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JVC LT-37X688 - 37" LCD TV, Service Manual

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JVC LT-37X688 - 37

(No.YA535)1-7

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1

SYSTEM SETTEING

(1) Set to "0 minutes" using the 

[SLEEP]

 key.

(2) While "0 minutes" is displayed, press the 

[VIDEO]

 key and

[DISPLAY]

 key simultaneously, then enter the SERVICE

MODE.

(3) Press the

 [1]

 key in the SERVICE MODE SCREEN. (Fig.1)

(4) Press the 

[2]

 key in the TV-MICRO SERVICE MODE

screen. (Fig.2)

(5)  The SELF CHECK MODE screen is displayed. (Fig.3)
(6) Turn off the power by pressing the 

[POWER]

 key on the

remote control unit.

2.2

FEATURES

Built in ATSC (Advanced Television Systems Committee)
TUNER

This TV can receive both Digital  broadcasting (ATSC) and
Analog broadcasting. 

D.I.S.T. (Digital Image Scaling Technology)

This system uses line interpolation to double the number of
scanning lines and achieve high resolution, flicker-free picture. 

Color Management

This function ensures dull colors are compensated to produce
natural hues.

Picture Management

This function makes it easier to see the dark areas when a
picture has many dark areas, and makes it easier to see the
bright areas when a picture has many bright areas.

Smart Picture

This function detects the APL (Average Picture Level) and
adjusts the contrast suitable for what you are watching.

DIGITAL VNR

This function cuts down the amount of noise in the original
picture. 

MPEG Noise Reduction 

This function effects the block noise removal and mosquito NR
simultaneously.

Sensor Effect

With Sensor Effect ON, a "leaf" icon will appear on your TV
screen when Smart Sensor brightness adjustment occurs.

Be sure to carry out the following operation at the end of
the procedure.

SERVICE MODE SCREEN

TV-MICRO SERVICE MODE SCREEN

SERVICE MENU

SERVICE MENU

   1. TV-Micro Service

   1. TV-Micro Service

   2. Digital Service

   2. Digital Service

   3. Digital Diagnostics

   3. Digital Diagnostics

   4. Digital Engineering Functions

   4. Digital Engineering Functions

SELF CHECK MODE(TV-MICRO) SCREEN

Press [1] key

Press [2] key

Fig.1

Fig.2

Fig.3

TV-Micro Service

TV-Micro Service

  1. ADJUST

  1. ADJUST

  2. SELF CHECK

  2. SELF CHECK

  3. I2C STOP

  3. I2C STOP

LOB    0         FAN    0

LOB    0         FAN    0

AUD    0          

AUD    0          

                 

                 

ANA    9         DIG    9

ANA    9         DIG    9

       

       

  0000                  0

  0000                  0

                        0

                        0

Summary of Contents for LT-37X688 - 37" LCD TV

Page 1: ...T TELEVISION YA535 2007 7 SERVICE MANUAL LT 37X688 V LT 42X688 C COPYRIGHT 2007 Victor Company of Japan Limited TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 7 3 DISASSEMBLY 1 10 4 ADJUSTMENT 1 18 5 TROUBLESHOOTING 1 31 BASIC CHASSIS FN2 Illustration of LT 37X688 ...

Page 2: ...el 191 Channels Intermediate Frequency Analog Video IF Sound IF 45 75 MHz 41 25 MHz 4 5 MHz Color Sub Carrier Frequency Analog 3 58 MHz LCD panel 37V inch wide aspect 16 9 42V inch wide aspect 16 9 Screen Size Diagonal 94 0 cm H 820 cm V 46 0 cm Diagonal 106 7 cm H 93 5 cm V 52 8 cm Display Pixels Horizontal 1920 dots Vertical 1080 dots W UXGA Audio Power Output 10 W 10 W Speaker 4 0 cm 16 0 cm tw...

Page 3: ...ts 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 shafts ...

