LG-DP372B-dvd-sm 维修电路原理图.pdf

PORTABLE DVDSERVICE MANUALMODEL: DP372BCAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETYPRECAUTIONS”IN THIS MANUAL.MODEL: DP372BSERVICE MANUALP/NO : AFN56903619 MARCH , 2008Website http:/Internal Use OnlyAv. Sor Juana lns de la Cruz No 555Col. San LorenzoTlalnepantla, Estado de Mxico CP 54033Tel. 321 19 00 Fax. 5 657549Lada sin costo 01 800 50 481 00RadioFans.CN 收音机爱 好者资料库1-1Copyright 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.CN 收音机爱 好者资料库1-2Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySECTION 1SUMMARYCONTENTSPRODUCT SAFETY SERVICING GUIDELINES FOR PORTABLE DVD PRODUCTS.1-3SERVICING PRECAUTIONS.1-4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY 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 PORTABLE DVD PRODUCTSIMPORTANT SAFETYNOTICEThis manual was prepared for use only by properly trained audio-video service tech-nicians.When servicing this product, under no circumstances should the original design bemodified or altered without permission from LG Corporation. All components shouldbe replaced only with types identical to those in the original circuit and their physicallocation, wiring 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 component desig-nators and are required to maintain safe performance. No deviations are allowedwithout prior approval by LG Corporation.Circuit diagrams may occasionally differ from the actual circuit used. This way, imple-mentation of the latest safety and performance improvement changes into the set arenot delayed until the new service literature is printed.CAUTION: Do not attempt to modify this product in any way. Never perform cus-tomized installations without manufacturers approval. Unauthorized modifications willnot 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.GRAPHIC SYMBOLSThe exclamation point within an equilateral triangle is intended to alertthe service personnel to important safety information in the service lit-erature.The lightning flash with arrowhead symbol within an equilateral trian-gle is intended to alert the service personnel to the presence of non-insulated “dangerous voltage” that may be of sufficient magnitude toconstitute a risk of electric shock.The pictorial representation of a fuse and its rating within an equilater-al triangle is intended to convey to the service personnel the followingfuse replacement caution notice:CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OFFIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RAT-ING AS MARKED NEAR EACH FUSE.SERVICE INFORMATIONWhile servicing, use an isolation transformer for protection from AC line shock. Afterthe original service problem has been corrected, make a check of the following:FIRE AND SHOCK HAZARD1. Be sure that all components are positioned to avoid a possibility of adjacent com-ponent 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 cords, and other hardware have been reinstalled per the orig-inal design. Be sure that the safety purpose of the polarized line plug has not beendefeated.3. Soldering must be inspected to discover possible cold solder joints, solder splash-es, 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 nec-essary.5. No lead or component should touch a high current device or a resistor rated at 1watt 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 exposedmetallic parts of the cabinet (the channel selector knobs, antenna terminals, han-dle and screws) to be sure that set is safe to operate without danger of electricalshock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THISTEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in thefollowing manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd150V 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 acrossthe combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plugby using a non-polarized adaptor and repeat AC voltage measurements for eachexposed metallic part. Voltage measured must not exceed 0.75 volts RMS. Thiscorresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a poten-tial shock 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 flow. 2. Avoid conditions of high humidity such as: outdoor patio installations where dewis a factor, 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 that might obstruct ventila-tion.4. Wall- and shelf-mounted installations using a commercial mounting kit must followthe factory-approved mounting instructions. Aproduct mounted to a shelf or plat-form must retain its original feet (or the equivalent thickness 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 tilted posi-tion, 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 castersacross thresholds or deep pile carpets.7. Caution customers against using extension cords. Explain that a forest of exten-sions, sprouting 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 supplements and addends, read andfollow the SAFETY PRECAUTIONS. NOTE: if unforeseen cir-cumstances create conflict between the following servicingprecautions and any of the safety precautions in this publica-tion, always follow the safety precautions.Remember Safety First :General Servicing Precautions1.Always 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 with an electrolyt-ic 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, clean elec-trical contacts by applying an appropriate contact cleaningsolution to the contacts with a pipe cleaner, cotton-tippedswab, 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 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 an appro-priate ground before connecting the test instrument positivelead. 