Iphone 3GS glass is fine, burn marks under it?

[kcinokc]

I replaced my charging dock and had to reopen it. A number on top of a connector had come off and some of the sticky was left. This connector stuck to the back of the top piece I was trying to remove. My glass screen is fine, but no picture or icons show up..there are a couple burn, oil on water looking marks. Do I need to replace the LCD? I had ordered a replacement screen digitizer, but it does not include the part I am talking about...The black screen under the glass. Is there a chance it will work with the bad spots or should I just order an LCD, if that's what this part is called. Thank you