JVC LT-20J50SJ Service Manual
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JVC LT-20J50SJ Service Manual

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SERVICE MANUAL
5
2006
YA413
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
LCD PANEL TELEVISION
LT-20J50SJ,
LT-20J50SU

TABLE OF CONTENTS

COPYRIGHT © 2006 Victor Company of Japan, Limited
No.YA413
2006/5

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  • Page 1: Table Of Contents

    LCD PANEL TELEVISION YA413 2006 LT-20J50SJ, LT-20J50SU TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 53.0cm × 47.7cm × 21.3cm [Included stand] 53.0cm × 44.0cm × 12.5cm [TV only] Mass 8.2kg [Included stand] 7.2kg [TV only] Power Input ADAPTOR AC100 - 240V 50Hz DC12V Power Consumption 60W (Standby:1.2W) TV RF System...

  • 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

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES ZOOM COLOUR SYSTEM This function can change the screen size according to the If the picture is not clear or no colour appears, change the picture aspect ratio. current colour system to another colour system. OFF TIMER This function can set the TV to automatically turn off after a set time.
  • Page 8 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 9: 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 10 HANDLE BACK COVER SIDE CONTROL PWB FUNCTION BUTTON AV JACK PWB MAIN PWB METAL HANG CABLE HOLDER BACK DOOR BRACKET SOCKET CABLE COVER HOLDER LED PWB LCD PANEL UNIT HINGE COVER DISPLAY SUPPORT FOOT TOP COVER SPEAKER LED LENS FOOT ASSEMBLY FRONT COVER 1-10 (No.YA413)
  • Page 11 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 12 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 13: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION (1) The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values. (2) Make sure that connection is correctly made to AC power source.
  • Page 14 4.2.5 UOCIII SERVICE MODE SETTING ITEMS Item Setting Variable Setting Function items range value Item Setting Variable Setting Function 051 OP BILING items range value 052 OP HP 000 EurAsia TVSub 00.95 053 OP EQUAL 001 Init TV Sets the UOC default values and turns the tv to Stdby 054 OP DOLBY 002 ISP Mode...
  • Page 15 Item Setting Variable Setting Item Setting Variable Setting Function Function items range value items range value 108 PA-TR-TH 0-63 165 LPG 109 PA-LM-TH 166 PGR UOC Red Contrast 0-127 110 PA-ST-TH 167 PGG-CVBS UOC Green Contrast for CVBS input 0-127 111 PA-LO-TH 168 PGG-RGB UOC Green Contrast for RGB input...
  • Page 16 4.3.5 PW SERVICE MODE SETTING ITEMS Setting menu Setting items Setting value Service Submenu 1 UOC Hposition ADC_Calibration UOC_Calibration Service Submenu 2 Panel Type AU_20_VGA_V4WB Init NVM PC Mode Burn-In Mode Factory Settings 1 Initial APS Language English Country Model Name Setting items Setting value Setting menu...

