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Sony KV-27HFR - Bad Tuner?

Discussion in 'Electronic Repair' started by Chris F., Jul 4, 2007.

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  1. Chris F.

    Chris F. Guest

    This may be a toughie.... the set will tune in a station but will not lock
    on, it just drifts back and forth, alternating between a picture and snow. I
    replaced all the caps in the tuner section and it made no difference. I
    can't locate a pre-scaler IC (which I've seen go bad on other sets), so I'm
    assuming it's built into the tuner itself. Am I looking at a bad tuner at
    this point? (Part# 1-463-771-11)
    I'd normally junk anything needing a tuner, but this set just has too nice
    a picture to give up on it.
    Thanks for any advice.
     
  2. AJ

    AJ Guest

    Very good probablity, have you checked all the voltages associated with the
    tuner and compared them to those listed in the service data? Easiest thing
    may be to sub the tuner and try it.
     
  3. Have you tried resoldering the bad joints in the IF block? Very common on
    these uints.

    Leonard
     
  4. Chris F.

    Chris F. Guest

    I will give that a try, thanks.

     
  5. Chris F.

    Chris F. Guest

    Yup the voltages are all good (don't have the manual but the voltages are
    marked on the board). A 5V supply was measuring 4.7 (with no measurable AC
    ripple) but I don't know if that's a problem or not....

     
  6. Andy Cuffe

    Andy Cuffe Guest

    The most common place is on the AFT coil, but check over everything
    around the IF IC.

    Andy Cuffe

     
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