Error 12c write failed Errno 5 input error

Onefinity support is active on the forums but in your case I’d contact them directly if you need any hardware replaced…

Looking at the output you’ve posted it seems there might be an issue with the power supply (there is no status for voltage in or out), you might want to also verify it is set to the correct voltage as shown on this link:

Also I would suggest you disconnect everything from the controller except the display - if you have a dead short somewhere it may cause the power supply to disable that voltage rail.

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