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SERVICE MANUAL
10
SERVICE MANUAL
YA655<Rev.001>
2008
LT-26KM18
COPYRIGHT © 2008 Victor Company of Japan, Limited
No.YA587: LT-32EX18 SERIES
No.YA644: LT-32FX38 SERIES
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
LCD COLOUR TELEVISION
/NSK
<FU2 CHASSIS LINEUP>
No.YA645: LT-32BX18 SERIES
No.YA645: LT-32BX38 SERIES
TABLE OF CONTENTS
COPYRIGHT © 2008 Victor Company of Japan, Limited
, LT-26KM28
No.YA649: LT-32BX38 SERIES
No.YA588: LT-42EX18 SERIES
/NSK
BASIC CHASSIS
FU2
No.YA655<Rev.001>
2008/10
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Summary of Contents for JVC LT-26KM18/NSK
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Page 1: Table Of Contents
SERVICE MANUAL LCD COLOUR TELEVISION YA655<Rev.001> 2008 SERVICE MANUAL LT-26KM18 , LT-26KM28 /NSK /NSK BASIC CHASSIS COPYRIGHT © 2008 Victor Company of Japan, Limited <FU2 CHASSIS LINEUP> No.YA587: LT-32EX18 SERIES No.YA645: LT-32BX18 SERIES No.YA649: LT-32BX38 SERIES No.YA644: LT-32FX38 SERIES No.YA645: LT-32BX38 SERIES No.YA588: LT-42EX18 SERIES TABLE OF CONTENTS PRECAUTION. - Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 67.2 cm × 51.9 cm × 23.0 cm [with stand] 67.2 cm × 47.1 cm × 10.8 cm [without stand] Mass 10.0 kg [with stand] 9.0 kg [without stand] Power Input AC220V - AC240 V, 50 Hz / 60 Hz Power Consumption...
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Page 3: 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 4 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 5 1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL) 1.3.4 HOW TO CHECK THE OPERATING TIME (1) Avoid placing the unit under direct sunlight over a This model has a function to count and record the LCD panel prolonged period of time. This may cause the optical filter operating time.
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Page 6: Specific Service Instructions
This function ensures dull colours are compensated to PULL DOWN produce natural hues. This function displays a cinema film picture more smoothly and naturally on the screen. MAIN DIFFERENCE LIST Item LT-26KM18/NSK LT-26KM28/NSK Cabinet Colour Black & Black Silver & Black 1-6 (No.YA655<Rev.001>) - Page 7 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 8 2.3.2 MAIN CPU PIN FUNCTION [IC7001 : DIGITAL PWB] Pin Pin name I/O Function Pin Pin name I/O Function MCLK Not used DGND SDITDO Data for SDI Not used SDITDI Data for SDI Not used SDITCK Clock for SDI VDD33 3.3V power supply SDITRST Reset for SDI...
- Page 9 Pin Pin name I/O Function Pin Pin name I/O Function 111 SDVDD 3.3V power supply 167 SCL0 Clock for I C bus (for E2PROM) 112 XOUT 27MHz oscillation for CPU system clock 168 VCCQ33 3.3V power supply 113 XIN 27MHz oscillation for CPU system clock 169 AUDIO_MUTE Speaker/monitor output muting [Muting = H] 114 RESET...
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Page 10: Disassembly
SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE • Make sure that the power cord is disconnected from the outlet. • Pay special attention not to break or damage the parts. • Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors. •... - Page 11 POWER CORD STAND BASE COVER REAR COVER POWER CORD COVER DIGITAL PWB ANALOG POWER PWB STAND MAIN BASE TERMINAL BASE LCD CONTOROL PWB COVER INVERTER BOTTOM FRAME PWB COVER TOP FRAME CHOKE COIL IR+LED PWB LCD PANEL UNIT INVERTER PWB SPEAKER SW PWB SPEAKER...
- 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 TABLE Symbol Number of pins Mounting PWB Main content of data...
- Page 13 3.2.3 SETTINGS OF FACTORY SHIPMENT (2) SOUND 3.2.3.1 BUTTON OPERATION Setting item Setting position Setting item Setting position STEREO / I•II Stereo sound POWER Bass Centre CHANNEL Treble Centre VOLUME Balance Centre TV/AV Cinema Surround 3.2.3.2 REMOTE CONTROL DIRECT OPERATION (3) FEATURES Setting item Setting position...
- 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 (1) This TV is adjusted by using REMOTE CONTROL UNIT. (2) The adjustment using the REMOTE CONTROL UNIT is made on the basic of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values. (3) Make sure that connection is correctly made AC to AC power source. - Page 16 4.4.5 ADJUSTMENT MODE PCVGA : PC VGA/60 This mode is used to adjust the VIDEO CIRCUIT. PCXGA : PC XGA/60 4.4.5.1 HOW TO ENTER THE ADJUSTMENT MODE PCSXGA : SXGA/60 When the SERVICE MENU SCREEN of SERVICE MODE is PCSVGA : PC SVGA/60 displayed, press [1] key to enter the ADJUSTMENT MODE.
- 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.
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Page 18: Troubleshooting
SECTION 5 TROUBLESHOOTING SELF CHECK FEATURE 5.1.1 OUTLINE SERVICE MODE SCREEN This unit comes with the "Self check" feature, which checks the operational state of the circuit and displays/saves it during failure.Diagnosis is performed when power is turned on, and information input to the main microcomputer is monitored at all S ERV ICE ME NU V er .xxx... - Page 19 5.1.6 DETAILS Self check is performed for the following items: Diagnosis Detection item Display Detection content Detection timing signal (line) Low bias line short Confirm the operation of the low bais(5V/12V/14V/16V/ PROTECTOR Detection starts 3 seconds after protection 24V) protection circuit. the power is turned on.
- Page 20 Victor Company of Japan, Limited Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA655<Rev.001>) Printed in Japan...