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JVC TH-G40C Service Manual
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JVC TH-G40C Service Manual

JVC TH-G40C Service Manual

Dvd digital theater system
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SERVICE MANUAL
DVD DIGITAL THEATER SYSTEM
9 S ERVICE MANUAL
2008
MB672<Rev.002>
TH-G40J, TH-G40C, TH-G40UJ,
TH-G40
TH-G30
COPYRIGHT © 2008 Victor Company of Japan, Limited
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
TH-G30J, TH-G30C
SP-THG50F
SP-THG50C
XV-THG40
SP-THG50F
SP-THG50C
XV-THG30

TABLE OF CONTENTS

COPYRIGHT © 2008 Victor Company of Japan, Limited
SP-THG50W
SP-THG50F (for Rear)
SP-THG50W
SP-THG50F (for Rear)
No.MB672<Rev.002>
2008/9

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Summary of Contents for JVC TH-G40C

  • Page 1: Table Of Contents

    SERVICE MANUAL DVD DIGITAL THEATER SYSTEM MB672<Rev.002> 2008 9 S ERVICE MANUAL TH-G40J, TH-G40C, TH-G40UJ, TH-G30J, TH-G30C SP-THG50W TH-G40 SP-THG50F SP-THG50F (for Rear) SP-THG50C XV-THG40 SP-THG50W TH-G30 SP-THG50F SP-THG50F (for Rear) SP-THG50C XV-THG30 COPYRIGHT © 2008 Victor Company of Japan, Limited...
  • Page 2 SPECIFICATION TH-G40 General Power supply Refer to main label. Power consumption Refer to main label. Net Weight 4 kg External dimensions (W x H x D) 430 x 72 x 307 mm Operating conditions Temperature: 5°C to 35°C Operation status: Horizontal Operating humidity 5% to 85% Laser...
  • Page 3 center speaker Type 1 Way 1 Speaker 4 Ω Impedance Frequency Response 120 -20000 Hz Sound Pressure Level 83 dB/W (1m) Rated Input Power 155 W Max. Input Power 310 W Net Dimensions (W x H x D) 300 x 115 x 111 mm Net Weight 1.1 kg Passive Subwoofer...
  • Page 4 Surround mode Front: 155 W + 155 W (THD 10 %) (* Depending on the sound mode center*: 155 W settings and the source Surround*: 155 W + 155 W (4Ω at 1 kHz,THD 10 %) there may be no sound output.) Subwoofer*: 225 W (3Ω...
  • Page 5 TH-G30 General Power supply Refer to main label. Power consumption Refer to main label. Net Weight 4 kg External dimensions (W x H x D) 430 x 72 x 307 mm Operating conditions Temperature: 5°C to 35°C Operation status: Horizontal Operating humidity 5% to 85% Laser...
  • Page 6 center speaker Type 1 Way 1 Speaker 4 Ω Impedance Frequency Response 120 -20000 Hz Sound Pressure Level 83 dB/W (1m) Rated Input Power 155 W Max. Input Power 310 W Net Dimensions (W x H x D) 300 x 115 x 111 mm Net Weight 1.1 kg Passive Subwoofer...

  • Page 7: Precaution

    SECTION 1 PRECAUTION Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across...
  • Page 8 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
  • Page 9 Important for laser products 1.CLASS 1 LASER PRODUCT 5.CAUTION : If safety switches malfunction, the laser is able to function. 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation 6.CAUTION : Use of controls, adjustments or performance of when open.

  • Page 10: Specific Service Instructions

    Importance admistering point on the safety slow blow type / type a fusion lent Full Fuse Replacement Marking Marquage Pour Le Remplacement Complet De Fusible Graphic symbol mark Le symbole graphique (Ce symbole signifie (This symbol means slow blow type fuse.) fusible de type a fusion lent.) should be read as follows ;...

  • Page 11: Disassembly

    SECTION 3 DISASSEMBLY Main body 3.1.1 Removing the Metal cover (See Fig. 1, 2) (1) Remove the three screws A attaching the Metal cover. (See Fig.1) (2) Remove the four screws B attaching the both side of the Metal cover. (See Fig.2) Fig.1 Fig.2 3.1.2 Removing the Front Panel (See Fig.
  • Page 12 3.1.3 Removing the HDMI board (See Fig. 7, 8) (1) Remove the one screw C attaching the HDMI board. (See Fig.7) (2) Disconnect the card wire from Main board connected to connector CN810 of the HDMI board. (See Fig.8) (3) Remove the three screws D attaching the HDMI board. (See Fig.8) Fig.7 CN810...

  • Page 13: See Fig.

