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SERVICE MANUAL

COPYRIGHT © 2008 Victor Company of Japan, Limited

No.YA655<Rev.001>

2008/10

LCD COLOUR TELEVISION

YA655<Rev.001>

2008

10

SERVICE MANUAL

LT-26KM18

/NSK

, LT-26KM28

/NSK

COPYRIGHT © 2008 Victor Company of Japan, Limited

<FU2 CHASSIS LINEUP>

TABLE OF CONTENTS

1

PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2

SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3

DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

4

ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

5

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

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

BASIC CHASSIS

FU2

1
2
3
...
»

Содержание LT-26KM18/NSK

Страница 1: ...SK COPYRIGHT 2008 Victor Company of Japan Limited FU2 CHASSIS LINEUP TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 6 3 DISASSEMBLY 1 10 4 ADJUSTMENT 1 15 5 TROUBLESHOOTING 1 18 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 BASIC CHASSIS FU2 ...

Страница 2: ...ls Horizontal 1366 pixels Vertical 768 pixels W XGA Audio Power Output 6 W 6 W Speaker 5 0 cm 12 0 cm oval type 2 Aerial terminal VHF UHF 75 Ω unbalanced coaxial Video Audio Input 1 2 Component Video 750p 1125i 625p 525p 625i 525i RCA pin jack 3 Y 1V p p Sync signal 0 35V p p 3 value sync 75 Ω Pb Pr 0 35V p p 75 Ω Y 1V p p Positive Negative sync provided 75 Ω Pb Pr 0 7V p p 75 Ω Video 1V p p Posit...

Страница 3: ...onents that indicate evidence of overheating should be replaced Always use the manufacturer s replacement components 6 Isolation Check Safety for Electrical Shock Hazard After re assembling the product always perform an isolation check on the exposed metal parts of the cabinet antenna terminals video audio input and output terminals Control knobs metal cabinet screw heads earphone jack control sha...

Страница 4: ...mages even when the unit is carefully packed To prevent accidents from occurring during transportation pay careful attention before delivery such as through explaining the handling instructions to transporters Ensure that the following requirements are met during transportation as the LCD panel of this unit is made of glass and therefore fragile 1 USE A SPECIAL PACKING CASE FOR THE LCD PANEL When ...

Страница 5: ... TIME This model has a function to count and record the LCD panel operating time The operating time can be checked in the following procedure Maximum count time 131072 hours 1 Press the RETURN key and MUTING key simultaneous ly then enter the SERVICE MODE 2 When the Main Menu is displayed press 2 key to enter the self check mode 3 The operating time of the LCD panel is displayed in 6 digit decimal...

Страница 6: ...is function ensures dull colours are compensated to produce natural hues AI VOLUME You can adjust the volume of all the channels and video inputs to the same level automatically depends on the strength of signal of the sources PULL DOWN This function displays a cinema film picture more smoothly and naturally on the screen 2 2 MAIN DIFFERENCE LIST Item LT 26KM18 NSK LT 26KM28 NSK Cabinet Colour Bla...

Страница 7: ...ightness twice as brighter as originally lighting For checking this pixel fault input 100 of each R G B colour and find out the cell that is not lighting FLICKER FAULT In the pixel fault a cell that should light originally or not light originally is flashing on and off For checking this pixel fault input ALL BLACK SCREEN signal or 100 of each RGB colour and find out the cell that is flashing on an...

Страница 8: ... used 57 SDITDO O Data for SDI 58 SDITDI I Data for SDI 59 SDITCK I Clock for SDI 60 SDITRST I Reset for SDI 61 IISSD O Not used 62 IISWS O Not used 63 IISSCK O Not used 64 VCCQ33 3 3V power supply 65 VREF1 I Reference voltage setting 66 VREF2 I Reference voltage setting 67 SIF I SIF for VHF UHF tuner 68 SAVDD 3 3V power supply 69 SXIN I 36 864MHz oscillation for sampling clock 70 SXOUT O 36 864MH...

Страница 9: ...3 3V power supply 163 SDA1 I O Data for I2 C bus for tuner audio 164 VCCQ33 3 3V power supply 165 SCL1 O Clock for I2C bus for tuner audio 166 SDA0 I O Data for I2 C bus for EEPROM Pin Pin name I O Function 167 SCL0 O Clock for I2 C bus for E2PROM 168 VCCQ33 3 3V power supply 169 AUDIO_MUTE O Speaker monitor output muting Muting H 170 REMOTE I Remote control sensor input 171 MAIN_POW O Power on of...

