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JVC AV-21CMG4 Service Manual

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SERVICE MANUAL
FLAT COLOUR TELEVISION
9
2004
YA124
[AV-21CMT4
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29
AV-21CMG4
AV-21CMT4
AV-2104C
]
[AV-21CGM4
]
/G
/G
[AV-2104C
]
/E

TABLE OF CONTENTS

COPYRIGHT © 2004 Victor Company of Japan, Limited
,
/G
,
/G
/E
BASIC CHASSIS
CW
No.YA124
2004/9

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Summary of Contents for JVC AV-21CMG4

  • Page 1: Table Of Contents

    SERVICE MANUAL FLAT COLOUR TELEVISION YA124 2004 AV-21CMG4 AV-21CMT4 AV-2104C BASIC CHASSIS [AV-21CMT4 [AV-21CGM4 [AV-2104C TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Contents Items AV-21CMG4/G AV-21CMT4/G AV-2104C/E Dimensions (W × H × D) 50.2cm × 47.65cm × 47.16cm Mass 22kg TV RF System B, G, I, D, K, M B, G, I, D, K Colour System TV 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

    • By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged automatically. • Built-in OFF TIMER & RETURN +. MAIN DIFFERENCE LIST Items AV-21CMG4/G AV-21CMT4/G AV-2104C/E MAIN PWB ASS'Y SCW-1059A-H2...
  • Page 5 FUNCTIONS REMOTE CONTROL UNIT RM-C1261-2H [AV-21CMG4/G, AV-2104C/E] SOUND SYSTEM key Number keys COLOUR SYSTEM key -/-- key FAVORITE CHANNEL keys MENU(OK) key TV / VIDEO key MENU ( / , / ) keys PICTURE MODE key MUTING key Not used...
  • Page 6 FRONT PANEL CONTROLS VIDEO AUDIO HEADPHONE jack VOLUME (-/+) buttons IN (VIDEO-2) : VIDEO Remote control sensor IN (VIDEO-2) : AUDIO POWER lamp MENU (OK) button MAIN POWER button CHANNEL (-/+) buttons REAR TERMINAL VIDEO-1 INPUT TERMINAL VIDEO AUDIO VIDEO-1 OUTPUT INPUT OUTPUT TERMINAL...
  • Page 7 MAIN CPU [MAIN PWB : IC701] PIN FUNCTION Pin name Function Pin name Function 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 VrefP_Sdac 3.3V (Positive)

