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JVC AV-21YT15 Service Manual
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JVC AV-21YT15 Service Manual

JVC AV-21YT15 Service Manual

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SERVICE MANUAL
7
2005
YA266
AV-21YT15
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
FLAT COLOR TELEVISION
[AV-21YT15
]
/Z

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
, AV-21VT35
/Z
[AV-21VT35
/Z
BASIC CHASSIS
CW
]
/Z
No.YA266
2005/7

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Summary of Contents for JVC AV-21YT15

  • Page 1: Table Of Contents

    SERVICE MANUAL FLAT COLOR TELEVISION YA266 2005 AV-21YT15 , AV-21VT35 BASIC CHASSIS [AV-21YT15 [AV-21VT35 TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Contents Items AV-21YT15/Z AV-21VT35/Z Dimensions (W × H × D) 64.9cm × 47.05cm × 47.75cm 64.9cm × 47.8cm × 47.35cm Mass 21kg 25kg TV RF System M / N Color System TV Mode NTSC3.58 Video Mode PAL / NTSC3.58 / NTSC4.43...

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (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 4: Specific Service Instructions

    In accordance with the brightness in a room, the brightness and/or contrast of the picture can be adjusted automatically to make the optimum picture which is easy on the eye. • Built-in OFF TIMER & RETURN +. MAIN DIFFERENCE LIST Items AV-21YT15/Z AV-21VT35/Z BASS BLASTER None BASS BLASTER UNIT...
  • Page 5 MAIN CPU [MAIN PWB : IC701] PIN FUNCTION Pin no. Pin name Remark Pin no. Pin name Remark CVBSO/PIP O CVBS / PIP output VssP2 O Scan velocity modulation output VssC4 FbiSo Flyback input/sandcastle output V1.8C4 1.8V (Digital) Hout O Horizontal output V3.3A3 3.3V VssComb...

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE [AV-21YT15/Z] DISASSEMBLY PROCEDURE [AV-21VT35/Z] 3.1.1 REMOVING THE REAR COVER 3.2.1 REMOVING THE TWIN PORT BASS BLASTER UNIT • Unplug the power cord. • Unplug the power supply cord. (1) Remove the 8 screws [A], 1 screw [B] and 2 screws [C] as (1) Disconnect the TWIN PORT BASS BLASTER UNIT’s cord...
  • Page 7 PICTURE TUBE FRONT CABINET (X4) SPEAKER MAIN PWB (CRT SOCKET PWB) (X4) MAIN PWB SPEAKER REAR COVER (X8) (X2) Fig.1 (No.YA266)1-7...
  • Page 8 PICTURE TUBE (X2) FRONT CABINET SPEAKER MAIN PWB (CRT SOCKET PWB) (X2) SPEAKER MAIN PWB TWIN PORT BASS BLASTER UNIT (X6) REAR COVER (X2) (X4) Fig.2 1-8 (No.YA266)
  • Page 9 REPLACEMENT OF MEMORY IC 3.3.1 MEMORY IC This TV uses the following memory IC. SERVICE MENU Memory IC: IC702 on MAIN PWB The memory IC memorizes data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure SERVICE MENU to use the same type IC written with the initial values of data.
  • Page 10 3.3.3 FACTORY SETTING VALUE SETTING OF SYSTEM CONSTANT SET Setting value Setting item Setting content AV-21YT15/Z AV-21VT35/Z TAIWAN OTHERS SYSTEM OTHERS COMB TILT SUPER BASS STEREO MONO SOUND STEREO BLUE BACK MUTE ECO SENSOR SURROUND PICTURE BOOSTER COMPONENT S INPUT Table 1 1-10 (No.YA266)
  • Page 11 SETTING OF BASIC FUNCTIONS SERVICE MENU SETTING ITEMS Setting item Setting value Setting item Setting value POWER 1. IF 1. VCO 2. DELAY POINT SUB POWER 2. V/C 1. SCREEN VOLUME 2. CUTOFF(B/G) COLOR SYSTEM NTSC 3.58 3. WDR(R/G/B) 4. BRIGHT(TV/VDO 1/2/3) SOUND SYSTEM 5.
  • Page 12 REPLACEMENT OF CHIP COMPONENT 3.4.1 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. 3.4.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.

