LG DVD-2240-N Service manual

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

LOCATION OF CUSTOMER CONTROLS .......................................................................... 1-6

1-3

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC­TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY
VOID THE WARRANTY, BUT MA YLEAD TO YOUR BEING LIABLE FOR ANY
RESULTING PROPERTYDAMAGE 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 PROTEC­TION 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 AWAY
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 METALSURFACES 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 CIR­CUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI­NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN­DLE 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. VOLT­METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS­TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON­DUIT, 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 ARISK 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.

SUBJECT : X-RADIATION

1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER­SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN­TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC­TURE 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. OPERA­TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC­TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR­CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR­ABLE 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
ATYOUR 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 ORGA­NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU­LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE­DURE. 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, CUBBY­HOLE 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 RADIA­TORS WHERE STEAM LEAKAGE IS AFACTOR, ETC.

3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC­ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER­CIAL 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 APRODUCT 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 HAZ­ARDS OF TRYING TO ROLLA 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 THATA FOREST OF EXTENSIONS SPROUTING FROM A SIN­GLE 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
METALPART

1-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD player covered by this
service data and its supplements and addends, read and fol­low the SAFETY PRECAUTIONS. NOTE : if unforeseen cir­cumstances create conflict between the following servicing
precautions and any of the safety precautions in this publi­cations, always follow the safety precautions.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the DVD player 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 player 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 player 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 resis­tance between each blade of the attachment plug and acces­sible conductive parts (Note 1) should be more than 1M­ohm.
Note 1 : Accessible Conductive Parts including Metal pan­els, 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 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 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 grounded-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 elec­tricity sufficient to damage an ES device.)

2-2

DISASSEMBLY

CAUTION BEFORE STARTING SERVICING

Electronic parts are susceptible to static electricity and may easily 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 patrs 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)

Top Case

(A)

(A)

(A)

(A)

(A)

(A)

Tray Door

Disc T ra y

Front Panel

Stopper

Stopper

(B)

(B)

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. Release 2 screws (B).

4. 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

Main Circuit Board

Flexible
connector

Flexible
connector

A/V Circuit Board

(C)

(C)

(C)

(C)

(C)

(C)

(C)

(C)

(C)

(C)

(E)

(E)

(E)

(E)

(E)

(E)

Digitron
Circuit Board

Key
Circuit Board

Power Code

Power
Circuit
Board

(D)

(D)

(D)

(D)

Fig. 2-4

Fig. 2-5

Fig. 2-6

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)

1. Main/A/V Circuit Board

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

2. Release 10 screws (C), and take out the main /
AV circuit board.(See Fig.2-4)

3.Remove the flexible connectors and the
connector from main circuit board.

4. Then, remove the main A/V circuit board.

2. Power Circuit Board

1. Relrase 4 screws(D). (See Fig. 2-5)

3. Digitron and Key Circuit Board

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

2. Release 8 screws(E), and remove the digitron
circuit board.

2-4

EXPLODED VIEWS

1. Cabinet and Main Frame Section

463

260

452

462

250

462

462

462

462

463

463

A47

A43

A00

463

A46

PBS00

PBK00

PBT00

452

283

463

280

277

278

463

452

463

A48

463

463

300

PBJ00

455

A

5

4

3

2

1

BCD

2-5

2.Packing Accessory Section

3.Remote Control Section

BATTERY

808

CABLE

806

PACKING SHEET

804

PACKING

803

811

812

813

OWNER'S MANUAL

801

REMOCON

900

BOX CARTONX

802

PACKING

803

902

903

904

905

901

906

908

907

909

900

3-2

Replace Q908

and Q909.

1. Power Circuit

• Input Voltage : 90V - 135V

• It is possible to malfunction, if the unload condition is left for a long time when power is on.

(More than Dummy load 100mA)

• A Primary side is abnormal when the fuse is short, secondary side is abnormal when the IC103 oscillates
intermittently.

• The resistor value of both terminal is measured with DVM crossing each other to check the each element is
normal or abnormal. (It is normal when the numerical value is different each other.)

