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akira 21WHS3 Service Manual

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  • Page 2 Model No: 21WHS3-Bn Version 1.0...

  • Page 3: Table Of Contents

    CHASSIS BLOCK DIAGRAM ......................15 FAULT FINDING TREES........................16 IC BLOCK DIAGRAM ......................... 23 MAIN CHIP INSTRUCTION........................ 24 FACTORY MENU ..........................45 EXPLODED VIEW AND PART NAME ....................48 BOM LIST ............................. 49 CIRCUIT DIAGRAM ..........................58 Model No: 21WHS3-Bn Version 1.0...

  • Page 4: Safety Notice

    Do not hold the CRT neck in case of causing damage to the CRT. 2. When the power cord needs replacing, use the same one as that provided by AKIRA factory. 3. Voltage exists between the hot and cold ground when TV is in operation. Install a separation transformer during repairing or connecting to any tester for the sake of safety.

  • Page 5: Product Safety Notice

    4. When replacing a burnout fuse, use the one with the same specifications as the original. 5. When replacing old wire, wind new one round the shaft to weld. When replacing components with safety in performance, use the same type as that specified by AKIRA and install it in the former way.

  • Page 6: General Description

    44 of OM8370 and then input to pin 1 and pin 12 of HEF4052BP. The sound signals from RF and AV are selected in it. The selected signal is output from Pin 3 and pin13, then input AN7522N (sound amplifier) or output from AV terminals. Model No: 21WHS3-Bn Version 1.0...

  • Page 7: Technical Specification

    Brightness &contrast Maximum ≤ 1.2mA Heater Voltage TV operate normally = 6.2Vac Heater Normal operating = 112Vdc Sound power RF signal input broadcasting at V = 6.3Vrms output 217.25MHz/BG/DK(1KHz) P = 5Watts X 2 Volume is maximum Model No: 21WHS3-Bn Version 1.0...

  • Page 8: General Specification

    Color picture tube 14” 21” 90 degree tube Remote control distance Video/Audio (L/R) 2set input YUV input External input/output S-Video input Video/ Audio (L/R) 1 set output C Bus Control Auto Search Off/On Timer Teletext Model No: 21WHS3-Bn Version 1.0...

  • Page 9: Safety Cautions For Products

    2m before disconnecting it from AC source. If color shading still persists, perform the COLOUR PURITY ADJUSTMENT and CONVERGENCE ADJUSTMENTS procedures. Model No: 21WHS3-Bn Version 1.0...

  • Page 10: Adjustment Mode

    Press V+ or V- key, to select SEARCH or AUTOMEMORY item, press P+ key to start searching. 2. Press P+ or P- key to inspect the set if there is channel skipped, if so, searching again by SEARCH as above described. Model No: 21WHS3-Bn Version 1.0...

  • Page 11: Adjustment Procedure

    Then the focus adj. VR is set as close low voltage side as possible. Stop the focus adj. VR at the point that focus is a bit worse at once, turn back to the left and then turn back to the right a little again. Model No: 21WHS3-Bn Version 1.0...
  • Page 12 RD/BD menu. b) adjustment RD/BD to get color temperature as x=282, y=292. c) sub-brightness adjustment (use stair case signal) select SB MENU. adjust SB to get the darkest step being out off. Model No: 21WHS3-Bn Version 1.0...
  • Page 13 Adjust Vamp value, to get 90% of vertical picture contents would be displayed on CRT. Adjust HSHIFT value, to get the picture horizontal center correspond to CRT horizontal center. Receive standard Crosshatch pattern signal for NTSC system, and again adjust. Model No: 21WHS3-Bn Version 1.0...
  • Page 14 4, Press POWER key to switch the set into standby status, at mean time the manufactory adjustment mode is cancelled 5, Press POWER key again, the set should work in normal receiving mode 6, Press (mute), QV (display), PP and TIMER key respectively, the relevant function should be normal Model No: 21WHS3-Bn Version 1.0...

