BAND

USB

USB

D.SKIP

D.SKIP

STSTOP

OP

PLA

PLA

Y

PAUSE/STEP

AUSE/STEP

ECHO VOL.

ECHO VOL.

MIC VOL.

MIC VOL.

TUN. -

TUN. -

TUN. +

TUN. +

1 -

1 -

TAPE - 2

APE - 2

SHADOW

SHADOW

KEY

KEY

CON - #

CON - #

b -

b -

XTS Pro

XTS Pro

XDSS plus

XDSS plus

VSM

VSM

SOUND

SOUND

1

6

5

4

3

2

8

9

21

20

18

16

17

19

7

10

12

13

15

11

22

14

1-7

SPECIFICATIONS

• GENERAL

Power supply Refer to the main label.
Power consumption Refer to the main label.
Net Weight 8.65kg (MDT352)

5.9kg (MDD262)

External dimensions

(W x H x D)

280 X 365 X 370mm

• TUNER/AMPLIFIER

FM Tuning Range 87.5 ~ 108.0MHz or 65 ~74MHz, 87.5 ~ 108.0MHz

Intermediate Frequency 10.7MHz
Signal to Noise Ratio 60/55dB (Mono/Stereo)
Frequency Response 140 ~ 10000Hz

AM Tuning Range 522 ~ 1620kHz or 520 ~ 1720kHz

Intermediate Frequency 450kHz
Signal to Noise Ratio 30dB
Frequency Response 140 ~ 1800Hz

Output Power Front: 130W + 130W (4Ω, THD 10%)(MDD262)

100W + 100W (4Ω, THD 10%)(MDT352)

Subwoofer: 150W (3Ω, THD 10%)(MDT 352)

T.H.D 0.5%
Frequency Response 42 ~ 20000Hz
Signal-to-noise ratio 75dB

• DVD/VCD/CD PLAYER • CASSETTE TAPE PLAYER

Frequency response (audio) 40 ~ 20000Hz Tape Speed 3000 ± 3%
Signal-to-noise ratio (audio) More than 75dB (1kHz) (MTT-111.
Signal-to-noise ratio (video) More than 55dB (1kHz) NORMAL-SPEED)
Dynamic range (audio) More than 75dB Wow Flutter 0.25%
Video output 1.0V (p-p), 75Ω (MTT-111, JIS-WTD)
S-video output (Y) 1.0V (p-p), 75Ω F.F/REW. Time 120sec (C-60)

(C) 0.3V (p-p), 75Ω Frequency Response 250 ~ 8000Hz

Component Video output (Y) 1.0V (p-p), 75Ω Signal to Noise Ratio 43dB

(Pb)/(Pr) 0.7V (p-p), 75Ω Channel Separation 45dB (P/B)/45dB (R/P)

Erase Ratio 55dB (MTT-5511)

• SPEAKERS

Speaker Name Front Speaker (L/R) (MDS352V / MDS262V)
Type Bass Reflex 2Way 3Speaker
Impedance 4Ω
Frequency Response 55 ~ 20000Hz
Sound Pressure Level 82dB/W (1m)
Rated Input Power 130W
Max. Input Power 260W
Net Dimensions (W x H x D) 212 X 414 X 305mm
Net Weight 6.3kg

Speaker Name Subwoofer (MDS352W)
Type Bass Reflex 1Way 1Speaker
Impedance 3Ω
Frequency Response 50 ~ 1500Hz
Sound Pressure Level 82dB/W (1m)
Rated Input Power 180W
Max. Input Power 360W
Net Dimensions (W x H x D) 212 X 414 X 305mm
Net Weight 6.3kg

