Yup - I have the same problem. Got an LN52A860 and also get the flickering when using the component cables and setting the Wii to 480p. 480i works flawlessly using the same cables. To be honest - I can't see that much of a difference between the 480i and the 480p displays - - - must be my old eyes!!

Probably read the same forum messages as you as other people are having the same problem. Haven't figured out the cause yet nor a solution.