Page 74 - Electronic Mechanic - TP - Volume - 2
P. 74

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
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