Here is the tech sheet
http://www.servicematters.com/d...0Sheet%20-%208537797.pdf

Have you checked that the unit is getting power?
In the past I have had units that were there is power to the connection box but had problems with wirenuts so the unit was not receiving power.

Would be a good idea to do a live check
You should have 120 volts from P7 to P2-6 on the control board
And P7 to P8 when the door switch is closed.

It is a good idea to put a towel over the spray arm or tub opening just in case the unit start up while doing this.

If OK then the usual way to troubleshoot is to check the keypad with a meter see the tech sheet.
If OK then replace the control board.

Still a bit of a crap shoot but your odds are better.

You may want to try the following, since the unit seems totally dead this is a long shot.
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.