Mobile phone repairing trainning Information about latest BB5 IC

Work Of Different ICs :


1. PFO : The main work Of This IC is to amplify the signals so that they 
can travel a long distance. The PFO can transmit signals upto 25 Km in an open area. It will always be with the antenna switch
Problems if PFO gets damaged :
(1) Network Problem
(2) Battery Discharge Problem
(3) Mobile will become dead

2. Antenna Switch : The main work of
this IC is to recognize the frequency of the Sim Card and activate it.
Frequency ( 900 MHz / 1800mhz)

Problems :
(1) Network Problem
(2) Only one frequency will work. 900 Mhz or 1800 Mhz or1900 MHz


3. Network IC : This is the main IC of the Network Section. It
processes all the signals during a call. It controls the entire network
section. It will be always be with the crystal.



Problems :

(1) Network Problem

(3) Mobile Phone Dead


Different Names Of BB5 Ics