How do I exit out of "run Chanel auto scan" on 27" haire tv

use the remote to get the onscreen menu up
move around till you get auto tune then press ok and let it run

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

If you are receiving a "No Signal" error message, verify that:

1. All of the cables physically connected to the TV and the input device are secure.
2. The input device is turned on.

Your TV needs to scan for channels before it can show programming from an antenna, from cable TV when the cable comes directly from the wall (no cable box), or from a cable or satellite box connected to the TV with a coaxial (RF) cable. Do not scan for channels if you have a cable or satellite box connected using AV (Composite), Component, or HDMI cables. The box selects the channel, not the tuner inside your television. If you are not using the "TV" input, press the INPUT button on your remote until the correct input mode is selected.
To perform a channel scan using the coaxial input:

1. Press the INPUT button on your remote to view your current input source. The TV (coaxial cable) input must be selected. This may appear as "TV," "ANT," or the channel and call letters of a station.
2. If the TV input is not selected, press INPUT until the TV input mode is selected.
3. Open the on-screen menu and select TV or Tuner option. (This varies by model.)
4. Highlight Tuner Mode and select the correct option:
   • Antenna-over-the air signals from an antenna
   • Cable-direct from the wall cable TV, or a cable or satellite box connected to the TV with coaxial cable
5. Select Auto Search or Auto Channel Scan. (This varies by model.)
6. When the search reaches 100% complete, exit to the menu.
7. Check the available channels:
   • Antenna or direct-from-wall cable-Press the Channel Up and Channel Down buttons on your VIZIO TV remote to view the available channels.
   • Cable or satellite box- Will return only one channel. Use the cable or satellite remote's Channel Up and Channel Down buttons.

If this does not resolve the issue, power cycle the TV and then re-run the channel scan:

1. Turn off the TV.
2. Unplug the TV from the electrical outlet.
3. While the TV is unplugged from the wall, press and hold the Power button on the TV for 30 seconds.
4. Release the power button.
5. Plug the TV back into the electrical outlet.
6. Turn on the TV.

Note: There is also an option to reset the TV to the factory default settings. This option is in either the SETUP or SYSTEM section of the on-screen menu. The option may be "Reset all settings", "System Reset," or "Reset & Admin." Consult your TV's user manual for the location and steps for resetting your model.

1. Remove the coaxial cable from the DTV/TV connector on the back of your television and perform a channel scan to clear the existing channels. See the procedure above. This should not find any channels.
2. Re-attach the coaxial cable to the DTV/TV connector and perform a new channel scan.

This video shows troubleshooting steps to use when a "No signal" message appears.

Recheck all connections and try to get the TV on channel 3 or 4 especially if you have a cable or satellite box.

on all tvs there is a menu pannel find the menu button on the remote or tv could also be called setup button look for channel option or antena cable option (no on most of the new tvs it is an auto scan) and select that option it will scan throught the channels and auto add the ones that get reception say if ur using an antena

if u are trying to hook up a cable box or sat box through the antena coail wire at the same time u can not have them on so to scan for antena channels turn off the sat recver and cable box scan for channels because the sat box and cable box destors the singnal when on the same time with the antena u will proble have to go back into the main menu where yu selected the channels and manualy add channel 3 or 4 which is what runs the sat/cable box if ur using the antena hookup on the tv

if u are hooking the sat/cable box or dvd player to red gren blue or yellow white red hook up's they will be under a diffrent source chanel which u can usaly get to by hitting the input or source button on the remote

Your TV probably does not have a digital tuner connected to the DTV/ANT input. Mine didn't. I had to connect the digital antenna to a digital converter box THEN go to the DTV/ANT input. Only then would it activate the DTV menu and allow me to scan for channels. If your TV worked fine with Cable TV connected to the input, it was because your signal was coming from the digital tuner in your DVR, or your cable provider was sending you an unscrambled digital signal (not likely).
I used a digital converter box I had purchased with the government $40 coupon back in 2009 but the resolution is only 480 and looks like a Monet or Renoir. Now I am shopping for a high quality tuner.

set box and tv both to chanel 3 reboot box by unplugging plug back in then do channel scan for digital channels see if that helps

The text mode has been activated either thru your cable/satelite box or your tv's. It is activated because the closed caption portion. If you think its because of your channel providers call them for the process to deactivate it . If it's your tvs check your menu's to make sure the closed caption portions are turned off. Good luck