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Flow Chart of Troubleshooting
9-12
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9-1-7. SIM Part
Phone can not access a
SIM card
YES
SIM400: pin1 is 'High'?
(R418)
Check the U400
NO
YES
After Power on,
Check SIM_CLK signal at
SIM400:pin#3inafew
seconds (C447)
Check OSC400 (32KHz)
NO
YES
After SIM card insert,
SIM_RST
signal at
SIM400:
pin #2 is 'High'(C446) ?
Replace PBA
NO
YES
Check the SIM Card
YES
END
VREG_USIM_3V
2
33 4
4
5
5
6
6
G
78
GG
910
G
SIM400
11
2
C447
R418
C445
IO5
6
2
GND
IO1
1
IO2
34
IO3
IO4
5
D401
C446
C449
C448
USIM_CLK USIM_IO
USIM_RST