JVC AV-21BS26 Service Manual
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JVC AV-21BS26 Service Manual

JVC AV-21BS26 Service Manual

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Table of Contents

  • English

  • Unknown
    • Block Diagram
    • Circuit Diagrams
    • Main Pwb Circuit Diagram (1/4), (2/4)
    • Main Pwb Circuit Diagram (3/4), (4/4)
    • Main Pwb Pattern
    • Pattern Diagrams
    • Voltage Chatrs
    • Waveforms
    • Exploded View -1
    • Main P.w. Board Ass'y (Scw-1949A-H2)
    • Printed Wiring Board Parts List [Av-21Bs26]
    • Main P.w. Board Ass'y (Scw-1951A-H2)
    • Printed Wiring Board Parts List [Av-21Bx16/G, Av-21Bx16B/G]
    • Packing
    • Packing Parts List
    • Remote Control Unit Parts List (Rm-C1286-1H)

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SERVICE MANUAL
8
2006
YA443
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
COLOUR TELEVISION
AV-21BS26,
AV-21BX16
AV-21BX16B

TABLE OF CONTENTS

COPYRIGHT © 2006 Victor Company of Japan, Limited
,
/G
/G
BASIC CHASSIS
CW3
No.YA443
2006/8

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  • Page 1: Table Of Contents

    SERVICE MANUAL COLOUR TELEVISION YA443 2006 AV-21BS26, AV-21BX16 AV-21BX16B BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Contents Items AV-21BX16/G AV-21BS26 AV-21BX16B/G Dimensions (W × H × D) 59.8 cm × 47.6 cm × 47.7 cm Mass 22.0 kg TV RF System B, G, I, D, K, M Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43...

  • 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

    This function can enjoy an enhanced sound for wider touch. audience. AI ECO SENSOR This function can adjust TV screen contrast according to the brightness of your room. MAIN DIFFERENCE LIST Item AV-21BS26 AV-21BX16/G AV-21BX16B/G Cabinet colour Silver Silver Black Teletext...
  • Page 5 TECHNINAL INFORMATION 2.4.1 MAIN MI-COM (CPU) PIN FUNCTION Pin name Function Pin name Function VssP2 Not used VssC4 FbiSo Flyback input/sandcastle output V1.8C4 1.8V (Digital) Hout Horizontal output V3.3A3 3.3V VssComb VrefP_Sdac 3.3V (Positive) V5Comb VrefN_Sdac Vin/R2/Pr PIP R input VrefP_Sdac 3.3V (Negative) Uin/B2/Pb...
  • Page 6 Pin name Function Pin name Function 50 R1 Audio-R1 input 114 4.5/OTHER NTSC 4.43 detection 51 V3 Video V3 input 115 PROT Protect 52 C4 Not used 116 ECO_IN ECO sensor level detection 53 Audio2InL Not used 117 V1.8C1 1.8V (Digital) 54 Audio2InR Not used 118 DecV1V8...

