LG GD580 - SIM Detect Trouble

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Only for training and service purposes
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4. Trouble Shooting
4.3 SIM Detect Trouble
y SIM control path
- DB3150 generates SIM interface signals(1.8V level) to AB3000.
- AB3000 converts SIM interface signals to 3V.
SIM works well?
Finish
START
Yes
Reconnect SIM card
Resolder S601 on main PCB
and check the contact
between S601 and SIM card
Change main board
SIM works well?
Finish
Yes
N
o
N
o
SIM works well?
Finish
Yes
N
o
Change SIM card
< Main Board - Bottom side >
S601