Looking at my earlier post I did not include the manual so here it is
http://appliancejunk.com...ownloads;sa=view;down=69

Since the control board is getting power you should see some signs of life.

I would try the following and if that does nothing then I would replace the control board.
It is a bit of a crap shoot but it is the most likely cause.

Connector Cleaning / Checking
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.