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Whether you have a remote or not, you'll need to access a menu screen and figure out how to use the volume buttons or channel buttons to highlight the scan for channels section and allow the TV to scan to pickup or drop channels.
It's usually somewhat self-explanatory once you've accessed the menu.
Typically you can access the menu, select "tuner" or something similar, make sure you're selected either on CATV or ANT (or similar), then do a channel scan. Should be pretty straightforward. Oh, and make sure you actually HAVE cable. If it's digital cable, you may need an external converter box for it to work.
if your tv doesnt have a digital tuner, you cant, unless you have a digital to analog tuner converter (can be purchased in walmart, or other stores that carry tv s, electronics) you tune your tv to 3 or 4, use the converter box to scan for channels, and for changing channels instead of your tv tuner
Do a channel scan before you call provider and ask them to change it to a channel number that is not being occupied. Ask you provider to change your channel number on your router? You and your neighbor is sharing the same channel number. One is over powering the other.
Do you have the tuner locked out for use of HDMI input only?
Most of the time when a selection is not able to be hi-lited it is
because a feature that is activated locks out other selections.
Hope this helps,