LG-HT303SU-sur-sm 维修电路原理图.pdf

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1、MODEL: HT303SU(SH33SU-S/W)/HT353SD(SH33SD-S/W)SERVICE MANUALP/NO : AFN33723386 JANUARY, 2008DVD/CD RECEIVERSERVICE MANUALMODEL: HT303SU(SH33SU-S, SH33SU-W)/HT353SD(SH33SD-S, SH33SD-W)Website http:/Internal Use OnlyHT303SUHT353SDRadioFans.CN 收音机爱 好者资料库1-1Copyright 2008 LG Electronics.Inc.All right re

2、served.Only for training and service purposesLGE Internal Use OnlyCONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . 1-4 SERVICE INFORMATION FOR EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 HOW TO UPDATE AUDIO MICOM & DVD PROGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 SPECIFICATIONS . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 SECTION 2. ELECTRICAL PART TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING . . . . . . . .

5、 . . . . . . .2-13 INTERNAL BLOCK DIAGRAM OF ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 OVERALL BLOCK DIAGRAM . . . . . . . . . . .

6、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47 CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7、 . . . 2-69 SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 DECK MECHANISM EXPLODED VIEW(DP-12TV) . . . . . . . . . . . . . . .

8、 . . . . . . . . . . . . . . . 3-3 PACKING ACCESSORY SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 SPEAKER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 SECTION 4. MECHANISM (DP-12

9、TV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SECTION 5. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1RadioFans.CN 收音机爱 好者资料库Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE I

10、nternal Use Only1-2SERVICING 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 never be subjected to external pressure or impact.2. Repair notes1) The pic

11、k-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 subjected to strong pressure or impact, the result may be an operational malfuncti

12、on 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 touched.4) Laser beams may damage the eyes!Absolutely never permit laser b

13、eams 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 using an air bush (such as usedfor camera lens).The lens is held by a delic

14、ate spring. When cleaning the lens surface, therefore, a cottonswab should be used, taking care not to distort lens.6) Never attempt to disassemble the pick-up.Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.(Do not use any other liquid cleaners

15、, 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, and dont allow contact with fingers or other exposed skin.MagnetHow to hol

16、d the pick-upConductive SheetCotton swabPressurePressureSECTION 1. GENERAL1-3Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlyNOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations1) Compact disc players incorporate a great many ICs

17、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 components should be handled with care.2) The pick-up is composed of many optical components an

18、d other high-precision components. Care must betaken, therefore, to avoid repair or storage where the temperature or 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

19、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 bag, do not place the pick-up on the bag. (This isbecause there is the possibility of damag

20、e 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-up to come in contact with clothing, in order to prevent sta-tic electricity changes in the

21、 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 PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easil

22、y 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 chip components. The following techniques shouldbe used to help reduce the incidence of co

23、mponent 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 earth ground. Alternatively, obtain and wear acommercially available discharging wrist strap d

24、evice, 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 surfacesuch as aluminum foil, to prevent electrostatic charge buildup or exposure of the ass

25、embly.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 electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals. These

26、 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 devices are packaged with leads electrically shorted together byconductive foam, aluminum

27、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 which the device will by installed.CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR

28、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 lifting of your foot from a carpeted floor can gener-ate static electricity sufficient to

29、 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 VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCLAMA

30、TION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only1-5Copyright 2008 LG Electronics.In

31、c.All right reserved.Only for training and service purposesLGE Internal Use OnlySERVICE INFORMATION FOR EEPROM (DVD PART)POWER ONDVD LOGO Status (NO Disk status)Remote control Pause key-1-4-7-2 in order.Press number 09, Press characterAF (16 for a while)Use arrow key ( ) tomove to appropriate positi

32、on andmake changesPress pause key onceChange will be applied when powerOFF-ON.DETECT NEW EEPROM(OPTION EDIT SCREEN)NAMEOPT 1OPT 2OPT 3OPT 4OPT 5OPT 6OPT 7OPT 8OPT 9OPT AOPT BOPT COPT DOPT EOPT FOPT GHEX444530FF2205FC32AC00000000000000455311FF2205FC32AC00000000000000485520FF2205FC32AC0000000000000052

33、4F20FF2205FC32AC00000000000000HEXHEXHEX Germany, Austria, Netherlands, France (LGEDG) Spain, Portugal, Greece, Italy (LGEES) Hungary, Czech Republic (LGEMK) Romania (LGERO)Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only1-6SERVICE INFOR

34、MATION FOR EEPROM (AMP PART)POWER ONFLD no disc statusRemote control 2 + Front STOPpush same timing during 5sFLD OP-0.Use arrow key ( ) moveto appropriate position and makechangesPress ENTER key onceFLD write ok or up okRemote control 2 + Front STOPpush same timingFLD display E2P CLR or EP CLRAuto p

35、ower offMODEL : HT303NAMEHEXOPT 1 82OPT 2 CAOPT 3 21OPT 427OPT 500MODEL : HT353NAMEHEXOPT 1 82OPT 2 CAOPT 320OPT 427OPT 500DETECT NEW EEPROM(OPTION EDIT SCREEN)1-7HOW TO UPDATE AUDIO MICOM & DVD PROGRAMSCopyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE In

