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Flow Chart of Troubleshooting
7-2
+VDD_IO_HIGH
R302
+VDD_IO_HIGH
R304
C304
R303
GND
3
INA
2
1 NC
4
OUTY
VCC 5
U302
26M_DIGIT
26M_CLK
+VDD_IO_HIGH
R302
+VDD_IO_HIGH
R304
C304
R303
GND
3
INA
2
1 NC
4
OUTY
VCC 5
U302
26M_DIGIT
26M_CLK
SIM_VCC
SIM_CLK
SIM_IO
R405
Typical 3.7V
SIM_RST
C423
C409
TA401
R403
R404
C419
C417
C412
C413
C421
C422
R402
VR401
C415
C420
C408
1
_REC2
13
_R
S
T
H
C
11
44
_SIMRSCD
_S
IM
R
S
H
C
7
9
SIMVCC
41
V
B
A
T
31
V
C
H
G
32
V
IN
T
29
V
S
A
V
E
30
_I
R
Q
10
_
O
N
K
E
Y
27
_R
E
C
1
38
SCP
37
S
D
A
3
SIMCKCD
43
S
IM
C
K
H
C
8
SIMD3VBAT 40
SIMEN
45
SIMIOCD
42
S
IM
IO
H
C
P
W
R
E
N
1
6
P
W
R
E
N
2
5
R
E
F
C
28
RF12VBAT
23
22
RF1VDD
RF2VDD
24
S
C
L
2
SCN
14
IOVDD
20
LPD1VBAT
LPVDD
19
M
IC
B
IA
S
12
NC 53
54
NC
O
S
C
I
26
O
S
C
O
25
50
GND
GND 51
52
GND
GPO1
48
GPO2
47
46
GPO3
18
HCVBAT
HCVDD
17
IOD2VBAT
15
C
L
K
32
K
4
C
P
V
B
A
T
36
C
P
V
D
D
35
D1VDD
21
16
D2VDD
D3VDD 39
GND 49
U400
C
H
G
C
U
R
/B
A
T
M
A
X
34
C
H
G
D
R
V
33
+VDD_IO_LOW
C406
R716
TP401
OSC400
C407
G
7
8
G
G
9
10
G
SIM400
1
2
3
4
5
6
BAT400
C416
VR400
+VDD_SLEEP
R401
C424
C410
C425
C414
C418
VBAT
PON_TX
REF_ON
MIC_BIAS
+VDD_IO_LOW
+AVDD_HFA
32KHz_DIGIT
+VDD_IMAGE
BU_RST
RSTON
AUX_ON
ONKEYN
IT_PMU
SIMIO
SIMCLK
SDA
SCL
+VDD_RX_TX
+VCC_SYN
+AVDD
+VDD_IO_HIGH
SIMRST