There are LCD displays advertised for various models so it could be that it has gone faulty, but equally so a poor connection, so it may need checking out to confirm.
I had a Doblo doing that but strangely it seemed to be related with opening the drivers door, I didn't proceed with it and have since sold the vehicle. I understand it involves removing the speedo unit to dismantle it and there are instructions online to assist.
Others on Forum may be more familiar with the process, also of testing to confirm.