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PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
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 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 PROTECTION FROM A.C. LINE SHOCK. 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 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 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 A FACTOR, 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 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 HAZARDS 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 SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.
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 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. A.C. VOLTMETER
GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC
PLACE THIS PROBE ON EACH EXPOSED METAL PART
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 MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.
1-3
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 electrolytic 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 i t s 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.)
1-4
SPECIFICATIONS
DVD VIDEO PLAYER Power supply Power consumtion Mass External dimensions Signal system Laser Frequency range (digital audio) Signal-to-noise ratio (digital audio) Audio dynamic range (digital audio) Harmonic distortion(digital audio) Wow and flutter Operations 100~240V, 50/60Hz 20W 3.5kg(7.7lbs) 430 x 80 x 298 (W x H x D) NTSC Semiconductor laser, wavelength 655nm(DVD)/795nm(CD) 2Hz to 44kHz More than 105dB (EIAJ) More than 95dB (EIAJ) 0.003% Below measurable level (less than +0.001%(W.PEAK)) (EIAJ) Temperature : 5°C(41°F) to 35°C(95°F), Operation status : Horizontal
OUTPUTS Video outputs S video outputs Component video output Audio output(digital audio) Audio output(optical audio) Audio output(analog audio) 1.0V(p-p), 75, negative sync., RCA jack x 1 (Y)1.0V(p-p), 75, negative sync.,Mini DIN 4-pin x 1 (C)0.286V(p-p), 75 (Y)1.0V(p-p), 75,negative sync., RCA jack x 1 (Pb)/(Pr) 0.7V(p-p), 75 0.5V(p-p), 75, RCA jack X 1 Optical connector x 1 2.0Vrms (1kHz, 0dB), 330, RCA jack (L, R) x 1
*Designs and specifications are subject to change without notice. *Weight and dimensions shown are approximate.
1-5
LOCATION OF CUSTOMER CONTROLS
F R O N T PA N E L
1
power open/close
2
3 4 5
rev
pause/step menu select/enter
6
slow/scan
d fw
play
stop
skip
12
11
10 9
8
7
R E A R PA N E L
1
DOLBY DIGITAL 5.1CH FRONT REAR
2 3
COMPONENT VIDEO OUT AUDIO OUT
4
L
Pb
L
R
DIGITAL OUT
Pr
R
S-VIDEO OUT
COAXIAL OPTICAL
CENTER
WOOFER
Y
VIDEO OUT
8
7
6
5
F R O N T PA N E L
11. POWER/STANDBY BUTTON AND INDICATOR 12. DISPLAY WINDOW 13. PAUSE/STEP BUTTON 14. MENU BUTTON 15. SELECT/ENTER BUTTON 16. SHUTTLE RING 17. ARROW BUTTONS 18. SKIP BUTTONS 19. STOP BUTTON 10. PLAY BUTTON 11. DISK TRAY 12. OPEN/CLOSE BUTTON
R E A R PA N E L
1. COAXIAL DIGITAL AUDIO OUT JACK 2. COMPONENT VIDEO OUT JACKS 3. AUDIO OUT(R/L) JACKS 4. POWER CORD 5. S-VIDEO OUT JACK 6. VIDEO OUT JACK 7. DOLBY DIGITAL AUDIO OUT JACKS 8. OPTICAL DIGITAL AUDIO OUT JACKS
1-6
Display Window
1 2 3 4 5
9
1. Title number indicator 2. DVD indicator 3. CD indicator 4. Repeat playback mode indicators 5. RANDOM indicator
8
7
6
6. Total playing time 6. /elapsed time indicator 7. Operating status indicator 8. Angle icon indicator 9. Chapter/Track number indicator
REMOTE CONTROL
POWER button PLAY button REV SKIP button PAUSE/STEP button SELECT/ENTER button RESUME button DISPLAY button NUMBER button CLEAR button ANGLE button SUBTITLE button AUDIO button SETUP button REPEAT button
DVD/VCR/CATV/TV Selector Switch FWD button STOP button OPEN/CLOSE button **ARROW(Volume/Channel) buttons RETURN(TV INPUT) button SOUND(MUTE) button PROGRAM button *MENU button ***TITLE buttons MARKER-SEARCH button ZOOM button RANDOM button A-B button FWD/REV SLOW/SCAN Shuttle Ring
*MENU button
Use the MENU button to display the menu screen included on DVD video discs. To operate a menu screen, follow the instructions in "Using a DVD Menu".
