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akira CT-21FGS1 Service Manual

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Summary of Contents for akira CT-21FGS1

  • Page 1 All manuals and user guides at all-guides.com...
  • Page 2 All manuals and user guides at all-guides.com CHASSIS: A21T01(TB1238) MODEL: CT-21FGS1 Model No: CT-21FGS1 Version 1.0...

  • Page 3: Table Of Contents

    CONTENT GERAL DESCRIPTION.......................... 4 SAFETY INSTRUCTION ........................6 CIRCUIT ADJUSTMENT........................7 FAULT FINDING TREES, DIAGRAMS & OVERVIEWS ..............14 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT ..............22 ELECTRICAL PART LIST ........................30 CIRCUIT DIAGRAM ..........................40 Model No: CT-21FGS1 Version 1.0...

  • Page 4: Geral Description

    All manuals and user guides at all-guides.com GENERAL DESCRIPTION AKIRA AKTP01 is a CTV monolithic chassis currently developed by AKIRA Co. It introduces a monolithic IC TB1238AN developed by Toshiba Co. To carry out all the small signal processing TB1238AN is a kind of IC used by color TV in PAL/NTSC system, which is controlled by Inter IC Bus.
  • Page 5 SCL1 N402(LA78040) MEMORY SDA1 (D902) ST24C08 POWER SUPPLY AC150-260V CIRCUIT Bridge +300V HORIZONTAL HORIZONT 50/60Hz Resistance FBT(T402) V512 V513 V511 Filte disturbance rectification DRIVE BSC25 T401 T501 VD515 C501 L502 VD503-VD506 V444 OUTPUT C507 V411 Model No: CT-21FGS1 Version 1.0...

  • Page 6: Safety Instruction

    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 7: Circuit Adjustment

    COLOUR PURITY ADJUSTMENT and CONVERGENCE ADJUSTMENTS procedures. ADJUSTMENT MODE B+ adjustment, TV signal receiving Item AKPH01 chassis Measuring No. 5 Service Remote Controller Equipment Preparation The set is turned on and work normally. Before Adj. No signal input Model No: CT-21FGS1 Version 1.0...
  • Page 8 Press V+ or V- key, to select SEARCH or AUTOMEMORY item, press P+ key to start searching. 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: CT-21FGS1 Version 1.0...
  • Page 9 6. Press R+ or R- (with the red block), G+ or G- (with the green block) and B+ or B- (with the blue block) key respectively, to adjust a horizontal line appeared to the white colour. 7. Press key again and changing back to normal screen. Model No: CT-21FGS1 Version 1.0...
  • Page 10 (which is according to the specification of factory’s adjustment) 3. Press R+ or R-, G+ or G- and B+ or B- key respectively to adjust the white balance of low light until the white balance of high and low light is good Model No: CT-21FGS1 Version 1.0...
  • Page 11 3. Item OSD position adjustment AKTP01 chassis Measuring No.1 and No.5 service remote controller Equipment Preparation Brightness, contrast and color should be set in standard before Adj. Model No: CT-21FGS1 Version 1.0...
  • Page 12 X (mute), DISP (display), PP and SLEEP key respectively, the relevant function should 6. Press be normal 7. Press S-OUT key on No.5 service remote controller to set default value that stored in E 2 PROM on the chassis for product shipment. Model No: CT-21FGS1 Version 1.0...

  • Page 13: Fault Finding Trees, Diagrams & Overviews

    Check V411,T402,T401, C515,C517,V411, Deflection coil VD552-VD555 115V Test the voltage of C415,C416,T402 D901 pin7 C412 Check T402,V411,R449 Check T402 Check L414,VD403,C411 4.5-5.5V Deflection coil CPU has sent the Check if V572 Power-off signal is broken down Model No: CT-21FGS1 Version 1.0...
  • Page 14 Check the voltage on the C992 CheckN902, TUN101 0-33V Check R102, C102, TUN101 Check N101,R968,R969, The voltage between VL and BH vary from N201,A101 0V to 9V or not when auto searching Check ,V975,D901, R973, R975 ,R975,R990,C971,C972,C991 Model No: CT-21FGS1 Version 1.0...
  • Page 15 Check if voltage on pin 48 of N201 is 4.6V Check R321,VD436,T402,R462,C452 Check C212,TUN101,N201 Observe if these is snow-noise-wave disturbance on the CRT via using “ Signal-input way ” by touching pin 18,19,20 of N201 Check R273,R271,R272,V602,V612,V622,N201 Model No: CT-21FGS1 Version 1.0...
  • Page 16 The voltage on pin 9,10,11of N252 Check VD552,R910,C700,T501,N701 Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 2 of N711 Check D901, N252,N203 Check SP301, SP302, N711 Model No: CT-21FGS1 Version 1.0...
  • Page 17 The deflection yoke on the CRT Check R908, C448, N402, N201 Abnormal Measuring the waveform on pin 2 of N402 Check N402 Normal Measuring the waveform on the deflection yoke Abnormal Check R442,C413,VD433,XZ411, deflection yoke Model No: CT-21FGS1 Version 1.0...
  • Page 18 The horizontal yoke is opened or not Repair CRT Whether “ XZ411” is opened Check if there is bad solder between XZ411, and the main board Check L414, VD403, C412,C415,especial in inductive components and connector Model No: CT-21FGS1 Version 1.0...
  • Page 19 Check R939,VD922 Check T501, VD553,R558 Check D901 Check the voltage on the emitter of V925 4.98V 4.98V Check the voltage on the positive pole of VD921 Check R937 4.98V =3.6V Check VD921, R933 Check R932,R937,V925 Model No: CT-21FGS1 Version 1.0...
  • Page 20 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 4 of FBT and N402 pin7 Check V922, V923,R914, VD436, R449, D901 Check FBT T402,N402 Model No: CT-21FGS1 Version 1.0...

