Phone can't access SIM card Yes Check the pin K12 of U101. voltage 3V ? Yes Check the SIM connector's (CN802) connection to SIM card Yes No Check the circuit related to U101
No
Resolder or change CN802
Check the circuit around CN601,803 input circuitry Yes
Check the Connector To connector FPCB(GH59-01482A)
Check the circuit around U201 output and vlotage supply circuitry