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JVC AV-20F475 Service Manual

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SERVICE MANUAL
4
2004
YA052
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
COLOR TELEVISION
AV-20F475
AV-N21F45

TABLE OF CONTENTS

,
/S
/S
BASIC CHASSIS
FJ2
No.YA052
2004/4

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   Summary of Contents for JVC AV-20F475

  • Page 1: Table Of Contents

    SERVICE MANUAL COLOR TELEVISION YA052 2004 AV-20F475 AV-N21F45 BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 66.7cm × 47.7cm × 50.5cm (26-1/4" × 18-13/16" × 19-7/8") Mass 25kg (55lbs) TV RF System CCIR(M) Color System NTSC Sound System BTSC (Multi Channel Sound) TV Receiving Channels VHF Low 02ch~06ch : 54MHz~88MHz and Frequency...
  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS (1) The design of this product contains special hardware, many replaced. Always manufacturer's replacement circuits and components specially for safety purposes. For components. continued protection, no changes should be made to the original (10) Isolation Check (Safety for Electrical Shock Hazard) design unless authorized in writing by the manufacturer.
  • Page 4: Specific Service Instructions

    It became legible from any position by CRT with few reflection healthy program. and reflect lumps on the flat screen. WORLD CLOCK [AV-20F475] COMPONENT INPUT The world clock feature provides time differences for some of Since the component signal input terminal is equipped, it the major cities around the world in real time.
  • Page 5 TECHNICAL INFORMATION 2.3.1 SYSTEM BLOCK DIAGRAM REMOCON REMOCON IC101 RECEIVER A F T 1 IC201 IF DET MAIN MI-COM / VIDEO PROCESS / IC702 S C L 1 DEF. PROCESS MEMORY S D A 1 SCL0 SDA0 S C L 0 S D A 0 S C L 0 S D A 0...
  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER 3.1.4 CHECKING THE MAIN PWB (1) Unplug the power plug. To check the PW Board from back side. (2) Remove the 7 screws [A] as shown in the Fig.1. (1) Pull out the MAIN PWB (refer to REMOVING THE MAIN (3) Remove the 4 screws [B] as shown in the Fig.1.
  • Page 7 FRONT CABINET SPEAKER SPACER SPEAKER HOLDER CRT SOCKET PWB MAIN PWB (PWB STOPPER) REAR COVER POWER CORD Fig.1 (No.YA052)1-7...
  • Page 8 MEMORY IC REPLACEMENT • This model uses the memory IC. • This memory IC stores data for proper operation of the video and drive circuits. • When replacing, be sure to use an IC containing this (initial value) data. 3.2.1 MEMORY IC REPLACEMENT PROCEDURE 3.2.2 SERVICE MODE SETTING ITEMS 1.
  • Page 9 Setting item Setting position Setting item Setting position TINT SET CLOCK COLOR ON / OFF TIMER PICTURE WORLD CLOCK Refer to OPERATING INSTRUCTIONS [AV-20F475] BRIGHT DETAIL (4) INITIAL SETUP COLOR TEMPERRATURE HIGH Setting item Setting position NOISE MUTING LANGUAGE ENG. [AV-20F475] ESP.
  • Page 10 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 11: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION MEASURING INSTRUMENT AND FIXTURES (1) There are 2 ways of adjusting this TV : One is with the • DC voltmeter (or digital voltmeter) REMOTE CONTROL UNIT and the other is the • Oscilloscope conventional method using adjustment parts and •...
  • Page 12: Main Pwb

