ARTY board, external 12V power does't work

[nolaziness]

My ARTY works well when powerd by USB port(J10 connected, J13 set to USB).

But it can not power on when I plugin a 12V adaptor into J12(J10 not connect, J13 set to REF).The voltage between J13 REG pins is 0V and voltage around R245 is 12V. No chips fever.

I tested some voltages on around the IC12 with the 12V adaptor plugined in, as the following.

My ARTY  is a new one, maybe the IC12 damaged?

[Cristian.Fatu]

Hello,

 

Thank you  for the very accurate information you have provided.

According to the reference manual 

https://reference.digilentinc.com/arty:refmanual

it is important that the external power supply provides a  "center-positive" voltage. Can you please check this as well ?

 

Regards,

Cristian

[svet-am]

It is January of 2018 and I am having the EXACT SAME issue as reported here, down to all of the details.  Please see my thread here:

As a debug step I even tried providing Vcc via pin header J7 (to remove issues related to the center-positive plug) and got the same behavior.

 

[jpeyron]

Hi @svet-am,

I have sent you a PM about the next step for this issue.

thank you,

Jon