Page 4: ... prevent the unit from tipping in order to protect against accidents and earthquakes 1 2 3 INSTALLATION REQUIREMENTS To ensure safety in an emergency such as an earthquake and to prevent accidents ensure that measures are taken to prevent the TV dropping or falling over 1 2 4 NOTES ON HANDLING When taking the unit out of a packing case do not grasp the upper part of the unit If you take the unit o...

Page 5: ...during transportation and storage as the LCD panel is very vulnerable to lateral impacts and may break During transportation ensure that the unit is loaded along the traveling direction of the vehicle and avoid stacking them on one another For storage ensure that they are stacked in 2 layers or less even when placed upright 1 3 2 OPTICAL FILTER ON THE FRONT OF THE LCD PANEL 1 Avoid placing the uni...

Page 6: ... signal power level of in band This value var ies between 0 and 100 SR This is the Signal noise Ratio RSE This is uncorrectable error packet count Read Solomon Error Correction Processing When this value is not 0 it may have influence on the quality of video or audio However note that this value does not display an exact value depending on tim ing If a signal is weak this error will be occurred bu...

Page 7: ...s when a picture has many dark areas and makes it easier to see the bright areas when a picture has many bright areas Smart Picture This function detects the APL Average Picture Level and adjusts the contrast suitable for what you are watching DIGITAL VNR This function cuts down the amount of noise in the original picture MPEG Noise Reduction This function effects the block noise removal and mosqu...

Page 8: ...is pixel fault input 100 of each R G B color 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 color and find out the cell that is flashing on and off Item Specifications LT 37X688 LT 42X688 Maximum dimensions W ...

Page 9: ...77 NC O Not used 28 CLK2 O Not used 78 NC O Not used 29 RxD2 I Not used Digital tuner control 79 NC O Not used 30 TxD2 O Not used Digital tuner control 80 P1 0 I main CPU update 31 SDA2 I O Not used 81 P0 7 O Not used 32 DIGR1 O R 1 for OSD 82 P0 6 O Not used 33 DIGG1 O G 1 for OSD 83 CEC_INT O Not used 34 DIGB1 O B 1 for OSD 84 WAKE O Release of low power mode for sub chassis CPU Release L 35 TxD...

Page 10: ...R 1 Remove the 6 screws H 2 Remove the ANALOG PWB 3 2 5 REMOVING THE DIGITAL PWB Fig 3 1 Remove the REAR COVER 1 Remove the 1 screw J 2 Remove the DIGITAL BASE 3 Remove the SHIELD COVER 4 Remove the 5 screws K 5 Remove the DIGITAL PWB 6 Remove the 4 screws L 7 Remove the SHIELD BASE CAUTION Make sure to perform the SYSTEM SETTEING when DIGITAL PWB is replaced 3 2 6 REMOVING THE SW PWB Fig 3 1 Remo...

Page 11: ... B A P E C F U U V U L U V U U K J N M N T S T W W T T Q R R REAR COVER SPEAKER STAND ASS Y CONTROL KNOB CONTROL SW PWB POWER CORD HOLDER POWER CORD DIGITAL PWB LED PWB ANALOG PWB SPEAKER LCD PANEL UNIT FRONT PANEL SUPPORT BRACKET SUPPORT BRACKET DIGITAL BASE MAIN POWER PWB a CORD CLAMP SHIELD BASE ...

Page 12: ...e the SHIELD BASE CAUTION Make sure to perform the SYSTEM SETTEING when DIGITAL PWB is replaced 3 3 6 REMOVING THE SW PWB Fig 3 2 Remove the REAR COVER 1 Remove the 2 screws M 2 Remove the SW PWB 3 Remove the 2 screws N 4 Remove the CONTROL KNOB 3 3 7 REMOVING THE LED PWB Fig 3 2 Remove the REAR COVER Remove the STAND ASS Y 1 Remove the 2 screw P 2 Remove the STAND BASE COVER 3 Remove the 2 screws...

