Help! most of my blu-ray titles look very grainy

[Lsalas76]

Ok I have a 61" Samsung 1080p DLP TV ( HL-S6167W) and I have a ps3( had it since December). I own the Prestige, Happy Feet, Planet Earth, Enter the Dragon and the Departed. Most of them look extremely grainy, even PE. The only one that looks great is Happy Feet. Btw, I do have my PS3 connected via sony HDMI cable. I have rented The Pursuit of Happyness, Kingdom of Heaven, and Rock Balboa from Netflix and those all looked very grainy and bad too. Although Kindom of Heaven did look some what decent.

I also have dish network HD and the PQ on most of the HD channels looks great. The Dish Network reciever only supports 1080i. I don't know if the problem lies with my ps3 or my TV. My ps3 games look good so I assuming it might be my TV since I bought it open box from Sam's club

How would I know if I have to replace my lamp or mirros and or color wheel on my TV?

thanks in advance for any help