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akira CT-21CQS5CPT Service Manual

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Summary of Contents for akira CT-21CQS5CPT

  • Page 2 Model: Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 3: Table Of Contents

    CIRCUIT ADJUSTMENTS ............................ 16 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION ............23 STRUCTION BLOCK DIAGRAM......................... 23 CHASSIS DESCRIPTION ............................23 SERVICE DATA ..........................25 APPENDIX ............................38 CIRCUIT DIAGRAM PARTS LIST Please read this manual carefully before service. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 4: Safety Instructions And Maintenance

    4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode. So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 5: Safety Precaution

    When replacing safety components identified by the international hazard symbols on the circuit diagram and parts list, it must be the company-approved type and must be mounted as the original. 8. Keep wires away from high temperature components. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 6: Product Safety Notice

    TV near any heat sources such as radiators, heat registers, stove, or other apparatus that produce heat. 6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 7: Safety Symbol Description

    SAFETY SYMBOL DESCRIPTION Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 8: Maintenance

    6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 9: Specification

    : Colour / Sound system : PAL/SECAM BG/DK/I, NTSC-M (4.43 & 3.58) Programs Preset : 236 ( 0 ~ 235 ) Antenna Input : 75Ω (unbalanced) Power Source : 110 ~ 240V 50/60Hz Designs and specifications are subject to change without notice. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 10: Control & Function

    CONTROL & FUNCTION Front Panel Rear Panel The pictures showed are for function illustration. Please refer to the TV as the standard. Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 11 Remote Control Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 12: Mechanica Disassembling

    (picture tube grounding lead). 3. Disconnect Degaussing coil socket (KE). Picture tube socket, Deflection yoke connector (KDY). Speaker connectors (KL and KR), and 2 anode lead. 4. Remove chassis completely by sliding it straight back. Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 13 5. Properly install the degaussing coil and picture tube grounding lead on the picture tube. SeeFigure2. Note: If the Picture Tube is being replaced, mount the Degaussing Coi l on the picture tube. See following Figure1.Cabinet Back Removal Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 14: Adjustments

    •Slowly move the deflection yoke assembly forward or backward until a uniform green screen is obtained. •Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue raster until purities of the three rasters meet the requirement. Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 15 •Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection yoke assembly on the picture tube. •After fastening the three wedges, recheck overall convergence and ensure to get optimal convergence. Tighten the lamp screw holding the deflection yoke assembly. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 16: Circuit Adjustments

    •Power on the specific degausser and face it to the TV screen. •Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV .•Repeat the above steps until the TV is degaussed completely. Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 17 •After removing the back cover, look for the FBT on the main PCB. There should be a FCB (FOCUS) on the FBT. •Power on the TV and preheat it for 15 min. •Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 18 DVD VERTICAL SHIFT 5VOF/6VOF OSDVERTICAL SHIFT BLACK LEVEL OFFSET:R BLACK LEVEL OFFSET:G WHITE POINT R WHITE POINT G WHITE POINT B DRED DVD BLACK LEVEL OFFSET:R DGRN DVD BLACK LEVEL OFFSET:R DWPR DVD WHITE POINT R Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 19 * * * Optional 2 Optional 3 * * * Optional 4 Optional 5 Optional 6 Optional Optional 8 Optional 9 OP10 Optional 10 INIT EEPROM init Screen Voltage Rotate knob of the SCREEN on the FBT Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 20 OP_TURKISH OSD language: TURKISH OP_POLISH OSD language: POLISH OP_BULGARIAN OSD language: BULGARIAN OP_ROMANIAN OSD language: ROMANIAN OP_CROATIAN OSD language: CROATIAN OP_HUNGARIAN OSD language: HUNGARIAN OP_UKRAIN OSD language: Ukrainian OP_ARABIC OSD language: ARABIC OP_FARSI OSD language: FARSI Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 21 OP-TUNER 1:TAF5-C4I21/ TAF5-C4I23 OP_TINT :PAL TINT Adjust OP_FMWS WINDOW OF SOUND PLL:+/-200KHZ OP_FMWS1 WINDOW OF SOUND PLL:+/-600KHZ OP_OSVE OP-FFI OP-SPEED Program quickly, 1:yes,0no OP-SPEED0 Program slowly, 1:yes,0no OP10 OP_AKIRA_LOGO LOGO:AKIRA OP_HBL OP_NTSC_TUNER 1:TAF5-U2F22 OP_CHILD_LOCK :CHILD LOCK Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 22 OP_BLANK BLANK OP_BLANK BLANK OP_BLANK BLANK OP_TEXT_KEY (remote-control unit)TEXT key available Notes: The data sheet may differ dependent on different models. The data sheet may differ dependent on different CRTs for the same model. Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 23: Structure And Chassis Function Description

    TFA9842AJ for audio power amplifying Thick-film IC STR-G5653 for power circuit adjustment and control. 2.2 The following features are available in the chassis: Color systems: PAL, NTSC Sound systems: D/K, B/G, I , M 236 programs preset AV stereo IIC bus control Electronic Hotel Biorhythm Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 24 S w i tc h- m od e pow er s u pp l y c on tr o l A 00 1 TAF5-C4I21/ IF 38 MHz tu ner TAF5-C4I23 T AF5- E4 I22 IF 38 .9 MHz tu ner T AF5-U 2F22 IF 45 .7 5MHz tu ner Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 25: Service Data

