LG-DP351G-dvd-sm 维修电路原理图.pdf

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1、PORTABLE DVDSERVICE MANUALMODEL: DP351GCAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”IN THIS MANUAL.MODEL: DP351GSERVICE MANUALP/NO : AFN56903641Website http:/Internal Use OnlyAPRIL, 2008Av. Sor Juana lns de la Cruz No 555Col. San LorenzoTlalnepantla, Estado de Mxico CP 54033Tel. 32

2、1 19 00 Fax. 5 657549Lada sin costo 01 800 50 481 00RadioFans.CN 收音机爱 好者资料库Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyCONTENTSSECTION 1.SUMMARYSECTION 2.EXPLODED VIEWSSECTION 3.ELECTRICALSECTION 4.REPLACEMENT PARTS LISTRadioFans.

3、CN 收音机爱 好者资料库SECTION 1SUMMARYCONTENTS1-2Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.1-3SERVICING PRECAUTIONS.1-4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE EL

4、ECTROSTATICALLY SENSITIVE (ES) DEVICESSPECIFICATIONS.1-51-3Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTSIMPORTANT SAFETYNOTICEThis manual was prepared for use only by properly t

5、rained audio-video servicetechnicians.When servicing 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, w

6、iring and lead dress must conform to original 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 devi

7、ations are allowedwithout 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 setare not delayed until the new service literature is printed.CAUTION: Do not a

8、ttempt to modify this product in any way. Never 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 these

9、safety checks and servicing guidelines.GRAPHIC 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 t

10、he service personnel to the presence of noninsulated“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 fuserepla

11、cement caution notice:CAUTION: FOR CONTINUED 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

12、, make a check of the following:FIRE AND SHOCK 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, cov

13、ers, shields, strainreliefs, power supply cords, 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 po

14、ints. 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 ifnecessary.5. No lead or component should touch a high current device or a resistor ra

15、ted at 1 wattor more. Lead tension around protruding 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 w

16、ithout danger of electrical shock.DO NOTUSE 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 wat

17、er pipe, conduit, etc.) and theexposed metallic 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 n

18、ot exceed 0.75 volts RMS. Thiscorresponds to 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 t

19、o, 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 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

20、 of decorative scarves or other coverings that 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

21、in spacers) to provideadequate air flow across 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 properl

22、y 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 acrossthresholds or deep pile carpets.7. Caution customers against using extension cords. Explain that a forest ofextensions, sprout

23、ing from a single outlet, can lead to disastrous 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 PORTABLE DVD covered bythis service data and its sup

24、plements and addends, read andfollow the SAFETY PRECAUTIONS. NOTE: if unforeseencircumstances create conflict between the following servicingprecautions and any of the safety precautions in thispublication, always follow the safety precautions.Remember Safety First :General Servicing Precautions1.Al

25、ways unplug the PORTABLE DVD AC power cord fromthe AC power source 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

26、with anelectrolytic capacitor.Caution: A wrong part substitution or incorrect polarityinstallation of electrolytic capacitors may result in anexplosion hazard.2.Do not spray chemicals on or near this PORTABLE DVD orany of its assemblies.3.Unless specified otherwise in this service data, cleanelectri

27、cal contacts by applying an appropriate contactcleaning solution to the 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 withw

28、hich instruments covered by this service manual might beequipped.5.Do not apply AC power to this PORTABLE DVD and / or anyof its electrical assemblies unless all solid state device heatsinks are correctly installed.6.Always connect the test instrument ground lead to anappropriate ground before conne

29、cting the test instrumentpositive lead. Always remove the test instrument groundlead 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 resistanceb

30、etween each blade of the attachment plug and accessibleconductive parts (Note 1) 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 damagedeasil

31、y by static electricity. Such components commonly arecalled Electrostatically Sensitive (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 compon

32、ent damage caused by static electricity.1.Immediately before handling any semiconductor 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,

33、which should beremoved for potential shock reasons prior to applying powerto the 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

34、only a grounded-tip soldering iron to solder or unsolderES devices.4.Use only an 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 e

35、lectrical charge sufficient to damage ES devices.6.Do not remove a replacement ES 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 c

36、onductive 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 ot

37、her safety precautions.8.Minimize bodily motions when handling unpackagedreplacement 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.)1-5Copyrig

38、ht 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySPECIFICATIONS GENERALPower requirementsDC 12VPower consumption12WExternal Dimensions202 x 39 x 164mm (W x H x D)Net Weight (Approx.)0.85kgOperating temperature: 5C to 40COperating humidity5% t

