LG LGDVT418 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Car Receiver
  5. LGDVT418
  6. Service manual
LG LGDVT418 Service Manual

LG LGDVT418 Service Manual

Dvd/cd receiver
Hide thumbs Also See for LGDVT418:
Table of Contents

Advertisement

Quick Links

Download this manual
www.freeservicemanuals.info
2/10/2016
DVD/CD RECEIVER
SERVICE MANUAL
CD-R/RW
MODEL: LGDVT418
Published in Heiloo, Holland

Advertisement

Table of Contents
loading

Related Manuals for LG LGDVT418

Summary of Contents for LG LGDVT418

  • Page 1 2/10/2016 DVD/CD RECEIVER SERVICE MANUAL CD-R/RW MODEL: LGDVT418 Published in Heiloo, Holland...
  • Page 2 www.freeservicemanuals.info 2/10/2016 [CONTENTS] ❍ SECTION 1.GENERAL • SERVICING PRECAUTIONS ..........1-2 •...

  • Page 3: Section 1. General

    www.freeservicemanuals.info 2/10/2016 SECTION 1. GENERAL ❏ 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 4: Notes Regarding Compact Disc Player Repairs

    www.freeservicemanuals.info 2/10/2016 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 5 www.freeservicemanuals.info 2/10/2016 ❏ 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 6 www.freeservicemanuals.info 2/10/2016 ❏ SPECIFICATIONS - 1-5 - Published in Heiloo, Holland...
  • Page 7 www.freeservicemanuals.info 2/10/2016 MEMO - 1-6 - Published in Heiloo, Holland...

  • Page 8: Section 2. Audio Part

    www.freeservicemanuals.info 2/10/2016 SECTION 2. AUDIO PART ❏ ELECTRICAL TROUBLESHOOTING GUIDE 1. Power check flow INSERT POWER CORD. TURN ON CHECK POWER PLUG THE RED LED? AND POWER SUPPLY CIRCUIT . TURN POWER ON. IS POWER ON? CHECK POWER SUPPLY CIRCUIT . DOES INITIAL CHECK LASER CIRCUIT .
  • Page 9 www.freeservicemanuals.info 2/10/2016 2.AUDIO µ.COM CIRCUIT POWER ON Does AV 1/2, TV, AUDIO, Does CD/DVD OPTICAL IN, COAXIAL IN, FM87.5 appear at FLD? appear at FLD? Does it appear Does LOADING DVD Error at appear at FLD? FLD? Check Does no Disc or Connector(PN902)if Reconnet it.
  • Page 10 www.freeservicemanuals.info 2/10/2016 3.FRONT CIRCUIT (1/2) - 2-3 - Published in Heiloo, Holland...
  • Page 11 www.freeservicemanuals.info 2/10/2016 4.FRONT CIRCUIT (2/2) - 2-4 - Published in Heiloo, Holland...
  • Page 12 www.freeservicemanuals.info 2/10/2016 ❏ BLOCK DIAGRAM Published in Heiloo, Holland...

  • Page 13: Front Schematic Diagram

    www.freeservicemanuals.info 2/10/2016 ❏ SCHEMATIC DIAGRAMS • FRONT SCHEMATIC DIAGRAM Published in Heiloo, Holland...
  • Page 14 www.freeservicemanuals.info 2/10/2016 • MICOM SCHEMATIC DIAGRAM 2-10 Published in Heiloo, Holland...

  • Page 15: I//O Schematic Diagram

    www.freeservicemanuals.info 2/10/2016 • I//O SCHEMATIC DIAGRAM 2-11 2-12 Published in Heiloo, Holland...

  • Page 16: Dsp Schematic Diagram

    www.freeservicemanuals.info 2/10/2016 • DSP SCHEMATIC DIAGRAM 2-13 2-14 Published in Heiloo, Holland...

  • Page 17: Amp Schematic Diagram

    www.freeservicemanuals.info 2/10/2016 • AMP SCHEMATIC DIAGRAM 2-15 2-16 Published in Heiloo, Holland...
  • Page 18 www.freeservicemanuals.info 2/10/2016 • SMPS-WIDE SCHEMATIC DIAGRAM 2-17 2-18 Published in Heiloo, Holland...

