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Is this a projection? If so the internal components could have issues and I wouldn't recommend trying to repair that. If it is a LCD or Plasma if may be an issue with that specific input or cable. Try another input like the antenna or cable input and see if it has the same issue. If it does the issue is again internal. If not than the one input may be the issue. Try replacing the cable or changing the device on the bad input. It that works great if not, you may not be able to use the one input. Also try and unplug the TV for an hour and try again. Good luck!
check cables, make sure all are undamaged and secure. Try troubleshooting different sources of video input (ex. dvd players, satellite boxes, game consoles). If you find a specific device to be the issue and not the tv then post a new problem. Otherwise it is possible that your tv has damaged hardware and requires maintenance and/or replacement.
Can you tell me which Cable box you are using?Which model/region?
The possibility is that the HDCP handshake could not have happend correctly and hence the issue. Try to connect to different HDMI input of TV from Cable box. If possible change the resolution of cable box and check video
Change to DVD or some other input and see if the issue is still there. If it's a TV issue the problem will be there no matter if your watching basic cable or a DVD. If the problem goes away then it's an issue with the cable.
Rarely does an issue like that only effect one input (ie Cable)
try bypassing the cable box and plug the cable directly into the TV if you have a snowy picture you might have a cable issue. Also make sure you can view a movie from a DVD player.If your DVD player does not show a picture then you might still have a TV issue but if it does the problem is either your cable box or it's the cable going to the TV either not plugged in or defective.Also try moving your cable from the cable box to a different input on the back of the TV you could have a issue with only that one input (video source).
Try swapping some cables around, like the skart lead from the dvd(if scart) for the cable one, if the picture problem swaps with the lead then thats the problem. If it doesn't try settings on the cable and tv, if the cable is sending nvbs signals and the tv is set to pal then this can also occur.
check to see if you have it on the correct input with cable connector channel up or down. the fact that you have picture on other inputs tells me the signals not getting through somewhere. and it possible its not being routed correctly. so try changing inputs on remote also try searching for channels with cable plug up to it. Physicaly there may be a tuner issue.