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JVC LT-26DF7BC Service Manual

Wide lcd panel television
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SERVICE MANUAL
WIDE LCD PANEL TELEVISION
SERVICE MANUAL
12
YA487
2006
COPYRIGHT © 2006 Victor Company of Japan, Limited
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
LT-26DF7BC,
LT-26DF7BK

TABLE OF CONTENTS

COPYRIGHT © 2006 Victor Company of Japan, Limited
No.YA487
2006/12

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  • Page 1: Table Of Contents

    WIDE LCD PANEL TELEVISION YA487 2006 SERVICE MANUAL LT-26DF7BC, LT-26DF7BK COPYRIGHT © 2006 Victor Company of Japan, Limited TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items LT-26DF7BC LT-26DF7BK Dimensions ( W × H × D ) 70.0cm × 53.5cm × 22.0cm [Included stand] 70.0cm × 50.0cm × 12.8cm [TV only] Mass 12.0kg [Included stand] 10.3 kg [TV only] Power Input AC220 - 240V, 50Hz Power Consumption 160W (Standby: 2.7W)

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS [EXCEPT FOR UK] (1) The design of this product contains special hardware, (6) Isolation Check (Safety for Electrical Shock Hazard) many circuits and components specially for safety After re-assembling the product, always perform an purposes. For continued protection, no changes should be isolation check on the exposed metal parts of the cabinet made to the original design unless authorized in writing by (antenna terminals, video/audio input and output terminals,...
  • Page 4 SAFETY PRECAUTIONS [FOR UK] (1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits.
  • Page 5 INSTALLATION 1.3.1 HEAT DISSIPATION 1.3.3 NOTES ON HANDLING If the heat dissipation vent behind this unit is blocked, cooling (1) WHEN TAKING UNIT OUT OF A PACKING CASE efficiency may deteriorate and temperature inside the unit will When taking the unit out of a packing case, do not grasp rise.
  • Page 6 HANDLING LCD PANEL 1.4.1 PRECAUTIONS FOR TRANSPORTATION 1.4.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL) When transporting the unit, pressure exerted on the internal LCD (1) Avoid placing the unit under direct sunlight over a panel due to improper handling (such as tossing and dropping) prolonged period of time.

  • Page 7: Specific Service Instructions

    COLOUR SYSTEM If the picture is not clear or no colour appears, change the current colour system to another colour system. MAIN DIFFERENCE LIST Item LT-26DF7BC LT-26DF7BK POWER CORD EU type(2-pin) UK type(3-pin) REMOTE CONTROL UNIT VE-30044649(RM-C1897S) VE-30034033(RM-C1895)
  • Page 8 TECHNICAL INFORMATION 2.4.1 LCD PANEL This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.
  • Page 9 Menu Languages 2 SOUND1 Menu Subwoofer Tuner Options Subwoofer Level (dB) 26 AU V5 EX59 JVC PaNEU IDTV L7 V0.40 Subwoofer Corner Freq. (x10Hz) Menu Equalizer 2.5.2 HOW TO EXIT THE SERVICE MODE Menu Headphone Press the [MENU] key to exit the Service mode.
  • Page 10 Setting menu Setting items Setting menu Setting items TV Norm Menu Languages 2 Finnish Polish Czech Hungarian Russian Slovak Features PIP/PAP Slovenian Blue Background Rumanian Menu Transparency Bulgarian Menu Timeout Croatian Backlight Serbian Single Tuner Hebrew Dynamic WB Tuner Options Main Tuner Zoom Mode Blank PIP Tuner...

