LG DA-3520 Service Manual Download Page 32 | Manualshive

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- 3-1 -

SECTION 3. DVD PART

ELECTRICAL TROUBLESHOOTING GUIDE

1. µ-COM Circuit

A. Open/Close abnormal

B. Video abnormal

Check the

connection of P5101.

Check IC501 Pins 13, 14.

YES

NO

NO

YES

YES

(If OK)

YES

Check Front.

Reconnect it.

Refer to SERVO part.

Check the connection of MD.

OPEN/CLOSE ABNORMAL

Check Audio jack.

YES

(If OK)

YES

(If OK)

YES

(If OK)

YES

(If OK)

Check PLLFC of MPEG part.

Refer to Audio part.

Refer to MPEG part.

Replace B/D.

AUDIO ABNORMAL

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Summary of Contents for DA-3520

Page 1: ... 5 WAVEFORMS OF MAJOR CHECK POINT 2 7 INTERNAL BLOCK DIAGRAM OF IC s 2 8 IC VOLTAGE SHEET 2 13 BLOCK DIAGRAM 2 15 SCHEMATIC DIAGRAMS 2 17 PRINTED CIRCUIT DIARGAMS 2 25 SECTION 3 DVD PART ELECTRICAL TROUBLESHOOTING GUIDE 3 1 BLOCK DIAGRAMS 3 8 SCHEMATIC DIAGRAMS 3 11 WAVEFORMS 3 19 PRINTED CIRCUIT DIAGRAM 3 21 SECTION 4 MECHANSIM 4 1 SECTION 5 EXPLODED VIEWS 5 1 SECTION 6 SPEAKER PART 6 1 SECTION 7...

Page 2: ...r 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 surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the...

Page 3: ... bag do not place the pick up on the bag This is because 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 1MΩ 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent static electricity changes in the clothing to escap...

Page 4: ...mbly 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 generate electrical charges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD devic...

Page 5: ...uning Range 87 5 108MHz FM Intermediate Frequency 10 7MHz Signal to Noise Ratio 50dB Frequency Response 150 12 000Hz AM MW Tuning Range 530 1 810kHz Intermediate Frequency 450MHz Stereo mode 30W 30W 8Ω at 1kHz THD 1 Amplifier Surround mode Front 30W 30W Center 30W Surround 30W 30W 8Ω at 1Hz THD 1 Subwoofer 30W 8Ω at 60Hz THD 1 Inputs VIDEO 1 2 Outputs VIDEO 1 AUDIO OUT 2V WOOFER 2V Satellite Speak...

Page 6: ...t the bottem see page 46 OPEN CLOSE button Remote sensor POWER button and indicator PCM MUTE DIGITAL PRO LOGIC DVD CD VCD MP3 HALL1 THEATER HALL2 dts RDS TITLE REPEAT CHP TRK MEMORY PROGRAM ms dB MHz kHz ALL A B SLEEP TUNED STEREO Sound mode indicator RDS indicator PROGRAM indicator SLEEP indicator TUNED indicator STEREO indicator MUTE indicator MEMORY indicators Chapter Track number indicator Tit...

Page 7: ...nectors VIDEO 2 Input Connectors S VIDEO OUT Connector WOOFER OUT Connector POWER CORD Connect to an AC 230V 50Hz outlet only VIDEO SELECTOR Switch R L FM 75 GND AM AUTO NTSC PAL VIDEO SELECTION S VIDEO OUT AUDIO L R WOOFER OUT VIDEO 2 VIDEO IN IN R REAR 8 WOOFER 8 CLEAR FRONT SPEAKER 8 8 L OUT VIDEO 1 MONITOR OUT REAR PANEL ...

Page 8: ...on TEST TONE button DELAY button LEVEL button RETURN button DISPALY button MENU button MENU button SET UP button SEARCH button MARKER button SLOW SCAN buttons SKIP SEARCH button PREST buttons FM AM button CD DVD button VOLUME buttons PAUSE button PROGRAM buttons ARROW buttons ENTER button ANGLE button SUBTITLE button REPEAT A B button ZOOM button TITLE button CLEAR button AUDIO button PLAY button ...

Page 9: ...NG GUDIE Turn 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 OK YES YES YES YES NO NO NO NO 1 ...

Page 10: ...er to SMPS Refer to oscillator Circuit CheckDVDResetWaveform CheckIC101ResetWavefrom Check3 3Vline CheckPowerdectionCircuit Checkpowerpart ofMainB D Checkoscillator ofx101 CheckifCN103 Pin isHigh CheckifIC101 Pin isHigh CheckifIC101Pin ishigh 3 3r CheckifIC101Pin isHigh Replace IC 101 DoesnoDiseor TimeappearatFLD CheckifDVDanAudio MicomInterfaceisOK Checkpower CheckDVDModule Check SMPS 42 30 3 63 ...

