Any help would be greatly appreciated
Is the TV still warranty? If there is warranty then avail it first so that no risk at your side.
If ever there is no warranty at all then you can open your TV back and verify the loss connection connecting your cable. This symptom also cause by TV tuner error and need to be checked personally by a qualified electronic technician.
ps, please do not rate me if the solution won't resolve, however; it is invaluable solution rate me acceptable.