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JVC AV-28H4BU Service Manual
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JVC AV-28H4BU Service Manual

JVC AV-28H4BU Service Manual

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SERVICE MANUAL
3
2004
YA063
AV-28H4BU, AV-28H4SU,
AV-28H40SU, AV-28H77SK,
AV-32H4BU, AV-32H4SU,
AV-32H40SU, AV-32H47SU,
1
2
3
4
5
6
7
8
9
0
AV
P
MENU
TV
OK
P
TV
AV-28H4SU, AV-28H4BU
AV-32H4SU, AV-32H4BU
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5
TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
COLOUR TELEVISION
AV-32H77SK
AV-28H40SU, AV-28H77SK
AV-32H40SU, AV-32H77SK

TABLE OF CONTENTS

COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
BASIC CHASSIS
ML2
AV-32H47SU
No.YA063
2004/3

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Summary of Contents for JVC AV-28H4BU

  • Page 1: Table Of Contents

    SERVICE MANUAL COLOUR TELEVISION YA063 2004 AV-28H4BU, AV-28H4SU, AV-28H40SU, AV-28H77SK, AV-32H4BU, AV-32H4SU, AV-32H40SU, AV-32H47SU, AV-32H77SK BASIC CHASSIS MENU AV-28H4SU, AV-28H4BU AV-28H40SU, AV-28H77SK AV-32H47SU AV-32H4SU, AV-32H4BU AV-32H40SU, AV-32H77SK TABLE OF CONTENTS PRECAUTION............... . . 1-4 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Content Item AV-28H4BU AV-28H40SU AV-28H77SK AV-28H4SU Dimensions ( W × H × D ) 76.2cm × 52.8cm × 49.3cm 85.4cm × 50.8cm × 49.0cm Mass 39.0kg TV RF System CCIR (B/G, D/K, I, L) CCIR (I) Colour System SECAM NTSC 3.58 / NTSC 4.43...
  • Page 3 Content Item AV-32H4BU AV-32H40SU AV-32H47SU AV-32H77SK AV-32H4SU Dimensions ( W × H × D ) 86.4cm × 58.7cm × 55.0cm 94.6cm × 56.1cm × 54.7cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.1cm × 54.7cm Mass 53.0kg 52.5kg 53.0kg TV RF System CCIR (B/G, D/K, I, L) CCIR (I) Colour System...

  • Page 4: 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 5 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 6: Specific Service Instructions

    (P-P= Peak to Peak, B-W= Blanking to white peak) [Pin assignment] 18 16 12 10 19 17 13 11 2.3 MAIN DIFFERENCE LIST Item AV-28H4BU AV-28H4SU AV-28H40SU AV-28H77SK ← ← Dimensions ( W × H × D ) 76.2cm × 52.8cm × 49.3cm 85.4cm × 50.8cm × 49.0cm ←...
  • Page 7 TECHNINAL INFORMATION 2.4.1 MAIN MI-COM (CPU) PIN FUNCTION Pin name Function Pin name Function Not used I/O Data bit for PP-RAM/SD-RAM Not used I/O Data bit for PP-RAM/SD-RAM Not used I/O Data bit for PP-RAM/SD-RAM Not used VSS33 P2.8 Remote control VDD33 3.3V P2.9...

