LG-DVD2300-cd-sm 电路图 维修手册.pdf

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1、1-3 CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- TURERS 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

2、 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 A

3、FTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING. SUBJECT : FIRE 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

4、 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 TH

5、IS 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

6、 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 PE

7、R- 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 HI

8、GHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC- TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR- CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR- ABLE LEVELS. 2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, ALWAY

9、S 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 OPER

10、ATING 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 CORRECTL

11、Y, 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 CUSTOMERS INVOICE. 5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT

12、 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 APPROPRIAT

13、E 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 R

14、EPLACEMENT TUBES. SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY- HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW I

15、S 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 C

16、OMMER- 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

17、 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

18、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

19、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. VOLTMETE

20、R GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC PLACE THIS PROBE ON EACH EXPOSED METAL PART RadioFans.CN 收音机爱 好者资料库 1-4 SERVICING PRECAUTIONS CAUTION : Before servicing the DVD player covered by this service data and its supplements and addends, read and fol- low the SAFETY PRECAUTIONS. NOT

21、E : if unforeseen cir- cumstances create conflict between the following servicing precautions and any of the safety precautions in this publi- cations, always follow the safety precautions. Remembers Safety First: General Servicing Precautions 1. Always unplug the DVD player AC power cord from the A

22、C 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 wron

23、g 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

24、 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

25、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 positi

26、ve 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

27、 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 sta

28、tic 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

29、 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 d

30、evice, 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 a

31、ssembly. 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.

32、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, alu

33、minum 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 cha

34、ssis 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 su

35、fficient to damage an ES device.) RadioFans.CN 收音机爱 好者资料库 1-5 SPECIFICATIONS DVD VIDEO PLAYER Power supply100240V, 50/60Hz Power consumtion20W Mass3.5kg(7.7lbs) External dimensions430 x 80 x 298 (W x H x D) Signal systemNTSC LaserSemiconductor laser, wavelength 655nm(DVD)/795nm(CD) Frequency range (

36、digital audio)2Hz to 44kHz Signal-to-noise ratio (digital 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)

37、, Operation status : Horizontal OUTPUTS Video outputs1.0V(p-p), 75, negative sync., RCA jack x 1 S video outputs(Y)1.0V(p-p), 75, negative sync.,Mini DIN 4-pin x 1 (C)0.286V(p-p), 75 Component video output(Y)1.0V(p-p), 75,negative sync., RCA jack x 1 (Pb)/(Pr) 0.7V(p-p), 75 Audio output(digital audi

38、o)0.5V(p-p), 75, RCA jack X 1 Audio output(optical audio)Optical connector x 1 Audio 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. RadioFans.CN 收音机爱 好者资料库 1-6 LOCATION

39、OF CUSTOMER CONTROLS open/close playstop pause/step skip select/enter slow/scan menu power r e v f w d 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

40、BUTTON 11. DISK TRAY 12. OPEN/CLOSE BUTTON 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 FRONT PANEL DOLBY DIGITAL 5.1CHCOMPONENT VIDEO OUT

41、 AUDIO OUT Pb Pr VIDEO OUT Y S-VIDEO OUT L R L R DIGITAL OUT COAXIAL OPTICAL CENTERWOOFER FRONTREAR REAR PANEL FRONT PANELREAR PANEL 1 12 34 121110798 7658 23456 1-7 *TITLE button Use the TITLE button to display the title screen included on DVD video discs. To operate a menu screen, follow the instr

42、uctions in “Using a Title Menu”. Display Window REMOTE CONTROL POWER button DVD/VCR/CATV/TV Selector Switch PLAY button REV SKIP button CLEAR 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, follo

43、w the instructions in “Using a DVD Menu”. *Directional arrow buttons (up, down, left, right) for use in highlighting a selection on a GUI menu screen, TITLE and MENU screen. FWD button STOP button OPEN/CLOSE button *ARROW(Volume/Channel)buttons RETURN(TV INPUT)button SOUND(MUTE)button PROGRAM button

44、 MARKER-SEARCH button ZOOM button RANDOM button A-B button *MENU button *TITLE buttons PAUSE/STEP button ANGLE button SUBTITLE button AUDIO button SETUP button REPEAT button NUMBER button RESUME button DISPLAY button SELECT/ENTER button 1. Title number indicator 2. DVD indicator 3. CD indicator 4. R

45、epeat playback mode indicators 5. RANDOM indicator 6. Total playing time 6. /elapsed time indicator 7. Operating status indicator 8. Angle icon indicator 9. Chapter/Track number indicator 1 9876 2345 2-2 DISASSEMBLY CAUTION BEFORE STARTING SERVICING Electronic parts are susceptible to static electri

46、city 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 ca

47、utions. 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 Tray Front Panel Stopper St

48、opper (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)

49、 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 shortcircui