  • Page 15: Chassis Block Diagram

    （ ST24C08 ） FBT(T402) BSC25 POWER SUPPLY 200V CIRCUIT AC150-260V Bridge Resistance V1512 、 V553 V1511 、 T 、 +300V 50/60Hz Filter C507 disturbance rectification 501 、 N504 +15V -15V C501 、 L502 VD503-VD506 110V Model No: 21WHS3-Bn Version 1.0...

  • Page 16: Fault Finding Trees

    VD522-VD529 Check V451,T451,T450, C455,C456,T451 Deflection coil 115V C467 Test the voltage of N301 pin1 Check T451,V451,R458 Check T451 Check L452,VD436,C461 4.5-5.5V Deflection coil CPU has sent the Check if V504 Power-off signal is broken down Model No: 21WHS3-Bn Version 1.0...
  • Page 17 Check the voltage on the C705 Check N703, A101 0-33V Check R707, C707, A101 Check R301,R302, The voltage between VL and BH vary from 0V to N301,A101 5V or not when auto searching Check ,V701,N301, R701, R701A ,R704,R705,C701,C705,C706 Model No: 21WHS3-Bn Version 1.0...
  • Page 18 Check if voltage on pin 31 of N301 is 1.7V ≥2V Check C361,C362,L361,N301 Check C323,A101,N301 Observe if these is snow-noise-wave disturbance on the CRT via using “ Signal-input way ” by touching pin 51,52,53 of N301 Check R381,R382,R383,V912,V922,V932,N301 Model No: 21WHS3-Bn Version 1.0...
  • Page 19 The voltage on pin 9,10of N121 12.5V Check VD521,R165,C522,T501,N161 Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 2,10 of N701 Check R126,N505, N121 Check SP161, SP162, N161 Model No: 21WHS3-Bn Version 1.0...
  • Page 20 The deflection yoke on the CRT Check R405, C408, N401, N301 Abnormal Measuring the waveform on pin 5 of N401 Check N402 Normal Measuring the waveform on the deflection yoke Abnormal Check R407,C408,R406,XS403, deflection yoke Model No: 21WHS3-Bn Version 1.0...
  • Page 21 Repair CRT The horizontal yoke is opened or not Whether “ XS403” is opened Check if there is bad solder between XS403, and the main board Check L452, VD436, C467,C455,especial in inductive components and connector Model No: 21WHS3-Bn Version 1.0...
  • Page 22 We can judge this failure by measuring the wave of the character in an oscilloscope. The detail checking and repairing steps are as follow: No OSD Check the wave on the pin 7 of FBT Check FBT T451 Check C482, R485, VD483, R487, N301 Model No: 21WHS3-Bn Version 1.0...

  • Page 23: Ic Block Diagram

    IC BLOCK DIAGRAM Fig 1: UOC-TDA9381 Illustration Model No: 21WHS3-Bn Version 1.0...

  • Page 24: Main Chip Instruction

    Pin 32 AVL filter Pin 33 Horizontal drive signal output, needs a resistor in series to +8V. Pin 34 Sandcastle output /flyback input. Pin 35 External audio input, this pin should be grounded in this chassis. Model No: 21WHS3-Bn Version 1.0...
  • Page 25 Pin 57, Pin 58, 12MHz crystal Pin 59 Pin 60 Reset. NC in this chassis Pin 61 +3.3V Pin 62 Pin 63 This pin is connected to the HEF4094. Functions expending. Pin 64 IR signal input. Model No: 21WHS3-Bn Version 1.0...
  • Page 26 Fig 2: HEF4052BP Illustration Model No: 21WHS3-Bn Version 1.0...
  • Page 27 – Z – Z – Z – Z – Z – Z NONE Notes: H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial Model No: 21WHS3-Bn Version 1.0...
  • Page 28 IC N402 <VERTICAL OUTPUT> LA78040 (or STV9302) Model No: 21WHS3-Bn Version 1.0...
  • Page 29 Model No: 21WHS3-Bn Version 1.0...
  • Page 30 Model No: 21WHS3-Bn Version 1.0...
  • Page 31 Model No: 21WHS3-Bn Version 1.0...
  • Page 32 Model No: 21WHS3-Bn Version 1.0...
  • Page 33 Model No: 21WHS3-Bn Version 1.0...
  • Page 34 Model No: 21WHS3-Bn Version 1.0...
  • Page 35 Model No: 21WHS3-Bn Version 1.0...
  • Page 36 Model No: 21WHS3-Bn Version 1.0...
  • Page 37 Model No: 21WHS3-Bn Version 1.0...
  • Page 38 Model No: 21WHS3-Bn Version 1.0...
  • Page 39 Model No: 21WHS3-Bn Version 1.0...
  • Page 40 Inverting input Pump up out VER output Output stage Vcc Non inv. Put Model No: 21WHS3-Bn Version 1.0...
  • Page 41 Fig 4 AN7522N Illustration Model No: 21WHS3-Bn Version 1.0...
  • Page 42 Model No: 21WHS3-Bn Version 1.0...
  • Page 43 Model No: 21WHS3-Bn Version 1.0...
  • Page 44 Fig 5: KA5Q0765RT Illustration Model No: 21WHS3-Bn Version 1.0...

