JVC LT-26A61BJ Service Manual
Wide lcd panel television
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SERVICE MANUAL
WIDE LCD PANEL TELEVISION
12
YA369
2005
LT-26A61BJ, LT-26A61BU, LT-26A61BU
LT-26A61SJ, LT-26A61SU, LT-26A61SU
LT-32A61BJ, LT-32A61BU, LT-32A61BU
LT-32A61SJ, LT-32A61SU, LT-32A61SU
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
TABLE OF CONTENTS
COPYRIGHT © 2005 Victor Company of Japan, Limited
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BASIC CHASSIS
FT
No.YA369
2005/12
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Summary of Contents for JVC LT-26A61BJ
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Page 1: Table Of Contents
SERVICE MANUAL WIDE LCD PANEL TELEVISION YA369 2005 LT-26A61BJ, LT-26A61BU, LT-26A61BU LT-26A61SJ, LT-26A61SU, LT-26A61SU LT-32A61BJ, LT-32A61BU, LT-32A61BU LT-32A61SJ, LT-32A61SU, LT-32A61SU BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS . - Page 2 SPECIFICATION Contents LT-26A61BJ LT-32A61BJ Items LT-26A61BU LT-32A61BU LT-26A61SJ LT-32A61SJ LT-26A61SU LT-32A61SU Dimensions ( W × H × D ) 68.6 cm × 52.5 cm × 26.9 cm [Included stand] 82.0 cm × 60.2 cm × 26.9 cm [Included stand] 68.6 cm × 47.4 cm × 12.1 cm [TV only] 82.0 cm ×...
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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.
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Page 7: Specific Service Instructions
DIGITAL VNR PICTURE MODE This function cuts down the amount of noise in the original This function can adjust the picture settings automatically. picture. MAIN DIFFERENCE LIST Item LT-26A61BJ LT-26A61BU LT-26A61BU/C LT-26A61SJ LT-26A61SU LT-26A61SU/C PAINT COLOUR BLACK BLACK... - Page 8 HOW TO IDENTIFY MODELS BJ, BU, SJ and SU models : "AE" is added to the serial No. after at the Rating label. BU/C and SU/C models : "CE" is added to the serial No. after at the Rating label. MODEL No.
- Page 9 2.5.2 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...
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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 JACK COVER BACK BRACKET STAND MAIN PWB SHIELD REAR COVER MAIN PWB POWER PWB TERMINAL BASE POWER CORD INSULATOR MAIN BASE POWER PWB SHIELD TOP FRAME SPEAKER SPEAKER BOTTOM FRAME LCD PANEL UNIT LED PWB CONTROL PWB FRONT PANEL This exploded view shows the LT-32A61 series.
- 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.
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Page 15: Adjustment
SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION PRESET SETTING BEFORE ADJUSTMENTS (1) The adjustment using the REMOTE CONTROL UNIT is Unless otherwise specified in the adjustment items, preset the made on the basis of the initial setting values. The following functions with the REMOTE CONTROL UNIT. setting values which adjust the screen to the optimum Setting item Settings position... - Page 16 4.5.5 ADJUSTMENT MODE (4) WHITE BALANCE This mode is used to adjust the VIDEO CIRCUIT. State of the colour temperature is displayed. 4.5.5.1 HOW TO ENTER THE ADJUSTMENT MODE NOTE: When the SERVICE MENU SCREEN of SERVICE MODE is In ADJUSTMENT MODE, the colour temperature can be set displayed, press [1] key to enter the ADJUSTMENT MODE only to "NORMAL".
- 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 4.6.1.6 VIDEO SYSTEM SETTING -5 (Fixed values) Item No. Item name Variable range Setting value Item No. Item name Variable range Setting value D027 PC S CON 00 - 63 DD07 5I S CON 00 - 63 D028 PC S BRI 00 - 63 DD08 5I S BRI...
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Page 19: Troubleshooting
< S017 > (B DRIVE) to setting values of left table. Models Setting Value (7) Adjust to Keep one of < S030 > (Red drive), LT-26A61BJ < S031 > (Green drive) or < S032 > (Blue LT-26A61BU drive) unchanged, then lower the other two LT-26A61BU/C... - Page 20 Victor Company of Japan, Limited Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA369) Printed in Japan...