Hello I have a Maytag refrigerator the control panel stop working and I can't get into my freezer unless I defrost it what should I do?

Why have you concluded that the control board is not working. Most of the time when it will not defrost it is a burned out defrost heater which is at the bottom of the freezer coils, but defrost it first. Manuals: https://dl.dropboxusercontent.com/u/...rigerators.zip
https://dl.dropboxusercontent.com/u/...e%20Manual.pdf
https://dl.dropboxusercontent.com/u/...20Handbook.pdf