Page 11: ...OK Replace R 427 Refer to SMPS Part Reconnec it Checkifthe VFD401Pins areOK Check IC401Pins Wavefrom Refer to Micom Circuit Check Patten and Resoldering Replace IC401 CheckifallButtens areOK Check if the Volume is OK Checkifthe Headphoneis OK Checkifthe Remoconis OK Front B D OK 1 CN401 Pins Pin 13 5V Pin 14 32V Pin 15 28V Pin 16 32V 2 CN401 Pins Pin 14 5V Pin 133 32V 3 VFD401 Pins F11 28V F22 32V...

Page 12: ... to power SMPS Refer to power SMPS Refer to SMPS part Refer to SMPS ReplaceR401 R415 ReplaceR430 R431 Check ifthePowerpartofthe FrontisOK Checkifthe PowerPartofthe FrontisOK Checkifthe RMC401Volume isOK 5V Checkifthe Remoconwaveformof theCN401 Check if the CN401 pin11 is Low Checkif headphoneJack inJK401is OK Refer to M COM Circuit Check Main B D Replace RMC 401 Check RMC Circuit Refer to Micom Ci...

Page 13: ...X Program counter Verified the Flash memory FLASH XX XX Program counter Completed the download FINISHED If an error was occurred during download do not unplug the Power cord and retry the download form the P C until it is completed 2 DVD player with CD RW option for models using C CUBE MPEG chip marking on the IC is ZIVA 2 1 Make the DVD program upgrade Disc as following procedure Recommended S W ...

Page 14: ...format ISO9660 Format the CD RW Disc as below 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 followings ACTION FLD display on dvd player Insert the upgraded Disc into the DVD player solt Press U...

Page 15: ...play 1 1 2V Div 500nS Div OV 2V Div 500nS Div OV 2V Div 500nS Div OV 384kHz 2V Div 500nS Div OV 2V Div 500nS Div OV 1 2 4 18 IC 202 pin L R clock data input wavefrom during normal operation IC 202 pin Bit clock data input waveform during normal operation 1 1 3 4 3 4 IC 202 pin PWM data output wavefrom during normal operation 1 5 27 28 29 30 ...

Page 16: ...I O Analog input Analog inputs to A D converter 8 pins PA7 AN7 PB0 CINT I O Input External capture input to 16 bit timer counter PB1 CS0 I O Input Chip select input for serial interface CH0 PB2 SCK0 I OI O Serial clock I O CH0 PB3 SI0 I O Input Serial data input CH0 PB4 SO0 I O Output Serial data Output CH0 PB5 SCK1 I OI O Serial clock I O CH1 PB6 SI1 I O Input Serial data input CH1 PB7 SO1 Output...

Page 17: ...s I O Input Port I 8 bit I O port I O can be set in a unit of single bits Incorporation of pull up resistor can be set through the software in a unit of 4 bits 8 pins PI4 to PI7 I O External interruption request inputs EXTAL Input Crystal connectors for system clock oscillation When the clock is supplied XTAL Output externally input to EXTAL opposite phase clock should be input to XTAL TEX Input C...

Page 18: ... SDI_2 SDATA_IN RXP RXN RESET S PDIF AC 97 PLL XTI XTO CKOUT RAM PowerDown 12S DDX 11 10 9 4 1 2 18 19 7 14 15 43 PWDN 44 EAPD 35 SDO_3 43 SDO_2 43 SDO_1 43 LFE_B 43 LFE_A 43 SRIGHT_B 43 SRIGHT_A 43 SLEFT_B 43 SLEFT_A 43 RIGHT_B 43 RIGHT_A 43 LEFT_B 43 LEFT_A 43 BICKO 43 LRCKO 43 STA500 ...

Page 19: ... 2 11 CS4228 CS49300 CS8415A ...

Page 20: ... 2 12 µPD16311 NJM2279 NJU7312A ...

Page 21: ...4 0 28 PIN No Volt V PIN No Volt V 1 5 41 5 2 2 5 42 0 3 0 43 0 4 0 44 0 5 0 45 5 6 5 46 0 7 5 47 1 7 8 5 48 3 9 9 9 49 5 10 0 50 2 6 11 0 51 5 5 12 0 52 5 4 13 5 53 2 14 0 54 5 15 5 55 5 16 5 56 4 6 17 5 57 0 18 5 58 4 5 19 5 59 5 20 5 60 4 8 21 5 61 5 22 5 62 5 23 5 63 5 24 5 64 5 25 5 65 5 26 0 66 3 4 27 0 67 4 9 28 0 68 0 29 5 69 0 30 5 70 0 31 5 71 5 32 5 72 5 33 0 73 5 34 5 74 3 5 35 0 75 0 ...

