LG-DVD2300-cd-sm 维修电路原理图.pdf

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1、1-3CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-TURERS APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLYVOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANYRESULTING PROPERTY DAMAGE OR USER INJURY.SERVICE WORK SHOULD BE PE

2、RFORMED ONLY AFTER YOU ARETHOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETYCHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE,INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THEUSER.WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC-TION FROM A.C. LINE SHOCK.SAFETY CHECKSAFTER THE ORIGI

3、NAL SERVICE PROBLEM HAS BEEN CORRCTED. ACHECK SHOULD BE MADE OF THE FOLLOWING.SUBJECT : FIRE & SHOCK HAZARD1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAYAS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARETRANSPORTED TO AND FROM TH

4、E REPAIR SHOP.2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICESSUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVEBEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THESAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEENDEFEATED.3. SOLDE

5、RING MUST BE INSPECTED TO DISCOVER POSSIBLE COLDSOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS.BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATIONTO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGEDINSULATION (INCLUDING A.C. CORD). AND REPL

6、ACE IF NECESSARYFOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE ORA RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUNDPROTRUNING METAL SURFACES MUST BE AVOIDED.6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOFRESISTORS, CAPACITORS, ETC. MUST B

7、E REPLACED WITH EXACTFACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTSOTHER 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

8、. HAN-DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATEWITHOUT 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, INTHE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-TOR, PARALLELED BY A

9、 .15 MFD. 150.V A.C TYPE CAPACITORBETWEEN 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. PLUGAND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EAC

10、H EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANYVALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCKHAZARD AND MUST BE CORRECTED IMMEDIATELY.SUBJECT: GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHINAN EQUILATERAL TR

11、IANGLE, IS INTENDED TO ALERT THESERVICE 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 TOTHE PRESENCE OF IMPORTANT

12、 SAFETY INFORMATION INSERVICE LITERATURE.SUBJECT : X-RADIATION1. 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 WHENTHE HIGH V

13、OLTAGE 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 SPECI

14、FIED C.R.T. ANODE CONNECTORS MUST BEUSED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD INCOLOR SETS, ALWAYS RE-INSTALL THEM.3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE ANACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF THE METER SHOULD BE CHECKED PERIODICALLYAGAINST A REFERE

15、NCE STANDARD, SUCH AS THE ONE AVAILABLEAT YOUR DISTRIBUTOR.4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLYTHERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERYTIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULDBE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGEWITH A METER TO BE CER

16、TAIN THAT THE HIGH VOLTAGE DOESNOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATINGCORRECTLY, 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

17、ONEACH CUSTOMERS INVOICE.5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS INA PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE ANDTHE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCTLONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCESSIVE VOLTA

18、GE.6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS(WHERE USED).SUBJECT: IMPLOSION1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BETAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOIDS

19、CRATCHING THE TUBE. IF SCRATCHED REPLACE IT.2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.SUBJECT : TIPS ON PROPER INSTALLATION1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TOHEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.2. AVOID COND

20、ITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIOINSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIA-TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REARVENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHTOBSTR

21、UCT 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 ORPLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENTTHICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTO

22、M, BOLTS OR SCREWS USED FOR FASTENERSMUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGETEST ON CUSTOMIZED INSTALLATIONS.5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ONSLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT ISPROPERLY SECURED.6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STAB

23、LE ON ITSMOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSSTHRESHOLDS OR DEEP PILE CARPETS.7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STANDWHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL

24、OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.S OFTHE 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 TOHOME AND FAMILY.PRODUCT SAFETY SERVICI

25、NG GUIDELINES FOR VIDEO PRODUCTSA.C. VOLTMETERGOOD EARTH GROUNDSUCH AS THE WATERPIPE. CONDUIT. ETCPLACE THIS PROBEON EACH EXPOSEDMETAL PARTRadioFans.CN 收音机爱 好者资料库1-4SERVICING PRECAUTIONSCAUTION : Before servicing the DVD player covered by thisservice data and its supplements and addends, read and fo

26、l-low the SAFETY PRECAUTIONS. NOTE : if unforeseen cir-cumstances create conflict between the following servicingprecautions and any of the safety precautions in this publi-cations, always follow the safety precautions.Remembers Safety First:General Servicing Precautions1. Always unplug the DVD play

27、er AC power cord from the ACpower source before:(1)Removing or reinstalling any component, circuit board, module, or any other assembly.(2)Disconnection or reconnecting any internal electricalplug or other electrical connection.(3)Connecting a test substitute in parallel with an elec-trolytic capaci

28、tor.Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may resultin an explosion hazard.2. Do not spray chemicals on or near this DVD player or anyof its assemblies.3. Unless specified otherwise in this service data, cleanelectrical contacts by applying

29、 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, lubricationof contacts is not required.4. Do not defeat any plug/socket B+ voltage interlocks withwhitch instruments covere

30、d by this service manual mightbe equipped.5. Do not apply AC power to this DVD player and/or any ofitselectrical assemblies unless all solid-state device heatsinks are cerrectly installed.6. Always connect test instrument ground lead to theappropriate ground before connection the test instrumentposi

31、tive lead. Always remove the test instrument ground lead last.Insulation Checking ProcedureDisconnect the attachment plug from the AC outlet and turnthe power on. Connect an insulation resistance meter(500V)to the blades of the attachment plug. The insulation resis-tance between each blade of the at

32、tachment 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) DevicesSome semiconductor (solid state) devices can be damagedeasily by static electr