    ·OSD/Text gain reduction control ·Adjustable ‘wide blanking’ of the RGB outputs ·Horizontal synchronization with two control loops and alignment-free horizontal oscillator ·Vertical count-down circuit ·Vertical driver optimized for DC-coupled vertical output stages ·Horizontal and vertical geometry processing Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 26 Real-time packet 26 engine in Hardware for processing accented, G2 and G3 characters • Signal quality detector for video and WST/VPS data types • Comprehensive teletext language coverage Full Field and Vertical Blanking Interval (VBI) data capture of WST data Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 27 IF amplifier sensitivity (RMS ViVIF(rms) value) QSS sound IF amplifier sensitivity ViSIF(rms) d B V (RMS value) ViAUDIO(rms) external audio input (RMS value) external CVBS/Y input (peak-to-peak ViCVBS(p-p) value) ViCHROMA(p-p) external chroma input voltage (burst amplitude) Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 28 QSS versions (RMS value) selected CVBS output (peak-to-peak o(CVBSO)(p-p) value) I o(AGCOUT) tuner AGC output current range output signal amplitudes V oRGB(p-p) (peak-to-peak value) I oHOUT horizontal output current vertical output current (peak-to-peak I oVERT value) Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 29 BLOCK DIAGRAM Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 30 32 Automatic Volume Levelling / subcarrier reference output / AMOUT (2) sound IF input / AM output HOUT 33 horizontal output FBISO 34 flyback input/sandcastle output QSSO/AMOUT/ 35 QSS intercarrier output / AM output / external audio input Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 31 1.3 or Counter/Timer 1 input P1 .6/SCL port 1.6 or I C-bus clock line P1 .7/SDA port 1.7 or I C-bus data line P2.0/TPWM port 2.0 or Tuning PWM output P3.0/ADC0/PWM0 port 3.0 or ADC0 input or PWM0 output Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 32 Input clamps Volume control Standby and mute mode No on/off switching plops Low standby current High supply voltage ripple rejection Outputs short-circuit protected to ground, supply and across the load Thermally protected 2.3 Block diagram of TFA9842AJ Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 33 Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 34 3.3 Block diagram of TDA4863AJ and TDA4864AJ SYMBOL DESCRIPTION positive supply voltage 1 flyback generator output supply voltage 2 for vertical output ground or negative supply voltage V-OUT vertical output inverted input of differential input stage non-inverted input of differential input stage Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 35 The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be addressed on a single bus system. The A0 and A1 pins are no connects. Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 36 4.4 Memory Organization AT24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each, the 8K requires a 10-bit data word address for random word addressing. 4.4.5 Block Diagram Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 37 5.2 Block Diagram Functions Symbols Description Terminal Drain Terminal MOS FET drain Source Terminal MOS FET source Ground Terminal Ground Power supply Terminal Input of power supply for control O.C.P/F.B Over current/Feedback Input of over current detection signal Model no.:CT-21CQS5CPT.doc version 1.0...

  • Page 38: Appendix

    APPENDIX Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 40 R804 50620071250 CARBON RES. RT14-0.25W-1kΩJ R807 50620071260 CARBON RES. RT14-0.25W-2.2KΩJ R301 R302 R812 51124302JT0 CARBON RES. RT14-0.25W-3KΩJ R866 50620072640 CARBON RES. RT14-0.25W-150KΩJ R893 50620030800 M. OXIDE FILM RES. RJ14-0.25W-39KΩG R167 50620101360 OXIDE FILM RES. RY21-0.5W-2.2ΩJ R307 Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 41 VD461 50660091240 DIODE RG4A VD810 50660091200 DIODE MUR460RLG 614145408N0 DIODE BY254 VD801 61414540810 DIODE 1N5408 VD802 VD804 VD805 611001030V0 DIODE AK03 VD806 611001110T0 DIODE AU01Z VD807 VD808 VD814 62118150Y16 AUDION 3DG1815-Y V402 50650030770 AUDION 2PC1815Y V803 Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 42 VD434 84756002300 COIL INDUCTANCE HXT65 L433 8475600090B TLN0028A L432 84799028201B FLY BACK BSC59C(B) T400 L431 50390061810 TFA9842AJ/N1 N601 50390071520 L7805CV N802 50390070710 KA7805TU 50390070710 MC7805CT 50390070710 CW7805CS 67241780806 L7808CV N401 67241780806 KA7808TU 67241780806 MC7808CT 50390071640 CW7808CS Model no.:CT-21CQS5CPT.doc version 1.0...
  • Page 43 CARBON RES. RT13-0.166W-4.7KΩJ RP12 51113333JU0 CARBON RES. RT13-0.166W-33KΩJ RP13 5253F103Z10 CERAMIC RES. CT1-63V-08C-2F4-10NFZ CP12 52623010060 ELECTROLYTIC CAP. CD110X-16V-10μFM CP11 61512050R15 L.E.D FG5RD-1 VDP11A 67109138025 IR RECEIVER HRM380017 NP11A 67109138025 IR RECEIVER AT138A 67109138045 IR RECEIVER HS0038A2 RP15A Model no.:CT-21CQS5CPT.doc version 1.0...

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