Default How to disassembly Acer S200

Hi i have to change the touch panel,but i don t know how to take apart this phone...I ve unscrewed the 5 screw under the cover,but nothing seems to happen,the cover is strong as before.Is there or in the earth someone has taken apart this phone before me?I want to make a guide with high definition internal pictures,because no one in youtube,google or internet had any picture of this device disassembled,even no service manuals or internal documents from acer.
So please help me,any information will be great