Re: weak signal showing on my l e d samsung haven't used...
Try to double check the power cable is well connected if so you have to know that some screens come from the factory with some problem and in this case you have the right to replace it from the seller.
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yes its a cable box problem, find the channel you are having more problems with,press guide in the cable box remote and you will see how the box where the video is will still have the problem and the guide with channels info its going to be clean,
100% weak signal
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.
Since my problem (Samsung/Comcast) began with a channel selection button pushed on the TV remote when it should have been pushed on the cable remote, I figured the problem lay with the TV. Although I was getting the "weak or no signal" msg., the actual signal strength bar graphic showed it to be strong. Disconnecting did no good. I surmised that the TV was simply not recognizing the box.
I looked at the manual for my Samsung 750 model.
Page 20 discussed "Selecting the source". I accessed the TV menu and selected "Input", then chose the "HD..." item from the highlighted list. Voila! My tv works again.