I had exactly the same issue with my "broken" bought Aura HD (still has USB issues unfortunately). I didn't break anything when opening up the device so after hours of trying to get touch working I put the unit aside thinking I had ruined it.
The next day I picked it back up again and took a look at the IR masking tape, took it off and everything worked. I've put the tape outside of the IR light guides and now the touch functionality is working again.
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