LG-DK855-cd-sm 维修电路原理图.pdf

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1、DVD-VIDEO PLAYERSERVICE MANUALMODEL: DK867/DK855/DK854/DV840CAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETYPRECAUTIONS”IN THIS MANUAL.MODEL: DK867/DK855/DK854/DV840SERVICE MANUALP/NO : AFN35874449 DECEMBER,2007Website http:/Internal Use OnlyRadioFans.CN 收音机爱 好者资料库Copyright 2008 LG Electronics. In

2、c. All right reserved.Only for training and service purposesLGE Internal Use OnlyCONTENTSSECTION 1.SUMMARYSECTION 2.CABINET & MAIN CHASSISSECTION 3.ELECTRICALSECTION 4.MECHANISM (DP-12V)SECTION 5.REPLACEMENT PARTS LISTRadioFans.CN 收音机爱 好者资料库SECTION 1SUMMARYCONTENTS1-2Copyright 2008 LG Electronics. I

3、nc. All right reserved.Only for training and service purposesLGE Internal Use OnlyPRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS.1-3SERVICING PRECAUTIONS.1-4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE (ES) DEVICESTHE PROCESS OF DISC DOWNLOAD.1-5SPEC

4、IFICATIONS.1-71-3Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyPRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTSIMPORTANT SAFETYNOTICEThis manual was prepared for use only by properly trained audio-video servicetechnicians.When s

5、ervicing this product, under no circumstances should the original design bemodified or altered without permission from LG Corporation. All components should bereplaced only with types identical to those in the original circuit and their physicallocation, wiring and lead dress must conform to origina

6、l layout upon completion ofrepairs.Special components are also used to prevent x-radiation, shock and fire hazard.These components are indicated by the letter “x” included in their componentdesignators and are required to maintain safe performance. No deviations are allowedwithout prior approval by

7、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 setare not delayed until the new service literature is printed.CAUTION: Do not attempt to modify this product in any way. Ne

8、ver performcustomized installations without manufacturers approval. Unauthorized modificationswill not only void the warranty, but may lead to property damage or user injury.Service work should be performed only after you are thoroughly familiar with thesesafety checks and servicing guidelines.GRAPH

9、IC SYMBOLSThe exclamation point within an equilateral triangle is intended to alertthe service personnel to important safety information in the serviceliterature.The lightning flash with arrowhead symbol within an equilateral triangleis intended to alert the service personnel to the presence of noni

10、nsulated“dangerous voltage” that may be of sufficient magnitude to constitute arisk of electric shock.The pictorial representation of a fuse and its rating within an equilateraltriangle is intended to convey to the service personnel the following fusereplacement caution notice:CAUTION: FOR CONTINUED

11、 PROTECTION AGAINST RISK OFFIRE, REPLACE ALLFUSES WITH THE SAME TYPE AND RATINGAS MARKED NEAR EACH FUSE.SERVICE INFORMATIONWhile servicing, use an isolation transformer for protection from AC line shock. After theoriginal service problem has been corrected, make a check of the following:FIRE AND SHO

12、CK HAZARD1. Be sure that all components are positioned to avoid a possibility of adjacentcomponent shorts. This is especially important on items trans-ported to and from therepair shop.2. Verify that all protective devices such as insulators, barriers, covers, shields, strainreliefs, power supply co

13、rds, and other hardware have been reinstalled per theoriginal design. Be sure that the safety purpose of the polarized line plug has notbeen 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

14、 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 ifnecessary.5. No lead or component should touch a high current device or a resistor rated at 1 wattor more. Lead tension around pr

15、otruding metal surfaces must be avoided.6. After reassembly of the set, always perform an AC leakage test on all exposedmetallic parts of the cabinet (the channel selector knobs, antenna terminals, handleand screws) to be sure that set is safe to operate without danger of electrical shock.DO NOTUSE

16、ALINE ISOLATION TRANSFORMER DURING THIS TEST. Use anAC 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 150V AC typecapacitor between a known good earth ground water pipe, conduit, etc.) and theexposed metal

