I am assuming you are using an antenna the antenna is going to the unit and from the unit to the antenna IN on the TV?you are carrying out a sweep search the unit is indicating it is searching completing the task and reporting nothing found is that correct please?
I am also assuming you are sure the antenna is good?
Have you tried using another output of the DVD?like composite red\white\yellow so you will need three phono leads and this should marry upto the TV , so its antenna into the DVD player composite out of 3 leads to the TV, the tuner in the TV itself may not accomodate the player so this method will bypass that, let me know
You then pick out the input using the input or source button on the TV remote
How is this working out please?