1-8

MEMO

255

256

450

450

263

262

273

455

450

H

K

A

B

E

N

N

C

F

G

J

I

A26

A40

A47

A46

266

305

267

289

456

450

264

452

458

450

450

290

290

454

450

450

A00

257

255

259

A43

A44

253

453

253

254

252

450

450

450

CABLE4

CABLE3

CABLE1

CABLE5

CN201

P9701

P9702

260

MAIN

SMPS

291

B

M

A

L

C

O

O

D

K

H

L

J

D

I

M

A41

450

CABLE2

P5701

DVD

FRONT

252

450

282

258

2-1 2-2

SECTION 2 EXPLODED VIEWS

CABINET AND MAIN FRAME SECTION

001

A00

002

037

007

006

008

016

017

018

019

020

003

009

009

A02

A01

011

013

022

025

015

023

BRASS MOTOR PULLEY MAYBE CHANGED
FOR WOW FLUTTER WHEN NECESSARY

RING FW MAYBE ADDED
FOR WOW FLUTTER WHEN NECESSARY

RING FW MAYBE ADDED
FOR WOW FLUTTER WHEN NECESSARY

2-3 2-4

TAPE DECK MECHANISM EXPLODED VIEW

1. TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK)

2-5 2-6

A00

RING FW MAYBE ADDED
FOR WOW FLUTTER WHEN NECESSARY

013

011

009

009

003

008

015

022

023

024

016

017

018

019

020

007

A03

2. TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK)

2-7 2-8

416

151

159

165

164

417

166

417

167

416

177

175

172

180

417

170

419

417

418

418

169

A30

A26

181

432

431

435

430

430

438

035

021

035A

036

430

012A

012A

012A

439

025

024

030

156

155

153

173

169A

169B

169C

168

163

162

441

440

422

DVD MECHANISM EXPLODED VIEW

A80A

A80R

A80L

A80BR

A80BL

WIRE80

WIRE81

850

855

856

857

858

860

861

863

859

851

853

852

854

862

2-9 2-10

SPEAKER EXPLODED VIEW

MODEL : MDS262V (FRONT SPEAKERS)

2-11 2-12

MEMO MEMO

2-13

PACKING ACCESSORY VIEW

3-1

AUDIO ELECTRICAL TROUBLESHOOTING GUIDE

SECTION 3 AUDIO PART ELECTRICAL

1. POWER (SMPS)

POWER (SMPS)

OK

YES

YES

YES

Replace IC 901,902

Check IC901, 902

Check the fuse

F901

NONO

NO

YES

Check short of

P9701, P9702 line

Replace the fuse

Check

the DC V of C905.

If DC V is over

400V

NO

Check BD901, LF901, 902

Check the

DC V of C981, C945.

If DC V is 6.1V

NO

Check short of P9702 line

YES

YES

Chcek the

DC V of C950, C951

If DC V is in

35.5V

NO

Check short of P9701 line

Chcek the

DC V of C909, C903,

C921 If DC V is in 14~19V

and it is steady.

YES

3-2

2. P-SENS

P-SENS

YES

YES

Check

the PIN6 of P9702

If DC V is over 5.6V

Check power circuit Trouble shooting

NO

OK

3. VKK CHECK

VKK check

YES

YES

Check

the PIN3 of P9702

If DC V is over -28V ±2

Check power circuit Trouble shooting

NO

OK

4. MICOM PART CHECK I

MICOM part check I

OK OK

YES

YES

Check P-SENS

(P7904)_PIN6.

NO

Refer to

SMPS troubleshooting.

YES

YES

YES

Check both

end voltage of IC101

(KIA7042).

Check

if input voltage of

IC101(KIA7042) is

over 5V.

YES

NO

Check the

periphery of IC101

(KIA7042).

NO

YES

Check if IC101(KIA7042) of

output voltage is over 4.3V.

Check voltage of IC100

78KO/KF2_PIN1.

NO

Replace IC101

(KIA7042).

3-3

5. MICOM PART CHECK II

MICOM part check II

X101 : 32.768kHz

X100 : 9.8304MHz

Check the operation.

Check

Q101_ emitter/collector

5V.

Check Q102_base

0.6V HIGH.

Check if IC103_PIN8 and

IC100_PIN19, 20, 59 are 5V.

NO NO

YES

YES

Check if

voltage of P7904_PIN5

is 5.6V.

NO

Refer to

SMPS troubleshooting.

YES

YES

YES

OK

YES

Check

both end voltage of

D101

YES

YES

Check D101.

NO

Check if output of

D101(1SR35) is 5V.

YES

YES

YES

YES

Check IC101.

Q102_collector 0.6V LOW.

OK

Check if output of IC101

(KIA7042) is over 4.3V.

OK

NO

Replace IC101.

NO

Replace D101.

YES

Check Q102.

OK

NO

Replace Q102.

3-4

Check

IC100(78KOKF2)_

PIN 22, 24

OK

YES

YES

Refer to

micom troubleshooting

Check micom

voltage 5V.

