Why would an ATV12 not power up and have a blank display?

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Issue:
ATV12 drive has a blank display.

Product Line:
ATV12

Environment:
All

Cause:
Main control board or power board is not working.

Resolution:
Troubleshooting
Check the Mains voltage on L1, L2 and L3
Measure the DC bus
Check your DC supplies on the control terminals.
Check to see if anything is wired to the +24vdc supply of so remove it and see if its pulling down the supply.
There are no replacement parts for this drive, so you will have to replace it, if the drive is inoperative.