  • Page 21: Various Parameters Of Integrated Circuit

    S B-Y IN SECAM B-Y signal input Y IN Luminance signal input H AFC Connecting RC network for horizontal AFC filter EXT.VIDEO/Y IN External video/luminance signal input DIG.GND Digital circuit ground TV.VIDEO IN TV. video signal input Model No: CT-21FGS1 Version 1.0...
  • Page 22 VCO VCC +9V supply input (IF VCO circuit) Limiter IN Sound IF signal input RIPPLE FILTER Ripple filer circuit EXT AUDIO External audio signal input FM DEC NF FM direct current negative feedback filter capacitor can Model No: CT-21FGS1 Version 1.0...
  • Page 23 Video mode selection control No.1 REMOTE Remote controller signal input H.SYNC Horizontal sync signal input SCL0 IIC-BUS SCL0 SDA0 IIC-BUS SDA0 S-ID S-VIDEO Detection SIF1 SIF data output1 SIF2 SIF data output2 5V power supply Model No: CT-21FGS1 Version 1.0...
  • Page 24 Decoder output 1 OUT2 Decoder output 2 Band control level input 1 Band control level input 2 Connect to ground +33V supply input pin OUT3 Decoder output 3 OUT4 Decoder output 4 +12V supply input pin Model No: CT-21FGS1 Version 1.0...
  • Page 25 The pin for input 4.43MHz of carrier wave for self-adjustment 4.43MHz CW IN circuit. ID SW The switch pin for selecting the ID detection mode. SECAM ID IN/OUT The interface pin to the main processor TB1238AN Model No: CT-21FGS1 Version 1.0...
  • Page 26 Vertical S correction/50 Hz VLIS Vertical line deflection of 60 Hz HIT0 50Hz SIZE ZOOM/WIDE V. HIT1 60Hz SIZE ZOOM/WIDE V. SECAM B-Y Black SECAM R-Y Black RAGC RF AGC PIF VCO center HAFC AFC gain Volume 25% Model No: CT-21FGS1 Version 1.0...
  • Page 27 Sub tint min(difference) Sub sharp center(3.58NTSC TV) Sub sharp center(3.58NTSC AV) Sub sharp center(OTHER TV) Sub sharp center(OTHER AV) SHPX Sub sharpness max(difference) SHPN Sub sharpness min(difference) TXCX Text RGB contrast max RGCN Text RGB contrast min Model No: CT-21FGS1 Version 1.0...
  • Page 28 SELF CNTC Self adjust CNTC initial data SELF TNTC Self adjust TNTCinitial data SELF COL Self adjust COL initial data OSD position Factory Data NOTE: The data provided in the form provides to consult only! Model No: CT-21FGS1 Version 1.0...