33、icity. Such components commonly arecalled Electrostatically Sensitive (ES) Devices. Examples oftypical ES devices are integrated circuits and some fieldeffect transistors and semiconductor chip components.The following techniques should be used to help reduce theincidence of component damage caused

34、by static electricity.1. Immediately before handling any semiconductor compo-nent or semiconductor-equipped assembly, drain off anyelectrostatic charge on your body by touching a knownearth ground. Alternatively, obtain and wear a commer-cially available discharging wrist strap device, which should

35、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

36、 grounded-tip soldering iron to solder orunsolder ES devices.4. Use only an anti-static solder removal device. Somesolder removal devices not classified a “anti-static” cangenerate electrical charges sufficient to damage ES devices.5. Do not use freon-propelled chemicals. These cangenerate electrica

37、l charge sufficient to damage ESdevices.6. Do not remove a replacement ES device from its protective package until immediately before you are ready toinstall it. (Most replacement ES devices are packaged withleads electrically shorted together by conductive foam,aluminum foil, or comparable conducti

38、ve material).7. Immediately before removing the protective material fromthe leads of a replacement ES device, touch the protectivematerial to the chassis or circuit assembly into which thedevice will be installed.Caution : Be sure no power is applied to the chassis orcircuit, and observe all other s

39、afety 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 liftingof your foot from a carpeted floor can generate static elec-tricity sufficient to damage an ES device.)RadioFans.

40、CN 收音机爱 好者资料库1-5SPECIFICATIONSDVD VIDEO PLAYERPower supply100240V, 50/60HzPower consumtion20WMass3.5kg(7.7lbs) External dimensions430 x 80 x 298 (W x H x D)Signal systemNTSCLaserSemiconductor laser, wavelength 655nm(DVD)/795nm(CD)Frequency range (digital audio)2Hz to 44kHzSignal-to-noise ratio (digi

41、tal audio)More than 105dB (EIAJ)Audio dynamic range (digital audio)More than 95dB (EIAJ)Harmonic distortion(digital audio)0.003%Wow and flutterBelow measurable level (less than +0.001%(W.PEAK) (EIAJ)OperationsTemperature : 5C(41F) to 35C(95F),Operation status : HorizontalOUTPUTSVideo outputs1.0V(p-p

42、), 75, negative sync., RCA jack x 1S video outputs(Y)1.0V(p-p), 75, negative sync.,Mini DIN 4-pin x 1(C)0.286V(p-p), 75Component video output(Y)1.0V(p-p), 75,negative sync., RCA jack x 1(Pb)/(Pr) 0.7V(p-p), 75Audio output(digital audio)0.5V(p-p), 75, RCA jack X 1Audio output(optical audio)Optical co

43、nnector x 1Audio output(analog audio)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.1-6LOCATION OF CUSTOMER CONTROLSopen/closeplaystoppause/stepskipselect/enterslow/scanmenupowerrevfwd11. POWE

44、R/STANDBY BUTTON AND INDICATOR12. DISPLAY WINDOW13. PAUSE/STEP BUTTON14. MENU BUTTON15. SELECT/ENTER BUTTON16. SHUTTLE RING17. ARROW BUTTONS18. SKIP BUTTONS19. STOP BUTTON10. PLAY BUTTON11. DISK TRAY12. OPEN/CLOSE BUTTON1. COAXIAL DIGITAL AUDIO OUT JACK2. COMPONENT VIDEO OUT JACKS3. AUDIO OUT(R/L) J

45、ACKS4. POWER CORD5. S-VIDEO OUT JACK6. VIDEO OUT JACK7. DOLBY DIGITAL AUDIO OUT JACKS8. OPTICAL DIGITAL AUDIO OUT JACKSFRONT PANELDOLBY DIGITAL 5.1CHCOMPONENTVIDEO OUTAUDIOOUTPbPrVIDEOOUTYS-VIDEOOUTLRLRDIGITAL OUTCOAXIALOPTICALCENTERWOOFERFRONTREARREAR PANELFRONT PANELREAR PANEL112 34121110798765823

46、4561-7*TITLE buttonUse the TITLE button to display the title screenincluded on DVD video discs. To operate a menu screen, follow the instructions in “Using a Title Menu”.Display WindowREMOTE CONTROLPOWER buttonDVD/VCR/CATV/TVSelector SwitchPLAY buttonREV SKIP buttonCLEAR buttonFWD/REV SLOW/SCANShutt

47、le Ring*MENU buttonUse the MENU button to display the menu screenincluded on DVD video discs. To operate a menu screen, follow the instructions in “Using a DVDMenu”.*Directional arrow buttons(up, down, left, right) for use in highlighting a selectionon a GUI menu screen, TITLE and MENU screen.FWD bu

48、ttonSTOP buttonOPEN/CLOSE button*ARROW(Volume/Channel)buttonsRETURN(TV INPUT)buttonSOUND(MUTE)buttonPROGRAM buttonMARKER-SEARCH buttonZOOM buttonRANDOM buttonA-B button*MENU button*TITLE buttonsPAUSE/STEP buttonANGLE buttonSUBTITLE buttonAUDIO buttonSETUP buttonREPEAT buttonNUMBER buttonRESUME butto

49、nDISPLAY buttonSELECT/ENTER button1. Title number indicator2. DVD indicator3. CD indicator4. Repeat playback mode indicators5. RANDOM indicator6. Total playing time6. /elapsed time indicator7. Operating status indicator8. Angle icon indicator9. Chapter/Track number indicator1987623452-2DISASSEMBLYCA

50、UTION BEFORE STARTING SERVICINGElectronic parts are susceptible to static electricity and may easily damaged, so do not forget to take aproper grounding treatment as required.Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use amagnetized screw driver i