JVC AV-21VT15 Service Manual
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JVC AV-21VT15 Service Manual

JVC AV-21VT15 Service Manual

Jvc flat color television service manual
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SERVICE MANUAL
1
2005
YA254
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
Specific Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29
FLAT COLOR TELEVISION
AV-21VT15

TABLE OF CONTENTS

COPYRIGHT © 2005 Victor Company of Japan, Limited
/R
BASIC CHASSIS
CW
No.YA254
2005/4

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Summary of Contents for JVC AV-21VT15

  • Page 1 FLAT COLOR TELEVISION YA254 2005 AV-21VT15 BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions (W 64.9cm 46.55cm 47.35cm Mass 25kg TV RF System M / N Color System TV Mode NTSC / PAL-M / PAL-N Video Mode NTSC / PAL-M / PAL-N Stereo System MTS (Multi-Channel Television Sound) Receiving Frequency VHF Low 46.25 MHz ~ 140.25 MHz (AS0 ~ S6) VHF High...

  • 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

    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. • With AUDIO/VIDEO/S-VIDEO/COMPONENT input terminals. •...
  • Page 5 FRONT PANEL CONTROLS POWER MENU HEADPHONE jack VOLUME (-/+) buttons IN (VIDEO-3) : VIDEO Remote control sensor IN (VIDEO-3) : AUDIO L/MONO ECO sensor IN (VIDEO-3) : AUDIO R POWER lamp MENU (OK) button MAIN POWER button CHANNEL (-/+) buttons REAR TERMINAL VIDEO-1 INPUT TERMINAL S-VIDEO...
  • Page 6 MAIN CPU [MAIN PWB : IC701] PIN FUNCTION Pin no. Pin name Remark Pin no. Pin name Remark 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...

  • Page 7: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER • Unplug the power cord. (1) Remove the 9 screws [A] and 4 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 FRONT CABINET PICTURE TUBE (x2) SPEAKER MAIN PWB (CRT SOCKET PWB) MAIN PWB (x2) SPEAKER (x9) REAR COVER (x4) Fig.1 1-8 (No.YA254)
  • Page 9 REPLACEMENT OF MEMORY IC 3.2.1 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 10 3.2.3 FACTORY SETTING VALUE SETTING OF SYSTEM CONSTANT SET Setting item Setting content Setting value TAIWAN OTHERS SYSTEM OTHERS COMB TILT SUPER BASS STEREO MONO SOUND STEREO BLUE BACK MUTE ECO SENSOR SURROUND PICTURE BOOSTER COMPONENT S INPUT Table 1 1-10 (No.YA254)
  • Page 11 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 VOLUME 2. CUTOFF(B/G) COLOR SYSTEM PAL-N 3. WDR(R/G/B) 4. BRIGHT(TV/VDO 1/2/3) PICTURE MODE (VSM) BRIGHT 5.
  • 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

