LG-LHT552SB-cdr-sm 维修电路原理图.pdf

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1、DVD/CD RECEIVERSERVICE MANUALMODEL : LH-T552SBLHS-55SBC, LHS-55SBS, LHS-55SBWMODEL : LH-T552SB LHS-55SBC, LHS-55SBS, LHS-55SBWSERVICE MANUALRadioFans.CN 收音机爱 好者资料库1-1CONTENTSSECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5SECTION 2. AUDIO PART AUDIO TROUBL

3、ESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22SECTI

5、ON 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . . . . . . . .4-1SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1RadioFans.CN 收音机爱 好者资料库1-2SERVICING PRECAUTIONSNOTES REGARDING

7、 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 pressure or impact.2. Repair notes1) The pick-up incorporates a strong magnet, and so should never

8、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 result may be an operational malfunction and/ordamage to the printed-circuit board.3) Each an

9、d 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 the eyes!Absolutely never permit laser beams to enter the eyes!Also NEVER switch ON the power t

10、o 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 camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore,

11、 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 swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not

12、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 other exposed skin.MagnetHow to hold the pick-upConductive SheetCotton swabPressurePressureSEC

13、TION 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 easily affected by, static electricity. If such static electricity is high voltage, componentsc

14、an 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 temperature of humidity is high, where strong magnet-ism is present,

15、 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 be covered with a conductive sheet and grounded.When removing

16、 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) Workers should be grounded by an armband (1M )6) Care should

17、 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 NEVER be directly facing the eyes or bare skin.Resistor(1 Mohm)ConductiveSheetResistor(1 Mohm

18、)Armband1-4ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integratedcircuits and some field

19、-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 semiconductor component or semiconductor-equipped assembly, drain offany electrostatic charge

20、 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 power to the unit under test.2. After removing an electrical assembly equipped with ESD devices,

21、 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 devices.4. Use only an anti-static solder removal device. Some solder removal devices not classifi

22、ed 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 remove a replacement ESD device from its protective package until immediately before you areready

23、 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 protective material from the leads of a replacement ESD device, touch theprotective material to

24、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 when handing unpackaged replacement ESD devices. (Otherwise harmless motionsuch as the brushing

25、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 APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, ISINTENDED TO ALERT THE SERVICE PERSONNEL TO THE P

26、RESENCE 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 PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.1-5GENERALPower su

27、pply 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 humidity 5% to 85%CD/DVDLaser Semiconductor laser, wavelength 650 nmSignal system PAL 625/50,

28、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 kHz, at 12W position) (20 kHz LPF/A-Filter)VIDEOVideo input 1.0 V (p-p), 75 , negative sync.,

29、 RCA jack x 1Video output 1.0 V (p-p), 75 , negative sync., RCA jack x 1S-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 Video 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

30、 - 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 kHz or 520 - 1,720 kHzIntermediate Frequency 450 kHzAMPLIFIERStereo mode 70W + 70W (8 at 1 kHz, THD 10 %)Surround mode Fro

31、nt: 70W + 70W (THD 10 %)Center*: 70WSurround*: 70W + 70W (8 at 1 kHz, THD 10 %)Subwoofer*: 150W (4 at 30 Hz, THD 10 %)InputAV INOutputsS-VIDEO, MONITOR, PHONES: (32 , 10.V)SPEAKERSFront SpeakerCenter SpeakerSubwooferType1 Way 1 Speaker1 Way 1 Speaker1 Way 1 SpeakerImpedance8 8 4 Frequency Response11

32、0 - 20,000 Hz110 - 20,000 Hz40 - 1,500 HzSound Pressure Level82 dB/W (1m)82 dB/W (1m)82 dB/W (1m)Rated Input Power70W70W150WMax. Input Power140W140W300WNet Dimensions140 x222x153 mm300 x116x91 mm195x402x360 mmNet Weight0.95 kg1.0 kg5.6 kg(* Depending on the sound modesettings and the source, therema

33、y 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 CIRCUIT (2/2)2-42-5WIRING DIAGRAMWIRELESSOPTICALINSCART JACKOPTION SWAV1,2COMPONENTMONITOR O

34、UTS-VIDEO OUTTUNERSPEAKER TERMINALMAIN PCBAMP PCBSMPS PCBMDFRONT PCBFRONT PCBMIC&USB PCBVFDH/P JACKUSB JACKMICJACKMICJACKCN001PN005CN350PN8016PIN5PIN23PIN11PIN24PIN23PIN14PIN14PIN30PINPN103PN104PN001PN002PN902PN303PDM01PDM03PN105PN302NOTES) WarningNOTES) Parts that are shaded are criticalNOTES) With

35、 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 ControllerALCBA 3308CS 5340ADCDVD BLOCK(ES 6698)Mic Volume : OSD CTLMIC1MIC2OpticalTunerAV1AV2(op

36、tion)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 outCYSCART-IDSCART-FB/RST-ADAD-DATAAD-BCKAD-LRCK(A)SPDIF12.288MHzLRCKBCKADAT 0,1,2,3(FL/R,RL/R, C

37、/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) SSTOPTIONFRONTSTA510AAMP ICMIC1_DET(A)MIC2_DET(A)(A) HP_DETAMPDNTH_WFAN1FAN2(A)FAN1_CTLFAN2_

38、CTLOPTION2-82-9SCHEMATIC DIAGRAMS 1. POWER SCHEMATIC DIAGRAM_1NOTES) Symbol denotes AC ground.NOTES) Symbol denotes DC chassis ground.NOTE) WarningNOTE) Parts that are shaded are criticalNOTE) With respect to risk of fire orNOTE) electricial shock.ABCDEFGHIJKLMNOPQRST2-102-112. POWER SCHEMATIC DIAGR

39、AM_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 DIAGRAMABCDEFGHIJKLMNOPQRST2-2

40、22-23PRINTED 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. BOARD6870R7507AB2-282-294. SMPS P.C. BOARD LOCATION GUIDENOTES) WarningNOTES) Parts that are shaded are criticalNOTES) With respect to risk of

41、 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 VIEW )3-1ELECTRICAL TROU

42、BLESHOOTING 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 Key2. Systemoperati on Rou

43、ti 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 PARTNoYesNoYesNoNoYesYesCheck the PO

44、WER 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 on mainPCBA?UpdateFLASHsu

45、ccessfully?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, 68NormalPWM IC out?(IC301

46、)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 at FLD?NOYESNONONONONONOD

47、oes 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 IC101 Pin96is high.Replace

48、 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) ES6698FD reset is high a

49、ctive.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 2-14) Flash R/W enable signal during download(Downloading)FRD(IC500 PIN 28)FWR(IC500 PI

50、N 11)FIG 1-43-113. TRAY OPEN/CLOSE SIGNAL1) Tray open/close waveformOPEN(PDM03 PIN7)CLOSE(PDM03 PIN8)TROPEN(IC402 PIN 4)TRCLOSE(IC402 PIN 5)FIG 3-12) Tray close waveformOPEN(PDM03 PIN7)CLOSE(PDM03 PIN8)TROPEN(IC402 PIN 4)TRCLOSE(IC402 PIN 5)FIG 3-23-124. SLED CONTROL RELATED SIGNAL (NO DISC CONDITIO