LG DA-3520 Service Manual
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LG DA-3520 Service Manual

LG DA-3520 Service Manual

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• SERVICING PRECAUTIONS ..................................................................................................................... 1-2
• ESD PRECAUTIONS .................................................................................................................................. 1-4
• SPECIFICATIONS ...................................................................................................................................... 1-5
• LOCATION OF CUSTOMER CONTROLS ................................................................................................. 1-6
• ELECTRICAL TROUBLESHOOTING GUDIE ............................................................................................ 2-1
• DVD PLAYER PROGRAM DOWNLOAD METHOD ................................................................................... 2-5
• 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
• ELECTRICAL TROUBLESHOOTING GUIDE ........................................................................................... 3-1
• BLOCK DIAGRAMS ..................................................................................................................................... 3-8
• SCHEMATIC DIAGRAMS .......................................................................................................................... 3-11
• WAVEFORMS ........................................................................................................................................... 3-19
• PRINTED CIRCUIT DIAGRAM ................................................................................................................. 3-21
SECTION 4. MECHANSIM ..............................................................................................................
SECTION 5. EXPLODED VIEWS ................................................................................................... 5-1
SECTION 6. SPEAKER PART ........................................................................................................ 6-1
SECTION 7. REPLACEMENT PARTS LIST .................................................................................. 7-1
CONTENTS
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  • Page 1: Table Of Contents

    CONTENTS SECTION 1. GENERAL • SERVICING PRECAUTIONS ........................1-2 • ESD PRECAUTIONS ..........................1-4 • SPECIFICATIONS ............................1-5 • LOCATION OF CUSTOMER CONTROLS ....................1-6 SECTION 2. AUDIO PART • ELECTRICAL TROUBLESHOOTING GUDIE .................... 2-1 • DVD PLAYER PROGRAM DOWNLOAD METHOD ................... 2-5 •...

  • Page 2: Section 1. General

    SECTION 1. GENERAL PART SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) 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. Storage in conductive bag Drop impact 2.
  • Page 3 NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

  • Page 4: Esd Precautions

    ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

  • Page 5: Specifications

    SPECIFICATIONS Power supply AC 220~240V, 50/60Hz Power consumption Mass 10.2 Ibs(4.6kg) [General] External dimensions (W x H x D) 360 x 82 x 388mm(14.2 x 3.2 x 15.3 inches) Operating conditions Temperature: 5˚C to 35˚C, Operation status: Horizontal Operating humidity 5% to 90% Laser Semiconductor laser, wavelength 650nm...

  • Page 6: Location Of Customer Controls

    LOCATION OF CUSTOMER CONTROLS FRONT PANEL POWER button and indicator Disc Tray OPEN/CLOSE button Remote sensor OPEN/CLOSE MENU/PREST PHONES STANDBY/ON FUNCTION TUNE/SKIP PLAY/PAUSE MEMORY TITLE MENU RETURN ENTER STOP/CLEAR FM/AM MONO/ST. RESET button (located at PHONE connector the bottem, see page 46.) FUNCTION VOLUME controller SKIP/TUNE...

  • Page 7: Rear Panel

    REAR PANEL FM 75Ω Coaxial Antenna Connector AM Antenna VIDEO 2(Input) Connector Connectors SPEAKER Connectors VIDEO 2 VIDEO 1 FRONT WOOFER SPEAKER (8‰) 75‰ AUDIO AUTO-NTSC-PAL VIDEO VIDEO WOOFER CLEAR SELECTION REAR ‰ ‰ S-VIDEO MONITOR ‰ VIDEO 1(Input/Output) POWER CORD Connect to an VIDEO SELECTOR Connectors AC 230V, 50Hz outlet only.
  • Page 8 REAR PANEL you will find instructions for each of the remote control functions in the appropriate sections of this instruction • manual. POWER button MUTE button POWER MUTE VIDEO 1 button VIDEO 1 button FM/AM CD/DVD VIDEO 1 VIDEO 2 SLEEP FM/AM button SLEEP button...

