LG-LHT551TB-cdk-sm 维修电路原理图.pdf

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1、DVD/CD & KARAOKE RECEIVERSERVICE MANUALMODELS : LH-TK551TB/LH-T551TBLHS-55TBC, LHS-55TBS, LHS-55TBWMODELS : LH-TK551TB/LH-T551TB LHS-55TBC, LHS-55TBS, LHS-55TBWSERVICE 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5S

3、ECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 BLOCK DIAGRAM . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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1-2SERV

7、ICING 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 pressure or impact.2. Repair notes1) The pick-up incorporates a str

8、ong 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 result may be an operational malfunction and/ordamage to the

9、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 the eyes!Absolutely never permit laser beams to enter the eyes!

10、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 camera lens). The lens is held by a delicate spring. When clean

11、ing 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 swab. (Do not use any other liquid cleaners, because they will

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

13、etCotton 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 easily affected by, static electricity. If such static electric

14、ity 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 temperature of humidity is high, whe

15、re 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 be covered with a conductive

16、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) Workers should be grounded b

17、y 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 NEVER be directly facing the eyes or bare skin.Resistor(1 Moh

18、m)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 Sensitive Devices (ESD). Examples of typical ESD devices are i

19、ntegratedcircuits 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 semiconductor component or semiconductor-equipped assembly, d

20、rain 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 power to the unit under test.2. After removing an electrical ass

21、embly 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 devices.4. Use only an anti-static solder removal device. Some sol

22、der 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 remove a replacement ESD device from its protective package until

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

24、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 when handing unpackaged replacement ESD devices. (Otherwise harm

25、less 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 APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, ISINTENDED TO ALER

26、T 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 PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERV

27、ICELITERATURE.1-5GENERALPower supply Refer to main labelPower consumption Refer to main labelMass 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 65

28、0 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 kHz, at 12W position) (20 kHz LPF/A-Filter)VIDEOVideo input 1.0

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

30、/(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 kHz or 520 - 1,720 kHzIntermediate Frequency 450 kHzAMPLIFIER(

31、LH-TK551TB/LH-T552TB)Stereo mode 70W + 70W (8 at 1 kHz, THD 10 %)Surround mode Front: 70W + 70W (THD 10 %)Centre*: 70WSurround*: 70W + 70W (8 at 1 kHz, THD 10 %)Subwoofer*: 150W (4 at 30 Hz, THD 10 %)SPEAKERSSatellite Speaker Centre speaker Passive Subwoofer(LHS-55TBS) (LHS-55TBC) (LHS-55TBW)Type 1

32、Way 2 Speaker 1 Way 2 Speaker 1 Way 1 SpeakerImpedance 8 8 4 Frequency Response 150 - 20,000 Hz 150 - 20,000 Hz 40 - 1,500 HzSound Pressure Level 86 dB/W (1m) 86 dB/W (1m) 82 dB/W (1m)Rated Input Power 70 W 70 W 150 WMax. Input Power 140 W 140 W 300 WNet Dimensions(WxHxD)280 x 1200 x 280 mm 500 x 83

33、 x 90 mm 195 x 402 x 360 mmNet Weight 2.38kg 0.71kg 6.2kg(* 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+:

34、 +5.0CN902CN9022-33. FRONT CIRCUIT (2/2)2-42-5WIRING DIAGRAMWIRELESSOPTICALINSCART JACKOPTION SWAV1,2COMPONENTMONITOR OUTS-VIDEO OUTTUNERSPEAKER TERMINALMAIN PCBAMP PCBSMPS PCBMDFRONT PCBFRONT PCBMIC&USB PCBVFDH/P JACKUSB JACKMICJACKMICJACKCN001PN005CN350PN8016PIN5PIN23PIN11PIN24PIN23PIN14PIN14PIN30

35、PINPN103PN104PN001PN002PN902PN303PDM01PDM03PN105PN3022-62-7BLOCK 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(o

36、ption)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_1ABCDEFGHIJKLMNOPQRST2-102-112. POWER SCHEMATIC DIAGRAM_2ABCDEFGHIJKLMNOPQRST2-122-133. MICOM SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-142-154. FRONT SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-162-175. DSP& SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQR

39、ST2-182-196. I/O SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-202-217. MAIN MIC SCHEMATIC DIAGRAMABCDEFGHIJKLMNOPQRST2-222-23PRINTED 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. BOARD2-282-294. SMPS P.C. BO

40、ARD LOCATION GUIDE5. MIC P.C. BOARD(OPTIONAL PART)( 5 TOOL )LOCATION GUIDE( 7 TOOL )( TOP VIEW )( BOTTOM VIEW )2-302-316. AMP P.C. BOARD( TOP VIEW )( BOTTOM VIEW )( TOP VIEW )( 5 TOOL )( 7 TOOL )( BOTTOM VIEW )3-1ELECTRICAL TROUBLESHOOTING GUIDE1. System operation flowPower OnNoYesYesYesNoNoNoShow L

41、OGOTray 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 Routi ne Loop1. Judge whether have disc and disc type2. Jump to related dis

42、c 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 POWER PARTCheck the regulators or diode.1. Check 27MHz system clock.2. Che

43、ck 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 PCBAIs theDC Voltageoutputs OK? (-44V, -22V, -26.5V, 12V, 5.6V, 3.3V, 5V, 7V, 8V)Is 3.3V and 5V DCoutputs normal on mainPCBA?UpdateFLA

44、SHsuccessfully?Replace FLASHA3-3A, 115.3-4B3-5CES6698.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)PWM ICreceived correct datastream?Check Digital Amp circuit(IC701, IC702, IC7

45、03, IC704)3-83. AUDIO -COM Circuit(DVD & AMP)YESDoes CD/DVD appearat FLD?Does CD/DVD appearat FLD?OKDoes Loading appearat FLD?POWER ONYESYESYESDoes no Dise or Timeappear at FLD?NONONONONONONONODoes it appear DVD Errorat FLD?Refer to SMPS.Refer to oscillator Circuit.Check IC101 ResetWaveform.Check 3.

46、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 IC101.NONOCheck if DVD an AudioMicom Insert is OK.Check Power.YESCheck DVD Module.YESCheck SMPS.YESYESYES

47、YESYESYESYES3-9DETAILS 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 active.PWR_CTL(SYSTEM -COM)IC501 PIN83)5.2VAPower Cord inM_RESET(IC501 PIN 207)URST(IC501 PIN 188)FIG 1-23-

48、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 PIN 11)FIG 1-43-113. TRAY OPEN/CLOSE SIGNAL1) Tray open/close waveformOPEN(PDM03 PIN7)CLOSE(PDM03 PIN8)TROPE

49、N(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 CONDITION)FMSO(2.0V/1.4V/1.0V)(IC501 PIN 19)STBY(5V) (IC401 PIN 50)SL+(4.7V/3.6V/1.9V)(IC404 PIN 12)SL-(5.3V/3.7V/

50、2.5V)(IC404 PIN 11)FIG 4-13) Tray open waveformOPEN(PDM03 PIN7)CLOSE(PDM03 PIN8)TROPEN(IC402 PIN 4)TRCLOSE(IC402 PIN 5)FIG 3-33-135. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)FOSO(1.5V/1.4V/1.3V)(IC501 PIN 12)F+(4.0V/3.6V/3.2V)(IC404 PIN 14)F-(4.0V/3.6V/3.2V)(IC404 PIN 13)FIG 5-16. LASER POWER C