***TITLE button
Use the TITLE button to display the title screen included on DVD video discs. To operate a menu screen, follow the instructions in "Using a Title Menu".
**Directional arrow buttons
(up, down, left, right) for use in highlighting a selection on a GUI menu screen, TITLE and MENU screen.
1-7
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.
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
Top Case
(A) (A) (A) (A) (A)
3. Front Panel
1. 2. 3. 4. Eject the disc tray. (See Fig. 2-2) Remove the tray door. (See Fig. 2-2) Release 2 screws (B). Pull the front panel toward you while pressing 7 stoppers to disengage, and remove the front panel. (See Fig. 2-3)
(A) (A)
(B)
(B)
Stopper
Stopper Front Panel
Fig. 2-1 Fig. 2-3
2. Tray Door
1.Eject the disc tray. 2.Lift up the tray door in the direction of the arrow.
Tray Door
Disc Tray
Fig. 2-2 2-2
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)
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.
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.
(C) (C) A/V Circuit Board (C) (C) Main Circuit Board Flexible connector (C)
(C)
Key Circuit Board
(E) (E) (E) (E) (E) (E)
Digitron Circuit Board
Fig. 2-6
Flexible connector (C) (C) (C) (C)
Fig. 2-4
2. Power Circuit Board
1. Relrase 4 screws(D). (See Fig. 2-5)
Power Code (D) (D) Power Circuit Board (D) (D)
Fig. 2-5 2-3
1
463
2
PBJ00
3
4
5 1. Cabinet and Main Frame Section
A
250 462 462 462
A00
B
452
260
EXPLODED VIEWS
462
462
2-4
452
PB
463
K0
283
463 452 300 455 463 463
0
PB T0 0
A47
463 463
463
C
277 278
A48
280
PB S0 0
463
A46
A43
D
2.Packing Accessory Section
806 CABLE
808 BATTERY
811 812
900 REMOCON
813 801 OWNER'S MANUAL
804 PACKING SHEET 803 PACKING 803 PACKING
802 BOX CARTONX
3.Remote Control Section
905 902 903 904
906
909
908
907
901
900
2-5
ELECTRICAL TROUBLESHOOTING GUIDE
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.)
START
Is F901 normal? Check the GND of C901 and IC901 Pin 3 with oscilloscope. NO When IC901 oscillating YES
NO A primary side is abnormal.
Is voltage of BD901 140V? YES
NO
Is IC901 Pin 3 NO Is IC905 switching normally? normal? In condition of DC140V. YES YES (Feedback is abnormal) NO Check or replace D908.
Are R907, D902, D903 and R902 normal? YES
NO
Does oscillate continuously when the CON903 is disconnected ? YES Secondary side is abnormal. Front Circuit Board is abnormal Are D908, D909, D907, D910, D906 and D905 normal? YES NO Replace Q908 and Q909. NO Is CON903 Pin 3 5.2V? YES NO
Is CN903 Pin 3 5.2V? YES
Are D901, R904, R905 and R906 normal? YES
NO
After connect CON903 Pin 1 , 3 short. (A)
Are R922, C927, R921 and R918 normal?
NO Is PC901 normal? YES END
NO
Are CON902 Pin 5 , 6 and 9 5V? YES Replace defective parts. Is CON904 Pin 3 8V? YES
Replace IC902. NO
Is CON902 Pin 3 12V? YES
Replace defective parts.
Check Q904 and ZD903.
To (A).
Are CON903 Pin 5 -24V, Pin 7 -20V and Pin 8 -16V? YES
NO
(Fig. 3-1) IC901 Pin 3
END Normal switching waveform on the stand-by mode at the AC110V
3-2
2. µ-COM Circuit
A. No Power
POWER ON
Power RED LED on?
NO
Refer to Front Part.
YES
Does Bar appear at FLD?
NO
YES
Do all five Bars appear?
