Nokia 6310i is my last repair for hardware !!!

Nokia 6310i is my last repair for hardware !!!
I charged the battery completely then when I make a call,
just during the first minute the battery become low and the turn off the phone.
By the way I replaced a new battery.
I asked a friend about that problem, he told that I have to remove and reinstall the PF
because that maybe due to the PF consume the battery.
Then I did what he told me but now ( NO network ) at all.
and some of the small capacitors and resistors around the PF moved
and I think that I returned them back in them places but not sure exactly.
So what I should do now?
someone will say replace the PF and then will see!!
For your info that PF isn't available in the market .
I'm very sorry that I made this story and make all of you read it, but I need your help and advises. :-? :-? :-?

Dont give up so fast....U must practice more...the time will give U that opertunity...I hope Uve changed the PA with a broken one..get some training on a broken phone...changing chips..And when U are sure U got the skill change the PA again with a brand new..
Good luck!
Regards!
Sergo_Zmeia