  • Page 13: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION (1) You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment equipment and parts as given below. (2) Adjustment with the remote control unit is made on the basis of the initial setting values, however, the new setting values used for setting the screen to its optimum condition may differ from the initial settings.
  • Page 14 ADJUSTMENT LOCATIONS MAIN PWB ASS'Y S804 S802 J808 J807 J806 J809 S805 S803 S801 FRONT POWER SW S901 CN00S POWER CORD IC702 DEG COIL IC701 YOKE J801 J802 J803 J804 CN00C CN00C CN00X TU001 UPPER : FOCUS 1. 5V 1. B1 2.
  • Page 15 BASIC OPERATION IN SERVICE MENU Operate the SERVICE MENU with the remote control unit. 4.6.1 SERVICE MENU ITEMS With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings: 1. IF For entering/adjusting the setting values (adjustment values) of the IF circuit.
  • Page 16 4.6.3 SERVICE MENU FLOW CHART 1. IF SERVICE MENU SERVICE MENU IF SERVICE MENU 1. IF 2. V/C VCO (CW) ***** 3. AUDIO 4. DEF TOO HIGH 5. VSM W/B 6. STATUS 1. VCO ABOVE REFERENCE 7. PLUG & PLAY (ON) JUST REFERENCE 2.
  • Page 17 ADJUSTMENT PROCEDURE 4.7.1 B1 VOLTAGE Measuring Item Test point Adjustment part Description instrument B1 VOLTAGE Signal B1 (pin 1) (1) Receive a black and white signal. check generator GND (pin 5) (2) Connect a DC voltmeter between B1 and GND [CN00X (between pins 1 and 5 of the connector CN00X).
  • Page 18 • Do not change the initial setting values of the setting (adjustment) items not listed in "ADJUSTMENT PROCEDURE". • The initial setting values in parenthesis ( ) are fixed offset values, needing no further adjustment. [AV-21YT15/Z] Initial setting value Adjustment item...
  • Page 19 Measuring Item Test point Adjustment part Description instrument WHITE Signal [2. V/C] Note: • Set PICTURE MODE (VSM) to "BRIGHT". BALANCE generator 2. CUTOFF (B) (Low light) 2. CUTOFF (G) - COMPOSITE WHITE BALANCE - adjustment Remote (1) Receive a PAL black and white signal (color off). control unit SCREEN VR (2) Select 2.
  • Page 20 Measuring Item Test point Adjustment part Description instrument SUB BRIGHT Remote [2. V/C] Notes: adjustment control unit 4. BRIGHT • Proceed to the following adjustment after having completed the WHITE BALANCE (Low light) and WHITE BALANCE (High light) adjustment. • Set PICTURE MODE (VSM) to "BRIGHT". (1) Receive a broadcast.
  • Page 21 (2) Press the [COLOR SYSTEM] key to select the NTSC 3.58 color system. (3) Set the initial setting value of NTSC 3.58 COLOR. Adjust NTSC 3.58 COLOR to set the value (A) in the figure to +4V [AV-21YT15/Z] or +5V [AV-21VT35/Z]. SUB TINT 1 Signal [2. V/C]...
  • Page 22 - NTSC 4.43 TINT - When adjustment is done for NTSC 3.58 TINT, appropriate values are automatically set for NTSC 4.43 TINT. 4.7.5 AUDIO SETTING This submenu is for display only, no adjustment is required. [AV-21YT15/Z] Function Item 100Hz 300Hz...
  • Page 23 • When performing deflection circuit adjustment, adjusts PAL signal (fv: 50 Hz) in 4:3 mode and 16:9 mode respectively, and adjust the NTSC signal (fv: 60 Hz) similarly. Note: Proceed to the following adjustment after having completed the adjustments of SUB BRIGHT and SUB PICTURE. 4. DEF [AV-21YT15/Z] Variable range Initial setting value Adjustment item Others...
  • Page 24 COMPRESS: OFF (4:3) Measuring Item Test point Adjustment part Description instrument V. SLOPE Signal [4. DEF] - PAL V. SLOPE - adjustment generator 2. V-SLOPE (1) Receive a PAL circle pattern signal of vertical frequency 50Hz. Remote (2) Select 4. DEF from the SERVICE MENU. control unit (3) Select 2.
  • Page 25 Measuring Item Test point Adjustment part Description instrument H. POSITION Signal [4. DEF] - PAL H. POSITION - adjustment generator 4. H-CENT (1) Receive a PAL circle pattern signal. (2) Select 4. H-CENT. Remote (3) Set the initial setting value of 4. H-CENT. control unit (4) Adjust 4.
  • Page 26 Measuring Item Test point Adjustment part Description instrument H. BOW Signal [4.DEF] - PAL H. BOW - adjustment generator 11. BOW (1) Receive a PAL crosshatch signal. (2) Select 11. BOW. Remote (3) Set the initial setting value of 11. BOW. control unit (4) Adjust 11.
  • Page 27 VIDEO - 2 SET: COMPONENT Measuring Item Test point Adjustment part Description instrument H. POSITION Signal [4. DEF] (1) Receive a PAL circle pattern signal to VIDEO-2 adjustment generator 4. H-CENT component terminal. (2) Select VIDEO-2 SET from the MENU and set Remote VIDEO-2 SET to COMPONENT.
  • Page 28 4.7.8 PURITY AND CONVERGENCE PURITY ADJUSTMENT Note: The final adjustment of CONVERGENCE must be done after WEDGE DEFLECTION the FOCUS adjustment. (CONVERGENCE is changed by YOKE FOCUS adjustment.) When makes difference by FOCUS adjustment, should be reconfirming PURITY adjustment. (1) Demagnetize CRT with the demagnetizer. P / C (2) Loosen the retainer screw of the deflection yoke.
  • Page 29 STATIC CONVERGENCE ADJUSTMENT (1) Input a crosshatch signal. (2) Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig.1) and turn them (FRONT VIEW) to magenta (red/blue). (3) Using 6-pole convergence magnets, overlap the magenta (red/blue) and green lines in the center of the screen and turn them to white.

  • Page 30: Troubleshooting

    SECTION 5 TROUBLESHOOTING SELF CHECK FUNCTIONS 5.1.1 OUTLINE This model has self check functions given below. When an abnormality has been detected, the SUB POWER is turned off and POWER LED flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.
  • Page 31 (No.YA266)1-31...
  • Page 32 Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY DISPLAY CATEGORY 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA266) Printed in Japan...

This manual is also suitable for:

Av-21vt35Av-21yt15/zAv-21vt35/z