  • Page 8: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE [AV-28H4BU, AV-28H4SU, AV-32H4BU, AV-32H4SU] 3.1.1 REMOVING THE REAR COVER 3.1.8 REMOVING THE SPEAKER (1) Unplug the power cord. • Remove the REAR COVER. (2) Remove the 13 screws [A] as shown in the Fig. 3.
  • Page 9 FRONT CABINET CRT SOCKET PWB FRONT CONTROL PWB SPEAKER GRIL POWER & DEF PWB CLAW CHASSIS BASE CONTROL BASE CN810K 100Hz PWB CN810F MAIN PWB AV TERMINAL CLAW BOARD AV JACK PWB SIDE CONTROL JACK ASS'Y REAR COVER POWER CORD Fig.3 (No.YA063)1-9...
  • Page 10 DISASSEMBLY PROCEDURE [AV-28H40SU, AV-28H77SK, AV-32H40SU, AV-32H47SU, AV-32H77SK] 3.2.1 REMOVING THE REAR COVER 3.2.8 CHECKING THE PW BOARD (1) Unplug the power cord. • To check the back side of the PW Board. (2) Remove the 13 screws [A] as shown in the Fig. 3. (1) Pull out the CHASSIS.
  • Page 11 ( x 2) FRONT CABINET ( x 4) CRT SOCKET SPEAKER SPEAKER ADAPTER FRONT CLAW ( x 3) CONTROL POWER & DEF. PWB CHASSIS BASE AV TERMINAL BOARD MAIN PWB MICOM CLAW AV SW PWB ( x 3) SIDE CONTROL JACK ASS'Y POWER CORD REAR COVER...
  • Page 12 REMOVING THE CRT NOTE: CRT CHANGE TABLE • Replacement of the CRT should be performed by 2 or more persons. • After removing the REAR COVER, CHASSIS etc., (1) Putting the CRT change table on soft cloth, the CRT APPROX. change table should also be covered with such soft cloth 35cm (shown in Fig.
  • Page 13 Verify what to set in the SERVICE MENU, and set whatever is necessary (Fig.1). FUNCTION -/+ Refer to the SERVICE ADJUSTMENT for setting. 3.4.2 SYSTEM CONSTANT SETTING Setting value AV-32H4BU AV-28H4BU Setting item Setting content AV-32H4SU AV-28H4SU AV-28H77SK AV-32H77SK AV-32H40SU...
  • Page 14 3.4.3 SETTINGS OF FACTORY SHIPMENT 3.4.3.1 BUTTON OPERATION 3.4.3.2 REMOTE CONTROL DIRECT OPERATION Setting item Setting position Setting item Setting position POWER CHANNEL CHANNEL VOLUME VOLUME ZOOM PANORAMIC HYPER SOUND 3.4.3.3 REMOTE CONTROL MENU OPERATION (1) PICTURE SETTING (4) EXT SETTING Setting item Setting position Setting item...
  • Page 15 3.4.4 SERVICE MENU SETING ITEMS Setting item Setting value Setting item Setting value 1. IF 1. VCO 5. VSM PRESET BRIGHT/SOFT/STD COOL/WARM/NOMAL 2. ATT ON/OFF 1.CONT. 1.WDR R 2.BRIGHT 2.WDR G 3.SHARP 3.WDR B 4.COLOUR 5.HUE 2. V / C 1.RGB BLK 6.STATUS 1.SOFT...
  • Page 16 REPLACEMENT OF CHIP COMPONENT 3.5.1 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. 3.5.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.