    ADJUSTMENT LOCATIONS CRT SOCKET PWB (SOLDER SIDE) TP-B TP-E CRT EARTH (BRAIDED ASS'Y) FRONT MAIN PWB MEMORY IC SPEAKER F901 IC702 FUSE IC201 POWER CORD DEG. COIL TP-E(GND) T111 IC421 1: X-RAY R927 DOWN 2: GND S401 3: X-RAY V CENTER SW TP-91(B1) IC851 T521...
  • Page 13 BASIC OPERATION OF SERVICE MODE SUB MENU 7.LOW LIGHT SERVICE MENU 1.V/C(S) 2.DEF(D) 3.SOUND(A) 4.OTHERS(F) 5.3L Y/C(LYC) 7.LOW LIGHT 8.HIGH LIGHT 9.VCO 11.I2C BUS 12.SYSTEM(SYS) SELECT BY EXIT BY EXIT OPERATE BY BRIGHT 1.V/C(S) 8.HIGH LIGHT 4 : 3 BRIGHT 2.DEF(D) 9.VCO 4 : 3...
  • Page 14 4.6.1 TOOL OF SERVICE MODE OPERATION Operate the SERVICE MODE with the REMOTE CONTROL UNIT. 4.6.2 SERVICE MODE ITEMS In general, basic setting (adjustments) items or verifications are performed in the SERVICE MODE. 1. V/C (S) This sets the setting values of the VIDEO circuit. 2.
  • Page 15 4.6.6 SERVICE MODE SETTING 1. V/C(S), 2. DEF(D) 7. LOW LIGHT • Press [CH+] / [CH-] key The settings for LOW LIGHT is described in the WHITE For scrolling up/down the adjustment item. BALANCE page of ADJUSTMENT PROCEDURE. • Press [VOL+] / [VOL-] key NOTE: For scrolling up/down the data values.
  • Page 16 INITIAL SETTING VALUE OF SERVICE MODE (1) Adjustment of the SERVICE MODE is made on the basis of the initial setting values ; however, the new setting values which set the screen in its optimum condition may differ from the initial setting. (2) Do not change the initial setting values of the setting items NOT LISTED IN ADJUSTMENT PROCEDURE.
  • Page 17 Initial setting value Setting Variable item range EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT) ASY SHRP 0 ~ 7 BPF FØ 0 ~ 1 KILR OFF 0 ~ 1 KILR SEN 0 ~ 1 Setting Variable Initial setting value item range RGB MUTE 0 ~ 1 BLUE B...
  • Page 18 4.7.2 [2. DEF (D)] Initial setting value Setting Variable EXTERNAL item range 16:9 V FREQ 0 ~ 3 AFC GAIN 0 ~ 3 H POSI 0 ~ 31 H POSI+- -128 ~ +127 V PHASE 0 ~ 7 V PH+- -128 ~ +127 V SIZE 0 ~ 127...
  • Page 19 CCD POSI 0 ~ 255 Initial setting value Setting Variable CCD FREQ 0 ~ 255 item range AV-20F475 AV-N21F45 CCD CONT 0 ~ 63 SYS01 VIDEO IN 0 ~ 3 PUR WBCK 0 ~ 1 SYS02 VSM 0 ~ 1...
  • Page 20 ADJUSTMENT PROCEDURE 4.8.1 CHECK ITEM Measuring Item Test point Adjustment part Description instrument B1 VOLTAGE Signal TP-91(R927) (1) Receive the black and white signal. (color off) generator TP-E (IC421 (2) Connect the DC voltmeter to the TP-E and TP-91. Heatsink) (3) Confirm that the voltage is DC134V±2V.
  • Page 21 4.8.4 DEFLECTION CIRCUIT • 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. Measuring Item Test point...
  • Page 22 Measuring Item Test point Adjustment part Description instrument H. SIZE / Signal [2.DEF (D)] • V. SIZE / V. POSITION adjustment should be finished. generator D03: H POSI (1) Receive a cross-hatch signal. H. POSITION / SIDE PIN D15: H SIZE (2) Select 2.DEF(D) from the SERVICE MODE.
  • Page 23 4.8.5 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument WHITE Signal [1.V/C (S)] (1) Receive the black and white signal ( color off ). generator S01: BRIGHT (2) Set the VIDEO STATUS to STANDARD. BALANCE (LOW LIGHT) S11: R CUTOFF (3) Set the COLOR TEMPERATURE to LOW.
  • Page 24 Measuring Item Test point Adjustment part Description instrument WHITE Signal [1.V/C (S)] (1) Receive the black-and-white signal (color off). generator S14: R DRIVE (2) Set the VIDEO STATUS to STANDARD. BALANCE (HIGH LIGHT) S15: B DRIVE (3) Set the COLOR TEMPERATURE to LOW. Remote (4) Select the 1.V/C (S) from the SERVICE MODE.
  • Page 25 4.8.6 MTS CIRCUIT Measuring Item Test point Adjustment part Description instrument MTS INPUT Remote [3.SOUND (A)] (1) Receive any broadcast. control unit A01: IN LEVEL (2) Select the 3.SOUND (A) from the SERVICE MODE. LEVEL (3) Select the < A01 > (IN LEVEL). (4) Set the initial setting value of the <...
  • Page 26: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. 1-26 (No.YA052)
  • Page 27 JVC SERVICE & ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP. www.jvcservice.com(US Only) JVC CANADA INC. Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 (416)293-1311 (No.YA052) Printed in Japan...
  • Page 28: Parts List

