It is common for the Digital Clusters to break and stop working.
Easiest thing to do is get another one. JDM ones will work just fine by plugging them into existing Cluster's location, provided that the JDM one works.
Some people on FA have found success in taking a bottle of electronics cleaner to the circuit boards in the cluster. You can also try looking on the boards for fried capacitors, etc and try to fix them if you're competent at soldering.
Good luck