LG-LHW75-whs-sm 维修电路原理图.pdf

《LG-LHW75-whs-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《LG-LHW75-whs-sm 维修电路原理图.pdf（66页珍藏版）》请在收音机爱好者资料库上搜索。

1、WIRELESS DVD RECEIVER SYSTEMSERVICE MANUALMODEL : LH-W750,1,2,3TALHS-W75TAC, LHS-W75TAF, LHS-W75TAL, LHS-W75TAR,LHS-W75TAW, ACC75TMODEL : LH-W750,1,2,3TALHS-W75TAC, LHS-W75TAF, LHS-W75TAL, LHS-W75TAR, LHS-W75TAW, ACC75TSERVICE MANUALRadioFans.CN 收音机爱 好者资料库1-1CONTENTSSECTION 1. GENERAL SERVICING PREC

2、AUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . . .3-22SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . .

7、 . . . . . . . . . . . . . .6-1RadioFans.CN 收音机爱 好者资料库1-2SERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and 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 pressu

8、re or impact.2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.2) The pick-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

9、result may be an operational malfunction and/ordamage to the printed-circuit board.3) Each and every pick-up is already individually adjusted 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 th

10、e 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-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 ca

11、mera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cot-ton swab should be used, taking care not to 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 sw

12、ab. (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 not allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look directly at the laser beam, and dont let contact fingers or o

13、ther exposed skin.MagnetHow to hold the pick-upConductive SheetCotton swabPressurePressureSECTION 1. GENERAL1-3NOTES 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 ea

14、sily affected by, static electricity. 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 rep

15、air or storage where the temperature 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 g

16、rounded.3) The workbench should 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 sold

17、ering iron should be grounded.5) 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 preventstatic electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should

18、NEVER be directly facing the eyes or bare skin.Resistor(1 Mohm)ConductiveSheetResistor(1 Mohm)Armband1-4ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically S

19、ensitive 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 component damage caused by static electricity.1. Immediately before handling any

20、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 strap device, which should be removed for potential shock reasonsprior to applying pow

21、er 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 assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESD devic

22、es.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. These can generate electrical charges sufficient to damage ESDdevices.6. Do not remo

23、ve 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, aluminum foil or comparable conductive materials).7. Immediately before removing the pro

24、tective 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 OR CIRCUIT, AND OBSERVE ALL OTHERSAFETY PRECAUTIONS.8. Minimize bodily motions whe

25、n 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 to damage an ESD device).CAUTION. GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHE

26、AD 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 EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THESERVICE PERS

27、ONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.1-5GENERALPower supply Refer to main labelPower consumption Refer to main labelWeight 3.9 kgExternal dimensions (W x H x D) 430 x 54 x 350 mmOperating conditions Temperature: 5C to 35C, Operation status: HorizontalOperating h

28、umidity 5% to 85%CD/DVDLaser Semiconductor laser, wavelength 650 nmSignal system PAL 625/50, NTSC 525/60Frequency response (audio) 200 Hz to 20 kHzSignal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP, 20 kHz LPF/A-Filter)Dynamic range (audio) More than 70 dBHarmonic distortion (audio) 0.5 % (1

29、kHz, at 12W position) (20 kHz LPF/A-Filter)VIDEOVideo input 1.0 V (p-p), 75 , negative sync., RCA jack x 1/ SCART (TO TV)Video output 1.0 V (p-p), 75 , negative sync., RCA jack x 1/ SCART (TO TV)S-video output (Y) 1.0 V (p-p), 75 , negative sync., Mini DIN 4-pin x 1(C) 0.3 V (p-p), 75 Component Vide

30、o output (Y) 1.0 V (p-p), 75 , negative sync., RCA jack x 1(Pb)/(Pr) 0.7 V (p-p), 75 , 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 - 10,000 HzAM MWTuning Range 522 - 1,620

31、 kHz or 520 - 1,720 kHzIntermediate Frequency 450 kHzAMPLIFIERStereo mode 100W + 100W (6 at 1 kHz, THD 10 %)Surround mode Front: 100W + 100W (THD 10 %)Center*: 100WSurround*: 100W + 100W (6 at 1 kHz, THD 10 %)Subwoofer*: 200W (4 at 30 Hz, THD 10 %)InputAV1, OPTICAL AUDIO, MIC Jack(3.5mm)OutputS-VIDE

