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SIM card detection problem
Step
Check point
Result value
Defect point
1
Confirm the defect symptom
-
-
2
Check the SIM socket & Connector
Broken, dust, corrosion
SIM socket
Normal
Go to the next step
3
Power on with a power supply
(power supply voltage : 3.8V)
-
-
4
Check the signal of R618 for SIM601(UIM1)
R629 for SIM600(UIM2)
Notice. It should be measured when the phone
is started
3V or 3V clock
Go to the next step
If not the correct value
Call Processor
(UCP300)
5
Check the signal of SIM socket pin1 (C636)
(C640)
Notice. It should be measured when the phone
started
3V
SIM socket
If not the correct value
PMIC (U401)