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LG LGDVB418 Manual

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CONTENTS
SECTION 1 . . . .SUMMARY
SECTION 2 . . . .CABINET & MAIN CHASSIS
SECTION 3 . . . .ELECTRICAL
SECTION 4 . . . .MECHANISM
SECTION 5 . . . .REPLACEMENT PARTS LIST

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Summary of Contents for LG LGDVB418

  • Page 1 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..MECHANISM SECTION 5 ..REPLACEMENT PARTS LIST...

  • Page 2: Table Of Contents

    SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ......1-3 SERVICING PRECAUTIONS ....................1-4 • General Servicing Precautions • Insulation Checking Prodedure • Electrostatically Sensitive Devices SPECIFICATIONS ........................1-5...

  • Page 3: Product Safety Servicing Guidelines For Video Products

    PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, SUBJECT : X-RADIATION NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER- TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY SONNEL COVER THE SUBJECT OF X-RADIATION.

  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION : Before servicing the DVD covered by this service Electrostatically Sensitive (ES) Devices data and its supplements and addends, read and follow the Some semiconductor (solid state) devices can be damaged SAFETY PRECAUTIONS. NOTE : if unforeseen circum- easily by static electricity.

  • Page 5: Specifications

    SPECIFICATIONS • GENERAL Power requirements: AC 100-240 V , 50/60 Hz Power consumption: Dimensions (Approx.): 430 x 39 x 242 mm (W x H x D) without foot Weight (Approx.): 2.2 kg Operating temperature: 5 °C to 35 °C (41 °F to 95 °F) Operating humidity: 5 % to 90 % •...
  • Page 6 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ........................2-2 1. Cabinet and Main Frame Section ...................2-2 2. Packing Accessory Section ....................2-3...
  • Page 7 EXPLODED VIEWS 1. Cabinet and Main Frame Section...
  • Page 8 2. Packing Accessory Section RF CABLE 810 CABLE SET ASS'Y PLUG ASS'Y 1WAY(YELLOW) PLUG ASS'Y 2WAY BATTERY PLUG ASS'Y 1WAY(BLACK) REMOCON OWNER'S MANUAL PACKING SHEET PACKING PACKING BOX CARTON OPTIONAL PARTS...
  • Page 9 SECTION 3 ELECTRICAL CONTENTS FEATURES FOR MEMORY CARD READ ................3-2 ELECTRICAL TROUBLESHOOTING GUIDE ..............3-3 1. Power check flow........................3-3 2. System operation flow ......................3-4 3. Test & debug flow ........................3-5 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....3-11 1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL.............3-11 2.

  • Page 10: Features For Memory Card Read

    FEATURES FOR MEMORY CARD READ 1. There will be a key in front panel to convert mode from disc ( or VCR or AUX ) to memory, vice versa. 2. In disc mode ( Any status ), if user press MEM key, we have to change the mode if there is memory card. If there is no memory card inserted, please shows warning messages after change to MEM mode.

  • Page 11: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. Power check flow No VF+ No 5V_A Is 5.2VA section working? Is 5.2VA section working? Is 5.2V present at emitter Check F102 No 5.2VA of Q107? Replace D102. Check F101 Replace Q107. Is there a DC voltage at Replace R101.

  • Page 12: System Operation Flow

    2. System operation flow Power On 1. 8032 initializes SERVO, DSP & RISC registers 2. Write RISC code to SDRAM 3. Reset RISC Show LOGO Tray Closed? Tray Close to Closed position SLED at Inner Side ? SLED Moves to Inner Positi on 1.

