After Insert the SIM
card the boot does not
recognize
Check whether the normal
operating current
Check SIM card of each contact
has no elasticity or weld
Check whether the signal is ok
Check whether the normal
working voltage VSIM SIM
card
Check SIM card
peripheral devices have no
weld or short
circuit
END
Check the related devices have no
short circuit
To replace or re welding of SIM
card seat
Check PMU processing the fault
point
Check PMU has no weld or
damaged
replacement of devices or welding
Y
Y
Y
Y
Y
Y
N
N
N
N
N
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