32、O, MONITOR, PHONRD : (32, 10.V)TRANSMITTERTransmission Output : 2.4GHz, Power Supply : DC 7VReception Output : 2.4GHzSPEAKERSFront Speaker Centre speaker Subwoofer Wireless SpeakerType 1 Way 2 Speaker 1 Way 2 Speaker 1 Way 1 Speaker 1 Way 2 SpeakerImpedance 6 6 4 6 Frequency Response 150 - 20,000 Hz

33、 150 - 20,000 Hz 40 - 1,500 Hz 150 - 20,000 HzSound Pressure Level 86 dB/W (1m) 86 dB/W (1m) 82 dB/W (1m) 86 dB/W (1m)Rated Input Power 100 W 100 W 200 W 100 WMax. Input Power 200 W 200 W 400 W 200 WNet Dimensions(WxHxD) 270 x 1190 x 270 mm 500 x 83 x 105 mm 300 x 440 x 410 mm 270 x 1190 x 270 mmNet

34、 Weight2.9kg 1.2kg 8.5kg 2.9kg(* Depending on the sound modesettings and the source, theremay be no sound output.)SPECIFICATIONS2-1SECTION 2. AUDIO PARTAUDIO TROUBLESHOOTING GUIDE1. POWER SUPPLY CIRCUIT2-22. FRONT CIRCUIT (1/2)PIN3PIN4PIN9: -27.5 FL-: -32.4 VKK: -23.7 FL+: +5.0CN902CN9022-33. FRONT

35、CIRCUIT (2/2)2-42-5WIRING DIAGRAMWIRELESSOPTICALINSCART JACKOPTION SWAV1,2COMPONENTMONITOR OUTS-VIDEO OUTTUNERSPEAKER TERMINALMAIN PCBAMP PCBSMPS PCBMDFRONT PCBFRONT PCBMIC&USB PCBVFDH/P JACKUSB JACKMICJACKMICJACKCN001PN005CN350PN8016PIN5PIN23PIN11PIN24PIN23PIN14PIN14PIN30PINPN103PN104PN001PN002PN90

36、2PN303PDM01PDM03PN105PN302NOTES) WarningNOTES) Parts that are shaded are criticalNOTES) With respect to risk of fire orNOTES) electricial shock.2-62-7BLOCK DIAGRAMAudio s/wBu 4052ADCCS 5340Fs = 48kHzFxDITCS 8406(slave)PS 9818(PWM)Video S/WNJM 2279out(CVBS-S/W)+SlideS/WVideoS/WNJM2279(Y-S/W)USB Contr

37、ollerALCBA 3308CS 5340ADCDVD BLOCK(ES 6698)Mic Volume : OSD CTLMIC1MIC2OpticalTunerAV1AV2(option)Monitor OutS-AVComponentScart(option)USB PortMIC7VWirelessLRVLRVGBRLRLRGBR816VSW1, SW2,MUTE1(A)Pb(R) ,Pr(R)CTL-A/B(B)VIDEO-SW(A)Tuner-L/RAV1-L/RAV2-L/RSCART-L/RAV1-CVBSAV2-CVBSMonitor outSCART-CVBS outCY

38、SCART-IDSCART-FB/RST-ADAD-DATAAD-BCKAD-LRCK(A)SPDIF12.288MHzLRCKBCKADAT 0,1,2,3(FL/R,RL/R, C/SW)MUTETR Mute /RST-AD(A)MixingALRCK,ABCKMCLK,AMDATSPDIF8406_SDI,8406_SDO8406_CLK,8406_CE8406_RST,8406_INTH/PY(G)YYYCDVD-CVBSCVBS(A)(T_CE,T_DO,T_DI,T_CLK,T_RDS_DATA,T_RDS,CLK)(A)AUDIO MICOMLC876B48(PIN MAP)

39、SSTOPTIONFRONTSTA510AAMP ICMIC1_DET(A)MIC2_DET(A)(A) HP_DETAMPDNTH_WFAN1FAN2(A)FAN1_CTLFAN2_CTLOPTION2-82-9SCHEMATIC DIAGRAMS 1. POWER SCHEMATIC DIAGRAM_1ABCDEFGHIJKLMNOPQRSTNOTES) WarningNOTES) Parts that are shaded are criticalNOTES) With respect to risk of fire orNOTES) electricial shock.2-102-11

40、2. POWER SCHEMATIC DIAGRAM_2ABCDEFGHIJKLMNOPQRST2-122-133. MICOM SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-142-154. FRONT SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-162-175. DSP& SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-182-196. I/O SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-202-217. MAIN MIC SCHEMATIC DIAGRA

