LG-HT302SD-sur-sm 维修电路原理图.pdf

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1、MODEL : HT302SD(SH32SD-S/SH32SD-W)SERVICE MANUALP/NO : AFN31640725NOVEMBER, 2006DVD/CD RECEIVERSERVICE MANUALMODEL : HT302SD(SH32SD-S/SH32SD-W)http:/RadioFans.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 SPECIFICATIONS . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD & AMP CIRCUIT DIAGRAMS . . . . . . . . . .

6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1SECTION 6. REPLACEMENT PART

7、S LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 n

8、ever 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 pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it is subjecte

9、d 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 to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely never be

10、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-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned away by u

11、sing 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 distort this.6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply i

12、sopropyl 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 not allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look directly at the laser beam, a

13、nd dont let contact fingers or other 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 com

14、ponentsare sensitive to, and easily 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 b

15、etaken, therefore, to avoid repair 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

16、instruments and tools must be grounded.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 leak

17、age, the metal part of the soldering 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 prevent sta-tic electricity changes in the clothing to escape from the armband.7) The la

18、ser beam from the pick-up should 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 componentscommon

19、ly 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 component damage caused by static electricity.1.

20、 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 strap device, which should be removed for potential s

21、hock 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 assembly.3. Use only a grounded-tip soldering iro

22、n 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. These can generate electrical charges sufficient to

23、 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, aluminum foil or comparable conductive materials).7. Im

24、mediately 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 OR CIRCUIT, AND OBSERVE ALL OTHERSAFETY PRECAUTIO

25、NS.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 to damage an ESD device).CAUTION. GRAPHIC SYMBOL

26、STHE 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 EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS I

27、NTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.1-5SERVICE INFORMATION FOR EEPROM (DVD PART)POWER ONDVD LOGO Status (NO Disk status)Remotecontrol Pause key-1-4-7-2 in order.Press number 09, Press charaterAF (16 for a while)Use arrow key ( )

28、tomove to approprite position andmake changesPress pause key onceChange will be applied when powerOFF-ON.NAMEOPT 1OPT 2OPT 3OPT 4OPT 5OPT 6OPT 7OPT 8OPT 9OPT AOPT BOPT COPT DOPT EOPT FOPT GHEX00000000000000000000000000000000DETECT NEW EEPROM(OPTION EDIT SCREEN)Refer to page 6-1 1-6SERVICE INFORMATIO

29、N FOR EEPROM (MICOM PART)POWER ONFLD no disc statusRemotecontroller 2 + Front STOPpush same timing during 5sFLD 00.Use arrow key ( ) moveto appropriate position and makechangesPress ENTER key onceFLD write ok or up okRemotecontroller 2 + Front STOPpush same timingFLD display E2P CLR or EP CLRAuto po

30、wer offNAMEHEX008601C2021003000400DETECT NEW EEPROM(OPTION EDIT SCREEN)1-7SPECIFICATIONSGENERALPower supplyRefer to main labelPower consumptionRefer to main labelNet Weight2.4 kgExternal dimensions (W x H x D)360 x 63 x 307 mmOperating conditionsTemperature: 5C to 35C, Operation status: HorizontalOp

31、erating humidity5% to 85%CD/DVDLaserSemiconductor laser, wavelength 650 nmSignal systemPAL 625/50, NTSC 525/60Frequency response (audio)160 Hz to 18 kHzSignal-to-noise ratio (audio)More than 75 dB (1 kHz, NOP -6 dB, 20 kHz LPF/A-Filter)Dynamic range (audio)More than 70 dBHarmonic distortion (audio)0

32、.5 % (1 kHz, at 1W position) (20 kHz LPF)VIDEOVideo output1.0 V (p-p), 75 , negative sync./ SCART (TO TV)COMPONENT VIDEO OUT(Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1(Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 1TUNERFMTuning Range87.5 - 108.0 MHz or 65.0 - 74.0 MHz, 87.5 - 108.0 MHzInterme

33、diate Frequency10.7 MHzSignal-to Noise Ratio60 dB (Mono)Frequency Response160 - 8,000 HzAM MWTuning Range522 - 1,620 kHz or 520 - 1,720 kHzIntermediate Frequency450 kHzAMPLIFIERStereo mode45W + 45W (Rated Output Power 30W, 4at 1 kHz, THD 10 %)Surround modeFront: 45W + 45W (Rated Output Power 30W, TH

34、D 10 %)Centre*: 45WSurround*: 45W + 45W (Rated Output Power 30W, 4at 1 kHz, THD 10 %)Subwoofer*: 75W (Rated Output Power 60W, 8at 30 Hz, THD 10 %)InputsAUX IN, MICSPEAKERSFront/Center/Rear SpeakerPassive Subwoofer(SH32SD-S)(SH32SD-W)Type1 Way1 Speaker1 Way1 SpeakerImpedance4 8 Frequency Response160

35、- 20,000Hz 65 - 1,500 HzSound Pressure Level84 dB/W (1m)87 dB/W (1m)Rated Input Power45 W75 WMax. Input Power90 W150 WNet Dimensions (W x H x D)98 x 101 x 105 mm181 x 351 x 278 mmNet Weight0.52kg3.4kg(* Depending on the sound modesettings and the source, there maybe no sound output.)2-1SECTION 2. AU

