As such it's unlikely to be sure if this can help. Try http://www.ehow.com/how_7362493_change-sony-startup-logo.html
My 1 week old Sony Bravia TV was working fine until a day ago. i.e., whenever it was switched on, it used to show the SONY logo in the beginning. But now something is wrong I guess and it is not showing SONY anymore.
I did the factory reset, but nothing happened . I know it is not a big issue, but still that is something that one dosent expect can happen. Could it be some virus threat; I have no idea. This sounds silly, but its still annoying.!!!!!!!!!