  • Page 29: Electrical Part List

    R106 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% R107 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% R217 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% R234 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% R241 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% R244 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% R247 D10B221J-T Carbon resistor RT13-1/6W-220Ω±5% Model No: CT-21FGS1 Version 1.0...
  • Page 30 R211 D10B152J-T Carbon resistor RT13-1/6W-1.5KΩ±5% R274 D10B152J-T Carbon resistor RT13-1/6W-1.5KΩ±5% R913 D10B152J-T Carbon resistor RT13-1/6W-1.5KΩ±5% R932 D10B152J-T Carbon resistor RT13-1/6W-1.5KΩ±5% W913 D10B152J-T Carbon resistor RT13-1/6W-1.5KΩ±5% W914 D10B152J-T Carbon resistor RT13-1/6W-1.5KΩ±5% R119 D10B222J-T Carbon resistor RT13-1/6W-2.2KΩ±5% Model No: CT-21FGS1 Version 1.0...
  • Page 31 R992 D10B103J-T Carbon resistor RT13-1/6W-10KΩ±5% R920 D10B123J-T Carbon resistor RT13-1/6W-12KΩ±5% R993 D10B123J-T Carbon resistor RT13-1/6W-12KΩ±5% R994 D10B123J-T Carbon resistor RT13-1/6W-12KΩ±5% R102 D10B153J-T Carbon resistor RT13-1/6W-15KΩ±5% R294 D10B153J-T Carbon resistor RT13-1/6W-15KΩ±5% R929 D10B153J-T Carbon resistor RT13-1/6W-15KΩ±5% Model No: CT-21FGS1 Version 1.0...
  • Page 32 R445 D10D1R8J-T Carbon resistor RT15-1/2W-1.8Ω±5% R442 D10D331J-T Carbon resistor RT15-1/2W-330Ω±5% R407 D10D102J-T Carbon resistor RT15-1/2W-1KΩ±5% R560 D10D332J-T Carbon resistor RT15-1/2W-3.3KΩ±5% R605 D10D332J-T Carbon resistor RT15-1/2W-3.3KΩ±5% R615 D10D332J-T Carbon resistor RT15-1/2W-3.3KΩ±5% R625 D10D332J-T Carbon resistor RT15-1/2W-3.3KΩ±5% Model No: CT-21FGS1 Version 1.0...
  • Page 33 C974 C2BF221K-T Ceramic capacitor CC1-06A-RH-50/63V-220pF-J C601 C2BF561K-T Ceramic capacitor CC1-06A-RH-50/63V-560pF-J C611 C2BF561K-T Ceramic capacitor CC1-06A-RH-50/63V-560pF-J C621 C2BF561K-T Ceramic capacitor CC1-06A-RH-50/63V-560pF-J C448 C2BF681K-T Ceramic capacitor CC1-06A-RH-50/63V-680pF-J C446 C2BF102K-T Ceramic capacitor CT1-06A-2B4-50/63V-1000pF-K C919 C2BF102K-T Ceramic capacitor CT1-06A-2B4-50/63V-1000pF-K Model No: CT-21FGS1 Version 1.0...
  • Page 34 E20C220M-T Electrolytic Capacitor CD110-16V-22uF -M C242 E20C220M-T Electrolytic Capacitor CD110-16V-22uF -M C558 E20C220M-T Electrolytic Capacitor CD110-16V-22uF -M C706 E20C220M-T Electrolytic Capacitor CD110-16V-22uF -M C716 E20C220M-T Electrolytic Capacitor CD110-16V-22uF -M C203 E20C470M-T Electrolytic Capacitor CD110-16V-47uF –M Model No: CT-21FGS1 Version 1.0...
  • Page 35 C227 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF –M C229 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF -M C443 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF –M C976 E20F4R7M-T Electrolytic Capacitor CD110-50V-4.7uF -M C411 E21H1R0M-T Electrolytic Capacitor CD110-160V-1uF -M C563 E20H101M Electrolytic Capacitor CD110-160V-100uF-M Model No: CT-21FGS1 Version 1.0...
  • Page 36 DR0001XX-T Diode IS1555/IN4148A VD611 DR0001XX-T Diode IS1555/IN4148A VD621 DR0001XX-T Diode IS1555/IN4148A VD630 DR0001XX-T Diode IS1555/IN4148A VD631 DR0001XX-T Diode IS1555/IN4148A VD904 DR0001XX-T Diode IS1555/IN4148A VD910 DR0001XX-T Diode IS1555/IN4148A VD911 DR0001XX-T Diode IS1555/IN4148A VD961 DR0001XX-T Diode IS1555/IN4148A Model No: CT-21FGS1 Version 1.0...
  • Page 37 RXC2216X-T Audion 2SC2216 V602 RXC2482X Audion 2SC2482 V612 RXC2482X Audion 2SC2482 V622 RXC2482X Audion 2SC2482 V444 RXC2383X-T Audion 2SC2383-O V512 RXC3807X Audion 2SC3807/2SC5070 V513 RXC5287X Audion 2SD1710/2SC4584/C5586 V102 RXC945XX-T Audion 2SC945/2SC1815/2SC536E V201 RXC945XX-T Audion 2SC945/2SC1815/2SC536E Model No: CT-21FGS1 Version 1.0...
  • Page 38 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) Z900 XC0004XX-A XTLO 8.0M(20P) Z280 XC0001XX-A XTLO 4.43M FXXX0020 IRICO 54SX380Y22-DC01 Model No: CT-21FGS1 Version 1.0...

  • Page 39: Circuit Diagram

    All manuals and user guides at all-guides.com CIRCUIT DIAGRAM Model No: CT-21FGS1 Version 1.0...