Lg Dv6812e4 User manual

DVD VIDEO PLAYER

SERVICE MANUAL

MODEL: DVD5185(DV6812E4)

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”

IN THIS MANUAL.

MODEL: DVD5185(DV6812E4)SERVICE MANUAL

P/NO : 3829RHPOO9YJULY,2002

CONTENTS

SECTION 1 . . . .SUMMARY

SECTION 2 . . . .CABINET & MAIN CHASSIS

SECTION 3 . . . .ELECTRICAL

SECTION 4 . . . .MECHANISM

SECTION 5 . . . .REPLACEMENT PARTS LIST

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

........................... 1-3

SERVICING PRECAUTIONS .................................................................................................. 1-4

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SPECIFICATIONS ...................................................................................................................... 1-5

1-3

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,

NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-

TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY

VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY

RESULTING PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE

THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY

CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE,

INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE

USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC-

TION FROM A.C. LINE SHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A

CHECK SHOULD BE MADE OF THE FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD

1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY

AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.

THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE

TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES

SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN

RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE

BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE

SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN

DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD

SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS.

BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION

TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED

INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY

FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR

A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND

PROTRUNING METAL SURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF

RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT

FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS

OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR-

CUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.

LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-

NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN-

DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE

WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE

ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT-

METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN

THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-

TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR

BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON-

DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME.

MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500

OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG

AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED

METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75

VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY

VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK

HAZARD AND MUST BE CORRECTED IMMEDIATELY.

SUBJECT: 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 MAG-

NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN-

GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO

THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN

SERVICE LITERATURE.

SUBJECT : X-RADIATION

1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER-

SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-

TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-

TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN

THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE

PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA-

TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-

TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-

CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-

ABLE LEVELS.

2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE

USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN

COLOR SETS, ALWAYS RE-INSTALL THEM.

3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN

ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA

TION OF THE METER SHOULD BE CHECKED PERIODICALLY

AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE

AT YOUR DISTRIBUTOR.

4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY

THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY

TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD

BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE

WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES

NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING

CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA-

NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-

LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-

DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON

EACH CUSTOMER’S INVOICE.

5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN

A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,

AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND

THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT

LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES

SIVE VOLTAGE.

6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES

DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS

(WHERE USED).

SUBJECT: IMPLOSION

1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE

GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE

TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID

SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.

2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.

SUBJECT : TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-

HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO

HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.

2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO

INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA-

TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.

3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR

VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-

ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT

OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-

CIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED

MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR

PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT

THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW

ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS

MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE

TEST ON CUSTOMIZED INSTALLATIONS.

5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON

SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS

PROPERLY SECURED.

6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS

MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-

ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS

THRESHOLDS OR DEEP PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND

WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES,

INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION

RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF

THE SAME OR LARGER SCREEN SIZE.

8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,

EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN-

GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO

HOME AND FAMILY.

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. VOLTMETER

GOOD EARTH GROUND

SUCH AS THE WATER

PIPE. CONDUIT. ETC

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

1-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD covered by this service

data and its supplements and addends, read and follow the

SAFETY PRECAUTIONS. NOTE : if unforeseen circum-

stances create conflict between the following servicing pre-

cautions and any of the safety precautions in this publica-

tions, always follow the safety precautions.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the DVD AC power cord from the AC

power source before:

(1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnection or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an elec-

trolytic capacitor.

Caution : A wrong part substitution or incorrect

polarity installation of electrolytic capacitors may result

in an explosion hazard.

2. Do not spray chemicals on or near this DVD or any of

its assemblies.

3. Unless specified otherwise in this service data, clean

electrical contacts by applying an appropriate contact

cleaning solution to the contacts with a pipe cleaner,

cotton-tipped swab, or comparable soft applicator.

Unless specified otherwise in this service data, lubrication

of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with

whitch instruments covered by this service manual might

be equipped.

5. Do not apply AC power to this DVD and/or any of its

electrical assemblies unless all solid-state device heat

sinks are cerrectly installed.

