Need some help please!

I posted this elsewhere but prob was in wrong place. I just got a new Sony KD30xs955. I have hooked it up via HDMI to my HD DVR box. Now HD channels come in awsome!!! But other channel's come in looking grainny or pixelated, I was wondering why this is and how I can fix this...please any advise will help it is very annoying!!!

Make sure you are viewing the SD channels in 480i/p mode. Also try viewing the standard definition channels via component to see if that makes a difference.

its a common problem when people first get a hd set. if your talking about sd then you gotta look at it like this. your old tv was might have looked better because it wasnt strong enough to see all the defects in a sd picture. you hd is like a magnifine glass. it picks up everything. even the problems in the picture. some sd channels will look alright others will look like crap. there is nothing you can really do about this problem except get used to it. i felt the same way but now i dont even notice or care about sd channels. what model dvr box do you have? who is your provider comcast, adelphia, sat......?

if you have comcast they are changing to all digital. we have it here and it will improve the picture on sd alot. also listen to the last post and make sure the sd is set to 480i.

Thanks for the replies much abliged. My cable provider is TWC in nyc. My Dvr box is the Scientific Attlanta Explorer 8300.

On the box when i change channels, it lights up different reseloutins depending what channel i am on. Sometimes it says 480i sometimes 480p and sometimes 1080i. (the HD channels some say 720p) So how owuld i change it to only 480i for SD channels? where searching my cable box options all i see is where it ask what reseloutin does your tv support and i have it on all of the above.