How to Fix Grainy Cable Pictures
There are picture quality differences between various channels on your cable television system. Even so, all of the channels should be of good quality all of the time. If only one channel has grainy pictures, it is most likely a problem coming from the cable television system itself and there is not much you can do about it without calling the cable company. If a lot of the channels are grainy, there is a good chance that the problem is right there in your home and most likely right behind your TV set. There are some simple troubleshooting techniques that you can use that may save you the hassle of waiting at home for a cable TV technician to show up.
Make a physical check of the cables serving your television receiver to see if the connections are tight. Tight means that they have been screwed down very tightly. You can check this by tightening each connection with your fingers. Also, sometimes the cable is slightly pulled free from the connection. This can happen if somebody trips over a cable that is lying across the floor. By simply holding the connection with one hand and pushing the cable back into it with the other hand, you can often restore the cable to good working condition.
Tighten the coaxial connection on the back of your television receiver. Make sure to push the coaxial back into the connector just to make sure it has not pulled loose.
Tighten the connections -- both the input and the output connections -- on the cable box, which feeds signal to your television receiver. Make sure that both connectors are tight and that the coaxial cable is pushed into the connector.
Tighten any other connections that may be present -- for example, along the baseboard of your room or the wall plate connection. It is unlikely that the connection behind the wall plate has come loose.
Visually check all of the cable to make sure it has not been damaged.
Call the cable company if you have been unable to correct the problem. The cable customer service representative will walk you through additional troubleshooting techniques and attempt to fix the problem without sending a truck and technician to your home. Chances are that any minor problem can be corrected this way.