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JVC LT-26F80BU Service Manual

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SERVICE MANUAL
WIDE LCD PANEL TELEVISION
7 S ERVICE MANUAL
2007
YA534
COPYRIGHT © 2007 Victor Company of Japan, Limited
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
LT-26F80BU

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COPYRIGHT © 2007 Victor Company of Japan, Limited
No.YA534
2007/7

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  • Page 1: Table Of Contents

    YA534 2007 7 S ERVICE MANUAL LT-26F80BU COPYRIGHT © 2007 Victor Company of Japan, Limited TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 70.0cm × 53.5cm × 20.0cm [Included stand] 70.0cm × 50.0cm × 12.8cm [TV only] Mass 12.1kg [Included stand] 10.6kg [TV only] Power Input AC220 - 240V, 50Hz Power Consumption 160W (Standby: 2.7W) TV RF System CCIR (B/G, I, D/K, L)

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (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 INSTALLATION 1.2.1 HEAT DISSIPATION 1.2.3 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 5 HANDLING LCD PANEL 1.3.1 PRECAUTIONS FOR TRANSPORTATION 1.3.2 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 6: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES HDMI (High Definition Multimedia Interface) T-V LINK HDMI is the first industry supported, uncompressed, When you have a T-V LINK compatible VCR connected to the all digital audio/video interface. By connecting an EXT-2 Terminal on the TV,it is easier to set up the VCR and to HDMI compatible device, high definition pictures can view videos.
  • Page 7 TECHNICAL INFORMATION 2.3.1 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 8 Menu Language 2 SOUND1 Menu Subwoofer Tuner Options Subwoofer Level (dB) 26 CMO B1LO1 EX59 JVC L7 V0.65 Subwoofer Corner Freq. (x10Hz) Menu Equalizer 2.4.2 HOW TO EXIT THE SERVICE MODE Menu Headphone Press the [MENU] key to exit the Service mode.
  • Page 9 Setting menu Setting items Setting menu Setting items TV Norm Menu Language 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 10: 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 11 BACK COVER FUNCTION BUTTON BRACKET FUNCTION HANGER WALL BUTTON METAL SIDE CONTROL INVERTER PWB COVER INVERTER AV JACK AMPLIFIER BRACKET POWER AV JACK FRAME PANEL UNIT MAIN PWB NOISE FILTER POWER INLET LED PWB BRACKET SOCKET COVER BRACKET FOOT ASSEMBLY FRONT PANEL TWEETER MAIN SPEAKER...
  • Page 12 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 13 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 14: Adjustment

    SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT. SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. 1-14 (No.YA534)
  • Page 15 Victor company of Japan, Limited Display category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA534) Printed in Japan...
  • Page 16 1-16 (No.YA534)
  • Page 17 (No.YA534)1-17...
  • Page 18 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 19 CONTENTS USING P.W. BOARD & REMOTE CONTROL UNIT ....................3-2 EXPLODED VIEW PARTS LIST ..........................3-3 EXPLODED VIEW ..............................3-4 PRINTED WIRING BOARD PARTS LIST ........................3-5 MAIN P.W. BOARD ASS'Y (VE-20332945) ....................... 3-5 AV JACK P.W. BOARD ASS'Y (VE-20231873) ....................3-10 SIDE CONTROL P.W.

  • Page 20: Exploded View Parts List

    EXPLODED VIEW PARTS LIST  Ref.No. Part No. Part Name Description Local VE-20305185 FRONT PANEL  VE-40028974 LOGO JVC  VE-20273439 LED LENS  VE-20182772 IR LENS VE-30041403 MAIN SPEAKER 8ohm 12W 5.1x12.7cm(x2) VE-30026617 TWEETER 8ohm 10W 1.2cm(x2) VE-40024101 RUBBER BUSH...

  • Page 21: Exploded View

    EXPLODED VIEW INVERTER PWB 3-4(No.YA534)

