[arm-allstar] Raspberry Pi3 Failure
csouleles at prodigy.net
Fri Jan 12 17:30:17 EST 2018
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
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.
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
> 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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> arm-allstar at hamvoip.org
> Visit the BBB and RPi2/3 web page - http://hamvoip.org
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