TV WHEN WATCHING CABLE TV PICTURE IS OFF AND ON. WHY?

Check the interconnection cable. Try a new one. Check whether proper source i selected with TV. Check whether both VHS and TV powered ON. Gopakumar Gopalan Google

Check the cable and connections between the TV and your cable line. Make sure the contacts are clean, no bent pins, etc. Try replacing the cable if possible.

may be the source itself(i.e. cable box) also check cables between cable box & TV. If you are connecting the DVD to the same input the cable box is installed, You know that input on the TV is OK. If you get no audio when the DVD is connected to the same input as cable box, then issue is the MAIN PCB.

there is sinal interferences from laser products pc mobile transmitters or video games get high quality vcr and cable tv cables move or switch off any video games cd players energy saving lamps or pc and microwaves n motors like pumps change the position of installation of cable and antenna to avoid path of interference

check your input cable

Yes,but must have cable,satalite,or telecom signal.

Is your video input (from cable or satellite or fiber optic, etc.) coming from a coaxial cable, a component cable (red, green, and blue connectors), or an RCA cable (yellow connector for video)?

If you can, try an alternate input method and see if that makes a difference. Does it happen when watching DVDs or tapes, or when playing video games, or just when watching television?

Often you will get a bluish or reddish looking picture if your wires from your cable box/satellite or DVD player are inexpensive RCA type video cables. Try using a nice set of component cables or HDMI cable from your sources to your TV. If this is your setup, try this first...its the most inexpensive first option.

Did the cable person take a reading on the signal level at the cable outlet on the wall and did the cable person check the TV setting to make sure they are correct. TV could be set on the wrong channel also.

sounds like the dvd players set for differant picture format like full screen compared to wide screen settings. Look in the Menu of the tv as well as the dvd player