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COLOUR TELEVISION

SERVICE MANUAL

Models

HTN20R15

Features

BUS CONTROL

AUTO SEARCH 181 PROGRAM PRESETTING AND MEMOREY

ON-TIME,OFF-TIME,APPOINTING PROGRAMME

CCD & V-CHIP

SIDE/ BACK AUDIO/VIDEO INPUT

COLOR TELEVISION

Model: HTN20R15

Содержание HTN20R15

Страница 1: ...ION SERVICE MANUAL Models HTN20R15 Features I2 C BUS CONTROL AUTO SEARCH 181 PROGRAM PRESETTING AND MEMOREY ON TIME OFF TIME APPOINTING PROGRAMME CCD V CHIP SIDE BACK AUDIO VIDEO INPUT COLOR TELEVISION Model HTN20R15 ...

Страница 2: ...ts and Functions 11 7 Remote controller Functions 12 8 Program Diagram 13 9 Maintenance Service and Trouble Shooting 19 10 Circuit Diagram 23 11 Circuit Explanation 26 12 Adjustment 36 13 Exploded View 37 14 List of Parts 38 15 Damageable Parts List 54 16 Information of Resistors and Capacitors 55 CONTENT ...

Страница 3: ...5 Slow fading on off 26 Semitransparent menu 27 Non flshing channel changing 28 ZOOM 29 16 9 mode 30 Games 31 Calendar Y 32 Child lock 33 Multi functional lock Y 34 No picture listening Y 35 Background light 36 Auto timer on Y 37 CCD Y 38 SOFTWARE V CHIP Y 序号 FUNCTION 39 NO of built in speakers 1 40 Audio output power W 3W 41 Total power input W 90W 42 Voltage range V 120V 43 Power frequency Hz 60...

Страница 4: ... circuitry that might be inadvertently introduced during the service operation If any fuse or Fusible Resistor in this TV receiver is blown replace it with a specified one When replacing a high wattage resistor Oxide Metal Film Resistor over 1W keep the resistor 10mm away from PCB Keep wires away from high voltage or high temperature parts Due to the high vacuum and large surface area of the pictu...

Страница 5: ...ture 2 In order to prolong the using life of the TV set please place it on a ventilated place 5 Don t open the back cover otherwise it is possible to damage the components in the TV set and harmyou 3 Don t place the TV set in the sunshine or near heatsource 6 When the TV set isn t going to be used for long time or it is in thunder and lightening please pull out the plug fromAC outlet and the anten...

Страница 6: ...ube anode 2 Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device DVM FETVOM etc equipped with a suitable high voltage probe Do not test high voltage by drawing an arc 3 Discharge the picture tube anode only by a first connecting one end of an insulated clip lead to the degaussing or kine aquadag grounding system shield at the point where t...

Страница 7: ...n electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure of the assembly 3 Use only a grounded tip soldering iron to solder or unsolder ES devices 4 Use only an anti static type folder removal device Some solder removal devices not classified as anti static can generate electrical charges suf...

Страница 8: ...dering iron tip and solder the strand against the component lead until the solder melts c Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil and hold it there only until the solder flows onto and around both the component lead and the foil CAUTION Work quickly to avoid overheating the circuit board printed foil d Closely inspect the solder area a...

Страница 9: ...ransistor Device Removal Replacement Heat and remove all solder from around the transistor leads Remove the heat sink mounting screw if so equipped Carefully remove the transistor from the heat sink of the circuit board Insert new transistor in the circuit board Solder each transistor lead and clip off excess lead Replace heat sink Diode Removal Replacement Remove defective diode by clipping its l...

Страница 10: ...he end of the remaining copper pattern 3 Bend a small U in one end of a small gauge jumper wire and carefully crimp it around the IC pin Solder the IC connection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At other connections Use the fol...

Страница 11: ......

Страница 12: ...2 TV AV TV AV selection 3 VOL Decrease sound 4 VOL Increase sound 5 CH Select next lower channel 6 CH Select next higher channel 7 Power Power on off 8 Power Indicator 9 Sensor Windows 1 2 3 4 5 6 7 8 9 MENU TV A V MENU TV AV VOL VOL CH CH AV1 IN AUDIO VIDEO 10 11 10 VIDEO Video input 11 AUDIO Audio input Rear 6 Parts and Functions Parts and Functions ...

