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JVC LT-26C31BJE Service Manual

Lcd flat television
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SERVICE MANUAL
11
2003
YA014
LT-26C31BJE, LT-26C31BUE,
LT-26C31SJE, LT-26C31SUE
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-45
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
LCD FLAT TELEVISION

TABLE OF CONTENTS

BASIC CHASSIS
MK
No.YA014
2003/11

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Summary of Contents for JVC LT-26C31BJE

  • Page 1: Table Of Contents

    SERVICE MANUAL LCD FLAT TELEVISION YA014 2003 LT-26C31BJE, LT-26C31BUE, LT-26C31SJE, LT-26C31SUE BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions (W × H × D) 70.3 cm × 56.0 cm × 2.6 cm (Included stand) 70.3 cm × 49.1 cm × 9.4 cm (TV only) Mass 19.0 kg (Included stand) 18.3 kg (TV only) TV RF System CCIR B/G, I, D/K, L Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43 (NTSC:EXT only).

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS [EXCEPT FOR UK] (1) The design of this product contains special hardware, (8) When service is required, observe the original lead dress. many circuits and components specially for safety Extra precaution should be given to assure correct lead purposes.
  • 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 If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. Therefore, please make sure pay attention not to block the heat dissipation vent as well as the ventilation outlet behind the unit and ensure that there is room for ventilation around it.
  • Page 6 (3) When replacing exterior parts, the front (LCD panel) should be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface). MAIN DIFFERENCE LIST Items LT-26C31BUE LT-26C31BJE LT-26C31SUE LT-26C31SJE FRONT PANEL COLOUR BLACK...

  • Page 7: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES 2.1.1 FUNCTION / CIRCUITS EXT-1 EXT-3 EXT-4 • DIST (Digital Image Scaling Technology) employs an interpolation method that doubles the scanning lines to realize 1250-line flicker- free picture making it especially suitable for reproducing high- resolution pictures even on large-screen displays.
  • Page 8 TECHNICAL INFORMATION 2.2.1 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. 2.2.1.1 STRUCTURE The LCD panel of the unit is constructed with the metal chassis that surrounds the panel unit and supports the LCD panel part and the backlight part to protect them.
  • Page 9 2.2.2 MAIN CPU PIN FUNCTION (IC001) Pin No. Pin Name Remark Pin No. Pin Name Remark I/O Data bus I Test purpose I/O Data bus I Test purpose I/O Data bus I Test purpose VSS33 I GND O Test purpose VDD33 I 3.3V P2.8...
  • Page 10 2.2.3 SUB CPU PIN FUNCTION (IC7807) Pin No. Pin name Function (SYSTEM0) (SYSTEM3) AVCC Sub clock Sub clock Internal down voltage Reset [Reset : L] TEST Operation test for SUB CPU OSC2 10MHz oscillation for system clock OSC1 10MHz oscillation for system clock Not used Not used BL_D2...

