I think this problem can be easily solved with the help of Samsung help center .You have to try this at least one time.
I bought a UA40D5030 samsung LED TV a month back. Whenever I play any HD movies (720p or 1080 p/i) from my USB drive (Pen Drive & HDD), I see that the screen becomes wavy.It is as if the waves are moving from bottom of the screen upwards. The problem is more evident during dark scenes.
I contacted the Samsung service and they tested by replacing both the IP board and the AV board with new ones but the problem still persists.They have no clue how to resolve the problem. Kindly help what else can the problem be ?
Also, since I am on warranty, can I ask for a replacement of the set if they cannot resolve the issue ?