Cat 320 B Excavator electronic display screen problem.

The Light inside the electronic monitor is faulty on my 1997 320 B Cat excavator. Some times it works on start up then goes out , otherwise it never comes on and you can only see any indicators in very good outside light.
All functions appear to otherwise work.
I am wondering if this is a common problem for this machine and if so is it repairable or should I replace the camplete screen with a new one.

Cat 320 B Excavator electronic display screen problem.