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akira 14TDS3/VE Service Manual

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Summary of Contents for akira 14TDS3/VE

  • Page 2 CHASSIS: TB-1238 MODEL:14TDS3/VE...

  • 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: 14TDS3Ve Version 1.0...

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

    TB 1238 SERIES I C BUS CONTROL INSTRUSTION The way go into the factory mode Step 1. Press the numeric keys, switch to the position 12 Step 2. Press the numeric keys again, switch to the position 38 Step 3. Press the MENU key to call up the POS.LOCK menu Step4.
  • Page 5 No Item Value Meaning Item Value Meaning 28 RGCN 16 OSD contrast SELF Self-diagnosis AGC minimum 29 VMO VCD data 0 SELF Self-diagnosis bright center BRTC 30 VM 1 VCD data 1 SELF Self-diagnosis contrast center CNTC 31 HPOS Horizontal position SELF Self-diagnosis tint center TNTC...

  • 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: 14TDS3Ve Version 1.0...
  • Page 7 >130V Test the voltage of C461 115V <50V Check R552,V553,VD561 115V 300V Cut off W320 VD515,V511,V512,R555 N201 pin 8 voltage Voltage of C507 N0 variation Normal Test other voltage such Check if V513 collect-emitter as 180V,24V and 12V w a s b r o k e n d o w n Others...
  • Page 8 Two-None (no picture, no sound) The failure shows that the set does not display the picture but it has noise wave or blue background or OSD on the screen. This means that the circuits of power supply, horizontal scanning, vertical scanning and video amplification are normal and they are not considered in the repairing.
  • Page 9 No picture Check R576,C573,VD573,UPC574 Check if U101 has input signal Check RF signal input and adaptor Out of the 0-33V range Check the VT voltage when auto searching The voltage on the C573 =33V In the 0-33V range No variation Check the voltage on the C704 Check the MB voltage on U101...
  • Page 10 No sound In this kind of failure, first of all we should observe if there is the picture on the CRT . It proves the small signal circuit to work correctly with the picture on the CRT and we only check the sound signal processing and sound amplification circuit.
  • Page 11 Hear if there is the vo ice liking Ka...ka in the loudspeaker via using Signal-input way by touching pin53 of N201 Hear if there is the vo ice liking Ka...ka in the loudspeaker via using Signal-input way by touching pin1 of N201 Check C251,ZN04,R245 Check C253,C250,C251,N201 Hear if there is the vo ice liking...
  • Page 12 Only horizontal line in the middle of the screen If vertical deflection circuit does not work, this kind of failure will happen. In deflection yoke, there only has horizontal sweeping. The electron beam in the CRT only moves in the horizontal orientation so form this failure.
  • Page 13 Abnormal The waveform on the pin24 of N201 Normal Check N201,C216,C217,R260 The voltage on pin3 of N401 Abnormal Measuring the waveform on pin4 of N401 Check VD 401, N4 01 Normal Check R259,C403,N401 Abnormal Measuring the waveform on pin2 of N401 Normal Abnormal Check N401...
  • Page 14 Only vertical line in the middle of the screen This is a dangerous failure. It probable causes flashover and smoking inside the set. Don t let your TV work for a long time as this failure appears. Because the electron beam can not move in the horizontal orientation, the failure should be in the horizontal deflection circuit.
  • Page 15 Vertical line Repair CRT The horizontal yoke is opened or not Whether XS401 is opened 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: 14TDS3Ve Version 1.0...
  • Page 16 CPU does not work In television, remote-control system is similar with the computer system. In theory, it can work if it holds two conditions as follow: 1) The power supply: In general, it is 5V, the error is not above 10% and the disturbance pulse is as small as possible.
  • Page 17 N701 does not work <5V The voltage on the pin42 of N701 Observe if there is sine wave on t he pin31 Check the voltage on the positive pole of C566 pin32 of N701 with an oscilloscope <7V Check N705 Check Z701,N701 >5V Check alternant voltage...
  • Page 18 No OSD (On Screen Display) This failure is usually cause by the circuit of character generated and located. Most of reasons are that the horizontal and vertical flyback pulse signals do not come to 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: 14TDS3Ve Version 1.0...
  • Page 19 No OSD Observe if there is character wave on the pin14-17 of N201 Observe if there is character wave on the pin22-24 of N701 Check N201 Check R727-R732,C707- Observe if there is oscillating wave on the pin28-29 of N701 C 7 0 9 , C 2 1 0 - C 2 1 2 Check L701,N701 Check the horizontal and vertical flyback pulse on the pin26 and pin 27 of N701 Check N701...

  • Page 20: Various Parameters Of Integrated Circuit

    VARIOUS PARAMETERS OF INTEGRATED CIRCUIT A. Pin voltage of N201 VOL. 4.9V 3.5V 4.1V 2.4V 1.2V 4.2V FUNC. IF IN IF IN 2 IF AGC VOL. 2.4V 3.8V 9.1V 2.5V FUNC. R IN G IN B IN R OUT VOL. 2.4V 2.5V 6.1V...
  • Page 21 B. Pin voltage of N701 VOL. 4.8V 3.8V 3.8V FUNC. MUTE VOL1 VOL2 POWER BAND1 VOL. 2.4V 4.8V 4.9V FUNC. BAND2 SCL0 SDA0 AFC IN KARA KEY IN KEY IN 2 KARA KARA DATA VOL. 4.4V 4.8V FUNC. KARA OSD R OSD G OSD B OSD Y VOL.

  • Page 22: Circuit Diagram

    CIRCUIT DIAGRAM Pin Voltage of N701(Unit:V) Pin Voltage of N201(Unit:V) Pin Voltage of N401(Unit:V) Notice: 1. All resistance values are in ohms. k represents k . M represents M . k =10 . M=10 The values of the components indicated by a mark in this circuit diagram have special 2.The rated power of all resistance is 1/6W unless otherwise noted.

  • Page 23: Exploded View

    EXPLODED VIEW Model No: 14TDS3Ve Version 1.0...