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JVC AV-29JS25 Service Manual

Flat colour television
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Download this manual See also: Instruction Manual
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
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-29JS25

  • Page 1: Table Of Contents

    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 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 PAL / SECAM / 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-29JS25 AV-29WX25/G STEREO SYSTEM A2 / NICAM Playback...
  • Page 5 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 Hout O Horizontal output VrefP_Sdac 3.3V (Positive) VssComb...

  • Page 6: Disassembly

    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 [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 CHASSIS BASE CLAW B (under side) (⋅...
  • Page 8 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 [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 CHASSIS BASE CLAW B (under side) X 4) REAR COVER...
  • Page 10 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 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 STEREO BILINGUAL BLUE BACK MUTE...
  • Page 12 Refer to OPERATING INSTRUCTIONS 5. H-SIZE 6. TRAPEZ EDIT / MANUAL Refer to OPERATING INSTRUCTIONS 7. EW-PIN LANGUAGE 8. COR-UP TEXT LANGUAGE GROUP-1 [AV-29JS25] 9. COR-LO GROUP-4 [AV-29WX25/G] 10. ANGLE WHITE BALANCE (RF) COOL 11. BOW 12. V-S.CR BALANCE Centre 13.
  • Page 13 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 14: 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 15 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 ROTATION COIL S901 CN00S CNDEG CN002 CN001 POWER CORD DEG COIL MAIN PWB ASS’Y FRONT CN001 CN00W...
  • Page 16 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 17 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 18 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 • 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-29JS25] Initial setting value Adjustment item...
  • Page 20 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). control unit SCREEN VR (2) Select 2.
  • Page 21 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 PAL broadcast.
  • Page 22 NTSC 3.58 colour system. (3) Set the initial setting value of NTSC 3.58 COLOUR. (4) Adjust NTSC 3.58 COLOUR to set the value (A) in the figure to +18V [AV-29JS25] or +21V [AV- 29WX25/G]. - NTSC 4.43 COLOUR - When adjustment is done for NTSC 3.58 COLOUR, appropriate values are automatically set for NTSC 4.43...
  • Page 23 (6) Connect the oscilloscope between TP-47B and TP-E. (7) Adjust NTSC 3.58 TINT to set the value (B) in the M R B figure to +2V [AV-29JS25] or +7V [AV-29WX25/G]. (8) Press the [DISPLAY] key twice to return to the normal screen.
  • Page 24 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. A2 ID THR [AV-29JS25] Function MODE...
  • Page 25 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 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 27 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 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. V-S. CR. control unit (4) Select 13.
  • Page 29 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 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. EW-PIN. control unit (4) Adjust 7.
  • Page 31 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 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 33 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

    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 (No.YA281)1-35...
  • Page 36 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...

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