ELECTRICAL TROUBLESHOOTING GUIDE

Is F901 normal?

Is IC901 Pin 3

switching normally?

<Fig.3-1>

A primary side is abnormal.

Check the GND of C901 and
IC901 Pin 3 with oscilloscope.

When IC901
oscillating

Secondary side
is abnormal.

In condition of DC140V.
(Feedback is abnormal)

After connect
CON903
Pin 1 , 3 short.

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NONO

NO

NO

NO

(Fig. 3-1) IC901 Pin 3

Normal switching waveform on the

stand-by mode at the AC110V

NO

NO

NO

NO

NO

NO

NO

NO

Is CN903 Pin 3 5.2V?

Is voltage of BD901 140V?

Are R907, D902,

D903 and R902

normal?

Are D901, R904,

R905 and R906

normal?

Is PC901 normal?

Are CON902

Pin 5 , 6 and 9 5V?

Is CON904 Pin 3 8V?

Is CON902 Pin 3 12V?

Are CON903 Pin 5

-24V, Pin 7 -20V and
Pin 8 -16V?

END

END

(A)

To (A).

START

Does oscillate
continuously when
the CON903 is
disconnected ?

Front Circuit
Board is
abnormal

Are D908, D909,
D907, D910, D906
and D905 normal?

Replace
defective
parts.

Check Q904

and ZD903.

Replace

IC902.

Replace defective

parts.

Check or

replace

D908.

Are R922, C927,
R921 and R918
normal?

Is CON903 Pin 3

5.2V?

Is IC905
normal?

3-3

Replace IC101.

Refer to Front Part

Check short

Reconnect it.

2. µ-COM Circuit

A. No Power

Does Logo appear

on the screen?

Is oscillation of

X101 normal?

Are IC107 Pin 14 , 28

and 29 normal?

Do all five Bars appear?

Power RED LED on?

Does Bar appear at FLD?

Is CON107

connected normally?

Is CON107 Pin6 normal?

The
waveform on A[00:21]
and D[00:15] of IC108

normal?

Are IC101 Pin 7 , 8 normal?

Replace Main B/D.

Refer to Front Part.

Check the oscillation

Check short.

OK

Replace IC107

or IC108.

Check power.

(Refer to power)

If power is
normal

OK

POWER ON

1

1

YES

YES

YES

YES

YES

YES

YES

YES

YES

A

NO

NO

NO

NO

NO

NO

NO

NO

NONO

NO

A

3-4

B. Audio abnormal

D. Open/Close abnormal

Check the

connection of CON107.

Check IC101 Pin 13 , 14.

Check Audio jack.

YES (If OK)

YES

NO

NO

YES

YES (If OK)

YES

YES (If OK)

YES (If OK)

YES (If OK)

Check PLL FC 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)

YES (If OK)

YES (If OK)

YES (If OK)

Refer to Video part.

Refer to Encoder part.

Refer to MPEG part.

Replace B/D.

VIDEO ABNORMAL

3-5

E. Picture abnormal

Check the disc.

If OK

YES (If OK)

YES (If OK)

Refer to Servo part

Check PLL IC of MPEG part

Check DSP

Check MPEG

YES (If OK)

Replace B/D

PICTURE ABNORMAL

F. Disc Error

Check Disc

YES (If OK)

YES (If OK)

Refer to Servo part

Replace B/D

DISC ERROR

3-6

Power is on

Does LG 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. A

Check CD/DVD DSP output

signal.

B

Check MPEG Decoder input

signal.

C

D

E

F

G

H

I

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

Check clock signal

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

OK

OK

OK

OK

NO

NO

NO

NO

NO

3. MPEG Circuit

_ OPTION

_ If included VCD function.

3-7

NO

NO

NO

START

Does remote control

work normally?

Do all the

buttons work

normally?

Check waveform of

IC500 Pin13 .

Check waveform

of Q500 Pin 2 .

Is Digitron on normally?

LED ON?

Check waveform

of IC500 Pin 6 .

Is oscillation of

X501 normal?

Is waveform of IC500

Pin78 normal?

Check waveform
of IC500 Pin13 .

