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JVC AV-29MX7 Service Manual

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SERVICE MANUAL
FLAT COLOUR TELEVISION
8
YA281
2005
EXIT
RM-C1286
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
All manuals and user guides at all-guides.com
AV-29JS25,
AV-29WX25

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
/G
BASIC CHASSIS
CW2
No.YA281
2005/8

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Summary of Contents for JVC AV-29MX7

  • Page 1: Table Of Contents

    All manuals and user guides at all-guides.com SERVICE MANUAL FLAT COLOUR TELEVISION YA281 2005 AV-29JS25, AV-29WX25 BASIC CHASSIS EXIT RM-C1286 TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 All manuals and user guides at all-guides.com SPECIFICATION Contents Items AV-29JS25 AV-29WX25/G Dimensions (W × H × D) 73.1cm × 62.2cm × 49.45cm 81.2cm × 58.42cm × 51.8cm Mass 42.5kg TV RF System B, G, I, D, K, M Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC4.43 Video Mode...

  • Page 3: Precaution

    All manuals and user guides at all-guides.com 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

    All manuals and user guides at all-guides.com SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES • New chassis design enables use of an interactive on-screen control. • Pure flat CRT produces fine textured picture in every detail. • Wide range voltage (110V ~ 240V) for AC power input. •...
  • Page 5 All manuals and user guides at all-guides.com MAIN CPU [MAIN PWB : IC701] PIN FUNCTION Pin name Function Pin name Function HP-R O Not used VssP2 CVBSO/PIP O CVBS / PIP output VssC4 O Not used V1.8C4 1.8V (Digital) FbiSo Flyback input/sandcastle output V3.3A3 3.3V...

  • Page 6: Disassembly

    All manuals and user guides at all-guides.com SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE [AV-29JS25] 3.1.1 REMOVING THE REAR COVER 3.1.5 REMOVING THE SPEAKER • Unplug the power cord. • Remove the REAR COVER. (1) Remove the 16 screws [A] as shown in Fig.1. (1) Remove the 2 screws [G], and remove the SPEAKER (2) Withdraw the REAR COVER toward you.
  • Page 7 All manuals and user guides at all-guides.com [FRONT SIDE] CONTROL BASE SPEAKER CHASSIS BASE Fig.2 (⋅ 2) (⋅ 2) SPEAKER HOLDER CRT SOCKET PWB FRONT PWB CLAW B (under side) MAIN PWB SPEAKER (⋅ 2) Fig.2 (⋅ 2) AV TERMINAL CONTROL BASE BOARD SPEAKER HOLDER...
  • Page 8 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE [AV-29WX25/G] 3.2.1 REMOVING THE REAR COVER 3.2.5 REMOVING THE SPEAKER • Unplug the power cord. • Remove the REAR COVER. (1) Remove the 16 screws [A] as shown in Fig.3. (1) Remove the 2 screws [G] as shown in Fig.3. (2) Withdraw the REAR COVER toward you.
  • Page 9 All manuals and user guides at all-guides.com [FRONT SIDE] CONTROL BASE FRONT CABINET (X2) CHASSIS PICTURE TUBE BASE SPEAKER Fig.4 FRONT CONTROL PWB (2/2) SOCKET PWB CLAW B (under side) FRONT CONTROL MAIN PWB PWB (1/2) SPEAKER Fig.2 AV TERMINAL BOARD (X2) CONTROL BASE...
  • Page 10 All manuals and user guides at all-guides.com REPLACEMENT OF MEMORY IC 3.3.1 MEMORY IC This TV uses the following memory IC. Memory IC: IC702 on MAIN PWB SERVICE MENU 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 11 All manuals and user guides at all-guides.com 3.3.3 FACTORY SETTING VALUE SETTING OF SYSTEM CONSTANT SET Setting value Setting item Setting content AV-29JS25 AV-29WX25/G MULTI TRIPLE THAI SYSTEM MULTI COMB TILT SUPER BASS SINGLE TEXT E/R/C/M/I LANGUAGE E/R/C/M/I E/R/A/P/F E/R/A/P/F STEREO MONO SOUND...
  • Page 12 All manuals and user guides at all-guides.com 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 VOLUME 2. V/C 1. SCREEN 2. CUTOFF(B/G) INPUT 3.
  • Page 13 All manuals and user guides at all-guides.com 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.