NO
Is CON107 connected normally?
YES
NO Reconnect it.
Does Logo appear on the screen? YES
NO
Check power. (Refer to power) If power is normal
OK
NO
Is CON107 Pin6 normal? YES A
1
Refer to Front Part
1
Is oscillation of X101 normal? YES
NO
Check the oscillation
NO
The waveform on A[00:21] and D[00:15] of IC108 normal? YES
Check short Are IC107 Pin 14 , 28 and 29 normal? YES NO
Check short. OK
NO
Are IC101 Pin 7 , 8 normal? YES
A
Replace IC107 or IC108.
Replace IC101.
Replace Main B/D.
3-3
B. Audio abnormal
AUDIO ABNORMAL
C. Video abnormal
VIDEO ABNORMAL
Check Audio jack. YES (If OK) Check PLL FC of MPEG part. YES (If OK) Refer to Audio part. YES (If OK) Refer to MPEG part. YES (If OK) Replace B/D.
Check Video jack. YES (If OK) Refer to Video part. YES (If OK) Refer to Encoder part. YES (If OK) Refer to MPEG part. YES (If OK) Replace B/D.
D. Open/Close abnormal
OPEN/CLOSE ABNORMAL
Check Front. YES (If OK) Check the connection of CON107. NO
Reconnect it.
YES NO
Check the connection of MD.
Check IC101 Pin 13 , 14.
YES Refer to SERVO part.
YES
3-4
E. Picture abnormal
PICTURE ABNORMAL
Check the disc.
Refer to Servo part If OK Check PLL IC of MPEG part YES (If OK) Check DSP YES (If OK) Check MPEG YES (If OK) Replace B/D
F. Disc Error
DISC ERROR
Check Disc YES (If OK) Refer to Servo part YES (If OK) Replace B/D
3-5
3. MPEG Circuit
Power is on
Does LG Logo appear on the screen? YES Does the moving picture of the DVD Disc play on the screen normally? YES
NO
Check power & clock. YES
A
NO
Is MPEG data signal normal? YES
NO
Check CD/DVD DSP output signal. OK
B
OK
Check MPEG Decoder input signal.
C
YES
Is error signal normal?
NO
Check CD/DVD DSP output signal. OK
D
Check MPEG Decoder input signal.
E
Does the moving picture of the video CD play on the screen normally? YES
NO
Is MPEG data signal normal? YES
NO
Check CD/DVD DSP output signal. OK
F
_ OPTION _ If included VCD function.
Check MPEG Decoder input signal.
G
Is Clock normal? YES
NO Check clock signal H
Does the audio sound output normally? YES END
NO
Does the audio sound output from MPEG decoder? YES
Check clock signal
I
3-6
4. Front Circuit (Digitron & key)
START
Power on.
LED ON? YES
NO
Is oscillation of X501 normal? YES
NO
Check Power.
Is Digitron on normally? YES
NO
Check waveform of IC500 Pin 6 . YES
NO
Replace IC501.
CD
Do all the buttons work normally? YES
NO
Is waveform of IC500 Pin78 normal? YES
NO
Check waveform of IC500 Pin13 . YES
NO
Solder Key part.
Check waveform of IC500 Pin13 . YES
NO
Replace IC500.
Solder defective parts again
Check waveform of Q500 Pin 2 . YES
NO
Replace Q500.
Check and replace R516, R507, R506, R500, R505, R504, R512 and R503.
Replace LED501.
Does remote control work normally? YES
NO
Does pulse waveform of RE500 Pin 3 appear? YES
NO Is RE500 Pin 2 5V? YES
NO Solder defective parts
Is IC500 Pin24 connected to RE500 Pin 3 ? YES
Replace RE500 YES
Complete repairing Front B/D.
Replace IC500. YES
Re-solder. YES Recheck
3-7
5. RF/Servo Circuit
A.
CHECK POINT(General)
Does signal goes "High" to IC206 Pin194 when the power is on? YES
NO
Does signal pulse input to IC206 Pin 58 , 59 when the powe is on? YES
NO
Check "2.µ-COM Part".
