Below is a link to a service manual for this unit.
https://drive.google.com/drive/folde...kozZ1AzbDFtZ1E
It is "Electric Slide-In Range JES..."
First I would unplug the unit and then the panel/keyboard from the control board.
Clean the connector and then re-connect it and give it a try.
I am not sure what type of connector it is.
I think it is just a ribbon cable qwith the copper trails exposed.
These can be cleaned with a pencil eraser. Do not use a pen eraser as they are to course.
If it has a connector on it then use electronics connector cleaner and a tooth brush. Just be sure that all the solvent has evaporated off before re-connevting.
If the above does nothing then you could check your panel with a meter,
The cable outputs are in the manual.