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Author Topic: Accidentally reversed battery polarity on Tx  (Read 811 times)

johndora

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Accidentally reversed battery polarity on Tx
« on: June 14, 2024, 06:33:32 pm »

..and there was that awful smell.


It's an old 40MHz unit and I wonder if the damage is repairable. When trued on, the Rx just makes the servos chatter, randomly.


What would have burned out?


Is it repairable?


Thanks!
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MikeMcP

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Re: Accidentally reversed battery polarity on Tx
« Reply #1 on: June 14, 2024, 06:51:45 pm »

once the magic smoke gets out, it's incredibly difficult to get it back in again
RIP
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HMS Invisible

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Re: Accidentally reversed battery polarity on Tx
« Reply #2 on: June 14, 2024, 08:00:42 pm »

..and there was that awful smell.


It's an old 40MHz unit and I wonder if the damage is repairable. When trued on, the Rx just makes the servos chatter, randomly.


What would have burned out?


Is it repairable?


Thanks!
Have a look inside and take a photo of where it smells. It is most likely to be a toasted regulator that doesn't have reverse protection.
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< All manner of contact methods over to the left.

johndora

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Re: Accidentally reversed battery polarity on Tx
« Reply #3 on: June 15, 2024, 08:18:41 am »

Thanks, will do.

[/size]It's recently been given to me and when I took it apart three of six screws were missing. Maybe the problem was there before and someone tried. I've a pal who's a wizard with electronic repairs who will look at it for me.[size=78%]
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Fastelectrics

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Re: Accidentally reversed battery polarity on Tx
« Reply #4 on: June 30, 2024, 12:16:18 pm »

Most would have a reverse polarity protection diode to prevent this from happening. It may be something simple if you can locate the burnt out component(s).
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