Reversed polarity on current sensor setup - how bad is it?

Today while hooking up my hot-off-the-presses current sensor I made a mistake: I soldered the 3-pin header into the wrong position on the IMU, and didn't catch it before I attempted to hook up the current sensor. The net result is that the + battery lead from the current sensor (3-cell lipo voltage) went right to the ground pin ont he IMU, with appropriately non-working behavour from the whole unit.

After sorting out the incorrect lead I no longer get much out of the APM/IMU - if I plug the APM/IMU into USB the blue "on" light and the Rx/Tx pair blink. Then everything shuts down, and the fuse gets painfully hot. If I separate the IMU from the APM the fuse doesn't get hot, the on light continues to blink until the IMU is unplugged from USB.

Is there a way to determine which system (IMU/APM) I fried so that I might replace the toasted board?


Thank you!

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Permalink Reply by DIY Drones Store Support on March 14, 2011 at 3:41pm
Sorry to hear what happened. The only way to test the APM would be to use an FTDI cable and see if you could upload firmware to it or not. But this also doesn't test the PPM encoder and some of the other components on the board like the multiplexer. For the Oilpan, it's hard to test without a working APM but you can see when a component is fried. The top of the component will have a deform/bump on it.
Permalink Reply by JJ Blackwood on March 14, 2011 at 4:09pm

Thank you for the reply - I'll give the FTDI a try tonight. I was a failure analysis engineer for a large part of my career and have given the part a good optical inspection however I don't see any obvious signs of released smoke. I just bit the bullet and ordered the all in one kit, if I have extra working parts then maybe I'll have to get a quad to fly them ;)

 

Thanks again!

Permalink Reply by Antonio Arns on June 6, 2012 at 4:30pm

Hi how you solve this? I`m with the same problem.

 

 

Permalink Reply by Jon von Weymarn on October 14, 2012 at 8:26am

I am also wondering if you were able to rescue your gear?

Also I am wondering which component is the fuse? Quick googeling didnt give the answer...

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