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Old 04-27-2013, 02:56 PM   #1
tominboise OP
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Joined: Jun 2007
Location: Boise, ID
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Electrical question - brownout damages battery tenders

I had a bad day last weekend and ended up with the 220 service line from the pole to my house grounding on a deck cover and burning through the ground and most of the way through one power feed. I believe that this resulted in a "brown out" in my house, which now has resulted in the failure of three of my battery tender jr transformers. (Also the kid Wii transformer, but I haven't looked there yet.)

I would like to open them up and see if I can repair them, rather than replacing them. Is there any obvious place to start looking inside, or should I chuck them and end it right now.
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Old 04-27-2013, 07:41 PM   #2
Beezer
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doesn't hurt them any more to look. what they usually do these days though is they scratch off the numbers on the micro chips so you can't tell what they were... might be something simple though.... if it's a transformer that should be pretty easy to figure out. Mauser Electrics is a good source



edit.....


http://www.mouser.com/Power/Transfor...ers/_/N-8u9n5/

Beezer screwed with this post 04-27-2013 at 08:02 PM
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Old 04-27-2013, 07:59 PM   #3
Merlinzen
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I would say it depends on how experienced/confident you are messing around with electronics. [btw I'm a qualified tech]

There's two main types of power supply:
"passive" [with a power transformer and series regulator]
"active" [with a switch mode regulator]
The passive or older ones are much easier to fix, especially if you have a working unit to compare to, or if you have service info or circuit diagram etc.
The switch mode supplies are much more cantankerous, and can be a PIA even if you have the info and test gear etc.



If it's a passive supply, start by disconnecting the secondary of the transformer and run some basic tests - look for shorts or open circuit windings etc - and then go from there.
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Old 04-28-2013, 02:25 PM   #4
gsweave
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Add em to your insurance claim.

consider adding a surge protector to your main line.



http://learningcenter.statefarm.com/...-power-surges/
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Old 04-29-2013, 06:06 PM   #5
ttpete
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At just over $20 apiece, it's probably not worthwhile to try to repair them.
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