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JVC AV-28ED5BN Service Manual
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JVC AV-28ED5BN Service Manual

JVC AV-28ED5BN Service Manual

Colour television
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SERVICE MANUAL
5
2005
YA316
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
COLOUR TELEVISION
AV-28ED5BN,
AV-28ED5SN

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA316
2005/9

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Summary of Contents for JVC AV-28ED5BN

  • Page 1: Table Of Contents

    COLOUR TELEVISION YA316 2005 AV-28ED5BN, AV-28ED5SN TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 76.0cm × 57.0cm × 47.3cm Mass 33kg TV RF System CCIR (B/G, D/K, L) Colour System SECAM NTSC3.58 / NTSC4.43 (Only EXT mode) Stereo System A2 (B/G, D/K) / NICAM (B/G, D/K, L) Receiving VHF 47MHz - 470MHz Frequency...

  • 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

    COLOUR SYSTEM If the picture is not clear or no colour appears, change the current colour system to another colour system. MAIN DIFFERENCE LIST Items AV-28ED5BN AV-28ED5SN CABINET COLOUR BLACK SILVER 21-PIN EURO CONNECTOR (SCRAT) : EXT-1 / EXT-2 Pin No.

  • Page 5: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER 3.1.10 CHECKING THE PW BOARD (1) Unplug the power cord. • To check the back side of the PW Board. (2) Remove the 8 screws [A] as shown in the Fig. 1. (1) Pull out the PW Board.
  • Page 6 REAR COVER FEATURE BOX MAIN PWB BASE BACK DOOR CRT SOCKET PWB SIDE CONTROL TWEETER SPEAKER LED PWB POWER SWITCH PWB Fig.1 1-6 (No.YA316)
  • Page 7 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 SETTINGS OF FACTORY SHIPMENT 3.2.1.1 BUTTON OPERATION 3.2.1.2...
  • Page 8 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 9: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION (1) You can make the necessary adjustments for this unit with Setting item Setting value either the Remote Control Unit or with the adjustment tools BRIGHTNESS and parts as given below. (2) Adjustment with the Remote Control Unit is made on the CONTRAST Centre basis of the initial setting values, however, the new setting...
  • Page 10 BASIC OPERATION OF SERVICE MODE REMOTE CONTROL UNIT key NAME 4.5.1 HOW TO ENTER THE SERVICE MODE (1) Press the INFORMATION key and MUTING key simultaneously, and the SERVICE MENU 1 screen (Fig.1) will be displayed. SERVICE MENU 1 MUTE key PRODUCTION i >STORE MENU>EXIT...

  • Page 11: Service Menu

    ANGLE G2Cu access FACTRY SETTINGS TRAPEZ PARAB APSW U.COR L.COR TILT TRPZD NTSCHS TXTV EXT3 HS04_3 JVC******* BLUE key ******* select SERVICE SERVICE Do Not Adjust SERVICE MENU 2 PRODUCTION i >STORE MENU>EXIT ADJUSTMENTS OPTIONS PIP CNTRST 0. HPHONE RED key...
  • Page 12 ADJUSTMENTS PROCEDURE 4.6.1 FOCUS ADJUSTMENT Measuring Item Test point Adjustment part Description instrument FOCUS Signal FOCUS VR (1) Receive a crosshatch signal. adjustment generator [On the FBT] (2) Adjust FOCUS VR on the FBT for the lines to become as thin as possible. Remote control unit FOCUS VR...
  • Page 13 4.6.4 DEFLECTION CIRCUIT ADJUSTMENT Measuring Item Test point Adjustment part Description instrument VERTICAL Signal V-SHIFT (1) Receive a circle pattern signal. SHIFT generator (2) Enter the SERVICE MODE. adjustment (3) Press the [RED] key to enter the H/V adjustment Remote group.
  • Page 14 Measuring Item Test point Adjustment part Description instrument HORIZONTAL Signal H-SHIFT (1) Receive a circle pattern signal. SHIFT generator (2) Enter the SERVICE MODE. adjustment (3) Press the [RED] key to enter the H/V adjustment Remote group. control unit (4) Select H-SHIFT. (5) Adjust H-SHIFT to make C=D.
  • Page 15 Measuring Item Test point Adjustment part Description instrument Signal (1) Receive a crosshatch signal. adjustment generator (2) Enter the SERVICE MODE. (3) Press the [RED] key to enter the H/V adjustment Remote group. control unit (4) Select BOW. (5) Adjust BOW until the vertical lines become straight. (6) Check and readjust BOW item if the adjustment becomes improper after some other geometric adjustments are done.
  • Page 16 Measuring Item Test point Adjustment part Description instrument CORNER Signal U.COR (1) Receive a crosshatch signal. adjustment generator (2) Enter the SERVICE MODE. L.COR (3) Press the [RED] key to enter the H/V adjustment Remote group. control unit (4) Select U.COR. (5) Adjust U.COR until vertical lines at the upper corners Straight Straight...
  • Page 17 Measuring Item Test point Adjustment part Description instrument TELETEXT Signal TXTV (1) Receive a crosshatch signal. VERTICAL generator (2) Enter the SERVICE MODE. SIZE (3) Press the [RED] key to enter the H/V adjustment adjustment Remote group. control unit (4) Select TXTV. (5) Adjust TXTV to adjust the proper vertical size of Teletext screen.
  • Page 18 4.6.5 VIDEO CIRCUIT ADJUSTMENT Measuring Item Test point Adjustment part Description instrument WHITE Signal (1) Receive a black & white signal. BALANCE generator (2) Enter the SERVICE MODE. adjustment (3) Press the [GREEN] key to enter the VIDEO Remote adjustment group. control unit (4) Select WdR, WdG and WdB respectively.

  • Page 19: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.YA316)1-19...
  • Page 20 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.YA316) Printed in Japan...

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Av-28ed5sn

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