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bad caps in radio

Discussion in 'Troubleshooting and Repair' started by ynk1121, Oct 17, 2012.

  1. ynk1121

    ynk1121

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    Oct 17, 2012
    The factory radio in my car quit working (1990 Camaro). One of the channels would play for a few seconds then go to static. I bought another identical used radio on ebay and that one plays but has very low volume on one channel. I took apart the first radio and it's obvious some of the capacitors are shot. I have a feeling I'll find the same on the second radio.

    My questions: Is it worth trying to fix? Is there a chance it took out one of the amp ICs? How do I go about picking capacitors? I went on mouser.com and I'm a little overwhelmed with all the choices. Should I just replace what is visibly bad, or go all out and replace them all?
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Blown electrolytic capacitors are very worth fixing if
    1) you can still read the label and find a suitable replacement
    2) the electrolytic fluid hasn't damaged other parts.

    I'd give it a try. The capacitors shouldn't be too expensive and if an IC has blown, you can still get a new radio.
     
  3. ynk1121

    ynk1121

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    Oct 17, 2012
    Is there anything I need to match besides the capacitance, voltage, and physical size??
     

    Attached Files:

  4. davenn

    davenn Moderator

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    Sep 5, 2009
    no thats about it, if the radio in that section gets quite warm... thats possible with the amplifier chips there you could go for 105 degC instead of the usual 85degC temperature rating

    note the lead style of the caps in your pic ... some are vertical mount with both leads out one end, others are a lead out each end.
    You may find the physical size is a little smaller on newer caps, this is not a problem, cap manufacturing has advanced in the last 20 years


    cheers
    Dave
     
  5. ynk1121

    ynk1121

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    Oct 17, 2012
    Yes, all of that gets covered under a big heatsink so I'll try to get high temp ones. What surprises me the most is how poorly it was thought out in terms of serviceability. All the boards are soldered together by wires. There are no connectors to disconnect to separate the boards.

    Thanks to the both of you. Going to order them and I'll post back how it goes.
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Unfortunately today you're not supposed to repair things but to buy a replacement.
     
  7. KJ6EAD

    KJ6EAD

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    Aug 13, 2011
    Soldered connections are more reliable given the vibration and temperature variations in a car.
     
  8. ynk1121

    ynk1121

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    Oct 17, 2012
    Thanks everyone! I was successful!
     

    Attached Files:

  9. davenn

    davenn Moderator

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    Sep 5, 2009
    awesome to hear :)

    thanks for reporting back

    Dave
     
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