Does it have sound?If not there is a small surface mount fuse on the video board that needs replacing.To do this on most mdels the LCD display must be removed to access the video board.NOT a DO it yourself job!
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What type of antenna are you using? Or what is your source for accessing channels? (i.e. - are you connecting to a cable tv service box or are you using a receiver ect.) Make sure that your source is connected to the input method that you are currently using on the tv.
There are many input methods to choose from in the settings of the tv. They are generally called antenna 1, antenna 2, cable, aux, hdmi - and a few other names. There should be a button on your remote to change them. The function is usually called "source" or "input". Press that button to change the input method until you get a picture on the tv or pick up some sort of reception. when you have the tv set on the same method of input that your antenna source is connected to, you will get channel reception or some sort of picture. Thats when you use the menu functions to auto find channels for you and let it go through its checking scan to report how many it has picked up.
If its running the scan for channels and not locating any stations, and the picture is either scrambled with the white noise sound tv's make when off channel or if its just single color screen without any sound - then you know the antenna input method you have chosen on the back of the tv is not the current method set in the settings under the menu key.
Most of the time the inputs are labeled on the back. If you look under the cable antenna connection, it should say "cable" somewhere in small print - or "antenna 1 input", antenna 2 ect. Look on the back of the tv. If you are using RCA jacks that are labeled right and left for sound and a third connector for video ect, look for the name of the input method of those three connections on the back of the tv. It should be marked as input - aux 1 ect. Then just change the source chosen in the tv to match it and have it auto program your channels.
If you are using a Cable Box, then select the Cable Box option in the TV. If you have connected the Antenna directly to the TV, then select the Antenna option in the TV under Menu options. Try performing the Auto program.......If using a Cable Box, then no need to perform the Auto program. If the issue persists, try resetting the TV to the factory settings and check if it helps.
Be sure your tv is programing with a correct signal. Air or cable channels, and that you do have a line going into the RF connector [antenna signal]. If you have a satellite or cable box your tv will only tune to channel 3. Also, if you are logged into a dvd player or vcr...you will only have one channel memory. Remove any of the external players [games,dvd,vcr etc.] And retune with auto program!
This happened to me a few years back so I apologize if it's not 100% accurate. If you can get it to work on another TV, go ahead and connect it to that, and go in to the settings to select the video input. If it's connected through an HDMI cable, then it will probably be set to HDMI. Change the input here to whatever cable you used in the living room. You will have to power it off at this stage, but when you connect to the other TV it should work.
Check first the antenna using another TV. If there is no other TV available, check using an ohmeter. If you are 100% sure tha the antenna is ok then the antenna connector on your Tv is not making a good connection to the antenna plug.