  • Page 11: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE NOTE: • Make sure that the power cord is disconnected from the outlet. • Pay special attention not to break or damage the parts. • When removing each board, remove the connectors as required. • Taking notes of the connecting points (connector numbers) makes service procedure manageable. •...
  • Page 12 BACK COVER HANGER WALL METAL AV JACK BRACKET FUNCTION BUTTON BRACKET AV JACK SIDE CONTROL AMPLIFIER FUNCTION BUTTON FRAME COMMON POWER INTERFACE COVER MAIN PWB DIGITAL TUNER COMMON INTERFACE NOISE BRACKET FILTER POWER INLET BRACKET LED PWB LCD PANEL SOCKET COVER UNIT BRACKET FRONT PANEL...
  • Page 13 MEMORY IC REPLACEMENT • This model uses the memory IC. • This memory IC stores data for proper operation of the video and drive circuits. • When replacing, be sure to use an IC containing this (initial value) data. 3.2.1 SETTINGS OF FACTORY SHIPMENT 3.2.1.1 BUTTON OPERATION 3.2.1.2...
  • Page 14 REPLACEMENT OF CHIP COMPONENT 3.3.1 CAUTIONS (1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it. 3.3.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.

  • Page 15: Adjustment

    SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT. SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.YA487)1-15...
  • Page 16 Victor company of Japn, Limited Display category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA487) Printed in Japan...
  • Page 17 PARTS LIST CAUTION The parts identified by the symbol are important for the safety . Whenever replacing these parts, be sure to use specified ones to secure the  safety. The parts not indicated in this Parts List and those which are filled with lines --- in the Parts No. columns will not be supplied. P.W.
  • Page 18 POWER P.W. BOARD ASS'Y (VE-20231595) ....................3-12 NOISE FILTER P.W. BOARD ASS'Y (VE-20265741) ..................3-13 PACKING ................................... 3-14 PACKING PARTS LIST ............................. 3-14 USING P.W. BOARD & REMOTE CONTROL UNIT P.W.B ASS'Y No. P.W.B ASS'Y name LT-26DF7BC LT-26DF7BK ← MAIN P.W.B VE-20286466 ← AV JACK P.W.B VE-20276050 ←...

  • Page 19: Exploded View Parts List

    FRAME SUPPORT (x4)  VE-30044850 LCD PANEL UNIT VE-30026617 TWEETER 8ohm 10W 1.2cm(x2) VE-40028974 LOGO JVC VE-30042222 E-HARNESS ASSY AMP PL705 - MAIN SPEAKER LEFT VE-30042854 E-HARNESS ASSY AMP PL706 - MAIN SPEAKER RIGHT VE-30040239 E-HARNESS ASSY MAIN PL600 - LED...

  • Page 20: Exploded View

    EXPLODED VIEW INVERTER PWB 3-4(No.YA487)

  • Page 21: Printed Wiring Board Parts List

    PRINTED WIRING BOARD PARTS LIST MAIN P.W. BOARD ASS'Y (VE-20286466) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local D209 VE-30038472 Z DIODE D210 VE-30038472 Z DIODE VE-30031769 D211 VE-30038472 Z DIODE IC201 VE-30021083 D212 VE-30038472...
  • Page 22 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C302 VE-30016654 CAPACITOR 100nF 16V K C452 VE-30016654 CAPACITOR 100nF 16V K C304 VE-30012569 CAPACITOR 33pF 50V J C454 VE-30016654 CAPACITOR 100nF 16V K C305 VE-30012572 CAPACITOR...
  • Page 23 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C930 VE-30000371 E CAPACITOR 22uF 50V M C1176 VE-30012581 CAPACITOR 1nF 50V K C932 VE-30016654 CAPACITOR 100nF 16V K C1177 VE-30012581 CAPACITOR 1nF 50V K C933 VE-30016654 CAPACITOR...
  • Page 24 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C2096 VE-30000393 E CAPACITOR 3.3uF 50V M R217 VE-30012641 RESISTOR 1/16W 10K J C2099 VE-30016654 CAPACITOR 100nF 16V K R218 VE-30012510 RESISTOR 1/16W 100R J C2101 VE-30000345 E CAPACITOR...
  • Page 25 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R433 VE-30012641 RESISTOR 1/16W 10K J R1044 VE-30012657 RESISTOR 1/16W 1K J R435 VE-30014078 RESISTOR 1/16W 22R J R1046 VE-30012713 RESISTOR 1/16W 75R J R436 VE-30014078 RESISTOR...
  • Page 26 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R2090 VE-30012696 RESISTOR 1/16W 47K J L406 VE-30020394 FERRITE R2091 VE-30012665 RESISTOR 1/16W 20K J L407 VE-30020394 FERRITE R2098 VE-30012669 RESISTOR 1/16W 22K J L408 VE-30020394 FERRITE...