  • Page 11: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE CAUTION: Since this model is a laminating structure assembly, please perform in following order in the case of disassembling. 3.1.1 REMOVING THE STAND ASS'Y (Fig.3-1-1) (1) Remove the 2 screws [A], and remove the COVER. (2) Remove the 4 screws [B], and remove the STAND ASS'Y.
  • Page 12 3.1.3 REMOVING THE FUN BRACKET, REGULATOR PWB AND POWER CORD (Fig.3-1-3) • Remove the STAND ASS'Y. • Remove the REAR COVER. FUN BRACKET (1) Disconnect the wire(CONN. [Y]) of FUN MOTOR. (2) Remove the 5 screws [F], and remove the FUN BRACKET. (3) Remove the REGULATOR PWB, and disconnect the FUN MOTOR POWER CORD.
  • Page 13 3.1.6 REMOVING THE VIDEO PWB (Fig.3-1-6) JACK BASE • Remove the STAND ASS'Y. VIDEO PWB • Remove the REAR COVER. (1) Remove the 2 screws [N] and 1 screws [P], then remove TUNER PWB MSP PWB the JACK BASE. (2) Remove the 4 screws [Q], and remove the VIDEO PWB. (3) Remove the 2 screws [R], and remove the TUNER PWB BASE.
  • Page 14 3.1.9 REMOVING THE SPEAKER (Fig.3-1-9A, Fig.3-1-9B) • Remove the STAND ASS'Y. SPEAKER BOX • Remove the REAR COVER. • Remove the POWER CORD. (1) Remove the 5 screws [a], and remove the SPEAKER BOX. Fig.3-1-9A (2) Remove the 4 screws [b], and remove the SPEAKER (L/R). (3) Remove the 4 screws [c], and remove the DUCT COVER/ DUCT BASE/DUCT COVER DUCT BASE.
  • Page 15 3.1.10 REMOVING THE LCD PANEL (Fig.3-1-10A, Fig.3-1-10B, Fig.3-1-10C) • Remove the STAND ASS'Y. • Remove the REAR COVER. • Remove the POWER CORD. • Remove the RECEIVER PWB. • Remove the FRONT CONTROL PWB. • Remove the FRONT SENSOR PWB. •...
  • Page 16 REPLACEMENT OF MEMORY IC This unit uses the nonvolatile memory IC.The memory IC memories data for video and deflection circuits. To replace the memory IC without the data written, malfunctions might occurred while power is on, and the normal image might not appear. When replacing the memory IC, be sure to use the IC written with the initial values of data.
  • Page 17 3.2.3.2 USER SETTINGS OF MENU Setting item Setting value Setting item Setting value POWER SOUND SETTING CHANNEL A. H. B BASS Center PRESET CHANNEL Refer to TREBLE Center OPERATING INSTRUCTIONS BALANCE Center VOLUME SPEAKER PICTURE SETTING PICTURE MODE BRIGHT 3D SOUND COLOUR TEMP.
  • Page 18 3.2.3.4 SERVICE MENU SETTING ITEMS Setting item Setting value Setting item Setting value 1.IF 1.VCO 6.STATUS (Do not adjust) 2.ATT ON/OFF 2.V/C 1.CUT OF R 7.VNR 1.MYLV 2.CUT OF G (Do not adjust) 2.ONMVF 3.CUT OF B 3.MYCOR 4.DRIVE R 4.MYGA 5.DRIVE G 5.YEGON...
  • Page 19 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 20: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION MEASURING INSTRUMENT AND FIXTURES (1) Prior to the following procedure, be sure to connect the • DC voltmeter (or Digital voltmeter) receiver unit and the display unit. • Oscilloscope (2) Adjustment of many Majority of the adjustment items for •...
  • Page 21 ADJUSTMENT LOCATION & WIRING (No.YA014)1-21...
  • Page 22 SERVICE MENU SCREEN SERVICE MENU SERVICE MENU 1. IF 2. V/C 3. AUDIO 4. DD/CM 5. VSM PRESET 6. STATUS 7. VNR 8. IP 9. SHIPPING (OFF) 0. BUS FREE 1-9 : SELECT i : EXIT 1.IF 4. DD/CM IF SERVICE MENU DD/CM 1.