6. Always connect test instrument ground lead to the

appropriate ground before connection the test instrument

positive lead. Always remove the test instrument ground

lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn

the power on. Connect an insulation resistance meter(500V)

to the blades of the attachment plug. The insulation resis-

tance between each blade of the attachment plug and acces-

sible conductive parts (Note 1) should be more than 1M-

ohm.

Note 1 : Accessible Conductive Parts including Metal pan-

els, Input terminals, Earphone jacks, etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged

easily by static electricity. Such components commonly are

called Electrostatically Sensitive (ES) Devices. Examples of

typical ES 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 compo-

nent or semiconductor-equipped assembly, drain off any

electrostatic charge on your body by touching a known

earth ground. Alternatively, obtain and wear a commer-

cially 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 ES

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 grouned-tip soldering iron to solder or unsolder

ES devices.

4. Use only an anti-static solder removal device. Some

solder removal devices not classified a “anti-static”can

generate electrical charges sufficient to damage ES

devices.

5. Do not use freon-propelled chemicals. These can

generate electrical charge sufficient to damage ES

devices.

6. Do not remove a replacement ES device from its protec

tive package until immediately before you are ready to

install it. (Most replacement ES devices are packaged with

leads electrically shorted together by conductive foam,

aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from

the leads of a replacement ES device, touch the protective

material to the chassis or circuit assembly into which the

device will be installed.

Caution : Be sure no power is applied to the chassis or

circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged

replacement ES devices. (Normally harmless motion such

as the brushing together of your clothes fabric or the lifting

of your foot from a carpeted floor can generate static elec-

tricity sufficient to damage an ES device.)

1-5

SPECIFICATIONS

•GENERAL

Power requirements AC 110~240V, 50/60Hz

Power consumption 14W

Dimensions(approx.) 430 x 64 x 245mm (W/h/d)

Mass(approx.) 2.8kg

Operating temperature 5˚C to 40˚C (41˚F to 104˚F)

Operating humidity 5% to 9%

•SYSTEM

Laser Semiconductor laser, wavelength 650nm

Signal system PAL/NTSC

Frequency response DVD (PCM 96kHz): 8Hz to 44kHz

DVD (PCM 48kHz): 2Hz to 22kHz

CD: 8Hz to 20kHz

Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only)

Harmonic distortion Less than 0.008%

Dynamic range More than 100dB(DVD)

More than 95dB(CD)

•OUTPUTS

VIDEO OUT 1 V (p-p) 75 Ω, sync negative, RCA jack x 1/SCART(TO TV)

Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1

Audio output (analog audio) 2.0 Vrms (1 kHz, 0 dB), 330 Ω,

RCA jack (L, R) x 1/SCART(TO TV)

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

1. DISASSEMBLY.........................................................................................................................2-2

CABINET DISASSEMBLY ............................................................................................................2-2

CIRCUIT BOARD DISASSEMBLY ...............................................................................................2-3

2. EXPLODED VIEWS ................................................................................................................2-4

1. Cabinet and Main Frame Section ...........................................................................................2-4

2. Packing Accessory Section....................................................................................................2-5

2-2

DISASSEMBLY

CAUTION BEFORE STARTING SERVICING

Electronic parts are susceptible to static electricity and may easily and damaged, so do not forget to take a

proper grounding treatment as required.

Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a

magnetized screw driver in servicing. Several kinds of screws are used and some of them need special

cautions. That is, take care of the tapping screws securing molded parts and fine pitch screws used to secure

metal parts. If they are used improperly, the screw holes will be easily damaged and the parts can not be fixed.

(A)

(A) (A)

(A)

Top Case

(A)

Tray Door

Disc Tray

Fig. 2-3

Stopper

Front Panel

OPTIONAL

PART

CABINET DISASSEMBLY

1. Top Case

1. Release 7 screws (A). (See Fig. 2-1)

2. Lift the top case with holding the back of it,

and remove it in the direction of the arrow

Fig. 2-1

Fig. 2-2

Fig. 2-3

3. Front Panel

1. Eject the disc tray. (See Fig. 2-2)

2. Remove the tray door. (See Fig. 2-2)

3. Pull the front panel toward you while pressing

7 stoppers to disengage, and remove the front

panel. (See Fig. 2-3)

2.Tray Door

1.Eject the disc tray.