  • Page 27: Av Jack P.w. Board Ass'y (Ve-20276050)

    AV JACK P.W. BOARD ASS'Y (VE-20276050) LED P.W. BOARD ASS'Y (VE-20275736) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local D100 VE-30038472 Z DIODE VE-30047579 D101 VE-30038472 Z DIODE D102 VE-30038472 Z DIODE VE-30001279 RED/GREEN D103...

  • Page 28: Power P.w. Board Ass'y (Ve-20231595)

    POWER P.W. BOARD ASS'Y (VE-20231595) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C801 VE-30000387 E CAPACITOR 33uF 50V M C802 VE-30039383 CAPACITOR 1uF 450V K VE-30015087 IC801 C805 VE-30012610 CAPACITOR 10nF 50V J IC802 VE-30039471 C806...

  • Page 29: Noise Filter P.w. Board Ass'y (Ve-20265741)

    Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R834 VE-30012641 RESISTOR 1/16W 10K J R965 VE-30000770 RESISTOR 1/4W 680R J R836 VE-30012644 RESISTOR 1/16W 12K J R966 VE-30012649 RESISTOR 1/16W 150R J R837 VE-30012649 RESISTOR...

  • Page 30: Packing

    PACKING PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local VE-50093734 CARTON BOX LT-26DF7BC VE-50093737 CARTON BOX LT-26DF7BK VE-20279799 CUSHION ASSEMBLY 4pcs in 1set VE-30044649 REMOTE CONTROL UNIT RM-C1897S LT-26DF7BC VE-30034033 REMOTE CONTROL UNIT RM-C1895 LT-26DF7BK  VE-50093735...
  • Page 31 SCHEMATIC DIAGRAMS WIDE LCD PANEL TELEVISION LT-26DF7BC, LT-26DF7BK CD-ROM No.SML200612 No.YA487 COPYRIGHT © 2006 Victor Company of Japan, Limited 2006/12...
  • Page 32 LT-26DF7BC, LT-26DF7BK STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY Type No indication : Ceramic capacitor The components identified by the symbol and shading are : Metalized mylar capacitor critical for safety. For continued safety replace safety ciritical : Polypropylene capacitor components only with manufactures recommended parts.
  • Page 33 SIDE CONTROL PWB PATTERN ......................2-37 AMPLIFIER PWB PATTERN ........................2-37 NOISE FILTER PWB PATTERN ........................ 2-38 LED PWB PATTERN ..........................2-38 USING P.W. BOARD P.W.B ASS’Y name LT-26DF7BC LT-26DF7BK VE-20286466 MAIN P.W. BOARD VE-20276050 AV JACK P.W. BOARD VE-20281984 SIDE CONTROL P.W.

  • Page 34: Wiring Diagram

    WIRING DIAGRAM DIGITAL TUNER INVERTER UNIT POWER PWB PL808 LCD PANEL UNIT PL204 PL101 PL203 PL201 SIDE PL106 PL807 PL202 PL801 PL806 CONTROL PL805 PL802 PL803 AMPLIFIER PL707 PL706 PL709 PL705 PL900 PL1004 PL901 PL600 PL104 PL103 PL301 PL1002 MAIN PWB PL308 PL206 PL101...

  • Page 35: Block Diagram

    BLOCK DIAGRAM M29W040B K6R4008V1C 24LC32A KEYPAD Flash Memory 16LV8 DC IN POWER SUPPLY IR CARD EM6A9320 TFT-LCD RGB SW1,2,3 HEADPHONE Mute_AMP, CPU_Go, DDR RAM PANEL CARD PDP_Go, SDA 5550M with SW_en for ProDown LVDS Out PCF8574 Up TXD,UP RXD Auto Mute 24-bit SVP EX52 digital...

