iPod Touch 2G LCD still white after replacing with new one.

My iPod Touch 2G stopped working one day. The screen was all white. I replaced the LCD screen with a new one but the screen is still white. I have not replaced the glass front yet in case I need to replace something else. It will connect to my iTunes and restore, but still white screen. I don't know how to tell if it is a bad LCD or the mother board. Do I need to fully connect the front glass and digitizer for it to show a picture on the lcd? I did get the LCD on Ebay, so not sure how to tell if it is good or not.