  • Page 7: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE 3.1.1 REMOVING THE REAR COVER • Unplug the power cord. (1) Remove the 7 screws [A], and 2 screws [B]. (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 SPEAKER CRT SOCKET PWB (Within MAIN PWB) FRONT LED PWB (Within MAIN PWB) POWER CORD MAIN PWB SPEAKER REAR COVER Fig.1 1-8 (No.YA443)
  • Page 9 MEMORY IC REPLACEMENT • This model uses the 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. In other words, use the specific IC listed in "PRINTED WIRING BOARD PARTS LIST".
  • Page 10 Setting item Setting position CHANNEL AUTO PROGRAM TV channel automatically set VOLUME EDIT/MANUAL PRESET CH only PICTURE MODE BRIGHT COLOUR SYSTEM DISPLAY Indicated LANGUAGE ENGLISH TV/VIDEO TEXT LANGUAGE GROUP1 [AV-21BS26] CINEMA SURROUND VIDEO-2 SETTING COMPONENT BLUE BACK BEEP 1-10 (No.YA443)
  • Page 11 3.2.4 SERVICE MODE SETTING ITEMS Setting item Setting value 1. IF 1. VCO 2. DELAY POINT 2. V / C 1. SCREEN 2. CUTOFF(B/G) 3. WDR(R/G/B) 4. BRIGHT(TV/VDO 1/2/3) 5. CONT(TV/VDO 1/2/3) 6. COLOUR (TV/VDO1/2/3) 7. TINT(TV/VDO 1/2/3) 8. SHARP [Do not adjust] 9.
  • 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 MEASURING INSTRUMENT AND FIXTURES (1) There are 2 ways of adjusting this TV : One is with the (1) DC voltmeter (or digital voltmeter) REMOTE CONTROL UNIT and the other is the (2) Oscilloscope conventional method using adjustment parts and (3) HV voltmeter components.
  • Page 14 ADJUSTMENT LOCATION MAIN PWB ASS'Y (FRONT LED) CN10A S804 S802 J808 J807 J806 J809 S805 S803 S801 POWER SW CN00A FRONT S901 CN00S POWER CORD IC702 DEG COIL IC701 YOKE J801 J802 J803 J804 CN00C MAIN PWB ASS'Y CN00B CN00C CN00B TU001 UPPER : FOCUS...
  • Page 15 BASIC OPERATION OF SERVICE MODE 4.6.1 TOOL OF SERVICE MODE OPERATION Operate the SERVICE MODE with the REMOTE CONTROL UNIT. 4.6.2 SERVICE MODE ITEMS With the SERVICE MODE, various adjustments can be made, and they are broadly classified in the following items of settings. 1.IF This mode adjusts the setting values of the IF circuit.
  • Page 16 4.6.4 SERVICE MODE 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 (3) The " --- " means adjustment is not possible. (4) " 12.TWIN CONT " is displayed only in the models with PIP function. [2. V/C] * is variable values for adjustment. [AV-21BS26] Initial setting value Adjustment item Variable range COMPONENT(V-2) SECAM NTSC3.58 NTSC4.43 VIDEO 2...
  • Page 18 [AV-21BX16/G, AV-21BX16B/G] Initial setting value Adjustment item Variable range COMPONENT(V-2) SECAM NTSC3.58 NTSC4.43 VIDEO 2 525i 625i 1. SCREEN 0 ~ 63 2. CUT OFF 0 ~ 63(-32 ~ +31) (+0)* (+0)* 0 ~ 63(-32 ~ +31) (-3)* (-3)* CUT OFF 0 ~ 63(-32 ~ +31) THEATER 0 ~ 63(-32 ~ +31)
  • Page 19 [3. AUDIO] *This submenu is for display only, no adjustment is required. [AV-21BS26] Function Item Setting value AUDIO 1. DC XO ADJ 2. NICAM LOWER ERR LIM 3. NICAM UPPER ERR LIM 4. A2 ID THR Function MODE Item 100Hz...
  • Page 20 [5. VSM W/B] Setting value Variable Setting item range BRIGHT SOFT STANDARD THEATER 1. BRIGHT -16 - 16 2. CONT -16 - 16 3. COLOUR -16 - 16 4. SHARP -16 - 16 5. HUE -16 - 16 Setting value Variable Setting item range...
  • Page 21 4.8.2 TUNER / IF CIRCUIT Measuring Item Test point Adjustment part Description instrument DELAY POINT Signal [1. IF] (1) Receive a black and white signal (colour off). (AGC) generator 2. DELAY POINT (2) Select 1. IF. (AGC TAKE-OVER) (3) Select <2. DELAY POINT>. Remote (4) Set the setting values of the setting items as shown control unit...
  • Page 22 Measuring Item Test point Adjustment part Description instrument V. POSITION Signal [4. DEF] PAL V. POSITION generator 1. V-SHIFT (1) Receive a circle pattern signal of vertical frequency 50Hz (PAL). Remote (2) Select 4. DEF from the SERVICE MODE. control unit (3) Select <1.
  • Page 23 Measuring Item Test point Adjustment part Description instrument V.LINEARITY Signal [4. DEF] PAL V. LINEARITY generator 12. V-S. CR (1) Receive a PAL crosshatch signal. 13. V-LIN (2) Select 4. DEF from the SERVICE MODE. Remote (3) Select <12. V-S.CR>. control unit (4) Set the initial setting value of <12.
  • Page 24 Measuring Item Test point Adjustment part Description instrument V. SIZE Signal [4.DEF] PAL V. SIZE generator 14. V. ZOOM (1) Receive a circle pattern signal of vertical frequency 3. V-SIZE 50Hz (PAL). Remote (2) Set the COMPRESS(16 : 9) to ON. control unit (3) Select 4.
  • Page 25 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 generator 4. H-CENT component terminal. (2) Select VIDEO-2 SET from the MENU and set Remote VIDEO-2 SET to COMPONENT.
  • Page 26 Measuring Item Test point Adjustment part Description instrument SUB BRIGHT Remote [2. V/C] (1) Receive a NTSC broadcast. control unit 4. BRIGHT (2) Set the PICTURE MODE to BRIGHT. (3) Select 2. V/C from the SERVICE MODE. (4) Select <4. BRIGHT>. (5) Set the initial setting value of <4.
  • Page 27 Measuring Item Test point Adjustment part Description instrument SUB TINT Remote [2. V/C] [Method of adjustment without measuring instrument] control unit 7. TINT PAL TINT (1) Receive a PAL broadcast. (2) Set the PICTURE MODE to BRIGHT. (3) Select 2. V/C from the SERVICE MODE. (4) Select <7.
  • Page 28 4.8.6 VSM PRESET SETTING Measuring Item Test point Adjustment part Description instrument VSM PRESET Remote [5.VSM W/B] (1) Select 5.VSM W/B from the SERVICE MODE. control unit 1. BRIGHT (2) Select the BRIGHT with the [OK] key. 2. CONT (3) Adjust the [MENU / ] key to bring the set values 3.
  • Page 29 4.8.7 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 (2) Loosen the retainer screw of the deflection yoke.
  • Page 30 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 31: 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 32 Victor Company of Japan, Limited Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA443) Printed in Japan...
  • Page 33 SCHEMATIC DIAGRAMS COLOUR TELEVISION YA443 2006 AV-21BS26, AV-21BX16 AV-21BX16B BASIC CHASSIS CD-ROM No.SML200608 No.YA443 COPYRIGHT © 2006 Victor Company of Japan, Limited 2006/8...
  • Page 34 AV-21BS26, AV-21BX16 , AV-21BX16B 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 35 MAIN PWB CIRCUIT DIAGRAM (3/4), (4/4) ....................2-7 PATTERN DIAGRAMS MAIN PWB PATTERN ..........................2-9 VOLTAGE CHATRS..................2-11 WAVEFORMS .................... 2-12 USING P.W. BOARD AV-21BX16/G P.W.B ASS’Y name AV-21BS26 AV-21BX16B/G MAIN P.W. BOARD SCW-1949A-H2 SCW-1951A-H2 SEMICONDUCTOR SHAPES TRANSISTOR BOTTOM VIEW...