41、MABCDEFGHIJKLMNOPQRST2-222-23PRINTED CIRCUIT BOARD DIAGRAMS1. MAIN/DVD P.C. BOARD DIAGRAM ( TOP VIEW )2-242-252. MAIN/DVD P.C. BOARD DIAGRAM ( BOTTOM VIEW )2-262-273. FRONT MIC P.C. BOARD6870R7507AA2-282-294. SMPS P.C. BOARD LOCATION GUIDENOTES) WarningNOTES) Parts that are shaded are criticalNOTES)

42、 With respect to risk of fire orNOTES) electricial shock.5. JACK P.C. BOARD( 5 TOOL )LOCATION GUIDENOTES) WarningNOTES) Parts that are shaded are criticalNOTES) With respect to risk of fire orNOTES) electricial shock.( 7 TOOL )( TOP VIEW )( BOTTOM VIEW )2-302-316. AMP P.C. BOARD( TOP VIEW )( BOTTOM

43、VIEW )3-1ELECTRICAL TROUBLESHOOTING GUIDE1. System operation flowPower OnNoYesYesYesNoNoNoShow LOGOTray Closed?Tray Close to Closed positionSLED Moves to Inner PositionRecieveOPEN/ CLOSEKey?ReceiveCLOSE Key?1. Stop Playback & Open Tray2. Display tray open message & LOGO1. Execute Pressed Key & IR Ke

44、y2. Systemoperati on Routi ne Loop1. Judge whether have disc and disc type2. Jump to related disc reading procedureSLED at InnerSide?1. 8082 initializes SERVO, DSP & RISC registers2. Write RISC code to SDRAM3. Reset RISCSECTION 3. DVD & AMP PART3-22. Test & debug flowTESTCheck the POWER PARTNoYesNoY

45、esNoNoYesYesCheck the POWER PARTCheck the regulators or diode.1. Check 27MHz system clock.2. Check systemreset circuit.3. Check FLASH R/Wenable signal PRD, RWR.4. Check FLASH Memory related circuit.Check theAC Vol tagePower PCBA (110Vor 220V)Switch on the Power PCBAAre 3.3V and 5V DCoutputs normal o

46、n mainPCBA?UpdateFLASHsuccessfully?Replace FLASHAIs the DCVoltage outputs OK? (-44V, -22V, -26.5V, 12V, 5.6V, 3.3V, 5V, 7V, 8V)3-3A, 115.3-4B1.2.3-5CES6698.ES6698.ES6698.3-6D3-7ECheck connection between IC300 ABCK, ALRCK,ASDATCheck the related circuit of PWM.(Check Audio out Pins52, 54, 55, 59,62, 6

47、8NormalPWM IC out?(IC301)PWM ICreceived correct datastream?Check Digital Amp circuit(IC701, IC702, IC703, IC704)3-83. AUDIO -COM Circuit(DVD & AMP)YESDoes CD/DVD appearat FLD?Does AV1, TV Audio, AV1 opt.and FM 87.5 appear at FLDOKDoes Loading appearat FLD?POWER ONYESNOYESDoes no Disc or Timeappear a

48、t FLD?NOYESNONONONONONODoes it appear DVD Errorat FLD?Refer to SMPS.Refer to oscillator Circuit.Check IC101 ResetWaveform.Check 3.3V line.Check Power sectionCircuit.NOCheck power part of MainB/D.Check oscillator of X101.Check if IC101 Pin80is high.Check if IC101 Pin32, 51,80 are high(5V).Check if IC

49、101 Pin96is high.Replace IC101.NONOCheck if DVD an AudioMicom Insert is OK.Check Power.YESCheck DVD Module.YESCheck SMPS.YESYESYESYESYESYESYES3-9DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL1) ES6698FD main clock is at 27MHz(X501)3.8V, 27MHzFIG 1-12)

50、ES6698FD reset is high active.PWR_CTL(SYSTEM -COM)IC501 PIN83)5.2VAPower Cord inM_RESET(IC501 PIN 207)URST(IC501 PIN 188)FIG 1-23-102. SDRAM CLOCK1) ES6698FD main clock is at 27MHz(X501)(IC503 PIN 38)DCLK = 93MHz, Vp-p=2.2, Vmax=2.7VFIG 2-13) Flash R/W enable signal during download(Downloading)FRD(I