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SERVICE MANUAL
FLAT COLOUR TELEVISION
YA 10 200 476 6
AV-21MXP6/V,
AV-25MXP6/V,
AV-29MXP6/V
BASIC CHASSIS
CW3
[AV-21MXP6/V] [AV-25MXP6/V]
[AV-29MXP6/V]
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . .
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SPECIFICATION Contents Items AV-21MXP6/V AV-25MXP6/V AV-29MXP6/V Dimensions (W × H × D) 64.9 cm × 46.5 cm × 46.9 cm 72.8 cm × 53.6 cm × 47.6 cm 81.2 cm × 58.4 cm × 52.1 cm Mass 23.5 kg 32.0 kg 43.0 kg TV RF System B, G, I, D, K, M Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43 Stereo System PB STREO Teletext System - - - Receiving VHF Low 46.25MHz - 140.25MHz (AS0 - S6) Frequency VHF High 147.25MHz - 423.25MHz (S7 - S36) UHF 431.25MHz - 863.25MHz (S37 - C57) CATV Mid (X - Z+2, S1 - S10) / Sup
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SECTION 1 PRECAUTION 1.1 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. For continued protection, no changes should be dress in the high voltage circuit area. Where a short circuit made to the original design unless authorized in writing by has occurred, those components that indicate evide
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SECTION 2 SPECIFIC SERVICE INSTRUCTIONS 2.1 FEATURES DVD PICTURE MODE RETURN + This function can enhance the picture quality of DVD. The This function can set a channel frequently view to the Return screen can be made sharp or soft by this setting. Channel and you can view that channel at any time with one- touch. AUTO SIGNAL DETECT When input DVD signal to VIDEO-2, detect the input signal AI ECO SENSOR and change the input mode to VIDEO-2 automatically. This function can adjust TV screen contra
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2.3 TECHNINAL INFORMATION 2.3.1 MAIN MI-COM (CPU) PIN FUNCTION Pin Pin Pin name I/O Function Pin name I/O Function No. No. 1 VssP2 - GND 65 SVM O Not used 2 VssC4 - GND 66 FbiSo I Flyback input/sandcastle output 3 V1.8C4 I 1.8V (Digital) 67 Hout O Horizontal output 4V3.3A3I3.3V 68VssComb-GND 5 VrefP_Sdac I 3.3V (Positive) 69 V5Comb I 5V 6 VrefN_Sdac - GND 70 Vin/R2/Pr I PIP R input 7 VrefP_Sdac I 3.3V (Negative) 71 Uin/B2/Pb I PIP B input 8 VrefN_Sdac - GND 72 Yin/G2/Y I PIP G input 9 VrefP_Sda
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SECTION 3 DISASSEMBLY 3.1 DISASSEMBLY PROCEDURE [AV-21MXP6/V] 3.1.1 REMOVING THE REAR COVER • Unplug the power cord. (1) Remove the 2 screws [A], 7 screws [B] and 4 screws [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. 3.1.2 REMOVING THE MAIN PW BOARD • Remove the REAR COVER. (1) Slightly raise the both sides of the MAIN PWB (with BASS PWB connected) by ha
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[AV-21MXP6/X] FRONT CABINET D SPEAKER CRT SOCKET PWB (Within MAIN PWB) FRONT COTROL PWB (Within MAIN PWB) D SPEAKER MAIN PWB POWER CORD BASS PWB REAR COVER B A C Fig.1 (No.YA476)1-7
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3.2 DISASSEMBLY PROCEDURE [AV-25MXP6/V] 3.2.1 REMOVING THE REAR COVER • Unplug the power cord. (1) Remove the 11 screws [A] and 4 screws [B] as shown in Fig.2. (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. 3.2.2 REMOVING THE MAIN PW BOARD • Remove the REAR COVER. (1) Slightly raise the both sides of the MAIN PWB (with BASS PWB connected) by hand. (2) Withdraw the MAIN PWB backwa
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[AV-25MXP6/V] FRONT CABINET C SPEAKER CRT SOCKET PWB (Within MAIN PWB) FRONT COTROL PWB (Within MAIN PWB) SPEAKER C POWER CORD MAIN PWB BASS PWB REAR COVER A B Fig.2 (No.YA476)1-9
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3.3 DISASSEMBLY PROCEDURE [AV-29MXP6/V] 3.3.1 REMOVING THE REAR COVER 3.3.5 REMOVING THE SPEAKER • Unplug the power cord. • Remove the REAR COVER. (1) Remove the 16 screws [A] as shown in Fig.3. (1) Remove the 2 screws [G] as shown in Fig.3. (2) Withdraw the REAR COVER toward you. (2) Withdraw the SPEAKER backward. (3) Follow the same steps when removing the other hand CAUTION: SPEAKER. When reinstalling the rear cover, carefully push it inward after inserting the MAIN PWB into the REAR COVER gr
