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check the cable that connect from the box to TV if it's probably connected

Before fixing this issue turn off the machine completely and make sure from the plug. Ok now take batteries out of milk. You have hit a combination of buttons and your remote this is called a jamremo set and your TV manual probably won't cover it. Although it is a simple fix. Just go out to an electronics store and buy a universal remote and you can simply turn the TV back on with this new remote and click Menu and it works fine.

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.

on your remote control there is input button. Press that to the tv level.
There are other settings for box tops etc

If the cable from the cable box is attached to the TV via a coax cable, then all you need to change the TV channel to either Channel 3 or Channel 4. You may have accidentally push the CH button on the TV remote. Please post back what you find.

try to go to menu then change your tv air to cable std or irc then click channel search..

THIS HAPPEND TO ME BEFORE MAKE SURE ALL OF YOUR LIKE SKY CABLES OR DVD SCART LEADS ARE FULLY CONNECTED TO THE TV ANF HAVE NO TEARS OR RIPS ON THE CABLE AND ALSO MAKE SURE THAT THE TV IS ON THE RIGHT AV CHANNEL BECAUSE YOU COULD HAVE CHANGED THE AV REALLY EASILY BY MISTAKE

This is the best solution for your problem as a 40 year experience with wires etc. Go to the source of your cable signal connector . Open it and clean the terminals with emery paper , sand the end of the cable shiny clean from corrosion , get a new barrel connectors with gold terminals if possible lengthen the ends of the cable , insert and tighten good, use thick rg-16 or rg 40 cable with good insulation ends crimped professionally with a crimpier or buy ready made , not from dollar store. Get a gold plated professional splitter if you need one or two , it will cost about 15 or more each . Make the cable runs as short as possible, using the thick good cables. If needed get a signal magnifier. From radio shack or the source etc. Connect them good and tight . Ground the splitters . Problem solved , you will get crystal clear channel 2 to 7 including 3 and 4 . Isolate the TV cable from other cables and power wires. Vitally

Your problem is likely not your TV. It's due to the signal being provided by your cable company. I suggest that you contact the cable service provider which you are using and advise them of the problem.

Can you confirm that you didn't have any input signal? My wife once accidentally pressed the reset button on the remote and the TV was stuck in this state. I tried to hook up an antenna to the digital antenna input and let the TV search for a channel. It did find a station and got out of the channel search mode, which was all I needed. Then, I unhook the antenna and continued to enjoy my DVD movie. I didn't check the manual. So, it's possible that there is a better solution. My TV was working fine and I think it just has a terrible user interface. I'm not sure about your TV's condition, though.