PIN22

DATA PIN24 CLK

NONO

YES

Replace micom.

Check micom.

NO

YES

OK

6. IC103(KS4CD21CS) CHECK

3-5

FLD display check

YES

YES

Replace P3702.

Check each

PIN voltage.

NO

NO

YES

YES

OK

Replace IC301.

Check IC301.

NO

YES

Replace IC100FLD light on?

Check IC100.

NO

YES

YES

OK

Refer to SMPS

7. FLD DISPLAY CHECK

YES

YES

Check

P7904_PIN1, 2, 3 voltage

input.

NO

Check P3702 connection.

NO

If voltage is not 5V,

check input and output

of D319(1SR35).

YES

Check P3702

connection and power.

Pin1 : FL-22 Pin2 : FL+26

Pin3 : VKK- over

26V.

YES

YES

YES

YES

OKOK

76 PIN - > DO - - >

Check DATA in Check IC100.

NO

IC100

75 PIN - > STB

77 PIN - > 4PIN DI

78 PIN - > 1PIN CLK

Check data output.

IC100 - >

Check IC301

DATA communication.

PIN PIN
75PIN - > 3PIN STB
76PIN - > 2PIN D
78PIN - > 1PIN

CLK

Check

IC301(PT6324) voltage.

Pin50 VKK : -26V

PIN9.52 : +5V

Check if both end votage

of F1, F2 are over 3.7V.

VKK : over 26V.

3-6

8. PWM MODULATION PART CHECK

PWM modulation

part check

YES

YES

YES

YES

P7905_PIN9

3.3V checking

Check IC604(PS9829)

VDD PIN voltage(3, 7, 8,

10, 22, 29, 39, 47, 56, 65,

72, 94).

Check X601_PIN2 3.3V.

NO

Refer to

SMPS troubleshooting.

YES

YES

YES

YES

Check IC605_

PIN3 input and PIN2

output.

Check

X601 12.288MHz

operation.

Check IC605_

PIN8 3.3V.

Check IC605_

PIN3 input

Check X601

2.288MHz

NO

NO

IC604

(PS9829) PIN86 CLK

input check

NO

Check FB614

BEAD input, output and

voltage.

NO

Check X601

12.288MHz.

Replace X601.

OK

NO

OK

YES

YES

NO

Replace FB614

NO

Check IC605_

PIN2 output

YES

OK

YES

OK

Replace IC605.

NO

Check R680

(470Ω) output.

Replace R680.

NO

Check

IC604(PS9829) DATA

input.

Check each LINE

registor output.

NO

Check IC604

(PS9829) DATA input.

78 PIN->DATA

79 PIN->CLK

Check PWM

modulator output.

FL:75(+)74(-)

FR:71(+)70(-)

NO

NO

Check

DVD ASS`Y(PS9829)

communication

(P7403).

Refer to

CD troubleshooting.

NO

Check

IC100(78KOKF2)

21->PWM_CLK

22->PWM_DATA

43->PWM_REST

output.

NO

YES

YES

OK

YES

OK

Check IC604(PS9829).OK

Check

LINE registor output.

DATA:R671, CLK:R670

RST:R665

Replace R670, R671

and R665

NO

NO

Replace X601.

OK

YES

YES

YES

YES

3-7

Power AMP part check

YES

Check each LINE registor output voltage.

IC700 : R701, 702, 726, 727

NO

Check each

IC700, 701, 702, 703

PIN1,17, 18, 19, 36 +12V

input.

Refer to SMPS troubleshooting.

YES

YES

YES

NO

P7905_3PIN : +12V,

PIN13, 14, 15 : 35V.

YES

Replace the coils

YES

NO

Check output line coil.

Check PWM modulator input.

Each IC PIN4, 6, 14, 16

YES

Power IC700, 701, 702, 703

PIN20, 27, 29, 34 output.

Check each IC700, 701, 702, 703

PIN21, 26, 29, 34 input voltage.

OK

9. POWER AMP PART CHECK

3-8

10. AUX FUNCTION CHECK

AUX function check

Check µ-COM(IC301)_

PIN83, 84 commucation.

NO

NO

YES

Replace IC200

YES

YES

YES

Check

IC200(BU4052)_

PIN4, 11 input

waveform.

