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JVC AV-27F476 Service Manual

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SERVICE MANUAL
2
2005
YA243
AV-27F476
AV-32F476
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
COLOR TELEVISION
/R
/Y

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
, AV-27F476
, AV-32F476
,
/S
/Z
BASIC CHASSIS
GJ5
No.YA243
2005/2

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  Summary of Contents for JVC AV-27F476

  • Page 1: Table Of Contents

    SERVICE MANUAL COLOR TELEVISION YA243 2005 AV-27F476 , AV-27F476 AV-32F476 , AV-32F476 BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Contents Items AV-27F476 AV-32F476 Dimensions (W × H × D) 82.9 cm × 59.3 cm × 51.9 cm 93.9 cm × 68.5 cm × 57cm (32-3/4" × 23-3/8" × 20-1/2") (37" × 27" × 22-1/2") Mass 43.0 kg (94.6 Ibs) 64.0 kg (140.8 Ibs)
  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (1) The design of this product contains special hardware, many (10) Isolation Check (Safety for Electrical Shock Hazard) circuits and components specially for safety purposes. For After re-assembling the product, always perform an isolation continued protection, no changes should be made to the original check on the exposed metal parts of the cabinet (antenna design unless authorized in writing by the manufacturer.
  • Page 4: Specific Service Instructions

    Creates a deep, three-dimensional sound effect by channeling the audio through the TV's front-firing speakers. V-CHIP Since the V-CHIP is built in, it can choose, view and listen to a healthy program. MAIN DIFFERENCE LIST Item AV-27F476/R AV-27F476/S AV-32F476/Y AV-32F476/Z PICTURE TUBE (ITC) A68ELH021X201 A68QCP693X003...
  • Page 5 TECHNICAL INFORMATION 2.4.1 MAIN MI-COM (CPU) PIN FUNCTION Pin name I/O Function Pin name Function MTS_ADJ Not used 29 YC_GND AFT1 AFT voltage for tuner (Tuning frequency control) 30 V1_IN Not used Key scan for front control [No signal: H] 31 ABCL Current for automatic beam (brightness)/contrast limit uP_DVss...
  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER 3.1.7 CHECKING THE CHASSIS (1) Disconnect the power plug. To check the PW Board from back side. (2) Remove the 11 screws [A]. (1) Pull out the CHASSIS (refer to REMOVING THE CHASSIS). (3) Withdraw the REAR COVER backward.
  • Page 7 FRONT CABINET SPEAKER CRT SOCKET PWB SPEAKER HOLDER FRONT CONTROL PWB MAIN PWB Claw LED & POWER SW PWB Claw POWER CORD AV TERMINAL AV SELECTOR PWB BOARD REAR COVER Fig.1 (No.YA243)1-7...
  • Page 8 3.1.9 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 9 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 10 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 SLEEP TIMER THEATER PRO VIDEO STATUS DYNAMIC ASPECT 4 : 3 HYPER SURROND OFF SOUND 3.2.3.3...
  • Page 11 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 12: 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 13: Main Pwb

    ADJUSTMENT LOCATIONS FRONT FRONT LED & POWER SW PWB FRONT CONTROL PWB CN6006 POWER LED POWER SW CN6007 FRONT POWER CORD SPEAKER MAIN PWB CN007 DEG COIL F901 MEMORY IC CN004 IC702 CN5006 IC201 CN001 DEF. YOKE TUNER AV SELECTOR V CENTER SW V CENTER SW S421...
  • Page 14 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 [Fixed value] 4 : 3...
  • Page 15 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 16 4.6.6 SERVICE MODE SETTING 1. V/C, 2. DEF 7. LOW LIGHT • Press [CH+] / [CH-] key The settings for WHITE BALANCE(LOW LIGHT) control For scrolling up/down the adjustment item. circuit. • Press [VOL+] / [VOL-] key NOTE: For scrolling up/down the data values. The setting value will be stored automatically when release NOTE: the REMOTE CONTROL UNIT keys.
  • Page 17 (2) Do not change the initial setting values of the setting items NOT LISTED IN ADJUSTMENT PROCEDURE. (3) --- : This mark described in each table shows "Cannot adjust it." 4.7.1 [1.V/C(S)] Initial setting value AV-27F476/R AV-27F476/S Setting Variable EXTERNAL...
  • Page 18 -32 - +32 ±0 COLOR+- -32 - +32 ±0 TINT+- -32 - +32 ±0 DETAIL+- -32 - +32 ±0 Initial setting value AV-27F476/R AV-27F476/S Setting Variable item range RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT) STANDARD THEATER STANDARD THEATER...
  • Page 19 0 - 7 BPF FO 0 - 1 KILR OFF 0 - 1 KILR SEN 0 - 1 Initial setting value Setting Variable AV-27F476/R AV-32F476/Y item range AV-27F476/S AV-32F476/Z RGB MUTE 0 - 1 BLUE B 0 - 1 VIDEO SW...
  • Page 20 4.7.2 [2. DEF (D)] Initial setting value AV-27F476/R AV-32F476/Y AV-32F476/Z Setting Variable AV-27F476/S item range EXTERNAL EXTERNAL EXTERNAL 4 : 3 16 : 9 4 : 3 4 : 3 16 : 9 4 : 3 4 : 3 16 : 9...
  • Page 21 -128 - +127 ±0 4.7.4 [4. OTHERS(F)] [Do Not adjust : All fixed] Initial setting value Initial setting value Setting Variable item range AV-27F476/R AV-27F476/S AV-32F476/Y AV-32F476/Z OSD POSI 0 - 255 OSD FREQ 0 - 255 CCD POSI 0 - 255...
  • Page 22 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 1-22 (No.YA243)
  • Page 23 ADJUSTMENT PROCEDURE 4.8.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument B1 VOLTAGE DC voltmeter S1 Connector (1) Receive the black and white signal. (color off) 1-pin : TP-E (2) Connect the DC voltmeter to the 1-pin and 5-pin of 5-pin : TP-91B S1 connector.
  • Page 24 Measuring Item Test point Adjustment part Description instrument V. SIZE / Signal [2.DEF (D)] • V. SIZE / V. POSITION (4:3) adjustment should be V. POSITION generator D08: V. SIZE+- finished. (16:9) D14: V. LIN+- (1) Receive a black and white signal (color off). Remote (2) Select 16:9 mode.
  • Page 25 4.8.4 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) Select the 1.V/C (S) from the SERVICE MODE. (LOW LIGHT) S11: R CUTOFF (3) Confirm the initial setting value of <...
  • Page 26 Measuring Item Test point Adjustment part Description instrument Remote [1.V/C (S)] (1) Receive any broadcast. CONTRAST control unit S02: PICTURE (2) Select the 1.V/C (S) from the SERVICE MODE. (3) Select < S02 > (PICTURE). (4) Set the initial setting value of < S02 >. (5) If the contrast is not the best with the initial setting value, make fine adjustment of the <...
  • Page 27: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.YA243)1-27...
  • Page 28 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.YA243) Printed in Japan...

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Av-32f476