LG-DK855-cd-sm 电路图 维修手册.pdf

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1、DVD-VIDEO PLAYER SERVICE MANUAL MODEL: DK867/DK855/DK854/DV840 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETYPRECAUTIONS” IN THIS MANUAL. MODEL: DK867/DK855/DK854/DV840SERVICE MANUAL P/NO : AFN35874449 DECEMBER,2007 Website Internal Use Only RadioFans.CN 收音机爱 好者资料库 Copyright 2008 LG Electronics

2、. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only CONTENTS SECTION 1.SUMMARY SECTION 2.CABINET & MAIN CHASSIS SECTION 3.ELECTRICAL SECTION 4.MECHANISM (DP-12V) SECTION 5.REPLACEMENT PARTS LIST RadioFans.CN 收音机爱 好者资料库 SECTION 1 SUMMARY CONTENTS 1-2 Copyright 2008

3、 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS.1-3 SERVICING PRECAUTIONS.1-4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE (ES) DEVICES THE PROCESS O

4、F DISC DOWNLOAD.1-5 SPECIFICATIONS.1-7 RadioFans.CN 收音机爱 好者资料库 1-3 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS IMPORTANT SAFETYNOTICE This manual was prepared for use only by

5、 properly trained audio-video service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their phys

6、ical location, wiring and lead dress must conform to original layout upon completion of repairs. Special components are also used to prevent x-radiation, shock and fire hazard. These components are indicated by the letter “x” included in their component designators and are required to maintain safe

7、performance. No deviations are allowed without prior approval by LG Corporation. Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set are not delayed until the new service literature is p

8、rinted. CAUTION: Do not attempt to modify this product in any way. Never perform customized installations without manufacturers approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. Service work should be performed only after you are th

9、oroughly familiar with these safety checks and servicing guidelines. GRAPHIC SYMBOLS The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature. The lightning flash with arrowhead symbol within an equilate

10、ral triangle is intended to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magnitude to constitute a risk of electric shock. The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the se

11、rvice personnel the following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALLFUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE. SERVICE INFORMATION While servicing, use an isolation transformer for protection from AC line shock. After t

12、he original service problem has been corrected, make a check of the following: FIRE AND SHOCK HAZARD 1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop. 2. Verify that all p

13、rotective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the 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

14、 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 or damaged insulation (including the AC cord), and replace if necessary. 5. No lead or c

15、omponent should touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided. 6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna termin

16、als, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOTUSE ALINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a

17、.15 mfd 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC volt

18、age measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately. TIPS ON PROPER INSTALLATION 1. Never install any receiver in a

19、 closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a 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 placeme

20、nt where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation. 4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. Aproduct mounted

21、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 tests on customized installations. 5. Caution customers against mountin

22、g a product on a sloping shelf or in a tilted position, unless the receiver is properly secured. 6. Aproduct on a roll-about cart should be stable in 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. C

23、aution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family. 1-4 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SERVIC

24、ING PRECAUTIONS CAUTION: Before servicing the DVD 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 publication,

25、 always follow the safety precautions. Remember Safety First : General Servicing Precautions 1.Always unplug the DVD AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any internal

26、 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 D

27、VD 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, lub

28、rication of contacts is not required. 4.Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped. 5.Do not apply AC power to this DVD and / or any of its electrical assemblies unless all solid state device heat sinks are correctly in

29、stalled. 6.Always connect the test instrument ground lead to an appropriate ground before connecting 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 a

30、n 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 include Metal panels, Input terminals, Earphone jacks

31、,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

32、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 t

33、ouching 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 assemb

34、ly 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 as “anti-stati

35、c” can generate electrical charges sufficient to damage ES devices. 5.Do not use freon-propelled chemicals. These can generate an electrical charge sufficient to damage ES devices. 6.Do not remove a replacement ES device from its protective package until immediately before you are ready to install i

36、t. (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 o

37、r 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

38、your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.) 1-5 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only THE PROCESS OF DISC DOWNLOAD Please follo

39、w the below process to download a program with disc 1. Turn on the DVD-player. (Note. Be sure that there is no disc in DVD-player) 2. Press “SETUP” button on Remote control. 3. Choose a “display” menu by using the cursor button and then choose a “TV Aspect” menu. And choose “16:9” menu. 4. Press the

40、 1 - 3 - 9 - 7 - 1 - 3 - 9(numerical button) - Enter key on remote control to confirm the system information. 5. Remember or write the model name. 6. Change the program file name of new version to the model name Ex New ver. program file-LG_DV_LV80F7FC10EMSMIS_V014.ROM Model name - LG_DV_LV81F7FC00EM

41、S Change New ver. program file like this - LG_DV_LV81F7FC00EMSMIS.ROM (NOTICE) You must add “MIS” at the end of model name If you don”t change the file name like that, Disc download isn”t be worked. 7. Copy the changed file to a disc. 8. Insert the copied disc to DVD-player. 9. If the below picture

42、appears on the screen, Press “” key. 10.After the below picture appears on the screen, Disc will emerge from DVD-player automatically. Take the disc out of the DVD-player. 11.After Disc download is completed, DVD-player turns off and then turns on automatically. 12.Do it again the process 1, 2, 3, 4

43、 to confirm the version. 1-6 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1-7 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SPECIFICATIONS GENERAL Power requ

44、irements AC 110V 240V, 50/60Hz Power consumption 8W Dimensions (Approx.) 360 x 35 x 195mm (W x H x D) without foot Net Weight (Approx.) 2.3kg Operating temperature: 5C to 35C Operating humidity 5% to 90% Laser Semiconductor laser Signal system PAL / NTSC OUTPUTS Video Output 1.0V (p-p), 75, sync neg

45、ative, RCA jack x 1 Component Video Output (Y) 1.0V (p-p), 75, sync negative, RCA jack x 1 (Pb)/(Pr) 0.7V (p-p), 75, RCA jack x 2 Audio Output 2.0Vrms (1kHz, 0dB), 600, RCA jack (L, R) x 1 / Digital Output (Coaxial) 0.5V (p-p), 75, RCA jack x 1 1-8 Copyright 2008 LG Electronics. Inc. All right reser

46、ved. Only for training and service purposes LGE Internal Use Only MEMO 2-1 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS.2-2 1. CABINET AND MAIN FRAME SECTION.2-2 2. DECK MECHANISM SECTION (DP-12V).2-3 3. PACKING ACCESSORY SECTION.2-4 OPTIONAL PARTS A D A C B 460 460 462 460 250 462 462 A46 P101 A47 300 C B 462 A26 283 467 A48 MAIN SMPS 5.1CH SCART 276 463 KARAOKE & USB A43 280 279 KEY CN903 452 D A49 CABLE1 TIMER 452 452 462 A44 261