  • Page 23 BASIC OPERATION OF THE SERVICE MENU MODE [USING REMOTE CONTROL UNIT] 4.5.1 TOOLS OF SERVICE MENU OPERATION 4.5.5 SETTINGS OF THE SERVICE MENUS Operate the SERVICE MENU with the remote control unit. 4.5.5.1 [1. IF] (VCO adjustment, ATT setting) 4.5.2 HOW TO ENTER THE SERVICE MENU MODE [Do not adjust] (1) Press the [INFORMATION] key and the [MUTING] key of the REMOTE CONTROL UNIT simultaneously, and the...
  • Page 24 DEFAULT VALUES IN THE SERVICE MENU SETTING MODE • Perform fine-tuning based on the "default values" using the remote control when in the SERVICE MENU setting mode. • The "default 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 25 Setting value Variable Item No. Item range SECAM NTSC R GAIN 0000~0255 0249 0249 0249 (NO DISPLAY) -128~0127 0000 0000 0000 G GAIN 0000~0255 0255 0255 0255 (NO DISPLAY) -128~0127 0001 0001 0001 B GAIN 0000~0255 0254 0254 0254 (NO DISPLAY) -128~0127 0000 0000...
  • Page 26 Setting value Variable Item No. Item range SECAM NTSC (NO DISPLAY) 0000~0015 0000 0000 0000 (NO DISPLAY) 0000~0255 0000 0000 0000 (NO DISPLAY) 0000~0015 0000 0000 0000 (NO DISPLAY) 0000/0001 0001 0001 0001 (NO DISPLAY) 0000~0127 0016 0016 0016 (NO DISPLAY) 0000/0001 0000 0000...
  • Page 27 4.6.1.2 AUDIO SYSTEM Variable Item No. Item Setting value range (NO DISPLAY) 0000~0007 0001 (NO DISPLAY) 0000~0007 0001 (NO DISPLAY) 0000~0007 0001 (NO DISPLAY) 0000~0007 0000 (NO DISPLAY) 0000~0009 0003 (NO DISPLAY) 0000~0015 0004 (NO DISPLAY) 0000~0015 0006 (NO DISPLAY) 0000~0015 0003 (NO DISPLAY)
  • Page 28 4.6.3 [4.DD/CM] NOTE: • For reference, initial setting values (except OSD-G/B/R) in the following conditions are written here. • Input signal : PAL/SECAM/NTSC • Picture mode : Standard • Zoom : Full • Multi screen : Single screen • Colour temp. : Normal Setting value Variable Item No.
  • Page 29 Setting value Variable Item No. Item range SECAM NTSC CMT03 (NO DISPLAY) 0000~0255 0030 0030 0020 CMT04 (NO DISPLAY) 0000~0255 0030 0030 0030 CMT05 (NO DISPLAY) 0000~0063 0059 0059 0060 CMT06 (NO DISPLAY) -128~0127 0005 0005 -002 CMT07 (NO DISPLAY) -128~0127 0002 0002...
  • Page 30 Setting value Variable Item No. Item range SECAM NTSC CMT48 (NO DISPLAY) 0000/0001 0000 0000 0000 CMT49 (NO DISPLAY) 0000/0001 0001 0001 0001 CMT50 (NO DISPLAY) 0000~0031 0021 0021 0021 CMT51 (NO DISPLAY) 0000~0031 0021 0021 0021 CMT52 (NO DISPLAY) 0000/0001 0000 0000...
  • Page 31 4.6.5 [8.IP] (*All fixed) NOTE: • For reference, initial setting values in the following conditions are written here. • Input signal : PAL/SECAM/NTSC • Picture mode : Standard • Zoom : Full • Multi screen : Single screen • Colour temp. : Normal Setting value Variable Item No.
  • Page 32 Setting value Variable Item No. Item range SECAM NTSC PPB029 (NO DISPLAY) 0000~00FF 0000 0000 0000 PPB030 (NO DISPLAY) 0000~00FF 0000 0000 0000 PPB031 (NO DISPLAY) 0000~001F 0000 0000 0000 PPB032 (NO DISPLAY) 0000~00FF 0000 0000 0000 PPB033 (NO DISPLAY) 0000~00FF 0000 0000...
  • Page 33 Setting value Variable Item No. Item range SECAM NTSC ADS026 (NO DISPLAY) 0000/0001 0001 0001 0001 ADS027 (NO DISPLAY) 0000/0001 0001 0001 0001 ADS028 (NO DISPLAY) 0000/0001 0001 0001 0001 ADS029 (NO DISPLAY) 0000/0001 0000 0000 0000 ADS030 (NO DISPLAY) 0000~001F 0003 0003...
  • Page 34 Setting value Variable Item No. Item range SECAM NTSC IPA035 (NO DISPLAY) 0000/0001 0001 0001 0001 IPA036 (NO DISPLAY) 0000~003F 000D 000D 000D IPA037 (NO DISPLAY) 0000~003F 000D 000D 000D IPA038 (NO DISPLAY) 0000~003F 0010 0010 0010 IPA039 (NO DISPLAY) 0000~0003 0001 0001...