Страница 10: ...INAL COVER 3 Remove the 4 screws J 4 Remove the DIGITAL PWB 3 1 6 REMOVING THE SW PWB CONTROL ASSY Fig 3 1 Remove the REAR COVER 1 Remove the 2 screws K 2 Remove the SW PWB 3 Remove the 2 screws L 4 Remove the CONTROL ASSY 3 1 7 REMOVING THE INVERTER PWB Fig 3 1 Remove the REAR COVER 1 Remove the 6 screws M 2 Remove the INVERTER PWB COVER 3 Remove the INVERTER PWB 3 1 8 REMOVING THE SPEAKER Fig 3 ...

Страница 11: ...N N N N X X X X STAND FRONT PANEL CONTROL ASSY SW PWB SPEAKER HOLDER SPEAKER HOLDER SPACER SPEAKER SPEAKER LCD PANEL UNIT TOP FRAME LCD CONTOROL PWB LCD CONTOROL PWB COVER INVERTER PWB COVER BOTTOM FRAME IR LED PWB MAIN BASE TERMINAL BASE STAND BASE COVER POWER CORD COVER POWER CORD ANALOG PWB DIGITAL PWB POWER PWB REAR COVER CHOKE COIL INVERTER PWB ...

Страница 12: ...G INSTRUCTIONS and set the items as described 7 SERVICE MODE SETTING ADJUST MODE SETTING Verify what to set in the SERVICE MODE and set whatever is necessary Fig 3 3 Refer to the SERVICE ADJUSTMENT for setting Input PAL White Raster signal 75 Y 525 mV and SYNC 0 3 V at VDO 2 for adjustment SERVICE MODE SCREEN Fig 3 3 SYSTEM CONSTANT SETTING Symbol Number of pins Mounting PWB Main content of data I...

Страница 13: ...Depends on PR CH EXT Auto Zoom Auto Panoramic Setting item Setting position STEREO I II Stereo sound Bass Centre Treble Centre Balance Centre Cinema Surround Off Setting item Setting position On Timer Off Sleep Timer Off Channel Guard Off ID 0000 Blue Back On Child Lock Off Auto Shutoff Off Favourite Setting Blank Power Lamp On Eco Mode Off Setting item Setting position Auto Program TV channel aut...

Страница 14: ...th the tweezers and remove the chip part Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alternately melt the solder at each lead Shift and remove the chip part NOTE After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern a...

Страница 15: ...in the adjustment items preset the following functions with the REMOTE CONTROL UNIT 4 3 MEASURING INSTRUMENT AND FIXTURES Signal generator Pattern generator PAL Remote control unit 4 4 BASIC OPERATION OF SERVICE MODE 4 4 1 HOW TO ENTER THE SERVICE MODE 1 Press RETURN key and MUTING key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN 4 4 2 HOW TO EXIT THE SERVICE MODE Pre...

Страница 16: ...0Hz SECAM SECAM NTSC3 NTSC3 58 NTSC4 NTSC4 43 525I 525i 525P 525p 625I 625i 625P 625p 750P5 750p 50Hz 750P6 750p 60Hz 1125I5 1125i 50Hz 1125I6 1125i 60Hz 1125P5 1125P 50Hz 1125P6 1125P 60Hz Others HXGA HDMI XGA SERVICE MODE SCREEN Press 1 key 1 SIGNAL SYSTEM 2 ZOOM MODE 7 SETTING VALUE DATA 5 SETTING ITEM No 6 SETTING ITEM 4 WHITE BALANCE 3 PICTURE MODE S001 R DRIVE MID 128 NTSC3 FULL STD M ADJUST...

Страница 17: ...024 Do not adjust S005 G DRIVE COOL 0000 0255 009 Do not adjust S006 B DRIVE COOL 0000 0255 000 Do not adjust S007 R DRIVE WARM 0000 0255 000 Do not adjust S008 G DRIVE WARM 0000 0255 006 Do not adjust S009 B DRIVE WARM 0000 0255 019 Do not adjust Item Measuring instrument Test point Adjustment part Description WHITE BALANCE HIGHLIGHT Remote control unit Signal generator 1 ADJUST S001 R DRIVE MID ...

Страница 18: ...eck display mode To Clear Reset Failure History Turn off the power by pressing the POWER key on the remote control unit when in the Self check display mode 5 1 4 FAILURE HISTORY Failure history can be counted up to 9 times for each item When the number exceeds 9 display will remain as 9 Failure history will be stored in the memory unless it has been deleted NOTE Only SYNC with without sync signals...

Страница 19: ...on starts 3 seconds after the power is turned on If it checks whenever I2C communication is performed and no reply of ACK signal an error will be counted AUDIO AIO Confirmation of reply of ACK signal which uses I2C communication IC6002 DIGITAL PWB SDA Detection starts 3 seconds after the power is turned on If it checks whenever I2 C communication is performed and no reply of ACK signal an error wi...

Страница 20: ... No YA655 Rev 001 VPT Printed in Japan Victor Company of Japan Limited Display Division 12 3 chome Moriya cho Kanagawa ku Yokohama city Kanagawa prefecture 221 8528 Japan ...

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