Page 22: ...18 3 5 4 1 5 19 2 2 5 1 5 20 2 2 6 1 5 21 5 7 22 8 3 2 23 2 3 9 2 5 24 2 3 10 1 6 25 2 3 11 0 26 2 3 12 2 9 27 2 3 13 3 2 28 2 3 14 3 2 29 2 3 CS49326 IC704 PIN No Volt V PIN No Volt V 1 2 4 23 2 5 2 0 24 3 0 25 1 6 4 0 26 1 6 5 27 1 6 2 9 28 1 6 7 0 29 1 6 8 2 4 30 1 9 2 4 31 0 10 2 4 32 2 11 2 4 33 1 3 12 2 5 34 2 5 13 0 35 0 14 2 4 36 3 2 15 2 4 37 2 5 16 2 4 38 2 5 17 2 4 39 0 18 3 2 40 0 19 1...

Page 23: ...2 15 2 16 BLOCK DIAGRAM ...

Page 24: ...M NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmefer during Play mode ...

Page 25: ...2 19 2 20 µ COM FRONT SCHEMATIC DIAGRAM ...

Page 26: ...2 21 2 22 DAP Digital Amplifier Part SCHEMATIC DIAGRAM ...

Page 27: ...2 23 2 24 DSP DIGITAL AUDIO PROCESSING SCHEMATIC DIAGRAM ...

Page 28: ...2 25 2 26 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD SOLDER SIDE ...

Page 29: ...2 27 2 28 MAIN P C BOARD COMPONENT SIDE ...

Page 30: ...2 29 2 30 MAIN FRONT P C BOARD SOLDER SIDE MAIN FRONT P C BOARD COMPONENT SIDE ...

Page 31: ...g Parts that are shaded are critical With respect to risk of fire or electrical shock NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmefer during Play mode ...

Page 32: ...k the connection of P5101 Check IC501 Pins 13 14 YES NO NO YES YES If OK YES Check Front Reconnect it Refer to SERVO part Check the connection of MD OPEN CLOSE ABNORMAL Check Audio jack YES If OK YES If OK YES If OK YES If OK Check PLL FC of MPEG part Refer to Audio part Refer to MPEG part Replace B D AUDIO ABNORMAL ...

Page 33: ...isc Error Check the disc If OK YES If OK YES If OK Refer to Servo part Check PLLIC of MPEG part Check DSP Check MPEG YES If OK Replace B D PICTURE ABNORMAL Check Disc YES If OK YES If OK Refer to Servo part Replace B D DISC ERROR ...

Page 34: ...coder Does the moving picture of the video CD play on the screen normally Does the audio sound output normally END Check power clock Check CD DVD DSP output signal Check MPEG Decoder input signal Check CD DVD DSP output signal Check MPEG Decoder input signal Check CD DVD DSP output signal Check MPEG Decoder input signal Check clock signal Check clock signal YES YES YES YES YES YES YES YES YES YES ...

Page 35: ...en the power is on Does TTL pulse output to IC201 Pins 140 142 Does 33 8688MHz clock input to IC201 Pin 63 Is IC201 Pins 83 84 88 89 voltage about 2 2V Replace IC201 IC206 soldering or IC defect Check power circuit Check 2 COM Part Replace X301 or IC304 30MHz clock defect CHECK POINT General END NO NO NO NO NO YES YES YES YES YES ...

Page 36: ...ens move up and down Check Focus Driver output IC201 Pin 83 IC2M1 Pins 37 38 Check SLED Driver output IC201 Pin 88 IC2M1 Pins 28 29 IC201 Pin 88 no output IC201 is defective IC2M1 Pin 18 no output IC2M1 is defective IC201 Pin 83 no output IC201 is defective IC2M1 Pins 1 2 no output IC2M1 is defectiv DECK assembly is defective Slide the pick up to inner track Power on Check loading Part Push Pick u...

Page 37: ...n appear OPEN CLOSE Replace COM or IC201 Replace IC201 Check IC2A1 Pin 1 1 12 13 14 in DVD Mode Fig 3 FOCUS ERROR waveform IC201 no output Pick up is defective Check IC201 and IC2M1 when PMD03 Pin 6 is abnormal Check IC2M1 Pin 21 PMD03 Pin 6 turn when the IC2M1 Pin 21 is less than 2 2V Check A Video Part is defective Check 5 MPEG Circuit Check 7 OSD Video Circuit Replace COM part IC2A1 is defectiv...

