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Check
R2212
for SMT issues, and probe the detect pin's
below.(1.8V)；
If detect pin is high when tray inserted (normal),
1. Probe SIM1 power
SIM inserted. Check
2. Compare the impedance of UIM1_CLK、UIM1_RESET、UIM1_DATA[SIM1] or
UIM2_CLK 、UIM2_RESET
3. If any unusual impedance issue,
the signal to check any open circuits (check each net).
4. Remount the PoP if no open circuits.
724 SIM test fail-BMMI
VDD_SIM(1.8V)
or SIM2 power
U5401、PU8401
、UIM2_DATA[SIM2] to normal PCB.
reheat PoP;
VREG_L10A_1P8
for any defects if any power unusual.
If still NG, demount PoP and probe
C2212.1
status shown
when either
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