I own an LG 32inch LCD TV. Lately, I have begun to notice that each of the devices which I have hooked up via HDMI show strange pixelation around edges. This is especially noticeable whenever there is a white image on screen. The vertical edges of the white images seem to be running up and down. I have a PS3 and Digital Cable both hooked up via HDMI. I have tried 3 different cables and tried the various combinations in each HDMI input on the tv with no success. When I change my connection to Component or A/V, the pixelation disappears.
Any thoughts would be much appreciated.
Cheers.

Welcome to the forum, you may want to post this in the LCD Flat Panel section and/or search there to see if anyone else is having similar problems.

What is the native resoloution of the TV and what resolution are you sending to it?
Is overscan enabled or disabled over the TV's HDMI interface that you are using?

Try turning off 1:1 pixel mapping in the TV. Use 16:9.