Sim Detect Trouble - LG AT&T GR500 Service Manual

4.3 SIM Detect Trouble

SIM control path
- DB3200 generates SIM interface signals(1.8V level) to AB3100.
- AB3100 converts SIM interface signals to 2.75V.
START
Reconnect SIM card
SIM works well?
Resolder SIM socket(J700) on main PCB
and check the contact
between J700 and SIM card
SIM works well?
Change SIM card
SIM works well?
Change main board
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Only for training and service purposes
Yes
Finish
No
Yes
Finish
No
Yes
Finish
No
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4. TROUBLE SHOOTING
J700
LGE Internal Use Only