LG-LHT5025X-cdr-sm 维修电路原理图.pdf

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1、DVD/CD RECEIVERSERVICE MANUALSERVICE MANUALWebsite http:/Internal Use OnlyP/NO : AFN32853257 NOVEMBER, 2007MODELS : XH-T5020X / XH-T5025X LH-T5025X MODELS : XH-T5020X / XH-T5025X / LH-T5025XRadioFans.CN 收音机爱 好者资料库1-1CONTENTSSECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SERVICE INFORMATION FOR EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 SP

3、ECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5、 . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 AMP CI

6、RCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . .

7、. . . . . . . . . . . . . . . . . . . . . .4-1SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1Copyright 2007 LG Electronics.Inc.

8、All right reserved.Only for training and service purposesLGE Internal Use OnlyRadioFans.CN 收音机爱 好者资料库Copyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only1-2SERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport a

9、nd storage1) The pick-up should always be left in its conductive bag until immediately prior to use.2) The pick-up should never be subjected to external pressure or impact.2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.2) The pi

10、ck-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/ordamage to the printed-circuit board.3) Each and every pick-up is already individually adjusted

11、 to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely never be touched.4) Laser beams may damage the eyes!Absolutely never permit laser beams to enter the eyes!Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick

12、-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as usedfor camera lens).The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cottonswab should be used, taking care not to

13、distort this.6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too muchof this alcohol on the swab, and do n

14、ot allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look directly at the laser beam, and dont allow contact fingers or other exposed skin.MagnetHow to hold the pick-upConductive SheetCotton swabPressurePressureSECTION 1. GENERAL1-3Copyright 2007 LG Electronics.In

15、c.All right reserved.Only for training and service purposesLGE Internal Use OnlyNOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode).These componentsare sensitive to, and easily affected by, static electri

16、city. If such static electricity is high voltage, componentscan be damaged, and for that reason components should be handled with care.2) The pick-up is composed of many optical components and other high-precision components. Care must betaken, therefore, to avoid repair or storage where the tempera

17、ture of humidity is high, where strong magnet-ism is present, or where there is excessive dust.2. Notes for repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, measuring instruments and tools must be grounded.3) The workbench should

18、be covered with a conductive sheet and grounded.When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This isbecause there is the possibility of damage by static electricity.)4) To prevent AC leakage, the metal part of the soldering iron should be grounded.5)

19、 Workers should be grounded by an armband (1M )6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent sta-tic electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should NEVER be directly facing the e

20、yes or bare skin.Resistor(1 Mohm)ConductiveSheetResistor(1 Mohm)Armband1-4ESD PRECAUTIONSCopyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlyElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged ea

21、sily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integratedcircuits and some field-effect transistors and semiconductor chip components. The following techniques shouldbe used to help reduce the incidence of

22、 component damage caused by static electricity.1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain offany electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear acommercially available discharging wrist stra

23、p device, which should be removed for potential shock reasonsprior to applying power to the unit under test.2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surfacesuch as aluminum foil, to prevent electrostatic charge buildup or exposure of the

24、assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static cangenerate electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals. Th

25、ese can generate electrical charges sufficient to damage ESDdevices.6. Do not remove a replacement ESD device from its protective package until immediately before you areready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive foam, alumin

26、um foil or comparable conductive materials).7. Immediately before removing the protective material from the leads of a replacement ESD device, touch theprotective material to the chassis or circuit assembly into which the device will by installed.CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS

27、OR CIRCUIT, AND OBSERVE ALL OTHERSAFETY PRECAUTIONS.8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motionsuch as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gener-ate static electricity sufficient

28、 to damage an ESD device).CAUTION. GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHEAD SYMBOL.WITHIN AN EQUILATERAL TRIANGLE, ISINTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCL

29、AMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.1-5Copyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlySERVICE INFORMATION FOR EEPRO

30、M(DVD PART)POWER ONDVD LOGO Status (NO Disk status)Remote control Pause key-1-4-7-2 in order.Press number 09, Press characterAF (16 for a while)Use arrow key ( ) tomove to appropriate position andmake changesPress pause key onceChange will be applied when powerOFF-ON.NAMEOPT 1OPT 2OPT 3OPT 4OPT 5OPT