  • Page 19: Power Schematic Diagram

    www.freeservicemanuals.info 2/10/2016 • POWER SCHEMATIC DIAGRAM 2-19 2-20 Published in Heiloo, Holland...
  • Page 20 www.freeservicemanuals.info 2/10/2016 ❏ WIRING DIAGRAMS 2-21 2-22 Published in Heiloo, Holland...
  • Page 21 www.freeservicemanuals.info 2/10/2016 ❏ PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD (COMPONENT SIDE) 2-23 2-24 Published in Heiloo, Holland...
  • Page 22 www.freeservicemanuals.info 2/10/2016 • MAIN P.C. BOARD (SOLDER SIDE) 2-25 2-26 Published in Heiloo, Holland...
  • Page 23 www.freeservicemanuals.info 2/10/2016 • FRONT P.C.BOARD (SOLDER SIDE) • FRONT P.C.BOARD (COMPONENT SIDE) 2-27 2-28 Published in Heiloo, Holland...

  • Page 24: Power P.c.board

    www.freeservicemanuals.info 2/10/2016 • POWER P.C.BOARD 2-29 2-30 Published in Heiloo, Holland...
  • Page 25 www.freeservicemanuals.info 2/10/2016 MEMO MEMO 2-31 2-32 Published in Heiloo, Holland...

  • Page 26: Section 3. Dvd Part

    www.freeservicemanuals.info 2/10/2016 SECTION 3. DVD PART ❏ ELECTRICAL TROUBLESHOOTING GUIDE 1. Power check flow - 3-1 - Published in Heiloo, Holland...
  • Page 27 www.freeservicemanuals.info 2/10/2016 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 28 www.freeservicemanuals.info 2/10/2016 3. Test & debug flow TEST Replace power PCBA or Check the AC Voltage 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 29 www.freeservicemanuals.info 2/10/2016 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 30 www.freeservicemanuals.info 2/10/2016 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.
  • Page 31 www.freeservicemanuals.info 2/10/2016 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 32 www.freeservicemanuals.info 2/10/2016 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 33 www.freeservicemanuals.info 2/10/2016 Normal Audio output Audio PWM IC received Check connection between MT1379 when disc playback? correct data stream? & Audio PWM IC. Check the related Normal Audio PWM IC circuit of Audio PWM IC. out? Check Audio filter,amplify,mute circuit. Communications between Normal IR.VFD &...

  • Page 34: System 27Mhz Clock,Reset,Flash R/W Signal

    www.freeservicemanuals.info 2/10/2016 ❏ DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 1) MT1379 main clock is at 27MHz(X501) FIG 1-1 2) MT1336 reset is high active FIG 1-2 - 3-9 - Published in Heiloo, Holland...
  • Page 35 www.freeservicemanuals.info 2/10/2016 3) RS232 waveform during procedure(Downloading) FIG 1-3 4) Flash R/W enable signal during download(Downloading) FIG 1-4 - 3-10 - Published in Heiloo, Holland...

  • Page 36: Sdram Clock

    www.freeservicemanuals.info 2/10/2016 2. SDRAM CLOCK 1) MT1379 main clock is at 27MHz(X501) FIG 2-1 3. TRAY OPEN/CLOSE SIGNAL FIG 3-1 - 3-11 - Published in Heiloo, Holland...

  • Page 37: Sled Control Related Signal (No Disc Condition)

    www.freeservicemanuals.info 2/10/2016 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) FIG 4-1 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FIG 5-1 - 3-12 - Published in Heiloo, Holland...
  • Page 38 www.freeservicemanuals.info 2/10/2016 6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) FIG 6-1 7. DISC TYPE JUDGEMENT W VEFORM FIG 7-1 - 3-13 - Published in Heiloo, Holland...
  • Page 39 www.freeservicemanuals.info 2/10/2016 FIG 7-2 (DVD) FIG 7-3 (CD) - 3-14 - Published in Heiloo, Holland...
  • Page 40 www.freeservicemanuals.info 2/10/2016 FIG 7-4 (CD) 8. FOCUS ON W VEFORM FIG 8-1 (DVD) - 3-15 - Published in Heiloo, Holland...
  • Page 41 www.freeservicemanuals.info 2/10/2016 FIG 8-2 (CD) 9. SPINDLE CONTROL W VEFORM (NO DISC CONDITION) FIG 9-1 - 3-16 - Published in Heiloo, Holland...

