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In the remote, select the input as antenna. It might be now lying as some other input. Normally the TV itself searches for channels. If it is not, go to menu in the remote control, select install-auto and press ok.
It is always possible the antenna is the issue but I have a suggestion to at least try.
With the remote direct enter a known channel like 08 enter and see if it goes there. If it does not either the signal or the TV tuner may be the issue---if it does go there you can go into TV menu and should find a add a channel feature--add the ones you want/need manually.
BEVERLYQC:: How do you " accidently erased all my chanels " from a tv??
Was the TV connected to a 'cable box' ?
Was the TV conected to 'air waves' or antena input.?
If the TV is attacned to a cable box, temperly remove the cable box INPUT wire, attache an antenna to the IMPUT AND AUTOSCAN WITH THE REMOTE CONTROL
If the TV cannot 'autoscan' in 'air wave' reception...goto menu and set input channel to ch.3 or see if there is a switch in the back that can change to ch.3 or ch.4
You should get all the 'air wave' chanels which will include ch.3 & ch.4