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Sanyo DS25380 Vertical Problem

Discussion in 'Electronic Repair' started by Rob, May 3, 2006.

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  1. Rob

    Rob Guest

    I have replaced the LA7841 vertical output ic and got the unit back up
    and going again, but the ic is getting too hot and vertical linearity is
    not good. The top part of the picture is fine, but the very bottom is a
    little compressed. Possibly yoke short? I did find some bad caps in
    vertical section and it did correct some of the problems. Just wondering
    if anyone has run into this before on this series of set?
  2. Guest

    You probably missed a cap or two.... re-check your work. If you
    suspect the yoke you should ring-test it.
  3. How do you ring test a vertical yoke? Every one that I have ever tested has
    no more than 4 rings with either of 3 Sencore units that I have. I have
    never found this to be an effective way of evaluating vertical yokes. How
    do you do it?

    If a yoke is working and the problem is linearity, the problem is almost
    always going to be a bad cap.

  4. Guest

    If you ring-test a yoke with a shorted turn and compare the results
    with a good yoke you can see the difference immediately...... a yoke
    with a shorted turn will have lower amplitude rings and be quite
    obvious when compared to a good yoke. I always keep a good yoke handy
    in my junk box for this reason.
  5. I think it's the vertical yoke that has a parallel resistor that has
    to be taken out-of-circuit before an accurate ring test is possible.

  6. Rob

    Rob Guest

    Thanks for all the help on the vertical problem, I seem to be finding a
    lot of dried up caps. I think where unit was located, it didn`t have
    much ventilation and it had alot of dust. Rob
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