Page 13: ...STAND BASE SUPPORT MAIN BASE SHIELD COVER SHIELD BASE B H G D C D B P E C U J U T N M N S S S S Q T K L R F REAR COVER SPEAKER STAND ASS Y CONTROL KNOB SW PWB POWER CORD HOLDER POWER CORD LED PWB ANALOG PWB SPEAKER LCD PANEL UNIT FRONT PANEL POWER PWB a A CORD CLAMP DIGITAL PWB SHIELD BASE ...

Page 14: ...ry Refer to the SERVICE ADJUSTMENT for setting 3 4 3 SERVICE MODE SETTING ITEMS Symbol Number of pins Mounting PWB Main content of data IC6401 48 pin DIGITAL PWB Program Video process of IC6001 System CPU is memorized IC7002 8 pin DIGITAL PWB Setting value of IC7001 MAIN CPU is memorized Setting items Settings Item No TV Micro Service Video system setting Adjust S001 S009 Not used Fixed T001 T003 ...

Page 15: ...0 0 0 0 0 0 0 Detail 0 0 10 10 0 0 0 0 Energy Saver Mode 10 10 30 30 15 15 0 0 Color Temperature LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH Color Management ON ON ON ON ON ON ON ON Dynamic Gamma ON ON ON ON ON ON ON ON Digital VNR AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO MPEG NR ON ON ON ON ON ON ON ON Natural Cinema AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO Position Adjustment Center Center Center Center...

Page 16: ...t Lock Code 0000 Closed Caption Off CC1 T1 Auto Shut Off Off Power Indicator HIGH Optical Out PCM Quick start up Off Setting item Setting position HDMI Size Auto Video 1 Audio Auto Video Input Label All blank Setting item Setting position Bass 0 Treble 0 Balance 0 Turn On Volume Current Volume Limit 50 Setting item Setting position Set Clock Manual On Off Timer Off ...

Page 17: ...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 as i...

Page 18: ...CIRCUIT DIGITAL SERVICE MODE MTS INPUT LEVEL adjustment MTS SEPARATION adjustment 4 5 SERVICE MODE 4 5 1 BASIC OPERATION OF SERVICE MODE Operate the SERVICE MODE with the REMOTE CONTROL UNIT 4 5 1 1 HOW TO ENTER THE SERVICE MODE 1 Set to 0 minutes using the SLEEP key 2 While 0 minutes is displayed press the VIDEO STATUS key and DISPLAY key simultaneously 3 Enter the SERVICE MODE Fig 4 1 Fig 4 1 4 ...

Page 19: ...nnel Map 6 Clear Channel Map 7 Digital Tunig Test DIGITAL SERVICE MODE SCREEN ADJUST MODE TV MICRO SCREEN ADJUST MODE DIGITAL SCREEN TV MICRO SERVICE MODE SCREEN Refer to SECTION 5 Press 1 key Press 2 key Press 1 key Press 2 key Press 3 key Press 1 key DIAGNOSTIC SCREEN SELF CHECK MODE SCREEN Diagnostic 1 I2C Bus Stop 2 Status Monitor 3 Self Check 4 Version 5 USB Device Log DO NOT ADJUST DO NOT AD...

Page 20: ...n MEMORY OF SETTING VALUE DATA Changed setting value is memorized by pressing MUTING key NTSC3 525i Composite S video input 525I 525i Component input 525P 525p 1125I6 1125i 750P 750p PCVGA PC VGA PCXGA PC XGA H525I HDMI 525i H525P HDMI 525p H750P HDMI 750p H125I6 HDMI 1125i H125P6 HDMI 1125p D525I ATSC 525i D525P ATSC 525p D125I6 ATSC 1125i FULL FULL 1609 CINEMA CINEMA ZOOM PANO PANORAMA HD PANORA...

Page 21: ...CE MENU SCREEN 5 Select Channel Map Channel map is forcibly rewritten on this screen Do not adjust CAUTION This mode is not used in the ADJUSTMENT Press the BACK key to return to the SERVICE MENU SCREEN 6 Clear Channel Map Channel map is cleared on this screen Do not adjust CAUTION This mode is not used in the ADJUSTMENT Press the BACK key to return to the SERVICE MENU SCREEN 7 Digital Tuning Test...