36、DIO PARTAUDIO TROUBLESHOOTING GUIDE1. POWER SUPPLY CIRCUIT2-22. FRONT CIRCUIT (1/2)CHECK IF THE P1301 IS OK?CHECK IF THE RM301 IS OK?2-33. FRONT CIRCUIT (2/2)CHECK IFR345 R350OK.REPLACER345 R350.Check ifthe Remoconwaceform of theP3101 pin 11is OKCheck ifthe RM301voltage is OK(5V)Resoldering or Repla

37、ce RM3012-42-5WIRING DIAGRAM0610262-62-7BLOCK DIAGRAM061026061026IMPORTANT SAFETY NOTICEWHEN SERVICING THIS CHASSIS, UNDER NO CIR-CUMSTANCES SHOULD THE ORIGINAL DESIGN BEMODIFIED OR ALTERED WITHOUT PERMISSIONFROM THE LG CORPORA TION. ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPESIDENTICAL TO THOS

38、E IN THE ORIGINAL CIR- CUIT.SPECIALCOMPONENTS ARE SHADED ON THESCHEMATIC FOR EASY IDENTIFICATION.THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF-FER FROM THE ACTUAL CIRCUIT USED. THIS WAY,IMPLEMENTATION OF THE LATEST SAFETY ANDPERFORMANCE IMPROVEMENT CHANGES INTOTHE SET IS NOT DELAYED UNTILTHE NEW SERVICE

39、LITERATURE IS PRINTED.NOTE : 1. Shaded( ) parts are critical for safety. Replace only with specified part number.2. Voltages are DC-measured with a digital voltmeterduring Play mode.NOTE) WarningNOTE) Parts that are shaded are criticalNOTE) With respect to risk of fire orNOTE) electricial shock.NOTE

40、S) Symbol denotes AC ground.NOTES) Symbol denotes DC chassis ground.2-82-9CIRCUIT DIAGRAMS 1. SMPS(POWER) CIRCUIT DIAGRAM 2-102-112. -COM(MAIN) CIRCUIT DIAGRAM 0610262-122-133. MOTOR & SERVO CIRCUIT DIAGRAM 0610262-142-154. I/O CIRCUIT DIAGRAM 0610262-162-175. MIC CIRCUIT DIAGRAM0610262-182-196. FRO

41、NT JACK CIRCUIT DIAGRAM0610262-202-217. FRONT CIRCUIT DIAGRAM(WITH RDS)0610262-222-238. FRONT CIRCUIT DIAGRAM(WITHOUT RDS)0610262-242-25PRINTED CIRCUIT BOARD DIAGRAMS1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW )2-262-272. MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW )2-282-293. SMPS P.C. BOARDNOTE:WarningParts t

42、hat are shaded are critical Withrespect to risk of fire or electrical shock.2-302-314. FRONT JACK P.C BOARD5. FRONT P.C. BOARD(WITH RDS)3-1ELECTRICAL TROUBLESHOOTING GUIDE1. System operation flowPower OnNoYesYesYesNoNoNoShow LOGOTray Closed?Tray Close to Closed positionSLED Moves to Inner PositionRe

43、cieveOPEN/ 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 disc reading procedureSLED at InnerSide?1. Initializes SERVO, DSP & RISC regi

44、sters2. 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. Check systemreset circuit.3. Check FLASH R/Wenable signal PRD, RWR.4. Check FLASH M

45、emory related circuit.Check theAC Vol tagePower PCBA (110Vor 220V)Switch on the Power PCBAIs theDC Voltageoutputs OK? (12V, 5.6V,3.5V, 5V,7V, 34V)Are 3.5V and 5V DCoutputs normal on mainPCBA?UpdateFLASHsuccessfully?Replace FLASHA3-3AES8380Check the related circuit of ES8380 IC501 Pins133, 134, 137,

46、138, 139, 140Check the Tray control IO pins on ES8380.Check the Tray control amplifyungcircuit IC401.Check connection lines between SDRAM(IC502) & ES8380 and the SDRAM is damaged. ES8381VIDEO outputsproperly?NormalOPEN_SW, CLOSE_SWsignal?3-4BMotor Driver DRV_MUTE pin is High?Motor Driver DRV_MUTE pi

47、n is High?SLED+ and SLED- output properly?Check the connection line of DRV_MUTECheck the related circuit of SLEGNCheck Focus connection on ES8381 and motor driver.3-5CES8380.Check the laser power circuit on ES8380 and connecting to power transistor.(Q405, Q406)Collectorvoltage of powertransistor is

48、OK?(Q405, Q406)ProperRF signal on ES8380ProperSPINDLE signal on ES8380SPNP SPNN output properly?Check the related circuit on ES8380 RF signal.Check the RF connectionbetween IP9009 and ES8380.3-6DProper signals on A, B, C, D of ES8380Proper CD-DVDCT signal on ES8380Proper CD-DVDCT signal on ES8380Pro

49、perTRACK signal on ES8380TR+ & TR- output properly?Check CD_DVDCT connectionbetween IP9009 and ES8380Check the related circuit on ES8380 CD-DVDCTCheck connections betweenES8380 and pick-up head.Check the related circuit on ES8380.Check the TRACK connection on ES8380 and motor driver.3-7ECheck connec

50、tion between IC701 BCK, LRCK, ADATAOCheck the related circuit of PWM.(Check Audio out Pins54, 55, 58, 59, 61, 62,67, 68, 70, 71, 74, 75NormalPWM IC out?(IC701)PWM ICreceived correct datastream?Check Digital Amp circuit(IC702, IC703)3-83. AUDIO -COM Circuit(DVD & AMP)YESDoes CD/DVD appearat FLD?Does