Страница 13: ... channel 01 125 6 RECALL Return to previous channel 7 Digit selector 8 TV AV Input selection 9 CCD ºCCD selection 10 MUTE Press key to activate deactivate sound 11 P STD Picture preference select button 12 DISPLAY Display receiving channel 13 EXIT ºExit TV menu 6 1 7 8 9 2 3 4 5 0 RECALL TV AV CCD EXIT MUTE P STD DISPLAY MENU CH VOL VOL CH 1 2 3 4 5 6 7 8 9 13 10 11 12 7 Remote Controller Function...

Страница 14: ...T key on the Remote control unit for factory used 2 The TEST will be displayed on the screen 3 Press digital key Mkey and corresponding on screen display will be appeared Some time PASSWORD on screen display will be appeared you need to input 828 4 Check the setting value of the SYSTEM default value of Table below If the value is different select items by CH CH keys and set value by VOL VOL keys 5...

Страница 15: ...ound output power 2W 10 X ray radiation value 0 1mR Hr 11 Voltage AC 100 130V 12 Energy consumption 90W 13 Net dimensions 616mmX474mmX437mm 14 Net weight 21 5Kg 2 User s instructions Note This TV set has been installed a caption decoder and control to US Federal Communications Commission Customized Power On setup This TV set is designed for customized initiation For detailed information see the Us...

Страница 16: ...rease TINT Tint increase Tint decrease 4 Press MENU button again to quit the main MENU SETUP 1 Press SETUP button the main menu will appear on the screen 2 Press CH or CH for LANGUAGE options The designated LANGUAGE will turn bright green 3 Press VOL or VOL for LANGUAGE options such as English Spanish and French 4 Receiving Press VOL button to move the icon to RECEPTION The TV set is preset AIR st...

Страница 17: ...ve the icon to SPECIAL and designate C CAPTION Then icon of C CAPTION turns to bright green When OFF is displayed C CAPTION is inactivated while when ON is displayed C CAPTION is activated 3 Press CH to move the icon to CC ON MUTE and the icon will turn bright green Press VOL or VOL button for adjustment of this function When OFF is displayed the item cannot display its function regardless of the ...

Страница 18: ...MENU will appear 5 When NO INFO RATING is selected press MENU button for option of UNBLOCK or BLOCK state 6 When NO RATED is selected press MENU button for option of UNBLOCK or BLOCK state 7 When ENTER PASSWARD is selected press MENU button then a dialog box will appear at bottom left corner of the screen and then a 4 digit password can be input Press RATING button again to return to the main menu...

Страница 19: ...ar on the screen 2 When BLOCK turns bright red and MENU button is pressed BLOCK will display BLOCK OFF and BLOCK ON Caution BLOCK OFF Indicating lock on status Regardless setup of TV RATING and MPAA RATING even V CHIP signals are received during TV programs this TV set dos not have the V CHIP function BLOCK ON Indicating lock off status When TV RATING and MPAA RATING are selected the TV set will h...

Страница 20: ...o see if 9v 5v is normal Check the control voltage of V552 or CPU power The failure of horizontal unit or N101 Normal Normal Normal Abnormal Checktosee103V etc voltageisnormal T esttoseeallterminal Resistanceofload Isnormal Checkswitch powerunit Check to see if rectifying tube is normal Change rectifying tube Check the Loader Abnormal Normal Abnormal Normal Abnormal Normal Abnormal Maintenance Ser...

Страница 21: ...mal Abnormal Normal Abnormal Abnormal Normal Normal Abnormal Abnormal Normal Check the voltage of all pins of XP902 is normal Heater Resistor open Check to see if b e voltage of V433 is existed Check the circuit from pin13 of N201 to H drive No raster Whether G2 voltage is normal Replace bad cmponents Check N201 Check N201 and H Vibration Check 12V power circuit Abnormal Normal Maintenance Service...