Does pulse

waveform of RE500 Pin 3

appear?

Is IC500

Pin24 connected to

RE500 Pin 3 ?

Is RE500 Pin 2 5V?

Power on.

Check and replace R516,
R507, R506, R500, R505,

R504, R512 and R503.

Solder defective parts again

Solder defective parts

Replace Q500.

Solder Key part.

Check Power.

Replace IC501.

Replace IC500.

Replace LED501.

Replace RE500

Re-solder.

Recheck

Replace IC500.Complete repairing Front B/D.

NO

NO

NO

NO

NO

NONONO

NO

YES

YES YES

YES

YES YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

CD

4. Front Circuit (Digitron & key)

3-8

Does signal pulse

input to IC206 Pin 58 , 59 when

the powe is on?

Does signal goes

"High" to IC206 Pin194 when the

power is on?

Does

TTL pulse output to

IC206 Pin14, 14?

Does

33.8688MHz clock input
to IC206 Pin 63?

Is IC206

Pin83, 84, 88, 89 voltage

about 2.2V?

Replace IC206

(IC206 soldering or IC defect).

Replace IC700

(IC700 soldering or IC defect)

Check "2.µ-COM Part".

Replace X301 or

IC308(30MHz clock defect)

CHECK POINT(General)

5. RF/Servo Circuit

A.

END

NO

NO

NO NO

NO

YES

YES

YESYES

YES

3-9

Does tray open or close?

Does the pick-up

slide inner or outer

track?

Fig.1. SLED Driver waveform

Fig.2. Focus Driver waveform

Does

the voltage change

at IC401 Pin 15 , 16 more than

2V on the basis of

4.5V?

Pressing

the open/close key

repeatedly, check the voltage of

CON202 Pin 9 change

0V to 5V

Junction Board

Does

CON202 Pin17 change

high to low?

Does

the pick-up lens move up

and down?

Check Focus Driver output.

(IC206 Pin 83, IC401 Pins 11,12)

Check SLED Driver output.

IC206 Pin 88 IC401 Pins 18 ,17.

IC206 Pin 88 no output : IC206 is defective
IC401 Pin 18 no output : IC401 is defective

IC206 Pin 83 no output : IC700 is defective
IC401 Pin 1 , 2 no output : IC701 is defective

DECK assembly is defective.

Slide the pick-up to

inner track.

Power on

Check loading Part.

Push Pick-up to inner track to

the end by hand.

DECK assembly is defective.

(Limit sw)

check µ-COM Part.

Replace IC401.

No disc

B.

END

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

3-10

FOCUS ON?

Check

the focus error moving the

lens up and down.

(IC201 Pin 21)

Does the

TTL level change at IC206

Pin 78 and 13 moving

the lens?

Does the disc turn?

IC206 Pin16 is "High"?

Is OK the track jump.

Does the signal

pulse input at IC700 Pin 27,

28 , and 29?

Does the screen appear?

OPEN/CLOSE

Replace µ-COM or IC206.

Replace IC206.

Check IC201 Pin 52 , 53 , 54 , 55 in DVD Mode

Check IC201 Pin 58 , 59 , 60 , 61 in CD Mode

Fig.3. FOCUS ERROR waveform

IC201 no output : Pick-up is defective.

Check IC206 and IC403 when the Pin 4 is abnormal

Check CON404 Pin4, 6 Motor

turn when the Pin4 is less than 1.6V

Check A

Video Par is defective.

Check "5.MPEG Circuit."

Check "7.OSD/Video Circuit."

Replace IC700.

µ-COM part is

defective. Check

"2.µ-COM Circuit."

DISC IN

C.

END

NO

NO

NO

NO NO

NO

NO

NO

YES

YES

YES

YES

YES

YES YES

YES

3-11

Is the eye-pattern vivid?

Does the

sawtooth waveform emit

at IC201 Pin 20 ?

Does the 1.6V emit?

Check RF Eye-Pattern.

RF : 1.0-2.1V(IC201 Pin 28)

Fig.5. RF
waveform

Check IC201 Pin 52 , 53 , 54 , 55 in DVD Mode.
Check IC201 Pin 58 , 59 , 60 , 61 in CD Mode.