Page 22: ...00 063 M001 1E00 00 FF M002 1E01 00 FF M003 1E02 00 FF M004 1E03 00 FF M005 1E04 00 FF M006 1E05 00 FF M007 1E06 00 FF M008 1E07 00 FF M009 1E08 00 FF M010 1E09 00 FF M011 1E0A 00 FF M012 1E0B 00 FF M013 1E0C 00 FF M014 1E0D 00 FF M015 1E0E 00 FF M016 1E0F 00 FF M017 1E10 00 FF M018 1E11 00 FF M019 1E12 00 FF M020 1E13 00 FF M021 1E14 00 FF M022 1E15 00 FF M023 1E16 00 FF M024 1E17 00 FF M025 1E18...

Page 23: ...FF M108 1E6B 00 FF M109 1E6C 00 FF M110 1E6D 00 FF M111 1E6E 00 FF Item No Item Variable range Setting value M112 1E6F 00 FF M113 1E70 00 FF M114 1E71 00 FF M115 1E72 00 FF M116 1E73 00 FF M117 1E74 00 FF M118 1E75 00 FF M119 1E76 00 FF M120 1E77 00 FF M121 1E78 00 FF M122 1E79 00 FF M123 1E7A 00 FF M124 1E7B 00 FF M125 1E7C 00 FF M126 1E7D 00 FF M127 1E7E 00 FF M128 1E7F 00 FF M129 1E80 00 FF M13...

Page 24: ... FF M190 1EBD 00 FF M191 1EBE 00 FF M192 1EBF 00 FF M193 1EC0 00 FF M194 1EC1 00 FF M195 1EC2 00 FF M196 1EC3 00 FF M197 1EC4 00 FF M198 1EC5 00 FF M199 1EC6 00 FF M200 1EC7 00 FF M201 1EC8 00 FF M202 1EC9 00 FF M203 1ECA 00 FF Item No Item Variable range Setting value M204 1ECB 00 FF M205 1ECC 00 FF M206 1ECD 00 FF M207 1ECE 00 FF M208 1ECF 00 FF M209 1ED0 00 FF M210 1ED1 00 FF M211 1ED2 00 FF M2...

Page 25: ...U GAIN 0H FFH 5A C010 RED OFST 0H FFH 40H 40H 40H 40H C011 RED OFST 0H FFH 0H 0H 0H 0H C012 GRN OFST 0H FFH 8H 8H 8H 8H C013 GRN OFST 0H FFH 0H 0H 0H 0H C014 BLU OFST 0H FFH 40H 40H 40H 40H C015 BLU OFST 0H FFH 0H 0H 0H 0H C016 SYNC SEP 0H FFH 20H C017 HSYNC 0H FFH E8H C018 HSYC DUR 0H FFH 7EH 7DH D9H 99H C019 VSYNC 0H FFH 18H C020 VSYC DUR 0H FFH AH AH AH AH C021 PRECOR 0H FFH 10H C022 POSTCOR 0H...

Page 26: ...2DH X014 VSYNC W 0H FFH 5H X015 HSYNC P 0H FFH 0H X016 VSYNC P 0H FFH 0H X017 INTERLACE ENABLE 0H FFH 1H X018 PIXEL CLOCK 0 0H FFH 6H X019 PIXEL CLOCK 1 0H FFH D5H X020 PIXEL CLOCK 2 0H FFH 6BH X021 PIXEL CLOCK 3 0H FFH 4H X022 PMON PIXEL CLOCK 0 0H FFH 6H X023 PMON PIXEL CLOCK 1 0H FFH D5H X024 PMON PIXEL CLOCK 2 0H FFH 6BH X025 PMON PIXEL CLOCK 3 0H FFH 4H X026 PMON GR ADJUST X L 0H FFH 0H X027 ...