    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 14 ADJUSTMENT LOCATIONS MAIN PWB ASS'Y S804 S802 J808 J807 J806 J809 S805 S803 S801 FRONT POWER SW S901 CN00S POWER CORD IC702 DEG COIL IC701 YOKE J801 J802 J803 J804 CN00C CN00C CN00X TU001 UPPER : FOCUS 1. 5V 1. B1 2.
  • 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 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 17 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 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 Adjustment part Description instrument WHITE Signal [2. V/C] Notes: BALANCE generator 3. WDR (R) • Proceed to the following adjustment after having (High light) 3. WDR (G) completed the WHITE BALANCE (Low light) adjustment. adjustment Remote 3.
  • Page 20 Measuring Item Test point Adjustment part Description instrument SUB COLOR 1 Remote [2. V/C] [Method of adjustment without measuring instrument] adjustment control unit 6. COLOUR Notes: • Proceed to the following adjustment after having completed the SUB CONTRAST adjustment. • Set PICTURE MODE (VSM) to "BRIGHT". - PAL-M COLOR - (1) Receive a PAL-M broadcast.
  • Page 21 Measuring Item Test point Adjustment part Description instrument SUB COLOR 2 Signal TP-47G [2. V/C] [Method of adjustment using measuring instrument] adjustment generator TP-E 6. COLOUR Notes: [CRT SOCKET • Proceed to the following adjustment after having Oscilloscope PWB] completed the SUB CONTRAST adjustment. •...
  • Page 22 Measuring Item Test point Adjustment part Description instrument SUB TINT 2 Signal TP-47G [2. V/C] [Method of adjustment using measuring instrument] adjustment generator TP-E 7. TINT Notes: [CRT SOCKET • Proceed to the following adjustment after having Oscilloscope PWB] completed the SUB CONTRAST adjustment. •...
  • Page 23 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 24 Measuring Item Test point Adjustment part Description instrument V. HEIGHT Signal [4. DEF] - PAL V. HEIGHT - adjustment generator 3. V-SIZE (1) Receive a PAL crosshatch signal. 14. V-ZOOM (2) Select 3. V-SIZE. Remote (3) Set the initial setting value of 3. V-SIZE. control unit (4) Select 14.
  • Page 25 Measuring Item Test point Adjustment part Description instrument H. PARALLEL Signal [4.DEF] - PAL H. PARALLEL - adjustment generator 10. ANGLE (1) Receive a PAL crosshatch signal. (2) Select 10. ANGLE. Remote (3) Set the initial setting value of 10. ANGLE. control unit (4) Adjust 10.
  • Page 26 COMPRESS : ON (16:9) Measuring Item Test point Adjustment part Description instrument V. HEIGHT Signal [4.DEF] - PAL V. HEIGHT - adjustment generator 14. V. ZOOM (1) Receive a PAL crosshatch signal of vertical 3. V-SIZE frequency 50Hz. Remote (2) Press the [MENU] key and select PICTURE. control unit (3) Select PICTURE FEATURES.
  • Page 27 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 28 4.7.8 CONVERGENCE STATIC CONVERGENCE ADJUSTMENT (1) Input a crosshatch signal. (2) Using 4-pole convergence magnets, overlap the red and blue lines in the center 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 center 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 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.YA254) Printed in Japan...
  • Page 31 SCHEMATIC DIAGRAMS FLAT COLOR TELEVISION YA254 2005 AV-21VT15 CD-ROM No.SML200504 BASIC CHASSIS No.YA254 COPYRIGHT © 2005 Victor Company of Japan, Limited 2005/4...
  • Page 32 AV-21VT15 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 33: Block Diagram

    TOP VIEW CHIP TR E C B E C B ( G ) ( D ) ( S ) BOTTOM VIEW FRONT VIEW TOP VIEW CHIP IC TOP VIEW USING P.W.BOARD P.W. BOARD ASS'Y NAME AV-21VT15/R MAIN P.W. BOARD SCW-1126A-H2 2-2(No.YA254)
  • Page 34 BLOCK DIAGRAM MAIN PWB IC701 MAIN MICRO COMPUTER/ IF VIDEO RGB SYNC DEF. PROCESS IC351 108,109 SCL1, SDA1 RGB OUT I 2 C IC702 127,128 SCL0, SDA0 MICRO MAIN MEMORY DIGITAL SIGNAL PROCESS COMPUTER TU001 98,99 TUNER REMOTE PORT KEY_IN CRT SOCKET PEAKING SCAN ROUT...
  • Page 35 CIRCUIT DIAGRAMS MAIN PWB ASS'Y(3/3) (CRT SOCKET) VIDEO-3 MAIN PWB CIRCUIT DIAGRAM (1/3) CN10T INPUT CN00T CN00C QGA2501F1-06 QJL001-065631 J806 QNN0281-003 J808 J807 QNN0281-002 QNN0282-001 IC801 S805 S804 S803 S802 S801 QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z RPM7238-H5 J809 SPEAKER REMOTECON R817 CN00S C805...
  • Page 36 MAIN PWB CIRCUIT DIAGRAM (2/3) ,(3/3) IC351 TDA6107AJF/N1 SK351 QNZ0536-001 R358 QRZ0107-152Z R359 PROTECT F901 QRZ0107-152Z QMF51E2-4R0J4 RY901 STB1 QSK0061-002 CN0PW R360 QGA7901F1-02 QRZ0107-152Z D956 C966 C352 100/16 VDRB- R597 4.7/250 VA901 R910 SG351 SG353 R963 QAF0060-621 QRZ0107-474Z C910 VDRB- VDRA+ QFZ9077-104 Q955...
  • Page 37 PATTERN DIAGRAMS MAIN PWB PATTERN R818 R822 C805 J808 D809 R824 R357 L357 D354 J806 J807 R825 IC302 D355 IC801 D808 R325 J809 D356 R324 S801 S802 S803 S804 S805 L356 SG351 C806 CN0E1 D814 F901 D807 R628 R318 R327 W096 R321 R633...
  • 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 IC974 TU001...
  • Page 39 WAVEFORMS -MAIN PWB- IC401-1 IC401-3 IC401-5 IC401-6 IC401-7 25Vp-p 55Vp-p 27Vp-p 0.6Vp-p 0.6Vp-p IC701-10 IC701-11 IC701-22 IC701-23 IC701-48 IC701-66 IC701-67 [0.2us/div] [0.2us/div] 2.3Vp-p 3.1Vp-p 0.8Vp-p 1.1Vp-p 2.1Vp-p 5.4Vp-p 3.0Vp-p IC701-74 IC701-85 IC701-86 IC701-87 1.2Vp-p 2.0Vp-p 1.6Vp-p 2.4Vp-p T522-2 T522-4 T522-6 T522-7 T522-8 T522-9...
  • 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.YA254) Printed in Japan...
  • Page 41 PARTS LIST CAUTION The parts identified by the symbol are important for the safety . Whenever replacing these parts, be sure to use specified ones to secure the  safety. The parts not indicated in this Parts List and those which are filled with lines --- in the Parts No. columns will not be supplied. P.W.