  • Page 35 Setting value Variable Item No. Item range SECAM NTSC IPA080 (NO DISPLAY) 0000/0001 0000 0000 0000 IPA081 (NO DISPLAY) 0000/0001 0000 0000 0000 IPA082 (NO DISPLAY) 0000/0001 0000 0000 0000 IPA083 (NO DISPLAY) 0000/0001 0000 0000 0000 IPA084 (NO DISPLAY) 0000/0001 0000 0000...
  • Page 36 Setting value Variable Item No. Item range SECAM NTSC IPB001 (NO DISPLAY) 0000~00FF 0001 0001 0001 IPB002 (NO DISPLAY) 0000~00FF 0001 0001 0003 IPB003 (NO DISPLAY) 0000~000F 0000 0000 0000 IPB004 (NO DISPLAY) 0000~00FF 0000 0000 0000 IPB005 (NO DISPLAY) 0000~000F 0000 0000...
  • Page 37 Setting value Variable Item No. Item range SECAM NTSC IPB046 (NO DISPLAY) 0000~00FF 008B 008B 008B IPB047 (NO DISPLAY) 0000~000F 0000 0000 0000 IPB048 (NO DISPLAY) 0000~00FF 0000 0000 0000 IPB049 (NO DISPLAY) 0000~000F 0000 0000 0000 IPB050 (NO DISPLAY) 0000~00FF 000F 000F...
  • Page 38 Setting value Variable Item No. Item range SECAM NTSC IPC001 (NO DISPLAY) 0000~0003 0002 0002 0002 IPC002 (NO DISPLAY) 0000~00FF 00EA 00EA 00EA IPC003 (NO DISPLAY) 0000/0001 0000 0000 0000 IPC004 (NO DISPLAY) 0000/0001 0000 0000 0000 IPC005 (NO DISPLAY) 0000~000F 0000 0000...
  • Page 39 Setting value Variable Item No. Item range SECAM NTSC IPD001 (NO DISPLAY) 0000~00FF 0040 0040 0040 IPD002 (NO DISPLAY) 0000~00FF 0000 0000 0000 IPD003 (NO DISPLAY) 0000~00FF 0000 0000 0000 IPD004 (NO DISPLAY) 0000~0007 0000 0000 0000 IPD005 (NO DISPLAY) 0000~00FF 0000 0000...
  • Page 40 Setting value Variable Item No. Item range SECAM NTSC IPD046 (NO DISPLAY) 0000/0001 0000 0000 0000 IPD047 (NO DISPLAY) 0000~00FF 0000 0000 0000 IPD048 (NO DISPLAY) 0000~00FF 0000 0000 0000 IPD049 (NO DISPLAY) 0000~00FF 0090 0090 0090 IPD050 (NO DISPLAY) 0000~0007 0000 0000...
  • Page 41 ADJUSTMENT PROCEDURE 4.7.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument VCO (AFC) Remote control [1.IF] (1) Receive a PAL colour bar signal. check unit 1.VCO(CW) (2) Select "1. IF" from the SERVICE MENU. (3) Select "1. VCO." Signal generator (4) Make sure that an arrow of "MAIN"...
  • Page 42 Measuring Item Test point Adjustment part Description instrument Remote control [2. V/C] (1) Receive a PAL black and white pattern signal CONTRAST unit 10. CONT (colour off). (Contrast) (2) Select "2. V/C" from the SERVICE MENU. Signal generator (3) Adjust < 10. CONT > (Contrast) to set the white part to be white.
  • Page 43 Measuring Item Test point Adjustment part Description instrument SUB-SCREEN Remote control [2. V/C] (1) Receive a PAL black and white pattern signal BRIGHTNESS unit 11. TWN BRG (including 0% black signal). (Sub-screen (2) Select "2. V/C" from the SERVICE MENU. Signal generator bright) (3) Adjust <...
  • Page 44 Measuring Item Test point Adjustment part Description instrument PAL/SECAM/ Remote control [2. V/C] - SUB-SCREEN PAL COLOUR - NTSC unit 16. TWN COL (1) Receive a PAL colour bar signal (full field colour SUB-SCREEN (Sub-screen bar). COLOUR Signal generator colour) (2) Select "2.

  • Page 45: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.YA014)1-45...
  • Page 46 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan (No.YA014) Printed in Japan...

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