Does TTL pulse output to IC206 Pin14, 14? YES
NO
Does 33.8688MHz clock input to IC206 Pin 63? YES
NO
Replace X301 or IC308(30MHz clock defect)
Replace IC206 (IC206 soldering or IC defect).
Is IC206 Pin83, 84, 88, 89 voltage about 2.2V? YES
NO
Replace IC700 (IC700 soldering or IC defect)
END
3-8
B.
No disc
Power on
Check loading Part.
Does tray open or close?
NO
Push Pick-up to inner track to the end by hand.
YES Does CON202 Pin17 change high to low? YES Pressing the open/close key repeatedly, check the voltage of CON202 Pin 9 change 0V to 5V YES Junction Board Does the voltage change at IC401 Pin 15 , 16 more than 2V on the basis of 4.5V? YES NO Replace IC401.
NO
DECK assembly is defective. (Limit sw)
NO
check µ-COM Part.
DECK assembly is defective. Fig.1. SLED Driver waveform
Does the pick-up slide inner or outer track? YES
NO
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
Fig.2. Focus Driver waveform NO Check Focus Driver output. (IC206 Pin 83, IC401 Pins 11,12) IC206 Pin 83 no output : IC700 is defective IC401 Pin 1 , 2 no output : IC701 is defective
Does the pick-up lens move up and down? YES Slide the pick-up to inner track.
END
3-9
C.
DISC IN
OPEN/CLOSE
Fig.3. FOCUS ERROR waveform NO FOCUS ON? YES
Check the focus error moving the lens up and down. (IC201 Pin 21)
NO
Check IC201 Pin 52 , 53 , 54 , 55 in DVD Mode Check IC201 Pin 58 , 59 , 60 , 61 in CD Mode IC201 no output : Pick-up is defective.
YES
Does the TTL level change at IC206 Pin 78 and 13 moving the lens?
NO Replace IC206.
YES
Replace µ-COM or IC206.
NO Does the disc turn? YES
Check CON404 Pin4, 6 Motor turn when the Pin4 is less than 1.6V
Check IC206 and IC403 when the Pin 4 is abnormal
NO IC206 Pin16 is "High"? YES Check A
Is OK the track jump. YES
NO
Does the signal pulse input at IC700 Pin 27, 28 , and 29? YES
NO
µ-COM part is defective. Check "2.µ-COM Circuit."
NO Does the screen appear? YES
Video Par is defective. Check "5.MPEG Circuit." Check "7.OSD/Video Circuit."
Replace IC700.
END
3-10
D.
CHECK A
Fig.5. RF waveform Check RF Eye-Pattern. RF : 1.0-2.1V(IC201 Pin 28) YES NO
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
NO Is the eye-pattern vivid? YES
Does the sawtooth waveform emit at IC201 Pin 20 ? YES
NO Does the 1.6V emit? YES
NO Replace IC201.
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
END
3-11
1. Overall Block Diagram
BLOCK DIAGRAMS
DISC DVD_LDQM, DVD_SD_CS1 RFRP, RFCen, TE, Vref DVD : A, B, C, D DVD : RF CD : A, B, E, F SPINDLE MOTOR IC201 TA1254F RF SIGNAL PROCESSOR Comp.
