If it is simply one segment of one digit then more than likely the bearings may be getting worn out.
Replacement is very simple.
Below is a diagram of a segment exploded out to show proper assembly. Don't try to clean with any solvents or cleaners as it may cause buildup that will prevent proper function. Back to Top Nonfunctional digits Try swapping the digit to another position on the circuit board, which is accessible by following the digit removal procedure below. Behind this digit is the circuit board for this particular line of scoreboard. The circuit board will look similar to one of these two boards, depending on the model of scoreboard you have.