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My Vizio VX20L Flat HDMI TV shows "No Signal" that dances across the screen searching for a signal but never pick one up. I switched satellite boxes to another HD TV and it works fine.
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Unless you are using an outdoor aerial on the roof and the signal via a aerial cable, your signal is not provided by 'Channel Scan'. In most homes, your television comes from a Cable Box or a Satellite box. The signal from those is fed to the television via an HDMI cable. On your remote, find the Source Button and scroll though the HDMI socket inputs.
Try going to your input button on your remote and see if you are still on the right input like if your tv is using a hdmi cable from your cable or satellite box then your input should be hdmi or hdmi 1 or hdmi 2 etc... also if you have cable or satellite make sure you didn't change the actual tv off of channel 3 or 4 whichever you have your cable or satellite box set on. I hope this helps.
If it says "searching for satellite" the problem is in your satellite receiver, not the TV. The TV is working. Its showing you the signal coming from the sat box. The sat box is the tuner and is responsible for the sat signal. The "searching for satellite" is a common problem after lightening issues. If you have multiple sat boxes, then swap this one with another that you know works. If this is your only box, call your provider as it means the dish LNB or the sat box was damaged by the lightening. Also have the wiring checked for bad grounds due to an improper install.
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Check all the signal cables at the backside of your Vizio for firmness. If there is any loose or bad cable connection, especialy with HDMI; will poise this problem. Check the input selection also. If improper input selection is done, there will be no signal logo will fly around.If you have selected TV instead of HDMI, when HDMI is connected and you want to see the programme, is an example of improper signal selection. Check these. OK.
One board takes in the HDMI as well as the other signals. Sometimes part of the board breaks and that is what sounds like has happend in your case. This is a fairly common problem and most people tend to just live with it. Others sell thier tv and a few find the number of thier board to see if one is available on ebay or shopjimmy. If you are comfortable with electronics the board is not hard to replace.
If you are connected to a high definition cable box or satellite tv box you would not need to turn to channel 3 on your television. The television would need to be in the right input either component or hdmi. If someone connected the tv to the cable box or satellite tv box with a coax cable like an antenna cable then the tv channels will be available on channel 3 as well but they will not display in high definition. You change channels with the cable box/satellite tv box remote control. If the above is not correct and you are only connected to an antenna cable and not to a cable box or satellite tv box you will need to complete a channel search from the tv menu. It sounds like you are using a cable box/satellite tv box and that the tv is on the wrong input. If the cable box/satellite tv box is not working (i.e. just a black screen) on your television than that is a different matter entirely.
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