  • Page 17: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.YA413)1-17...
  • Page 18 Victor Company of Japan, Limited Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA413) Printed in Japan...
  • Page 19 ENGLISH DEUTSCH FRANÇAIS ITALIANO CASTELLANO CASTELLANO LT-20J50SU LCD PANEL TV INSTRUCTIONS LCD-TV-GERÄT LCD-TV-GERÄT BEDIENUNGSANLEITUNG PANNEAU LCD TELEVISEUR PANNEAU LCD TELEVISEUR MANUEL D'INSTRUCTIONS TV A SCHERMO LCD TV A SCHERMO LCD ISTRUZIONI TV CON PANTALLA LCD TV CON PANTALLA LCD MANUAL DE INSTRUCCIONES MANUAL DE INSTRUCCIONES 50083724 ©200 VICTOR COMPANY OF JAPAN, LIMITED...
  • Page 20 Contents For your safety Some “DOs” and “DON’Ts” for you...
  • Page 21 DON’T DON’T DON’T DON’T DON’T ** Cold cathode fluoresant lamp in LCD PANEL contains a small amount of mercury, please DON’T follow local ordinates or regulations for dis- posal. DON’T DON’T DON’T...
  • Page 22 WARNING • Fingers may be trapped under the TV causing injuries. Hold the TV at the bottom in the middle, and do not allow it to tilt up or down. • The TV may fall causing injuries. Hold the bottom of the stand with your hand and tilt the TV up and down.
  • Page 23 Important Information Please take note EXCLUSION CLAUSE WARNING! NEVER LEAVE A Care and disposal STATIONARY IMAGE ON THE SCREEN...
  • Page 24 Remote Control Buttons...
  • Page 25 Control Panel Buttons...
  • Page 26 Using the stand...
  • Page 27 Remove the terminal Cover...
  • Page 28 Where to install...
  • Page 29 Preparation Before Switching on your TV Power connection Features Connections to the RF input socket 867G@ÃUWÃ UWÃS@6SÃQ6I@G...
  • Page 30 How to connect other devices Switching the TV ON/OFF To switch the TV on Inserting batteries in the remote control handset To switch the TV off NOTE: Remove the batteries from remote con- trol handset when it is not to be used for a long period.
  • Page 31 Initial Settings Operating the TV First A.P.S. (Automatic You can operate your TV using both the re- mote control handset and onset buttons. Programming System) Operating with the buttons on the 6ÃQà Tà 8 ‚ˆ ‡ …’ 6à QÃTà Gh tˆh tr @t yv †u q‚...
  • Page 32 Menu System 92/80( Picture Menu Hint: The channel list numbers are assigned by the broad- casters. Because not all channels are broadcast free-to-air and stored by the receiver, the channel list numbers do not run continuously. The fifteenth channel in the list, for ex- ample, may not be channel number 15 but channel number Q vp ‡ˆ…...
  • Page 33 Qvp‡ˆ…r H ‚qr H hˆhy 8‚‡…h †‡ 7… vtu‡ Tuh …ƒr†† " Qv p ‡ ˆ … r 8‚y‚ˆ … "! 8‚y‚ˆ …ÃUr€ ƒr…h‡ˆ …r I ‚…€hy H ‚ q r H h ˆ h y 7… vtu‡! H v 8 ‚...
  • Page 34 Feature Menu Ar h ‡ˆ… r T y r rƒÃUv €r… P ss 8 uvy qÃG‚p x ssÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃP  @ t y v† u Gh tˆh tr ssÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃP  7 yˆrÃ7 hp x q‚ Ãs ‚…Ãsr h‡ˆ… rÆr ‡‡v t†...
  • Page 35 Installation Menu D † ‡hyyh ‡v‚ Q …‚t …h €€vt Q …‚t …h €ÃUh iyr 6 QT  q ‚ Ãs‚…Ãv †‡hy yh‡v‚Ã†r ‡‡vt† Programming Menu Q…‚t…h€€vt Q…‚t…h€ÃIˆ€ir… Ã! aÃ9ÃA Q…‚t…h€ÃIh€r 7hq 8uhry Ã% à 8‚y‚ˆ…ÃT’†‡r€ 6VUP T‚ˆqÃT’†‡r€ AvrÃUˆvt HhˆhyÃTrh…pu !%%!$ÃÃHC“...
  • Page 36 A.P.S. (Auto Programming System) 6ÃQà Tà 8 ‚ˆ ‡ …’ 6à QÃTà Program Table q‚ Ãs ‚…Ã6à QÃTà Q…‚t…h€ÃUhiy r Ãà D UW " ÃÃÃà ÃÃÃà ÃÃ! a9 A ÃÃÃà ÃÃÃà ÃÃ" ÃÃÃà ! & ÃÃÃà 7 78 8ÃÃ$ ÃÃÃà ÃÃÃà ÃÃ# 8ÃÃ%...
  • Page 37 Source Menu Sound Indicator T ‚ˆ …p r @ Y U @ Y U 0RQR @ Y U S B 7 @ Y U! @ Y U!T 6WHUHR q‚ Ãs‚…Æ ‚ˆ… prÆr y rp ‡v ‚ 'XDO , 'XDO ,, Other Features TV Status Hyper Sound...
  • Page 38 PC Mode Installation Volume Bar $ÃQvÃHvvÃ9TˆiÃ8‚rp‡‚… 92/80( EXT Modes Menu System in PC mode PC Picture Menu Zoom Modes Q 8ÃQ vp‡ˆ… r 8‚‡ …h †‡ 7…v tu ‡ 8‚y ‚ˆ …ÃUr€ ƒr… h‡ˆ …r I‚… €h y S r† r‡ q‚Ãs‚...
  • Page 39 PC Picture Position Menu Q 8ÃQ v p‡ˆ… rÃQ ‚† v‡v ‚ 6 ˆ‡‚Ã6q wˆ† ‡€r‡ C ÃQ ‚†v‡ v‚  WÃQ‚ †v‡ v‚  9 ‚‡Ã8y ‚px Q uh †r &! q‚ Ãs‚…ÃQ 8Ãvp‡ ˆ …rà ‚ †v ‡v ‚ Sound Menu Source Menu T ‚ˆ...
  • Page 40 Teletext To Select Double Height Text To operate Teletext To Reveal “concealed” Information To Stop Automatic Page Change To select a page of Teletext To Select a Subcode Page To Select Index Page Searching for a teletext page while watching TV...
  • Page 41 Peripheral Equipment Connections To exit Teletext Fastext and Toptext Via the Euroconnector RGB mode Via the RCA jacks Via the ANT (aerial) socket Decoder...
  • Page 42 Connecting Headphones Connecting the PC TV and Video Recorder (VCR) To connect to S-Video input NTSC Playback Camera and Camcorder Connect the decoder to the video recorder...
  • Page 43 Peripheral Equipment Connections...
  • Page 44 Antenna Connections Peripheral Equipment Connections 6V9DPÃÃDI WD9@PÃDI $17 ,1 &$0&25'(5...
  • Page 45 PC Input Typical Display Modes 5HVROXWLRQ )UHTXHQF\ 0RGH +RUL]RQWDO 9HUWLFDO +RU N+] 9HU +]     ...
  • Page 46 PC Picture Tips Can not turn the TV on? Sound Can not turn the TV off? Care of the Screen Remote Control Colours of image on screen are abnormal No solution No Image on Display Screen...
  • Page 47 Specifications Model Item LT-20J50SU Broadcasting Systems PAL SECAM BG, DK, I, L, Lp Channels and VHF (VL) : 46,25 MHz - 168,25 MHz Frequencies VHF (VH) : 175,25 MHz - 463,25 MHz UHF : 471,25 MHz - 863,25 MHz Cable TV : (S1-S20/ S21-S41) Input Signal Video: Analog 0,7 Vp-p 75 ohm positive Sync: TTL Level positive or negative, Seperate sync.
  • Page 48 SCHEMATIC DIAGRAMS WIDE LCD PANEL TELEVISION YA413 2006 LT-20J50SJ, LT-20J50SU CD-ROM No.SML200605 No.YA413 COPYRIGHT © 2006 Victor Company of Japan, Limited 2006/5...
  • Page 49 LT-20J50SJ LT-20J50SU STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY Type The components identified by the symbol and shading are No indication : Ceramic capacitor critical for safety. For continued safety replace safety ciritical : Metalized mylar capacitor : Polypropylene capacitor components only with manufactures recommended parts.
  • Page 50 MAIN PWB PATTERN ..........................2-19 SIDE CONTROL PWB PATTERN ......................2-23 LED PWB PATTERN ..........................2-23 AV JACK PWB PATTERN ........................2-24 USING P.W. BOARD P.W.B ASS’Y name LT-20J50SJ LT-20J50SU MAIN P.W. BOARD VE-20255339 AV JACK P.W. BOARD VE-20239086 SIDE CONTROL P.W. BOARD VE-20235650 LED P.W.

