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akira CT-21FD9M Service Manual

H-704v chassis
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SERVICE MANUAL
H-704V CHASSIS
CONTENTS
1. SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. GENERAL INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. INSTRUCTION MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8. IC DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9. EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10. SCHEMETIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
11. PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . 36
12. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . 37

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  • Page 1: Table Of Contents

    SERVICE MANUAL H-704V CHASSIS CONTENTS 1. SAFETY INSTRUCTIONS ......2 2. GENERAL INSTRUCTIONS ......3 3.
  • Page 2 • SAFETY PRECAUTION WARNING: Service should not be attempted by anyone unfamiliar with the necessary precaution an this receiver. The following are the necessary precaution to be observed before servicing. 1. Always discharge the picture tube anode to the CRT conductive coating before handing the picture tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled.

  • Page 3: Safety Instructions

    1. SAFETY INSTRUCTIONS 1-1 PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc.

  • Page 4: General Instructions

    2. GENERAL INSTRUCTIONS 2-1 CONVERGENCE MAGNET ASSEMBLY POSITIONING Convergence magnet assembly and rubber wedges need mechanical positioning following figure 2. FIG. 2 Rubber Wedges Location 2-2 COLOR-PURITY-ADJUSTMENT NOTE : Before attempting any purity adjustments, the receiver should be operated for at least 15 minutes.
  • Page 5 FIG. 3 2-3 CONVERGENCE ADJUSTMENTS NOTE : Before attempting any convergence adjutment, the receiver should be operated for at least 15 minutes. 2-3-1 CENTER CONVERGENCE ADJUSTMENT 1 . Receive a crosshatch pattern with a color bar signal generator. 2. Adjust the BRIGHTNESS and CONTRAST controls for a well defined pattern. 3.
  • Page 6 2-3-2 CONVERGENCE ADJUSTMENT NOTE : This adjustment requires Rubber Wedge Kit. 1. Loosen the clamping screw of deflection yoke to allow the yoke to tiIt. 2. Place a wedge as shown in figure(2) temporartily. (Do not remove cover paper on adhesive part of the wedge.) 3.

  • Page 7: Specifications

    3. SPECIFICATIONS ITEM SPECIFICATION REMARK 1) MODEL NO. H-704V 2) CHASSIS NO. VOLTAGE SYNTHESIZE (WITH REMOCON) 1) METHOD GENERAL 2) CHANNEL OF 100 CHS TUNING PROGRAM SYSTEM 3) REMOTE CONTROLLER 1) CCIR STANDARD B/G, D/K,I, M(option) 2) COLOR STANDARD PAL,SECAM, NTSC (option) 3) ANT.
  • Page 8 ITEM SPECIFICATION REMARK 1) SET - MENU USER CONTROL 2) REMOTE CONTR- CONTROLLER - CH UP OL & - CH DOWN ACCES- - VOL UP SORIES - VOL DOWN - TV/VIDEO SELECT POWER TV/AV/SAT(SAT:OPTION) MUTE CH UP SLEEP CH DOWN FUZZY VOL UP SOUND(STREO OPTION)