17、lic parts, one at a time. Measure the AC voltage across thecombination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug byusing a non-polarized adaptor and repeat AC voltage measurements for eachexposed metallic part. Voltage measured must not exceed 0.75 volts RMS. Thiscorresponds to

18、 0.5 milliamp AC. Any value exceeding this limit constitutes a potentialshock hazard and must be corrected immediately.TIPS ON PROPER INSTALLATION1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelfspace over, or close to, a heat duct, or in the path of heated air

19、 flow. 2. Avoid conditions of high humidity such as: outdoor patio installations where dew is afactor, near steam radiators where steam leakage is a factor, etc. 3. Avoid placement where draperies may obstruct venting. The customer should alsoavoid the use of decorative scarves or other coverings th

20、at might obstruct ventilation.4. Wall- and shelf-mounted installations using a commercial mounting kit must followthe factory-approved mounting instructions. Aproduct mounted to a shelf or platformmust retain its original feet (or the equivalent thickness in spacers) to provideadequate air flow acro

21、ss the bottom. Bolts or screws used for fasteners must nottouch any parts or wiring. Perform leakage tests on customized installations.5. Caution customers against mounting a product on a sloping shelf or in a tiltedposition, unless the receiver is properly secured.6. Aproduct on a roll-about cart s

22、hould be stable in its mounting to the cart.Caution the customer on the hazards of trying to roll a cart with small casters acrossthresholds or deep pile carpets.7. Caution customers against using extension cords. Explain that a forest ofextensions, sprouting from a single outlet, can lead to disast

23、rous consequences tohome and family.1-4Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySERVICING PRECAUTIONSCAUTION: Before servicing the DVD covered by this servicedata and its supplements and addends, read and follow theSAFETY PRECA

24、UTIONS. NOTE: if unforeseen circumstancescreate conflict between the following servicing precautionsand any of the safety precautions in this publication, alwaysfollow the safety precautions.Remember Safety First :General Servicing Precautions1.Always unplug the DVD AC power cord from the AC powerso

25、urce before:(1) Removing or reinstalling any component, circuit board,module, or any other assembly.(2) Disconnecting or reconnecting any internal electricalplug or other electrical connection.(3) Connecting a test substitute in parallel with anelectrolytic capacitor.Caution: A wrong part substituti

26、on or incorrect polarityinstallation of electrolytic capacitors may result in anexplosion hazard.2.Do not spray chemicals on or near this DVD or any of itsassemblies.3.Unless specified otherwise in this service data, cleanelectrical contacts by applying an appropriate contactcleaning solution to the

27、 contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication ofcontacts is not required.4.Do not defeat any plug/socket B+ voltage interlocks withwhich instruments covered by this service manual might beequipped.5.Do n

28、ot apply AC power to this DVD and / or any of itselectrical assemblies unless all solid state device heat sinksare correctly installed.6.Always connect the test instrument ground lead to anappropriate ground before connecting the test instrumentpositive lead. Always remove the test instrument ground

29、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 resistancebetween each blade of the attachment plug and accessibleconductive parts (Note 1)

30、 should be more than 1Mohm.Note 1: Accessible Conductive Parts include Metal panels,Input terminals, Earphone jacks,etc.Electrostatically Sensitive (ES) DevicesSome semiconductor (solid state) devices can be damagedeasily by static electricity. Such components commonly arecalled Electrostatically Se

31、nsitive (ES) Devices. Examples oftypical ES devices are integrated circuits and some field effecttransistors and semiconductor chip components.The following techniques should be used to help reduce theincidence of component damage caused by static electricity.1.Immediately before handling any semico

32、nductor componentor semiconductor-equipped assembly, drain off anyelectrostatic charge on your body by touching a known earthground. Alternatively, obtain and wear a commerciallyavailable discharging wrist strap device, which should beremoved for potential shock reasons prior to applying powerto the

33、 unit under test.2.After removing an electrical assembly equipped with ESdevices, place the assembly on a conductive surface suchas aluminum foil, to prevent electrostatic charge buildup orexposure of the assembly.3.Use only a grounded-tip soldering iron to solder or unsolderES devices.4.Use only an

