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akira CT-21CBP5CP Service Manual

Akira color tv (chassis:ex-1a) service manual
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Summary of Contents for akira CT-21CBP5CP

  • Page 2 Model: CT-21CBP5CP Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 3: Table Of Contents

    SERVICE DATA ..........................22 TECHNICAL DATA OF KEY ICs ......................... 22 WAVEFORMS OF KEY POINTS.......................... 40 SERVICE DATA OF KEY ICs ..........................42 APPENDIX ............................46 CIRCUIT DIAGRAM PARTS LIST Please read this manual carefully before service. Model no.: .CT-21CBP5CP.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-21CBP5CP.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-21CBP5CP.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-21CBP5CP.doc version 1.0...

  • Page 7: Safety Symbol Description

    SAFETY SYMBOL DESCRIPTION Model no.: .CT-21CBP5CP.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-21CBP5CP.doc version 1.0...

  • Page 9: Adjustments

    1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is obtained. 1.10 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-21CBP5CP.doc version 1.0...
  • Page 10 2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line. 2.1.6 Remember red and blue movement. Repeat steps 2.1.3-2. 1.5 until optimal convergence is obtained. Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 11 Generally, white balance adjustment is made with professional equipment. It’s not practical to get good white balance only through manual adjustment. For TVs with I C bus control, change the bus data to adjust white balance. Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 12: Circuit Adjustments

    4,1 After removing the back cover. Look for the FBT on the main PCB. There should be a FCB on the FBT. 4.2 Power on the TV and preheat it for 15 min. 4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture. Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 13 MENU1 is default. Use the POS+/- buttons to highlight an adjustment and the VOL+/- buttons to adjust it. The adjusted data are immediately output and stored in the EEPROM 6.2 Bus data in the S mode Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 14 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 15 6.3 Option set With remote control system software TDA935X, all options can be set in the SERVICE mode and stored in EEPROM. Data related to picture, sound and geometric adjustment are also stored in EEPROM. Function Option Bit Setting Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 16 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 17 Note: Do not change the data marked with “_” in “Data” column. Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 18 Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 19: Structure And Chassis Function Description

    STRUCTURE and CHASSIS FUNCTION DESCRIPTION 1. STRUCTURE BLOCK DIAGRAM Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 20: Block Diagram For Supply Voltage System

    2. BLOCK DIAGRAM FOR SUPPLY VOLT-AGE SYSTEM Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 21: Chassis Description

    2). The EX-1A1chassis series mainly use the following ICs and assemblies. Table 1 Key ICs and Assemblies Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 22: Service Data

    • Integrated chroma band-pass filter with switchable centre frequency • Only one reference (12 MHz) crystal required for the Controller, Teletext- and the colour decoder • PAL/NTSC or multi-standard colour decoder with automatic search system Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 23 Automatic selection between 525 WST/625 WST ¡ñutomatic selection between 625 WST/VPS on line 16 of VBI • Real-time capture and decoding for WST Teletext in Hardware, to enable optimized processor throughput • Automatic detection of FASTEXT transmission Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 24 WST Charater sets and Closed Caption Charater set in single device Function Difference Between The Varios IC Versions IC Version (TDA) 9350 9351 9352 9353 9360 9361 9362 9363 9364 9465 9366 9367 9380 9381 9382 9383 9384 9485 9386 9387 9389 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 25 3) Block Diagram Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 26 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 27 EHT/overvoltage protection input IFVO/SVO IF-PLL loop filter IF video output/selected CVBS output CVBSINT main supply voltage TV-processor (+8V) GND1 internal CVBS input CVBS/Y ground 1 for TV-processor CHROMA external CVBS/Y input AUDOUT/AMOUT chrominance input (SVHS) Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 28 IF input. This function is selected by means of SIF bit in subaddress 28J. 2) The reference output signal is only available for the CMB1/CMBO setting of 0/1. For the other settings of this pin is a switch output. Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 29 Fig.8 Pin Configuration (SDIP 64) Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 30 1.2 Electronic switch circuit HEF4053 Triple 2-channel Analog Multiplexer/Demultiplexer Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 31 Z, no V current will flow out of terminals Y, in this case there is no limit for the voltage drop across the switch, but the voltages at Y and Z may not exceed V or V Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 32 1.3 Sound power amplifier TDA7057AQ 2×8W Stereo BTL Audio Output Amplifier with DC Volume Control 3) Block Diagram Fig.12 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 33 (positive); includes II(sb) signal bias Idrive(neg) input power-stage (negative); includes II(sb) signal bias operating supply voltage VO(B) output voltage B ground input flyback supply voltage VO(A) output voltage A VO(guard) guard output voltage VI(fb) input feedback voltage Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 34 The ac signal setting is obtained by resistor networks And switches combined with operational Amplifiers. Thanks to the used bipolar/cmostechnology, Low distortion, low noise and dc stepping are Obtained. 3) Block Diagram Fig.15 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 35 4) Pin Connection Fig.16 5) Electrical Characteristics Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 36 1) The device is functionally good at Vs = 5V. a step down, on Vs, to 4V does’t reset the device. 2) BASS and TREBLE response: The center frequency and the response quality can be chosen by the external circuitry. Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 37 -Endurance 10 cycles -Data retention 40 years -ESD protection 4000 V on all pins -8 pin DIP/DSO packages • Available for extended temperature ranges -Industrial: -40 to +85 -Automotive: -40 to +125℃ 3) Block Diagram Fig.17 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 38 Full Over-Current Protection (no blanking) • Under-Voltage Lockout with Hysteresis • Over-Voltage Protection • Direct Voltage Feedback • Low Start-up Current (100μAmax) • Low-Frequency, Low-Power Standby Operation • Overmolded 5-Pin Package 2) Circuit Block Diagram Fig.18 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 39 4). Difference between STR-G5653 and STR-F6654 Different size: STR- F6654 is larger Different pin functions Different electric characteristics: Larger power output, switching current, avalanche-rated and internal allowable power consumption for STR-F6654 internal allowable power consumption for STR-F6654 Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 40: Waveforms Of Key Points

