Display says please run auto channel scan

If when You scan, and you don't get at least one channel, it will keep showing You this message! look at screen it will show new channels! if no new channels check to make sure your coax is hooked up good, also make sure you are using right setting if outside antenna, select antenna, if cable select cable for your source!

Make, model, and year please.

Where is your antenna hooked up? Thru a cable box? Direct to tv? Completely describe setup, maybe post photos

Sounds like main system control memory IC to your TV is faulty. It can be located at the main board itself. Contact any service technician to replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window, and press enter to get all related posts. It will make surf easy.

try going to settings ,menu then hit present or auto scan

Refer its user manual for details.
Electro help

Check and replace its main system control memory IC. It is faulty. It does not hold the data. Gopakumar Gopalan Google

for some reason it is not seeing you cable signal. you will need to make sure you have it set up for cable and not air. check your input options, like tv/av/hdmi/ ect hope this helps

you need to select cable from off your remote and run the auto scan.even if it says you does not need to run auto scan still run the auto scan.good luck.