  • Page 8: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER • Unplug the power cord. (1) Remove the 5 screws [A], 2 screws [B] and 1 screw [C] as shown in Fig.1. (2) Withdraw the REAR COVER toward you. CAUTION: When reinstalling the rear cover, carefully push it inward after inserting the MAIN PWB into the REAR COVER groove.
  • Page 9 FRONT CABINET PICTURE TUBE MAIN PWB (CRT SOCKET PWB) SPEAKER D (x4) MAIN PWB (x5) REAR COVER B (x2) Fig.1 (No.YA124)1-9...
  • Page 10 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 11 3.2.3 FACTORY SETTING VALUE SETTING OF SYSTEM CONSTANT SET Setting value Setting item Setting content AV-21CMG4/G AV-21CMT4/G AV-2104C/E MULTI TRIPLE THAI SYSTEM MULTI TRIPLE COMB TILT SUPER BASS SINGLE TEXT SINGLE LANGUAGE E/R/A/P/F E/R/A/P/F E/R/U E/R/U STEREO MONO SOUND MONO...
  • Page 12 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 13 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 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 MAIN PWB ASS'Y S804 S802 J807 J806 S805 S803 S801 FRONT POWER SW S901 CN00S POWER CORD IC702 DEG COIL IC701 YOKE J801 J802 CN00C CN00X TU001 UPPER : FOCUS 1. 5V 1. B1 2. SCL0 2. NC LOWER : SCREEN 3.
  • 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 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-21CMG4/G, AV-21CMT4/G] Initial setting value Adjustment item...
  • Page 20 Measuring Item Test point Adjustment part Description instrument WHITE Signal [2. V/C] Note: BALANCE generator 2. CUTOFF (B) • Set PICTURE MODE (VSM) to "BRIGHT". (Low light) 2. CUTOFF (G) (1) Receive a PAL black and white signal (colour off). adjustment Remote (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 broadcast.
  • Page 22 (4) Set the initial setting value of PAL COLOUR. (5) Connect the oscilloscope between TP-47G and TP-E. (6) Adjust PAL COLOUR to set the value (A) in the figure to +13V [AV-21CMG4/G, AV-21CMT4/G] or +12V [ AV-2104C/E]. - SECAM COLOUR - (–)
  • Page 23 (6) Connect the oscilloscope between TP-47G and TP-E. (–) (7) Adjust NTSC 3.58 TINT to set the value (B) in the figure to +4V [AV-21CMG4/G, AV-21CMT4/G] or +3V [ AV-2104C/E]. (8) Press the [DISPLAY] key twice to return to the normal screen.
  • Page 24 4.7.5 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 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 4.7.7 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 MAGNETS (2) Loosen the retainer screw of the deflection yoke.
  • Page 28 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 29: 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 30 AV-21CMG4 , AV-21CMT4 ,AV-2104C STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY Type No indication : Ceramic capacitor The components identified by the symbol and shading are : Metalized mylar capacitor critical for safety. For continued safety replace safety ciritical : Polypropylene capacitor components only with manufactures recommended parts.
  • Page 31 BLOCK DIAGRAM ................................2-3 CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM [AV-21CMG4/G, AV-21CMT4/G] (1/3) ............... 2-5 MAIN PWB CIRCUIT DIAGRAM [AV-21CMG4/G, AV-21CMT4/G] (2/3),( 3/3) ............2-7 MAIN PWB CIRCUIT DIAGRAM [AV-2104C/E] (1/3) ...................... 2-9 MAIN PWB CIRCUIT DIAGRAM [AV-2104C/E] (2/3),( 3/3) ..................
  • Page 32 BLOCK DIAGRAM MAIN PWB IC701 MAIN MICRO COMPUTER/TELETEXT DECODE/ 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 TELETEXT DECODE MICRO MAIN MEMORY DIGITAL SIGNAL PROCESS COMPUTER TU001...
  • Page 33 CIRCUIT DIAGRAMS MAIN PWB ASS'Y(3/3) (CRT SOCKET) VIDEO-2 MAIN PWB CIRCUIT DIAGRAM [AV-21CMG4/G, AV-21CMT4/G] (1/3) CN10T INPUT CN00C QGA2501F1-06 AUDIO-2 VIDEO-2 CN00T QJL001-065631 J808 J807 J806 QNN0281-002 QNN0281-003 SPEAKER S805 S804 S803 S802 S801 IC801 QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z...
  • Page 34 MAIN PWB CIRCUIT DIAGRAM [AV-21CMG4/G, AV-21CMT4/G] (2/3),(3/3) IC351 TDA6107AJF/N1 SK351 QNZ0536-001 R358 QRZ0107-152Z VER_PROTECT R359 PROTECT F901 STB1 QRZ0107-152Z QMF51E2-3R15J4 CN0PW R360 QGA7901F1-02 QRZ0107-152Z V_SHIFT R910 R597 VA901 QRZ0111-474 VDRB- SG351 SG353 QAF0060-621 C352 C910 VDRA+ 4.7/250 NECK D594 S901...
  • Page 35 MAIN PWB ASS'Y(3/3) MAIN PWB CIRCUIT DIAGRAM [AV-2104C/E] (1/3) (CRT SOCKET) VIDEO-2 CN10T INPUT CN00C AUDIO-2 VIDEO-2 CN00T J808 J807 J806 S805 S804 S803 S802 S801 IC801 R817 J809 SPEAKER C805 K801 D815 IC302 D814 Y811 R824 R825 R322 R822 R326 D808 D809...
  • Page 36 MAIN PWB CIRCUIT DIAGRAM [AV-2104C/E] (2/3),(3/3) IC351 C351 100p C356 SK351 R354 R358 C355 C354 VER_PROTECT R359 PROTECT F901 STB1 CN0PW R360 V_SHIFT R910 C380 R597 VA901 VDRB- SG351 SG353 C910 C352 VDRA+ 4.7/250 S901 NECK D594 R596 SG352 NECK C381 P_ON/OFF Q592...
  • Page 37 PATTERN DIAGRAMS MAIN PWB PATTERN J806 J807 J808 D809 R357 D354 W010 D808 L357 L357 J809 R824 IC302 R818 W002 D355 W190 R825 FRONT S805 R817 D356 IC801 C805 Y708 S801 S802 S803 S804 D8 07 D341 Y705 L356 C8 07 D343 CN0E1 R309...
  • Page 38 VOLTAGE CHARTS <MAIN PWB> <MAIN PWB (CRT SOCKET)> PIN NO. VOLTAGE(V) PIN NO. VOL AGE(V) PIN NO. VOLTAGE(V) PIN NO. VOL AGE(V) PIN NO. VOLTAGE(V) PIN NO. VOL AGE(V) PIN NO. VOLTAGE(V) PIN NO. VOL AGE(V) PIN NO. VOLTAGE(V) PIN NO. VOL AGE(V) IC401 IC351 Q955...
  • Page 39 WAVEFORMS -MAIN PWB- IC401-1 IC401-3 IC401-5 IC401-6 IC401-7 30Vp-p 55Vp-p 28Vp-p 0.6Vp-p 0.8Vp-p IC701-10 IC701-11 IC701-65 IC701-22 IC701-23 IC701-48 [0.2us/div] [0.2us/div] 2.4Vp-p 3.0Vp-p 1.2Vp-p 1.8Vp-p 1.7Vp-p 5.4Vp-p IC701-66 IC701-67 IC701-74 IC701-85 IC701-86 IC701-87 5.4Vp-p 4.0Vp-p 1.0Vp-p 2.0Vp-p 1.5Vp-p 2.4Vp-p T522-2 T522-3 T522-4 T522-5...
  • Page 40 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.YA124) Printed in Japan...

This manual is also suitable for:

Av-21cmg4/gAv-21cmt4Av-21cmt4/gAv-2104cAv-2104c/e