    3.1.5 Removing the Rear panel (See Fig.10, 11) (1) Disconnect the Power cord from connector PN901 of the SMPS board. (See Fig.10) (2) Disconnect the connector wire from FAN connected to con- nector PN603 of the Amp board. (See Fig.10) PN901 (3) Remove the one screw F and seven screws G attaching the Rear panel.
  • Page 14 3.1.7 Removing the Main board (See Fig.13, 14) (1) Remove the two screws J attaching the bracket. (See Fig.13) (2) Disconnect the connector wire from Main board connected to connector CN901 of the SMPS board. (See Fig.14) (3) Disconnect the card wires from Amp board connected to connector PN202 PN203...
  • Page 15 3.1.9 Removing the Amp board (See Fig.16) (1) Remove the four screws M attaching the Amp board. Fig.16 3.1.10 Removing the Front key board (See Fig.17) (1) Remove the one screw N attaching the Front key board. Fig.17 3.1.11 Removing the FL board (See Fig.18) (1) Remove the five screws P attaching the FL board.
  • Page 16 DVD mechanism 3.2.1 Main base (See Fig.1) Main base (1) Place the disc clamp assembly as Fig.1. Disc clamp assembly (2) Lift up the disc clamp assembly in direction of the arrow (A). Clamper plate (3) Separate the disc clamp assembly from the Clamp holder. Magnet clamp (4) Turn the Clamper plate to counterclockwise direction and then lift up the clamper plate.
  • Page 17 3.2.3 Slide base assembly (See Fig.3) (1) Release the four screws (S2). Rubber damper (2) Disconnect the FFC connector (C1). Distinguish upper and (3) Release the screw (S3). lower sides (Assemble with care) Rubber damper Pickup base (S2) (S2) (S2) (S3) (C1) Rubber damper...

  • Page 18: No.mb672)1

    3.2.4 Up/Down frame assembly (See Fig.4) NOTE: Put the Main base face down (Bottom side) (1) Release the screw (S4). (2) Unlock the Locking tab (L3) in direction of arrow and then lift up the Up/down frame assembly to separate it from the Main base. NOTE: When reassembling move the Up/Down guide in direction of arrow (C) until it is positioned as Fig (C).

  • Page 19: Adjustment

    SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT. (No.MB672<Rev.002>)1-19...

  • Page 20: Troubleshooting

    SECTION 5 TROUBLESHOOTING Power Supply Circuit Insert power cord. Check power plug and power Is the Digitron on correctly? supply circuit. Turn power on. Check power supply circuit. Is power on? Check laser circuit. Does initial read work? Check focus circuit. Check disc.
  • Page 21 Front circuit Power on. Check if Reconnect it. Blue LED turn off? PN301 is ok? Check if the front Is the Digitron on Refer to SMPS part. power is ok? correctly? Check if Check pattern and resoldering DIS301 is ok? Check if the Check if all power part of the...
  • Page 22 System operation flow Power on. 1. 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 position. 1. Judge whether have disc and disc type. 2.
  • Page 23 AMP Protection "PROTECTION" appears on the FLD. After unplug power cord, connect again. Power on. "PROTECTION" appears continuously on the FLD. Is the IC101 pin54 Replace IC101. "LOW" signal(0V)? Replace the Q703, Q704 and Q705. Is the Q703, Q704 and Q705 normal? Replace TI AMP IC(IC701, IC702, IC703, IC704) (No.MB672<Rev.002>)1-23...
  • Page 24 AUDIO Micom Circuit (DVD & AMP) Power On. Does Does AV1, CD/DVD appear at TV AUDIO, AV1 OPT and FM 87.5 appear FLD? at FLD. Does Does Loading appear it appear DVD Error at FLD? at FLD? Does Check no Disc or Time power part of Main Refer to SMPS.
  • Page 25 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 5.6.1 SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 1) ES8391 main clock is at 27MHz(X501) 2) ES8391 reset is high active. IC101 PWR_CTL DVD_RESET MRST# IC501 (No.MB672<Rev.002>)1-25...
  • Page 26 5.6.2 SDRAM CLOCK 1) ES8391 main clock is at 27MHz(X501) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V 5.6.3 TRAY OPEN/CLOSE SIGNAL 1) Tray open/close waveform 2) Tray close waveform OPENSW OPENSW CLOSESW CLOSESW OPEN OPEN CLOSE CLOSE 3) Tray open waveform OPENSW CLOSESW OPEN CLOSE...
  • Page 27 5.6.4 SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) 5.6.5 LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) IC501 (No.MB672<Rev.002>)1-27...
  • Page 28 5.6.6 LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) IC501 1-28 (No.MB672<Rev.002>)
  • Page 29 5.6.7 DISC TYPE JUDGEMENT WAVEFORMS CD_DVDCT CD_DVDCT (DVD) (DVD) CD_DVDCT CD_DVDCT (CD) (CD) IC501 (No.MB672<Rev.002>)1-29...
  • Page 30 5.6.8 FOCUS ON WAVEFORMS CD_DVDCT IC501 (DVD) CD_DVDCT (DVD) 5.6.9 SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) SPINO IC501 1-30 (No.MB672<Rev.002>)
  • Page 31 5.6.10 TRACKING CONTROL RELATED SIGNAL(System checking) CD_DVDCT IC501 (DVD) CD_DVDCT IC501 (CD) (No.MB672<Rev.002>)1-31...
  • Page 32 5.6.11 ES8391 VIDEO OUTPUT WAVEFORMS 1) Full colorbar signal(COMPOSIT) IC501 2) Y 5.6.12 AUDIO OUTPUT FROM PWM IC 1) Audio related Signal IC501 IC501 1-32 (No.MB672<Rev.002>)
  • Page 33 5.6.13 DVD & AMP WAVEFORMS FL+ : TP611 -> R705 FR+ : TP609 -> R718 FL- : TP612 -> R710 FR- : TP610 -> R722 RL+ : TP603 -> R775 RR+ : TP601 -> R788 RL- : TP604 -> R780 RR- : TP602 ->...
  • Page 34 Victor Company of Japan, Limited Audio/Video Systems category 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.MB672<Rev.002>) Printed in Japan...

This manual is also suitable for:

Th-g40jTh-g40ujTh-g30jTh-g30c