Sim Card Trouble - LG FM300 Service Manual

4.4 SIM card Trouble

4.4.1 Main Board 4 4 1 Main Board
TP4
SIM_CLK
SIM_RST/
SIM_PWR
CN300
TP2
TP2
53
1 2
LT_USIM_DET/
3 4
TP320
5 6
TP321
7 8
TP322
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
TP307
25 26
TP315
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
TP317
49 50
TP318
51 52
TP306
54
ENZY0030701
24-6407-052-001-888
LGE Internal Use Only
S300
G5 G3 G1 COMMON
R351 DNI
TP4
G6 G4 G2
C339 C340 C341 C342
0.1u 100p 33p 33p
TP305
SIM_PWR
SIM_DATA
SIM_CLK
SIM_RST/
VDD_2.6_LT
TP304
TP308
TP314
4. TROUBLE SHOOTING
ENSY0023001
SCGC1B0100
TP3
TP302
8
R350 0
7
6
5
TP303
4
3
2
1
SW
C350
DNI
VDD_3.3
R303
4.7K
IC301
1
VL
2
R314 DNI
I_OVL1
3
I_OVL2
4
TP310
I_OVL3
C312 C313
DNI DNI
5
TP309 I_OVL4
C315
100n
R363
4.7K
IC303
1
VDD_2.6_LT
2
3
4
5
LT_USIM_DET/
C352
C353 C354 C355
100n
DNI DNI DNI
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4. TROUBLE SHOOTING
R348
SIM_PWR
4.7K
TP3
SIM_DATA
C349
DNI
TP1
R307 0
NP_USIM_DET/
R308 0
LTE_USIM_DET/
TP1
11
VCC
10
I_OVCC1
9
I_OVCC2
8
TP312
I_OVCC3
7
I_OVCC4 TP313
C314
100n
11
VL VCC
10
I_OVL1 I_OVCC1
9
I_OVL2 I_OVCC2
8
I_OVL3 I_OVCC3
7
I_OVL4 I_OVCC4
C351
100n
Only for training and service purposes
VDD_3.3
W_DISABLE/
PERST/
VDD_3.3
MODE1
MODE2
MODE3
LTE_USIM_DET/