  • Page 9: Section 2. Audio Part

    SECTION 2. AUDIO PART ELECTRICAL TROUBLESHOOTING GUDIE Turn power on. Check power supply circuit. Is power on? Check laser circuit. Does initial read work? Check focus circuit. Check disc. Does it play? Check tracking servo circuit. Check audio circuit. Does it output audio? - 2-1 -...
  • Page 10 2. AUDIO µ. COM Circuit POWER ON Does Video1/2 Does CD/DVD FM 87.5 appear appear at FLT? at FLD? Does it appear Does LOADING DVD Error at appear at FLD? FLD? Check Does no Dise or Connector(CN103)if Reconnet it. Time appear at FLD? is normally.
  • Page 11 3. Front Circuit (1/2) POWER ON Check if Reconnec it. the CN401 LED OFF. is OK. Check if the Is digitron Refer to SMPS Part. Front power is on normally? OK(*1). Check Check if the Replace if the IC401 OSC Pin Check if all Buttens R 427 R 427.
  • Page 12 Front Circuit (2/2) Check Refer to Check if the if the Power part of the Refer to SMPS. power(SMPS). Power part of the Front is OK. Front is OK. Check if Check if CN401 Pins3, 4 R401~R415 Waverfrom Refer to Micom Replace R401~R415.

  • Page 13: Dvd Player Program Download Method

    DVD PLAYER PROGRAM DOWNLOAD METHOD 1. DVD player without CD-RW option 1-1) Download the DVD program from your PC as following procedure ACTION FLD display • Plug the Power cord out • Connect the Fixture for download (Refer to Deck Mechanism Adjustment) •...
  • Page 14 *use file 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 • Download the source file in the folder (Ex, If the source file is “lg_a3_korea.bin, “lg_dvd...

  • Page 15: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 2V/Div. 2V/Div. 500nS/Div. 500nS/Div. • IC 703 pin • IC 703 pin • SPDIF signal woveform during normal play. • Serial data output wavefrom during normal play. 2V/Div. 2V/Div. 500nS/Div. 500nS/Div. • IC 202 pin •...

  • Page 16: Internal Block Diagram Of Ics

    INTERNAL BLOCK DIAGRAM OF ICs ■ CXP 84332 PA0 to PA7 AN0 to AN7 A/D CONVERTER SPC700 CLOCK GEN./ CUP CORE SYSTEM CONTROL PB0 to PB6 14 BIT PWM GENERATOR PE4/PWM PC0 to PC7 PE2/RMC REMOCON FIFO PD0 to PD7 32K/40K BYTES 1120 BYTES PB1/CS0...
  • Page 17 symbol Description (Port D) 8-bit I/O port. I/O can be set in a unit of single bits. Incorporation of pull-up PD0 to PD7 resistor can be set through the software in a unit of 4 bits. (8 pins) PE0/EC0 Input/Input (Port E) External event inputs for timer/counter.(2 pins) PE1/EC1...
  • Page 18 ■ STA304 SCL SDA LEFT_A LRCKI/SYNC LEFT_B BICKI/BIT_CL RIGHT_A RIGHT_B SDI_1/SDATA_OUT SLEFT_A SDI_2/SDATA_IN SLEFT_B SRIGHT_A SRIGHT_B LFE_A S/PDIF LFE_B LRCKO BICKO SDO_1 SDO_2 SDO_3 AC’97 PowerDown RESET EAPD CKOUT PWDN ■ STA500 - 2-10 -...
  • Page 19 ■ CS4228 ■ CS49300 ■ CS8415A - 2-11 -...
  • Page 20 ■ µPD16311 ■ NJM2279 ■ NJU7312A - 2-12 -...

  • Page 21: Ic Voltage Sheet

    IC VOLTAGE SHEET ■ STA500 ■ STA304 ■ CX84332 (IC201, IC301, IC801) (IC202, IC302) (IC101) PIN No. Volt(V) PIN No. Volt(V) PIN No. Volt(V) PIN No. Volt(V) 27.5 27.5 27.5 27.5 ■ NJM 2279 (IC102) ■ CS8415(IC701) PIN No. Volt(V) PIN No.
  • Page 22 ■ UPD16311(IC401) ■ NJU7312AM(IC501) ■ CS49326(IC704) PIN No. Volt(V) PIN No. Volt(V) PIN No. Volt(V) PIN No. Volt(V) PIN No. Volt(V) PIN No. Volt(V) 28.9 2..4 ■ IC910 ■ IC921 ■ IC923 ■ CS4228 (IC705) PIN No. Volt(V) PIN No. Volt(V) PIN No.

  • Page 23: Block Diagram

    BLOCK DIAGRAM 2-15 2-16...

