My sony bravia kdl-52xbr4 has a chip in it . looks

Sadly, a replacement screen itself would cost more than the TV is worth.

Here are a couple of web sites selling the replacement screen:

http://www.partstore.com/GetModel.aspx?MfgName=Sony&BrandName=Sony&ModelNumber=KDL52XBR4&SearchTerm=True&Page=1&SortBy=price&SortDirection=desc#PartsearchSKUList

http://www.encompassparts.com/products/?1-802-490-31

http://www.encompassparts.com/products/?1-802-490-32

I know it seems like a crazy price. But, TV manufactures buy a mass quantity at a lower price. Where buying just one screen panel cost an arm and a leg. Buying a new TV is the best choice money wise.