Sim Card Trouble - LG KE820 Service Manual

5. Trouble shooting

5.10 SIM card trouble

Check Points
-Power control FET is working
-Socket soldering
-Proper SIM is used
2V85_SIM
S
_SIM_EN
G SI1305-E3
Q301
D
R320
4
GND
4.7K 5
VPP
6
SIM_IO I_O
C308
27p
- 94 -
J301
1
VCC
2
RST SIM_RST
3
CLK SIM_CLK
C309 C310
1u 27p
Check
soldering all
pin of socket
1 2
4 5
3
6