Страница 22: ...ae components There is trouble in V circuit There is trouble in V output circuit Yes No Make R451 open Multimeter is at range RΧ1K Red probe connects to ground Touch No 5 of N401 with black probe Bright line flashes for a moment Horizontal bright line Maintenance Service and Trouble Shooting Check Check the voltage at Pin2 of N401 ...

Страница 23: ...f there is snapping sound Power amplifier is normal Check N101 and external SIF circuit Check muting circuit and V601 V602 Check to see if 19V exists Check SIF circuit and speaker Inspect 19V power supply Replace CRT Check ircuit between Pin19 of N201 and XS202 No Yes Change V902 or weld V902 again Check to see if voltages of XP902 are normal Lack of red Check to see if V902 is open or not well we...

Страница 24: ...e Sound IF Amplifier Video and audio signal Processing RGB Output Circuits and H V Sync pulse segregation SAW Sound Power Amplifier Main Processor Infrared Receiver Remote Controller ROM Audio Video In Out Horizontal Scan Output Vertical Scan Output CRT Figure 5 ...

Страница 25: ...0 V101 1 6W 10 R104 1 6W 13K R105 1 6W 470 R106 25V 220µF C102 MTZJ5 1B DZ102 63V 0 1µF C101 1 6W 68K R261 1N4148 VD217 1 6W 9 1K R260 1 6W 1K R227 1 6W 9 1K R262 B4 12V C214 104 SYSTEM 1W 33 R110 LGA0203 100 L102 SDA SCL 1 6W 22 R103 SPEAKER INPUT INPUT 2 VCC 3 OUT 4 GND 5 VFB 6 OUT 7 VO 8 VI 9 TDA8357J N301 1 2W 1 R415 100V 33uF C304 LGA0305 10uH L306 MTZJ15C DZ303 63V 0 047µF C306 1 2W 1 5 R308...

Страница 26: ...PCB Diagram 3 PCB Diagram ...

Страница 27: ...cuits 3 AN7522 AN7523 Sound power amplifying integrated circuits A3 Electrical circuit analysis 1 Microprocessor and Small signal processing super monolithic integrated circuits OM8377 OM8377 is super large integrated circuit decoder containing intermediate image amplifying intermediate sound amplifying horizontal and vertical scan small signal processing color decoding hi pressure tracing and ove...

Страница 28: ...wtooth capacitor TUNER AGC 27 Tuner AGC output AUDEEM SIFIN1 1 28 Audio deemphasis or SIF input DECSDEM SIFIN2 29 decoupling sound demodulator or SIF input 2 GND2 30 ground 2 for TV processor SNDPLL SIFAGC 1 31 narrow band PLL filter or AGC sound IF AVL SNDIF REF0 AMOUT 1 32 Automatic Volume Levelling sound IF input subcarrier reference output audio deemphasis HOUT 33 horizontal output FBISO 34 fl...

Страница 29: ... West output or not and on some software control bits The valid combinations are given in table 1 2 the vertical guard function can be controlled via pin 49 or pin 50 the selection is made by means of the IVG bit in subaddress 2BH TABLE 1 IC version FM PLL version QSS version East West Y N N Y N Y CMB1 CMB0 bits 00 01 10 11 00 01 10 11 00 01 10 11 00 01 10 11 AM bits 0 1 0 1 Pin 20 AVL EWD AVL EWD...

Страница 30: ...e AN7523 is pin 1 to 9 AN7522 is pin 1 to 12 TDA8357 Function vertical output Symbol PIN Function Symbol PIN Function INPUT 1 2 INPUT VFB 6 VFB VCC 3 VCC VO 8 VO OUT 4 7 OUT VI 9 VI GND 5 GND 3 Test point Waveforms V401 C 5Vpp 0 9Vpp 1000Vpp H H 1Vpp V H H CRT KB CRT KG CRT KR 95Vpp 95Vpp 95Vpp H H H T801 PIN4 300Vpp 22Vpp H H V401 B 2 7Vpp Function TV AV MENU CH CH VOL VOL Voltage 0 0 4125 0 825 ...

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