[arm-allstar] Raspberry Pi3 Failure

[David McGough]

Does anything on the board feel hot after just it leaving powered up for a 
while??

I've never popped an RPi3, but I did pop a BBB board. The GPIO and other
interface pins on the expansion bus are very easy to damage.  What's worse
is that a brief "oops" --like maybe a static discharge, being too near a
transmitter RF field or a momentary overvoltage-- can leave these boards
in a "walking wounded" state, where the SoC will eventually fail.

This is one reason why we've stayed away from using the expansion bus for 
radio interfacing.

....At least the RPi3 boards are low cost.

73, David KB4FXC




On Fri, 12 Jan 2018, "Chris Souleles via arm-allstar" wrote:

> Left board powered off over night just to make sure and I removed the SD card and disconnected the USB before making measurements.  The output of the 5 V and 1.8 V regulators are fine, it is just the 3.3 V that is bad.  It failed after the node had been turned on for several hours and when it failed the node wasn't connected to any other node.    I will chalk it up to random failure and put a new board in.  Thanks,  Chris - W6CS

      From: Doug Crompton via arm-allstar <arm-allstar at hamvoip.org>
 To: ARM Allstar <arm-allstar at hamvoip.org> 
Cc: Doug Crompton <wa3dsp at gmail.com>
 Sent: Friday, January 12, 2018 2:02 PM
 Subject: Re: [arm-allstar] Raspberry Pi3 Failure
   
Chris,

 Pi board failures are very rare. The only time I have seen a failure was
when someone put 12V into it. I would say your failure is random because no
SW, SD card, or FOB could cause the problem. The USB has a 500ma limit per
port and a fuse that resets. Did you try leaving it turned off for a hour
or so and then restart? Fortunately it is not a big loss. If you weren't
messing with the IO bits, had a static discharge to the board or voltage
spikes from the power supply I doubt there is anything you did to cause it.
You might want to not use the power supply you were using with this board
on a new one.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Fri, Jan 12, 2018 at 4:17 PM, "Chris Souleles via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Excuse if this is a duplicate message.  I don't know if the first one went
> through.
>
> I have a RPi3 in a node that stopped working.  With testing I determined
> that the RPi 3.3 V is bad, it is only 1.25 V at test point 8.  The 5 V is
> ok and the 1.8 V is ok.  I tested this with nothing connected and the SD
> card removed.  This board is only a few months old.  Has anyone experienced
> a failure on the 3.3 V and have any idea what could have caused it?
> In this node I am using the DMK URi and a FT-7900 radio.
> Can something in the USB interface have caused this?  Can a corrupted SW
> in the SD card could have caused this?  I have ordered a new board but
> would like to try and understand why it failed before I install a new board
> and potentially fry it since I don't know why this one failed.  It could be
> just a random failure?????
> Thanks,  Chris - W6CS - 73
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