[arm-allstar] Raspberry Pi3 Failure

[Chris Souleles]

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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