  • Page 42: Tracking Control Related Signal(System Checking)

    www.freeservicemanuals.info 2/10/2016 10. TRACKING CONTROL RELATED SIGNAL(System checking) FIG 10-1 (DVD) FIG 10-2 (CD) - 3-17 - Published in Heiloo, Holland...

  • Page 43: Mt1389 Video Output Waveform

    www.freeservicemanuals.info 2/10/2016 11. MT1389 AUDIO OPTICAL AND COAXIAL INPUT (SPDIF) FIG 11-1 (DVD) 12. MT1389 VIDEO OUTPUT WAVEFORM 1)100% FIG 12-1 - 3-18 - Published in Heiloo, Holland...

  • Page 44: Composite Video Signal

    www.freeservicemanuals.info 2/10/2016 2) COMPOSITE VIDEO SIGNAL FIG 12-2 13. MT1389 AUDIO OUTPUT TO PWM IC ADAT0~3 FIG 13-1 - 3-19 - Published in Heiloo, Holland...
  • Page 45 www.freeservicemanuals.info 2/10/2016 14. AUDIO OUTPUT FROM PWM IC FIG 14-1 - 3-20 - Published in Heiloo, Holland...
  • Page 46 www.freeservicemanuals.info 2/10/2016 ❏ BLOCK DIAGRAM 1. Overall Block Diagram CVBS - 3-21 - Published in Heiloo, Holland...
  • Page 47 www.freeservicemanuals.info 2/10/2016 2. SERVO Block Diagram - 3-22 - Published in Heiloo, Holland...

  • Page 48: Mpeg & Memory Block Diagram

    www.freeservicemanuals.info 2/10/2016 3. MPEG & MEMORY Block Diagram - 3-23 - Published in Heiloo, Holland...

  • Page 49: Video & Audio Block Diagram

    www.freeservicemanuals.info 2/10/2016 4. VIDEO & AUDIO Block Diagram - 3-24 - Published in Heiloo, Holland...
  • Page 50 www.freeservicemanuals.info 2/10/2016 ❏ DVD PART SCHEMATIC DIAGRAMS • MPEG SCHEMATIC DIAGRAM 3-25 3-26 Published in Heiloo, Holland...

  • Page 51: Servo Schematic Diagram

    www.freeservicemanuals.info 2/10/2016 • SERVO SCHEMATIC DIAGRAM 3-27 3-28 Published in Heiloo, Holland...

  • Page 52: Section 4. Exploded Views

    www.freeservicemanuals.info 2/10/2016 SECTION 4. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION NOTE) Refer to “SECTION 6 REPLACEMENT PARTS LIST” in order to look for the part number of each part. Published in Heiloo, Holland...

  • Page 53: Deck Mechanism Exploded View

    www.freeservicemanuals.info 2/10/2016 • DECK MECHANISM EXPLODED VIEW Published in Heiloo, Holland...

  • Page 54: Section 5. Speaker Part

    www.freeservicemanuals.info 2/10/2016 SECTION 5. SPEAKER PART ❏ MODEL: LHS-T6749W - 5-1 - Published in Heiloo, Holland...
  • Page 55 www.freeservicemanuals.info 2/10/2016 ❏ MODEL: LHS-T6749C - 5-2 - Published in Heiloo, Holland...
  • Page 56 www.freeservicemanuals.info 2/10/2016 ❏ MODEL: LHS-T6749T - 5-3 - Published in Heiloo, Holland...
  • Page 57 www.freeservicemanuals.info 2/10/2016 MEMO - 5-4 - Published in Heiloo, Holland...

Table of Contents