hi Mohan
Put on a full white screen and check for color uniformity.
Put on a white convergence screen and look for convergence error. I have never seen an epson that does not require convergence adjustment (note to Sam). I have sold / adjusted more than 20 of these PJs.
Sam, that utube video isnt even ball park close to accurate. It is clearly a broken PJ. I have never seen any PJ EVER (after viewing thousands of them) that is even remotely close to that example.
some folks experience a phenomenon known as convergence error and white field uniformity issues with lcd ;-) Each technology has + and -. Good idea on test driving both (but this is normally quite difficult to do).