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Replacing a variable capacitor

Discussion in 'Electronic Repair' started by Marco De Vitis, Jul 23, 2003.

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  1. Hi, I've got a newbie question to ask.
    In short: if I'm going to replace a small variable capacitor in a TV,
    being it "variable", I'd expect I'll have to regulate it somehow...
    won't I? And how?

    Extended version: I recently asked for help here on repairing a Sony TV
    (KV-X2531A, chassis AE-1C) which was losing color for short times; the
    thread subject was "Intermittent color/bw on Sony TV".
    A person who kindly answered by mail did the right guess: a variable
    capacitor near the subcarrier oscillator. I swapped it with the
    identical one which was under the other nearby oscillator, and the TV
    now works fine!

    Now, supposing I want to totally replace them and supposing I can find
    them in a local electronic shop, being "variable" capactors I'd expect
    some kind of regulation to be needed... but they are just small circular
    red/orange thingies with a cross screwdriver "slot" on top, and I can't
    see any values or anything on them... Will I really need to regulate
    them? How can I do it?

    Thanks a lot for any info.
     
  2. You will have to find the value of course, but they are simply adjusted by a
    non metal tool (screwdriver type tip) to suit the operation of the circuit.
     
  3. Did you try swapping it back? Maybe it was just a bad solder joint.

    Variable capacitors rarely go bad.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
  4. Sofie

    Sofie Guest

    AGREED..... almost NEVER go bad unless they have been broken by improper
    adjustment or excessive force.
    --
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    snipperoo:
     
  5. Well, go by his experience. I'm going by knowledge of how they are
    constructed. :)

    As far as replacement, if you can't get something exact, one thing to
    do might be to take both of them to a repair shop and see if they can
    either provide a replacement or measure the good one so a generic variable
    cap could be ordered.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
  6. john

    john Guest

    Very rare indeed does one go bad...
    /\ /\ /\
    /\
    Complete Rubbish.


    Kip
     
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