Samsung SM-G975F Service Manual page 82

8. Level 3 Repair
8-4-4. SIM Part
Insert SIM card
Is SIM socket ok?
Check the SIM Voltage.
(C4028,C4030) 1.8V or 3.0V?
Check the SIM RST / IO / CLK.
(SIM1 : ZD4008, ZD4011, ZD4009)
(SIM2 : ZD4005, ZD4007, ZD4006)
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Yes
No
Yes
No
Yes
No
Is signal ok?
Yes
No
END
No
Change the SIM card. If the SIM card is
No
still not working, check the U12003,
U5014 (Crack etc)
No
Check the UCP5000 (Crack etc)
Replace SIM socket