Question about Cobra 29 LTD CB Radio

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Cobra 29 ltd classic

I had this radio given to me, it does not turn on. i took my test light and check the internals of the radio and got power inside the radio. i then went on the the next step and replaced d 23 so im lost and would like some guidance. help please thank you jon

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  • magnum383 May 11, 2010

    Are you using a 12 volt test light to probe around the inside of your radio? IE the same type you would use to test your trailer wiring on?

  • Don Reiman May 11, 2010

    I could still have power in some parts of the radio if only the diode on the neg side went if he has the antenna connected and is grounded to the vehicle if he his checking this inside his vehicle.

    Is this being checked without the antenna wire connected.


  • Goober Pyle May 11, 2010

    If you have power inside then the polarity diode would be ok and not shorted. Did you check for power at the front panel power "on" switch? +12v in and +12v out when on?

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Hi there!

These repairs can be a little tricky to fix with out seeing the radio and the right equipment. Try replacing also D8 and or C123in between both diodes but first make sure on the other side of the trace side there are no burned out traces and they all look good. These traces can have a very small crack that you cant see with the naked eye so use a good magnified glass. Also is is there any lights on at all on the radio when you plug it in?? Because some times TR23 will go out and the radio wont come on but there will still be a meter light or green RX light!! Hope this helps a little let us know if you have other questions!!

Dennis

Posted on Aug 29, 2009

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Great radio when it works.
If you have your settings on CB - not PA - -be sure that your Cobra has that setting selected.
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Hi,

Appreciate the direct "Ask Me" again.

The initial posting would still hold true, best would be:
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Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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