  • Page 36: Circuit Diagrams

    CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/8) SHEET1 MAIN PWB ASS'Y(1/8) L2000 C2004 VE-20286466 Q2002 470p BC848B QSS_TUN2 L1003 SC1_AUDIO_L_OUT 26R_100MHZ_1.5A C2005 Q2001 R1013 BC848B 100R 12SIOMAD SC3_AUDIO_L_OUT C2006 R1004 R1029 100R 11 SCL TAGC 100R TUN2_CVBS R2004 100R Q2003 C1034 X1000 AUDIO_L_OUT...
  • Page 37 MAIN PWB CIRCUIT DIAGRAM (2/8) SHEET 2 EXT-1 EXT-2 VCCA_3V3 VCCA_3V3 VIDEO SWITCH TEA6415C C304 R229 D221 BZT55C10 330R MMC_CVBS PL203 L203 R249 R264 C284 IC210 DISP_EN/PDWN SC2_AUDIO_R_OUT C274 C282 D2003 SC1_V_IN Q200 PANEL_VCC L207 INPUT1 INPUT8 BC848B MAIN PICTURE TO SVP PDP_GO/BL_ON_OFF CPU_GO...
  • Page 38 MAIN PWB CIRCUIT DIAGRAM (3/8) SHEET 3 MAIN PWB ASS'Y(3/8) VE-20286466 S303 VCCD2_3V3 VCCD_3V3 C2046 DVS_2EX IC316 VCCD2_3V3 RGB_SW3 R2030 C362 VCC_5V C2047 C2048 L2010 STBY_5V SC1_R R2032 BLM21B201S VCC_5V 100n L308 SC2_R SC1_FB R2031 VCC_5V BLM21B201S 220n RGB_R_VPC PI5V330_SOIC SC2_FB VCCD2_3V3 SC1_G...
  • Page 39 MAIN PWB CIRCUIT DIAGRAM (4/8) SHEET 4 MAIN PWB ASS'Y(4/8) PAVDD1 VL1_8 R435 VE-20286466 C438 MLF1 PAVDD2 R436 IC400 IC401 S448 PLF2 C439 S447 R2214 DE_PING R2210 DE_PING B8 11 B8 11 D_PING[7] DIN[7] B7 12 330R_100MHZ_3A R432 B7 12 PDVDD L407 D_PING[6]...
  • Page 40 MAIN PWB CIRCUIT DIAGRAM (5/8) SHEET 5 MAIN PWB ASS'Y(5/8) VE-20286466 R500 MD[27] 100n C505 MD[26] C518 MD[25] R512 100u MD[24] C502 R501 MD[23] C525 MD[22] C516 MD[21] C524 100u MD[20] 100n R502 C523 MD[19] C532 MD[18] 100n C522 MD[17] DQ28_A9 VDD_D3 DQ29_A8...
  • Page 41 MAIN PWB CIRCUIT DIAGRAM (6/8) SHEET 6 MAIN PWB ASS'Y(6/8) VCCD3.3V_FLT L609 VCCD_3V3 BLM21B201S VE-20286466 STBY_3V3 IC623 WR_EMU STM6321 STBY_3V3 OPEN RST_H PDP_GO/BL_ON_OFF R632 CPU_GO S600 R6038 C610 Q6008 S607 R6037 100n SDA2 SDA3 Q6011 BC848B BC848B C605 CPU_GO1/STBY PDP_GO1/BL_ON_OFF BC848B 100n S608...
  • Page 42 MAIN PWB CIRCUIT DIAGRAM (7/8) SHEET 7 IC3000 LM1117 P1_5V VCC_5V HDMI_3V3_PLL VOUT HDMI_3V3 C3000 C3001 C3002 IC2013 100n 100u 100n C3003 C3004 100n 100u REGULATORLAR COK IYI 1 S 1 P1_HPD SOGUTULMALI DSDA IC2012 UPA672T MUMKUN OLDUGUNCA 9993 E YAKIN OLMALILAR 2 G 1 IC3001 VCC_5V...
  • Page 43 MAIN PWB CIRCUIT DIAGRAM (8/8) SHEET 8 L928 L918 POWER PWB ASS'Y VCC_12V PL806 (SHEET11) L926 PANEL_VCC1 L917 MAIN PWB ASS'Y(8/8) VCCA_3V3 L927 LG_1/IRQPDP PDP_GO1/BL_ON_OFF VE-20286466 L906 L909 STBY_5V PL900 STBY_3V3 L931 STBY_5V D905 FAN1616AS-3.3 SOT 223 L905 L923 L913 IC902 BA159_SMD +12V...

