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JVC AV-28EH1SUG Service Manual
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JVC AV-28EH1SUG Service Manual

JVC AV-28EH1SUG Service Manual

Colour television
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SERVICE MANUAL
7
2003
52172
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
5
TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
COLOUR TELEVISION
AV-28EH1SUG

TABLE OF CONTENTS

No.52172
2003/7

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Summary of Contents for JVC AV-28EH1SUG

  • Page 1: Table Of Contents

    52172 2003 AV-28EH1SUG TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Item Content Dimensions ( W × H × D ) 76.0cm × 58.9cm × 47.5cm Mass 32.3kg TV RF System CCIR (B/G, D/K, I , L/L') Colour System PAL / SECAM / NTSC (Only in EXT mode) Stereo System A2 (B/G, D/K) / NICAM (B/G, I, D/K, L) Teletext System FLOF (Fastext)

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (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: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS 21-pin Euro connector (SCART) : EXT-1/EXT-2 Pin No. Signal designation Matching value EXT-1 EXT-2 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT) AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2) AUDIO L output 500mV(rms) (Nominal), Low impedance...

  • Page 5: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER 3.1.4 CHECKING THE PW BOARD (1) Unplug the power cord. • To check the back side of the PW Board. (2) Remove the 6 screws [A] as shown in the figure. (1) Pull out the CHASSIS.
  • Page 6 MEMORY IC REPLACEMENT 3.2.1 MEMORY IC This TV use memory IC. In the memory IC, there are memorized data for correctly operating the video and deflection circuits. When replacing memory IC with a blanking memory IC, the set is automatically memorized following SERVICE MANU initial data. 3.2.2 MEMORY IC REPLACEMENT PROCEDURE 3.2.3 FACTRY SETTING VALUE There are 21 SERVICE ADJUSTMENT ITEMS.
  • Page 7 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 8: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION (1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components. (2) Make sure that connection is correctly made AC to AC power source. (3) Turn on the power of the TV and measuring instruments for warning up for at least 30 minutes before starting adjustments.

  • Page 9: Main Pwb

    ADJUSTMENT PROCEDURE 4.4.1 LOCAL OSCILLATOR ADJUSTMENT Measuring Item Test point Adjustment part Description instrument Signal (1) Receive a colour bar pattern signal. adjustment generator (2) The frequency of the signal carrier must be accurate Adjustment coil (Max +/-10kHz deviation from the nominal channel Remote : L150 frequency).
  • Page 10 4.4.4 SCREEN ADJUSTMENT Measuring Item Test point Adjustment part Description instrument SCREEN Signal (1) Receive a colour bar pattern signal. adjustment generator (2) Select < G2-SCREEN >. (3) Adjust the SCREEN VR on the FBT to bring the Remote cursor to central position. control unit 4.4.5 WHITE BALANCE ADJUSTMENT Measuring...
  • Page 11 Measuring Item Test point Adjustment part Description instrument HORIZONTAL Signal PARABOLA (1) Receive a cross-hatch pattern signal. SIZE/ generator HOR WIDTH (2) Select < PALABOLA >(Parabola), < HOR WIDTH > SIDE PIN CORNER (Horizontal width), < CORNER >(Top/bottom cor- adjustment Remote HOR PARAL ner), <...

  • Page 12: Trouble Shooting

    SECTION 5 TROUBLE SHOOTING This service manual does not describe TROUBLE SHOOTING. 1-12 (No.52172)
  • Page 13 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.52172) Printed in Japan...