Tv wont get channel signal

If you are using an Antenna, Coaxial cable from the wall or a cable/satellite box connected to the TV with a coaxial cable, you will need to do the following steps:
1. Press the INPUT button on your VIZIO remote to view your current input source. Ensure that the TV input is the input that is selected.
2. If the TV input is not selected, press the INPUT button on the remote until the TV or DTV input option is selected.
3. Press the Menu button on your VIZIO remote and select CHANNELS.
4. Select the option that says FIND CHANNELS.
5. Once the scan is completed it will say DONE. Press the OK button on the remote once. This will go back to the channels menu and then you can press the EXIT button to leave the menu.
6. Use the VIZIO remote to change your channels

To Exit Self-check Screen

• Press and Hold Power button on the TV for 5 seconds [or] disconnect the AC cord from wall socket.

TV volume down and OK on the remote only does a basic IC self check. It do not rest the TV. It do not clear channel programmed settings, picture settings, channel labels, lock settings or password. Using this method, it shows the units' firmware version [Peaks 1.050 and GenX 1.00] and it checks the IC communications only. This is more useful to identify the firmware version, without having to decode the info in the setup menu about version/screen.

TO RESET THE UNIT

• To make a reset to TV, turn it ON while pressing the [Volume-ve] button on the main unit, and press the 'Menu' button on the remote control for more than 3 seconds. The self check menu appear on the screen. Then disconnect the AC cord from the wall outlet. [ALL PROGRAMMED PARAMETERS WILL BE ERASED]

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.

Hi carltonmarcumy name is Mike Houston of DISH Network and for the TV2 you want the Modularset to cable and channel 73, and then make sure the TV itself is set to channel73. After you have the modular set to channel 73 and the TV set to channel 73and you do not see a DISH Network picture you will then make sure theconnections from the wall to the TV are tight as well as from the receiver tothe wall. Then you will want to unplug the receiver for 10 seconds and plug itback in it will power up and acquire the signal and once you see that check TV2and you should see the same thing on the screen. I will send a link that will helpout with these steps. http://www.dishnetwork.com/SupportSection/black-blue-tv2

Go to Menu - then channel - then memory channel - let the tv reconfigure the channels. You might need to unplug tv (the light to tv might still be on - press the on button to release the juice). Then plug tv back in. I did this and it worked.

get a niversal remote and use the codes for lg not for haier,,, once its programed (turns off/on) press last/channel button that`s it

I had the same problem with my 42" vizio. Was working fine for about a year and a half, then a month after all stations went digital, I couldn't see any digital channels and it wouldn't scan for digital signals
This is a strange go around, but it worked for me. . Tried unplugging, pushing power button for two minutes... did everything the forums suggest, with no resolve. But, here's what DID work for me. Trust me, it sounds strange, but it continues to work (and, yes... it's not a permanent fix... the channels still go out once in a while, but I can always get them back now)
Use your Vizio remote control. Turn your TV on. Press the "input" button until you get to "RGB", which is what you would connect a computer to. Make sure no computer is connected, or it's at least off if it is connected. When you get to RGB, you'll see a message that says "No Signal". After about 5 seconds, the TV will enter a sleep mode and seem as if it has turned off (orange Vizio logo). Once it completes it's little sleep cycle and "clicks" off, wait a few seconds and hit the input button again. It'll go to the next menu item. Keep clicking input until you're back on "TV", and VUALA! The channels are back! 
I accidentally figured this out when trying to troubleshoot, but I'm glad I did. Didn't want to dishout $250 to get it fixed. Let us know if it works for you too!

FIXED! LG DAT-250W INSTRUCTIONS: TURN OFF THE MAINS POWER AT THE WALL UNPLUG ANTENNA FROM THE BACK TURN POWER BACK ON AT THE WALL & START AS NORMAL IT WILL COME UP WITH "POOR SIGNAL" THEN WE FLICKED THROUGH THE CHANNELS & TURNED IT OFF AGAIN AT COMPONENT & AT THE WALL PLUG THE ANTENNA BACK IN TURN EVERYTHING BACK ON Note: **Just avoid the channel that keeps locking up** LG are aware of this issue

They claim that if you leave the set unplug from the wall for about 10 minutes and then plug it back in and ushing the power button the set will auto program all the channels available,Without the remote is possible but not as easy,in the front of the set you have the stop/eject button and the REW button,if you press both buttons at the same time a MENU(display) should come up on the screen,keep pressing action until the CH square is highlighted then use the arrows up or down until antenna is selected the use the arrows left or right to change it to Cable,once is in the cable mode go down one more to auto set and press the arrow to the right and it should auto program all the available channels. I hope I made sense but just in case here is the link to the owners manual http://www2.panasonic.com/webapp/wcs/stores/servlet/vProdSupportResults?storeId=15001 ,it can be done.You can use my name in a new question to let me know how it goes ir if you need more information.

If Im not mistaking , some of Zeniths TV sets cannot be unplugged or disconnected from the wall. It will delete the memory and I guess the default channel is Channel 52.. I didnt know you disconnect the set in the ? you asked before. To stop this simply plug the set into an always on wall receptical and turn on the cable then the TV set. your going to need to do this order of operations as I know Zeniths will detune and you wont get any color sometimes if you turn on the TV then the cable. Sorry nothing you can do short of getting another set. Good Luck