Sim Detect Trouble - LG TU750 Service Manual

4. TROUBLE SHOOTING

4.3 SIM Detect Trouble

SIM control path
- Asta generates SIM interface signals(1.8V level) to AB3000.
- AB3000 converts SIM interface signals to 2.75V.
START
Reconnect SIM card
SIM work well?
N
o
Resolder J201 on main PCB
and check the contact
between J201 and SIM card
SIM work well?
N
o
Change SIM card
SIM work well?
N
o
Change main board
LGE Internal Use Only
Yes
Finish
Yes
Finish
Yes
Finish
- 82 -
J201
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