How about the physical size and description of the device. Seems like that might be a tuner number you gave. Or is the problem that the F connector to it has been pulled/sheared off or some units have the F-conn into a small metal box/isolation unit which then remotes thru shielded cable down to the tuner.
73's de Edd
:Looking for a ENV56D18G3 for a hitachi TV. It is the input device for the cable. Kind of new at this TV repair stuff.