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JVC AV-28R4SK Service Manual

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SERVICE MANUAL
3
2004
YA060
AV-28R4SK, AV-28T4BK, AV-28T4SK,
AV-28T4SP, AV-28T4BR, AV-28T4SR,
AV-28T77SK, AV-32R4SK, AV-32T4SK,
AV-32T4SP, AV-32T4SR, AV-32T77SK
1
2
3
4
5
6
7
8
9
0
AV
MENU
P
TV
OK
P
TV
AV-28R4SK, AV-28T4BK, AV-28T4SK,
AV-28T4SP, AV-28T4BR, AV-28T4SR,
AV-32R4SK, AV-32T4SK, AV-32T4SP,
AV-32T4SR
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5
TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
COLOUR TELEVISION

TABLE OF CONTENTS

COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
BASIC CHASSIS
JW
AV-28T77SK
AV-32T77SK
No.YA060
2004/3

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Summary of Contents for JVC AV-28R4SK

  • Page 1: Table Of Contents

    SERVICE MANUAL COLOUR TELEVISION YA060 2004 AV-28R4SK, AV-28T4BK, AV-28T4SK, AV-28T4SP, AV-28T4BR, AV-28T4SR, AV-28T77SK, AV-32R4SK, AV-32T4SK, AV-32T4SP, AV-32T4SR, AV-32T77SK BASIC CHASSIS MENU AV-28R4SK, AV-28T4BK, AV-28T4SK, AV-28T77SK AV-28T4SP, AV-28T4BR, AV-28T4SR, AV-32T77SK AV-32R4SK, AV-32T4SK, AV-32T4SP, AV-32T4SR TABLE OF CONTENTS PRECAUTION............... . . 1-4 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Contents AV-28T4SK AV-28T4BK Items AV-28R4SK AV-28T4SR AV-28T4SP AV-28T4BR AV-28T77SK Dimensions ( W × H × D ) 85.4cm × 50.8cm × 49.7cm 85.4cm × 50.7cm × 49.7cm 85.4cm × 50.8cm × 49.3cm 85.4cm × 50.7cm × 48.9cm [AV-28T77SK] Mass 42.0kg...
  • Page 3 Contents AV-32T4SK Items AV-32R4SK AV-32T4SR AV-32T4SP AV-32T77SK Dimensions ( W × H × D ) 94.8cm × 56.2cm × 55.4cm 94.8cm × 56.2cm × 55.4cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.2cm × 54.7cm [AV-32T77SK] Mass 56.0kg 56.0kg 53.0kg 53.0kg [AV-32T77SK] TV RF System CCIR ( I )

  • 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

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES • New chassis design enable use of an interactive on screen • Because this TV unit corresponds to multiplex broadcast, control. users can enjoy music programs and sporting events with live • The TELETEXT SYSTEM has a built-in FASTEXT (UK realism.
  • Page 7 2.3 MAIN DIFFERENCE LIST Item AV-28R4SK AV-28T4SK AV-28T4BK AV-28T4SR AV-28T4BR AV-28T77SK AV-28T4SP ← ← ← ← CABINET TYPE ← CABINET COLOUR Silver Black Silver Black Silver Silver DESTINATION England England England Ireland Ireland England Germany Belgium France Switzerand Austria Italy...
  • Page 8 TECHNINAL INFORMATION 2.4.1 MAIN MI-COM (CPU) PIN FUNCTION Pin name Function Pin name Function VssP2 65 SVM SVM output VssC4 66 FbiSo I/O Flyback input/SC output V1.8C4 1.8VD 67 Hout H output V3.3A3 3.3V 68 VssComb GND for comb filter VrefP_Sdac 3.3V 69 V5Comb...

