question about 1997 zenith tv bigscreen?

I have gotten a 1997 zenith bigscreen tv and do not know much about it. The screen is still visable and viewable but it is blurry. It was moved to my home and I am wondering if that has anything to do with it. Is there something that I can do to correct this. I heard if you take the front speaker box off you can correct something from there as well... but I do not know how to take the cover off... can you suggest anything??