LG-HT552TH-sur-sm 维修电路原理图.pdf

《LG-HT552TH-sur-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《LG-HT552TH-sur-sm 维修电路原理图.pdf（62页珍藏版）》请在收音机爱好者资料库上搜索。

1、DVD/CD RECEIVERSERVICE MANUALMODEL : HT552TH SH52TH-C, SH52TH-S, SH52TH-WSERVICE MANUALP/NO : AFN31640733DECEMBER, 2006MODEL : HT552THSH52TH-C, SH52TH-S, SH52TH-Whttp:/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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD & AMP CIRCUIT DIAGRAMS . . .

6、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

7、-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-UP1. Notes for t

8、ransport 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 magnetic materials

9、.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 already individuall

10、y 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 part (lens, etc.) o

11、f 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 should be used, taking

12、 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 this alcohol on the

13、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. GENERAL1-3NOTES REGARDING COMP

14、ACT 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 for that reason com

15、ponents 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 excessive dust.2. N

16、otes 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 from its conductive

17、 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 permit the laser pick

18、-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 PRECAUTIONSElectrostati

19、cally 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 and semiconductor

20、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 touching a known eart

21、h 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 on a conductive su

22、rfacesuch 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 cangenerate electric

23、al 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 replacement ESD

24、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 circuit assembly into w

25、hich 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 clothes fabric or the

26、 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 UNINSULATED “DANGEROUS VOLT

27、AGE” 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 EEPROM(DVD PART)POWER ONDVD L

28、OGO 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.NAMEHEXOPT 100OPT 200OPT 300OPT 400OPT 500OPT 600OPT 700OPT

29、 800OPT 900OPT A00OPT B00OPT C00OPT D00OPT E00OPT F00OPT G00DETECT NEW EEPROM(OPTION EDIT SCREEN)*Refer to page 6-1.1-6SERVICE INFORMATION FOR EEPROM (AMP PART)POWER ONFLD no disc statusRemotecontrol 2 + Front STOPpush same timing during 5sFLD 00.Use arrow key ( ) moveto appropriate position and mak

30、echangesPress ENTER key onceFLD write ok or up okRemotecontrol 2 + Front STOPpush same timingFLD display E2P CLR or EP CLRAuto power offNAMEHEX0086 01FA0223 0300 0400DETECT NEW EEPROM(OPTION EDIT SCREEN)1-7SPECIFICATIONSGENERALPower supply Refer to main label.Power consumption Refer to main label.Ne

31、t Weight 3.6 kgExternal dimensions (W x H x D) 430 x 70 x 311 mmOperating conditions Temperature: 5C to 35C, Operation status: HorizontalOperating humidity 5% to 85%Laser Semiconductor laser, wavelength 650 nmCD/DVDSignal system PAL 625/50, NTSC 525/60Frequency response (audio) 200 Hz to 18 kHzSigna

32、l-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 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

33、 jack x 1/ 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 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

34、 - 8,000 HzAM MWTuning Range 522 - 1,620 kHz or 520 - 1,720 kHzIntermediate Frequency 450 kHzAMPLIFIER Stereo mode 70 W + 70 W (4 at 1 kHz, THD 10 %)Surround mode Front: 70 W + 70 W (THD 10 %)Center*: 70 WSurround*: 70 W + 70 W (4 at 1 kHz, THD 10 %)Subwoofer*: 150 W (3 at 30 Hz, THD 10 %)Inputs AUD

35、IO IN, OPTICAL INOutputs MONITOR OUT, EURO AV (TO TV) OUTCOMPONENT VIDEO OUTSPEAKERS Front/Rear Speaker Center speaker Passive Subwoofer(SH52TH-S)(SH52TH-C)(SH52TH-W)Type 2 Way 3 Speaker2 Way 3 Speaker1 Way 1 SpeakerImpedance 4 4 3 Frequency Response 100 - 20000 Hz150 - 20000 Hz40 - 1500 HzSound Pre

36、ssure Level 82 dB/W (1m)82 dB/W (1m)80 dB/W (1m)Rated Input Power 70 W70 W150 WMax. Input Power 140 W140 W300 WNet Dimensions(W x H x D) 260 x 1100 x 260 mm330 x 86 x 121 mm212 x 395 x 341 mmNet Weight 3.0 kg1.15 kg6.0 kg(* Depending on the sound modesettings and the source, there maybe no sound out

37、put.)2-1SECTION 2. AUDIO PARTAUDIO TROUBLESHOOTING GUIDE1. POWER SUPPLY CIRCUITInsert power cordYESYESYESYESYESYESYESTurn power on.NOCheck power plug and power supply circuit.NOCheck power supply circuit.NOCheck laser circuit.Check focus circuit.Check disc.NONOCheck tracking servo circuit.Check audi

