LG-LHT760IA-cdr-sm 维修电路原理图.pdf

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1、DVD/CD RECEIVERSERVICE MANUALMODELS : XH-T9650X/XH-T7650X/LH-T7652IA/XH-TK9650Q/LH-T9656IA/LH-T760IASERVICE MANUALMODELS : XH-T9650X/XH-T7650X/LH-T7652IA/XH-TK9650Q/LH-T9656IA/LH-T760IARadioFans.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 SPECIFICA

3、TIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6SECTION 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD & AMP CIRCU

6、IT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7、 . . . . . . . .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 HANDLING OF THE PICK

8、-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 be brought close to m

9、agnetic 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 and every pick-up is al

10、ready 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 to the laser output pa

11、rt (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, a cot-ton swab shoul

12、d 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 to use too muchof thi

13、s 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 swabPressurePressureSECTION 1. GENERAL1-3NOT

14、ES 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, componentscan be damaged, and fo

15、r 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, or where there is ex

16、cessive 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 the laser pick-up fr

17、om 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 be taken not to perm

18、it 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)Armband1-4ESD PRECAU

19、TIONSElectrostatically 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-effect transistors a

20、nd 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 on your body by touc

21、hing 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, place the assembly o

22、n 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 classified as anti-static can

23、generate 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 to install it. (Most

24、 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 the chassis or circui

25、t 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 together of your clot

26、hes 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 PRESENCE OF UNINSULATE

27、D “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.1-5SERVICE INFORMATION FOR EEPROMPOWER

28、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 ( ) tomove to approprite position andmake changesPress pause key onceChange will be applied when powerOFF-ON.* OPTION NTSC model doesnt have VCR option and use D

29、VD option BF as VCR option. (only DVD exist) PAL model has another separate VCR option. (Both VCR and DVD exist)NAMEHEXOPT 100OPT 200OPT 300OPT 400OPT 500OPT 600OPT 700OPT 800OPT 900OPT A00OPT B00OPT C00OPT D00OPT E00OPT F00OPT G00DETECT NEW EEPROM(OPTION EDIT SCREEN)1-6SPECIFICATIONS(* Depending on

30、 the sound modesettings and the source, there maybe no sound output.)GENERALPower supply Refer to main labelPower consumption Refer to main labelNet Weight 3.9 kgExternal dimensions (W x H x D)430 x 57 x 295 mmOperating conditions Temperature: 5C to 35C, Operation status: HorizontalOperating humidit

31、y 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 kHz, NOP -6 dB, 20 kHz LPF/A-Filter)Dynamic range (audio) More than 70 dBHarmonic distortion (audio) 0.5 % (1

32、kHz, at 1W position) (20 kHz LPF)VIDEOVideo output 1.0 V (p-p), 75 , negative sync., SCART (TO TV)TUNERFMTuning 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 - 8,000 HzAM MWTuning Range 522 - 1,620 k

33、Hz or 520 - 1,720 kHzIntermediate Frequency 450 kHzAMPLIFIER(LH-T36s)Stereo mode 45W + 45W (Rated Output Power 30W, 4 at 1 kHz, THD 10 %)Surround mode Front: 45W + 45W (Rated Output Power 30W, THD 10 %)Center*: 45WSurround*: 45W + 45W(Rated Output Power 30W, 4 at 1 kHz, THD 10 %)Subwoofer*: 75W (Rat

34、ed Output Power 60W, 8 at 30 Hz, THD 10 %)InputAUX INOutputsMONITOR, PHONES: (32 , 1.0 V)SPEAKERS(LHS-36SE)Front/Rear/Center SpeakerPassive Subwoofer(LHS-36SES) (LHS-36SEW)Type 1 Way 1 Speaker 1 Way 1 SpeakerImpedance 4 8 Frequency Response 150 - 20,000 Hz 65 - 1,500 HzSound Pressure Level 85 dB/W (

35、1m) 87 dB/W (1m)Rated Input Power 45 W 75 WMax. Input Power 90 W 150 WNet Dimensions (W x H x D) 105 x 99 x 83 mm 175 x 351 x 270 mmNet Weight 0.45kg 3.4kg1-7(* Depending on the sound modesettings and the source, there maybe no sound output.)AMPLIFIER(LH-T76s)Stereo mode100W + 100W (Rated Output Pow

36、er 100W, 4 at 1 kHz, THD 10 %)Surround modeFront: 100W + 100W (Rated Output Power 100W, THD 10 %)Centre*: 100WSurround*: 100W + 100W (Rated Output Power 100W, 4 at 1 kHz, THD 10 %)Subwoofer*: 200W (Rated Output Power 150W, 3 at 30 Hz, THD 10 %)Inputs AV IN, MIC (OPTIONAL)Outputs S-VIDEO, MONITOR, PH

37、ONES: (32 , 1.0 V)SPEAKERS(LHS-76IB)Front/Rear SpeakerCenter speaker Passive Subwoofer(XHS-76IBS) (XHS-76IBC) (XHS-76IBW)Type 2 Way 3 Speaker 2 Way 3 Speaker 1 Way 1 SpeakerImpedance 4 4 3 Frequency Response 150 - 20,000 Hz 150 - 20,000 Hz 40 - 1,500 HzSound Pressure Level 88 dB/W (1m) 88 dB/W (1m)

