LG LH-T6447D Service Manual
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LG LH-T6447D Service Manual

Dvd/cd receiver
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DVD/CD RECEIVER
SERVICE MANUAL
CD-R/RW
MODEL: LH-T6447D
LHS-T6447C, LHS-T6447W, LHS-T6447T

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Summary of Contents for LG LH-T6447D

  • Page 1 DVD/CD RECEIVER SERVICE MANUAL CD-R/RW MODEL: LH-T6447D LHS-T6447C, LHS-T6447W, LHS-T6447T...
  • Page 2 [CONTENTS] ❍ SECTION 1.GENERAL • SERVICING PRECAUTIONS ..........1-2 •...

  • Page 3: Section 1. General

    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

    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 ❏ 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 ❏ SPECIFICATIONS Power supply Refer to main label Power consumption er to main label Mass 4.4kg External dimensions (W x H x D) 430 x 60 x 350 mm Operating conditions Temperature: 5°C to 35°C, Operation status: Horizontal Operating humidity 5% to 85% Laser Semiconductor laser, wavelength 650 nm...
  • Page 7 MEMO - 1-6 -...

  • Page 8: Section 2. Audio Part

    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 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 3.FRONT CIRCUIT (1/2) - 2-3 -...
  • Page 11 4.FRONT CIRCUIT (2/2) - 2-4 -...
  • Page 12 ❏ BLOCK DIAGRAM...

  • Page 13: Front Schematic Diagram

    ❏ SCHEMATIC DIAGRAMS • FRONT SCHEMATIC DIAGRAM...
  • Page 14 • MICOM SCHEMATIC DIAGRAM 2-10...

  • Page 15: I/O Schematic Diagram

    • I/O SCHEMATIC DIAGRAM 2-11 2-12...

  • Page 16: Dsp Schematic Diagram

    • DSP SCHEMATIC DIAGRAM 2-13 2-14...

  • Page 17: Amp Schematic Diagram

    • AMP SCHEMATIC DIAGRAM 2-15 2-16...

  • Page 18: Smps Schematic Diagram

    • SMPS SCHEMATIC DIAGRAM 2-17 2-18...

  • Page 19: Power Schematic Diagram

    • POWER SCHEMATIC DIAGRAM 2-19 2-20...
  • Page 20 ❏ WIRING DIAGRAMS 2-21 2-22...
  • Page 21 ❏ PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD (COMPONENT SIDE) 2-23 2-24...
  • Page 22 • MAIN P.C. BOARD (SOLDER SIDE) 2-25 2-26...

  • Page 23: Front P.c.board

    • FRONT P.C.BOARD 2-27 2-28...

  • Page 24: Power P.c.board

    • POWER P.C.BOARD 2-29 2-30...
  • Page 25 MEMO MEMO 2-31 2-32...

  • Page 26: Section 3. Dvd Part

    SECTION 3. DVD PART ❏ ELECTRICAL TROUBLESHOOTING GUIDE 1. Power check flow - 3-1 -...
  • Page 27 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 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 29 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 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 31 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 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 MT1389?
  • Page 33 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

    ❏ 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) MT1336 reset is high active FIG 1-2 - 3-9 -...
  • Page 35 3) RS232 waveform during procedure(Downloading) FIG 1-3 4) Flash R/W enable signal during download(Downloading) FIG 1-4 - 3-10 -...

  • Page 36: Sdram Clock

    2. SDRAM CLOCK 1) MT1389 main clock is at 27MHz(X501) FIG 2-1 3. TRAY OPEN/CLOSE SIGNAL FIG 3-1 - 3-11 -...

  • Page 37: 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 - 3-12 -...

  • Page 38: Disc Type Judgement Waveform

    6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) FIG 6-1 7. DISC TYPE JUDGEMENT WAVEFORM FIG 7-1 - 3-13 -...
  • Page 39 FIG 7-2 (DVD) FIG 7-3 (CD) - 3-14 -...

  • Page 40: Focus On Waveform

    FIG 7-4 (CD) 8. FOCUS ON WAVEFORM FIG 8-1 (DVD) - 3-15 -...

  • Page 41: Spindle Control Waveform (No Disc Condition)

    FIG 8-2 (CD) 9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) FIG 9-1 - 3-16 -...

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

    10. TRACKING CONTROL RELATED SIGNAL(System checking) FIG 10-1 (DVD) FIG 10-2 (CD) - 3-17 -...

  • Page 43: Mt1389 Video Output Waveform

    11. MT1389 AUDIO OPTICAL AND COAXIAL INPUT (SPDIF) FIG 11-1 (DVD) 12. MT1389 VIDEO OUTPUT WAVEFORM 1)100% FIG 12-1 - 3-18 -...

  • Page 44: Composite Video Signal

    2) COMPOSITE VIDEO SIGNAL FIG 12-2 13. MT1389 AUDIO OUTPUT TO PWM IC ADAT0~3 FIG 13-1 - 3-19 -...
  • Page 45 14. AUDIO OUTPUT FROM PWM IC FIG 14-1 - 3-20 -...
  • Page 46 ❏ BLOCK DIAGRAM 1. Overall Block Diagram CVBS - 3-21 -...
  • Page 47 2. SERVO Block Diagram - 3-22 -...

  • Page 48: Mpeg & Memory Block Diagram

    3. MPEG & MEMORY Block Diagram - 3-23 -...

  • Page 49: Video & Audio Block Diagram

    4. VIDEO & AUDIO Block Diagram - 3-24 -...
  • Page 50 ❏ DVD PART SCHEMATIC DIAGRAMS • MPEG SCHEMATIC DIAGRAM 3-25 3-26...

  • Page 51: Servo Schematic Diagram

    • SERVO SCHEMATIC DIAGRAM 3-27 3-28...

  • Page 52: Section 4. Exploded Views

    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.

  • Page 53: Deck Mechanism Exploded View

    • DECK MECHANISM EXPLODED VIEW...

  • Page 54: Section 5. Speaker Part

    SECTION 5. SPEAKER PART ❏ MODEL: LHS-T6447C - 5-1 -...
  • Page 55 ❏ MODEL: LHS-T6447T - 5-2 -...
  • Page 56 ❏ MODEL: LHS-T6447W - 5-3 -...
  • Page 57 MEMO - 5-4 -...

This manual is also suitable for:

Lhs-t6447cLhs-t6447wLhs-t6447t

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