Page 38: ...n RF 1 5 1 6V IC2A1 Pin 57 Fig 5 RF waveform Check IC2A1 Pins 5 6 7 8 No signal Pick up is defective Replace IC201 Check IC201 Pin84 No signal at IC201 IC201 is defective Check IC201 Pin 162 Check the clock at the IC201 Pins 28 30 Both are normal IC201 is defective Replace IC2A1 CHECK A END NO NO NO NO YES YES YES YES ...

Page 39: ...otor Actuator Driver PICK UP DVD A B C D FE TE PI SBADD SENS FOK SLD_FG MSDATO DEFECT DSP_SENSE SQSO SQCK SCOR XLAT S_CLK S_DATA DSP_CS WR RD DO 0 7 AO 0 5 DVD_DATA 0 7 MCK UCOM I F MPEG I F UCOM I F M D DVD CD RF MIRR TZC ICADDR 0 8 ICDATA 00 15 MON MDP FDO TDO FMO Spindle focus tracking loading sled SPINDLE_FG Load open close loading control CD A B C D E F 4 4 5 3 3 3 8 6 8 8 2 4 9 16 ...

Page 40: ...TA 0 7 DAI_DATA DA_DATA 0 3 DA_BCK DA_XCK DA_LRCK SPDIF AUDIO I F A V JACK I F U COM I F SERVO I F DA_XCK MPEG_CLK 8 SDCLK1 ZISENB REQZ1 2 2 A 00 02 D 00 07 MPEG_ERROR MPEG_RST DVD_SD_CS0 DVD_UDQM DVD_MD 0 15 DVD_MA 0 11 DVD_SD_CAS DVD_SD_RAS DVD_SD_CLK DVD_MWE DVD_LDQM DVD_SD_CS1 S_CLK S_DATA DPLL_L MCK 8 4 4 2 12 16 3 CVBS Y SEL Y G PB B PR R CVBS Y C Y G PB B PR R IC372 LA7135AM SwitchIC ...

Page 41: ...UTE DAC_RST Y_SEL MPEG_ERROR DAC_L0 RF_LAT DSP_CS MPEG_CS PP_CS 16 Y_SEL MPEG_RST PWR_CTL SENS LIMIT_SW MIC_ON CLOSE_SW OPEN_SW MPEG_W AIT 16 9 MPEG_RST M_RESET M_RESET RXD0 TXD0 SCK0 F_REQ MODE_SW M_REQ ECHO IIC_CLK IIC_DATA SENS_MCOM MICOM_WAIT IOCS1 WR D 00 04 A 19 21 A 01 19 D 00 15 A 01 09 D 00 15 A 01 21 21 D 00 15 D 00 07 DAC_RST E_DR S_XRST XLAT ACT_MUTE LOAD_OPEN LOAD CLOSE PWR_RST EXP_W2...

Page 42: ...3 11 3 12 SCHEMATIC DIAGRAMS DRIVE RF SCHEMATIC DIAGRAM ...

Page 43: ...3 14 3 13 DVD DSP DIGITAL SIGNAL PROCESSING SCHEMATIC DIAGRAM ...

Page 44: ...3 15 3 16 µ COM SCHEMATIC DIAGRAM ...

Page 45: ...3 17 3 18 MPEG SCHEMATIC DIAGRAM ...

Page 46: ... 3 IC2A1 Pin 42 Focus Error IC2A1 Pin 36 Pi IC2A1 Pin 57 RF IC201 Pin 88 SLED Drive FMO IC201 Pin 18 SLED FG IC2A1 Pin 42 Focus Error Focus Search IC2A1 Pin 83 Focus Drive FDO IC301 Pin 159 MPEG Clock 27MHz IC301 PIN 139 COMPONENT Y IC301 Pin 145 Component Pb IC301 Pin 151 Component Pr IC2A1 Pin 41 Tracking Error IC2A1 Pin 41 VBR TRACKING Error IC301 Pin 133 Composite IC301 Pin 151 Chrominance Sup...

Page 47: ...3 21 3 22 PRINTED CIRCUIT DIAGRAM DVD P C BOARD SOLDER SIDE ...

Page 48: ...3 23 3 24 DVD P C BOARD COMPONENT SIDE ...