38、85 dB/W (1m)Rated Input Power 100 W 100 W 200 WMax. Input Power 200 W 200 W 400 WNet Dimensions(W x H x D) 1300 x 320 mm495 x 83 x 90 mm 240 x 450 x 390 mmNet Weight 4.9kg 1.6kg 10.5kgSPEAKERS(LHS-76PA)Front SpeakerRear SpeakerCenter SpeakerPassive Subwoofer(LHS-76PAF)(LHS-76PAS)(LHS-76PAC)(LHS-76PA

39、W)Type2 Way 3 Speaker1 Way 1 Speaker2 Way 3 Speaker1 Way 1 SpeakerImpedance4 4 4 3 Frequency Response80 - 18000 Hz120 - 20000 Hz80 - 18000 Hz40 - 1,500 HzSound Pressure Level86 dB/W (1m)82 dB/W (1m)86 dB/W (1m)82 dB/W (1m)Rated Input Power100W100W100W200WMax. Input Power200W200W200W400WNet Dimension

40、s (W x H x D)300 x1350 x300 mm 120 x248x96 mm500 x160 x155 mm240 x450 x390 mmNet Weight5.35 kg0.87 kg1.73 kg10.5 kgSPEAKERS(LHS-76SA)Front/Rear Speaker Center speaker Passive Subwoofer(LHS-76SAS)(LHS-76SAC)(LHS-76SAW)Type 1 Way 1 Speaker 1 Way 1 Speaker 1 Way 1 SpeakerImpedance 4 4 3 Frequency Respo

41、nse 120 - 20,000 Hz 120 - 20,000 Hz 40 - 1,500 HzSound Pressure Level 82 dB/W (1m) 83 dB/W (1m) 82 dB/W (1m)Rated Input Power 100 W 100 W 200 WMax. Input Power 200 W 200 W 400 WNet Dimensions (W x H x D)120 x 248 x 96 mm 300 x 115 x 96 mm 240 x 450 x 390 mmNet Weight 0.87kg 0.78kg 10.5kg1-8(* Depend

42、ing on the sound modesettings and the source, there maybe no sound output.)AMPLIFIER(LH-T96s)Stereo mode 155W + 155W (Rated Output Power 130W, 4 at 1 kHz, THD 10 %)Surround mode Front: 155W + 155W (Rated Output Power 130W, THD 10 %)Centre*: 155WSurround*: 155W + 155W (Rated Output Power 130W, 4 at 1

43、 kHz, THD 10 %)Subwoofer*: 225W (Rated Output Power 180W, 3 at 30 Hz, THD 10 %)Inputs AV INOutputsS-VIDEO, MONITOR, PHONES: (32 , 1.0 V)SPEAKERS(LHS-96IA)Front/Rear Speaker Center speaker Passive Subwoofer(LHS-96IAS) (LHS-96IAC) (LHS-96IAW)Type 2 Way 3 Speaker 2 Way 3 Speaker 1 Way 1 SpeakerImpedanc

44、e 4 4 3 Frequency Response 80 - 18,000 Hz 80 - 18,000 Hz 40 - 1,500 HzSound Pressure Level 86 dB/W (1m) 86 dB/W (1m) 82 dB/W (1m)Rated Input Power 155 W 155 W 225 WMax. Input Power 310 W 310 W 450 WNet Dimensions(W x H x D) 300 x 1350 x 300 mm 500 x 160 x 155 mm 240 x 450 x 390 mmNet Weight 5.35kg 1

45、.73kg 10.5kg2-1SECTION 2. AUDIO PARTAUDIO 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)CHEC

46、K IFR345 R350, R154OK.REPLACER345 R350, 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 DIAGRAM (1000W, LH-T96s)NOTES) Symbol denotes AC ground.N

47、OTES) Symbol denotes DC chassis ground.NOTE) WarningNOTE) Parts that are shaded are criticalNOTE) With respect to risk of fire orNOTE) electricial shock.A123456789101112BCDEFGHIJKLMNOPQRST2-102-112. SMPS(POWER) CIRCUIT DIAGRAM (700W, LH-T76s)A123456789101112BCDEFGHIJKLMNOPQRSTNOTES) Symbol denotes A

48、C ground.NOTES) Symbol denotes DC chassis ground.NOTE) WarningNOTE) Parts that are shaded are criticalNOTE) With respect to risk of fire orNOTE) electricial shock.2-122-133. SMPS(POWER) CIRCUIT DIAGRAM (300W, LH-T36s)NOTES) Symbol denotes AC ground.NOTES) Symbol denotes DC chassis ground.NOTE) Warni

49、ngNOTE) Parts that are shaded are criticalNOTE) With respect to risk of fire orNOTE) electricial shock.A123456789101112BCDEFGHIJKLMNOPQRST2-142-154. POWER INTERFACE CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-162-175. -COM(MAIN) CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-182-196. SE

50、RVO CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-202-217. I/O CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-222-238. MIC CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-242-259. USB CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-262-2710. MIC & USB CIRCUIT DIAGRAMA1234567891011