Blew a capacitor in my 29LX CB - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Jeep Discussions > Communications and Electronics

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-30-2012, 09:13 PM
Thread Starter
  #1
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: Sudbury, MA
Posts: 2,306
Arrow Blew a capacitor in my 29LX CB

So I was squawking away today and all the sudden POP - then a bad smell. Typical of a blown capacitor. Basically I can still hear people but my mic cannot calibrate and no one can hear me. The cap blew when I had the mic keyed.

Has this happened to anyone? Do you know what kind of cap I can replace it with? I will open it up tomorrow and see what the deal is. It is just a few months old so I can send it back to Cobra but it seems rather simple so I would rather do it myself. I have done plenty of soldering so I am comfortable with it.

__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
Grabbers on Vision Wheels
lolpetewtf is offline   Quote
Old 12-01-2012, 10:02 AM
Thread Starter
  #2
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: Sudbury, MA
Posts: 2,306
This is the one I am thinking is blown:


__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
Grabbers on Vision Wheels
lolpetewtf is offline   Quote
Old 12-01-2012, 11:18 AM   #3
Jeeper
 
sparky's Avatar
 
Join Date: Oct 2009
Location: Phila
Posts: 3,454
If a cap is blown, you'll see it. It will be torn apart and black.

Replace it with the identical component. With luck you can still read the marking on the side. If you can't read it find a schematic. The component's identifier are marked on the board.
sparky is offline   Quote
Sponsored Links
Advertisement
 
Old 12-01-2012, 11:33 AM
Thread Starter
  #4
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: Sudbury, MA
Posts: 2,306
I cannot figure out what else it could be besides a cap. This is the only strange looking one on the board. I will hear back from Cobra next week about a warranty claim.
__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
Grabbers on Vision Wheels
lolpetewtf is offline   Quote
Old 12-01-2012, 07:09 PM   #5
Jeeper
 
psouza's Avatar
 
Join Date: Dec 2011
Location: Watsonville, California
Posts: 64
The item you have pointed out is a coil form, with a ferrite core and and it is waxed over to prevent vibration from detuning it.

You are looking for an aluminum electrolytic capacitor with goo coming out the bottom. If you intend to repair it, do it fast because the electrolyte is very caustic and will damage copper and other metals.

The value you need will be clearly printed on the component. Choose a higher working voltage than is listed on the can to prevent a recurrence.

And, I'm not convinced it is only a cap that failed.


Phil
psouza is offline   Quote
Old 12-02-2012, 10:59 AM   #6
Jeeper
 
sparky's Avatar
 
Join Date: Oct 2009
Location: Phila
Posts: 3,454
I was responding to your statement, but I agree with Phil, that's a coil you are pointing to, they don't blow.

Take a real close look at the board. Start with your nose, you can smell a blown component. Then get it really well lighted and get close.
sparky is offline   Quote
Old 12-02-2012, 11:05 AM
Thread Starter
  #7
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: Sudbury, MA
Posts: 2,306
Thanks so much for the help guys. I did the nose thing, but it seems rather even throughout the unit. I will hear from Cobra this week about warranty work. I hate being without my Cuss Box! Let ya know what happens!
__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
Grabbers on Vision Wheels
lolpetewtf is offline   Quote
Old 12-11-2012, 11:35 AM   #8
Newb
 
Join Date: Dec 2012
Posts: 1
I disagree with the earlier comment that a capacitor turns black and blows literally when it blows. It might actually just give you a pop noise and just smell bad. But your image of the circuit shows that it’s a coil and not a capacitor. Also, check if it’s a polar capacitor; if it is one, it’ll have readings written on the side.
__________________
surface mount assembly
nicolas81 is offline   Quote
Old 12-11-2012, 12:17 PM
Thread Starter
  #9
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: Sudbury, MA
Posts: 2,306
Thanks Nicolas. I will use a magnifying glass later to look at it again. I had my eyes on that board for an hour but could not find anything.
__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
Grabbers on Vision Wheels
lolpetewtf is offline   Quote
Old 12-11-2012, 08:44 PM   #10
Jeeper
 
psouza's Avatar
 
Join Date: Dec 2011
Location: Watsonville, California
Posts: 64
Since you have not been able to find the faulty part by visual inspection, I suggest you inspect the various power transistors for possible shape distortion (swelling) and/or cracks on their flat surfaces. It may be that some part of the transmitter chain may have failed. This link will lead you to some diagrams that will be very close to what you have. Unfortunately transistor designations are not carried over to the silk screen so the appropriate devices will not be obvious at first

Cobra 29 LX LE 50th Anniversary CB Radio

It is a bit of a coincidence for an electrolytic to fail, in that manner, during transmit. Normally a electrolytic that fails in that way,(seal rupture), will be used as a power supply filter/bypass with nearly the full power supply current available. That would probably result in an additional resistor to over heat with discoloration of the PC board in addition to a open fuse.


Phil

psouza is offline   Quote
Reply

Tags
cobra 29lx

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off






All times are GMT -5. The time now is 09:25 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.