  • Page 45: Factory Menu

    AV CFG* NTSC MX VIDEO OUT CVBS PIN5 NTSC VISION IF 38.9M ON/OFF ON/OFF ON/OFF ON/OFF SIF PREFER AUTO SOUND ON/OFF START ON ENGLISH ON/OFF ARABIC ON/OFF PERSIAN ON/OFF TURKISH ON/OFF FRANCE ON/OFF RUSSIA ON/OFF Model No: 21WHS3-Bn Version 1.0...
  • Page 46 AGC-TOP 0~63 AGC-SPEED FREQUENCY 50HZ 60HZ VSLOPE 0~63 VSHIFT 0~63 VAMP 0~63 VSCOR 0~63 HSHIFT 0~63 0~63 0~63 0~63 0~63 0~63 0~63 0~63 0~63 NOTE: The data provided in the form provides to consult only! Model No: 21WHS3-Bn Version 1.0...
  • Page 47 6) when E2PROM ADRESS =3, to adjust E2PROM VALUE may be changed size of LOGO. It’s range is from 0 to 3. 7) when E2PROM ADRESS =4~33, to adjust E2PROM VALUE may be changed character of LOGO. It’s range is from 0 to 95. Model No: 21WHS3-Bn Version 1.0...

  • Page 48: Exploded View And Part Name

    EXPLODED VIEW AND PART NAME Model No: 21WHS3-Bn Version 1.0...

