On page 41 of your TV manual it says,
Partial Channel Search
If you believe channels are missed from the auto search, you can do a partial
channel search to look for channel in a certain channel range again. Press the
down button to highlight the Partial Channel Search selection.
Press the right button to enter the submenu.
Press the right button to select scan mode to look for Analog, Digital, or both
Press the down button to highlight the...