Samsung SM-A526B Service Manual page 27

8. Level 3 Repair
8-4-4. SIM Part
INSERT SIM CARD
Check voltage of SIM card
(C7052) 1.8V or 3.0V?
Check SIM RST / CLK / DATA.
(SIM1 : TP7023, TP7022, R7014)
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YES
예
SIM is OK?
YES
YES
Signal OK?
YES
END
NO
Change SIM card.
NO
If sim card does not work after change,
check CN7000 (Crack etc).
NO
Check U4000 (Crack etc)
Swap SIM socket