LG-LHT2660xx-cdr-sm 维修电路原理图.pdf

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1、DVD/CD RECEIVERSERVICE MANUALMODELS : LH-T2645(X)/LH-TK2645(X)/LH-T2665(X)/LH-TK2665(X)/LH-T2660(X)/LH-TK2660(X)SERVICE MANUALP/NO : AFN31220002AUGUST, 2006MODELS : LH-T2645(X)/LH-TK2645(X)/LHS-26SGS/26SGWLH-T2665(X)/LH-TK2665(X)/LHS-26SQS/26SQWLH-T2660(X)/LH-TK2660(X)/LHS-26SHS/26SHWLH-T2645(X)/LH-

2、TK2645(X)LH-T2665(X)/LH-TK2665(X)LH-T2660(X)/LH-TK2660(X)RadioFans.CN 收音机爱 好者资料库1-1CONTENTSSECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SERVICE INFORMATION FOR EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6SECTION

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

5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、 . . . . . . . . . . 2-28SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD & AMP CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 PRINTED CIRCUIT DIARGAMS . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1SECTI

8、ON 6. REPLACEMENT PARTS 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

9、) 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 pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimp

10、act. 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 to a high degree of precision, and for that reasonthe adjustment point and installation screws shoul

11、d 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-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust shoul

12、d 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 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

13、 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 not allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look dir

14、ectly at the laser beam, and 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-

15、up (laser diode). These componentsare 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-precis

16、ion components. Care must betaken, 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

17、) All equipment, measuring 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 electri

18、city.)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 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 f

19、rom 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)Armband1-4ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electrici

20、ty. 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 component damage caused

21、 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 strap device, which should b

22、e 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 assembly.3. Use only a g

23、rounded-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. These can generate electri

24、cal 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, aluminum foil or comparable co

25、nductive 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 OR CIRCUIT, AND OBSERVE

26、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 to damage an ESD device

27、).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 EXCLAMATION POINT WITHIN AN

28、 EQUILATERAL TRIANGLE IS INTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.1-5SERVICE INFORMATION FOR EEPROMPOWER 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

29、 arrow key ( ) tomove to approprite position andmake changesPress pause key onceChange will be applied when powerOFF-ON.* OPTION NTSC model doesnt have VCR option and use DVD option BF as VCR option. (only DVD exist) PAL model has another separate VCR option. (Both VCR and DVD exist)NAMEHEXOPT 155OP

30、T 241OPT 340OPT 4FFOPT 552OPT 605OPT 7F8OPT 831OPT 90COPT A00OPT B00OPT C00OPT D00OPT E00OPT F00OPT G00DETECT NEW EEPROM(OPTION EDIT SCREEN)* Refer to page 6-1.1-6SPECIFICATIONSGENERALPower supply Refer to main labelPower consumption Refer to main labelNet Weight 3.9 kgExternal dimensions (W x H x D

31、)430 x 57 x 295 mmOperating conditions Temperature: 5C to 35C, Operation status: HorizontalOperating humidity 5% to 85%CD/DVDLaser Semiconductor laser, wavelength 650 nmSignal system PAL 625/50, NTSC 525/60Frequency response (audio) 150 Hz to 18 kHzSignal-to-noise ratio (audio) More than 75 dB (1 kH

32、z, NOP -6 dB, 20 kHz LPF/A-Filter)Dynamic 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)TUNERFMTuning Range 87

33、.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 Frequency 450 kHzAMPLIFIER(LH-T26s)Stereo mode Front: 30 W + 30 W (THD 10 %)Centre*: 3

34、0 WSurround*: 30 W + 30 W (6 at 1 kHz, THD 10 %)Subwoofer*: 70 W (8 at 30 Hz, THD 10 %)InputAUX IN, MICOutputsMONITOR, PHONES: (32 , 1.0 V)SPEAKERS(LHS-26SG)Satellite SpeakerPassive SubwooferType1 Way 1 Speaker1 Way 1 SpeakerImpedance6 8 Frequency Response130 - 20,000 Hz 50 - 1,500 HzSound Pressure

35、Level83 dB/W (1m) 82 dB/W (1m)Rated Input Power30W 70WMax. Input Power60W 140WNet Dimensions88 x 100 x 95 mm 160 x 350 x 325 mmNet Weight0.54 kg 4.12 kg(* Depending on the sound modesettings and the source, there maybe no sound output.)1-7SPEAKERS(LHS-26SH)Satellite SpeakerPassive SubwooferType 1 Wa

36、y 1Speakers1 Way 1SpeakerImpedance 6 8 Frequency Response 130 - 20,000 Hz 50 - 1,500 HzSound Pressure Level 130 - 20,000 Hz 50 - 1,500 HzRated Input Power 30W 70WMax Input Power 60W 140WNet Dimensions 88 x 100 x 95 mm 160 x 350 x 325 mmNet Weight 0.54 kg 4.12 kgSPEAKERS(LHS-26SQ)Satellite SpeakerPas

