<![CDATA[Arduino Dock fried. Is it possible to repair?]]>I managed to fry my Arduino dock using a 12V supply even if I had read before that it just takes 5V.

My Onion2+ and the OLED expansion is not broken.

However. Which component get damaged. Any suggestions?
The level-shifter, the regulator or what else?

I would like to repair the unit if possible.

Regards Lars

]]>http://community.onion.io/topic/2187/arduino-dock-fried-is-it-possible-to-repairRSS for NodeMon, 16 Mar 2026 21:00:18 GMTWed, 05 Jul 2017 12:14:13 GMT60<![CDATA[Reply to Arduino Dock fried. Is it possible to repair? on Wed, 05 Jul 2017 12:14:13 GMT]]>I managed to fry my Arduino dock using a 12V supply even if I had read before that it just takes 5V.

My Onion2+ and the OLED expansion is not broken.

However. Which component get damaged. Any suggestions?
The level-shifter, the regulator or what else?

I would like to repair the unit if possible.

Regards Lars

]]>http://community.onion.io/post/13659http://community.onion.io/post/13659Wed, 05 Jul 2017 12:14:13 GMT<![CDATA[Reply to Arduino Dock fried. Is it possible to repair? on Wed, 05 Jul 2017 14:58:20 GMT]]>@Lars-Flikkeid
Unofficial 'Omega Arduino Dock 2' schematic diagram

Absolute maximum ratings:
Atmega328P-AU maximum operating voltage 6.0V
TXS0108E VCCB max supply voltage 5.5V
I don't know the exact type of the synchronous step-down regulator IC. I suppose it is an AX3503 with max Vin +7V.
A similar synchronous buck regulator IC TD6817 (or TD6811) has max Vin 6V.
Unfortunately I don't know what is the protector IC at the USB host port.

Do you have a "short circuit" at Vin now?
If you are a lucky man maybe only one of them went wrong and it protected the others.

Good luck!

]]>http://community.onion.io/post/13661http://community.onion.io/post/13661Wed, 05 Jul 2017 14:58:20 GMT<![CDATA[Reply to Arduino Dock fried. Is it possible to repair? on Wed, 05 Jul 2017 17:42:58 GMT]]>Thank you for your helpful answer, I will check for short circuit.
Do you have a suggestion for any other
protector IC at the USB host port. It is impossible to see its typing.
/ Lars

]]>http://community.onion.io/post/13662http://community.onion.io/post/13662Wed, 05 Jul 2017 17:42:58 GMT<![CDATA[Reply to Arduino Dock fried. Is it possible to repair? on Wed, 05 Jul 2017 17:45:50 GMT]]>@György-Farkas Also it seems that the atmega is just connected to the 3,3V and not the 5V, and maybe it therefore was protected since it never was in direct contact with 12V.
I hope at least 🙂

]]>http://community.onion.io/post/13663http://community.onion.io/post/13663Wed, 05 Jul 2017 17:45:50 GMT<![CDATA[Reply to Arduino Dock fried. Is it possible to repair? on Sat, 15 Jul 2017 04:23:43 GMT]]>@Lars-Flikkeid said in Arduino Dock fried. Is it possible to repair?:

@György-Farkas Also it seems that the atmega is just connected to the 3,3V and not the 5V, and maybe it therefore was protected since it never was in direct contact with 12V.

All power pins of the ATmege328P-AU (VCC pin 4, pin 6 and AVCC pin18 of the 32-pin TQFP package) are connected to +5V (ie VIN, USB VBUS) on Arduino Dock 2.

]]>http://community.onion.io/post/13751http://community.onion.io/post/13751Sat, 15 Jul 2017 04:23:43 GMT