Mobile Phone Hardware Repairing ( about faults comes with IC )

Mobile Phone Hardware Repairing ( about faults comes with IC )

We can divide all Mobile phone damages as Hardware , Software and Settings faults. when we think about hardware damages or faults mainly we want to know what are the main ICs and faults comes with IC. Old phones had ICs more than latest phones. However when you get complete idea about that ICs then you will be able to find solution for damages in your phone properly.Check following list of ICs and try to understand about that faults.

Power Amp

Antenna Switch

RF Processor (hagar IC)

Power IC

CPU

Charging IC

Flash IC ( ROM or EEPROM)

Oscillator (VCO)

Sim IC

Key Pad IC

LCD Light control IC

Power Amp
This is a very important IC for Transmiting signal(Tx) in your phone. This IC is work as a Tx amplifier and it get high voltage directly from the battery.When it is damage we can see following faults.

Signal Drop

No Network or Access

Battery low quickly

Cant make a call ( Tx not work properly )

Power on failure

Phone will heat

Antenna Switch
Antenna switch is help to filtering frequency Bands as 900Mhz , 1800Mhz and connect Rx ,Tx( Receiver and Transmitter). Therefore when damage this IC we can see faults as following.

Signal Drop

No Network found

Some Frequency band are not worked properly

RF Processor ( Hagar IC)
RF( Radio Frequency ) Processor is a main IC in your phone PCB. This IC is used for processing Rx and Tx signal ( for Modulating and Demodulating). sometimes it make a low frequency clock signal is used to start CPU functions. Therefore when damage this IC we can see faults as following.

Power on failure

Signal drop

No network

Caller drop

Rx or Tx or both are not work properly

Battery empty quickly and phone will heat

Power IC
Power IC distribute current to all the components and IC in PCB. we can think that, it is work as voltage regulator therefore if it is worked not properly phone will not be power on. specially we can see some times some applications are not worked because of Power IC is damage.(when power ic not distribute current for circuits that circuits are not worked).

Power on failure

Battery empty quickly

Phone will heat

Insert Sim

No Charging

Some applications are not worked properly

Auto Restart

CPU (Central Process Unit)
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.

Power on failure

Auto Restart

Commant not accepted

KeyPad not working

Battery empty

Phone will be heat

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 controll IC.

Flas 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 follwoings.

Power on failure

Booting faults.( only booting screen)

Phone will stuck

Battery empty quickly

Some applications are not worked( camera ,Mp3,Video Bluetooth ...etc )

Phone work as a unconditional

VCO(Voltage Controll 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.

Power on failure

Signal faults

SIM IC
This IC is used for controlling SIM card data. when it is damage you can see following faults. This is a crystal IC because of that when fallen down your phon like this IC will be damage easily. Therefore we can say following faults are common faults in nowadays.

Insert Sim

unablet to power on with sim card

Sim not accepted.

Key Pad IC
This IC is used for Controlling Key pad circuit.We can see this IC as crystal and normal type.because of that when fallen down your phon like this IC will be damage easily. Therefore we can say following faults are common faults in nowadays.

Key pad not work as a order

Key pad stuck

When power on one key is dialing continuously

When press a key phone will shut down or restart

Key pad work as a unconditional

LCD Light control IC
This IC is used for controlling keypad and LCD lights. We can see this IC as crystal and normal type. when this is damaged we can see following faults.

Key pad lights not work

LCD lights not work

White Display

Display not work

When you see like above damages dont try to do remove that ICs. Because there have a method for solving any faults in mobile phone. Therefore firstly try to understand about mobile phone ICs and about its works and also damages.

Posted in: Diagrams,Mobile Phone Repairing Notes,Solution