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JVC AV-21V115/B Service Manual
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JVC AV-21V115/B Service Manual

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SERVICE MANUAL
11
2005
YA340
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
COLOUR TELEVISION
AV-21V115
TABLE OF CONTENTS
COPYRIGHT © 2005 Victor Company of Japan, Limited
/B
BASIC CHASSIS
CW
No.YA340
2005/11

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Summary of Contents for JVC AV-21V115/B

  • Page 1 SERVICE MANUAL COLOUR TELEVISION YA340 2005 AV-21V115 BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .

  • Page 2: Service Menu

    REPLACEMENT OF MEMORY IC 3.2.1 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 SERVICE MENU and deflection circuits. When replacing the memory IC, be sure 1.
  • Page 3 3.2.3 FACTORY SETTING VALUE SETTING OF SYSTEM CONSTANT SET Setting item Setting content Setting value MULTI TRIPLE THAI SYSTEM THAI COMB TILT SUPER BASS SINGLE TEXT LANGUAGE STEREO MONO SOUND MONO BILINGUAL BLUE BACK MUTE COLOUR AUTO ECO SENSOR SURROUND PICTURE BOOSTER COMPONENT S INPUT...
  • Page 4 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 DATA VOLUME 2. CUTOFF(B/G) COLOR SYSTEM 3. WDR(R/G/B) 4. BRIGHT(TV/VDO 1/2) SOUND SYSTEM 5.

  • Page 5: Block Diagram

    BLOCK DIAGRAM MAIN PWB IC701 MAIN MICRO COMPUTER IC351 IF . VIDEO . RGB . SYNC . DEF. PROCESS RGB OUT MAIN PWB 108,109 SCL1, SDA1 (CRT SOCKET) I 2 C IC702 127,128 SCL0, SDA0 MICRO MAIN MEMORY DIGITAL SIGNAL PROCESS COMPUTER TU001 98,99...

  • Page 6: Main Pwb Circuit Diagram

    CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/3) MAIN PWB ASS'Y(3/3) (CRT SOCKET) VIDEO-2 CN10T INPUT CN00C CN00T J808 J807 J806 S805 S804 S803 S802 S801 SPEAKER IC801 R817 J809 C805 POWER LED (RED) K801 D815 IC302 D814 Y811 R322 R824 R825 R822 1.2K...

  • Page 7: Main Pwb Circuit Diagram (2/3)

    MAIN PWB CIRCUIT DIAGRAM (2/3), (3/3) IC351 SK351 R358 VER_PROTECT R359 PROTECT F901 STB1 CN0PW R360 V_SHIFT R597 VA901 VDRB- SG351 SG353 C352 C910 4.7/250 VDRA+ NECK D594 AC110V-AC240V S901 R596 SG352 NECK Q592 50Hz/60Hz PROTECT LF901 V_SHIFT 3.3V_STB R595 D593 P_ON/OFF Q591...

  • Page 8: Main Pwb

    WAVEFORMS -MAIN PWB- IC401-1 IC401-3 IC401-5 IC401-6 28Vp-p 54Vp-p 30Vp-p 0.5Vp-p IC701-10 IC701-11 IC701-22 IC701-23 IC701-48 [0.2us/div] [0.2us/div] 2.8Vp-p 3.4Vp-p 2.0Vp-p 2.8Vp-p 2.0Vp-p IC701-66 IC701-67 IC701-74 IC701-85 IC701-86 IC701-87 5.4Vp-p 3.6Vp-p 1.3Vp-p 2.2Vp-p 1.8Vp-p 2.4Vp-p T522-2 T522-3 T522-5 T522-7 T522-9 3.0Vp-p 240Vp-p 55Vp-p...

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