JVC InteriArt LT-20A55SJ Service Manual
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JVC InteriArt LT-20A55SJ Service Manual

Wide lcd panel television
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SERVICE MANUAL
WIDE LCD PANEL TELEVISION
3
2006
YA381
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
LT-20A55SJ,
LT-20A55SU

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COPYRIGHT © 2006 Victor Company of Japan, Limited
No.YA381
2006/3

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  • Page 1: Table Of Contents

    SERVICE MANUAL WIDE LCD PANEL TELEVISION YA381 2006 LT-20A55SJ, LT-20A55SU TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 53.7cm × 41.4cm × 21.4cm [Included stand] 53.7cm × 37.7cm × 9.7cm [TV only] Mass 6.5kg [Included stand] 5.5kg [TV only] Power Input ADAPTOR AC100 - 240V 50Hz DC24V Power Consumption 80W (Standby: 3.0W) 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 SIDE AV DOOR BACK COVER FUNCTION BUTTON SIDE CONTROL PWB AV JACK METAL HANG BRACKET REGULATOR PWB AV JACK PWB BACK DOOR MAIN PWB TERMINAL BRACKET CABLE HOLDER LED PWB LCD PANEL UNIT HINGE COVER DISPLAY SUPPORT FOOT TOP COVER SPEAKER LED LENS FOOT ASSEMBLY...
  • 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 00.75 053 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_WXGA 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.YA381)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.YA381) Printed in Japan...
  • Page 19 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 20 CONTENTS USING P.W. BOARD & REMOTE CONTROL UNIT ....................3-2 EXPLODED VIEW-1,2 PARTS LIST ........................... 3-3 EXPLODED VIEW-1 ..............................3-4 EXPLODED VIEW-2 ..............................3-5 PRINTED WIRING BOARD PARTS LIST ........................3-6 MAIN P.W. BOARD ASS'Y (VE-20237199) ....................... 3-6 AV JACK P.W. BOARD ASS'Y (VE-20236020) ....................3-9 SIDE CONTROL P.W.

  • Page 21: Exploded View-1,2 Parts List

    EXPLODED VIEW-1,2 PARTS LIST  Ref.No. Part No. Part Name Description Local VE-20224798 FRONT COVER  VE-20181267 LOGO JVC  VE-20233912 LENS  VE-30034322 SPEAKER (x2) VE-30041596 LCD PANEL UNIT  VE-20235932 AV JACK BRACKET  VE-20224812 FUNCTION BUTTON ...

  • Page 22: Exploded View-1

    EXPLODED VIEW-1 3-4(No.YA381)

  • Page 23: Exploded View-2

    EXPLODED VIEW-2 REGULATOR PL103 PL102 PL101 INVERTER UNIT LCD PANEL UNIT PL501 PL175 PL201 PL179 PL176 PL101 MAIN PWB PL403 PL402 PL500 PL104 PL406 PL405 SIDE PL407 AV JACK CONTROL Q505 C SPEAKER SPEAKER LED PWB (No.YA381)3-5...

  • Page 24: Printed Wiring Board Parts List

    PRINTED WIRING BOARD PARTS LIST MAIN P.W. BOARD ASS'Y (VE-20237199) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C109 VE-30012582 CAPACITOR 10nF 50V K C110 VE-30016654 CAPACITOR 100nF 16V K IC100 VE-30027986 C111 VE-30016654 CAPACITOR...
  • Page 25 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C258 VE-30012568 CAPACITOR 270pF 50V J C366 VE-30012573 CAPACITOR 47pF 50V J C259 VE-30016654 CAPACITOR 100nF 16V K C367 VE-30012573 CAPACITOR 47pF 50V J C260 VE-30016654 CAPACITOR...
  • Page 26 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C523 VE-30000352 E CAPACITOR 100uF 16V M R226 VE-30012692 RESISTOR 1/16W 4.7K J C524 VE-30000352 E CAPACITOR 100uF 16V M R227 VE-30012510 RESISTOR 1/16W 100R J C525 VE-30000352 E CAPACITOR...

  • Page 27: Av Jack P.w. Board Ass'y (Ve-20236020)

    Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R438 VE-30012707 RESISTOR 1/16W 680R J L221 VE-30029701 FIXED COIL R439 VE-30012510 RESISTOR 1/16W 100R J L411 VE-30001971 FERRITE R440 VE-30012648 RESISTOR 1/16W 150K J L412 VE-30001971 FERRITE...

