Have wavy lines in picture sometimes-could this be

On the signal board there is 4 surface mount transistors. There is one right by the input board (BA09), i would check the corresponding caps and diodes close to it also. I would replace all of the 4 transistors. If this SMT starts to go you will see wavy lines in your picture than it will go away in 3 min or so and get worse over time until no picture is seen. When it totally fails you will have no inputs what soever but you will have an OSD screen and when you choose DTV you will get a scrolling picture.