  • Page 9: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE The illustration of Fig.5 is explained about AV-28R4SK/AV-32R4SK. In case of AV-28T Series or AV-32T Series MODELS, you disassemble in the same procedure using Fig.6. 3.1.1 REMOVING THE REAR COVER 3.1.8 CHECKING THE PW BOARD (1) Unplug the power plug.
  • Page 10 3.1.11 REMOVING THE SUB WOOFER UNIT [AV-28R4SK / AV-32R4SK] (1) Remove the 15 screws [L], remove the SP BOX B. (2) Remove the 4 screws [M], remove the SPEAKER. (3) Remove the 3 screws [N], remove BASS INT. DUCT. CAUTION SP BOX B •...
  • Page 11 3.1.12 EXPLODED VIEW [AV-28R4SK and AV-32R4SK] FRONT CABINET MAIN SPEAKER HOLDER MAIN SPEAKER CRT SOCKET PWB FRONT CONTOL PWB POWER & DEF. PWB CLAW MAIN CHASSIS AV JACK PWB CONTROL SIDE BASE CONTROL AV TERMINAL BOARD CLAW CENTER MAIN PWB...
  • Page 12 3.1.13 EXPLODED VIEW [AV-28T Series and AV-32T Series] FRONT CABINET MAIN SPEAKER HOLDER CRT SOCKET PWB MAIN SPEAKER FRONT CONTOL PWB CLAW POWER & DEF.PWB AV JACK PWB SIDE CONTROL CONTROL BASE AV TERMINAL BOAD CLAW MAIN PWB SIDE CONTROL JACK ASSEMBLY POWER CORD REAR COVER...
  • Page 13 3.1.14 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.
  • Page 14 Verify what to set in the SERVICE MENU, and set whatever is FUNCTION -/+ necessary (Fig.1). Refer to the SERVICE ADJUSTMENT for setting. 3.2.2 SYSTEM CONSTANT SETTING Setting data Address AV-28T4SK AV-28T4SR AV-28R4SK AV-28T4SP AV-28T77SK AV-32R4SK AV-32T4SK AV-32T4SP AV-32T4SR AV-32T77SK AV-28T4BK AV-28T4BR 1-14 (No.YA060)
  • Page 15 MIDDLE BASS Centre TREBLE Centre BALANCE Centre HYPER SOUND DOLBY VIRTUAL [AV-28T77SK/AV-32T77SK] TV SPEAKER [AV-28R4SK/AV-32R4SK] SUROUND MODE [AV-28R4SK/AV-32R4SK] DOLBY TV SPEAKER L / C / R PRO LOGIC II LEFT MAX CENTRE MAX RIGHT MAX LS MAX RS MAX WOOFER MAX DISTANCE 0 (No.YA060)1-15...
  • Page 16 3.2.4 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. DELAY POINT 1.BRIGHT 1.WDR R 2.CONT. 2.WDR G 3.COLOUR 3.WDR B 4.SHARP 5.HUE 2. V / C 1.SCREEN 6.VPS 2.CUTOFF R / G...
  • Page 17 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 18: 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 components.
  • Page 19 F8901 LF8901 POWER CORD SIDE CONTROL PWB FRONT POWER&DEF PWB SPEAKER MAIN PWB IC941 (Only AV-28R4SK CN008 / AV-32R4SK) WOOFER [AV-28R4SK / AV-32R4SK] CN004 DOLBY PWB [AV-28R4SK / AV-32R4SK] CENTER TUNER SPEAKER CN001 CN003 1 B1 AV JACK IC702 2 N.C.
  • 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. VPS 7. SHIPPING (OFF) 4. DEF 1.IF 1.VCO IF SERVICE MENU VCO (CW) ** , ** MHz 1. V-SHIFT FULL 50Hz TOO HIGH...
  • 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 “ADJUSTMENT PROCEDURE”.
  • Page 23 4.7.3 [4. DEF] Initial setting value Variable Setting item FULL PANORAMIC SUBTITLE 14:9 ZOOM REGULAR COMPRESS range 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 1.V-SHIFT -32~+31 ±0 ±0 ±0 ±0 ±0 ±0 ±0 ±0 ±0 2.V-SLOPE -32~+31 ±0...
  • Page 24 ADJUSTMENT PROCEDURE 4.8.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument B1 POWER Signal X connector [2.V/C] (1) Receive the any broadcast. SUPPLY generator TP-91(B1) 12.RGB BLK (2) Select 2. V/C from the SERVICE MENU. check TP-E (3) Select < 12. RGB BLK >. DC voltmeter [POWER DEF (4) Press the [FUNCTION + ( )] key to find the cut off...
  • 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 6 aspect modes ( 1.FULL, 2.PANORAMIC, 3.SUBTITLE, 4.14:9 ZOOM 5.REGULAR 6.COMPRESS) of the adjustment. Depending upon the kind of signals. NOTE : • At first the adjustment in 50Hz FULL mode should be done, then the data for the other aspect mode is corrected in the respective value at the same time.
  • Page 27 Measuring Item Test point Adjustment part Description instrument H. POSITION Signal [4.DEF] (1) Receive the circle pattern signal. generator 4.H-CENT (2) Set the ZOOM mode to FULL. (3) Select 4.DEF from the SERVICE MENU. Remote (4) Select < 4.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 6.TRAPEZ (2) Set the ZOOM mode to FULL. (3) Select 4.DEF from the SERVICE MENU. Remote (4) Select < 6.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 11.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 the black and white signal (colour off). (2) Set the ZOOM mode to FULL. BALANCE generator 2.CUTOFF R / G (3) Set the PICTURE mode to STD. 3.WDR R / G / B (4) Set the COLURTEMP.
  • Page 31 Measuring Item Test point Adjustment part Description instrument SUB COLOUR-2 Signal TP-47B [2.V/C] [Method of adjustment using measuring instrument] generator TP-E 6.COLOUR PAL COLOUR [CRT SOCKET (PAL/SECAM/NTSC) (1) Receive the PAL full field colour bar signal (75% Oscilloscope PWB ] white).
  • Page 32 Measuring Item Test point Adjustment part Description instrument SUB HUE-2 Signal TP-47B [2.V/C] [Method of adjustment using measuring instrument] generator TP-E 7.HUE NTSC 3.58 HUE [CRT SOCKET (1) Input the NTSC 3.58MHz signal (full field colour Oscilloscope PWB] bar with 75% white) from the EXT terminal. (2) Set the ZOOM mode to FULL.
  • Page 33 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. BRIGHT (3) Press the [MENU] key, and set the PICTURE MODE 2.

  • Page 34: Trouble Shooting

    SECTION 5 TROUBLE SHOOTING This service manual does not describe TROUBLE SHOOTING. 1-34 (No.YA060)
  • Page 35 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.YA060) Printed in Japan...

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