31、 6OPT 7OPT 8OPT 9OPT AOPT BOPT COPT DOPT EOPT FOPT GHEX555A40FF 5205FC314F00000000000000 DETECT NEW EEPROM(OPTION EDIT SCREEN)Copyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only1-6SERVICE INFORMATION FOR EEPROM(AMP PART)POWER ONFLD no disc

32、 statusRemote control 2 + Front STOPpush same timing during 5sFLD 00.Use arrow key ( ) moveto appropriate position and makechangesPress ENTER key onceFLD write ok or up okRemote control 2 + Front STOPpush same timingFLD display E2P CLR or EP CLRAuto power offDETECT NEW EEPROM(OPTION EDIT SCREEN)NAME

33、 HEX00 1601 EA02 2503 0000 00XH-T5020XNAME HEX00 1601 EA02 2303 0000 00XH-T5025XNAME HEX00 1601 EA02 2403 0000 00LH-T5025X1-7SPECIFICATIONSGENERALPower supply Refer to main label.Power consumption Refer to main label.Net Weight 3.6 kgExternal dimensions (W x H x D) 430 x 70 x 311 mmOperating conditi

34、ons Temperature:5C to 35C, Operation status:HorizontalOperating humidity 5% to 85%Laser Semiconductor laser, wavelength 650 nmCD/DVDSignal system PAL 625/50, NTSC 525/60Frequency response (audio) 200 Hz to 18 kHzSignal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP -6 dB, 20 kHz LPF/A-Filter)Dyn

35、amic range (audio) More than 70 dBHarmonic distortion (audio) 0.5 % (1 kHz, at 1W position) (20 kHz LPF)VIDEOVideo input 1.0 V (p-p), 75 , negative sync., RCA jack x 1Video output 1.0 V (p-p), 75 , negative sync., RCA jack x 1/SCART (TO TV)COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ohms, negative sync,

36、 RCA jack x 1(PB)/(PR) 0.7 V (p-p), 75 ohms, RCA jack x 1TUNERFMTuning Range 87.5 - 108.0 MHz or 65.0 - 74.0 MHz, 87.5 - 108.0 MHzIntermediate Frequency 10.7 MHzSignal-to Noise Ratio 60 dB (Mono)Frequency Response 140 - 8,000 HzAM MWTuning Range 522 - 1,620 kHz or 520 - 1,720 kHzIntermediate Frequen

37、cy 450 kHzAMPLIFIER Stereo mode 70 W + 70 W (4at 1 kHz, THD 10 %)Surround mode Front:70 W + 70 W (THD 10 %)Center*:70 WSurround*:70 W + 70 W (4at 1 kHz, THD 10 %)Subwoofer*:150 W (3at 30 Hz, THD 10 %)Inputs AUDIO IN, OPTICAL INOutputs MONITOR OUT, EURO AV (TO TV) OUT, COMPONENT VIDEO OUTSPEAKERS (SH

38、52PH)Front SpeakerCenter speakerRear SpeakerPassive Subwoofer(SH52PH-F)(SH52PH-C)(SH52PH-S)(SH52PH-W)Type2 Way 3 Speaker2 Way 3 Speaker1 Way 1 Speaker1 Way 1 SpeakerImpedance4443Frequency Response100 - 20000 Hz150 - 20000 Hz130 - 20000 Hz40 - 1500 HzSound Pressure Level82 dB/W (1m)82 dB/W (1m)82 dB/

39、W (1m)80 dB/W (1m)Rated Input Power70 W70 W70 W150 WMax.Input Power140 W140 W140 W300 WNet Dimensions260 x 1100 x 260 mm330 x 86 x 121 mm114 x 208.5 x 83 mm212 x 395 x 341 mm(W x H x D)Net Weight3.0 kg1.15 kg0.55 kg6.0 kg(* Depending on the sound modesettings and the source, there maybe no sound out

40、put.)Copyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlyCopyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlySPEAKERS (SH52TH)Front Speaker Center speaker Rear Speaker Passive Subw