  • Page 24: Schematic Diagrams

    SHEMATIC DIAGRAMS • POWER SCHEMATIC DIAGRAM NOTE: Warning NOTE: Parts that are shaded are critical With respect Shaded(■) parts are critical for safety.Replace only to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
  • Page 25 • µ-COM & FRONT SCHEMATIC DIAGRAM 2-19 2-20...
  • Page 26 • DAP(Digital Amplifier Part) SCHEMATIC DIAGRAM 2-21 2-22...
  • Page 27 • DSP(DIGITAL AUDIO PROCESSING)SCHEMATIC DIAGRAM 2-23 2-24...

  • Page 28: Printed Circuit Diargams

    PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD(SOLDER SIDE) 2-25 2-26...
  • Page 29 • MAIN P.C. BOARD(COMPONENT SIDE) 2-27 2-28...
  • Page 30 • MAIN/FRONT P.C. BOARD(SOLDER SIDE) • MAIN/FRONT P.C. BOARD(COMPONENT SIDE) 2-29 2-30...
  • Page 31 • POWER P.C. BOARD NOTE: Warning NOTE: Parts that are shaded are critical With respect 1. Shaded(■) parts are critical for safety.Replace only to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.

  • Page 32: Section 3. Dvd Part

    SECTION 3. DVD PART ELECTRICAL TROUBLESHOOTING GUIDE 1. µ-COM Circuit A. Open/Close abnormal OPEN/CLOSE ABNORMAL Check Front. YES (If OK) Check the Reconnect it. connection of P5101. Check the connection of MD. Check IC501 Pins 13, 14. Refer to SERVO part. B.
  • Page 33 C. Picture abnormal PICTURE ABNORMAL Check the disc. Refer to Servo part If OK Check PLL IC of MPEG part YES (If OK) Check DSP YES (If OK) Check MPEG YES (If OK) Replace B/D C. Disc Error DISC ERROR Check Disc YES (If OK) Refer to Servo part...

  • Page 34: Mpeg Circuit

    2. MPEG Circuit Power is on Does LG Logo appear Check power & clock. on the screen? Does the Check CD/DVD DSP output moving picture of the DVD Disc Is MPEG data signal normal? signal. play on the screen normally? Check MPEG Decoder input signal.
  • Page 35 3. RF/Servo Circuit CHECK POINT(General) Does signal goes "High" to IC201 Pin194 when the power is on? Does signal pulse Check "2. -COM Part". input to IC201 Pins 58, 59 when the powe is on? Does Does TTL pulse output to Replace X301 or IC304 33.8688MHz clock input IC201 Pins 140, 142?
  • Page 36 No disc Power on Check loading Part. Push Pick-up to inner track to Does tray open or close? the end by hand. Does DECK assembly is defective. PMD03 Pin 7 change (Limit sw) high to low? Pressing the open/close key repeatedly , check the voltage of IC2M1 check -COM Part.
  • Page 37 DISC IN OPEN/CLOSE Fig.3. FOCUS ERROR waveform Check the focus error moving the Check IC2A1 Pin 1 1,12,13,14 FOCUS ON? lens up and down. in DVD Mode (IC2A1 Pin 42) IC201 no output : Pick-up is defective. Does the TTLlevel change at IC201 Replace IC201.
  • Page 38 CHECK A Fig.5. RF waveform Check RF Eye-Pattern. Check IC2A1 Pins 5, 6, 7, 8. No signal: Pick-up is defective RF : 1.5-1.6V(IC2A1 Pin 57) Does the sawtooth waveform emit Is the eye-pattern vivid? Does the 1.6V emit? Replace IC2A1. at IC2A1 Pin 41? Replace IC201.

  • Page 39: Block Diagrams

    BLOCK DIAGRAMS 1. RF/CD DSP/DVD DSP/DVD SERVO Block Diagram - 3-8 -...
  • Page 40 2. MPEG Block Diagram - 3-9 -...
  • Page 41 3. µ-COM Block Diagram - 3-10 -...

  • Page 42: Schematic Diagrams

    SCHEMATIC DIAGRAMS • DRIVE & RF SCHEMATIC DIAGRAM 3-11 3-12...
  • Page 43 • DVD DSP(DIGITAL SIGNAL PROCESSING)SCHEMATIC DIAGRAM 3-13 3-14...
  • Page 44 • µ-COM SCHEMATIC DIAGRAM 3-15 3-16...
  • Page 45 • MPEG SCHEMATIC DIAGRAM 3-17 3-18...

