LG DVP7772 User manual

1-1
CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . EXPLODED VIEWS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-3
SERVICING PRECAUTIONS ................................................................................................... 1-4
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.
SUB ECT : 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.
. 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.
SUB ECT: 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.
. 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.
. 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.
. 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 PORTABLE DVD covered
by this service data and its supplements and addends, read
and follow the SAFETY PRECAUTIONS. NOTE : if unfore-
seen 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 PORTABLE DVD AC power cord from
the AC power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
( ) 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.
. Do not spray chemicals on or near this PORTABLE 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 PORTABLE 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.
. 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
[DVD player]
Power supply DC 9.8 V (AC adapter terminal), DC 7.4 V (Battery)
Power consumption 5 W with battery
Weight 1 .6 lbs (0.66 kg) (without battery pack)
External dimensions (W X D X H) 7.3 x 5.9 x 1.0 inches (186 x 150 x 5 mm)
Signal system PAL
Laser Semiconductor laser, wavelength 650 nm (DVD),
780 nm (CD)
Frequency range (audio) DVD linear sound: 48kHz sampling 4 Hz to 0 kHz
96kHz sampling 4 Hz to 44 kHz
Signal-to-noise ratio (audio) More than 95 dB
Dynamic range (audio) More than 95 dB
Harmonic distortion (audio) 0.08 %
Operating conditions Temperature: 41°F to 95°F, Operation status: Horizontal
[Connectors]
Video input/output (VIDEO In/Out) 1.0 V (p-p), 75 Ω, negative sync., ø3.5mm mini jack x 1
Audio output (optical audio) Optical connector (ø3.5mm) x 1
Audio input/output .0 Vrms(1 KHz, 0 dB), ø3.5mm mini jack x 1
(AUDIO In/Out, analog audio)
Earphone terminal ø3.5mm stereo mini jack x 1
[Liquid Crystal Display]
Panel size 7 inches (16:9)
Projection system TN color transmission
Driving system TFT active matrix
Resolution 800 x 480 (effective pixel rate: more than 99.99%)
[Supplied Accessories]
• RCAAudio/Video cable . . . . . . . . . . . . . . . . . . . .1
• AC Adapter (AD-DP40) . . . . . . . . . . . . . . . . . . . .1
• Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
• Battery Pack (DP-BT50) . . . . . . . . . . . . . . . . . . .1
• Remote control . . . . . . . . . . . . . . . . . . . . . . . . . .1
• Battery for Remote control (Lithium) . . . . . . . . . . .1

2-1
SECTION 2
EXPLODED VIEWS
CONTENTS
EXPLODED VIEWS .....................................................................................................................2-2
Cabinet and Main Frame Section ..............................................................................................2-2
Deck Mechanism Section ...........................................................................................................2-3
Packing Accessory Section .......................................................................................................2-4

2-2
EXPLODED VIEWS
• Cabinet and Main Frame Section
250
A48
290
275
277
A42
273
277
272
276
A49
274
A45
A44
809
280
286
284
281
285 283
282
A46
260 264
261
268
291 270
269
267
266
262
265
263
A43 A00
294
293
295
292
296
254
254
253
253
251
252
286
A41
A
5
4
3
2
1
BCD

2-3
• Deck Mechanism Section
433
433
005
002
012
011
434
021
013
432
021
021
A02
A01
014
433
015
001
430
430
004
003
431

2-4
• Packing Accessory Section
PACKING SHEET
804
PACKING
OPTIONAL PARTS
803
OWNER’S MANUAL
801
REMOCON
900
R/C BATTERY
808
BOX CARTONX
802
PACKING
803
300 POWER CORD
830 AC ADAPTER
831 ADAPTER DC DC 12
814 PLUG ASS’Y
BATTERY
809

3-1
SECTION 3
ELECTRICAL
CONTENTS
LCD PART ................................................................................................................3-2
ELECTRICAL TROUBLE SHOOTING GUIDE ......................................................3-16
BLCOK DIAGRAMS ..............................................................................................3-25
CIRCUIT DIAGRAM ................................................................................................3-28
PRINTED CIRCUIT DIAGRAMS ............................................................................3-58

1) Power measuring
Measure each power after power supply.
CE809(+): -10V, CE81 (+): +15V, C8 8: +7.5V, CE8F6: +5V, CE8H1: +9.8V
2) VCO frequency adjustment
Change the VR805 when there is no signal (video signal off) and adjust to 9.1MHz(error: +/-
0.03MHz) with a frequency counter.
Check the LCD operates at 9.68MHz when applying video signal with a frequency counter.
3) VCOM waveform adjustment
Adjust the VCOM level while changing the VR801 as below waveform by using the scope in the
CE814.
3-2
Vcom Waveform
63.5
63.5
µs
5.
5.
3Vp-p
3Vp-p
0.7V
4.6V
GND
GND
LCD PART

4) Adjustment of screen center position
Change and adjust the VR80 so that the middle vertical line between Green and magenta is
located at the center of the LCD Panel on the Full color bar screen.
5) Removal of horizontal line noise
Remove a thick horizontal line noise while changing the VR803 and monitoring the logo screen.
Remove a thin horizontal line noise while viewing the logo screen after removing a thick horizon-
tal line noise via the VR803.
3-3
Full color bar screen