41、oofer(SH52TH-F) (SH52TH-C) (SH52TH-S) (SH52TH-W)Type 2 Way 3 Speaker 2 Way 3 Speaker 2 Way 3 Speaker 1 Way 1 SpeakerImpedance 4 4 4 3Frequency Response 100 - 20000 Hz 150 - 20000 Hz 130 - 20000 Hz 40 - 1500 HzSound Pressure Level 82 dB/W (1m) 82 dB/W (1m) 82 dB/W (1m) 80 dB/W (1m)Rated Input Power 7

42、0 W 70 W 70 W 150 WMax. Input Power 140 W 140 W 140 W 300 WNet Dimensions 260 x 1100 x 260 mm 330 x 86 x 121 mm 260 x 1100 x 260 mm 212 x 395 x 341 mm(W x H x D)Net Weight3.0 kg1.15 kg0.55 kg6.0 kgSPEAKERS (SH52SH)Front/Rear Speaker Center speaker Passive Subwoofer(SH52SH-S)(SH52SH-C)(SH52SH-W)Type

43、1 Way 1 Speaker1 Way 2 Speaker1 Way 1 SpeakerImpedance 4 4 3 Frequency Response 130 - 20000 Hz130 - 20000 Hz40 - 1500 HzSound Pressure Level 82 dB/W (1m)82 dB/W (1m)80 dB/W (1m)Rated Input Power 70 W70 W150 WMax. Input Power 140 W140 W300 WNet Dimensions(W x H x D) 114 x 208.5 x 83 mm330 x 86 x 121

44、mm212 x 395 x 341 mmNet Weight 0.55 kg1.15 kg6.0 kg1-82-1Copyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlySECTION 2. AUDIO PARTAUDIO TROUBLESHOOTING GUIDE1. POWER SUPPLY CIRCUITInsert power cordYESYESYESYESYESYESYESTurn power on.NOCheck

45、power plug and power supply circuit.NOCheck power supply circuit.NOCheck laser circuit.Check focus circuit.Check disc.NONOCheck tracking servo circuit.Check audio circuit.Is the Digitron on correctly?Is power on?Does initial read work?Does it play?Does it output audio?OK2-2Copyright 2007 LG Electron

46、ics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only2. FRONT CIRCUIT (1/2)YESYESYESYESYESYESYESNONOReconnect it.(Refer to notice *1)Red LED turn off?Check if PN301 is ok?NONONORefer to smps part.Check pattern andresoldering Is the Digitron on correctly?Check if all

47、buttons are ok?Check if the front power is ok?(*2)Check if DIS301 is ok?NO1Check if the remote control is ok?NO2Power on.Front B/D ok.*1 : When it is needed to reconnected FFC cable into PN301 Short 1pin of PN103 with 18pin of CN901 in amp part*2 : PN603 Pins.PIN1 : -35 VKKPIN2 : -30 FL+PIN3 : -33 F

48、L-PIN7 : +5VPIN13 : +5VA2-3Copyright 2007 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only3. FRONT CIRCUIT (2/2)YESYESYESYESYESYESYESYESNORefer to power(SMPS).NOReplace R345 R350, R154.Check if the power part of the front is ok?Check if R345R350, R154

49、 ok?Refer to micom circuit.1NORefer to power(SMPS).NORefer to micom circuit.NOCheck rm circuitCheck if the power part of the front is ok?Check if the remote control waveform ofPN301 pin11 is ok?Check if RC2 voltage is ok(5V)?Resolder or replace RC2.2Copyright 2007 LG Electronics.Inc.All right reserv

50、ed.Only for training and service purposesLGE Internal Use Only2-42-5WIRING DIAGRAMFANVOLUMEDCACKMDSMPS PCBFRONT PCBVFDAMP PCBSPEAKER TERMINALMAIN PCBHDMIJACKSCART JACKAV JACKCOMPONENT S/WOPTICAL INHEAT SINKPN602PN203PN601CN602PN603PN202PN206PN302PN2026630R-FB05K6630XE00111PN20411PINMIC1CN301EAD35219