  • Page 44: Av Jack Pwb Circuit Diagram

    AV JACK PWB CIRCUIT DIAGRAM SHEET 9 MAIN PWB ASS'Y(1/8) MAIN PWB ASS'Y(3/8) DIGITAL MAIN PWB ASS'Y(2/8) PL1002 (SHEET1) TUNER PL301 (SHEET3) PL201 (SHEET2) AV JACK PWB ASS'Y VE-20276050 c17fav14-1_1003_1/1_0.0 (No.YA487)2-23 2-24(No.YA487)
  • Page 45 AMPLIFIER PWB CIRCUIT DIAGRAM SHEET 10 AMPLIFIER PWB ASS'Y VE-20270356 POWER PWB ASS'Y PL801 (SHEET11) MAIN SPEAKER(R) TWEETER(R) MAIN PWB ASS'Y(1/8) PL1004 (SHEET1) MAIN SPEAKER(L) TWEETER(L) c18amp06-4_1003_1/1_0.0 (No.YA487)2-25 2-26(No.YA487)

  • Page 46: Power Pwb Circuit Diagram

    POWER PWB CIRCUIT DIAGRAM SHEET 11 AMPLIFIER PWB ASS'Y PL707 (SHEET10) NOISE FILTER PWB ASS'Y PL101(SHEET13) INVERTER UNIT MAIN PWB ASS'Y(8/8) PL901 (SHEET8) DIGITAL TUNER POWER PWB ASS'Y VE-20231595 MAIN PWB ASS'Y(8/8) OPEN PL900 (SHEET8) MAIN PWB ASS'Y(8/8) PL902 (SHEET8) c17pw15-8_1003_1/1_0.0 (No.YA487)2-27 2-28(No.YA487)
  • Page 47 SIDE CONTROL PWB CIRCUIT DIAGRAM SHEET 12 LED PWB CIRCUIT DIAGRAM SHEET 14 MAIN PWB ASS'Y(6/8) PL606 (SHEET6) MAIN PWB ASS'Y(6/8) PL600 (SHEET6) SIDE CONTROL PWB ASS'Y VE-20281984 LED PWB ASS'Y VE-20275736 c17tk83-1_1003_1/1_0.0 c17LD53-1_1003_1/1_0.0 NOISE FILTER PWB CIRCUIT DIAGRAM SHEET 13 POWER PWB ASS'Y PL808 (SHEET11) NOISE FILTER PWB ASS'Y...

  • Page 48: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN [SOLDER SIDE] (No.YA487)2-31 2-32(No.YA487)
  • Page 49 MAIN PWB PATTERN [PARTS SIDE] (No.YA487)2-33 2-34(No.YA487)

  • Page 50: Power Pwb Pattern

    POWER PWB PATTERN (No.YA487)2-35 2-36(No.YA487)

  • Page 51: Av Jack Pwb Pattern

    AV JACK PWB PATTERN NOISE FILTER PWB PATTERN SIDE CONTROL PWB PATTERN AMPLIFIER PWB PATTERN LED PWB PATTERN (No.YA487)2-37 2-38(No.YA487)
  • Page 52 Victor company of Japn, Limited Display category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA487) Printed in Japan...

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