DRAM 256K x 16bit
IC307 GM72V1621 1M x 16bit SDRAM
DVD_MA[0:11] DVD_MD[0:15]
ICDATA[00:15]
ICADDR[0:8]
M
PICK UP
FE, TE, RFRP, SBADD, DVD/CD RF TEBAL, FEBAL, DPOCTL, EQF, EQB
focus, tracking sled
LOADING MOTOR
spindle Loading
MON, SPINDLE_DRV
IC306 GM72V1621 1M X 16bit SDRAM
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 DVD_SD_CS0, DVD_UDQM
M
OPEN S/W CLOSE S/W LIMIT S/W DECK MECHANISM
IC400 BA6859FP SPINDLE MOTOR DRIVER
IC401 BA5983 POWER DRIVER
FDO,TDO, FMO
IC206 DVDSP-3301 CD/DVD DSP DVD SERVO
SPINDLE_FG, SLD_FG
-22.5V -27V -21.8V AC 100 ~240V, 50 ~60Hz
LOADING DRIVE
SENS, FOK, SLD_FG, MSDAT0,DEFECT,DSP_SENSE, SQSO, SQCK, SCOR, AO[0:5] XLAT, S_CLK, S_DATA, DO[0:7] D[00:07] A[00:02] S_CLK, S_DATA, DPLL_L IIC_DATA, IIC_CLK
IC301 ZiVA-3 MPEG A/V Decoder
POWER BOARD
27MHz
Hsync
+5VA +5VD +5VU AGND,GND,UGND
IC108 SH7034
POWER CONTROL
IC308 PLL1700 CLOCK GENERATROR
27MHz X-TAL
DA_DATA, DA_LRCK, DA_BCK
IC800/IC801 BT865A/861A NTSC/PAL Encoder Composite, Y, C
Vsync
+9V
VDATA[0:7]
FLASH MEMORY
L
R
Composite
3-12
FL DISPLAY
Component
IC500 LC866112
RXDO/TXDO/SCKO F_Reg/M_Reg/M_Reset/MD_SW REMOCON RECEIVER
DRAM
DAC_L0, S_CLK S_DATA
IC703/IC601~603 PCM176x4 AUDIO DAC
L R AMP FILTER Y C Y FILTER Pr Pb
KEY INPUT
AUDIO OUT
VIDEO OUT
2. Power(SMPS) Block Diagram
F+ FRECTIFIER(FLD) -24V
RECTIFIER(14V)
LPF
12V
RECTIFIER
TRANS
SWITCHING IC
RECTIFIER(10V)
LPF
REG(8V)
8V
3-13
RECTIFIER(5.2V) LINE FILTER
LPF
D5V A5V
FEED B.
U5V
PWR ON/OFF
AC85~135V
3. RF/CD DSP/DVD DSP/DVD SERVO Block Diagram
RFRP, RFCen, 4 TE, Vref
2
MIRR,TZC SENS, FOK, SLD_FG, MSDATO, DEFECT, DSP_SENSE SQSO, SQCK, SCOR XLAT,S_CLK, S_DATA
Comp.
DVD : A,B,C,D 4 RFZ_HOLD 5 3 4 FE,TE,RFRP,SBADD 4 3
PICK UP
DVD : RF CD : A, B, E,F
UCOM I/F
IC201 TA1254F RF Signal Processor
DVD/CD RF 5 TEBAL, FEBAL, DPOCTL, EQF, EQB
IC206 DVDSP-3301 CD / DVD DSP DVD SERVO
8 4 8
DO[0:7] AO[0:5] ZO[0:7]
UCOM I/F MPEG I/F
ICADDR[0:8] 9
ICDATA[00:15]
16
3-14
MON, SPINDLE_DRV FDO, TDO, FMO spindle
MCK
MPEG I/F
IC400 BAS6859FP Spindle Motor Driver
focus, tracking, loading, sled
IC400 BA5983 Power Driver
DRAM 256K x 16bit
M/D
SPINDLE_FG, SLD_FG loading drive
UCOM I/F
4. Audio Block Diagram
MPEG_RST
U-com I/F (IC108)
S_DATA S_CLK DAC_L0 DA_LRCK DA_BCK DA_XCK DA_DATA0
IC703 PCM1716 Audio DAC
L0 R0
IC704 LPF & Buffer NJM4580M OP AMP
Lt Rt
CH 1/2 : DOWNMIX Lt / Rt
DA_DATA1
7
MPEG I/F (IC301)
IC601 PCM1716 Audio DAC
CH 3/4 : FRONT L/R
L1 R1
IC604 LPF & Buffer
FL FR
3-15
TO A/V BOARD
L2 R2
DA_DATA2
7
IC602 PCM1716 Audio DAC
CH 5/6 : REAR L/R
IC605 LPF & Buffer
