Page 74 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

CPU (Central Processing Unit)/Processor/Microprocessor

Central Process Unit is the brain in your mobile phone and controller all commands which we have given. Specially
this IC check flash IC before booting mobile phone after that it will give command to Power IC. When it damages
we can see following faults.

i Power on failure
ii Auto Restart/Reboot

iii Command not accepted
iv Key Pad not working or responding
v Battery empty
vi Phone will be heat

vii Phone will stuck
Charging IC
This IC is not a common IC among latest phone. However it is used for controlling charging. when it is damage
we can see charging faults like these No charging , Not Charging , Auto charging or Charger not support( Bad
contact charger). Nowadays Power IC ( UEM) working as a charging control IC.
Flash IC ( ROM or EEPROM)
This IC holds flash or booting information (program). When this IC damage we can see software problems in your
phone as followings.

i Power on failure

ii Booting faults.(only booting screen)
iii Phone will stuck
iv Battery empty quickly
v Some applications are not worked(camera,Mp3,VideoBluetooth...etc)
vi Phone work as a unconditional
VCO(Voltage Control Oscillator)

VCO is the RF signal generator. It makes clock frequency which is used to run digital components. When this IC
is damaged digital components fail to work and the result is power on failure.
i Power on failure

ii Signal faults

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CITS : E & H - Electronics Mechanic - Exercise 134