Everything was fine except oxidation, my father is fixer of electronic and mechanic devices, like TV, Audio, Video and many other devices so with Sony Ericsson K800i disassembly we haven't any problems, he cleaned like I say "oxidation", which was on and near connectors.
P.S. it looks like white color spots, most of reason is damp. Became nonconducting.
simox and Loz - thanks for help.