Download
Share
Print this page
JVC LT-40X776/S Service Manual
  1. Manuals
  2. Brands
  3. JVC Manuals
  4. LCD TV
  5. LT-40X776/S
  6. Service manual

JVC LT-40X776/S Service Manual

Lcd flat television
Hide thumbs Also See for LT-40X776/S:

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
7
2006
YA301C
LT-40X776/SP is the model whose production place of P.W.B. ASS'Y was changed based on LT-40X776/S.
Therefore, this service manual describes only the items which differ from those of the LT-40X776/S service
manual.
For details other than those described in this manual, please refer to the LT-40X776/S service manuals
(No.YA301, 2005/8) (No.YA301B, 2006/2).
HOW TO IDENTIFY MODELS
Distinguish name is added to the model name after at the Rating label.
LCD FLAT TELEVISION
LT-40X776
Supplementary
MODEL NO.
COPYRIGHT © 2006 Victor Company of Japan, Limited
/SP
DISTINGUISH NAME
MODEL NAME
LT-40X776
VIDEO EQUIPMENT
4C43
BASIC CHASSIS
FL2
SPA
No.YA301C
2006/7

Advertisement

loading

Related Manuals for JVC LT-40X776/S

Summary of Contents for JVC LT-40X776/S

  • Page 1 Supplementary LT-40X776/SP is the model whose production place of P.W.B. ASS'Y was changed based on LT-40X776/S. Therefore, this service manual describes only the items which differ from those of the LT-40X776/S service manual. For details other than those described in this manual, please refer to the LT-40X776/S service manuals (No.YA301, 2005/8) (No.YA301B, 2006/2).
  • Page 2 DIFFERENCE LIST USING P.W. BOARD (Page 3-2) P.W.B ASS'Y Name LT-40X776/S LT-40X776/SP DESCRIPTION DIGITAL SIGNAL PWB SFL0D134A-M2 SFL0D134A-SS Change only in PWB ASS'Y No. EXPLODED VIEW PARTS LIST-1 (Page 3-3) Part No. Ref. No. PART NAME DESCRIPTION LT-40X776/S LT-40X776/SP SFL0D134A-M2...
  • Page 3 SECTION 1 PRECAUTION Please refer to "LT-40X776/S (No.YA301)" about this section. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS Please refer to "LT-40X776/S (No.YA301)" about this section. SECTION 3 DISASSEMBLY Please refer to "LT-40X776/S (No.YA301)" about this section. SECTION 4 ADJUSTMENT Please refer to "LT-40X776/S (No.YA301)" about this section.
  • Page 4 Victor Company of Japan, Limited Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA301C) Printed in Japan...
  • Page 5 YA301B 2006 LT-40X776 BASIC CHASSIS Supplementary Please be informed that there are errors in the following service manuals. LT-40X776/S (No.YA301 2005/8) CORRECTION ITEM PRINTED WIRING BOARD PARTS LIST CARD P.W. BOARD ASS'Y (Page 3-12) PART No. Ref. No. PART NAME...
  • Page 6 SECTION 1 PRECAUTION Please refer to "LT-40X776/S (No.YA301)" about this section. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS Please refer to "LT-40X776/S (No.YA301)" about this section. SECTION 3 DISASSEMBLY Please refer to "LT-40X776/S (No.YA301)" about this section. SECTION 4 ADJUSTMENT Please refer to "LT-40X776/S (No.YA301)" about this section.

  • Page 7: Table Of Contents

    SERVICE MANUAL LCD FLAT TELEVISION YA301 2005 LT-40X776 BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 8 SPECIFICATION Items Contents Dimensions ( W × H × D ) 100.0 cm × 73.4 cm × 32.5 cm (39-3/8" × 29" × 12-7/8") [Included stand] 70.3 cm × 48.3 cm × 11.5 cm (39-3/8" × 26-1/2" × 4-1/4") [TV only] Mass 31.5 kg (69.3 lbs) [Included stand] 24.8 kg (54.3 lbs) [TV only]...

  • Page 9: 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 10 INSTALLATION 1.2.1 HEAT DISSIPATION 1.2.3 INSTALLATION REQUIREMENTS If the heat dissipation vent behind this unit is blocked, cooling To ensure safety in an emergency such as an earthquake, and efficiency may deteriorate and temperature inside the unit will to prevent accidents, ensure that measures are taken to prevent rise.
  • Page 11 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 12: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS SYSTEM SETTEING Be sure to carry out the following operation at the end of MAIN MENU SCREEN the procedure. SERVICE MENU SERVICE MENU (1) Set to 0 minutes using the [SLEEP TIMER] key. 1.ADJUST 1.ADJUST 2.SELF_CHECK 2.SELF_CHECK (2) Press the [VIDEO STATUS] key and [DISPLAY] key...
  • Page 13 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 14 2.3.2 MAIN CPU PIN FUNCTION [IC7601 : DIGITAL SIGNAL PWB ASS'Y] Pin name Function Pin name Function VHOLD1 Data slice for main screen closed caption Not used HFLT1 I/O LPF for main screen closed caption video input Not used Not used Not used Not used Not used...
  • Page 15 2.3.3 SUB (CHASSIS) CPU PIN FUNCTION [IC7001 : DIGITAL SIGNAL PWB ASS'Y] Pin name Function Pin name Function LB_PRO Not used BS_TXD Not used : Data transmission for digital tuner communication P_MU Picture muting [Muting = H] BS_RXD Not used : Data receive for digital tuner communication JP_CSB Not used (NC) Not used (NC)