Page 49: ... 2 6 8 9 GearMiddle 4 3 1 2 6 10 GearAssembly 1Screw 4 3 8 9 Rack 1 2 7 11 RubberRear 4 3 1 2 7 12 FrameAssembly 1Screw Bottom 4 4 1 2 13 BeltLoading 1LockingTab 4 4 1 2 13 14 GearPulley 4 4 1 2 13 14 15 GearLoading 1LockingTab 4 4 1 2 7 12 16 GuideUp Down 4 4 13 14 1 2 13 17 PWBAssembly 1LockingTab Bottom 4 4 Loading 1Hook 2Screw 1 2 7 12 18 BassMain 2LockingTabs 4 4 13 14 15 16 17 Note When reas...

Page 50: ...sembly Disc as Fig A 2 Lift up the Clamp Assembly Disc in direction of arrow A 3 Separate the Clamp Assembly Disc from the Holder Clamp 1 1 1 Plate Clamp 1 Turn the Plate Clamp to counterclockwise direction and then lift up the Plate Clamp 1 1 2 Magnet Clamp 1 1 3 Clamp Upper 2 Tray Disc Fig 4 2 1 Insert and push a Driver in the emergency eject hole A at the right side or put the Driver on the Lev...

Page 51: ...ction of arrow 3 2 Gear Middle 3 3 Gear Assembly Rack 1 Release the Scerw S3 4 Rubber Rear Fig 4 3 GEAR MIDDLE MOTOR ASSEMBLY SPINDLE MOTOR ASSEMBLY SPINDLE PICK UP ASSEMBLY GENERAL RUBBER REAR BASE PU OUTSERT GEAR ASSEMBLY FEED GAER ASSEMBLY RACK GEAR MIDDLE GEAR ASSEMBLY FEED PICK UP ASSEMBLY GENERAL GEAR ASSEMBLY RACK Fig 4 3 C2 S2 S2 S3 S2 C1 ...

Page 52: ...Fig 4 4 9 Guide Up Down Fig 4 4 1 Move the Guide Up Down in direction of arrow A as Fig A 2 Push the Locking Tab L5 down and then lift up the Guide Up Down to separate it from the Base Main When reassembling place the Guide Up Down as Fig C and move it in direction arrow B until it is locked by the Locking Tab L5 And confirm the Guide Up Down as Fig A 10 PWB Assembly Loading Put the Base Main face...

Page 53: ...454 276 277 289 300 352 A48 TUNER 302 353 A41 262 355 A00 306 306 310 305 A47 A40 301 273 275 253 SECTION 5 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION NOTE Refer to SECTION 7 REPLACEMENT PARTS LIST in order to look for the part number of each part ...

Page 54: ...16B MAGNET CLAMP LDM R608 10 5 1 1 5T 003 4860R 0006A CLAMP UPPER 004 4930R 0171A HOLDER CLAMP 008 4470R 0047A GEAR ASSYRACK 009 4470R 0053A GEAR MIDDLE 012 5040R 0047A RUBBER REAR E2 5040H 1054A YAMAUCHI 013 4400R 0006A BELT LOADING 014 4470R 0055A GEAR PULLEY 015 6871R 4508A PWB PCB ASSEMBLY TOTAL LD DP 2 MULTIHZ 016 4470R 0050A GEAR ASSYFEED 017 4470R 0056A GEAR LOADING 018 4974R 0023A GUIDE UP...

Page 55: ... NSP 853 3110RM0005A CASE REAR FE 3500TE DV25TE SATELLITE NSP 854 6871RU4116A PWB PCB ASSY SUBSET AUDIO FE 3500SE STANDARD 2P TERMINA NSP 855 6871RU4117A PWB PCB ASSY SUBSET AUDIO FE 3500TE STANDARD 2P WIRE 5 NSP 856 6871RU4117B PWB PCB ASSY SUBSET AUDIO FE 3500SE STANDARD 2P WIRE 10 NSP 857 3806RM0006A DECO FE 3500TE PLATE NSP 858 353M025U SCREW DRAWING 2 D3 0 L27 0 MSWR3 FZB 859 353M050H SCREW D...

Page 56: ...NSP 851 3720RMF010A PANEL FRONT FRONT SUB WF NSP 852 4766RM0006A FELT DUCT 300X10X1T BLACK NSP 853 3091RMW010A CABINET ASSY ASSY FE 3500WE ALL PB 12T NSP 854 4766RM0005A FELT WF FE 3500SW 470X7X1T BLACK NSP 855 6400RMSJ02A SPEAKER WOOFER CW 165B30L 8OHM 30 50W 8 856 3701RM0005A NET ASSY ASSY FE 3500WE SUBWOOFER NSP 857 6871RU3091A PWB ASSY SUBSET AUDIO SPKR CORD ASSY NSP 858 353M025C SCREW TAPTITE...

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