Sim Detect Trouble - LG C3100 Service Manual

4.12 SIM Detect Trouble

Setting : Insert the SIM into J301. Connect PIF to the phone, and power on.
Check the contact between
Change the SIM and try
The SIM is malfunctioned.
J500
Figure 4-27.
START
Does the SIM No
supports 3V?
Yes
No
Voltage at pin 1 of
J500 =2.85V ?
Yes
No
Check the soldering
condition of J500.
Yes
J500 and SIM card.
Yes
No
again.Does it work
properly?
Yes
Change the SIM.
PIN 1
Change the SIM.Our phone supports 3V SIM only.
Voltage at pin 18 of
U301 =2.85V ?
Yes
Re-solder J500
No
Replace J500.
Does it work properly after
re-downloading SW ?
Yes
SIM will be detected.
VSIM VSIM
R504
R505
20K 0
SIM_CLK
SIM_DATAOP
C502 C503
NA NA
- 63 -
4. TROUBLE SHOOTING
No
Replace U301.
Change
No
the main
board.
VSIM
GND4 GND3
9 8
GND5 GND2
10 7
IO CLK
6 3
VPP RST
5 2
GND1 VCC
4 1
C500
J500
C501 1000p
220n
SIM_RST