    PARTS LIST CAUTION J 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. J The parts not indicated in this Parts List and those which are filled with lines --- in the Parts No. columns will not be supplied. J P.W.
  • Page 29 EXPLODED VIEW -1 ..............................3-3 EXPLODED VIEW PARTS LIST -2 ..........................3-4 EXPLODED VIEW -2 ..............................3-5 PRINTED WIRING BOARD PARTS LIST [AV-20F475/S] MAIN P.W. BOARD ASS'Y (SFJ-1011A-M2) ..................... 3-6 PRINTED WIRING BOARD PARTS LIST [AV-N21F45/S] MAIN P.W. BOARD ASS'Y (SFJ-1012A-M2) ....................3-10 REMOTE CONTROL UNIT PARTS LIST (RM-C1258G-1H) ..................
  • Page 30: Exploded View Parts List -1

    EXPLODED VIEW PARTS LIST -1 Ref.No. Part No. Part Name Description Local LC32242-001A-A RC LENS CM48006-010-C JVC MARK GQ30025-002A-A CONTROL KNOB GQ10063-003B-A FRONT CABINET ASSY Inc.No.101-104 AV-20F475/S GQ10063-004A-A FRONT CABINET ASSY Inc.No.101-104 AV-N21F45/S GQ20006-001B-A DOOR CM48229-00A-C DOOR LATCH LC32240-001A-A POWER KNOB...
  • Page 31: Exploded View Parts List -2

    2m BLACK LC20106-001D-A POWER CORD CLAMP QYSBSFG4016Z TAP SCREW 4.0mm x 16mm(x7) QYSBSB3010Z TAP SCREW 3.0mm x 10mm(x4) GQ30032-001A-A RATING LABEL AV-20F475/S GQ20001-001A-A RATING LABEL AV-N21F45/S GQ30034-001B-A WARNING LABEL SFJ-1011A-M2 MAIN PWB Inc. CRT SOCKET PWB AV-20F475/S SFJ-1012A-M2 MAIN PWB Inc.
  • Page 32: Exploded View -2

    EXPLODED VIEW -2 CRT SOCKET PWB (Within MAIN PWB) T521 (No.YA052)3-5...
  • Page 33: Printed Wiring Board Parts List [av-20f475/s]

    PRINTED WIRING BOARD PARTS LIST [AV-20F475 MAIN P.W. BOARD ASS'Y (SFJ-1011A-M2) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local D688 MTZJ9.1C-T2 Z DIODE D705 1SS133-T2 DIODE IC101 M52342FP-X D751 LG22440 POWER/ON TIMER...
  • Page 34 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C273 NCB31HK-103X C CAPACITOR 0.01uF 50V K C667 NCB31HK-472X C CAPACITOR 4700pF 50V K C274 NDC31HJ-181X C CAPACITOR 180pF 50V J C668 QENC1HM-475Z BP E CAPACITOR 4.7uF 50V M C275 QETN1EM-476Z...
  • Page 35 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R104 NRSA63J-180X MG RESISTOR 18Ω 1/16W J R402 NRSA63J-103X MG RESISTOR 10kΩ 1/16W J R105 NRSA63J-270X MG RESISTOR 27Ω 1/16W J R403 NRSA63J-103X MG RESISTOR 10kΩ...
  • Page 36 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R718 NRSA63J-101X MG RESISTOR 100Ω 1/16W J R943 QRE121J-820Y C RESISTOR 82Ω 1/2W J R720 QRJ149J-1R0 UNF C RESISTOR 1Ω 1/4W J R991 QRZ9041-275 C RESISTOR 2.7MΩ...
  • Page 37: Printed Wiring Board Parts List [av-n21f45/s]

