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JVC AV-21D114 Service Manual
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JVC AV-21D114 Service Manual

Jvc av-21d114: user guide
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SERVICE MANUAL
2
2005
YA153
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
COLOUR TELEVISION
AV-21D114

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
/B
BASIC CHASSIS
CW
No.YA153
2005/2

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Summary of Contents for JVC AV-21D114

  • Page 1: Table Of Contents

    TROUBLESHOOTING ..............1-27 COPYRIGHT © 2005 Victor Company of Japan, Limited AV-21D114 TABLE OF CONTENTS BASIC CHASSIS No.YA153...
  • Page 2 Items Dimensions (W Mass TV RF System Colour System TV Mode Video Mode Stereo System Receiving Frequency VHF Low VHF High CATV Intermediate VIF 38.0MHz Frequency SIF B/G: 32.5MHz (5.5MHz) Colour Sub Carrier Frequency Aerial Input Terminal Power Input Power Consumption...

  • Page 3: Precaution

    SAFETY PRECAUTIONS (1) The design of this product contains special hardware, many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits.

  • Page 4: Specific Service Instructions

    • With AUDIO/VIDEO input terminals. • I C bus control utilizes single chip ICs. • 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 +.
  • Page 5 FRONT PANEL CONTROLS VIDEO AUDIO IN (VIDEO-2) 1 HEADPHONE jack IN (VIDEO-2) : VIDEO IN (VIDEO-2) : AUDIO MENU (OK) button CHANNEL (-/+) buttons REAR TERMINAL VIDEO-1 OUTPUT INPUT VIDEO AUDIO MENU VOLUME (-/+) buttons Remote control sensor TIMER lamp POWER lamp MAIN POWER button VIDEO-1 INPUT TERMINAL...
  • Page 6 MAIN CPU [MAIN PWB : IC701] PIN FUNCTION Pin name VssP2 VssC4 V1.8C4 1.8V (Digital) V3.3A3 3.3V VrefP_Sdac 3.3V (Positive) VrefN_Sdac VrefP_Sdac 3.3V (Negative) VrefN_Sdac VrefP_Sdac 3.3V (Positive) XtalIn 24.576MHz for system clock XtalOut O 24.576MHz for system clock VssA1 NECK V-guard input/ I/O switch CONT...

  • Page 7: Disassembly

    DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER • Unplug the power cord. (1) Remove the 7 screws [A] and 2 screws [B] 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 8 PICTURE TUBE (x4) FRONT CABINET SPEAKER MAIN PWB (CRT SOCKET PWB) MAIN PWB (x4) SPEAKER (x7) REAR COVER (x2) Fig.1 1-8 (No.YA153)
  • Page 9 REPLACEMENT OF MEMORY IC 3.2.1 MEMORY IC This TV uses the following memory IC. 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 to use the same type IC written with the initial values of data.
  • Page 10 3.2.3 FACTORY SETTING VALUE SETTING OF SYSTEM CONSTANT SET Setting item SYSTEM COMB TILT SUPER BASS TEXT LANGUAGE SOUND BILINGUAL BLUE BACK MUTE COLOUR AUTO ECO SENSOR SURROUND PICTURE BOOSTER COMPONENT S INPUT 1-10 (No.YA153) Setting content MULTI TRIPLE THAI SINGLE STEREO MONO...
  • Page 11 1. VCO 2. DELAY POINT 2. V/C 1. SCREEN DATA 2. CUTOFF(B/G) 3. WDR(R/G/B) 4. BRIGHT(TV/VDO 1/2) 5. CONT(TV/VDO 1/2) 6. COLOUR(TV/VDO1/2) 7. TINT(TV/VDO 1/2) 8. SHARP [Do not adjust] 9. Y DELAY [Do not adjust] 10. TINT DVD [Do not adjust] 11.
  • Page 12 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 13: 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 POWER SW S901 POWER CORD DEG COIL 1-14 (No.YA153) S804 S802 J807 J806 S805 S803 S801 CN00S IC702 IC701 J801 J802 CN00C CN00X TU001 1. 5V 1. B1 2. SCL0 2. NC 3. SDA0 3. X-RAY2 4.
  • 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 3. WDR (R/G/B) 4. BRIGHT (TV/VDO1/2) 5. CONT (TV/VDO1/2) 6. COLOUR (TV/VDO1/2) 7. TINT (TV/VDO1/2) 8. SHARP (TV/VDO1/2) 9. Y DELAY (TV/VDO1/2) Setting item 1. DCXO ADJ 2. NICAM lower ERRLIM 3. NICAM upper ERRLIM 4. A2 ID THR MENU EQUALIZER...
  • Page 17 ADJUSTMENT PROCEDURE 4.7.1 B1 VOLTAGE Measuring Item Test point instrument B1 VOLTAGE Signal B1 (pin 1) check generator GND (pin 5) [CN00X DC voltmeter connector in MAIN PWB] 4.7.2 FOCUS ADJUSTMENT Measuring Item Test point instrument FOCUS Signal adjustment generator 4.7.3 IF CIRCUIT ADJUSTMENTS Measuring Item...
  • Page 18 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 19 Measuring Item Test point instrument WHITE Signal BALANCE generator (High light) adjustment Remote control unit 3. WDR REMOTE CONTROL UNIT R DRIVE ( R DRIVE ( SUB BRIGHT Remote adjustment control unit Remote CONTRAST control unit adjustment Adjustment part [2. V/C] Notes: 3.
  • Page 20 Measuring Item Test point instrument SUB COLOUR 1 Remote adjustment control unit SUB COLOUR 2 Signal TP-47G adjustment generator TP-E [CRT SOCKET Oscilloscope PWB] Remote control unit 1-20 (No.YA153) Adjustment part [2. V/C] [Method of adjustment without measuring instrument] 6. COLOUR Notes: •...
  • Page 21 Measuring Item Test point instrument SUB TINT 1 Signal adjustment generator Remote control unit SUB TINT 2 Signal TP-47G adjustment generator TP-E [CRT SOCKET Oscilloscope PWB] Remote control unit Adjustment part [2. V/C] [Method of adjustment without measuring instrument] 7. TINT Notes: •...
  • Page 22 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 23 Measuring Item Test point instrument H. POSITION Signal adjustment generator Remote control unit V.LINEARITY Signal adjustment generator Remote control unit H. PARALLEL Signal adjustment generator Remote control unit Parallel Adjustment part [4. DEF] - PAL H. POSITION - 4. H-CENT (1) Receive a PAL circle pattern signal.
  • Page 24 Measuring Item Test point instrument H. BOW Signal adjustment generator Remote control unit Straight 4.7.6 VSM PRESET SETTING Measuring Item Test point instrument Remote PRESET control unit setting SUB MENU 5. VSM W/B VSM PRESET BRIGHT 1. BRIGHT 1-24 (No.YA153) Adjustment part [4.DEF] - PAL H.
  • Page 25 4.7.7 PURITY AND CONVERGENCE PURITY ADJUSTMENT Note: The final adjustment of CONVERGENCE must be done after the FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.) When makes difference by FOCUS adjustment, should be reconfirming PURITY adjustment. (1) Demagnetize CRT with the demagnetizer. (2) Loosen the retainer screw of the deflection yoke.
  • Page 26 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 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 27: 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 28 1-28 (No.YA153)
  • Page 29 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.YA153) Printed in Japan...

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Av-21d114/b