RL RR
DA_DATA3
7
IC603 PCM1716 Audio DAC
L3 R3
IC606 LPF & Buffer
WOOFER CENTER
5. MPEG Block Diagram
DVD_DATA[0:7]
8 2
4
DA_DATA[0:3] DA_BCK SPDIF
DSP I/F
SDCLK1,ZISENB REQZ1
AUDIO I/F
A[00:02]
3 8
IC301 ZiVA-3 MPEG A/V Decoder
Y HSYNC, VSYNC VDATA[0:7] DA_XCK MPEG_CLK 2 8 Pb Pr COMPOSITE1 Y/C
UCOM I/F
3-16
D[00:07] MPEG_ERROR
IC800/IC801 BT865A/861A NTSC/PAL Encoder
VIDEO I/F
IIC_DATA, IIC_CLK
2
DVD_SD_CS0, DVD_UDOM 2 DVD_MD[0:15] DVD_MA[0:11] 4 DVD_SD_CAS DVD_SD_RAS DVD_SD_CLK DVD_MWE
16
12
2 DVD_LDOM, DVD_SD_CSI
IC306 GM72V1621 1M x 16bit SDRAM
IC307 GM72V1621 1M x 16bit SDRAM
IC308 PLL1700 CLOCK GENERATROR
27MHz X-TAL
S_CLK, S_DATA, DPLL_L
UCOM I/F SERVO I/F
MCK
6. µ-COM Block Diagram
BCA_CODE SPINDLE_FG, SLD_FG,
SERVO I/F DSP I/F
MPEG I/F
D[00:07], A[00:02], IIC_CLK, IIC_DATA, SCLK0, MPEG_INT
D[00:07], A[00:05], E_SIN, E_CLK LOAD FR, F/R, LOCK, DEFECT, FOK, DSP_SENSE
MPEG_ERROR, DAC_L0, RF_LAT, /DSP_CS, /MPEG_CS, /PP_CS 6
IC114 EEPROM AT24C02
SENS_MCOM, MICOM_WAIT 2
IIC_CLK, IIC_DATA
2 8 D[00:07] 8
IC102 74HC374
IC101 XC9536
8 PWR_CTL, SENS, LIMIT_SW, MIC_ON, CLOSE_SW, OPEN_SW, MPEG_WAIT, ZIERR
/IOCSI, /WR 2
A[19:21] D[00:04]
2 2
IC108 SH7034
EXP_W2, /PWR_CLT A[01:21] 21 16 D[00:15] 2
MPEG_CTL, E_DR, /ZOOM_RST, /S_XRST, XLAT, ACT_MUTE, V_MUTE, A_MUTE
3-17
FRONT I/F
16 MICOM_RESET A[01:19] 19
D[00:15] A[01:09] 9
16
D[00:15]
IC106 ROM 512K x 16
IC107 DRAM 256K x 16
CIRCUIT DIAGRAM
1. POWER(SMPS) CIRCUIT DIAGRAM
IMPORTANT SAFETY NOTICE WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTETED WITHOUT PERMISSION FROM THE ZENITH ELECTRONICS CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGI-
NAL CIRCUIT SPECIAL COMPONTS ARE SHADED ON NOTE : THE SCHEMATIC FOR EASY IDENTIFICATION. 1. Shaded( ) parts are critical for safety. Replace only THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFwith specified part number. FER FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED.
IC902 is defective. 8V Power Line dead.
Q908, R928, D913 and Q909 are defective. 5V Power Line dead.
IC903 PIN3 (AC110V, PLAY)
IC901 PIN3 (AC110V, STAND-BY)
Q901 and Q902 are defective. FLD(+), FLD(-) are dead.
IC901 is defective. Power dead.
C927, R918, R922 and IC905 are defective. Power dead.
Q903, Q904 are defective. Power control is abnormal.
NOTES) NOTES) NOTES) NOTES)
Warning Parts that are shaded are critical With respect to risk of fire or electricial shock.
3-18
3-19
2. RF & DVD DSP CIRCUIT DIAGRAM
Q202 is defective. DVD LD will not be on. IC204 is defective being slipped during search.