Check

IC200(BU4052)_PIN16

VDD, PIN8 VSS

power.

Refer to

SMPS troubleshooting.

NO

NO

YES

Replace IC801OK

YES

YES

Check

IC801(MC4580)_PIN 2, 6

input waveform.

Check

IC801(MC4580)_PIN4

VSS, PIN8 VDD

power.

Check IC200(BU4052)_

PIN3, 13 output waveform.

Check JK800 connection.

3-9

11. TUNER FUNCTION CHECK

TUNER function check

YES

Check IC200(BU4052)_

PIN16 VDD, PIN8 VSS power.

NO

Check

IC200(BU4052)_PIN3, 13

output waveform and IC601

(BU4052)_PIN2,15 input

waveform.

Check TUNER module voltage(PIN2 : 9V).

YES

YES

YES

YES

NO

Check TUNER

module(TU601) operation.

YES

Check IC801(MC4580)_

PIN4 VSS, PIN8 VDD power.

YES

NO

Check IC801(MC4580)_
PIN2, 6 input waveform.

Replace IC200.

Replace IC200.

Replace IC801.

Check IC200(BU4052)_PIN1, 12 input

waveform.

OK

3-10

12. TAPE FUNCTION CHECK

TAPE function check

YES

Check IC200(BU4052)_

PIN16 VDD, PIN8 VSS power

YES

YES

YES

NO

Check

IC200(BU4052)_PIN2, 15 input

waveform.

Check IC200(BU4052)_

PIN16 VDD, PIN8 VSS power

YES

NO

Check IC801(MC4580)_

PIN2, 6 input waveform.

YES

Replace IC200.

Replace IC200.

Replace IC200.

Check IC200(BU4052)_PIN3, 13

output waveform and IC601(BU4052)_

PIN2, 15 input waveform.

YES

TAPE PCB ASS`Y

OK

3-11

13. TAPE PLAY PART CHECK

TAPE PALY part check

Replace head wire and tape

deck mechanism.

NO

NO

YES

YES

Check A deck head input
IC201_PIN32, 39 and B deck
head input IC201_PIN34, 37.

YES

YES

YES

YES

Check IC201_

PIN5, 26 signal

output.

Check

IC201(HA12237)_PIN16

12V input.

Check A/B

deck head input.

NO

Refer to

SMPS troubleshooting.

Check IC202_PIN10 "HIGH"

NO

Check IC201_PIN14

mute operation.

Replace IC201.

NO

YES

OK

Check IC201

YES

Replace IC202.

NO

YES

OKOK

Check IC202.

3-12

14. TAPE REC PART CHECK

TAPE REC part check

Check IC100_PIN23 "HIGH"

NO

NO

YES

YES

Check IC201_

PIN7, 24 record input.

Check P2203_PIN5, 3 input

and PIN8 erase input.

YES

YES

YES

YES

YES

Check L203_PIN2, 3

oscillation.

Check

IC604(PS9829)_PIN49, 52

PWM output.

Check Q205(D1304)_

base "HIGH".

Replace IC201.

NO

NO

Check IC201_

PIN10, 21 output.

Check IC100_PIN23

"HIGH"

NO

Refer to PWM

modulation troubleshooting.

OK

YES

Replace IC202.

YES

OK

OK

3-13

INTERNAL BLOCK DIAGRAM OF ICs

1. ES6838

SDRAM/ROM

Interface

GPIO

+

Gateway

DMA

Controller

Huffman
Decoder

ROM

DRAM

Interface

RAM

Video

Processor

TV-Encoder

VDAC

HDMI I/F

Display

OSD / SPU

Controller

Scaler

DeIntelacer

16 K Cache

32-Bit

RISC

Processor

Audio ADC

Serial Audio

Interface

Audio DAC

USB

DVD

Descrambler

+

Transport

ATAPI

Servo Controller / RF

8051

µController

DSC

ECC

Digital

PLL

3-14

2. HA12237F

3-15

3. PS9829B

MBCK

SBCK

SLRCK

MLRCK

MSDIN[0:3]

SSDIN[0:3]