  • Page 13: Test & Debug Flow

    3. Test & debug flow TEST Check the AC Voltage Replace power PCBA or Power PCBA(110V or 220V) AC transformer. Switch on the Power PCBA Is the DC Voltage Repair or Replace Power PCBA outputs OK? (5V,1.8V,3.3V,8V,12V) Make sure the main PCBA don't short on VCCs and switch it on.
  • Page 14 RESET or Power On. Check connection lines between FLASH Flash Memory operates & MT1389 and the FLASH access time Show LOGO? properly? whether is suitable or not. Check connection lines between SDRAM works properly? SDRAM & MT1389 and the SDRAM is damaged.
  • Page 15 Does the SLED move Motor Driver STBY Check the connection line of to inner side when it is at Pin is High? STBY signal. outter position? Is FMSO DC Level higher Check the related circuit of than 1.4V? FMSO. SL+ and SL- output Check the amp circuit on motor properly? driver.
  • Page 16 Check the laser power circuit Laser turns on when LD01 or LD02 output on MT1336 and connecting to reading disc? properly? power transistor. Collector voltage of Check the related circuit on power transistor is OK? laser power transistor Check cable connection between transistor ouput and pick-up head.
  • Page 17 YE S Proper signals on Check connections between Focus ON OK? A,B,C,D of MT1389 MT1389 and pick-up head. Check the FOSO connection on Check FEO signal MT1389 and motor driver. on MT1389 Check FOSO signal on MT1389 Check the related Normal TEO Signal on Track On OK? circuit on MT1389...
  • Page 18 Normal Audio output Audio DAC received Check connection between MT1379 when disc playback? correct data stream? & Audio DAC. Normal Audio DAC Check the related out? circuit of Audio DAC. Check Audio filter,amplify,mute circuit. Communications between Normal IR.VFD & Front Check communication lines on IR.VFD Front pannel k ey &...

  • Page 19: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL. 1) MT1389 main clock is at 27MHz(X501) FIG 1-1 2) MT1389 reset is low active. FIG 1-2 3-11...
  • Page 20 3) RS232 waveform during procedure(Downloading) FIG 1-3 4) Flash R/W enable signal during download(Downloading) FIG 1-4 3-12...

  • Page 21: Sdram Clock

    2. SDRAM CLOCK FIG 2-1 3. TRAY OPEN/CLOSE SIGNAL FIG 3-1 3-13...

  • Page 22: Sled Control Related Signal(No Disc Condition)

    4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) FIG 4-1 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FIG 5-1 3-14...

  • Page 23: Laser Power Control Related Signal(No Disc Condition)

    6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) FIG 6-1 7. DISC TYPE JUDGEMENT WAVEFORM FIG 7-1 3-15...
  • Page 24 FIG 7-2 (DVD) FIG 7-3 (CD) 3-16...

  • Page 25: Focus On Waveform

    FIG 7-4 (CD) 8. FOCUS ON WAVEFORM FIG 8-1 (DVD) 3-17...

  • Page 26: Spindle Control Waveform

    FIG 8-2 (CD) 9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) FIG 9-1 3-18...

  • Page 27: Tracking Control Related Signal(System Checking)

    10. TRACKING CONTROL RELATED SIGNAL(System checking) FIG 10-1 (DVD) FIG 10-2 (CD) 3-19...

  • Page 28: Mt1389 Audio Optical And Coaxial Output (Spdif)

    11. MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF) FIG 11-1 (DVD) 12. MT1389 VIDEO OUTPUT WAVEFORM 1) 100% FIG 12-1 3-20...

  • Page 29: Mt1389 Audio Output To Audio Dac

    2) COMPOSITE VIDEO SIGNAL FIG 12-2 13. MT1389 AUDIO OUTPUT TO AUDIO DAC ASDATA3 FIG 13-1 3-21...

  • Page 30: Audio Output From Audio Dac

    14. AUDIO OUTPUT FROM AUDIO DAC FIG 14-1 3-22...

  • Page 31: Block Diagrams

    BLOCK DIAGRAMS 1. Overall Block Diagram CVBS 3-23...

  • Page 32: Power(Smps) Block Diagram

    2. Power(SMPS) Block Diagram TRANS SWITCHING IC RECTIFIER LINE FILTER 3-24...

  • Page 33: Servo Block Diagram

    3. SERVO Block Diagram 3-25...

  • Page 34: Mpeg & Memory Block Diagram

    4. MPEG & MEMORY Block Diagram 3-26...

  • Page 35: Video & Audio Block Diagram

    5. VIDEO & AUDIO Block Diagram 3-27...

  • Page 36: Circuit Diagrams

    2. Voltages are DC-measured with a digital voltmeter MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. FROM THE LG ELECTRONICS CORPORATION. ALL PERFORMANCE IMPROVEMENT CHANGES INTO COMPONENTS SHOULD BE REPLACED ONLY WITH THE SET IS NOT DELAYED UNTIL THE NEW SERVICE TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR- LITERATURE IS PRINTED.