39、o 90%LaserSemiconductor laserSignal system NTSC CONNECTORSAudio/Video Output3.5mm mini jack x 1- Video: 1.0V(p-p), 75, sync negative- Audio: 1.5Vrms (1kHz, 0dB)Earphone terminal3.5mm stereo mini jack x 1 LIQUID CRYSTAL DISPLAYPanel size7 inches wide (diagonal)Projection systemR.G.B. stripeDriving sy

40、stem TFT active matrixResolution480 x 234 (WQVGA) SUPPLIED ACCESSORIES- RCA Video/Audio cable- AC Adapter (MPA-630)- Automotive Adapter (DPDC1)- Remote Control- Battery for Remote Control (Lithium Battery)1-6Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purpose

41、sLGE Internal Use OnlyMEMO2-1Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySECTION 2EXPLODED VIEWSCONTENTSEXPLODED VIEWS.2-21. CABINET AND MAIN FRAME SECTION.2-22. PACKING ACCESSORY SECTION.2-32-2Copyright 2008 LG Electronics. Inc.

42、All right reserved.Only for training and service purposesLGE Internal Use OnlyJKHIBECDILKJLDAGCBEAFFGH293295296277253272277A52A45288288264278297262263809285285286282CABLE1CABLE2CABLE3281289A44A00A46283A48A43A40A53LCDLCD PANELKEYMAINA51262251251A287EXPLODED VIEWS1. CABINET AND MAIN FRAME SECTION2-3Co

43、pyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only2. PACKING ACCESSORY SECTIONPLUG ASSY(RCA CABLE)806834ADAPTER833REMOTE CONTROL900BOX802BOX802A808BATTERY801OWNERS MANUALCABLE, CIGAR JACK804PACKING SHEET803PACKINGBOX802B2-4Copyright 2008

44、LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyMEMO3-1Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySECTION 3ELECTRICALCONTENTSLCD PART.3-2LCD ELECTRICAL TROUBLESHOOTING GUIDE.3-2B

45、LOCK DIAGRAM.3-3CIRCUIT DIAGRAM.3-5PRINTED CIRCUIT BOARD DIAGRAM.3-7MAIN PART.3-11MAIN ELECTRICAL TROUBLESHOOTING GUIDE.3-111. DC-DC CONVERTER CIRCUIT.3-112. MPEG CIRCUIT .3-143. RF/SERVO CIRCUIT.3-154. CHARGING CIRCUIT .3-18DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING.3-191. SYSTEM 27MHz CLOC

46、K, RESET & FLASH R/W SIGNAL.3-192. SDRAM CLOCK.3-193. DISC TYPE JUDGEMENT WAVEFORM.3-204. FOCUS ON WAVEFORM.3-225. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION).3-226. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) .3-237. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) .3-248. MT1389 VIDEO OUTPU

47、T WAVEFORM .3-249. AUDIO OUTPUT FROM AUDIO DAC.3-25WIRING CONNECTION DIAGRAMS.3-261. WIRING CONNECTION DIAGRAMS-1 .3-262. WIRING CONNECTION DIAGRAMS-2 .3-27BLOCK DIAGRAMS.3-291. OVERALL BLOCK DIAGRAM.3-292. POWER BLOCK DIAGRAM.3-313. SERVO BLOCK DIAGRAM.3-334. SYSTEM BLOCK DIAGRAM.3-355. AV BLOCK DI

48、AGRAM.3-37CIRCUIT DIAGRAMS.3-391. MPEG CIRCUIT DIAGRAM .3-392. MEMORY CIRCUIT DIAGRAM.3-413. OPU & MOTOR CIRCUIT DIAGRAM .3-434. AV CIRCUIT DIAGRAM.3-455. CHARGE CIRCUIT DIAGRAM.3-476. LCD I/F CIRCUIT DIAGRAM.3-497. KEY MENU CIRCUIT DIAGRAM.3-51 CIRCUIT VOLTAGE CHART.3-53PRINTED CIRCUIT BOARD DIAGRA

49、MS.3-571. MAIN P.C.BOARD.3-572. KEY MENU P.C.BOARD .3-61LCD PART3-2Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyLCD ELECTRICAL TROUBLESHOOTING GUIDEYESDisplay condition?Inverter abnormalNOAppear shadow forminterference in black bac

50、kgroundFuse normal?Fuse ReplaceYESNO+7.5V, 15V, -10VD906, D901, D902YESNO+5V normal?IC(U902) Check and ReplaceYESNOR G B signal output?Check and ReplaceMPEG1389LP (Pin107, 108, 109)YESNOVCOM signal?(Vip 4.5)IC(U901) Check and ReplaceYESNOLCD MODE CONT signal? All “LOW” (Normalcondition?)MAIN B/D Che