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[AV-29MXP6/V] [FRONT SIDE] E CONTROL BASE FRONT CABINET F CHASSIS BASE Fig.4 CRT SOCKET G PWB SPEAKER FRONT CONTROL PWB B CLAW (under side) G MAIN PWB Fig.4 SPEAKER AV TERMINAL BOARD CONTROL BASE D B CLAW (under side) BASS PWB CHASSIS BASE C POWER REAR COVER CORD A Fig.3 (No.YA476)1-11
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3.4 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". For its mounting location, refer to "ADJUSTMENT LOCATIONS". 3.4.1 MEMORY IC REPLACEMENT PROCEDURE 1. Power off Switch off the power and disc
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3.4.2 SYSTEM CONSTANT SETTING Setting value Setting item AV-21MXP6/V AV-25MXP6/V AV-29MXP6/V SYSTEM MULTI ←← COMB NO ← YES TILT NO ← YES SUPER BASS NO ←← TEXT NO ←← LANGUAGE E/V ←← SOUND PB ←← BILINGUAL NO ←← BLUE BACK MUTE NO ←← COLOUR AUTO NO ←← ECO SENSOR ECO ←← INTER CARRIER NO ←← SURROUND YES ←← PICTURE BOOSTER NO ←← COMPONENT YES ←← PIP YES ←← S INPUT YES ←← MAXX BASS YES ←← 3.4.3 SETTINGS OF FACTORY SHIPMENT 3.4.3.3 REMOTE CONTROL MENU OPERATION 3.4.3.1 BUTTON OPERATION (1) PICTURE SETTIN
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(3) FEATURE SETTING 3.4.4 SERVICE MODE SETTING ITEMS Setting item Setting position Setting item Setting value DVD MENU 1. IF 1. VCO 2. DELAY POINT AUTO SIGNAL DETECT ON DVD PICTURE MODE OFF 2. V / C 1.SCREEN (READ DATA) DVD THEATER STATUS OFF 2.CUTOFF / CUT OFF THEATER (B/G) 3.WDR (R/G/B) DVD SOUND MODE THEATER 4.BRIGHT (TV/VDO 1/2/3) ON TIMER OFF 5.CONT. (TV/VDO 1/2/3) OFF TIMER OFF 6.COLOUR (TV/VDO 1/2/3) 7.TINT (TV/VDO 1/2/3 /THEATER) CHILD LOCK OFF 8.SHARP (TV/VDO 1/2/3) COMPRESS (16:9) OFF
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3.5 REPLACEMENT OF CHIP COMPONENT 3.5.1 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. 3.5.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts. 3.5.3 REPLACEMENT STEPS 1. How to remove Chip parts 2. How to insta
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SECTION 4 ADJUSTMENT 4.1 ADJUSTMENT PREPARATION 4.3 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. (4) Signal generator (2) The adjustment using the REMOTE CONTROL UNIT is (Pattern generator : PAL/NTSC) made on the basis of the initial setting values. The (5) Remote control unit
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4.5 ADJUSTMENT LOCATION [AV-21MXP6/V, AV-25MXP6/V] MAIN PWB ASS'Y FRONT (FRONT LED) CN10A S804 S802 J808 J807 J806 J809 S805 S803 S801 POWER SW CN00A 41 FRONT S901 CN00S POWER PW CORD IC702 1 T DEG DEG COIL 6 IC701 DEF 12 YOKE HV 4 1 U 1 HVT BASS 41 PWB ASS'Y GND B1 J801 J802 J803 J804 3 1 CN00C MAIN PWB ASS'Y 61 CN00B CN00C CN00B TU001 UPPER : FOCUS 1. 5V 1. B1 2 I C 2. SCL0 2. NC LOWER : SCREEN 3. SDA0 3. GND 4. SCL1 5. SDA1 6. GND MAIN PWB ASS'Y (CRT SOCKET) (SOLDER SIDE) TOP T 1 6 TP-47G/R
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4.6 ADJUSTMENT LOCATION [AV-29MXP6/V] FRONT CONTROL PWB ASS’Y (1/2) FRONT CONTROL PWB ASS’Y (2/2) SPEAKER (L) SPEAKER (R) FRONT FRONT S805 S801 S803 J804 J803 J802 J801 S804 S806 S802 S901 W CN00S CNDEG CN002 CN001 PW POWER CORD DEG COIL ROTATION COIL MAIN PWB ASS’Y FRONT R CN001 CN00W IC702 T 1 8 IC701 12 DEF YOKE HV CN00C 6 1 1. 5V 1 2. SCL0 3. SDA0 61 HVT 4. SCL1 U BASS CN00X 5. SDA1 6. GND 1. B1 PWB ASS'Y 2. NC B1 GND 5V 3. X-RAY2 J805 J801 J802 J803 J804 4. X-RAY1 6 1 5 1 5. GND GND TU001 U
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4.7 BASIC OPERATION OF SERVICE MODE 4.7.1 TOOL OF SERVICE MODE OPERATION Operate the SERVICE MODE with the REMOTE CONTROL UNIT. 4.7.2 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. 2. V/C This mode adjusts the setting values of the VIDEO circuit. 3.AUDIO This mode adjusts the setting values of the multiplicity AUDIO circuit. [Do not adjust]
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4.7.4 SERVICE MODE FLOW CHART 1. IF SERVICE MENU SERVICE MENU IF SERVICE MENU 1. IF 2. V/C VCO (CW) MHz ***** 3. AUDIO 4. DEF TOO HIGH 5. VSM W/B 6. STATUS 1. VCO ABOVE REFERENCE 7. PLUG & PLAY (ON) JUST REFERENCE 2. DELAY POINT BELOW REFERENCE 1-7 : SELECT DISPLAY : EXIT TOO LOW ******* **** ***** ***** **** **** *** *** DELAY POINT AGC TAKEOVER ** 2. V/C Setting item 1.SCREEN (READ DATA) 8.SHARP (TV/VDO 1/2/3) V/C PAL 2.CUTOFF / CUT OFF 9.Y DELAY (TV/VDO 1/2/3/ 1. SCREEN HBC THEATER
