Level 3 Repair
8-3-8. SIM Card Working
Insert & Operate
SIM card
NG
NO
SIM FPCB
Change SIM400
Break down?
YES
No
Yes
C450
Check
= 3.0V
Q400
Yes
Resolder
Change
Q400
U401(PMIC)
Check SIM400
& Neighboring Circuits
8-31
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