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akira 14RBS3WN Service Manual

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Summary of Contents for akira 14RBS3WN

  • Page 2 CHASSIS: TB1238 MODEL: 14RBS3WN...

  • Page 3: Table Of Contents

    CONTENT TB 1238 SERIES I C BUS CONTROL INSTRUCTION ............... 4 TYPICAL FAILURE ANALYSE......................6 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT ..............20 CIRCUIT DIAGRAM ..........................22 EXPLODED VIEW..........................23 Model No: 14RBS3Wn Version 1.0...

  • Page 4: Tb 1238 Series I 2 C Bus Control Instruction

    Sharpness maximum 59 MOD1 For 14 and 21 inches Mode 1 For 25 and 29 inches Mode 2 26 SHPN Sharpness minimum MOD2 0C Mode 2 27 TXCX 36 OSD contrast SELF Self-diagnosis VCO maximum Model No: 14RBS3Wn Version 1.0...
  • Page 5 If you find the threadlike disturbance on the top of picture, please adjust the VM 2 in the items and make its value come to 34. When E PROM does not work, please exchange the same model chip with data that the manufacture has already input. 2 Model No: 14RBS3Wn Version 1.0...

  • Page 6: Typical Failure Analyse

    TYPICAL FAILURE ANALYSE Three-None (no raster, no picture, no sound) This failure is mainly caused by big-power circuit such as power supply, horizontal scanning, vertical scanning. The detail checking and repairing steps are as follow. Model No: 14RBS3Wn Version 1.0...
  • Page 7 Test the voltage T401,C443,VD411 115V N 7 0 1 P i n 4 2 4.5-5.5V Check L407, L408, CPU has sent the Check if V706 Check T401,V432,R435 Check T401 VE601,VD411,C443 power-off signal is broken down Model No: 14RBS3Wn Version 1.0...
  • Page 8 Note: In the TV test, we mainly observe the noise wave on the CRT and listen to the noise voice liking as Ka..Ka from the loudspeakers. No picture Model No: 14RBS3Wn Version 1.0...
  • Page 9 2.38V Check R780,C715,N701,N201 The voltage on pin13 of N701 Observe if there is snow-noise-wave distur bance on the CRT via using Signal-input way by touching pin 18-20 of N201 Check R720,N701,R202 Check N201 Check R206-R208,VD202-VD204,XS601,N201 Model No: 14RBS3Wn Version 1.0...
  • Page 10 The repairing method (B1) may be referred without picture. The detail checking and repairing steps are as follow. Note: Before repairing, assure that the volume is on and the state of set is in TV. Model No: 14RBS3Wn Version 1.0...
  • Page 11 R 3 6 2 , V 3 0 3 , C 8 0 7 Check R562,C565,VD555,N301 Hear if there is the vo ice liking Ka...ka in the loudspeaker via using Signal-input way by touching pin9 of N301 Check V806,R750,R737 Check BL301,BL302,N301 Model No: 14RBS3Wn Version 1.0...
  • Page 12 The electron beam in the CRT only moves in the horizontal orientation so form this failure. (While checking horizontal and vertical deflection circuit s failure, we have better to use an oscilloscope.) Model No: 14RBS3Wn Version 1.0...
  • Page 13 Normal Abnormal Check N401 Measuring the waveform on the deflection yoke Normal Check R402,L401,R406 The deflection yoke on the CRT R 4 0 7 , C 4 0 9 , X S 4 0 1 Model No: 14RBS3Wn Version 1.0...
  • Page 14 Because the electron beam can not move in the horizontal orientation, the failure should be in the horizontal deflection circuit. We mainly check the open-circuit fault in horizontal deflection circuit. The detail checking and repairing steps are as follow: Model No: 14RBS3Wn Version 1.0...
  • Page 15 Check if there is bad solder between X S 4 0 1 , a n d t h e m a i n b o a r d Check L407,L408,VD411,C443, especial in inductive components and connector Model No: 14RBS3Wn Version 1.0...
  • Page 16 Television s remote-control system also needs reset circuit that can preset the values in internal register. The circuit around pin33 of N701 is called auto-reset circuit. If CPU detects errors in resetting, it will come to the state of programme protected. The detail checking and repairing steps are as follow: Model No: 14RBS3Wn Version 1.0...
  • Page 17 Check N701 Check T501 Check T501,VD556,C556 4.98V Check the voltage on the emitter of V705 <4.98V Check R741 <3.6V Check the voltage on the positive pole of VD 704 =3.6V Check R753,VD704 Check R754, V705, R752 Model No: 14RBS3Wn Version 1.0...
  • Page 18 CPU. We can judge this failure by measuring the wave of the character in an oscilloscope. The detail checking and repairing steps are as follow: Model No: 14RBS3Wn Version 1.0...
  • Page 19 Check the wave on the pin5 o f FBT Check V703,V704, R747 Check the wave on the pin7 of N401 R 7 4 8 , R 7 4 0 , R 7 3 5 Check FBT,N401 Check C720,R766,R736,C711,R738,R739,C461,R410 Model No: 14RBS3Wn Version 1.0...

  • Page 20: Various Parameters Of Integrated Circuit

    1.6V 3.2V 2.3V 2.8V FUNC. Y IN H AFC TV Y C IN Y IN VOL. 5.4V 3.8V 4.6V 8.2V 8.2V 9.1V 4.7V 5.6V FUNC. LOOP VC 01 Vc02 VOL. 4.3V 3.5V FUNC. A IN Model No: 14RBS3Wn Version 1.0...
  • Page 21 0.2V 0.2V FUNC. SCL1 SDA1 IF 1 IF 1 VIDEO C. Pin voltage of N401 (TA8427) VOL. 14.1V 27.2V 0.93V 0.83V 26.8V 1.33V FUNC. V OUT PUMP INPUT PHASE POWER PULSE OUT POWER COMPEN. SUPPLY Model No: 14RBS3Wn Version 1.0...

  • Page 22: Circuit Diagram

    6. This circuit diagram covers a basic or representative chassis by only. The re may be some components 5. Product safety should be considered when a component replacement is made in any area of a receiver. or partial circuit differences between the actual chassis and the circuit diagram. Model No: 14RBS3Wn Version 1.0...

  • Page 23: Exploded View

    EXPLODED VIEW Model No: 14RBS3Wn Version 1.0...