Question about Cobra 29 LTD CB Radio

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Diode or not

I was hooking up my PA to my LTD 29 with speaker wire to test it and want to go move them and heard a pop and it shut off and wont come back on

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The first thing to check is the inline fuse. If it is blown and a new one does the same, you may have a shorted reverse polarity diode across the power input. If you need further information on how to check and replace it let me know.

Posted on Oct 21, 2008


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plug the external speaker into your PA jack and select the PA switch. If PA works then the audio chip is good. The cobra 29 must have a mic plugged in to get receive audio, You may have a broken wire at the mic connector.

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Probleme realistic 451

when you use the PA function you have to hook up another speaker so that the sound comes out when you talk

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What would cause my cb to blow fuses when u turn it on

d23 a 1n4004 diode second component from pa speaker port inside radio has failed. It is most likely that neg/pos polarity has been switched shorting this diode. It is there to protect your radio from reverse polarity as so it is names the "protection diode." 2 solutions first not recommended.

1. Cut the diode this will stop the directed grounding that is continuing to blow your fuse.
2. Go get a pack of 1n4004 and rosin core silver solder from radio shack and replace it paying attention to the direction it is installed.

just a side note the solder trace often burns in this area so a jumper wire soldered in around this bad area solder side maybe needed.

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Hi, my name is John. Either that or you have a bad capacitor in the volume. Try going with the external first. Then go from there.May be other issue...Let me know. I will post it here...hope this was helpful rating..

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Do you have any noise at all coming thur? If not do you have an external speaker try it still nothing then take your speaker plug and plug it into your pa jack key the mic do you hear anything if not its your IC chip,its bad it'll need to be replaced,if you do it could be a bad soilder on the board or a broken wire in the mic.

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Have you check your voltage regulator. 2 outer legs should read 13 volts middle 9 volt. Around and about.

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This is an easy fix if you are comfortable soldering.

You must have hooked it up backwards. Big problem when using a cigarette lighter adapter. You have to be careful, if you hook a radio up backwards you blow the polarity protection diode.

  • Go to radio shack and buy an N1004 diode.
  • Open the radio
  • Look towards the back right of the radio for a black diode D23. it will probably look burnt, but not always.
  • Use a soldering wick to remove the solder holding the diode in.
  • Remove it, and replace the diode making sure its going in the same direction as the old on. Strip on the side the triangle is pointing.
  • Solder it in.
  • Test the radio
That should do it.

Make sure you are careful to hook the radio up to power corrctly.

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This may be a dumb question, but have you tried replacing the fuse in the power wire? That fuse blowing might have been the pop you heard. It is possible that you did short something out, though I have never had that happen by messing with the wires for the PA.

If replacing the fuse does not help, and you know that there is still good power and ground coming out of the power plug, you may want to try replacing the protection diode.

That is where I would begin, the fuse, power and ground coming into the radio, and then the protection diode. If nothing helps, please let me know.

Dean Pitts
Rollin CBs

Oct 04, 2008 | Cobra 29 LTD CB Radio

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