No buttons work

Help! Our touchpad has been working on and off for some months. Now it stopped working all together. Do I need to buy a new touchpad? If yes, can I install it myself? I opened the door of the dishwasher and saw the inside of the control panel but I have no idea what I am looking at. If I order a new touchpad does every thing come assembled? If it’s not the touchpad, do I try something else?