I can no longer get channel 8 on my tv. It's a

Impossible to answer without 'Make and Model', but we can guess.

Scan for what? Scan for new channels?

How to Scan (or Rescan) For Channels on Your TV

How-To Geek https://www.howtogeek.com > how-to-scan-or-rescan-...
Jun 19, 2019 - Find and select the "Channel Scan" option in your TV's menu. This option is sometimes labeled "Rescan," "Tune," or "Auto-tune."

Is the TV set to air or cable? It has to be set to air/antenna and a channel search has to be done first before a picture will show.

Hi check to make sure the antenna is connected correctly. try tunning the channels manually and if they come up you can save them one at a time. Also try moving the antenna to a different location. make sure the TV is set to scan on the same input that you are connecting the antenna. If all that fails ou might have a defective tuner board.

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Ur tv,u are using and getting a over the AIR free broadcating tv channels signal wright?Ur antenna are using,have problems might not work anymore in ur area.Tries manual channels scanning ur tv should get it back or buy a better antenna deign like a Digital antenna design for a hook it up for a better signal prob and longer signal ranges tries scanning for Free over the AIR channels again should solved this problems.

Do you have the antenna aimed correctly and the correct antenna for the distance between your location and the stations? Check antennaweb.org and tvfool.com for the directions to the stations you should be able to receive. Antennaweb assumes an external antenna and is very conservative in the station list. TVfool gives the stations you should get with various different types of antennas. Tall trees and buildings will block signal strength so consider the environment around you.

With digital signals, if you do not have enough signal strength for a given tuner, the channel will not come in. An amplifier may help you get the signal, particularly if the signal is shared to several devices. Failure of an amplifier or lightning surge protection can stop the signal from reaching the TV. A surge through the antenna can damage the tuner.

A damaged cable can also be a source of a problem. Check the outside portion of the wire as well as the interior wires. Replace any that have damaged insulation or ends.

For this TV, if you have done a channel scan with the TV set to the Input TV/DTV, and the Signal Source set to Antenna. Turn the antenna and then set the Additional Scan to On. (Menu > TV > Channels > Additional Scan.) Then do another channel scan.

If you need a copy of the manual, see: http://www.vizio.com/m220va.html#support .

1. Cable company sending something through the line. Also th insigna has a different tuner. Also can the insignia find the digital channels using an antenna?

Please try Auto Programming the TV.

Please refer to the page number 37 in the manual to get information about Auto Programming the TV.

Select the Auto Program option under the ANALOG SETUP SETTINGS in the Menu of the TV to Auto Program the TV which should resolve the issue.