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DAC39J82EVM: Board is not powering up

Part Number: DAC39J82EVM

We have purchased 2 numbers of DAC eval board DAC39J82EVM.

One from from TI online and other from Digikey.
We are using these boards from since 2 months for development and characterization.

Now, both these boards are not powering.

Wanted to know the precedure for repairing these boards?