Samsung SM-G780F Common Service Manual page 66

8. Level 3 Repair
8-4-5. SIM/SD PART
T-FLASH CMD / DATA / CLK
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SD Card does not work
Check if the SIM/SD
socket has damaged
No
Check the voltage of
C3029, C3030 = 3.0V
Yes
Check the signals
(L3026,ZD3024,R3018)
Are there any problems?
No
END
Yes
Replace the SIM/SD Socket (SIM3002)
Abnormal
and check U7009 (Crack etc)
Yes
Check UCP5000 (Crack etc)
Change the SD Card.