  • Page 49: Bom List

    R933 D10B301J-T Carbon resistor RT13-1/6W-300Ω±5% R805 D10B331J-T Carbon resistor RT13-1/6W-330Ω±5% R916 D10B331J-T Carbon resistor RT13-1/6W-330Ω±5% R926 D10B331J-T Carbon resistor RT13-1/6W-330Ω±5% R936 D10B331J-T Carbon resistor RT13-1/6W-330Ω±5% R322 D10B391J-T Carbon resistor RT13-1/6W-390Ω±5% R308 D10B471J-T Carbon resistor RT13-1/6W-470Ω±5% Model No: 21WHS3-Bn Version 1.0...
  • Page 50 R540 D10B562J-T Carbon resistor RT13-1/6W-5.6KΩ±5% R701 D10B562J-T Carbon resistor RT13-1/6W-5.6KΩ±5% R1511 D10B562J-T Carbon resistor RT13-1/6W-5.6KΩ±5% R153A D10B822J-T Carbon resistor RT13-1/6W-8.2KΩ±5% R157A D10B822J-T Carbon resistor RT13-1/6W-8.2KΩ±5% R126 D10B103J-T Carbon resistor RT13-1/6W-10KΩ±5% R127 D10B103J-T Carbon resistor RT13-1/6W-10KΩ±5% Model No: 21WHS3-Bn Version 1.0...
  • Page 51 R513 D10C220J-T Carbon resistor RT14-1/4W-22Ω±5% R561 D10C270J-T Carbon resistor RT14-1/4W-27Ω±5% R486 D10C101J-T Carbon resistor RT14-1/4W-100Ω±5% R161 D10C222J-T Carbon resistor RT14-1/4W-2.2KΩ±5% R1526 D10C222J-T Carbon resistor RT14-1/4W-2.2KΩ±5% R485 D10C103J-T Carbon resistor RT14-1/4W-10KΩ±5% R1522 D10C153J-T Carbon resistor RT14-1/4W-15KΩ±5% Model No: 21WHS3-Bn Version 1.0...
  • Page 52 C931 C2BF331K-T Ceramic capacitor CC1-06A-RH-50/63V-330pF-J C803 C2BF471K-T Ceramic capacitor CC1-06A-RH-50/63V-470pF-J C805 C2BF471K-T Ceramic capacitor CC1-06A-RH-50/63V-470pF-J C812 C2BF471K-T Ceramic capacitor CC1-06A-RH-50/63V-470pF-J C814 C2BF471K-T Ceramic capacitor CC1-06A-RH-50/63V-470pF-J C824 C2BF471K-T Ceramic capacitor CC1-06A-RH-50/63V-470pF-J C826 C2BF471K-T Ceramic capacitor CC1-06A-RH-50/63V-470pF-J Model No: 21WHS3-Bn Version 1.0...
  • Page 53 E10C101M-T Electrolytic Capacitor CD110-10V-100uF –M C163A E20C100M-T Electrolytic Capacitor CD110-16V-10uF –M C172 E20C100M-T Electrolytic Capacitor CD110-16V-10uF -M C301 E20C100M-T Electrolytic Capacitor CD110-16V-10uF –M C307 E20C100M-T Electrolytic Capacitor CD110-16V-10uF –M C322 E20C100M-T Electrolytic Capacitor CD110-16V-10uF –M Model No: 21WHS3-Bn Version 1.0...
  • Page 54 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF –M C304 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF –M C325 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF –M C464 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF -M C703 E20F220M-T Electrolytic Capacitor CD110-50V-22uF -M C462 E20F470M-T Electrolytic Capacitor CD110-50V-47uF -M Model No: 21WHS3-Bn Version 1.0...
  • Page 55 N504 ! RX0001XX Photo electricity coupler PC817B/C VD1001 DL0008XX RED 5mm VD171 DR0001XX-T Diode IS1555/IN4148A VD461 DR0001XX-T Diode IS1555/IN4148A VD462 DR0001XX-T Diode IS1555/IN4148A VD482 DR0001XX-T Diode IS1555/IN4148A VD561 DR0001XX-T Diode IS1555/IN4148A VD734 DR0001XX-T Diode IS1555/IN4148A Model No: 21WHS3-Bn Version 1.0...
  • Page 56 BR ST24C08-W N503 IXXX0118 TA78M08 8V 稳 压 V1511 RXA1015X-T Audion 2SA1015Y/2SA608/2SA733Q V171 RXA1015X-T Audion 2SA1015Y/2SA608/2SA733Q V542 RXB892XX-T Audion 2SB892/2SB985T V308 RXC1674X-T Audion 2SC1674 V911 RXC2482X Audion 2SC2482 V921 RXC2482X Audion 2SC2482 V931 RXC2482X Audion 2SC2482 Model No: 21WHS3-Bn Version 1.0...
  • Page 57 PUSH SW.(L:5mm) SW1002 KXXX0101 Touch switch PUSH SW.(L:5mm) SW1003 KXXX0101 Touch switch PUSH SW.(L:5mm) SW1004 KXXX0101 Touch switch PUSH SW.(L:5mm) SW1005 KXXX0101 Touch switch PUSH SW.(L:5mm) SW1006 KXXX0101 Touch switch PUSH SW.(L:5mm) Z761 XC0004XX-A XTLO 12.0MHz(18P) Model No: 21WHS3-Bn Version 1.0...

  • Page 58: Circuit Diagram

    CIRCUIT DIAGRAM Model No: 21WHS3-Bn Version 1.0...

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