LG-DP372B-dvd-sm 电路图 维修手册.pdf

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1、PORTABLE DVD SERVICE MANUAL MODEL: DP372B CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETYPRECAUTIONS” IN THIS MANUAL. MODEL: DP372BSERVICE MANUAL P/NO : AFN56903619 MARCH , 2008 Website Internal Use Only Av. Sor Juana lns de la Cruz No 555 Col. San Lorenzo Tlalnepantla, Estado de Mxico CP 54033

2、Tel. 321 19 00 Fax. 5 657549 Lada sin costo 01 800 50 481 00 RadioFans.CN 收音机爱 好者资料库 1-1 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only CONTENTS SECTION 1.SUMMARY SECTION 2.EXPLODED VIEWS SECTION 3.ELECTRICAL SECTION 4.REPLACEMENT

3、 PARTS LIST RadioFans.CN 收音机爱 好者资料库 1-2 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR PORTABLE DVD PRODUCTS.1-3 SERVICING PRECAUTIONS.1-4 GENERAL SERVICING PRECAU

4、TIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE (ES) DEVICES SPECIFICATIONS.1-5 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 PORTABLE DVD PRODUC

5、TS IMPORTANT SAFETYNOTICE This 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 be modified or altered without permission from LG Corporation. All components should be replaced only

6、with types identical to those in the original circuit and their physical 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” includ

7、ed in their component desig- nators and are required to maintain safe performance. No deviations are allowed without 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 ch

8、anges into the set are not 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 will not only void the warranty, but may lead to property dam

9、age or user injury. Service work should be performed only after you are thoroughly 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 servic

10、e 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 to constitute a risk of electric shock. The pictorial representation of a fu

11、se and its rating within an equilater- al triangle is intended to convey to the service personnel the following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RAT- ING AS MARKED NEAR EACH FUSE. SERVICE INFORMATION Whi

12、le servicing, use an isolation transformer for protection from AC line shock. After the 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 com- ponent shorts. This is espec

13、ially important on items trans-ported to and from the repair shop. 2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the orig- inal design. Be sure that the safety purpose of the polar

14、ized line plug has not been defeated. 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 lea

15、ds 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 1 watt or more. Lead tension around protruding metal surfaces must be avoided. 6. After reassembly of the set, always perform an AC leakage

16、test on all exposed metallic 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 electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or

17、 more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .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 resist

18、or and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage 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 poten- tial shock hazar

19、d and must be corrected immediately. TIPS ON PROPER INSTALLATION 1. Never install any receiver in a 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

20、 where dew is a factor, near steam radiators where steam leakage is a factor, etc. 3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventila- tion. 4. Wall- and shelf-mounted installations usin

21、g a commercial mounting kit must follow the factory-approved mounting instructions. Aproduct mounted to a shelf or plat- form 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 p

22、arts 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 custome

23、r on the hazards of trying to roll a cart with small casters across 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 to home and family. 1-4 Copyright 2008 L

24、G Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SERVICING PRECAUTIONS CAUTION: Before servicing the PORTABLE DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE: if unforeseen cir- cumstan

25、ces create conflict between the following servicing precautions and any of the safety precautions in this publica- tion, always follow the safety precautions. Remember Safety First : General Servicing Precautions 1.Always unplug the PORTABLE DVD AC power cord from the AC power source before: (1) Rem

26、oving or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any internal electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an electrolyt- ic capacitor. Caution: A wrong part substitution or incor

27、rect polarity installation of electrolytic capacitors may result in an explosion hazard. 2.Do not spray chemicals on or near this PORTABLE DVD or any of its assemblies. 3.Unless specified otherwise in this service data, clean elec- trical contacts by applying an appropriate contact cleaning solution

28、 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 which instruments covered by this service manual might be equi

29、pped. 5.Do not apply AC power to this PORTABLE DVD and / or any of its electrical assemblies unless all solid state device heat sinks are correctly installed. 6.Always connect the test instrument ground lead to an appro- priate ground before connecting the test instrument positive lead. Always remov

30、e 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 resistance between each blade of the attachment plug and a

31、ccessible conductive parts (Note 1) should be more than 1Mohm. Note 1: Accessible Conductive Parts include Metal panels, Input terminals, Earphone jacks,etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

32、 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 damage caused by static electri

33、city. 1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electro- static charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially avail- able discharging wrist strap device, which should be removed fo

34、r 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 assembly. 3.Use only a grounded-tip

35、 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-static” can generate electrical charges sufficient to damage ES devices. 5.Do not use freon-propelled chemicals. These can generate an electrical cha

36、rge 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 it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductiv

37、e 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 chassis or cir- cuit, and observe all ot

38、her 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 sufficient to damage an ES device.) 1-

39、5 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SPECIFICATIONS DVD PLAYER Power requirementsDC 12V Power consumption12W External dimensions207 x 39 x 168mm (W x H x D) Net weight (Approx.)0.85kg Operating temperature5C to 40C Ope

40、rating humidity5% to 90% Laser semiconductorlaser Signal system NTSC CONNECTORS Audio/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 DISPLAY Panel size7inches wide (diagonal) Projection s

41、ystemR.G.B. stripe Driving system TFT active matrix Resolution480 x 234 (WQVGA) SUPPLIED ACCESSORIES RCA Video/Audio cable AC Adapter (MPA-630) Automotive Adapter (DPDC1) Remote Control Battery for Remote Control (Lithium Battery) 1-6 Copyright 2008 LG Electronics. Inc. All right reserved. Only for

42、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 EXPLODED VIEWS CONTENTS EXPLODED VIEWS.2-2 1. CABINET AND MAIN FRAME SECTION.2-2 2. PACKING ACCESSORY SECTION.2-

43、3 2-2 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only D C G H I A E F G L M C A F E D K J B B A48 A53 A00 A46 A44 A40 A52 A45 A51 A43 A41 277 288 265 264 295 293 296 289 263 262 809 285 285 284 269 261 260 266 283 L K H I J M 279 2

44、78 CABLE10 CABLE9 CABLE8 CABLE1 282 281 288 286 287 252 272 277 253 LCD BOARD INVERTER BOARD KEY BOARD MAIN BOARD CABLE2 CABLE3 262 266 251 251A EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION 2-3 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Int

45、ernal Use Only 2. PACKING ACCESSORY SECTION PLUG ASSY(RCA CABLE)806 BATTERY808 834 ADAPTER833 REMOTE CONTROL900 MASTER BOX802 BOX802B BOX802A 801OWNERS MANUAL CABLE, CIGAR JACK 804PACKING SHEET 803BAG 835 CAR-MOUNT 2-4 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and ser

46、vice purposes LGE Internal Use Only MEMO 3-1 Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE.3-2 1. POWER CHECK FLOW.3-2 2. SYSTEM OPERATION FLOW .3-3 3. SYSTEM TEST FLOW .3-4 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING.