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JVC AV-20F475/S Service Manual
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JVC AV-20F475/S Service Manual

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SERVICE MANUAL
4
2004
YA052
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
COLOR TELEVISION
AV-20F475
AV-N21F45

TABLE OF CONTENTS

COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
,
/S
/S
BASIC CHASSIS
FJ2
No.YA052
2004/4

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Summary of Contents for JVC AV-20F475/S

  • Page 1: Table Of Contents

    SERVICE MANUAL COLOR TELEVISION YA052 2004 AV-20F475 AV-N21F45 BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 66.7cm × 47.7cm × 50.5cm (26-1/4" × 18-13/16" × 19-7/8") Mass 25kg (55lbs) TV RF System CCIR(M) Color System NTSC Sound System BTSC (Multi Channel Sound) TV Receiving Channels VHF Low 02ch~06ch : 54MHz~88MHz and Frequency...

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (1) The design of this product contains special hardware, many replaced. Always manufacturer's replacement circuits and components specially for safety purposes. For components. continued protection, no changes should be made to the original (10) Isolation Check (Safety for Electrical Shock Hazard) design unless authorized in writing by the manufacturer.

  • Page 4: Specific Service Instructions

    The world clock feature provides time differences for some of Since the component signal input terminal is equipped, it the major cities around the world in real time. reappears direct without deteriorating the signal from DVD. MAIN DIFFERENCE LIST Item AV-20F475/S AV-N21F45/S DESTINATION USA, CANADA MEXICO, PANAMA V-CHIP...
  • Page 5 TECHNICAL INFORMATION 2.3.1 SYSTEM BLOCK DIAGRAM REMOCON REMOCON IC101 RECEIVER A F T 1 IC201 IF DET MAIN MI-COM / VIDEO PROCESS / IC702 S C L 1 DEF. PROCESS MEMORY S D A 1 SCL0 SDA0 S C L 0 S D A 0 S C L 0 S D A 0...

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER 3.1.4 CHECKING THE MAIN PWB (1) Unplug the power plug. To check the PW Board from back side. (2) Remove the 7 screws [A] as shown in the Fig.1. (1) Pull out the MAIN PWB (refer to REMOVING THE MAIN (3) Remove the 4 screws [B] as shown in the Fig.1.
  • Page 7 FRONT ABINET SPEAKER SPA ER SPEAKER HOLDER RT SO KET PWB MAIN PWB (PWB STOPPER) REAR OVER POWER ORD Fig.1 (No.YA052)1-7...
  • Page 8 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 MEMORY IC REPLACEMENT PROCEDURE 3.2.2 SERVICE MODE SETTING ITEMS 1.
  • Page 9 3.2.3 SETTINGS OF FACTORY SHIPMENT 3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION Setting item Setting position Setting item Setting position POWER INPUT CHANNEL CH-02 CHANNEL CH-02 VOLUME VOLUME MUTING DISPLAY OFF TIMER VIDEO STATUS DYNAMIC ASPECT HYPER SORROUND 3.2.3.3 REMOTE CONTROL MENU OPERATION (1) PICTURE ADJUST (3) CLOCK / TIMERS...
  • Page 10 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 11: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION MEASURING INSTRUMENT AND FIXTURES (1) There are 2 ways of adjusting this TV : One is with the • DC voltmeter (or digital voltmeter) REMOTE CONTROL UNIT and the other is the • Oscilloscope conventional method using adjustment parts and •...

  • Page 12: Main Pwb

    ADJUSTMENT LOCATIONS CRT SOCKET PWB (SOLDER SIDE) TP-B TP-E CRT EARTH (BRAIDED ASS'Y) FRONT MAIN PWB MEMORY IC SPEAKER F901 IC702 FUSE IC201 POWER CORD DEG. COIL TP-E(GND) T111 IC421 1: X-RAY R927 DOWN 2: GND S401 3: X-RAY V CENTER SW TP-91(B1) IC851 T521...
  • Page 13 BASIC OPERATION OF SERVICE MODE SUB MENU 7.LOW LIGHT SERVICE MENU 1.V/C(S) 2.DEF(D) 3.SOUND(A) 4.OTHERS(F) 5.3L Y/C(LYC) 7.LOW LIGHT 8.HIGH LIGHT 9.VCO 11.I2C BUS 12.SYSTEM(SYS) SELECT BY EXIT BY EXIT OPERATE BY BRIGHT 1.V/C(S) 8.HIGH LIGHT 4 : 3 BRIGHT 2.DEF(D) 9.VCO 4 : 3...
  • Page 14 4.6.1 TOOL OF SERVICE MODE OPERATION Operate the SERVICE MODE with the REMOTE CONTROL UNIT. 4.6.2 SERVICE MODE ITEMS In general, basic setting (adjustments) items or verifications are performed in the SERVICE MODE. 1. V/C (S) This sets the setting values of the VIDEO circuit. 2.
  • Page 15 4.6.6 SERVICE MODE SETTING 1. V/C(S), 2. DEF(D) 7. LOW LIGHT • Press [CH+] / [CH-] key The settings for LOW LIGHT is described in the WHITE For scrolling up/down the adjustment item. BALANCE page of ADJUSTMENT PROCEDURE. • Press [VOL+] / [VOL-] key NOTE: For scrolling up/down the data values.
  • Page 16 INITIAL SETTING VALUE OF SERVICE MODE (1) Adjustment of the SERVICE MODE is made on the basis of the initial setting values ; however, the new setting values which set the screen in its optimum condition may differ from the initial setting. (2) Do not change the initial setting values of the setting items NOT LISTED IN ADJUSTMENT PROCEDURE.
  • Page 17 Initial setting value Setting Variable item range EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT) ASY SHRP 0 ~ 7 BPF FØ 0 ~ 1 KILR OFF 0 ~ 1 KILR SEN 0 ~ 1 Setting Variable Initial setting value item range RGB MUTE 0 ~ 1 BLUE B...
  • Page 18 4.7.2 [2. DEF (D)] Initial setting value Setting Variable EXTERNAL item range 16:9 V FREQ 0 ~ 3 AFC GAIN 0 ~ 3 H POSI 0 ~ 31 H POSI+- -128 ~ +127 V PHASE 0 ~ 7 V PH+- -128 ~ +127 V SIZE 0 ~ 127...
  • Page 19 0 ~ 1 SYS19 VOL MUTE 0 ~ 1 SYS20 VCHIP 0 ~ 1 SYS21 VCHIP CA 0 ~ 1 SYS22 CCD 0 ~ 1 SYS23 HYPSCAN 0 ~ 1 SYS24 JVC LOGO 0 ~ 1 SYS25 PANORAMA 0 ~ 1 (No.YA052)1-19...
  • Page 20 ADJUSTMENT PROCEDURE 4.8.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument B1 VOLTAGE Signal TP-91(R927) (1) Receive the black and white signal. (color off) generator TP-E (IC421 (2) Connect the DC voltmeter to the TP-E and TP-91. Heatsink) (3) Confirm that the voltage is DC134V±2V.
  • Page 21 4.8.4 DEFLECTION CIRCUIT • The setting (adjustment) using the remote control unit is made on the basis of the initial setting values. • The setting values which adjust the screen to the optimum condition can be different from the initial setting values. Measuring Item Test point...
  • Page 22 Measuring Item Test point Adjustment part Description instrument H. SIZE / Signal [2.DEF (D)] • V. SIZE / V. POSITION adjustment should be finished. H. POSITION / generator D03: H POSI (1) Receive a cross-hatch signal. SIDE PIN D15: H SIZE (2) Select 2.DEF(D) from the SERVICE MODE.
  • Page 23 4.8.5 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal [1.V/C (S)] (1) Receive the black and white signal ( color off ). BALANCE generator S01: BRIGHT (2) Set the VIDEO STATUS to STANDARD. (LOW LIGHT) S11: R CUTOFF (3) Set the COLOR TEMPERATURE to LOW.
  • Page 24 Measuring Item Test point Adjustment part Description instrument WHITE Signal [1.V/C (S)] (1) Receive the black-and-white signal (color off). BALANCE generator S14: R DRIVE (2) Set the VIDEO STATUS to STANDARD. (HIGH LIGHT) S15: B DRIVE (3) Set the COLOR TEMPERATURE to LOW. Remote (4) Select the 1.V/C (S) from the SERVICE MODE.
  • Page 25 4.8.6 MTS CIRCUIT Measuring Item Test point Adjustment part Description instrument MTS INPUT Remote [3.SOUND (A)] (1) Receive any broadcast. LEVEL control unit A01: IN LEVEL (2) Select the 3.SOUND (A) from the SERVICE MODE. (3) Select the < A01 > (IN LEVEL). (4) Set the initial setting value of the <...

  • Page 26: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. 1-26 (No.YA052)
  • Page 27 JVC SERVICE & ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP. www.jvcservice.com(US Only) JVC CANADA INC. Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 (416)293-1311 (No.YA052) Printed in Japan...

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Av-n21f45/s