2.Lift up the tray door in the direction of the

arrow.

2-3

OPTIONAL

PART

Interface

Board

Main Circu

Board

(B)

(B) (B)

(B)

(C)

Key

Circuit Board

(D)

Fig. 2-4

Fig. 2-5

1. Disassembling of Main Circuit Board

and Interface Board

1. Remove the top case.(See Fig. 2-1)

2. Remove 14 screw (B).

3. Remove the Deck from Main Circuit Board.

4. Remove Main Circuit Board from Interface Board.

5. Remove 2 screw (C).

6. Remove Interface Board from the chassis.

CIRCUIT BOARD DISASSEMBLY

Note: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.

After replacing the main circuit board, open the land after inserting the flexible connector.

(Refer to Mechanism Disassembly)

2. Digitron and Key Circuit Board

1. Remove the front panel.(See Fig. 2-3)

2. Release 3 screws (D), and remove the digitron

circuit board.

2-4

EXPLODED VIEWS

1. Cabinet and Main Frame Section

283

467

300

A48

452

280

465

457

275

332

OPTIONAL PART

PBT00

463

A46

250

463

260

A00

BCD

2. Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

806

813

OWNER'S MANUAL

RF CABLE

810 CABLE SET ASS'Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

811

812

PLUG ASS'Y 1WAY

PLUG ASS'Y 2WAY

2-5

3-1

SECTION 3

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2

1. Power(SMPS) Circuit...............................................................................................................3-2

2. µ-com Circuit............................................................................................................................3-3

3. MPEG Circuit............................................................................................................................3-6

4. Front Circuit(Digitron & Key) ................................................................................................3-7

5. RF/Servo Circuit ......................................................................................................................3-8

6. KARAOKE Circuit (KARAOKE MODEL ONLY)....................................................................3-12

BLOCK DIAGRAMS ..................................................................................................................3-13

1. Overall Block Diagram ..........................................................................................................3-13

2. Power (SMPS) Block Diagram..............................................................................................3-14

3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-15

4. Audio Block Diagram ............................................................................................................3-16

5. MPEG & MEMORY Block Diagram.......................................................................................3-17

6. KARAOKE Block Diagram (KARAOKE MODEL ONLY)......................................................3-18

CIRCUIT DIAGRAMS................................................................................................................3-19

1. Power (SMPS) Circuit Diagram ............................................................................................3-19

2. DVD DSP Circuit Diagram.....................................................................................................3-21

3. Drive & RF Circuit Diagram ..................................................................................................3-23

4. MPEG Circuit Diagram ..........................................................................................................3-25

•WAVEFORMS ...........................................................................................................................3-27

5. Audio Circuit Diagram...........................................................................................................3-29

6. MEMORY Circuit Diagram .....................................................................................................3-31

7. FRONT & MIC Circuit Diagram .............................................................................................3-33

8. A/V JACK Circuit Diagram ....................................................................................................3-35

•CIRCUIT VOLTAGE CHART ....................................................................................................3-37

PRINTED CIRCUIT DIAGRAMS ............................................................................................3-41

1. MAIN P.C.BOARD ...................................................................................................................3-41

2. POWER,A/V,FRONT P.C.BOARD ..........................................................................................3-43

3. KEY P.C.BOARD.....................................................................................................................3-45

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

No 5V_D

or 5V_A .

No 5.2VA.

Is 5.2VA section working?

Is oscillation present at the

Base of Q108?

Replace Q108.

Check L103.

Replace BD101.

(Bridge rectifier)

Check Fuse(F101).

Is 5.2V applied to IC102

Pin 1?

Is there a DC voltage at the

(+) terminal of BD101?

Replace IC101.

Check R127, 128.

(SHUTDOWN CKT)

1. Power(SMPS) Circuit

No VF+

Is 5.2VA section working?

Replace D109.

