Note: Do not use telco products for the NCE cab bus! This includes phone splitters and cables. Making your own cables is not recommended.
If it's a wireless cab, remove the batteries and leave them out.
Bypass your layout's cab bus wiring by plugging the cab directly into the command station using the jack labelled "cab bus". If it works normally, the issue is with your panels or panel wiring.
If the cab had been dropped or taken a static or electric shock, the display can go blank or show incorrect data.
If the track power and cab bus are bundled together right next to each other, that could be generating crosstalk and corrupt data. Move them a few inches apart.
If the cab bus has several items on it (UTP panels, throttles, AIU, etc.) or is very long, it might need supplemental power injected via the jack on the back of a UTP panel. We suggest adding additional power to the cab bus every 30 feet or every 4th device on the cab bus. Read this: Cab Bus Device Current Draw And Capacity.
Longshot: Check CV29 in all your locomotives to ensure Railcom is disabled.
https://ncedcc.zendesk.com/hc/en-us/articles/200537669-CV29-Explained
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