37、sive SubwooferType1 Way 1 Speaker1 Way 1 SpeakerImpedance6 8 Frequency Response130 - 20,000 Hz 50 - 1,500 HzSound Pressure Level83 dB/W (1m) 82 dB/W (1m)Rated Input Power30W 70WMax. Input Power60W 140WNet Dimensions88 x 100 x 95 mm 160 x 350 x 325 mmNet Weight0.54 kg 4.12 kg2-1SECTION 2. AUDIO PARTA

38、UDIO TROUBLESHOOTING GUIDE1. POWER SUPPLY CIRCUIT2-22. FRONT CIRCUIT (1/2)PIN2PIN1PIN3PIN12: -22 FL+: -41 VKK: -26.5 FL-: +5.0P1301Short 1pin of CN901 with 4pin of CN901 in SMPS part.CHECK IF THE P1301 IS OK?CHECK IF THE DIS301 IS OK?2-33. FRONT CIRCUIT (2/2)CHECK IFR345 R350, R154OK.REPLACER345 R35

39、0, R154.Check ifthe Remoconwaceform of theP3101 pin 10is OKCheck ifthe RM301voltage is OK(5V)Resoldering or Replace RM3012-42-5WIRING DIAGRAM2-62-7BLOCK DIAGRAM2-82-9CIRCUIT DIAGRAMS 1. SMPS(POWER) CIRCUIT DIAGRAMNOTES) Symbol denotes AC ground.NOTES) Symbol denotes DC chassis ground.NOTE) WarningNO

40、TE) Parts that are shaded are criticalNOTE) With respect to risk of fire orNOTE) electricial shock.A123456789101112BCDEFGHIJKLMNOPQRST2-102-112. POWER INTERFACE CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-122-133. -COM(MAIN) CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-142-154. SERVO

41、CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-162-175. I/O CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-182-196. MIC CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-202-217. USB CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-222-238. MIC & USB CIRCUIT DIAGRAMA123456789101112BCD

42、EFGHIJKLMNOPQRST2-242-259. HDMI CIRCUIT DIAGRAM(OPTIONAL PART)A123456789101112BCDEFGHIJKLMNOPQRST2-262-2710. FRONT CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-282-29PRINTED CIRCUIT BOARD DIAGRAMS1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW )2-302-312. MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW )2-322-33

43、3. SMPS P.C. BOARD2-342-354. KEY P.C. BOARD5. TIMER P.C. BOARD( BOTTOM VIEW )( TOP VIEW )( TOP VIEW )( BOTTOM VIEW )3-1ELECTRICAL TROUBLESHOOTING GUIDE1. System operation flowPower OnNoYesYesYesNoNoNoShow LOGOTray Closed?Tray Close to Closed positionSLED Moves to Inner PositionRecieveOPEN/ CLOSEKey?

44、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. 8082 initializes SERVO, DSP & RISC registers2. Write R

45、ISC 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 Memory related

46、circuit.Check theAC Vol tagePower PCBA (110Vor 220V)Switch on the Power PCBAIs theDC Voltageoutputs OK? (-41V, -22V, -26.5V, 12V, 5.6V, 3.3V, 5V, 7V, 32.5V)Are 3.3V and 5V DCoutputs normal on mainPCBA?UpdateFLASHsuccessfully?Replace FLASHA3-3AES8381Check the related circuit of ES8381 IC501 Pins133,

47、134, 137, 138, 139, 140Check the Tray control IO pins on ES8381.Check the Tray control amplifyungcircuit IC401.Check connection lines between SDRAM(IC502) & ES8381 and the SDRAM is damaged. ES8381VIDEO outputsproperly?NormalOPEN_SW, CLOSE_SWsignal?3-4BMotor Driver DRV_MUTE pin is High?Motor Driver D

48、RV_MUTE pin 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.3-5CES8381.Check the laser power circuit on ES8381 and connecting to power transistor.(Q405, Q406)Collectorvoltage of powertran

49、sistor is OK?(Q405, Q406)ProperRF signal on ES8381ProperSPINDLE signal on ES8381SPNP SPNN output properly?Check the related circuit on ES8381 RF signal.Check the RF connectionbetween IP9009 and ES8381.3-6DProper signals on A, B, C, D of ES8381Proper CD-DVDCT signal on ES8381Proper CD-DVDCT signal on

50、 ES8381ProperTRACK signal on ES8381TR+ & TR- output properly?Check CD_DVDCT connectionbetween IP9009 and ES8381Check the related circuit on ES8381 CD-DVDCTCheck connections betweenES8381 and pick-up head.Check the related circuit on ES8381.Check the TRACK connection on ES8381 and motor driver.3-7ECh