  • Page 36: Block Diagram

    BLOCK DIAGRAM MAIN PWB IC701 MAIN MICRO COMPUTER/ IF VIDEO RGB SYNC DEF. PROCESS IC351 108,109 SCL1, SDA1 RGB OUT I 2 C 127,128 SCL0, SDA0 IC702 MICRO MAIN MEMORY COMPUTER DIGITAL SIGNAL PROCESS TU001 98,99 TUNER REMOTE PORT KEY_IN CRT SOCKET PEAKING SCAN ROUT...

  • Page 37: Circuit Diagrams

    CIRCUIT DIAGRAMS MAIN PWB ASS'Y(2/4) [FRONT LED] MAIN PWB (4/4) SHEET2 MAIN PWB CIRCUIT DIAGRAM (1/4), (2/4) SHEET1 ADJUSTMENT SCW-1949A-H2 [AV-21BS26] CONNECTOR (CRT SOCKET) CN10T SCW-1951A-H2 [AV-21BX16/G, AV-21BX16B/G] VIDEO-3 CN00C CN00T QGA2501F1-06 QJL001-064431-E INPUT IC801 GP1UE281QKVF IC302 REMOTECON RECEIVER D808...

  • Page 38: Main Pwb Circuit Diagram (3/4), (4/4)

    3.9K 47/35 L522 -1949A -1966A -1964A -1950A -1951A -1952A -1953A -1637A QQR1005-002 Y960 Y971 QUY160-125Y MAIN PWB ASS'Y(3/4) Y958 Y970 SCW-1949A-H2 [AV-21BS26] Y954 Y967 C530 R528 QUY160-150Y QCB32HK-561Z QGA7901 QGA7901 QGA7901 QGA7901 QGA7901 1/2W CN0PW QGA7901 QGA7901 QGAB801 C1-02 C1-02...

  • Page 39: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN FRONT (No.YA443)2-9 2-10(No.YA443)

  • Page 40: Voltage Chatrs

    VOLTAGE CHARTS <MAIN PWB> <MAIN PWB> (FRONT LED) (CRT SOCKET) <MAIN PWB> MODE MODE MODE MODE MODE MODE DC ( V ) DC ( V ) DC ( V ) DC ( V ) DC ( V ) DC ( V ) PIN NO.

