LG-DA5620-cd-sm 维修电路原理图.pdf

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1、- 1-1 -CONTENTSSECTION 1. GENERAL SERVICING PRECAUTIONS.1-2 ESD PRECAUTIONS.1-4 SPECIFICATIONS.1-5 LOCATION OF CUSTOMER CONTROLS.1-6SECTION 2. AUDIO PART ELECTRICAL TROUBLESHOOTING GUDIE.2-1 DVD PLAYER PROGRAM DOWNLOAD METHOD.2-5 WAVEFORMS OF MAJOR CHECK POINT.2-7 INTERNAL BLOCK DIAGRAM OF ICs.2-8 I

2、C VOLTAGE SHEET .2-10 BLOCK DIAGRAM.2-14 SCHEMATIC DIAGRAMS.2-16 PRINTED CIRCUIT DIARGAMS.2-28SECTION 3. DVD PART ELECTRICAL TROUBLESHOOTING GUIDE .3-1 BLOCK DIAGRAMS.3-9 SCHEMATIC DIAGRAMS.3-13 WAVEFORMS.3-21 PRINTED CIRCUIT DIAGRAM.3-27SECTION 4. MECHANSIM.4-1SECTION 5. EXPLODED VIEWS.5-1SECTION 6

3、. SPEAKER PART.6-1SECTION 7. REPLACEMENT PARTS LIST.7-1RadioFans.CN 收音机爱 好者资料库SECTION 1. GENERAL PARTSERVICING 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

4、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 andimpact. If it is

5、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 should absolutely n

6、ever 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 should be cleaned a

7、way by using an air bush (such as usedfor camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, acotton 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 extremely dirty

8、, apply isopropyl alcohol to the cotton swab. (Donot use any other liquid cleaners, because they will damage the lens.) Take care not to use too much ofthis alcohol on the swab, and do not allow the alcohol to get inside the pick-up.- 1-2 -Storage in conductive bagDrop impactNEVER look directly at t

9、he laser beam, and dont letcontact fingers or other exposed skin.MagnetHow to hold the pick-upaPressurePressureCotton swabConductive SheetRadioFans.CN 收音机爱 好者资料库NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (las

10、er diode). Thesecomponents are sensitive to, and easily affected by, static electricity. If such static electricity is highvoltage, components can 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 com

11、ponents. Care mustbe taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strongmagnetism 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 equ

12、ipment, 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 electricity.)4)

13、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 from the ar

14、mband.7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.- 1-3 -ArmbandConductiveSheetResistor(1 Mohm)Resistor(1 Mohm)ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Su

15、ch 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 by st

16、atic 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 be remo

17、ved 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 conductivesurface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.3. Use only a grounde

18、d-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 electrical ch

19、arges sufficient to damage ESDdevices.6. Do not remove a replacement ESD device from its protective package until immediately before you are readyto install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive foam, aluminum foil or comparable conducti

20、ve 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 ALL OT

21、HERSAFETY 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 cangenerate static electricity sufficient to damage an ESD device).CAUTIO

22、N. 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 OFELECTRIC SHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATER

23、AL TRIANGLE IS INTENDED TO ALERT THESERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICELITERATURE.- 1-4 - 1-5 -SPECIFICATIONSPower supplyAC 220240V, 50/60HzPower consumption70WGeneralMass4.6kgExternal dimensions (W x H x D)360 x 72 x 350mmOperating conditionsTemperature: 5C

24、to 35C, Operation status: HorizontalOperating humidity5% to 85%LaserSemiconductor laser, wavelength 650nmSignal systemPAL 625/50, NTSC 525/60CD/DVDFrequency range(audio)4 Hz to 20 kHzSignal-to-noise ratio(audio)More than 75dB (1kHz, NOP, 20kHz LPF/A-Fiter)Dynamic range (audio)More than 75dBHarmonic

25、distortion(audio)0.5% (1kHz, at 12Q position) (20kHz LPF/A-Filter)Video input1.0V (p-p), 75, negative sync., RCA jackVideoVideo output1.0V (p-p), 75, negative sync., RCA jackS-video output(Y) 1.0V (p-p), 75, negative sync., Mini DIN 4-pin x 1(C) 0.3V (p-p), 75Tuning Range87.5108MHzFMIntermediate Fre

26、quency10.7MHzSignal-to Noise Ratio60dBFrequency Response15010,000HzAM(MW)Tuning Range5221, 611kHzIntermediate Frequency450kHzStereo mode35W + 35W(8 at 1kHz, THD 10%)Surround modeFront: 50W+50W (THD 10%)Center*: 35WSurround*: 50W +50W(8 at 1Hz, THD 10%)35WSubwoofer*: 35W(8 at 30Hz, THD 1%)AmplifierIn