  • Page 9: Instruction Manual

    4. INSTRUCTION MANUAL HOW TO GET THE BEST SATISFACTION FROM YOUR NEW COLOR TV SET To get the best satisfaction with your new COLOR TV SET, please read carefully and follow the instruction in this guide. We recommend that you read it before turning on your TV for the first time. INSTALLATION ANTENNA Unless your TV is connected to a cable TV system or to a centralized antenna system, a good outdoor color TV...
  • Page 10 MAKE REFERENCE TO THE BELOW THE PICTURE ANTENNA JACK ROD ANTENNA 75-300 OHM COUPLING TRANSFORMER FROM 75OHM ANTENNA WITH CABLE OR CABLE TV SYSTEM TV SET OPERATION Generally, REMOTE CONTROLLER has all the functions of the TV for normal use. 4-2.
  • Page 11 4-3-2. TO SCAN THROUGH CHANNELS Press the CH UP/DOWN buttons on the PANEL or REMOTE CONTROLLER to find the channel you want to see. 4-4. TO ADJUST VOLUME To increase or decrease the volume, press the VOLUME UP/DOWN buttons on the PANEL or REMOTE CONTROLLER.
  • Page 12 Your TV will be turned off automatically after the set time. 00 ”, and the SLEEP FUNCTION does not operate in this state. The initial state of SLEEP mode is “ 4-5-3 MUTE FUNCTION MUTE button makes the sound off and displays an icon on the right top of the screen.
  • Page 13 4-5-7. Timer FUNCTION You can see the current time. 4-5-8. SOUND FUNCTION (STEREO MODEL ONLY) You can select MONO, STEREO and DUAL 1, DUAL 2 by press the SOUND button. 4-5-9. OK/DG BUTTON (DC POWER INPUT MODEL ONLY) DC POWER INPUT MODEL BELOW FUNCTION ITEM ADD. When the blue parts appear, you can clear the blue parts by press the OK key, but you can press the OK button just one time during the one minute.
  • Page 14 ITEM Press VOL. DOWN (MIN 0) Press VOL. UP (MAX.63) Brightness Darken the picture Brighten the picture. Contrast Decrease picture contrast Increase picture contrast. Colour Decrease shade of color Increase shade of color. Sharpness Soften the picture. Sharpen the picture. TINT item appears only when TV set receives the NTSC (play back only) signal.
  • Page 15 4-6-3. TIMER 1) Press Menu 2) Press CH UP/DOWN to select TIMER item, and press OK button. 3) Then, five items appear as following on the screen. 4) Press CH DOWN to select the item you want to change. 5) Press OK to change the item’s time value. 6) Press the 0-9 buttons.
  • Page 16 4-6-5. PRESET 1) Press Menu 2) Press CH UP/DOWN to select PRESET item, and press O.K 3) Then, items will appear as following on the screen. 4) Press VOL UP/DOWN to select the item you want to change. 5) Press CH UP/DOWN to change the item’s value. 6) To change other items, repeat step 4 and 5.
  • Page 17 2. Move 1) To move a memory channel to the other channel, press RED button. Then you can see the color is changed from green to yellow on the screen. 2) Select the other channel on the screen that you want to change by using VOL.UP/DOWN and CH.
  • Page 18 6) REVEAL Press “REVEAL” key to reveal hidden words e.q. quiz pages will hidden answers. Press the key again to make hidden words disappear. 7) HOLD When TELETEXT information exceeds more than one page, the display changes automatically to the next page. In rolling subpages, press “HOLD”...

  • Page 19: Troubleshooting

    5. TROUBLESHOOTING 5-1. NO POWER (NOT WORKING SMPS) CHECK THE VOLTAGE OF C804 130 ~ 380V CHECK THE VOLTAGE CHECK/REPLACE AT PIN4 OF STR6653 F801,D801,L801,R802 ABOUT 12V CHECK/REPLACE CHECK/REPLACE I801(STR6653)AND R803,D802,R837 THE SECONDARY PART OF POWER CIRCUIT *R803A(ONLY DC) - 18 -...
  • Page 20 5-2. NO RASTER & PICTURE CHECK IF HEATER ELEMENT IS LIGHTING CHECK THE HEATER VOLTAGE INCREASE THE SCREEN CHECK /REPLACE VOLTAGE OF FBT R415 RETRACE LINE SCREEN IS BLACK IS VISIBLE CHECK/REPLACE CHECK THE WAVEFORM T402(FBT) AT PIN42 OF I102 SC562(CRT SOCKET) CHECK THE WAVEFORM CHECK/REPLACE...
  • Page 21 5-3. NO VERTICAL DEFLECTION CHECK THE VOLTAGE AT PIN6 OF I301 CHECK THE WAVEFORM CHECK/REPLACE AT PIN46 OF I102 D402, R17 CHECK/REPLACE CHECK/REPLACE I301, D301 I102 5-4. NO TELETEXT CHECK THE WAVEFORM AT PIN12 OF I701 CHECK/REPLACE CHECK THE WAVEFORM I701 AT PIN36 OF I102 CHECK/REPLACE...
  • Page 22 5-5. NO SOUND (STEREO) CHECK THE VOLTAGE AT PIN2 OF I603, I604(SOUND IC) CHECK THE WAVEFORM CHECK/REPLACE AT PIN24, 25 OF I602 D807 CHECK/REPLACE CHECK THE SCL, SDA I603, I604 AT PIN8, 7 OF I602 CHECK THE VOLTAGE CHECK/REPLACE AT PIN6, 16, 46 OF I602 I701 CHECK/REPLACE CHECK/REPLACE...
  • Page 23 5-6. DON’T CATCH CANNEL CHECK THE VOLTAGE AT PIN3 OF THE TUNER (33V) CHECK/REPLACE CHECK THE VOLTAGE D101(DZ-33B) AT PIN6 OF TUNER(5V) R810, D805 CHECK/REPLACE CHECK THE SCL, SDA OF TUNER I402, D403 CHECK THE WAVEFORM CHECK/REPLACE AT PIN15 OF I701(AFT) I701, I702 WHEN SEARCHING CHECK/REPLACE...
  • Page 24 5-7. NO SOUND(MONO) CHECK THE VOLTAGE AT PIN2 OF I603, I604(SOUND IC) CHECK THE WAVEFORM CHECK/REPLACE AT PIN5 OF IM601 D807 CHECK/REPLACE CHECK THE WAVEFORM I603, I604 AT PIN30 OF I102 CHECK THE WAVEFORM CHECK/REPLACE AT PIN51 OF I701 I102 CHECK/REPLACE I701, IM601 - 23 -...