Page 27: ...OMP HD 0 200 0 X126 GREEN OFFSET COMP HD 0 200 0 X127 BLUE OFFSET COMP HD 0 200 0 X128 RED OFFSET DIGITAL 0 200 0 X129 GREEN OFFSET DIGITAL 0 200 0 X130 BLUE OFFSET DIGITAL 0 200 0 X131 RED OFFSET HDMI 0 200 0 X132 GREEN OFFSET HDMI 0 200 0 X133 BLUE OFFSET HDMI 0 200 0 X134 RED OFFSET PV 0 200 0 X135 GREEN OFFSET PV 0 200 0 X136 BLUE OFFSET PV 0 200 0 X201 SERA MODE ARF 00 06 0 SERA TIME1 ARF 0 2...

Page 28: ... 0H FFH 7H S009 HY FILT ATSC 525i 0H FFH 7H S010 HY FILT ATSC 525p 0H FFH 7H S011 HY FILT ATSC 750p 0H FFH 7H S012 HY FILT ATSC 1125i 0H FFH 7H S013 HUV FILT NTSC 0H FFH 7H S014 HUV FILT CVS 0H FFH 7H S015 HUV FILT Comp 525i 0H FFH 7H S016 HUV FILT Comp 525p 0H FFH 7H S017 HUV FILT Comp 750p 0H FFH 7H S018 HUV FILT Comp 1125i 0H FFH 7H S019 HUV FILT PV 0H FFH 7H S020 HUV FILT GAME 0H FFH 7H S021 H...

Page 29: ...VY FILT GAME 0H FFH 3H S033 VY FILT ATSC 525i 0H FFH 3H S034 VY FILT ATSC 525p 0H FFH 3H S035 VY FILT ATSC 750p 0H FFH 3H S036 VY FILT ATSC 1125i 0H FFH 3H Item No Item Variable range Setting value RF CVS ATSC HDMI PV COMPONENT 480i 480p 1080i 720p ...

Page 30: ... part Description MTS INPUT LEVEL Remote control unit 1 Adjust A001 IN LEVEL 1 Receive any broadcast 2 Select the Digital Service from the SERVICE MENU 3 Select the 1 Adjust 4 Select the A001 IN LEVEL 5 Set the initial setting value of A001 6 Press the MUTING key to memorize the set value MTS SEPARATION TV audio multiplex signal generator Oscilloscope Remote control unit R OUT L OUT AUDIO OUT 1 Ad...

Page 31: ...O SERVICE MODE 4 Press the 2 key in the SELF CHECK MODE TV MI CRO SELF CHECK MODE DIGITAL 1 Set to 0 minutes using the SLEEP key 2 Press the VIDEO STATUS key and DISPLAY key simultaneously then enter the service mode 3 Press the 3 key in the DIAGNOSTICS MODE 4 Press the 2 key in the SELF CHECK MODE DIGITAL SERVICE MODE SCREEN TV MICRO SERVICE MODE SCREEN Press 1 key Press 3 key DIAGNOSTICS MODE SC...

Page 32: ... Self check is performed for the following items SELF CHECK MODE TV MICRO SELF CHECK MODE DIGITAL Detection item Display Detection content Diagnosis signal line Detection timing Low bias line short protection LOB Confirm the operation of the low bais 5V 12V 14V 24V protection circuit IC9651 Q9051 Q9151 ANALOG PWB LB_PRO At 3 seconds after the power is turned on the self check function starts If NG...

Page 33: ...link of the POWER LED Explanation of operation If error is detected the power is turned off Shortly after a power is turned off POWER LED will be blinked Power cannot be turned on until the power cord takes out and inserts after a power is turned off Type of error POWER LED flash cycle Low bias line short protection LED turnig on and off at 1 second intervals ...

Page 34: ... No YA535 VPT Printed in Japan Victor company of Japan Limited Display category 12 3 chome Moriya cho Kanagawa ku Yokohama city Kanagawa prefecture 221 8528 Japan ...

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