    PRINTED WIRING BOARD PARTS LIST [AV-N21F45 Ref No. Part No. Part Name Description Local MAIN P.W. BOARD ASS'Y (SFJ-1012A-M2) Ref No. Part No. Part Name Description Local D687 MTZJ9.1C-T2 Z DIODE D688 MTZJ9.1C-T2 Z DIODE D705 1SS133-T2 DIODE IC101 M52342FP-X D751 LG22440 POWER/ON TIMER...
  • Page 38 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C272 NCB31HK-103X C CAPACITOR 0.01uF 50V K C666 NCB31HK-223X C CAPACITOR 0.022uF 50V K C273 NCB31HK-103X C CAPACITOR 0.01uF 50V K C667 NCB31HK-472X C CAPACITOR 4700pF 50V K C274 NDC31HJ-181X...
  • Page 39 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R104 NRSA63J-180X MG RESISTOR 18Ω 1/16W J R402 NRSA63J-103X MG RESISTOR 10kΩ 1/16W J R105 NRSA63J-270X MG RESISTOR 27Ω 1/16W J R403 NRSA63J-103X MG RESISTOR 10kΩ...
  • Page 40 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R718 NRSA63J-101X MG RESISTOR 100Ω 1/16W J R943 QRE121J-820Y C RESISTOR 82Ω 1/2W J R720 QRJ149J-1R0 UNF C RESISTOR 1Ω 1/4W J R991 QRZ9041-275 C RESISTOR 2.7MΩ...
  • Page 41: Remote Control Unit Parts List (rm-c1258g-1h)

    4pcs in 1set CP30056-008-A POLY BAG CP30055-001-A TOP COVER QPA02503505 POLY BAG 25cm x 35cm RM-C1258G-1H REMOCON ------------ BATTERY R6P/AA(x2) BT-52006-2Q WARRANTY CARD AV-20F475/S LCT1532-001A-A INST BOOK English/French AV-20F475/S LCT1608-001A-A INST BOOK Spanish AV-N21F45/S BT-51034-1Q REGIST. CARD AV-20F475/S CM36042-00A-H ROD ANTENNA AV-N21F45/S...
  • Page 42 SCHEMATIC DIAGRAMS COLOR TELEVISION AV-20F475 AV-N21F45 BASIC CHASSIS CD-ROM No.SML200404 No.YA052 COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LTD. 2004/4...
  • Page 43: Standard Circuit Diagram

    AV-20F475 AV-N21F45 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 44 CONTENTS SEMICONDUCTOR SHAPES ..............2-2 BLOCK DIAGRAM ..................2-3 CIRCUIT DIAGRAMS ..................2-5 MAIN PWB CIRCUIT DIAGRAM ........................ 2-5 PATTERN DIAGRAMS .................2-9 MAIN PWB PATTERN ..........................2-9 CHANNEL CHART (US) ................2-11 CHANNEL CHART (CA) ................2-12 USING P.W. BOARD PWB ASS'Y name AV-20FA475/S AV-N21F45/S MAIN P.W.
  • Page 45: Block Diagram

    BLOCK DIAGRAM IC101 IC641 IF & DET MTS DECODE/AUDIO CONTROL TU001 AUDIO VOLUME IF AMP TUNER CONTROL DETECT DECODE SDA0 SCL0 TONE CONTROL LIMIT AMP SURROUND VIDEO DETECT EQ. AMP SDA0 SCL0 L3/R3 Y1/C1 INPUT 1 IC851 AV SW L1/R1 IC251 3-LINE Y/C SEP SDA0 SCL0...
  • Page 46 SPEAKER IC602 SPEAKER AUDIO OUT HEADPHONE AUDIO EXTL/EXTR MAIN PWB IC201 MICRO COMPUTER/CLOSED CAPTION DECODE/ VIDEO PROCESS/RGB PROCESS/ SYNC. SEP/DEF PROCESS Q301 B OUT Q311 CLOSED GENERATE R OUT CAPTION PROCESS DECODER Q321 G OUT BASE BAND PROCESS PROCESS Pb2/Pr2 CRT SOCKET CHROMA PROCESS...
  • Page 47: Circuit Diagrams