  • Page 28: Side Control P.w. Board Ass'y (Ve-20235650)

    SIDE CONTROL P.W. BOARD ASS'Y (VE-20235650) Ref No. Part No. Part Name Description Local VE-30032684 TACT SWITCH VOLUME + VE-30032684 TACT SWITCH VOLUME - VE-30032684 TACT SWITCH PROGRAM + VE-30032684 TACT SWITCH PROGRAM - VE-30032684 TACT SWITCH MENU VE-30032684 TACT SWITCH TV/AV/OK VE-30032684 TACT SWITCH...

  • Page 29: Packing

    PACKING (No.YA381)3-11...

  • Page 30: Packing Parts List

    PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local VE-50082828 CARTON BOX LT-20A55SJ VE-50083309 CARTON BOX LT-20A55SU VE-20217803 CUSHION ASSEMBLY VE-30039453 REMOTE CONTROL UNIT RM-C1861 VE-50082829 INST BOOK ENGLISH LT-20A55SJ  VE-50082875 INST BOOK ENGLISH/GERMANY/FRENCH/ITALIAN LT-20A55SU  VE-50082876 INST BOOK SWEDISH/DANISH/NORWEGIAN/FINNISH LT-20A55SU...
  • Page 31 SCHEMATIC DIAGRAMS WIDE LCD PANEL TELEVISION YA381 2006 LT-20A55SJ, LT-20A55SU CD-ROM No.SML200603 No.YA381 COPYRIGHT © 2006 Victor Company of Japan, Limited 2006/3...
  • Page 32 LT-20A55SJ LT-20A55SU 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 33 CONTENTS SEMICONDUCTOR SHAPES ..............2-2 BLOCK DIAGRAM ..................2-3 WIRING DIAGRAM ..................2-5 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM ........................ 2-7 SIDE CONTROL PWB CIRCUIT DIAGRAM ..................... 2-17 LED PWB CIRCUIT DIAGRAM ......................... 2-17 AV JACK PWB CIRCUIT DIAGRAM ......................2-18 REGULATOR PWB CIRCUIT DIAGRAM ....................2-18 PATTERN DIAGRAMS MAIN PWB PATTERN ..........................

  • Page 34: 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 35: Wiring Diagram

    WIRING DIAGRAM REGULATOR PL103 PL102 PL101 INVERTER UNIT LCD PANEL UNIT PL501 PL175 PL201 PL179 PL176 PL101 MAIN PWB PL403 PL402 PL500 PL104 PL406 PL405 SIDE PL407 AV JACK CONTROL Q505 C SPEAKER SPEAKER LED PWB (No.YA381)2-5 2-6(No.YA381)

  • Page 36: Circuit Diagrams

    CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/5) MAIN PWB ASS'Y (1/5) VE-20237199 NOTE : Refer to the part list for the part number of IC101 and IC102. c17MB18-5-01_0302_1/5_0.0 (No.YA381)2-7 2-8(No.YA381)
  • Page 37 MAIN PWB CIRCUIT DIAGRAM (2/5) MAIN PWB ASS'Y (2/5) VE-20237199 (No.YA381)2-9 2-10(No.YA381)
  • Page 38 MAIN PWB CIRCUIT DIAGRAM (3/5) MAIN PWB ASS'Y (3/5) VE-20237199 (No.YA381)2-11 2-12(No.YA381)
  • Page 39 MAIN PWB CIRCUIT DIAGRAM (4/5) MAIN PWB ASS'Y (4/5) VE-20237199 (No.YA381)2-13 2-14(No.YA381)
  • Page 40 MAIN PWB CIRCUIT DIAGRAM (5/5) MAIN PWB ASS'Y (5/5) VE-20237199 (No.YA381)2-15 2-16(No.YA381)

  • Page 41: 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-20236020 c17TK71_0302_1/1_0.0 c17FAV17-2_0302_1/1_0.0 LED PWB CIRCUIT DIAGRAM REGULATOR PWB CIRCUIT DIAGRAM LED P.W.B ASS'Y REGULATOR P.W.B ASS'Y VE-20247679 VE-20223829 c17LD34-4_0302_1/1_0.0 c17PWI16_0302_1/1_0.0 (No.YA381)2-17 2-18(No.YA381)

  • Page 42: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN [SOLDER SIDE] (No.YA381)2-19 2-20(No.YA381)
  • Page 43 MAIN PWB PATTERN [PARTS SIDE] (No.YA381)2-21 2-22(No.YA381)

  • Page 44: Side Control Pwb Pattern

    SIDE CONTROL PWB PATTERN LED PWB PATTERN (No.YA381)2-23...

  • Page 45: Av Jack Pwb Pattern

    AV JACK PWB PATTERN REGULATOR PWB PATTERN [SOLDER SIDE] REGULATOR PWB PATTERN [PARTS SIDE] 2-24(No.YA381)
  • Page 46 Victor Company of Japan, Limited Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA381) Printed in Japan...

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