LG GT500 - SIM Detect Trouble

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
y SIM control path
- DB3200 generates SIM interface signals(1.8V level) to AB3100.
- AB3100 converts SIM interface signals to 3V.
SIM works well?
Finish
START
Yes
Reconnect SIM card
Resolder J800 on main PCB
and check the contact
between J800 and SIM card
Change Sub board
SIM works well?
Finish
Yes
No
No
SIM works well?
Finish
Yes
No
Change SIM card
< Sub Board >
J800
4.3 SIM Detect Trouble
5
VPP
J800
3
CLK
GND
4
7
GND1GND2
8
6
I_O
RST
2
VCC
1