Sim Detect Trouble - LG C1150 Service Manual

4.12 SIM Detect Trouble

SETTING : Insert SIM into J101, connect PIF to the Phone, and Power on.
Test Points
Figure 4-24
Checking Flow
Pin 1
START
Does the SIM
supports 3V?
Yes
Voltage at Pin 1
of J101 = 2.85V?
Yes
Check the
soldering condition
of J101.
Yes
Check the
contact between
J101 and SIM
card.
Yes
Change the
SIM and try again.
Does it work
properly?
Yes
The SIM is malfunctioned.
Change the SIM.
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4. TROUBLE SHOOTING
Circuit Diagram
GPIO_22
GPIO_23
GPIO_24
SIMCLK
SIMDATAOP
DBB
VSIM
J101
4
GND
5
VPP
6
SIM_DATA I_O
VA165
KCN-ET-0-0048
No
Change the SIM.
Our Phone supports 3V SIM only.
No
Voltage VSIM of U102.
= 2.85V?
Yes
Resolder J101.
No
Resolder J101.
No
Replace J101.
No
Does it work properly after
redownloading SW?
Change the main
SIM will be DETECTED.
VSIM
J14
L10
K13
20K R144
K12
J13
SIM_DATA
VSIM
C172
0.1u
C173
220n
1
VCC
2
RST
3
CLK
C174
C175
27p
1000p
No
Replace J101.
No
board.