  • Page 42: Table Of Contents

    CONTENTS USING P.W. BOARD & REMOTE CONTROL UNIT ....................3-3 EXPLODED VIEW PARTS LIST -1 ..........................3-3 EXPLODED VIEW -1 ..............................3-3 EXPLODED VIEW PARTS LIST -2 ..........................3-4 EXPLODED VIEW -2 ..............................3-5 PRINTED WIRING BOARD PARTS LIST ........................3-6 MAIN P.W.

  • Page 43: Exploded View Parts List

    USING P.W. BOARD & REMOTE CONTROL UNIT P.W.B ASS'Y AV-21VT15/R MAIN P.W.B SCW-1126A-Y2 REMOTE CONTROL UNIT RM-C1288-1H EXPLODED VIEW PARTS LIST -1  Ref.No. Part No. Part Name Description Local GG30068-001A-H AV SHEET GG40023-003A-H JVC MARK GG30044-001B-H REMOCON LENS GG30042-001B-H LED LENS ...
  • Page 44 EXPLODED VIEW PARTS LIST -2  Ref.No. Part No. Part Name Description Local  V01 A51QDX993X006 PICTURE TUBE Inc.DEF YOKE,PC MAGNET  L01 QQW0146-001 DEG COIL  T522 QQH0188-001 FB TRANSF QYSBSBG4016ZA TAP SCREW M4 x 16mm(x9) QYSBSF3010ZA TAP SCREW M3 x 10mm(x4) GG10187-013A-HK REAR COVER...
  • Page 45 EXPLODED VIEW -2 FRONT CABINET MAIN PWB (CRT SOCKET PWB) T522 MAIN PWB (No.YA254)3-5...

  • Page 46: Printed Wiring Board Parts List

    PRINTED WIRING BOARD PARTS LIST MAIN P.W. BOARD ASS'Y (SCW-1126A-Y2) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local D713 MA8039/H/-X Z DIODE D714 MA8030/H/-X Z DIODE IC302 S9066-11 PHOTO CONDUCTOR D751 MA8091/H/-X Z DIODE IC351 TDA6107AJF/N1...
  • Page 47 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C530 QCB32HK-561Z C CAPACITOR 560pF 500V K C762 QETN1CM-107Z E CAPACITOR 100uF 16V M C532 QETN2EM-106Z E CAPACITOR 10uF 250V M C763 NCB31CK-224X C CAPACITOR 0.22uF 16V K C551 QCB32HK-561Z...
  • Page 48 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R006 NRSA63J-0R0X MG RESISTOR 0 1/16W J R632 QRE121J-271Y C RESISTOR 270 1/2W J R007 NRSA63J-103X MG RESISTOR 10k 1/16W J R633 NRSA63J-102X MG RESISTOR 1k 1/16W J R008 NRSA63J-103X...
  • Page 49 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R804 NRSA63J-750X MG RESISTOR 75 1/16W J CP955 ICP-N75-Y IC PROTECTOR 2.7A R805 NRSA63J-750X MG RESISTOR 75 1/16W J QMF51E2-4R0J4 FUSE 4A AC250V F901 R806 NRSA63J-750X MG RESISTOR...

  • Page 50: Remote Control Unit Parts List (Rm-C1288-1H)

    REMOTE CONTROL UNIT PARTS LIST (RM-C1288-1H)  Ref No. Part No. Part Name Description Local R25-8566 BATTERY COVER PACKING PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local GG10359-004A-D PACKING CASE GG10188-007A-D CUSHION ASS'Y 4pcs in 1set GG30124-003A-D POLY BAG GG30123-001A-D POLY BAG INST.

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