Is this happening on all inputs? Do you have a cable/sat box connected to the unit?
I have a Samsung LN -T4061F model I bought two years ago. Over the past two days I have noticed that the TV picture jumps every few seconds. In the trouble shooting section of the manuel it says to adjust the course tuning and then the fine tuning to fix the problem. However, I cannot find out how to do this anywhere in the manuel. I found out how to adjust the fine tuning but that is only for individual channels. I need some help on how to fix this problem. Thanks in advance for any help.