No signal: Pick-up is defective

Replace IC206.

Check IC206 Pin84.

No signal at IC206 : IC206 is defective

• Check IC206 Pin 162

• Check the clock at the IC206 Pin 28, 30 .

• Both are normal : IC206 is defective

Replace IC201.

CHECK A

D.

END

NO

NO NO NO

YES

YES YES YES

3-40 3-41

2. A/V P.C.BOARD

4. POWER (SMPS) P.C.BOARD

3. KEY P.C.BOARD

3-42 3-43

LOCATION GUIDE

LOCATION GUIDE

5. JUNCTION P.C.BOARD

6. TIMER / SHUTTLE P.C.BOARD

3-12

BLOCK DIAGRAMS

1. Overall Block Diagram

M

M

POWER CONTROL

RXDO/TXDO/SCKO
F_Reg/M_Reg/M_Reset/MD_SW

LOADING DRIVE

SENS, FOK, SLD_FG,
MSDAT0,DEFECT,DSP_SENSE,
SQSO, SQCK, SCOR, AO[0:5]
XLA T, S_CLK, S_DATA, DO[0:7]

27MHz

VDATA[0:7]

Hsync

Vsync

Composite, Y , C

Component

DVD_LDQM, DVD_SD_CS1

DVD_MA[0:11]

DVD_MD[0:15]

DVD_SD_CS0,
DVD_UDQM

DVD_DATA[0:7]
SDCLKI, ZISENB

REQZI

33.8688MHz

DA_DATA,
DA_LRCK,
DA_BCK

DA_XCK

DVD_SD_CAS,
DVD_SD_RAS
DVD_SD_CLK
DVD_MWE

D[00:07]
A[00:02]

S_CLK, S_DATA,
DPLL_L

IIC_DATA,
IIC_CLK

DAC_L0,
S_CLK
S_DATA

L

L

AUDIO

OUT

VIDEO OUT

R

Composite

CY

R

FILTER

AMP

DA_DATA,

DA_LRCK,

DA_BCK

27MHz
X-TAL

SPINDLE_FG, SLD_FG

FDO,TDO,
FMO

MON, SPINDLE_DRV

TEBAL, FEBAL,
DPOCTL, EQF, EQB

FE, TE, RFRP, SBADD, DVD/CD RF

ICADDR[0:8]

ICDATA[00:15]

RFRP, RFCen,
TE, Vref

DVD : A, B, C, D
DVD : RF
CD : A, B, E, F

spindle

Loading

focus, tracking sled

SPINDLE
MOTOR

DISC

LOADING
MOTOR

OPEN S/W

CLOSE S/W

LIMIT S/W

DECK MECHANISM

AC 100
~240V,
50
~60Hz

-22.5V

-27V

-21.8V
+9V
+5VA
+5VD
+5VU
AGND,GND,UGND

PICK
UP

PbPrY

FILTER

IC308

PLL1700

CLOCK

GENERATROR

IC400

BA6859FP

SPINDLE

MOTOR
DRIVER

IC401

BA5983
POWER
DRIVER

IC206

DVDSP-3301

CD/DVD DSP

DVD SER VO

DRAM

256K x 16bit

Comp.

POWER
BOARD

IC800/IC801

BT865A/861A

NTSC/PAL

Encoder

IC703/IC601~603

PCM176x4

AUDIO

DAC

IC108

SH7034

IC301

ZiVA-3

MPEG A/V

Decoder

IC306

GM72V1621

1M X 16bit

SDRAM

IC307

GM72V1621

1M x 16bit

SDRAM

IC201

TA1254F

RF SIGNAL

PROCESSOR

IC500

LC866112

FL DISPLAY

KEY INPUT

REMOCON

RECEIVER

DRAM

FLASH

MEMORY

3-36 3-37

PRINTED CIRCUIT DIAGRAMS

1. MAIN P.C.BOARD (TOP SIDE)

3-38 3-39

1. MAIN P.C.BOARD (BOTTOM SIDE)