  • Page 25: Block Diagram

    6. BLOCK DIAGRAM - 24 -...

  • Page 26: The Method Of Adjustment For Chassis

    7. THE METHOD OF ADJUSTMENT FOR CHASSIS FLOW CHART TO ADJUST IN PRODUCT LINE NN5198K RESET (FACTORY 2 KEY) H-CENTER, V-SIZE , V-CENTER,V-LIN(FACTORY 2 KEY) SCREEN(SERVICE) / FOCUS (FACTORY 3 KEY) WHITE BALANCE (FACTORY 3 KEY) SUB BRIGHT (FACTORY 2KEY) 203.25Mhz(color bar signal) * SYSTEM IS PAL BG AFT(FACTORY 1 KEY)
  • Page 27 7-1. V-SIZE / V-CENTER / H-CENTER (F2) 7-1-1. V-SIZE ADJUSTMENT. - Select the V-SIZE by pressing CH UP/DOWN key - Adjust the V-SIZE by pressing VOL UP/DOWN key for approximately one-half inch over scan at top and bottom of picture screen. 7-1-2.
  • Page 28 7-5. AFT ADJUSTMENT (F1 key) - Receive the RF color bar signal. Select the AFT mode, and then press the vol up/down key Select the OK 7-6. AGC ADJUSTMENT (F1 key) - Receive the RF color bar signal. - Strength of input signal control 67dBu. - Select the AGC POINT mode, and then adjust a AGC POINT to 2.0 - Select the AGC AUTO mode, and then press the vol up/down key - AGC is arranged automatically...
  • Page 29 LANGUAGE (TTX OPTION) Select the Character set mode, (LANGUAGE) Character set Character group Recommended for the languages Latin West Europe German/English/Skandinavian/ltalian/French Icelandic/Spain/Portugeses/Turkish Latin East Europe Polish/Czech/Romanian/Hungarin Solvenian/Croatian lettish/Lithuanian Estonian Cyrillic Cyrillic Russian/Byellorussian/Ukranian Greek Greek Greek Arabic Arabic Arabic Hebrew English&French inarabic countries Farsi Farsi Farsi...

  • Page 30: Ic Description

    8. IC DESCRIPTION 8-1. SDA555XFL VIDEO1/H VIDEO2/L VOLUME S/SW F/SW RESET(MSP) NTSC(H)/PAL SW AUDIO MUTE VDD 2.5V VDD 3.3V VDD 3.3V VDD 2.5V CVBS BLANK/CDR VDD 2.5V SDA555XFL VSSA VDD 2.5V KEY IN1 VSSA KEY IN2 XTAL1 HS/SSC XTAL2 RESET ODD/EVEN VDD 3.3V IR IN...
  • Page 31 8-2. POWER IC(I801) : STR-G6653 • Function of Terminal Terminal Symbols Description Functions Drain terminal MOS FET drain Source terminal MOS FET source Ground terminal Ground Power supply terminal Input of power supply for control circuit Input of overcurrent detection signal and O.C.P/F.B Overcurrent/Feedback terminal constant voltage control signal.
  • Page 32 8-3. SOUND AMP IC(I603, I604) : TDA1905 8-4. VERTICAL IC(I301) : LA7841K - 31 -...
  • Page 33 8-5. MAIN IC(I102) : NN5198N - 32 -...
  • Page 34 8-6. STZRZO IC(I602) - 33 -...

