I killed my BBAI...

[Hunter Long]

So I've been using my BBAI for about 2 weeks now and today it suddenly died. I had some pins jumpered together and I had an oscilloscope probe connected to one pin. It suddenly turned off and now it won't power back on. I had a fan connected to the 5V rail at the time. Now the power light doesn't turn on, though the 5V rail is working. I also probed the board and it looks like the 1.15V rail and the 1.35V rail also still have power. But the 3.3V rail is sitting at 0V. 

As far as I know I didn't short out any pins or do anything weird to kill it. Any ideas what happened? 

Thanks!

-Hunter Long

[Gattu Savanth]

Hi hunter long,
Actually same issue has been happened to my beaglebone ai today. the beaglebone is not powering on.previously i was working with one pin and suddenly board has powered off and its not powering on what to do.does the board is damaged.please anyone help.
Thanking you
-savanth

[Jason Kridner]

Will they boot off of microSD cards? I'm wondering if there is any chance something is being done to corrupt the eMMC causing it to fail to boot and shutdown very quickly.

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[Gattu Savanth]

Hi jason sir,

No i am not booting from sd cards. I am booting from onboard memory only  and why my beagle bone ai board is not power on I am still not understanding. please what to do?

Actually it is a new board. I bought it 1 month before and I have done nothing I have used only one pin to run servo motor and the board suddenly switched off and from then onwards it is not powering on. please help me.

thanking you

-savanth

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[evilwulfie]

If you exceeded the specs on the single pin you can kill the processor
so maybe if you can explain how you connected your one pin
it may help

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[Gattu Savanth]

Hi sir, 

so basically what i have done is i am unable to access gpio and pwm pins from adafruit python library. 

so what i have done is pin multiplexing from the beaglebone ai survival manual.

after pin multiplexing i have kept my servo signal pin in the P9_14 and i have tried to run the code in c language and there was small movements in motor and suddenly the beaglebone was switched off and from then onwards the board is not powering on. 

so that means my board has been damaged due to one pin.How it can be possible.I have powered the servo from my 5v battery only i have just used P9_14 pwm pin thats it.due to this how the processsor will die.please what is the solution does repair is possible or what to do, i am really worried.the board is also quite expensive to buy again.I am very disappointed about the beaglebone ai.

Thanking you

-savanth

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[Dennis Lee Bieber]

On Sat, 9 May 2020 23:33:40 +0530, in gmane.comp.hardware.beagleboard.user
Gattu Savanth <savanthgattu123-Re5...@public.gmane.org>
wrote:

>Hi sir,
>so basically what i have done is i am unable to access gpio and pwm pins
>from adafruit python library.
>

To my knowledge, the BBAI does not permit run-time pin-muxing and
requires the pins to be configured using the u-Boot loaded device tree. The
Adafruit libraries probably assume BBB with run-time pin-muxing capability.

>so what i have done is pin multiplexing from the beaglebone ai survival
>manual.
>after pin multiplexing i have kept my servo signal pin in the P9_14 and i
>have tried to run the code in c language and there was small movements in
>motor and suddenly the beaglebone was switched off and from then onwards
>the board is not powering on.
>

Show use the code... Show us the wiring fully... Provide spec sheet for
the servo...

>*so that means my board has been damaged due to one pin*.How it can be

>possible.I have powered the servo from my 5v battery only i have just used
>P9_14 pwm pin thats it.due to this how the processsor will die.please what
>is the solution does repair is possible or what to do, i am really
>worried.the board is also quite expensive to buy again.I am very
>disappointed about the beaglebone ai.
>

I/O pins on the Beagles (all models) are limited to 3.3V (analog inputs
limit to 1.8V). If -- at any time -- your servo put 5V on the control line,
you have fried the processor. Lucky people may only fry the I/O buffer
circuit and the rest of the processor remains functional -- but a
significant 5V shorted to an I/O pin could do anything to the chip --
especially if it did not go through some sort of resistor network (5V at a
fraction of a mA might kill the pin, 5V at power-supply 1+A will kill it
all).

Granted, a decent servo shouldn't have feedback from V+ on the control
signal pin, and may even function when the power is 5V/GND with a 3.3V max
control signal (since position is by ratio of high/low, so long as the 3.3V
high is above any internal threshold
https://aishack.in/tutorials/servo-motors/ the pulse comparator should work
[Interesting... I'd been thinking the comparator may have just relied upon
integrating the PWM signal into equivalent voltage, and comparing that
voltage with the output of the potentiometer itself])
FYI, the earlier question was not "are you using an SD card to boot"
but was a request "will the card boot if you use an SD card instead of the
eMMC".


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Dennis L Bieber