    DC ( V ) DC ( V ) DC ( V ) PIN NO. PIN NO. PIN NO. IC101 IC641 TU001 MAIN PWB ASS'Y(1/2) ADRS SFJ-1011A-M2: AV-20F475/S SFJ-1012A-M2: AV-N21F45/S 32.9 CRT SOCKET PWB Q001 CN00T R716 R768 R769 IC702 D370 AT24C08-20F475 MTZJ5.1B-T2...
  • Page 48 INPUT-3 HEADPHONE J007 J006 J005 CEMN072-003 CEMN065-002 CEMN065-001 QNN0282-001 QNN0281-002 QNN0281-003 IC751 J008 GP1UM281QK S751 S752 S753 S754 S755 S756 QNS0155-001 QSW0847-001 QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z QSW0619-003Z Q751 R687 R688 R758 R756 C688 1.2k C687 10/50 R689 R690 R804 10/50 C751 D687 D688...
  • Page 49 T521-7 T521-8 Q301-C Q311-C Q321-C 25 Vp-p 90 Vp-p 26 Vp-p 200 Vp-p 62 Vp-p 100 Vp-p 115 Vp-p 100 Vp-p MAIN PWB ASS'Y(2/2) SFJ-1011A-M2: AV-20F475/S SFJ-1011A SFJ-1012A SYMBOL QCZ9074 QCZ9073 C991 -103 -332 SFJ-1012A-M2: AV-N21F45/S QCZ9074 C992 IM-BW -103...
  • Page 50 PICTURE TUBE MODE DC ( V ) PIN NO. CRT SOCKET PWB ASS'Y SK351 IC421 SFJ-1011A-M2: AV-20F475/S SFJ-1012A-M2: AV-N21F45/S R302 R303 27.8 2WOMR 1.5k1/2W Q301 2SC4075/DE/YA11 R301 12.3 C302 27.9 330p5% C301 IC901 R305 R306 133.8 R304 3.3k R312 R313 2WOMR 1.5k...
  • Page 51: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN R903 Y855 Y854 R902 C909 W920 R907 R831 R802 J002 D903 D902 R908 R906 J004 W919 R803 R833 C910 D684 C683 Y686 R691 Y856 C699 Y685 D906 C907 W802 C831 Q681 W801 Q682 K922 J001 C696 C686 Y852...
  • Page 52 R534 R533 TU001 D522 R006 R532 R005 C833 R526 R531 D833 R938 C001 D526 C007 R003 R939 C832 D832 C004 R004 C006 D831 W508 C003 D521 C531 R936 C002 T521 D932 R541 R104 R528 C005 Y101 C526 C102 R105 C101 C525 Q101 R008...
  • Page 53: Channel Chart (us)

    CHANNEL CHART (US) MODE CHANNEL MODE CHANNEL TUNER TUNER BAND BAND BAND BAND CATV REAL DISP. CATV REAL DISP. W+35 W+36 W+37 W+38 W+39 W+40 W+41 W+42 W+43 W+44 W+45 W+46 W+47 W+48 W+49 W+50 W+51 W+52 W+53 W+54 W+55 W+56 W+57 W+58...
  • Page 54: Channel Chart (ca)

    CHANNEL CHART (CA) MODE CHANNEL MODE CHANNEL TUNER TUNER BAND BAND BAND BAND CATV REAL DISP. CATV REAL DISP. W+35 W+36 W+37 W+38 W+39 W+40 W+41 W+42 W+43 W+44 W+45 W+46 W+47 W+48 W+49 W+50 W+51 W+52 W+53 W+54 W+55 W+56 W+57 W+58...
  • Page 55 JVC SERVICE & ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP. www.jvcservice.com(US Only) JVC CANADA INC. Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 (416)293-1311 (No.YA052) Printed in Japan...

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