  • Page 17: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION MEASURING INSTRUMENT AND FIXTURES (1) There are 2 ways of adjusting this TV : One is with the (1) DC voltmeter (or digital voltmeter) REMOTE CONTROL UNIT and the other is the (2) Oscilloscope conventional method using adjustment parts and (3) Signal generator (Pattern generator) components.
  • Page 18 ADJUSTMENT LOCATIONS 4.5.1 AV-28H4BU, AV-28H4SU, AV-32H4BU, AV-32H4SU FRONT CONTROL PWB FRONT POWER POWER SIDE CONTROL PWB D8801 IC8851 F8901 [POWER CORD] FRONT [SPEAKER] MAIN PWB POWER&DEF PWB CN003 IC701 MICOM / 100Hz CN004 TUNER AV JACK PWB CN001 CN005 1: TP-91(B1)
  • Page 19 4.5.2 AV-28H40SU, AV-28H77SK, AV-32H40SU, AV-32H47SU,AV-32H77SK FRONT CONTROL PWB SIDE CONTROL PWB POWER POWER FRONT D8801 IC8851 F8901 POWER CORD [SPEAKER] MAIN PWB FRONT POWER&DEF PWB CN003 IC701 MICOM / 100Hz CN004 TUNER AV JACK PWB CN001 CN005 1: TP-91(B1) 2: NC 3: X-ray1 4: X-ray2 CN002...
  • Page 20 BASIC OPERATION OF SERVICE MENU 4.6.1 TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the REMOTE CONTROL UNIT. 4.6.2 SERVICE MENU ITEMS With the SERVICE MENU, various adjustments can be made, and they are broadly classified in the following items of settings. 1.IF This mode adjusts the setting values of the IF circuit.
  • Page 21 4.6.4 SERVICE MENU FLOW CHART SERVICE MENU SERVICE MENU 1. IF 2. V/C 3. AUDIO 4. DEF 5. VSM PRESET 6. STATUS 8. SURROUND 9. SHIPPING (OFF) 0. BUS FREE 1-9 : SELECT : EXIT 4. DEF 1.IF(VCO) 1. V-SHIFT IF SERVICE MENU 2.
  • Page 22 INITIAL SETTING VALUE OF SERVICE MENU (1) Adjustment of the SERVICE MENU is made on the basis of the initial setting values. However, the new setting values which displays on the screen in its optimum condition may differ from the initial setting value. (2) Do not change the initial setting values of the items not listed in “ADJUSTMENTS PROCEDURE”.
  • Page 23 4.7.3 [5. VSM PRESET] Setting value Variable Item PICTURE MODE COLOUR TEMP. range BRIGHT STANDARD SOFT COOL NORMAL WARM 1.CONT -16~+16 2.BRIGHT -16~+16 3.SHARP -16~+16 4.COLOUR -16~+16 5.HUE -16~+16 1.WDR R -64~+64 2.WDR G -64~+64 3.WDR B -64~+64 4.7.4 [4. DEFLECTION] Initial setting value Variable Setting item...
  • Page 24 ADJUSTMENTS PROCEDURE 4.8.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument B1 POWER DC voltmeter X connector [2.V/C] (1) Receive the any broadcast. SUPPLY 1-pin:TP-91(B1) 1.RGB BLK (2) Select 2. V/C from the SERVICE MENU. check Remote 5-pin:TP-E (3) Select <...
  • Page 25 4.8.2 FOCUS Measuring Item Test point Adjustment part Description instrument FOCUS Signal FOCUS 1 VR (1) Receive the crosshatch signal. [32" MODELS] generator FOCUS 2 VR (2) Set the ZOOM mode to FULL. [In HVT] (3) By turning the FOCUS 2 VR, adjust the picture so that the A part vertical line may become thinnest (Fig.1) .
  • Page 26 4.8.3 DEFLECTION CIRCUIT There are 3 aspect modes ( 1.FULL, 2.PANORAMIC, 3.SUBTITLE) of the adjustment. Depending upon the kind of signals ( Vertical frequency 100Hz i / 60Hz p). 100Hz i is a signal that is output to a screen when a 50Hz signal is input to a television set. It is an interlace-scanned picture of 100Hz. •...
  • Page 27 Measuring Item Test point Adjustment part Description instrument H. POSITION Signal [4.DEF] (1) Receive the circle pattern signal. generator 3.H-CENT (2) Set the ZOOM mode to FULL. (3) Select 4.DEF from the SERVICE MENU. Remote (4) Select < 3.H-CENT >. control unit (5) Set the initial setting value of <...
  • Page 28 Measuring Item Test point Adjustment part Description instrument TRAPEZIUM Signal [4.DEF] (1) Receive the cross-hatch signal. generator 5.TRAPEZ (2) Set the ZOOM mode to FULL. (3) Select 4.DEF from the SERVICE MENU. Remote (4) Select < 5.TRAPEZ >. control unit (5) Set the initial setting value of <...
  • Page 29 Measuring Item Test point Adjustment part Description instrument Signal [4.DEF] • In case where there is a bow-shaped distortion of generator 12.BOW images on the screen. (1) Receive the cross-hatch signal. Remote (2) Set the ZOOM mode to FULL. control unit (3) Select 4.DEF from the SERVICE MENU.
  • Page 30 4.8.4 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal [2. V/C] (1) Receive a black and white signal (colour off). BALANCE generator 2.CUTOFF R (2) Set the ZOOM mode to FULL. 3.CUTOFF G (3) Set the PICTURE MODE to STD. Remote 4.CUTOFF B (4) Set the COLOUR TEMP to NORMAL.
  • Page 31 Measuring Item Test point Adjustment part Description instrument SUB COLOUR-1 Remote [2.V/C] [Method of adjustment without measuring instrument] control unit 10.COLOUR PAL COLOUR (PAL/SECAM/NTSC) (1) Receive PAL broadcast. (2) Set the ZOOM mode to FULL. (3) Set the PICTURE MODE to STD. (4) Select 2.V/C from the SERVICE MENU.
  • Page 32 (3) Adjust SECAM COLOUR and bring the value of [PAL COLOUR VOLTAGE SETTING] (A) in the illustration to the values as shown given Voltage setting billow (Voltage difference between white (W) and blue (B)). AV-28H4BU AV-28H4SU (4) Press the [MENU] key and memorize the set AV-28H40SU AV-28H77SK value.
  • Page 33 Measuring Item Test point Adjustment part Description instrument SUB HUE-1 Remote [2.V/C] [Method of adjustment without measuring instrument] control unit 11.HUE NTSC 3.58 (1) Input the NTSC 3.58MHz signal from the EXT terminal. (2) Set the ZOOM mode to FULL. (3) Set the PICTURE MODE to STD.
  • Page 34 4.8.5 VSM PRESET SETTING Measuring Item Test point Adjustment part Description instrument VSM PRESET Remote [5.VSM PRESET] (1) Set the ZOOM mode to FULL. control unit (BRIGHT/STD/SOFT) (2) Select 5.VSM PRESET from the SERVICE MENU. 1. CONT. (3) Press the [MENU] key, and set the PICTURE MODE 2.

  • Page 35: Trouble Shooting

    SECTION 5 TROUBLE SHOOTING This service manual does not describe TROUBLE SHOOTING. (No.YA063)1-35...
  • Page 36 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.YA063) Printed in Japan...

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