[tugzz]

Hi
I have a Maytag 300 dishwasher that is stuck in "lock" mode. I Uunhooked the ribbon connector and cleaned it and reconnected. I then tried to enter "Field test mode" and the lock light blinks a few times and then stays on. Still won't start. Could it be a bad touch panel or board?
Thanks

Model MDBTT60AWW
Serial 32582864

[denman]

Could be either the control board or the keypad.

A model number may help others help you.

[tugzz]

Thanks Denman

I updated the post to include them.

[denman]

Here are your parts
Wiring information replacement parts for MAYTAG MDBTT60AWW Frigidaire/refrigerator | AppliancePartsPros.com

I currently cannot find a tech sheet for your unit so cannot provide a method for checking the keypad.
Check behind the kick plate to see if the tech sheet is there. It should have the pinouts for the keypad. You then can check them with a meter and if they check out OK then the likely culprit is the control board.
Still a bit of a crap shoot but your odds are better.

If it is not there from the sounds of your symptoms the control board would be my first choice.

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.