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JVC AV-28F3SJ Service Manual
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JVC AV-28F3SJ Service Manual

JVC AV-28F3SJ Service Manual

Flat colour television
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SERVICE MANUAL
FLAT COLOUR TELEVISION
2
2005
YA225
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
AV-28F3SJ

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA225
2005/2

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Summary of Contents for JVC AV-28F3SJ

  • Page 1: Table Of Contents

    YA225 2005 AV-28F3SJ TABLE OF CONTENTS PRECAUTION............... . . 1-4 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Item Content Dimensions ( W × H × D ) 80.5cm × 49.5cm × 48.6cm Mass 41.0kg TV RF System CCIR (I) Colour System TV Mode PAL Video Mode PAL / NTSC 3.58 / NTSC 4.43 Sound System A2 / NICAM Teletext System FLOF (Fastext) / TOP / WST Receiving Frequency...
  • Page 3 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2 / EXT-3 Pin No. Signal designation Matching value EXT-1 EXT-2 EXT-3 500mV(rms) (Nominal), AUDIO R output Used (TV OUT) Used (LINE OUT) Not used Low impedance 500mV(rms) (Nominal), AUDIO R input Used (R1) Used (R2) Used (R3) High impedance...

  • Page 4: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (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: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES • It is a remote controlled colour television. • Child Lock. • It can tune cable channels. • Blue Background • Controlling the TV is very easy by its menu driven system. • Panoramic mode •...

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER 3.1.9 CHECKING THE PW BOARD (1) Unplug the power cord. • To check the back side of the PW Board. (2) Remove the 8 screws [A]. (1) Pull out the PW Board. (Refer to REMOVING THE MAIN (3) Remove the 4 screws [B].
  • Page 7 (x8) REAR COVER (x4) BACK DOOR (x4) MAIN PWB CHASSIS BASE (x2) SIDE CONTROL PWB (x2) (x2) CRT SOCKET PWB SPEAKER TWEETER (x2) (x4) (x2) PICTURE TUBE LED PWB (x2) FRONT AV & HEADPHONE POWER SWITCH PWB JACK PWB Fig.1 (No.YA225)1-7...
  • Page 8 SETTING OF THE LAST MEMORY FOR SHIPMENT 3.2.1 USER SETTING VALUES Setting item Setting value Setting item Setting value PICTURE MENU INSTALL. MENU BRIGHTNESS PROGRAMME These adjust are automatically CONTRAST BAND restored when AUTO PROGRAM COLOUR bit in Service menu is set. CHANNEL The procedure for setting AUTO SHARPNESS...
  • Page 9 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 10: 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 Center basis of the initial setting values, however, the new setting...
  • Page 11 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 in the main menu, and the SERVICE STAND BY/POWER MENU screen (Fig.1) will be displayed. MUTING key SERVICE MENU DIRECT PROGRAM...

  • Page 12: Do Not Adjust

    4.5.4 SERVICE MENU SCREEN SERVICE MENU SERVICE ****** ADJUST... ****** OPTIONS... ADJUST MENU ADJUST... SETTING ITEM No. SETTING VALUE 000~155 Do Not Adjust OPTIONS MENU OPTIONS.. ******** ******** ******** ******** ******** ******** ******** ******** ******** ******** SETTING ITEM No. SETTING VALUE 000~063 NOTE: Do not adjust the OPTIONS MENU.
  • Page 13 ADJUSTMENTS PROCEDURE 4.6.1 FOCUS ADJUSTMENT Measuring Item Test point Adjustment part Description instrument FOCUS Signal FOCUS VR (1) Receive a PAL crosshatch signal. adjustment generator [On the FBT] (2) Adjust FOCUS VR on the FBT as thin as possible. Remote control unit FOCUS VR SCREEN VR...
  • Page 14 4.6.4 DEFLECTION CIRCUIT ADJUSTMENT Measuring Item Test point Adjustment part Description instrument VERTICAL Signal 030 (REGULAR) (1) Receive a PAL circle pattern signal. POSITION generator 040 (PANORAMIC) (2) Enter the SERVICE MODE. adjustment 050 (14:9 ZOOM) (3) Select ADJUST MENU. Remote 060 (16:9 ZOOM) (4) Select 030.
  • Page 15 Measuring Item Test point Adjustment part Description instrument VERTICAL Signal 032 (REGULAR) (1) Receive a PAL crosshatch signal. S-CORRECTION generator 033 (REGULAR) (2) Enter the SERVICE MODE. & LINEARITY 042 (PANORAMIC) (3) Select ADJUST MENU. adjustment Remote 043 (PANORAMIC) (4) Select 032 (REGULAR). control unit 052 (14:9 ZOOM) (5) Adjust 032 until the size of squares on both the...
  • Page 16 Measuring Item Test point Adjustment part Description instrument HORIZONTAL Signal 039 (REGULAR) (1) Receive a PAL crosshatch signal. SIZE generator 049 (PANORAMIC) (2) Enter the SERVICE MODE. adjustment 059 (14:9 ZOOM) (3) Select ADJUST MENU. Remote 069 (16:9 ZOOM) (4) Select 039 (REGULAR). control unit 079 (16:9 ZOOM (5) Adjust 039 until vertical lines on both the left and...
  • Page 17 Measuring Item Test point Adjustment part Description instrument TRAPEZIUM Signal 034 (REGULAR) (1) Receive a PAL crosshatch signal. adjustment generator 044 (PANORAMIC) (2) Enter the SERVICE MODE. 054 (14:9 ZOOM) (3) Select ADJUST MENU. Remote 064 (16:9 ZOOM) (4) Select 034 (REGULAR). control unit 074 (16:9 ZOOM (5) Adjust 034 until vertical lines, especially lines at the...
  • Page 18 Measuring Item Test point Adjustment part Description instrument CORNER Signal 036 (REGULAR) (1) Receive a PAL crosshatch signal. adjustment generator 037 (REGULAR) (2) Enter the SERVICE MODE. 046 (PANORAMIC) (3) Select ADJUST MENU. Remote 047 (PANORAMIC) (4) Select 036 (REGULAR). control unit 056 (14:9 ZOOM) (5) Adjust 036 until vertical lines at the upper corners of...
  • Page 19 Measuring Item Test point Adjustment part Description instrument NTSC Signal 135 (REGULAR) (1) Receive a NTSC crosshatch signal. HORIZONTAL generator (2) Enter the SERVICE MODE. SIZE 142 (FULL) (3) Select ADJUST MENU. adjustment Remote (4) Select 135 (REGULAR). control unit (5) Adjust 135 until vertical lines on both the left and right part of the cross-hatch will be visible nor screen Very...
  • Page 20 Measuring Item Test point Adjustment part Description instrument NTSC Signal (1) Receive a NTSC crosshatch signal. HORIZONTAL generator (2) Enter the SERVICE MODE. SIZE 142 (16:9 mode) (3) Select ADJUST MENU. adjustment Remote (4) Select 135. control unit (5) Adjust 135 until vertical lines on both the left and right part of the cross-hatch will be visible nor screen Very Very...
  • Page 21 4.6.5 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal (1) Receive a PAL black & white signal. BALANCE generator (2) Enter the SERVICE MODE. adjustment (3) Select ADJUST MENU. Remote (4) Select 023, 024 and 025 respectively. control unit (5) Adjust 023, 024 and 025 respectively, until the white part turns to pure white without any other colour.

  • Page 22: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. 1-22 (No.YA225)
  • Page 23 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.YA225) Printed in Japan...