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Burnouts Arbitrary?

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longg(at)pjm.com
Guest

Posted: Sat Mar 03, 2012 7:38 am Post subject: Burnouts Arbitrary?

I have a Garmin 340 which burned up a main board a few weeks ago. Garmin gave no particular excuse for the failure, so I thought I’d throw out the question. 

  

<![if !supportLists]>-          <![endif]>Is it common for Audio Panels to self destruct? Mine is about 8 years old and worked normally up to the minute it failed. 

<![if !supportLists]>-          <![endif]>The repair was flat rate at $600.00 so I don’t want to throw it back in and have it go up in smoke again. 

<![if !supportLists]>-          <![endif]>Any tests I can perform? I am using 5 amp ATC fuse(s) for power. I believe that is the recommended size. 

<![if !supportLists]>-          <![endif]>The audio cables are custom built from Approach Fast Stack and have not been altered since new. 

  

  

Thanks for the ideas. 

  

Glenn 

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

0 

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    [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Sat Mar 03, 2012 8:11 am Post subject: Burnouts Arbitrary?

At 09:36 AM 3/3/2012, you wrote:

 	  Quote: 	
		  I have a Garmin 340 which burned up a main board a few weeks ago. 

Garmin gave no particular excuse for the failure, so I thought I'd 

throw out the question.



-          Is it common for Audio Panels to self destruct? Mine is 

about 8 years old and worked normally up to the minute it failed.


	


    No



 	  Quote: 	
		  -          The repair was flat rate at $600.00 so I don't want to 

throw it back in and have it go up in smoke again.


	


   Did it actually 'smoke' . . . or at least smell bad?



 	  Quote: 	
		  -          Any tests I can perform? I am using 5 amp ATC fuse(s) for 

power. I believe that is the recommended size.


	


    Sure, testing with a small fuse is one useful technique. I

    use a current limited power supply for similar explorations.

    You can set the short circuit current to any level from a

    few milliamps up to full output from the supply. Let's you

    explore a circuit's power management condition with little

    risk of subjecting it to further damage.



    Have you had it open? Can you see any char or signs of

    overheating? A experienced bench technician can do the

    sniff test and tell whether it's a component or burned

    trace .. .  but if it's a burned trace . . . it will be

    obvious. Smoked integrated circuits can be hard to spot

    sometimes.

   Bob . . .

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egilroy(at)gmail.com
Guest

Posted: Sat Mar 03, 2012 1:16 pm Post subject: Burnouts Arbitrary?

Is your avionics fan working? Lost a Garmin GPS to that a few years back.





Sent from my iPhone



On Mar 3, 2012, at 10:36 AM, <longg(at)pjm.com (longg(at)pjm.com)> wrote:



[quote]      <![endif]-->   <![endif]-->    

I have a Garmin 340 which burned up a main board a few weeks ago. Garmin gave no particular excuse for the failure, so I thought I’d throw out the question. 

  

-          Is it common for Audio Panels to self destruct? Mine is about 8 years old and worked normally up to the minute it failed. 

-          The repair was flat rate at $600.00 so I don’t want to throw it back in and have it go up in smoke again. 

-          Any tests I can perform? I am using 5 amp ATC fuse(s) for power. I believe that is the recommended size. 

-          The audio cables are custom built from Approach Fast Stack and have not been altered since new. 

  

  

Thanks for the ideas. 

  

Glenn 

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

0 

t 

     	  Quote: 	
		  



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st">http://www.matronics.com/Navigator?AeroElectric-List

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cs.com

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matronics.com/contribution

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[b]

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longg(at)pjm.com
Guest

Posted: Sun Mar 04, 2012 7:18 pm Post subject: Burnouts Arbitrary?

Good point. Yes, but it is not connected to the GMA 340. It was about 30 F outside when this happened with plenty of cool air coming in. I do not have a cabin heater.



Thanks,



Glenn



--

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longg(at)pjm.com
Guest

Posted: Sun Mar 04, 2012 7:24 pm Post subject: Burnouts Arbitrary?

Thanks Bob,



I did not open it up before it went to the shop. Garmin indicated they replaced the main board in the process. They provided no explanation. I re-installed today and grounded the case to the grounding forest. I will try a lower fuse size to see if that creates activity. I never smelled or saw smoke of any sort. 



Glenn



--

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