Is oscillation present at the

anode of D109?

YES

YES YES

YES

A. B.

3-3

Replace IC301.

Refer to Front Part

Check short

Reconnect it.

2. µ-COM Circuit

A. No Power

Does Logo appear

on the screen?

Is oscillation of

X501 normal?

Are IC503 Pins 193, 80

and 81 normal?

Does no DISC appear?

Does Hello

appear at FLD?

Is P5901

connected normally?

Is P5901 Pin 23 normal?

The waveform

on AD(00~21) of IC501

normal?

Are IC301 Pins 5, 26 normal?

Replace Main B/D.

Check the oscillation

Check short.

Replace IC501

Check power.

(Refer to power)

If power is

normal

POWER ON

YES

NONO

3-4

B. Audio abnormal

D. Open/Close abnormal

Check the

connection of P5901.

Check IC301 Pins 3, 4.

Check Audio jack.

YES (If OK)

YES

YES (If OK)

YES

YES (If OK)

Check MPEG_CLK Signal

of MPEG part.

Refer to Audio part.

Refer to MPEG part.

Replace B/D.

Check Front.

Reconnect it.

Refer to SERVO part.

Check the connection of MD.

AUDIO ABNORMAL

OPEN/CLOSE ABNORMAL

C. Video abnormal

Check Video jack.

YES (If OK)

Refer to Video part.

Refer to MPEG part.

Replace B/D.

VIDEO ABNORMAL

3-5

E. Picture abnormal

Check the disc.

If OK

YES (If OK)

Refer to Servo part

Check MPEG_CLK Signal

of MPEG part

Check DSP

Check MPEG

YES (If OK)

Replace B/D

PICTURE ABNORMAL

F. Disc Error

Check Disc

YES (If OK)

Refer to Servo part

Replace B/D

DISC ERROR

3-6

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@@g

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Power is on

Does Logo appear

on the screen?

Does the

moving picture of the DVD Disc

play on the screen

normally?

Is MPEG data signal normal?

Is error signal normal?

Is MPEG data signal normal?

Is Clock normal?

Does the audio

sound output from MPEG

decoder?

Does the

moving picture of the video

CD play on the screen

normally?

Does the audio sound

output normally?

END

Check power & clock.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check clock signal

YES

YES YES

YES

NO NO

OK OK

3. MPEG Circuit

_OPTION

_ If included VCD function.

3-7

START

Does remote control

work normally?

Do all the

buttons work

normally?

Check waveform of

IC901 Pin 14.

Check waveform

of IC901 Pin 18, 19.

Is Digitron on normally?

LED ON?

Check waveform

of IC901 Pin 7.

Is oscillation of

X901 normal?

Is waveform of IC901

Pin 21 normal?

Check waveform

of IC901 Pin 14.

Does pulse

waveform of RC901 Pin 1

appear?

Is IC901

Pin 17 connected to

RC901 Pin 1 ?

Is RC901 Pin 2 5V?

Power on.

Check and replace

R903,R912, R904, R905,

R941, R906, R907.

Solder defective parts again.

Solder defective parts

Replace IC901.

Solder Key part.

Check Power.

Replace IC902.

Replace IC901.

Replace LED913.

Replace RC901.

Re-solder.

Recheck

Replace IC901.Complete repairing Front B/D.

NONONO

YES

YES YES

YES

YES YES

YES

YES YES

YES

YES YES

YES

4. Front Circuit (Digitron & key)

3-8

Does signal pulse

input to IC201 Pins 53, 54 when

the power is on?

Does signal goes

"High" to IC201 Pin186 when the

power is on?

Does

TTL pulse output to

IC201 Pin 156?

Does

33.8688MHz clock input

to IC201 Pin 59?

Is IC201

Pins 79, 80, 84, 88 voltage

about 2.2V?

Replace IC201

(IC206 soldering or IC defect).

Check power circuit.

Check "2.µ-COM Part".

Replace X201 or IC206

(33MHz clock defect)

CHECK POINT(General)

5. RF/Servo Circuit

END

NO NO

YES

YESYES

YES

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