  • Page 35: Exploded View

    9. EXPLODED VIEW...

  • Page 37: Schemetic Diagram

    10. SCHEMETIC DIAGRAM...

  • Page 39: Printed Circuit Board

    11. PRINTED CIRCUIT BOARD...

  • Page 41: Replacement Parts List

    12. REPLACEMENT PARTS LIST S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST 9C91100C02 A/V SHEET “2100,SIDE-AV01,EN,PVC,433U” 1 EA M0116B 5CU13DYS01 ANT ADAPTOR YSC-T-108 1 EA 100A 5CL9100002 ANT-ROD DIPOLE 700 3STEP 1 EA 100B 5ND11R6PNN BATTERY R6P(AAM) 1.5V 2 EA 100E 8C819CKC04 BOX CABINET...
  • Page 42 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST CSS1C101MT C ELECTRO 16V 100uF RSS 17 EA “C104,C109,C118,C122,C137,” “C139,C153,C251,C255,C263,” “C270,C703,C772,C773,C776,” “C815,CV130” CSS1C221MT C ELECTRO 16V 220uF RSS 2 EA “C414,CV02” CSS1C331MT C ELECTRO 16V 330uF RSS 1 EA C816 CSS1C471MT C ELECTRO 16V 470uF RSS 3 EA...
  • Page 43 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST “C635,C702,C818” CXM2A102KT C MYLAR 100V 1000pF K 1 EA C306 CXM2A272KT C MYLAR 100V 2700pF K 2 EA “C611,C612” CMP2G274JD C MYLAR MPP 400V 0.27uF J 1 EA C407 CPP3C103JD C MYLAR PP 1.6KV 0.01uF J 1 EA C404...
  • Page 44 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST DDRU3AM-FN DIODE RECT-FAST RU3AM-B1 1 EA D805 DD1N4148-T DIODE SW 1N4148 11 EA “D123,D124,D125,D128,D129,” “D144,D253,D564,D601,D709,” D752 DZUZ-2.4BT DIODE ZENER UZ-2.4B 1 EA D702 DZUZ-3.0BT DIODE ZENER UZ-3.0B 1 EA D880 DZUZ-3.3BT DIODE ZENER UZ-3.3B 2 EA...
  • Page 45 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST 117 UTDA1905-N TDA1905 2 EA “I603,I604” 118 UPC17K1—N IC PHOTO PC-17K1 2 EA “I802,I803” 119 USDA55XX-N IC u-COM SDA555XFL 1 EA I701 120 7C21710C00 INDICATOR “2110,PMMA MILKY” 1 EA M0106 121 5CU21652V1 IR PREAMP HI-M652V1 1 EA...
  • Page 46 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST 149 RDD1201JNT R CARBON FILM 1/6W 1.2K J 4 EA “R105,R572,R574,R576” 150 RDD1501JNT R CARBON FILM 1/6W 1.5K J 4 EA “R127,R150,R809,R817” 151 RDD1801JNT R CARBON FILM 1/6W 1.8K J 1 EA R106 152 RDD1000JNT R CARBON FILM...
  • Page 47 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST 173 RDD4701JNT R CARBON FILM 1/6W 4.7K J 16 EA “R104,R130,R422,R709,R716,” “R717,R718,R722,R734,R748,” “R758,R759,R780,R781,R814,” 174 RDD4302JNT R CARBON FILM 1/6W 43K J 1 EA R309 175 RDD47R0JNT R CARBON FILM 1/6W 47 J 1 EA R103 176 RDD5601JNT...
  • Page 48 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST 201 ST2PK310SM SCREW TAPPING T2S WAS 3x10 MFZN(B) 1 EA M0200C 202 7C240VSN00 SHIELD CASE ET T0.3 1 EA 203 5CB11704VA SIDE PCB 92x27x1.6T(H-704V-AV) 1 EA 5001 204 33317G600N SILICON GREASE G-600 M0002 205 5CL61S730B...
  • Page 49 S / N PART NAME DESCRIPTION QUANTITY LOCATION LIST 231 4CJ22YMW05 WAFER YMW250-05 1 EA 232 4NWJP075DT WIRE COPPER AWG22 1/0.65 TIN COATING 79 EA “J03,J04,J105,J112,J119,” “J121,J125,J14,J149,J15,” “J151,J2,J20,J28,J39,” “J435,J441,J45,J457,J459,” “J460,J467,J474,J48,J482,” “J487,J490,J494,J5,J503,” “J504,J51,J513,J515,J517,” “J518,J522,J525,J554,J557,” “J575,J590,J593,J602,J603,” “J605,J611,J612,J613,J614,” “J615,J619,J623,J633,J634,” “J635,J637,J643,J650,J656,” “J657,J666,J667,J668,J669,” “J670,J672,J674,J675,J682,” “J683,J685,J689,J76,J80,” “J89,J90,J98,R705A”...
  • Page 50 MODEL : HT-1499MEG 704V Chassis Change Parts List OPTION GROUP : INCH OPTION : THAI 20” ASSEMBLY BEFORE Location Part Name Description Q’ty. Location Part Name Description Q’ty. Remark CPT ASSEMBLY 1000 4CT41TH14B A34JXV70X63 N30 1000 4CT41TH20B A48LGS30X83 N30 CPT ASSEMBLY 1000A 4CW8114H02 CRT GND ASSY...

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