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Need some expert help with this rca Tru flat

Discussion in 'Electronic Repair' started by [email protected], Mar 23, 2007.

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  1. Guest

    So I picked up this set from a friend who described it only as "it
    works but the colors are weird"

    I've checked the degauss circuit, any leaky caps etc etc and am coming
    up empty--anyone have any thoughts as to what this particular failure
    mode might be from? Its a 27" RCA tru flat. Of interest is that when
    its dark the color bands aren't as close or bright but when its light
    the color bands get closer together and more distinct.

    thx in advance!
  2. Meat Plow

    Meat Plow Guest

    Do the bands move?
  3. Guest

    in a fixed image the bands do not move--they do move as the picture
    brightness increases or decreases.
  4. Meat Plow

    Meat Plow Guest

    Odd, haven't seen one like this that I can recall. Hopefully someone will
    chime in with a clue as this has sparked my curiosity.

    You didn't try to manually degauss it did you?
  5. Guest

    No i tested the degaus circuit and it operated as it should. I also
    replaced the "tv on a chip" IC thinking maybe the color signals have
    been corrupted--made no difference. Trouble is I've never seen
    anything like this so not sure where to start.

    thx for looking though!
  6. Meat Plow

    Meat Plow Guest

    If the tube has been severely magnetized the degauss circuit won't help.
    Was the set dropped? Maybe something inside the tube came loose.
  7. Chuck

    Chuck Guest

    Looks like a bent shadow mask in the CRT. Set has probably been
    dropped. Chuck
  8. Andy Cuffe

    Andy Cuffe Guest

    It looks like it was dropped to me. The only other possibilities I
    can think of are the degaussing circuit, or the yoke has moved back on
    the neck.
    Andy Cuffe

  9. S

    S Guest

    So I read "bent shadow mask" as "tube is hopelessly fubared" :p --I'll
    give the yoke a tug and see if its loose at all--doesn't appear to be
    from what I recall but worth another look I guess. Thanks for the
    feedback guys!
  10. Franc Zabkar

    Franc Zabkar Guest

    Smack the face of the CRT with the palm of your hand. If the patterns
    vibrate, then I'd suspect a damaged shadow mask.

    - Franc Zabkar
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