27、putsVIDEO 1, 2, OPTICAL AUDIOOutputsVIDEO 1(AUDIO OUT): 2VWOOFER: 2VSatellite Speaker(FE-3620TE)Passive Subwoofer(FE-3620WE)Type1 Way 1Speaker1Way 1SpeakerImpedance88Frequency Response11040,000Hz45 1,500HzSpeakersSound Pressure Level83dB/W(1m)82 dB/W(1m)Rated Inut Power35W35WMax. Input Power70W70WNe

28、t dimensions(W x H x D)90 x 70 x 106.5mm160 x 350 x 325mmNet Weight0.65kg4.5kgSuppliedAccessories Audio cable. 1 Speakers . 6 Remote control. 1 AM Ioop antenna. 1 Video cable. 1 Speaker cables. 5 Batteries (AAA). 2 FM antenna . 1* Depending on the soundmode settings and thesource, there may be nosou

29、nd output.Tuner- 1-6 -LOCATION OF CUSTOMER CONTROLSFRONT PANELDISPLAY WINDOWSOUND MODEINDICATORANGLE ICONINDICATORDISC INDICATORPLAY/PAUSEINDICATORREC/RDSINDICATORREPEAT PLAY BACK MODE INDICATORTOTAL PLAYING TIME/ELAPSEDTIME/FREQUENCY/DELAYTIME/VOLUME. INDICATORSSLEEPINDICATORTUNEDINDICATORSTEREOIND

30、ICATORCD/DVD RECEIVERDA-3620PHONESFM/AMPLAY/PAUSEFUNCTIONSTANDBY/ONTUNING/SKIPMEMORYSTOP/CLEARENTERMONO/ST.OPEN/CLOSEOPEN/CLOSEDISC TRAYFUNCTIONBUTTONMENU (MONO/STERO) BUTTONVOLUME CONTROLLERPHONECONNECTORTITLE (FM/AM)BUTTONENTER BUTTONSTOP (MEMORY/CLEAR) BUTTONSKIP/TUNEBUTTONSPALY/PAUSEBUTTONPOWER

31、BUTTON AND INDICATOR- 1-7 -REAR PANELYSPEAKERCONNECTORSVIDEO SELECTORSWITCHVIDEO1(INPUT/OUT PUT)CONNECTORSS-VIDEO OUTCONNECTORAM ANTENNACONNECTORFM75 COAXALANTENNA CONNECTORS-VIDEO COMPONENT SWITCHVIDEO 2(INPUT)CONNECTORWOOFER OUTCONNECTOR- 2-1 -SECTION 2. AUDIO PARTELECTRICAL TROUBLESHOOTING GUDIET

32、urn power on.Is power on?Does initial read work?Does it play?Does it output audio?Check power supply circuit.Check laser circuit.Check focus circuit.Check disc.Check tracking servo circuit.Check audio circuit.OKYESYESYESYESNONONONO1.- 2-2 -2. AUDIO . COM Circuit POWER ONDoes CD/DVDappear at FLT?Does

33、 LOADINGappear at FLD?Does it appearDVD Error atFLD?Does Video1/2FM 87.5 appearat FLD?OK.CheckConnector(PN103)ifis normally.Reconnet it.Refer to SMPSRefer to oscillatorCircuit.Check DVD Reset Waveform.Check IC101 Reset Wavefrom.Check 3.3V line.Check Power dection Circuit.Check power partof Main B/D.

34、Check oscillatorof x101.Check if CN103Pin is High.Check if IC101Pin is High.Check if IC101 Pin , , , is high(5V).Check if IC101 Pinis High .Replace IC 101.Does no Dise orTime appear at FLD?Check if DVD an Audio Micom Interface is OK.Check power.Check DVD Module.Check SMPS.174672 9011526- 2-3 -3. Fro

35、nt Circuit (1/2)POWER ONLED OFF.Is digitronon normally?Check ifthe PN101/PN102is OK.Check if theFront power isOK(*1).Refer to SMPS Part.Reconnec it.Check if theVFD001 Pinsare OK.Check Pattenand Resoldering.Check if all Buttensare OK.Check if theVolume isOK.Check if theHeadphone isOK.Check if theRemo

36、con isOK.Front B/D OK.* 1: PN101 PinsPin 1: -32VPin 8: -28VPin 9: -32VPin 20: 12V- 2-4 -Front Circuit (2/2)Check if the Power part of theFront is OK.Check if the Power part of the Front is OK.Check ifR027R036OK.Check ifPN101 pin 12, 13WaverfromOK.Check ifR023, R024OK.Refer to MicomCircuitRefer to Mi