MIC_MCLK

DMIX_MCLK

OLRCK
OBCK

DMIX_SDOUT

PWM1_P/M

PWM2_P/M

PWM3_P/M

PWM4_P/M

PWM5_P/M

PWM6_P/M

PWM7_P/M

PWM8_P/M

PWM_HP_L_P/M

PWM_HP_R_P/M

PWM_SWL_P/M

EPD_ENA

OVERLOAD

MIC_BCK

MIC_LRCK

MIC_SDIN

SPI/I2C

SO/SDA

SCK/SCL

SI/I2C_AD0

/

CS/I2C_AD2

EXT_MUTE

CLK_IN

/RESET

PLL_DVDD

PLL_DVSS

PLL_AVDD

PLL_AVSS

DVDD

DVSS

IO_VSS

IO_VDD

Internal Controls

Internal Clock Internal Reset

Host
Interface
(I

2

C, SPI)

Mic,

Input

Processor

Input

Mapper

Sample

Rate

Converter

Input

&

Output

MUX

Serial Audio

Output

Interface

Down
Mixer

Mixer

4 Band

EQ

Bass

Manager

Main

Volume

Trim

Volume

Serial
Audio

Output

Interface

PWM

Modulator

POP

NR

Power Supply

Output Mapper

PLL

Reset & Power Down

Automatic

Gain

Limiter

4. PT6324

SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
SG7/KS7
SG8/KS8
SG9/KS9
SG10/KS10
SG11/KS11
SG12/KS12
SG13/KS13
SG14/KS14
SG15KS15
SG16/KS16
SG17
SG18
SG19
SG20
SG21
SG22
SG23
SG24

GR1
GR2
GR3
GR4
GR5
GR6
GR7
GR8
GR9
GR10
GR11
GR12
GR13
GR14
GR15
GR16

Segment Driver

Dimming Circuit

Grid

Driver

Control

DIN/DOUT

CLK

STB

OSC

LED1

K1 K2 VDD GND VEE

Timing Generator

Key Matrix Memory

LED

Driver

CSC

Serial

Data

Interface

Display Memory

3-16

5. STR-S6757IF1905

4

Vcc

Start

Stop

Burst

OSC

Protection
latch

DRIVE
Reg

Delay

Burst
Control

BSD

OCP

GND

S

D

FB

FB

OCP/BD

SS/OLP

BD

Q

Q

S

S

R

R

MaxON

RQ

S

OLP

Reg&

Iconst

Soft Start

Counter

Bottom Selector

5

7

6

3

2

1

OVP

3-17

6. TAS5142

2nd-Order L-C

Output Filter

for Each

Half-Bridge

Bootstrap

Capacitors

2-Channel

H-Bridge

BTL Mode

System

Microcontroller

OUT_A

OUT_B

OUT_C

OUT_D

BST_A

BST_B

BST_C

BST_D

RESET_AB
RESET_CD

System

Power

Supply

Hardwire

Mode

Control

PVDD

GVDD (12 V)/VDD (12 V)