  • Page 22: Printed Wiring Board Parts List

    PRINTED WIRING BOARD PARTS LIST MAIN P.W. BOARD ASS'Y (VE-20332945) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local D211 VE-30038472 Z DIODE D212 VE-30038472 Z DIODE VE-30031769 D213 VE-30038472 Z DIODE IC201 VE-30021083 D214 VE-30038472...
  • Page 23 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C317 VE-30000345 E CAPACITOR 10uF 50V M C458 VE-30015407 E CAPACITOR 10uF 16V C318 VE-30016126 CAPACITOR 220nF 16V K C459 VE-30015407 E CAPACITOR 10uF 16V C319 VE-30012583 CAPACITOR...
  • Page 24 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C936 VE-30016654 CAPACITOR 100nF 16V K C1181 VE-30000345 E CAPACITOR 10uF 50V M C937 VE-30016654 CAPACITOR 100nF 16V K C1183 VE-30012581 CAPACITOR 1nF 50V K C938 VE-30016654 CAPACITOR...
  • Page 25 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C2204 VE-30016654 CAPACITOR 100nF 16V K R229 VE-30014076 RESISTOR 1/16W 4.7R J C2205 VE-30016654 CAPACITOR 100nF 16V K R230 VE-30012510 RESISTOR 1/16W 100R J C2206 VE-30016654 CAPACITOR...
  • Page 26 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R513 VE-30012713 RESISTOR 1/16W 75R J R1094 VE-30012510 RESISTOR 1/16W 100R J R514 VE-30012713 RESISTOR 1/16W 75R J R1095 VE-30012510 RESISTOR 1/16W 100R J R515 VE-30012713 RESISTOR...

  • Page 27: Av Jack P.w. Board Ass'y (Ve-20231873)

    Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R2224 VE-30012510 RESISTOR 1/16W 100R J L911 VE-30032189 FIXED COIL 22uH R2225 VE-30012510 RESISTOR 1/16W 100R J L913 VE-30020529 FERRITE R2226 VE-30012510 RESISTOR 1/16W 100R J L914 VE-30002170 FERRITE CORE...

  • Page 28: Side Control P.w. Board Ass'y (Ve-20281984)

    AMPLIFIER P.W. BOARD ASS'Y (VE-20279752) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C109 VE-30012560 CAPACITOR 100pF 50V J C110 VE-30012560 CAPACITOR 100pF 50V J VE-30044042 R100 VE-30012695 RESISTOR 1/16W 470R J VE-30001458 TRANSISTOR R101...
  • Page 29 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local Q808 VE-30001457 TRANSISTOR C837 VE-30000352 E CAPACITOR 100uF 16V M Q810 VE-30001457 TRANSISTOR C838 VE-30000345 E CAPACITOR 10uF 50V M Q811 VE-30001458 TRANSISTOR C839 VE-30016654 CAPACITOR 100nF 16V K...

  • Page 30: Noise Filter P.w. Board Ass'y (Ve-20290553)

    Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R865 VE-30012641 RESISTOR 1/16W 10K J R997 VE-30000818 RESISTOR 1/10W 8.2K J R866 VE-30012641 RESISTOR 1/16W 10K J R998 VE-30000818 RESISTOR 1/10W 8.2K J R867 VE-30012712 RESISTOR...

  • Page 31: Packing

    PACKING PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local VE-50104953 CARTON BOX VE-20279799 SNOW BOX ASSY 4pcs in 1set VE-50038565 POLY BAG 1100x750mm VE-30034032 REMOTE CONTROL UNIT RM-C1860 VE-50104954 INST BOOK English/German/French/Italian/Spanish  VE-50104955 INST BOOK Dutch/Swedish/Danish/Norwegian/Finnish ...
  • Page 32 SCHEMATIC DIAGRAMS WIDE LCD PANEL TELEVISION LT-26F80BU CD-ROM No.SML200707 No.YA534 COPYRIGHT © 2007 Victor Company of Japan, Limited 2007/7...
  • Page 33 LT-26F80BU 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 34 AMPLIFIER PWB PATTERN ........................2-39 SIDE CONTROL PWB PATTERN ......................2-39 NOISE FILTER PWB PATTERN ........................ 2-40 LED PWB PATTERN ..........................2-40 USING P.W. BOARD P.W.B ASS’Y name LT-26F80BU VE-20332945 MAIN P.W. BOARD VE-20231873 AV JACK P.W. BOARD VE-20281984 SIDE CONTROL P.W. BOARD VE-20275736 LED P.W.

  • Page 35: Wiring Diagram

    WIRING DIAGRAM INVERTER PWB POWER PWB PL809 LCD PANEL UNIT SIDE PL801 CONTROL PL803 PL805 PL802 PL1004 PL901 PL600 PL900 PL103 PL705 PL706 PL707 PL1002 AMPLIFIER PL301 MAIN PWB PL709 PL101 PL606 AV JACK PL902 PL201 NOISE FILTER PL101 PL100 PL102 MAIN MAIN...

