Mobile Sim Card Problem

IC Power Module (CCONT) works not only for power modules supply all machinery, but also the circuit of communication between the SIM card and the CPU. If the soldering is bad and damage in the parts of the module IC Power (CCONT), trouble with the SIM card, when the SIM card is inserted and the power is turned on, the message 'SIM card is not accepted', if the contacts do not fit in the SIM card socket, show display 'Please insert SIM card'. Other damage that may occur :

* SIM card reader, check whether the slabs on the SIM card is bent or dirty which could disrupt connectivity from the SIM itself, replace it if you feel necessary

* Inspect and test the resistance and the SIM lines to ground, its value is not less than 200kS curren 

* Check and test whether VSIM voltage rises to 3 / 5 volts after turn on your phone. If the voltage VSIM match but your phone can not recognize the SIM card, check whether the SIM lines connected to ground or cut off, also check the mechanical view of the driver's license reader. If the voltage VSIM idak expected to increase in value, replace the IC Power (CCONT). If still wrong after replacing IC Power (CCONT), probably due to a broken path or PCB. 

* If the "driver's license cards are not accepted" LCD display on your phone, but the setting correct SIM lock or no lock driver's license is set, then the IC Audio (COBBA) need to be replaced. Remember that you must rewrite the data SIM lock and tune the value of Rx / Tx after replacing the IC Audio (COBBA)

Simak

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Simak

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