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JVC LT-26A60BU Service Manual

Wide lcd panel television
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SERVICE MANUAL
WIDE LCD PANEL TELEVISION
10
2005
YA314
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
LT-26A60BU,
LT-26A60SJ,
LT-26A60SU

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
BASIC CHASSIS
FT
No.YA314
2005/10

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Summary of Contents for JVC LT-26A60BU

  • Page 1: Table Of Contents

    SERVICE MANUAL WIDE LCD PANEL TELEVISION YA314 2005 LT-26A60BU, LT-26A60SJ, LT-26A60SU BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 68.6 cm × 52.5 cm × 22.5 cm [Included stand] 68.6 cm × 47.4 cm × 12.2 cm [TV only] Mass 15.6 kg [Included stand] 12.4 kg [TV only] Power Input AC110V - AC240 V, 50 Hz / 60 Hz Power Consumption...

  • 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 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 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

    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. MAIN DIFFERENCE LIST Item LT-26A60BU LT-26A60SU LT-26A60SJ FRONT PANEL COLOUR BLACK SILVER...
  • 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 2.4.2 MAIN CPU PIN FUNCTION [U302 : MAIN PWB] Pin Pin name I/O Function Pin Pin name I/O Function I/O Program ROM data for CPU - Not used I/O Program ROM data for CPU XTAL2 O 6MHz for system clock I/O Program ROM data for CPU XTAL1 I 6MHz for system clock...

  • Page 10: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE CAUTION AT DISASSEMBLY: • 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 STAND COVER CABLE COVER JACK COVER BACK BRACKET STAND MAIN PWB SHIELD REAR COVER POWER PWB SHIELD MAIN PWB POWER PWB POWER CORD TERMINAL BASE MAIN BASE INSULATOR TOP FRAME SPEAKER SPEAKER LCD PANEL UNIT LED PWB BOTTOM FRAME KEY PWB FRONT PANEL KNOB BASE CONTROL KNOB...
  • 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 MEMORY IC REPLACEMENT PROCEDURE 1.
  • Page 13 3.2.3 SETTINGS OF FACTORY SHIPMENT 3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION Setting item Setting position Setting item Setting position POWER CHANNEL CHANNEL VOLUME VOLUME ZOOM PANORAMIC TV/AV 3D SOUND 3.2.3.3 REMOTE CONTROL MENU OPERATION (1) PICTURE (4) FEATURES Setting item Setting position Setting item...
  • 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 ADJUSTMENT PREPARATION ADJUSTMENT ITEMS (1) The adjustment using the REMOTE CONTROL UNIT is VIDEO CIRCUIT made on the basis of the initial setting values. The • WHITE BALANCE (HIGH LIGHT) adjustment setting values which adjust the screen to the optimum condition can be different from the initial setting BASIC OPERATION OF SERVICE MODE values.
  • Page 16 4.5.3 DESCRIPTION OF STATUS DISPLAY (5) SETTING ITEM NAME Setting item name are displayed. The setting item numbers to SETTINGITEM No. SETTING ITEM SETTING VALUE (DATA) be displayed are listed below. Item No. Setting item S001 - S043 Video system setting -1 S001 5I R OF S001 5I R OF PAL50...
  • Page 17 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 18 Item No. Item name Variable range Setting value D028 PC S BRI 000 - 063 D029 TXT S CON 000 - 127 D030 TXT S BRI 000 - 127 D031 RGB S CON 000 - 127 D032 RGB S BRI 000 - 127 D033 STD BRI1...

  • Page 19: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.YA314)1-19...
  • Page 20 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.YA314) Printed in Japan...

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