  • Page 37: Av/Jack Circuit Diagram

    2. AV/JACK CIRCUIT DIAGRAM All Video signal isn't appear or bad 2CH Audio out bad. 2CH Audio out bad. 3-30 3-31...

  • Page 38: System Circuit Diagram

    3. SYSTEM CIRCUIT DIAGRAM 3-32 3-33...

  • Page 39: Driver Circuit Diagram

    4. DRIVER CIRCUIT DIAGRAM CD/DVD LD will not on 3-34 3-35...

  • Page 40: Timer Circuit Diagram

    5. TIMER CIRCUIT DIAGRAM Digital abnormal Remocon not operate System not operate or Remocon not operate Digitron abnormal or Key not operate. Digital abnormal 3-36 3-37...

  • Page 41: 1Ch, Scart Circuit Diagram

    6. 5.1CH, SCART CIRCUIT DIAGRAM 5.1CH Audio bad 3-38 3-39...

  • Page 42: Circuit Voltage Chart

    • CIRCUIT VOLTAGE CHART MODE MODE MODE MODE MODE MODE STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. IC201(MT1336E) 2.34 1.07 1.25 1.24 1.39 1.39 1.41 0.82...

  • Page 43: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS 1. MAIN P.C.BOARD LOCATION GUIDE 3-42 3-43...

  • Page 44: Key P.c.board

    2. KEY P.C.BOARD 3. TIMER P.C.BOARD (Solder Side) 3-44 3-45...

  • Page 45: Scart & 5.1Ch P.c.board(Optional Part)

    4. SCART & 5.1CH P.C.BOARD(OPTIONAL PART) 5. SMPS P.C.BOARD (Solder Side) (Solder Side) 3-46 3-47...
  • Page 46 SECTION 4 MECHANISM (DP-8) CONTENTS 5. Frame Assembly Up/Down ....4-4 DECK MECHANISM PARTS 6. Belt Loading........4-4 LOCATIONS 7. Gear Pulley ........4-4 8. Gear Loading ........4-4 • Top View..........4-1 9. Guide Up/Down.........4-4 • Top View(without Tray Disc) ....4-1 • Bottom View ...........4-1 10.
  • Page 47 DECK MECHANISM PARTS LOCATION • Top View (With Tray) Procedure Disass Fig- Parts Fixing Type embly Starting No. Main Base Clamp Assembly Disc 1, 2 Plate Clamp 1, 2, 3 Magnet Clamp 1, 2, 3, 4 Clamp Upper Tray Disc 1, 6 Base Assembly Sled 1, 2, 6...
  • Page 48 DECK MECHANISM DISASSEMBLY Fig. 4-1 Fig. 4-2 1. Main Base (Fig. 4-1) 2. Tray Disc (Fig. 4-2) 1-1. Clamp Assembly Disc 1) Insert and push a Driver in the emergency eject hole(A) at the right side, or put the Driver on the 1) Place the Clamp Assembly Disc as Fig.
  • Page 49 DECK MECHANISM DISASSEMBLY Fig. 4-3 3. Base Assembly Sled (Fig. 4-3) 3-3. Gear Rack 1) Release the Scerw(S3) 1) Release 4 Screw(S2). 2) Disconnect the FFC Connector(C1) 4. Rubber Rear (Fig. 4-3) 3-1. Gear Feed 3-2. Gear Middle...
  • Page 50 DECK MECHANISM DISASSEMBLY Fig. 4-4 5. Frame Assembly Up/Down (Fig. 4-4) 8. Gear Loading (Fig. 4-4) 9. Guide Up/Down (Fig. 4-4) Note 1) Move the Guide Up/Down in direction of arrow(A) as Put the Base Main face down(Bottom Side) Fig.(A) 1) Release the screw(S4) 2) Push the Locking Tab(L5) down and then lift up the 2) Unlock the Locking Tab(L3) in direction of arrow and...
  • Page 52 EXPLODED VIEWS 1. Deck Mechanism Exploded View 015A 012B 012A 012C 024A 035A...

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