GND

Hardwire

OC Limit

M1

M3

PVDD

Power

Supply

Decoupling

32 V

12 V

GND

VAC

PWM_A

PWM_C

PWM_D

PWM_B

V

ALID

M2

Left-

Channel

Output

Right-

Channel

Output

Input
HúBridge 1

Input
H-Bridge 2

GVDD

VDD

VREG

Power Supply

Decoupling

4

PVDD_A, B, C, D

GND_A, B, C, D

GVDD_A, B, C, D

4 4

VDD

GND

VREG

AGND

OC_ADJ

Bootstrap

Capacitors

2nd-Order L-C

Output Filter

for Each

Half-Bridge

SD

OTW

Output

H-Bridge 2

Output

H-Bridge 1

OTW

SD

T

AS5508

3-18

7. U1739EJ2V1UD00/KF2_E

Port 0 P00 to P06

7

Port 1 P10 to P17

8

Port 2 P20 to P27

7

Port 3 P30 to P33

4

Port 4 P40 to P47

8

Port 5 P50 to P57

8

Port 6 P60 to P678

Port 7 P70 to P778

Port 12 P120 to P124

5

Port 13 P130

Port 14 P140 to P145

6

8

4

2

Key return

Reset control

On-chip debug

Note 2

Multiplier &

divider

System

control

Volt age

regulator

REGC

XT2/EXCLKS/P124

XT1/P123

XT1/P121

RESET

OCD0A

Note 2

/X1, OCD1A

Note 2

/P31

KR0/P70 to
KR7/P77

OCD0B

Note 2

/X2, OCD1B

Note 2

/P32

X2/EXCLK/P122

Internal high-speed

oscillator

8

Buzzer output

BUZ/P141

Clock output
control

Power on clear/

low voltage

indicator

POC/LVI

control

PCL/P140

EXLVI/P120

VDD,

EVDD

VSS,

EVSS

FLMD0

16-bit timer/
event counter 00

TO00/TI010/P01

TO01/TI011/P06

TI000/P00

TI001/P05

TOH0/P15

TOH1/P16

TI50/TO50/P17

TI51/TO51/P33

RxD0/P11

TxD0/P10

RxD6/P14
TxD6/P13

SI10/P11

SO10/P12

SI11/P03

SO11/P02

SCK11/P04

SCK11/P05

SIA0/P143

SOA0/P144

SCKA0/P142

STB0/P145

BUSY0/P141

EXSCL0/P62

SDA0/P61

SCL0/P60

AV

REF

RxD6/P14 (LINSEL)

INTP0/P120

INTP1/P30 to

INTP4/P33

INTP5/P16

INTP6/P140,

INTP7/P141

AV

SS

ANI0/P20 to

ANI7/P27

SCK10/P10

RxD6/P14 (LINSEL)

16-bit timer/
event counter 01

8-bit timer H0

8-bit timer H1

Watchdog timer

78K/0

CPU
core

Internal

high-speed

RAM

Internal

expansion

RAM

Flash

memory

BANK

Note 1

Watch timer

8-bit timer
event counter 50

8-bit timer
event counter 51

Serial
interface UART0

LINSEL

Serial
interface UART6

Serial
interface CSI10

Serial
interface CSI11

Serial
interface CSIA0

Serial
interface IIC0

A/D converter

Interrupt

control

Internal low-speed

oscillator

3-19

MEMO

4-1

DVD ELECTRICAL TROUBLESHOOTING GUIDE

SECTION 4 DVD PART ELECTRICAL

1. POWER CHECK GUIDE

Power ON

Check DVD MD module.

OK

YES

YES

YES

YES

Does DVD/CD

appear at FLD?

Does

DISK1 appear

at FLD?

Does it

appear DVD ERROR

at FLD?

Func

Power ON

Does

AUX, FM 87.5.AM,

USB appear at

FLD?

YES

Check connector P7501

Check connector

(P400, P4004, P401).

Check an audio micom

or interface reconnect

(P4703)

Does No DISC or

Time are appeared

at FLD?

NO

NO

Check the

voltage of each PIN on

P5701.

NO

NO

NO

NO

YES

OK

Reconnect it.

4-2

2. TEST & DEBUG FLOW

Check AV cable

connection to TV set.

Power ON

Check connection lines

between FLASH & ES8380 or

the FLASH access time whether

is suitable or not.

NO NO

YES

Show LOGO?

Flash

memory operates

properly?

Check connection lines

between SDRAM (IC502) &

ES8380 or the SDRAM is

damaged.

NO

YES

SDRAM works

properly?

Check the related

circuit of ES6698FD (IC501)

PIN133,134,137,138,139,140

NO

YES

ES8380

VIDEO outputs

properly?

Check the cable

connection between DVD

PCB and MD (MECHA)

Check the MD mecha

NO NO

YES

Does

tray move

inside when it is at

closed position?

OPEN_SW &

CLOSC_SW signals on

PIN401 are OK

Check the output signal

of ES8380 to IC401 for

control OPEN / CLOSE

NO

YES

OPEN / CLOSE

signals on IC401 are

OK?

Check the tray control

I/O PIN on IC401.

NO

YES

Load+ & load-

signals on P4480

are OK?

YES

YES

B

4-3

Do not put in disc

and tray close.

Check the MD

Does

the SLED

move to inner side

when it is at outer

position?

Moter driver DRV-

MMUTE PIN is

high 3

NO

NO

YES

YES

YES

Check the related

circuit of SLED and

motor driver IC (IC401)

SLED

signal is OK?

NO

B

C

Check the cable

connection with MECHA.

Check focus connection on

ES8381 and motor

driver IC.

Optical

Lens is moving

for searching

Focus?

Proper

focus outputs to

motor driver?

NO

NO

YES

YES

YES

YES

Check the motor

driver (IC401).

