guys thx for all your support. yesterday i went to several shops, some guy really set me up but i bought a new usb circuit board and replaced it, it doesnt say high voltage now, home button is not properly working but the menu and back buttons are just fine.
what I'm gonna do; I'll put the motherboard in a jar full of rices, and maybe I'll put the motherboard into cellulosic thinner for couple of hours, then I'll dry it out in the rice again.
What do you say? Phone did work, and I didn't see much oxidized places in the motherboard at all.
Tell me what you think is nessesary and I'll do it.