  • Page 14: Adjustment

    All manuals and user guides at all-guides.com 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 15 All manuals and user guides at all-guides.com ADJUSTMENT LOCATIONS FRONT CONTROL PWB ASS’Y (1/2) FRONT CONTROL PWB ASS’Y (2/2) SPEAKER (L) SPEAKER (R) FRONT FRONT S805 S801 S803 J804 J803 J802 J801 S804 S806 S802 S901 ROTATION COIL CN00S CNDEG CN002 CN001 POWER...
  • Page 16 All manuals and user guides at all-guides.com 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.
  • Page 17 All manuals and user guides at all-guides.com 4.6.3 SERVICE MENU FLOW CHART SERVICE MENU 1. IF 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.
  • Page 18 All manuals and user guides at all-guides.com ADJUSTMENT PROCEDURE 4.7.1 B1 VOLTAGE Measuring Item Test point Adjustment part Description instrument B1 VOLTAGE Signal B1 (pin 1) (1) Receive a PAL 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 19 All manuals and user guides at all-guides.com 4.7.4 VIDEO CIRCUIT ADJUSTMENTS • 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. •...
  • Page 20 All manuals and user guides at all-guides.com 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 (colour off).
  • Page 21 All manuals and user guides at all-guides.com 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.
  • Page 22 All manuals and user guides at all-guides.com Measuring Item Test point Adjustment part Description instrument SUB COLOUR 2 Signal TP-47B [2. V/C] [Method of adjustment using measuring instrument] Notes: adjustment generator TP-E 6. COLOUR • Proceed to the following adjustment after having [CRT SOCKET completed the SUB CONTRAST adjustment.
  • Page 23 All manuals and user guides at all-guides.com Measuring Item Test point Adjustment part Description instrument SUB TINT 1 Signal [2. V/C] [Method of adjustment without measuring instrument] adjustment generator 7. TINT Notes: • Proceed to the following adjustment after having Remote completed the SUB CONTRAST adjustment.
  • Page 24 All manuals and user guides at all-guides.com 4.7.5 AUDIO SETTING This submenu is for display only, no adjustment is required. [AV-29JS25] Function Item Setting value AUDIO 1. DC XO ADJ 2. NICAM LOWER ERR LIM 3. NICAM UPPER ERR LIM 4.
  • Page 25 All manuals and user guides at all-guides.com 4.7.6 DEFLECTION CIRCUIT ADJUSTMENTS • 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. •...
  • Page 26 All manuals and user guides at all-guides.com 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.
  • Page 27 All manuals and user guides at all-guides.com Measuring Item Test point Adjustment part Description instrument H. WIDTH Signal [4.DEF] - PAL H. WIDTH - adjustment generator 5. H-SIZE (1) Receive a PAL crosshatch signal. (2) Select 5. H-SIZE. Remote (3) Set the initial setting value of 5. H-SIZE. control unit (4) Adjust 5.
  • Page 28 All manuals and user guides at all-guides.com Measuring Item Test point Adjustment part Description instrument V.LINEARITY Signal [4. DEF] - PAL V. LINEARITY - adjustment generator 12. V-S. CR (1) Receive a PAL crosshatch signal. 13. V-LIN (2) Select 12. V-S.CR. Remote (3) Set the initial setting value of 12.
  • Page 29 All manuals and user guides at all-guides.com 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 30 All manuals and user guides at all-guides.com Measuring Item Test point Adjustment part Description instrument SIDE PIN Signal [4. DEF] - PAL SIDE PIN - adjustment generator 7. EW-PIN (1) Receive a PAL crosshatch signal. (2) Select 7. EW-PIN. Remote (3) Set the initial setting value of 7.
  • Page 31 All manuals and user guides at all-guides.com 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 32 All manuals and user guides at all-guides.com 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.
  • Page 33 All manuals and user guides at all-guides.com STATIC CONVERGENCE ADJUSTMENT (1) Input a crosshatch signal. (2) Using 4-pole convergence magnets, overlap the red and blue lines in the centre 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 centre of the screen and turn them to white.

  • Page 34: Troubleshooting

    All manuals and user guides at all-guides.com 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 35 All manuals and user guides at all-guides.com (No.YA281)1-35...
  • Page 36 All manuals and user guides at all-guides.com 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.YA281) Printed in Japan...

This manual is also suitable for:

Av-29wx25/gAv-29ms25Av-29js25