    WAVEFORMS OF KEY POINTS Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 41 Notes: ① The waveforms are only for reference. ② The waveforms may differ dependent on different models. Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 42: Service Data Of Key Ics

    VO (A) VO(guard) 10.0 9.7. VI(fb) Table 5 Function and Service Data of HEF4053BP (N402)’s Pins Digital Multimeter : Victor DT890D Reference Positive Nerative Function Description Voltage (V) Resistance Resistance (KΩ) (KΩ) Signal input 22.2 47.0 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 43 26.0 R_IN2 26.7 24.3. L_IN1 26.7 24.3 L_IN2 21.9 26.1 MUXOUT(L) 24.5 22.5 MUXOUT(R) 24.5 22.5 BIN(R) 28.0 26.1 BOUT(R) 28.0 21.0 BOUT(L) 28.0 20.8 TREBLE(L) 28.0 26.1 BIN(L) 30.5 28.0 TREBLE(R) 30.5 28.0 DIG_GND Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 44 0.01 27.6 21.2 VDRA 27.6 20.4 IFIN1 27.6 20.3 IFIN2 24.7 19.8 IREF 24.7 19.9 TUNERAGC 25.3 20.5 AUDEEM/SIFIN1(1) 27.7 21.5 DECSDEM/SIFIN2(1) GND2 27.1 20.7 VSSA 27.8 21.6 SECPLL SNDPLL/SIFAGC(1) 27.8 21.8 AVL/SNDIF/REFO/AMOUT(1) 27.2 20.4 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 45 11.3 VDDC 11.0 11.3 OSCGND 0.02 XTALIN XTALOUT RESET VDDP 11.0 11.3 P1.0/INT1 P1.1/T0 P1.2/INT0 18.2 17.5 Notes: ③ The data are only for reference. ④ The data sheet may differ dependent on different models. Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 46: Appendix

    APPENDIX Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 47 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 48 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 49 Model no.: .CT-21CBP5CP.doc version 1.0...

  • Page 50: Part List

    CARBON RES. RT13-0.166W-33KΩJ R894 50620071780 CARBON RES. RT13-0.166W-39KΩJ R810 R892 50620071470 CARBON RES. RT13-0.166W-120KΩJ R485 51113105JU0 CARBON RES. RT13-0.166W-1MΩJ R481A 50620071220 CARBON RES. RT14-0.25W-100ΩJ R165 R166 50620071370 CARBON RES. RT14-0.25W-680ΩJ R804 50620071250 CARBON RES. RT14-0.25W-1kΩJ R807 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 51 DIODE W05Z33C VD001A 61411075DT0 DIODE 1N4148 VD485 61411075DT0 DIODE 2CK75D 617100210T0 DIODE BAV21 VD896 611120RU210 DIODE 2CZRU2 VD302 VD491 VD811 VD471 61112RU4ZN0 DIODE 2CZRU4Z VD809 VD451 VD461 50660091240 DIODE RG4A VD810 614145408N0 DIODE BY254 VD801 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 52 84756002300 INDUCTOR HXT65 L433 84799025901B FLY BAK TRANS. BSC60C(B) T400 8782000020G CRT PCB JUG7.820.002 51113470JU0 CARBON RES. RT13-0.166W-47ΩJ R902 R912 R922 50620072160 CARBON RES. RT13-0.166W-270ΩJ R903 R913 R923 51113222JU0 CARBON RES. RT13-0.166W-2.2KΩJ R901 R911 R921 Model no.: .CT-21CBP5CP.doc version 1.0...
  • Page 53 67109138025 IR RECEIVER HRM380017 50390061810 TFA9842AJ/N1 N601 50390071520 L7805CV N802 50390070710 KA7805TU 50390070710 MC7805CT 50390070710 CW7805CS 67241780806 L7808CV N401 67241780806 KA7808TU 67241780806 MC7808CT 67241780806 CW7808CS 62622214000 AUDION TT2140LS-YB11 V431 50390069720 TDA4864AJ/V1 N300 67138565305 STR-G5653 N801 Model no.: .CT-21CBP5CP.doc version 1.0...

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