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I've got a 3790 with identical symptoms [won't charge by any method, powers up with another battery]. I bought it cheap for spares mainly to get the screen. Original battery is ok and working now in another unit so i guess it's got the same problem as your 3490 Loly. I suppose the fact that they won't charge by either the powered mount or microUSB port is a sure indication of a board malfunction. But it looks like big-time micro-surgery to replace any component on those boards.
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Thread: Garmin 3490 power issue
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17th February 2014, 12:15 AM #1Garmin/GPS Systems GMod.
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17th February 2014, 08:21 PM #2Member +
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Hi
I also have a 3790 with exactly the same problems as Neil listed , battery will not charge under any condition ,although the unit works fine when plugged in ( shows as charging , but actually running on 12v power.
Interested as to how this works out for lollypop
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