[arm-allstar] Raspberry Pi3 Failure

[Elliott]

We had a Pi3 fail as well. For us, the 1.8v switching regulator failed. There was actually a visible defect in the chip. These are not industrial grade computers. But good enough for $35...

de W6EL

> On Jan 12, 2018, at 4:16 PM, David McGough via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> 
> 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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