HELP!! pls

Hi evry'0ne, thanks 4 ur gratifying solutions

i flashed my SE k750 to a w800i then decided to dissasemble the k759 casing and replace it with w800i casing.

unfortunately, after this, my fone does not emit network signals in many places but fluctuates inconstistently.

pls help me wit useful clues.
thanks in anticipation.

You should help yourself with pages, that are here:

Disassemble a Sony Ericsson Mobile Phone

and

Sony Ericsson Schematics

Nice day

you should check did you make it well