37、comCircuit.Refer topower(SMPS).Refer topower(SMPS).Refer to SMPS part.Refer to SMPS.Replace R027R036Replace R023, R024.Check if the Power part of the Front is OK.Check if the Power Part of the Front is OK.Check if theRMC001Volumeis OK (5V).Check if the Remocon waveform of thePN101 pin 11.Check if th

38、ePN101 pin19is Low.Check ifheadphoneJack in JK001 is OK.Refer to M-COMCircuit.Check Main B/D.Replace RMC 001.Check RMC Circuit.Refer to MicomCircuit.Check JK001 Circuit.- 2-5 -DVD PLAYER PROGRAM DOWNLOAD METHOD1. DVD player without CD-RW option1-1) Download the DVD program from your PC as following

39、procedureACTIONFLD display Plug the Power cord out Connect the Fixture for download(Refer to Deck Mechanism Adjustment) Execute the prgram for download(Flashrom.exe) Open the DVD program file Plug the Power cord in Press the MENU Key on the Remote controllerFLASH Select Down icon with injector icon

40、then start download from the P.C I In status of download Erased the Flash memoryFLASH ERA Written the Flash memoryFLASH XX(XX: Program counter) Verified the Flash memoryFLASH XX(XX: Program counter) Completed the downloadFINISHEDI If an error was occurred during download, do not unplug the Power cor

41、d, and retry the downloadform the P.C until it is completed.2. DVD player with CD-RW option(for models using C-CUBEMPEG chip, marking on the IC is ZIVA)2-1) Make the DVD program upgrade Disc as following procedure *Recommended S/W: adaptec Easy CD Creater*use file format: ISO9660 Rename the souce fi

42、le from the P.C to FIRMWARE.BIN (Ex, If Source file is lg_a3_korea.bin, rename to FIRMWARE.BIN) Format the CD-RW Disc as below Make the Folder name to UPGRSADE.DVD under root folder(Ex, UPGRADE.DVD) Download the source file renamed to FIRMWARE.BIN in the folder(Ex, UPGRADE.DVD FIRMWARE.BIN)WWW- 2-6

43、-2-2) Insert the upgrade Disc into the DVD player slot, then the DVD player reads theDisc and upgrade the Firmware itself as followingsStatusFLD display on DVD player Detect the upgrade DiscNo display Read the DiscCd rEAD XX(XX: Program counter) Erased the Flash memoryFLASH ERA Written the Flash mem

44、oryFLASH XX(XX: Program counter) Verified the Flash memoryFLASH XX(XX: Program counter) Completed the upgradeFINISHEDNote: After completed, plug the Power cord out and in again, and then press the Open key, then theDisc will be ejected.Caution: While CD detecting and reading, if Open key or Power is

45、 pressed Then download procedure will be aborted.3. DVD player with CD-RW option (for models using NS MPEG chip, marking on the IC is PANTERA)3-1) Make the DVD program upgrade Disc as following procedure*Recommended S/W: adaptec Easy CD Creater*use file format: ISO9660 Format the CD-RW Disc as below

46、. Make the Folder name to “lg_dvd UPGRADE lg” under root folder( lg_dvd_firmware upgrade lg) Download the source file in the folder(Ex, If the source file is “lg_a3_korea.bin, “lg_dvd firmware upgrade lg lg_a3_korea.bin”)3-2) UPgrade the firmware for DVD player as followingsACTIONFLD display on dvd

47、player Insert the upgraded Disc into the DVD player soltPress Upthen starts the detecting Press the UP key on the Remote controllerREAD 0(If error is occurred, displayed then starts the readingretry counter)- Starts the upgradingUPGRADE 0(If error is occurred, displayedretry counter)- Completed the

48、upgradingFINISHED checksum- Opened the Tray Disc(“FINISHED checksum” is displayedrepeatedly at 2 second intervals) Plug the Power Cord outNote: In the status of FLD with “READ 0” or “UPGRADE 0”If an error is occured, the read counter, “READ 0”, shows retry counter or “ERROR num”If the num has 02, re

49、try the firmware upgrade procedure.If the error is continued after retrying 5 times, replace the Flash ROM IC.WWWWWWWWW- 2-7 -WAVEFORMS OF MAJOR CHECK POINT IC 208 pin Serial data clock waveform during normal play. IC 208 pin Serial data output wavefrom during normalplay.11(2V/Div.500nS/Div.OV(2V/Di

50、v.500nS/Div.OV(2V/Div.500nS/Div.OV384kHz(2V/Div.500nS/Div.OV(2V/Div.500nS/Div.OV1)2)57 IC 201 pin L/R clock data input wavefrom duringnormal operation. IC 201 pin Bit clock data input waveform duringnormal operation.113)4)4243 IC 301 pin , , , , , , , , , , , . PWM data output wavefrom during normal