Proper

F+ & F- outputs?

NO

Check cable connection

with pick-up head.

4-4

Put disc in tray. Laser off

Check the laser power circuit

between ES8381 and power

transistor. (Q405, Q406)

Laser

turns on when

reading disc?

DVDLD

or CDLD output

properly?

NO

NO

NO

YES

Check the related circuit of

laser power transistor.

Collector
voltage of power
transistor is OK?

(Q405, Q406)

NO

YES

YES

YES

C

D

Check cable connection

between P400 and

pick-up head.

Check the SPINDLE related

circuit on ES8380

Does SPINDLE

rotate?

Proper

SPINDLE signal

on ES8380.

NO

Check the SPINDLE control

of motor driver (IC404).

SPIN+ &

SPIN- output

properly?

NO

NO

YES

YES

YES

Check the cable

connection between

P400 and MD

4-5

Check the connections between

PDM01 and pick-up head.

Check the related circuit of

ES8380 focus signal.

Focus on OK?

Proper

signal on A, B, C, D

from MD?

NO

Proper

FOO signal on

IC401?

NO

NO

YES

YES

YES

D

E

Check cable connection

between P400 and MD.

Check the related circuit

between IC401 and ES8380

Check the tracking control

on motor driver (IC401).

Tracking OK?

Disc play?

Proper

TRO signal on

IC401?

NO

T+ & T- output

properly?

NO

NO

NO

YES

YES

YES

YES

Check cable connection

on pick-up head.

Check RF signal

waveform.

4-6

Check the connections between

ES8380 and P4703

All

outputs are OK

during playing

DISK?

Audio
signal data on
P8380 is OK?

NO

NO

YES

YES

E

Check the MAIN PCB

For example composite video,

check the video mute TR

(Q411), output of video buffer

IC (IC407) and ES8380

video signal data

TEST END

Picture

signal data on

ES8380 is OK?

NO

NO

4-7

3. USB PART

TURN ON USB

NO

Check the POWER supply circuit.

(Check P5701)

NO

Check the HRST# signal

Check the USB PART and

DVD PART line.

NO

NO

Check the USB DATA LINE. (P5301)

Check the IC501 (ES8380).

(Check DATA LINE PIN 98_USB_NO, 99_PO)

OK

YES

“Checking” or

“USB” display check

NO

YES

Check the USB JACK POWER supply.

(Check P5301)

Reading OK check

NO

4-8

WAVEFORMS

1. WHEN POWER ON, RESET & DATA ETC WAVEFORM

1. RESET(DVD)

2. RX

3. TX

4. LCS3# (FLASH)

Playing at USB function

1. HRST#

2. 5V

3. D-

4. D+

4-9

2. OPEN / CLOSE WAVEFORM AT POWER ON

1. open

2. UP-sw

3. DOWN-sw

4. close

3. STARTING ACTION WAVEFORM IN MD DEVICE

1. Driver STBY

2. SLEGN

3. SL+

4. SL­(At Power on)

4-10

4. FOCUS WAVEFORM (AT CD)

1. F+

2. F­(NO DISK)

5. FOCUS WAVEFORM (AT DVD)

1.Q401(DVD_LD)

2.Q402(CD_LD)
(INSERT CD)

4-11

6. AT POWER ON, SPINDLE SIGNAL AT MD DECK

1. Spind

2. Spin+

3. Spin-

7. AT FIRST ACTION, FOCUS SIGNAL A, B, C, D

1. A

2. B

3. C

4. D

4-12

8. TRACKING SIGNAL

1. Tro

2. Tr-

3. Tr+

9. RF WAVEFORM

4-13

10. DISK TYPE JUGEMENT WAVEFORM

1. F+

2. FDO

3. SVRRF

(DVD)

(CD)

4-14

MEMO

4-15 4-16

SCHEMATIC DIAGRAMS

1. MPEG SCHEMATIC DIAGRAM

4-17 4-18

2. SERVO SCHEMATIC DIAGRAM

3. INTERFACE SCHEMATIC DIAGRAM

4-19 4-20

4-21 4-22

DVD P.C.BOARD

(TOP VIEW)

PRINTED CIRCUIT DIAGRAM

4-23 4-24

DVD P.C.BOARD

(BOTTOM VIEW)

4-25 4-26

MEMO MEMO