3-4
DESPLAY CONDITION? INVERTOR ABNORMAL
appear shadow form interference
in black background
There is only bright light.(LCD B/D abnormal)
FUSE Replace
IC8F1, IC8F Check and Replace
T801, D8F1, D8F , D8F3 Check
Main B/D on located
IC8F3 Check and Replace
A/V IN S/W Check
X801, C83 Replace
IC801, IC803 Check and Replace
IC805 Check and Replace
D801, L819, IC804 VCO Check and Replace
Q810 Check and Replace
FUSE(F801)Normal?
Q8F1 Normal operate?
7.5V, 15V, -10V Normal?
+5V Normal?
Y/C Display signal?
X801 operate?
R.G.B signal output?
VCOM signal?(6.5Vpp)
VCO Normal operate?
H/V SYNC?
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
LCD TROUBLE SHOOTING GUIDE(1/2)

3-5
IC80 ’s CLK and CONT signal? IC80 Replace
MAIN B/D Check
LCD MODE CONT signal?
ALL “LOW”(NORMAL condition)
TFT LCD pressure voltage?
+15V, -10V, +5V Power source and D803, D804 Check
TFT LCD Normal? Replace
Color Adjusting Normal? Readjust as adjustement standard.
Each CONNECTOR? Replace and Reassemble
INVERTOR Normal? Replace
END
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
LCD TROUBLE SHOOTING GUIDE(2/2)

3-6
LCD BLOCK DIAGRAM
INVERTER TFT LCD 7" WIDE
(480X3X234)
DC-DC
CONV
CHROMA IC
(IR3Y29B)
COLOR
CONTROL
CONTROL
(UPS017)
VCO
C_SYNC H/V SYNC
15V
-10V
7.5V
5V
DC9.8V OR BAT7.2V
Y/C OR CVBS
RGB VCOM
CLK
STH
STV
OEV
LCD MODE
AV I/O CON

3-16
ELECTRICAL TROUBLE SHOOTING GUIDE
1. Power (DC-DC Converter) Circuit
A.
NO POWER ON
by ADAPTORNO POWER ON
by BATTERY
Is ADAPTOR
OUT 9.8V? Is BATTERY
OK?
Is F101 OK?
Is LF101 OK?
Replace F101
YES
Is
Is F102 OK?
D105 OK?Replace D105
Replace ADAPTOR
NO +1.8V
Is Q102 OK?
NO -5VNO + 5V
NO +3.3V NO LCD POWER
Replace
Q102
Is E+5V OK?
Replace
Q103
Replace IC104
Replace IC103
Replace L437
Is Q104 OK? Is Q104 OK?
Replace
Q104
Replace
Q104
Replace IC108
Is Q105 OK?
Replac F102
Is Q102 OK?
Replace Q102
Replace BATTERY
Replace
Q105
Is Q105 OK?
Replace
Q105
Replace LF101
NO NO
YES

3-17
AUDIO OUT ABNORMAL VIDEO OUT ABNORMAL
Check Audio Jack &
Mode
Check +5V , -5V
Check Signals from MPEG
Replace IC301
Check Video Jack &
Mode
Check Video signals
from MPEG
Check IC402
Check LC Filter
AUDIO IN/SPEAKER
ABNORMAL
Check Audio Jack &
Mode S/W
Is Q305 OK ?
VIDEO IN ABNORMAL
Check Video Jack &
Mode
Is IC401 OK ?
Check CON403
Is VR300 OK ?
Replace
Q305
Replace
VR300
Is Speakers OK ?Replace
Speakers
Replace IC306
Replace
IC401
Refer to LCD part
B. Audio Out abnormal C. Video Out abnormal
D. Audio In/Speaker abnormal E. Video In abnormal

3-18
Check the disc.
If OK
YES (If OK)
YES (If OK)
Refer to Servo part
Check MPEG_CLK Signal
of MPEG part
Check MPEG
(IC500)
Replace B/D
PICTURE ABNORMAL
Check Disc
YES (If OK)
YES (If OK)
Refer to Servo part
Replace B/D
DISC ERROR
Check
SW501 switch
Check IC500 pin49
YES
NO
YES
YES (If OK)
YES
Refer to SERVO part.
Check the connection of MD.
OPEN/CLOSE ABNORMAL
F. Picture abnormal
H. Open/Close abnormal
G. Disc Error

3-19
2. MPEG Circuit
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
signal 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
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
OPTION
If included VCD function.

3-20
3. Front Circuit(Dogotrpm & Key)
NO
NO
NO
START
Does remote control
work normally?
Do all the
buttons work
normally?
Check waveform of
IC701 Pin1, 2
Check waveform
of IC701 Pin41, 42.
Is Digitron on normally?
Check waveform of
IC701 Pin12, 16, 18, 19?
LED ON?
Check waveform
of IC701
Check and Replace
IC703.
Pin25.
when power S/W turn on,
Is oscillation of X701
normal?
Check and Replace C713
Check the connection
of CON701.
Check waveform
of IC701 Pin1, 2.
Does pulse
waveform of RC701 Pin 1
appear?
Is IC701
Pin 49 connected to
RC701 Pin15?
Is RC701 Pin2 5V?
Power on.
Check
-R740 ~ R750
and replace
Check the buttons
Solder defective parts
Replace IC701.
Solder Key part.
Check Power.
Replace IC702.
Replace IC701.
Replace D702.
Replace RC701.
Re-solder.
Recheck
Replace IC701.Complete repairing Front B/D.
NO
NO
NO
NO
NO
NO
NONONO
NO
YES
YES YES
YES
YES YES
YES
YES
YES YES
YES YES
YES YES
YES
YES
YES