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Re: Actually it a lnt5271f, but...
There is a differnece between other TV's in the house working and the TV at that specific location working. Check the cable splitters which go into that room and tighten the cables at all ends..loose/broken cables cables can result in weak signals. It might be a bad splitter too.
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Ur tvs in ur house it is getting a paid tvs incomming broadcasting tv signals like a cables or a satalites dishes companies?Yes,than that incomming broadcasting wire that plug into ur tv Ant. input port hole might have some kind of signals interference at that channel frequencies,call ur cables tvs or satalites tvs companies providers for an answers and get their field Tech. to come out and check it out.If all ur tvs in the house are analoge tvs and u are using a DTV signal through a DTV converter box to getting a Free over the air DTV air to recieving tv broadcasting tv channels stations only than tries it with another antenna signals sources like a better antenna design like a portable digital antena or good roof antenna should solved this problems.
With the onset of more and more TVs being hooked up to cable, TV manufacturers didn't need to make the tuners as sensitive because the signal from the Cable Co. was much stronger than the over the air signal. If the other TVs are older they may be just sensitive enough to lock onto the channel signals. You could ask your cable provider to check your available signal in the house to see if there is the proper amount of signal. Some channels can inherently be stronger and when "block converted" (put where the cable company wants the channels) all come thru but some are a bit clearer.
unhook 1 tv at a time leaving 2 tvs each time hooked up. try every combanation Possable to see if it's a tv problem or if when you have all 3 tvs hooked it makes the signal weak. this can happen cable guys say no but it can been there done that. if 2 works and 1 dont in every combanation the problem is in the cable system. most cable guys check the signal outside. with the splitter block unhooked. this gives a false reading.
This problem requires you to test both the monitor and the signal input form you cable tv setup. Set the monitor up on a computer and see if it works properly. If it does then you may have a problem with the signal conversion of the cable tv to the monitor. It also could be a weak signal that drops below the monitors sensitivity levels. Have your cable tv repairman check the signal levels on your lines. Another way to test this is to hook up is with a different monitor to test your setup and see if it works. If after testing you find, the monitor does not work properly, then you need to have it serviced. Hope This Helps.
This is due to either weak\no signal, or too many splitters. How many TVs do you have and how many cable boxes? I've had this happen where squirrels or other critters will walk across\chew the lines coming into the house and then rain will affect signal up to 90%. My internet would work but the TV would be off. Most likely it's a wiring issue, you may have to wait for your provider to visit.
If you're connected to a digital cable box, I would try using the external component connections and bypass the TV's tuner. If all you have is straight cable coming into the house, it could be the cable signal itself or a defective tuner in the TV assuming all the menu settings are correct in the TV.
Your cable line coming to the house may be fine, but each device has a section of cable running to it separately. This will be coming from one or more splitters leading from the main cable. Follow the cable line that leads to your new problematic TV, to verify that both ends of the cable are firmly connected.
If you use a cable box then send the signal to this TV, be sure you have the cable/cables correctly and firmly attached/seated in order to get the full signal strength.
Also make sure that the cable is sound and not damaged or frayed in any way from end to end.