  • Page 36: 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 37: Circuit Diagrams

    CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/8) SHEET1 MAIN PWB ASS'Y(1/8) L2000 C2004 VE-20332945 Q2002 470p BC848B QSS_TUN2 L1003 SC1_AUDIO_L_OUT 26R_100MHZ_1.5A C2005 Q2001 R1013 BC848B 100R SIOMAD SC3_AUDIO_L_OUT C2006 R1004 R1029 100R TAGC 100R TUN2_CVBS R2004 100R Q2003 C1034 X1000 AUDIO_L_OUT BC848B R1008...
  • Page 38 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 SC1_V_IN C274 C282 D2003 Q200 PANEL_VCC L207 INPUT1 INPUT8 BC848B MAIN PICTURE TO SVP PDP_GO/BL_ON_OFF CPU_GO...
  • Page 39 MAIN PWB CIRCUIT DIAGRAM (3/8) SHEET 3 MAIN PWB ASS'Y(3/8) VE-20332945 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 SC2_FB PI5V330_SOIC VCCD2_3V3 SC1_G...
  • Page 40 MAIN PWB CIRCUIT DIAGRAM (4/8) SHEET 4 MAIN PWB ASS'Y(4/8) R435 PAVDD1 VL1_8 VE-20332945 C438 MLF1 R436 PAVDD2 IC400 IC401 S448 VCC 20 C439 S447 VCC 20 PLF2 GND 10 DE_PING R2214 GND 10 DE_PING R2210 B8 11 B8 11 D_PING[7] DIN[7] B7 12...
  • Page 41 MAIN PWB CIRCUIT DIAGRAM (5/8) SHEET 5 MAIN PWB ASS'Y(5/8) VE-20332945 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 42 MAIN PWB CIRCUIT DIAGRAM (6/8) SHEET 6 MAIN PWB ASS'Y(6/8) VCCD3.3V_FLT L609 VCCD_3V3 BLM21B201S VE-20332945 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 43 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 P1_HPD SOGUTULMALI DSDA IC2012 MUMKUN OLDUGUNCA 9993 E YAKIN OLMALILAR IC3001 VCC_5V RX1_RST# 24LC02 UPA672T...
  • Page 44 MAIN PWB CIRCUIT DIAGRAM (8/8) SHEET 8 L928 L918 POWER PWB ASS'Y VCC_12V PL805 (SHEET11) L926 PANEL_VCC1 L917 MAIN PWB ASS'Y(8/8) VCCA_3V3 L927 LG_1/IRQPDP PDP_GO1/BL_ON_OFF VE-20332945 L906 L909 STBY_5V PL900 STBY_3V3 L931 STBY_5V D905 FAN1616AS-3.3 SOT 223 L905 L923 L913 IC902 BA159_SMD +12V...

  • Page 45: Av Jack Pwb Circuit Diagram

    AV JACK PWB CIRCUIT DIAGRAM SHEET 9 AV JACK PWB ASS'Y MAIN PWB ASS'Y(2/8) MAIN PWB ASS'Y(3/8) MAIN PWB ASS'Y(1/8) PL201 (SHEET2) PL301 (SHEET3) PL1002 (SHEET1) VE-20231873 c17fav15-2_0618_1/1_0.0 (No.YA534)2-23 2-24(No.YA534)
  • Page 46 AMPLIFIER PWB CIRCUIT DIAGRAM SHEET 10 AMPLIFIER PWB ASS'Y VE-20279752 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.YA534)2-25 2-26(No.YA534)
  • Page 47 POWER PWB CIRCUIT DIAGRAM SHEET 11 TR806 SMPS-RESONANT_PFC +400V R819 R818 TR805 330k 330k Q829 Q828 BU2508AF MTP3N60E TRF_SAFE_TFT_RES Q815 R847 C890 D800 MTP6N60E/SSP7N60A GBU4M +400V PL801 IC807 D831 BA159_SMD R897 5VREF L816 450V SW_OFF R961 +400V L810 +24V C889 C888 2u7_RESONANT L802...
  • Page 48 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 c17tk83-2_1003_1/1_0.0 c17ld53-3_0618_1/1_0.0 NOISE FILTER PWB CIRCUIT DIAGRAM SHEET 13 POWER PWB ASS'Y PL809 (SHEET11) NOISE FILTER PWB ASS'Y...

  • Page 49: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN [SOLDER SIDE] (No.YA534)2-31 2-32(No.YA534)
  • Page 50 MAIN PWB PATTERN [PARTS SIDE] (No.YA534)2-33 2-34(No.YA534)

  • Page 51: Power Pwb Pattern

    POWER PWB PATTERN [SOLDER SIDE] (No.YA534)2-35 2-36(No.YA534)
  • Page 52 POWER PWB PATTERN [PARTS SIDE] (No.YA534)2-37 2-38(No.YA534)

  • Page 53: Av Jack Pwb Pattern

    AV JACK PWB PATTERN AMPLIFIER PWB PATTERN SIDE CONTROL PWB PATTERN (No.YA534)2-39...

  • Page 54: Noise Filter Pwb Pattern

    NOISE FILTER PWB PATTERN LED PWB PATTERN 2-40(No.YA534)
  • Page 55 Victor company of Japan, Limited Display category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA534) Printed in Japan...

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