I have a Toshiba purchased that I recently purchased used. It has worked fine with a cable box/firestick. Today I tried to connect to my backup rooftop antenna because the cable is out and I was given a week out repair date. The tv picked up 35 channels in the auto scan, but not one channel is viewable. I double checked all connections to the antenna and connected another tv to the antenna cable and it worked as it should. I am not sure if it is something in the settings on the Toshiba or a bad internal part. On every channel it says digital strength low and has just a scattering of language, but no picture. My other questions is if the tuner is in fact bad, would an external tuner connected to the antenna then to the tv solve the problem? Thanks for any assistance.