  • Page 51: Block Diagram

    BLOCK DIAGRAM TV system block diagram RF in VFIN (24,25) UOCIII Y4(51) S-Video in C4(52) CVBS in CVBS3/Y3(58) AUDIOIN5L(34) MUX block diagram AUDIOIN5R(35) C2(59) Scart PC Audio in CVBS2/Y2(55) IFVO(43) AUDIO UTS L(36) PCAUDIOINL(49) AUDIOUTSR(37 PCAUDIOINR(50) AUDIOIN3L(56) MUX BLOCK AUDIOIN3R(57) Audio in 74HC14 VDRA,HOUT(23,67)

  • Page 52: Wiring Diagram

    WIRING DIAGRAM LCD PANEL UNIT INVERTER UNIT PL201 PL175 PL180 PL176 MAIN PWB PL403 PL101 PL100 PL402 SIDE PL406 PL405 PL407 CONTROL AV JACK LED PWB SPEAKER SPEAKER (No.YA413)2-5 2-6(No.YA413)

  • Page 53: Circuit Diagrams

    CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/5) MAIN PWB ASS'Y (1/5) VE-20255339 NOTE : Refer to the part list for the part number of IC101 and IC102. c17MB18-5-01_0302_1/5_0.0 (No.YA413)2-7 2-8(No.YA413)
  • Page 54 MAIN PWB CIRCUIT DIAGRAM (2/5) MAIN PWB ASS'Y (2/5) VE-20255339 (No.YA413)2-9 2-10(No.YA413)
  • Page 55 MAIN PWB CIRCUIT DIAGRAM (3/5) MAIN PWB ASS'Y (3/5) VE-20255339 (No.YA413)2-11 2-12(No.YA413)
  • Page 56 MAIN PWB CIRCUIT DIAGRAM (4/5) MAIN PWB ASS'Y (4/5) VE-20255339 (No.YA413)2-13 2-14(No.YA413)
  • Page 57 MAIN PWB CIRCUIT DIAGRAM (5/5) MAIN PWB ASS'Y (5/5) VE-20255339 (No.YA413)2-15 2-16(No.YA413)

  • Page 58: Side Control Pwb Circuit Diagram

    SIDE CONTROL PWB CIRCUIT DIAGRAM AV JACK PWB CIRCUIT DIAGRAM SIDE CONTROL P.W.B ASS'Y VE-20235650 AV JACK P.W.B ASS'Y VE-20239086 c17TK71_0302_1/1_0.0 c17BAV01-2_0302_1/1_0.0 LED PWB CIRCUIT DIAGRAM LED P.W.B ASS'Y VE-20247127 c17LD41_0302_1/1_0.0 (No.YA413)2-17 2-18(No.YA413)

  • Page 59: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN [SOLDER SIDE] (No.YA413)2-19 2-20(No.YA413)
  • Page 60 MAIN PWB PATTERN [PARTS SIDE] (No.YA413)2-21 2-22(No.YA413)

  • Page 61: Side Control Pwb Pattern

    SIDE CONTROL PWB PATTERN LED PWB PATTERN (No.YA413)2-23...