  • Page 16: Disassembly

    SECTION 3 DISASSEMBLY CAUTION AT DISASSEMBLY • Be sure to perform the SYSTEM SETTING at the end of the procedure. • Make sure that the power cord is disconnected from the outlet. • Pay special attention not to break or damage the parts. •...
  • Page 17 JACK COVER STAND COVER JACK COVER STAND TUNER BASE COOLING FAN TOP SHIELD CASE SIDE SHIELD CASE FAN BRACKET SHIELD REGULATOR PWB COVER REAR COVER MAIN POWER PWB RECEIVER PWB ATSC TUNER MODULE PWB POWER CORD POWER CORD HOLDER INSULATOR RECEIVER PWB DIGITAL BRACKET...
  • Page 18 3.2.14 REMOVING THE SPEAKER (Fig.2) • Remove the STAND. • Remove the REAR COVER. (1) Remove the 6 screws [A], then remove the SPEAKER (L /R). NOTE: • Since the speaker is attached in a certain direction, attach the speaker in the same correct direction as it has been attached.
  • Page 19 CARD PWB SHIELD CARD BASE MAIN BASE CARD PWB BOTTOM FRAME CARD PWB BRACKET SUB BRACKET TOP FRAME SPEAKER SUB BRACKET FRONT LED PWB SPEAKER FRONT PANEL FRONT Fig.2 (No.YA301)1-13...
  • Page 20 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. 3.3.1 MEMORY IC REPLACEMENT PROCEDURE 1.
  • Page 21 3.3.3 SETTINGS OF FACTORY SHIPMENT 3.3.3.1 BUTTON OPERATION 3.3.3.2 REMOTE CONTROL DIRECT OPERATION Setting item Setting position Setting item Setting position POWER INPUT CHANNEL CABLE-02 CHANNEL CABLE-02 VOLUME VOLUME MUTING DISPLAY ASPECT NTSC PANORAMA HD / ATSC FULL SLEEP TIMER THEATER PRO NATURAL CINEMA AUTO...
  • Page 22 REPLACEMENT OF CHIP COMPONENT 3.4.1 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. 3.4.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.

  • Page 23: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION BASIC OPERATION OF SERVICE MODE (1) There are 2 ways of adjusting this TV : One is with the 4.5.1 HOW TO ENTER THE SERVICE MODE REMOTE CONTROL UNIT and the other is the (1) Set to 0 minutes using the [SLEEP TIMER] key. conventional method using adjustment parts and (2) Press the [VIDEO STATUS] key and [DISPLAY] key components.
  • Page 24 4.5.4 ADJUSTMENT MODE This mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT. 4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODE When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE (Fig.2).
  • Page 25 INITIAL SETTING VALUES IN THE SERVICE MODE • Perform fine-tuning based on the "initial values" using the remote control when in the Service mode. • The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved may be different from the default values.
  • Page 26 Item No. Item name Variable range Setting value Item No. Item name Variable range Setting value D017 SV PfL 00 - 03 D063 (Not display) 00 - FF D018 SYL CON 00 - 3F D064 (Not display) 00 - FF D019 SYL CONF 00 - 01...
  • Page 27 Item No. Item name Variable range Setting value Item No. Item name Variable range Setting value D110 (Not display) 00 - FF D156 (Not display) 00 - FF D111 (Not display) 00 - FF D157 (Not display) 00 - FF D112 (Not display) 00 - FF...
  • Page 28 ADJUSTMENT PROCEDURE 4.7.1 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument 525i Remote [1.ADJUST] (1) Receive a 525i component ramp pattern A-D OFFSET control unit S001: PREPARE signal. (Adjustment setting mode change) (2) Set "VIDEO STATUS" to "STANDARD". Signal (3) Set "ASPECT"...
  • Page 29 Measuring Item Test point Adjustment part Description instrument SUB SCREEN Remote [1.ADJUST] (1) Set "VIDEO STATUS" to "STANDARD". A-D OFFSET control unit S001: PREPARE (2) Set "ASPECT" to "FULL". (Adjustment setting mode change) (3) Set "COLOR TEMPERATURE" to "LOW". Signal (4) Set "MULTI SCREEN"...
  • Page 30 4.7.2 MTS CIRCUIT Measuring Item Test point Adjustment part Description instrument MTS INPUT Remote [1.ADJUST] (1) Receive the any broadcast. LEVEL control unit T001: IN LEVEL (2) Select "1.ADJUST" from the SERVICE MODE. (3) Verify that the < T001 > (IN LEVEL) is set at its initial setting value.

  • Page 31: Troubleshooting

    SECTION 5 TROUBLESHOOTING SELF CHECK FEATURE 5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE 5.1.1 OUTLINE In addition to circuit failures (abnormal operation), the following This unit comes with the "Self check" feature, which checks the cases may also be iagnosed as "Abnormal" and displayed and operational state of the circuit and displays/saves it during counted as "NG".
  • Page 32 5.1.6 DETAILS Self check is performed for the following items: < Page 1 of screen > Diagnosis Detection item Display Detection content Detection timing signal (line) Low bias line short Confirm the operation of the low bais LB_PRO Detection starts 3 seconds after protection (5V / 9V) protection circuit.
  • Page 33 < Page 2 of screen > Diagnosis Detection item Display Detection content Detection timing signal (line) Fan lock Not used. Abnormal of operation of Not used. PANEL Abnormal rise Not used. oftemperature in PANEL Abnormal rise of Not used. temperature in AUDIO Short circuit detection of Not used.
  • Page 34 Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY DISPLAY CATEGORY 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA301) Printed in Japan...

This manual is also suitable for:

Lt-40x776/sp