36、ternal Use Only1. How to update AUDIO MICOM program.Update using CD1. Change the filename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted.ex) HT353 : “HT353_0709081.HEX”2. Copy the file to the root folder of a CD and burn it.3. Insert the CD to the SET, and move to the DV

37、D function.Then the upgrade process will be started withthe upgrade information.4. If the upgrade process is complete, the set will be rebooted with “Complete” message.Update using USB1. Change the filename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted.ex) HT353 : “HT35

38、3_0709081.HEX”2. Copy the file to the root folder of USB storage.3. Put the USB into the SET, and move to the USB function.Then the upgrade process will be started withthe upgrade information.4. If the upgrade process is complete, the set will be rebooted with “Complete” message.2. How to update DVD

39、 program.Update using CD1. Rename the filename to download as “TARGET.BIN” in upper cases.2. Copy the file to “MTK_UPG” folder of CD, and burn it.Ex) P:MTK_UPGTARGET.BIN3. Insert the CD to the SET, then after a while the CD tray will be opened with upgrade information on thescreen.4. Remove the CD,

40、and press UP key in remote controller.5. Remove and reconnect the power cable when it changes to logo screen from upgrade information.Thenthe upgrade process is completed.Update using USB1. Rename the filename to download as “TARGET.BIN” in upper cases.2. Copy the file to “MTK_UPG” folder of the for

41、matted USB, and burn it.Ex) P:MTK_UPGTARGET.BIN3. Move to the USB function, and insert the USB to the set.The upgrade information will be shown on thescreen.4. Remove the USB, press UP key of the remote control.5. Remove and reconnect the power cable when it changes to logo screen from upgrade infor

42、mation.Thenthe upgrade process is completed.1-8Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use OnlySPECIFICATIONS(* Depending on the sound modesettings and the source, there maybe no sound output.)GENERALPower supplyRefer to main labelPower

43、 consumptionRefer to main labelNet Weight2.5 kgExternal dimensions (W x H x D)360 x 62 x 305 mmOperating conditionsTemperature: 5C to 35C, Operation status: HorizontalOperating humidity5% to 85%AMPLIFIEROutput PowerFront: 45W + 45W (Rated Output Power 30W, THD 10%)Center*: 45WSurround*: 45W + 45W (R

44、ated Output Power 30W, 4 at 1 kHz, THD 10%)Subwoofer*: 75W (Rated Output Power 60W, 8 at 30 Hz, THD 10%)SPEAKERS (SH33SU)Front/Rear/Center SpeakerPassive Subwoofer(SH33SU-S)(SH33SU-W)Impedance48 Net Dimensions 99 x 114 x 86 mm 156 x 325 x 320 mm(W x H x D)Net Weight (1EA)0.35 kg3.5 kgSPEAKERS (SH33S

45、D)Front/Rear/Center SpeakerPassive Subwoofer(SH33SD-S)(SH33SD-W)Impedance48 Net Dimensions 99 x 114 x 86 mm 156 x 325 x 320 mm(W x H x D)Net Weight (1EA)0.35 kg3.5 kgDesigns and specifications are subject to change without notice.2-1Copyright 2008 LG Electronics.Inc.All right reserved.Only for train

46、ing and service purposesLGE Internal Use OnlySECTION 2. ELECTRICAL PARTTROUBLESHOOTING GUIDE1. Power Supply CircuitYESNOCheck power plug and powersupply circuit.NOCheck power supply circuit.NOCheck laser circuit.Check focus circuit.Check disc.NOCheck tracking servo circuit.NOCheck audio circuit.Does

47、 red power ledturn on?YESIs power on?YESDoes red power ledturn on?YESDoes it play?YESDoes it outputaudio?YESYESTurn power on.INSERT POWER CORD.OK2-2Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only2. Front circuit (1/2)NONOReconnect it.Y

48、ESYESYESCheck ifPN103 is ok?Red LED turn off?NONORefer to SMPS part.YESYESCheck if the frontpower is ok?Is the Digitron oncorrectly?NONOCheck pattern and resolderingYESCheck ifRC2 is ok?Check if the remotecontrol is ok?YESCheck if allbuttons are ok?POWER ON.Front B/D ok.122-3Copyright 2008 LG Electr

49、onics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only3. Front circuit (2/2)1NORefer to power(SMPS).NOReplace R345 R350.Check if thepower part of thefront is ok?YESCheck ifR345R350ok?YESRefer to MICOM circuit.2NORefer to power(SMPS).NOCheck RM circuitCheck if the po

50、werpart of the front is ok?YESNORefer to MICOM circuit.Check if the remotecontrol waveform of PN301pin5 is ok?YESCheck if RC2voltage is ok(5V)?YESResolder or Replace RC2.Copyright 2008 LG Electronics.Inc.All right reserved.Only for training and service purposesLGE Internal Use Only2-44. System opera