IC209 is defective AD Converter Error
TZC Mirr. Generator
AD Ref. Voltage Gen
RF/TE/FE Signal generation
Q203 is defective CD LD will not be on
Digital Servo DSP/ CD Decoder
Spindle Low Pass Filter
DRAM
3.3V Regulator
IC219 is defective Servo will not operate
IC403 is defective No Spindle Full Speed
T.E F.E
R.F TRACKING LOOP
FOCUS LOOP SLED LOOP
SPINDLE LOOP
3-20
3-21
3. DRIVE CIRCUIT DIAGRAM
SPINDLE
MOTOR DRIVE
SPINDLE TRACKING DOOR
FOCUS SLIED
3-22
3-23
4. MPEG & ENCODER CIRCUIT DIAGRAM
2 1 3 4 6 7 8 9 10 11 12 13
No power on 3.3V Reg.
5
No power on No power on µ-com->MPEG address
ROM
VIDEO ENCODER
14 15
The screen is distorted(DVD) Over 3V->Data error. GND:OK No VCD screen display(option). No CD sound out. No DVD screen display
16
Over 3V->Data error. GND:OK (CD/VCD option) No power on No Audio(check clock)
MPEG2 DECODER
No 5.1CH Audio
18
No 2CH Audio Audio signal doesn't appear No screen No power on µ-com->MPEG command data No power on over 3V: normal
19 20 21 17 25 22
16M SDRAM 16M SDRAM VIDEO ENCODER
No power on Check 89MHz Video Mute doesn't operate in power on/off No Pb output No Pr output No Y output
23
24
No composite video output No Luminance output in Y/C Video No Chrominance output in Y/C Video No power on No power on
CLOCK
VIDEO
26
3-24
3-25
5. AUDIO CIRCUIT DIAGRAM
IC712, 713 are defective Audio bad
Q601 is defective 5.1CH FL/FR Audio out bad IC704 is defective 2CH Audio out bad Q705 is defective 2CH Audio out bad
IC604 is defective 5.1CH FL/FR Audio out bad
IC705,706,707 are defective Audio POP noise or 2CH Audio out bad
Q703,704 are defective Headphone output bad
IC703 is defective 2CH Audio out bad
OPTION
AUDIO DAC
OPTION
IC708 is defective Mic input bad IC601 is defective 5.1CH FL/FR Audio out bad IC602 is defective 5.1CH RL/RR Audio out bad
AUDIO DAC
ADC
IC605 is defective 5.1CH RL/RR Audio out bad
AUDIO DAC
IC710,711 are defective Digital Data out bad
IC603 is defective 5.1CH woofer/center Audio out bad
AUDIO DAC
IC709, 702 are defective Audio pop noise or Audio output bad
IC606 is defective 5.1CH woofer/center Audio out bad
AUDIO DIGITAL DATA INPUT CLOCK DIGITAL DATA OUT
AUDIO 2CH R OUT AUDIO 2CH L OUT AUDIO 5.1 CH FR / RR OUT AUDIO 5.1 CH FL / RL OUT
AUDIO 5.1CH CENTER OUT AUDIO 5.1CH WOOFER OUT
IC607,608,609,610,611,612 are defective Audio pop noise or 5.1CH Audio out bad
3-28
3-29
6. µ-COM/EXPANDER CIRCUIT DIAGRAM
Servo will not operate
OPTION(DIVX)
AT49F8192A-90TC/AM29F800BB
FLASH ROM
GM71C4260CJ60
SDRAM
R197 OPEN
BCA DECODER
E X P A N D E R
D[00:15] ; FLD Error A[00:21] ;FLD Error
MAIN CPU
Video output level is unstable
MUX
X101; No Power on Audio output is unstable Servo will not operate
EEPROM
OPEN, Close Error
3-30
3-31
7. FRONT(TIMER) & KEY CIRCUIT DIAGRAM
SW509 is defective Direction Key is defect DIG501 is defective FLD is distorted
4 Direction S/W
ENTER
SFUTTLE
FRONT CONTROL RESET
JS500 is defective SCAN +/- wll not operate
RE500 is defective R/C receiver Error IC501 is defective Reset Error
Remocon Receiver
OPEN/CLOSE POWER
Q500 is defective LED will not operate
3-32
3-33
8. JACK CIRCUIT DIAGRAM
EXT/DVD can't be changed
16:9 can't be changed
Scart Mode can't be changed
OPTICAL COMP.VIDEO S VIDEO (Y)
S VIDEO (C) AUDIO (L) AUDIO (R)
3-34
3-35