38、o circuit.Does red power led turn on?Is power on?Does initial read work?Does it play?Does it output audio?OK2-22. FRONT CIRCUIT (1/2)YESYESYESYESYESYESYESNONOReconnect it.(Refer to notice *1)Tuner off the red led?Check if the PN301 is ok?NONONORefer to smps part.Check pattern andresoldering Is digit

39、ron on normally?Check if all buttons are ok?Check if the front power is ok?(*2)Check if the DIS301 is ok?NO1Check if the remotecontrol is ok?NO2Power on.Front b/d ok.*1 : When it is needed to reconnected FFC cable into PN301 Short 1pin of PN103 with 18pin of CN901 in amp part*2 : PN603 Pins.PIN1 : -

40、35 VKKPIN2 : -30 FL+PIN3 : -33 FL-PIN7 : +5VPIN13 : +5VA2-33. FRONT CIRCUIT (2/2)YESYESYESNOReffer to power(SMPS).NOReplack R345 R350, R154.Check if the power part of the front is ok?Check if R345R350, R150 ok?Refer to micom circuit.1YESYESYESNOReffer to power(SMPS).NOReffer to micom circuit.NOCheck

41、 rm circuitCheck if the power part of the front is ok?Check if the remotecontrol waveform of thePN301 pin11 is ok?Check if the RC2 voltage is ok(5V)?YESResoldering or replace RC2.22-42-5WIRING DIAGRAMFANVOLUMEDCACKMDSMPS PCBFRONT PCBVFDAMP PCBSPEAKER TERMINALMAIN PCBHDMIJACKSCART JACKAV JACKCOMPONEN

42、T S/WOPTICAL INHEAT SINKPN602PN203PN601CN602PN603PN202PN206PN302PN2026630R-FB05K6630XE00111PN20411PINMIC1CN301EAD35219301MIC2USBSTEREOPN301PN103P44016630XE0012323PINCN902CN901P44026630XE001093PIN15PIN9PIN14PINTUNERKEY PCB561-711O6630XE001206630XE001206630XE00124EAD35214501EAD35219501561-715N561-661B

43、6630XE012246630XE00118561-711C6630R-FB05RCABLE3 EAD35201502CABLE1 EAD35201101CABLE4 EAD35201302CABLE2 EAD35632101EAD35214501EAD352195012-62-7BLOCK DIAGRAMIC508PORTABLEIC204AK5358ADCIC203NJM4580OPAMPDVD_DIDVD_CLKDVD_CEDVD_DO IC501IP9009AIC601TAS5152TAS5152TAS5152TAS5152FLFRWFCRLRR2-82-9CIRCUIT DIAGRA

44、MS 1. SMPS(POWER) CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRSTNOTES) 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.IMPORTANT SAFETY NOTICEWHEN SERVICING THIS CHA

45、SSIS, UNDER NO CIR-CUMSTANCES SHOULD THE ORIGINAL DESIGN BEMODIFIED OR ALTERED WITHOUT PERMISSIONFROM THE LG CORPORATION. ALL COMPONENTSSHOULD BE REPLACED ONLY WITH TYPES IDENTI-CAL TO THOSE IN THE ORIGINAL CIRCUIT. SPECIALCOMPONENTS ARE SHADED ON THE SCHEMATICFOR EASY IDENTIFICATION.THIS CIRCUIT DI

46、AGRAM 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 SERVICELITERATURE IS PRINTED.NOTE : 1. Shaded( ) parts are critical for safety. Replace only with specified part number

47、.2. Voltages are DC-measured with a digital voltmeterduring Play mode.2-102-112. POWER INTERFACE CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-122-133. -COM(MAIN) CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-142-154. SERVO CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-162-175. I/O

48、 CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-182-196. MIC & USB & PTB CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-202-217. POWER KEY CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-222-238. TIMER CIRCUIT DIAGRAMA123456789101112BCDEFGHIJKLMNOPQRST2-242-259. HDMI CIRCUIT DIAGRAMA12

49、3456789101112BCDEFGHIJKLMNOPQRSTPRINTED CIRCUIT BOARD DIAGRAMS1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW )2-262-272-282-292. MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW )3. SMPS P.C. BOARDNOTES) WarningNOTES) Parts that are shaded are criticalNOTES) with respect to risk of fire orNOTES) electricial shock.2-302

50、-312-322-334. KEY P.C. BOARD5. TIMER P.C. BOARD2-342-356. USB P.C. BOARD3-1ELECTRICAL TROUBLESHOOTING GUIDESECTION 3. DVD & AMP PART1. AMP PROTECTIONPROTECTION appears on the FLD.Power on.Replace TI AMP IC(IC701704).PROTECTION appears continuously on the FLD.Is the IC101 pin64 LOW signal(0V)?Is the