  • Page 41: Waveforms

    WAVEFORMS -MAIN PWB- IC401-7 IC401-1 IC401-3 IC401-5 IC401-6 27Vp-p 30Vp-p 0.8Vp-p 1.0Vp-p 53Vp-p IC701-10 IC701-11 IC701-22 IC701-23 IC701-48 IC701-66 IC701-67 (0.2µs) (0.2µs) 2.3Vp-p 2.7Vp-p 1.0Vp-p 1.3Vp-p 2.0Vp-p 5.0Vp-p 3.0Vp-p IC701-74 IC701-85 IC701-86 IC701-87 1.2Vp-p 1.4Vp-p 1.4Vp-p 1.7Vp-p T522-2 T522-4 T522-6 T522-7 T522-8 T522-9...
  • Page 42 Victor Company of Japan, Limited Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA443) Printed in Japan...
  • Page 43 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 44 USING P.W. BOARD & REMOTE CONTROL UNIT ....................3-2 EXPLODED VIEW PARTS LIST -1 ..........................3-2 EXPLODED VIEW -1 ..............................3-3 PRINTED WIRING BOARD PARTS LIST [AV-21BS26] .................... 3-4 MAIN P.W. BOARD ASS'Y (SCW-1949A-H2) ....................3-4 PRINTED WIRING BOARD PARTS LIST [AV-21BX16/G, AV-21BX16B/G] ............. 3-8 MAIN P.W.

  • Page 45: Exploded View -1

    EXPLODED VIEW -1 DY01 CRT SOCKET PWB (Within MAIN PWB) FRONT LED PWB T522 (Within MAIN PWB) MAIN PWB RATING LABEL (No.YA443)3-3...

  • Page 46: Printed Wiring Board Parts List [Av-21Bs26]

    PRINTED WIRING BOARD PARTS LIST [AV-21BS26] MAIN P.W. BOARD ASS'Y (SCW-1949A-H2) 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 IC351 TDA6107AJF/N1 D715 MA111-X SI DIODE...
  • Page 47 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C554 QETN1EM-108Z E CAPACITOR 1000uF 25V M C779 QETN1HM-106Z E CAPACITOR 10uF 50V M C555 QFLC2AJ-103Z M CAPACITOR 0.01uF 100V J C780 NCB31CK-104X C CAPACITOR 0.1uF 16V K C571 QEZ0203-107...
  • Page 48 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R369 QRE121J-104Y C RESISTOR 100kΩ 1/2W J R734 NRSA63J-101X MG RESISTOR 100Ω 1/16W J R411 NRSA63J-222X MG RESISTOR 2.2kΩ 1/16W J R735 NRSA63J-101X MG RESISTOR 100Ω...
  • Page 49 Ref No. Part No. Part Name Description Local R957 QRE121J-332Y C RESISTOR 3.3kΩ 1/2W J R961 QRE141J-103Y C RESISTOR 10kΩ 1/4W J R962 QRL029J-223 OMF RESISTOR 22kΩ 2W J R963 NRSA63J-223X MG RESISTOR 22kΩ 1/16W J R964 NRSA63J-223X MG RESISTOR 22kΩ...

  • Page 50: Printed Wiring Board Parts List [Av-21Bx16/G, Av-21Bx16B/G]

    PRINTED WIRING BOARD PARTS LIST [AV-21BX16/G, AV-21BX16B/G] MAIN P.W. BOARD ASS'Y (SCW-1951A-H2) 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 IC351 TDA6107AJF/N1 D715 MA111-X SI DIODE IC401 LA78040N...
  • Page 51 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C554 QETN1EM-108Z E CAPACITOR 1000uF 25V M C779 QETN1HM-106Z E CAPACITOR 10uF 50V M C555 QFLC2AJ-103Z M CAPACITOR 0.01uF 100V J C780 NCB31CK-104X C CAPACITOR 0.1uF 16V K C571 QEZ0203-107...
  • Page 52 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R369 QRE121J-104Y C RESISTOR 100kΩ 1/2W J R734 NRSA63J-101X MG RESISTOR 100Ω 1/16W J R411 NRSA63J-222X MG RESISTOR 2.2kΩ 1/16W J R735 NRSA63J-101X MG RESISTOR 100Ω...
  • Page 53 Ref No. Part No. Part Name Description Local R957 QRE121J-332Y C RESISTOR 3.3kΩ 1/2W J R961 QRE141J-103Y C RESISTOR 10kΩ 1/4W J R962 QRL029J-223 OMF RESISTOR 22kΩ 2W J R963 NRSA63J-223X MG RESISTOR 22kΩ 1/16W J R964 NRSA63J-223X MG RESISTOR 22kΩ...

  • Page 54: Remote Control Unit Parts List (Rm-C1286-1H)

    Description Local R25-8566 BATTERY COVER PACKING PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local GG10285-012A-H PACKING CASE AV-21BS26 GG10282-044A-H PACKING CASE AV-21BX16G,AV-21BX16BG GG10422-001A-H CUSHION ASS'Y 5pcs in 1set GG30097-003A-H POLY BAG GG30096-001A-H POLY BAG ------------ BATTERY AA/R6 1.5V(x2)

This manual is also suitable for:

Av-21bx16/gAv-21bx16b/g

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