34、 anti-static solder removal device. Some solderremoval devices not classified as “anti-static” can generateelectrical charges sufficient to damage ES devices.5.Do not use freon-propelled chemicals. These can generatean electrical charge sufficient to damage ES devices.6.Do not remove a replacement E

35、S device from its protectivepackage until immediately before you are ready to install it.(Most replacement ES devices are packaged with leadselectrically shorted together by conductive foam, aluminumfoil, or comparable conductive material).7.Immediately before removing the protective material fromth

36、e 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 safety precautions.8.Minimize bodily motions when handling unpackagedreplace

37、ment ES devices. (Normally harmless motion suchas the brushing together of your clothes fabric or the liftingof your foot from a carpeted floor can generate staticelectricity sufficient to damage an ES device.)1-5Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service pu

38、rposesLGE Internal Use OnlyTHE PROCESS OF DISC DOWNLOADPlease follow the below process to download a program with disc1. 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

39、choose a “TV Aspect” menu. And choose “16:9”menu.4. Press the 1 - 3 - 9 - 7 - 1 - 3 - 9(numerical button) - Enter key on remote control to confirm thesystem information.5. Remember or write the model name.6. Change the program file name of new version to the model nameEx New ver. program file-LG_DV_

40、LV80F7FC10EMSMIS_V014.ROMModel name - LG_DV_LV81F7FC00EMSChange New ver. program file like this - LG_DV_LV81F7FC00EMSMIS.ROM(NOTICE) You must add “MIS” at the end of model nameIf 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

41、copied disc to DVD-player.9. If the below picture 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 aut

42、omatically.12.Do it again the process 1, 2, 3, 4 to confirm the version.1-6Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only1-7Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Us

43、e OnlySPECIFICATIONS GENERALPower requirements AC 110V 240V, 50/60HzPower consumption 8WDimensions (Approx.) 360 x 35 x 195mm(W x H x D) without footNet Weight (Approx.) 2.3kgOperating temperature: 5C to 35COperating humidity 5% to 90%Laser Semiconductor laserSignal system PAL / NTSC OUTPUTSVideo Ou

44、tput 1.0V (p-p), 75, sync negative,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 2Audio Output 2.0Vrms (1kHz, 0dB), 600,RCA jack (L, R) x 1 /Digital Output (Coaxial) 0.5V (p-p), 75, RCA jack x 11-8Copyright 2008 LG Electronics.

45、Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyMEMO2-1Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySECTION 2CABINET & MAIN CHASSISCONTENTSEXPLODED VIEWS.2-21. CABINET AND MAIN FRAME SECTION.2-22.

46、 DECK MECHANISM SECTION (DP-12V).2-33. PACKING ACCESSORY SECTION.2-4OPTIONAL PARTSADACB460460462460250462462A46P101A47300CB462A26283467A48MAINSMPS5.1CHSCART276463KARAOKE &USBA43280279KEYCN903452DA49CABLE1TIMER452452462A44261261260262320465261A42A41CABLE2461275CN801CN802EXPLODED VIEWS2-2Copyright 200

47、8 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only1. CABINET AND MAIN FRAME SECTION2-3Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only2. DECK MECHANISM SECTION (DP-12V)442442010442012

48、012037012019026440015017013439018A02A26A01001002003014015A015B016020435A032-4Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only3. PACKING ACCESSORY SECTION808 Battery810 Cable Set AssyOPTIONAL PARTS832 Disc806 RF Cable811 Plug Assy 1way

49、(Yellow)820 Plug Assy 1way(Black)801 Owners Manual804 Packing Sheet803 Packing812 Plug Assy 2way900 Remocon803 Packing802 Box Carton3-1Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySECTION 3ELECTRICALCONTENTSELECTRICAL TROUBLESHOOTI

50、NG GUIDE.3-21. SMPS TROUBLESHOOTING FLOW.3-22. POWER CHECK FLOW .3-43. SYSTEM OPERATION FLOW.3-54. SYSTEM TEST FLOW .3-6DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING.3-121. SYSTEM 27MHZ CLOCK, RESET, FLASH R/W SIGNAL.3-122. SDRAM CLOCK .3-143. TRAY OPEN/CLOSE SIGNAL.3-144. SLED CONTROL RELATED