C55 no network...

Hi!
I have one c55 killed by some qualified guy...the phone comes with network search every time...pity that I cant find a new PA to see what will hapend if I change it...any way..some one ever saw something like this in c55 series...is it RF part problem....I know for sure that c55 series has a technology problem with the flash chip /bad soldering/ but I cant do nothing with this phone ... I tried flash unlock, everithing posible with software and no result...anyone got idea bout this problem...
Thanks and regards!
Sergo_Zmeia