  • Page 62: Av Jack Pwb Pattern

    AV JACK PWB PATTERN 2-24(No.YA413)
  • Page 63 Victor Company of Japan, Limited Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA413) Printed in Japan...
  • Page 64 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 65 SIDE CONTROL P.W. BOARD ASS'Y (VE-20235650) ..................3-9 LED P.W. BOARD ASS'Y (VE-20247127) ....................... 3-10 PACKING ................................... 3-11 PACKING PARTS LIST ............................. 3-12 USING P.W. BOARD & REMOTE CONTROL UNIT P.W.B ASS'Y No. P.W.B ASS'Y name LT-20J50SJ LT-20J50SU ← MAIN P.W.B VE-20255339 ← AV JACK P.W.B VE-20239086 ←...

  • Page 66: Exploded View-1,2 Parts List

    EXPLODED VIEW-1,2 PARTS LIST  Ref.No. Part No. Part Name Description Local VE-20242970 FRONT COVER  VE-20181267 LOGO JVC  VE-20233912 LENS  VE-30034322 SPEAKER 16ohm 5W 3x10cm(x2) VE-30036578 LCD PANEL UNIT  VE-20224812 FUNCTION BUTTON  VE-35012930 METAL HANG...

  • Page 67: Exploded View-1

    EXPLODED VIEW-1 3-4(No.YA413)

  • Page 68: Exploded View-2

    EXPLODED VIEW-2 LCD PANEL UNIT INVERTER UNIT PL201 PL175 PL180 PL176 MAIN PWB PL403 PL100 PL101 PL402 SIDE PL406 PL405 PL407 CONTROL AV JACK LED PWB SPEAKER SPEAKER (No.YA413)3-5...

  • Page 69: Printed Wiring Board Parts List

    PRINTED WIRING BOARD PARTS LIST MAIN P.W. BOARD ASS'Y (VE-20255339) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C108 VE-30012582 CAPACITOR 10nF 50V K C109 VE-30012582 CAPACITOR 10nF 50V K IC100 VE-30027986 C110 VE-30016654 CAPACITOR...
  • Page 70 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C268 VE-30000352 E CAPACITOR 100uF 16V M C407 VE-30012581 CAPACITOR 1nF 50V K C271 VE-30016654 CAPACITOR 100nF 16V K C410 VE-30012559 CAPACITOR 10pF 50V D C273 VE-30016654 CAPACITOR...
  • Page 71 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C535 VE-30016085 E CAPACITOR 10uF 63V R237 VE-30012510 RESISTOR 1/16W 100R J C536 VE-30016654 CAPACITOR 100nF 16V K R238 VE-30012510 RESISTOR 1/16W 100R J C537 VE-30016654 CAPACITOR...

  • Page 72: Av Jack P.w. Board Ass'y (Ve-20239086)

    Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R449 VE-30012641 RESISTOR 1/16W 10K J L504 VE-30020531 FERRITE R450 VE-30012692 RESISTOR 1/16W 4.7K J L505 VE-30006712 FERRITE BEAD R451 VE-30012641 RESISTOR 1/16W 10K J L506 VE-30019475 FIXED COIL...

  • Page 73: Led P.w. Board Ass'y (Ve-20247127)

    LED P.W. BOARD ASS'Y (VE-20247127) Ref No. Part No. Part Name Description Local VE-30031033 PREAMPLIFIER VE-30040560 RED/GREEN VE-30000371 E CAPACITOR 22uF 50V M VE-30000459 RESISTOR 1/4W 100R J 3-10(No.YA413)

  • Page 74: Packing

    PACKING (No.YA413)3-11...

  • Page 75: Packing Parts List

    PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local VE-50084611 CARTON BOX LT-20J50SJ VE-50083541 CARTON BOX LT-20J50SU VE-20235217 CUSHION ASSEMBLY 2pcs in 1set VE-30039453 REMOTE CONTROL UNIT RM-C1861 VE-50084612 INST BOOK (ENGLISH) LT-20J50SJ  VE-50083724 INST BOOK (ENGLISH/GERMANY/FRENCH/ITALIAN/SPANISH LT-20J50SU ...

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