  • Page 46: Waveforms

    • WAVEFORMS Stop : 2.50MS/s 4 Acqs M20.0 s Glitch Ch1 2 Apr 1999 500mV 14:47:27 IC2A1 Pin 42, Focus Error IC2A1 Pin 41 IC2A1 Pin 41 IC301 Pin 133, Composite IC301 Pin 151, Chrominance IC301 Pin 145, Luminance IC2A1 Pin 36, Pi Tracking Error VBR TRACKING Error (Super video out Mode)

  • Page 47: Printed Circuit Diagram

    PRINTED CIRCUIT DIAGRAM • DVD P.C. BOARD(SOLDER SIDE) 3-21 3-22...
  • Page 48 • DVD P.C. BOARD(COMPONENT SIDE) 3-23 3-24...

  • Page 49: Section 4. Mechansim

    SECTION 4. MECHANISM ■ DECK MECHANISM PARTS LOCKATION • Top View(With Tray) Procedure Disass Fixing Type Parts Figure Starting No. embly Holder 2 Screws, Clamp 2 Locking Tabs 2 Clamp Assmbly 2 Locking Tabs Disc 1, 2 Plate Clamp 1, 2, 3 4 Magnet Clamp 1, 2, 3, 4 5 Clamp Upper...
  • Page 50 ■ DECK MECHANISM DISASSEMBLY 1. Holder Clamp (Fig. 4-1) HOLDER CLAMP 1) Release 2 Screws(S1). 2) Unhook 2 Locking Tabs(L1). CLAMP ASSEMBLY DISC PLATE CLAMP 3) Lift up the Holder Clamp and then MAGNET CLAMP separate it from the Base Main. CLAMP UPPER 1-1.
  • Page 51 (C2) GEAR ASSEMBLY FEED GEAR MIDDLE (S2) GEAR ASSEMBLY RACK (S2) (S3) (S2) PICK UP ASSEMBLY GENERAL BASE PU(OUTSERT) (C1) RUBBER REAR PICK UP ASSEMBLY GENERAL GEAR ASSEMBLY FEED GEAR MIDDLE MOTOR ASSEMBLY SPINDLE GAER ASSEMBLY RACK MOTOR ASSEMBLY SPINDLE Fig.
  • Page 52 GUIDE UP/DOWN GEAR LOADING (L6) GEAR PULLEY (L6) (L4) BASE BELT LOADING MAIN PWB ASSEMBLY LOADING (H1) (L6) (S5) BASE MAIN FRAME ASSEMBLY UP/DOWN (S4) (L5) GUIDE UP/DOWN Fig.(5) GUIDE UP/DOWN GUIDE UP/DOWN Fig.(C) Fig. 4-4 5. Frame Assembly Up/Down 8.

  • Page 53: Section 5. Exploded Views

    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. TUNER...

  • Page 54: Deck Mechanism Exploded View

    • Deck Mechanism Exploded View LOCA. NO. PART NO. DESCRIPTION SPECIFICATION 6721RJ0320A DECK ASSEMBLY,VIDEO DP-2RM(MULTI)-CKD-HZ 4861R-0006A CLAMP ASSY DISC(DP2) 3041R-0040A BASE ASSEMBLY MAIN(DP2,MULTI)-HZ 3041R-0041A BASE ASSEMBLY SLED(DP2,MULTI)-HZ 3300R-0547A PLATE CLAMP 5016H-1016B MAGNET CLAMP(LDM-R608,10*5,1*1.5T) 4860R-0006A CLAMP UPPER 4930R-0171A HOLDER CLAMP 4470R-0047A GEAR ASSY RACK 4470R-0053A...

  • Page 55: Section 6. Speaker Part

    SECTION 6. SPEAKER PART MODEL: FE-3500TE (LG BRAND) MODEL : FE - 3500TE NSP : Non SVC Parts RUN DATE : 07.JUNE.2002 LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS 3701RM0003A NET ASSY ASSY,FE-3500TE(SATELLITE) 6400RMSC02A SPEAKER,GENERAL MSF-30SB30L(P.M.S) SAMMI 4OHM 3720RMF009A PANEL,FRONT...
  • Page 56 SECTION 6. SPEAKER PART MODEL: FE-3500WE ( LG BRAND ) MODEL : FE - 3500WE RUN DATE : 07.JUNE.2002 NSP : Non SVC Parts LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS 3806RM0005A DECO RING (DV-3500 SUB WF) 3720RMF010A PANEL,FRONT FRONT SUB WF...

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