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The control board and touchpad are all one assembly on this model so there is no sense in trying to test which one has failed because those are the only 2 parts that can cause the issue. You can try to unplug the dishwasher or flip the circuit breaker off for 5 minutes to see if the electronics will reset, but if not then the control kit just needs to be replaced. Below is a link to the board kit you'd need to order and replace for your model to resolve the issue.
CLICK HERE for control kit
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