All the other lights are working but the start/cancel button, which is unresponsive, so I can’t run the machine. Will replacing the control panel and touch pad solve the problem?
Here are your parts
Replacement parts for MAYTAG MDB5600AWW Dishwasher - Undercounter | AppliancePartsPros.com
Here is the tech sheet
http://www.servicematters.com/maytag_library/docs/16023063.pdf
And a manual
http://www.servicematters.com/maytag_library/docs/16021814.pdf
The usual way to trouble shoot this is to check the switches on the control panel (keypad) with a meter, see the tech switch. If OK then the control board is probably the problem
You may want to try the following:
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.