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 resistancebetween 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 damagedeasily 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 component damage caused by static electricity.1.Immediately before handling any semiconductor componentor semiconductor-equipped assembly, drain off any electro-static charge on your body by touching a known earthground. Alternatively, obtain and wear a commercially avail-able discharging wrist strap device, 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 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 electrical 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 conductive 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 or cir-cuit, and observe all other 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 static elec-tricity sufficient to damage an ES device.)1-5Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlySPECIFICATIONS DVD PLAYERPower requirementsDC 12VPower consumption12WExternal dimensions207 x 39 x 168mm (W x H x D)Net weight (Approx.)0.85kgOperating temperature5C to 40COperating humidity5% to 90%Laser semiconductorlaserSignal system NTSC CONNECTORSAudio/Video Output 3.5mm mini jack x 1- Video: 1.0V(p-p), 75, sync negative- Audio: 1.5Vrms (1kHz, 0dB)Earphone terminal 3.5mm stereo mini jack x 2 LIQUID CRYSTAL DISPLAYPanel size7inches wide (diagonal)Projection systemR.G.B. stripeDriving system TFT active matrixResolution480 x 234 (WQVGA) SUPPLIED ACCESSORIESRCA Video/Audio cableAC Adapter (MPA-630)Automotive Adapter (DPDC1)Remote ControlBattery for Remote Control (Lithium Battery)1-6Copyright 2008 LG Electronics. 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 2EXPLODED VIEWSCONTENTSEXPLODED VIEWS.2-21. CABINET AND MAIN FRAME SECTION.2-22. PACKING ACCESSORY SECTION.2-32-2Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyDCGHIAEFGLMCAFEDKJBBA48A53A00A46A44A40A52A45A51A43A41277288265264295293296289263262809285285284269261260266283LKHIJM279278CABLE10CABLE9CABLE8CABLE1282281288286287252272277253LCDBOARDINVERTERBOARDKEYBOARDMAINBOARDCABLE2CABLE3262266251251AEXPLODED VIEWS1. CABINET AND MAIN FRAME SECTION2-3Copyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only2. PACKING ACCESSORY SECTIONPLUG ASSY(RCA CABLE)806BATTERY808834ADAPTER833REMOTE CONTROL900MASTER BOX802BOX802BBOX802A801OWNERS MANUALCABLE, CIGAR JACK804PACKING SHEET803BAG835 CAR-MOUNT2-4Copyright 2008 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 3ELECTRICALCONTENTSELECTRICAL TROUBLESHOOTING GUIDE.3-21. POWER CHECK FLOW.3-22. SYSTEM OPERATION FLOW .3-33. SYSTEM TEST FLOW .3-4DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING.3-101. SYSTEM 27MHZ CLOCK, RESET, FLASH SCK SIGNAL.3-102. SDRAM CLOCK.3-123. TRAY OPEN/CLOSE SIGNAL.3-124. SLED CONTROL RELATED SIGNAL.3-135. LASER POWER CONTROL RELATED SIGNAL.3-146. SPINDLE CONTROL WAVEFORM.3-147. FOCUS ON WAVEFORM.3-158. TRACKING CONTROL RELATED SIGNAL(System checking).3-169. 1389DE/LP VIDEO OUTPUT WAVEFORM.3-1710. AUDIO OUTPUT FROM 1389DE/LP .3-17WIRING CONNECTION DIAGRAMS.3-181. WIRING CONNECTION DIAGRAM-1.3-182. WIRING CONNECTION DIAGRAM-2.3-19BLOCK DIAGRAMS.3-201. OVERALL BLOCK DIAGRAM.3-202. POWER BLOCK DIAGRAM.3-213. SERVO BLOCK DIAGRAM.3-224. SYSTEM BLOCK DIAGRAM.3-235. AV BLOCK DIAGRAM.3-246. LCD BLOCK DIAGRAM.3-25CIRCUIT DIAGRAMS.3-271. MPEG CIRCUIT DIAGRAM .3-272. MEMORY CIRCUIT DIAGRAM.3-293. OPU & MOTOR CIRCUIT DIAGRAM .3-314. AV CIRCUIT DIAGRAM.3-335. CHARGE CIRCUIT DIAGRAM.3-356. LCD IF CIRCUIT DIAGRAM.3-377. AUDIO CIRCUIT DIAGRAM.3-398. KEY CIRCUIT DIAGRAM.3-419. LCD KEY CIRCUIT DIAGRAM.3-43CIRCUIT VOLTAGE CHART.3-45PRINTED CIRCUIT BOARD DIAGRAMS.3-491. MAIN P.C.BOARD.3-492. LCD P.C.BOARD.3-533. INVERTER P.C.BOARD.3-534. KEY P.C.BOARD.3-533-2ELECTRICAL TROUBLESHOOTING GUIDECopyright 2008 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use OnlyNo 3.3VACheck Q402/Q415and ReplaceReplace U401NO1. POWER CHECK FLOWA.B.Is 5VA sectionworking?Check Q408/D401and ReplaceCheck Q410/D402and ReplaceYESYESYESNOIs VCC_5V sectionworking?No 5VACheck D606ReplaceNOBAT_OUT=12V?YESYES3-3Copyright 2008 LG Electronics. Inc. All right reserved.Only for training