Hi.
The TV is probably set on the analog tuner that is supposed to receive the on-the-air channels.You get no channels because there is no antenna, as you use cable TV from Brighthouse.
You will need to use the remote to tune back the TV on the cable receiver.
The easiest way to do so is turning foo and disconnecting TV and receiver box from power.
Connect back both.
With devices off check the cable box wire to the TV.
Turn on the receiver box first (ensure it is on).
Turn on your TV.
The TV should tune automatically on the cable.
If the TV does not tune, then you will need to browse for a source.
First ensure that the cable is well connected to the cable box, and that the box is on.
Use the source button to browse the inputs.
Source is button nr 8 on picture below:
Here also a copy of the manual:
LT32HVE_M Manual (MK0-UM00091G000)Regards.
Ginko.