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Flow Chart of Troubleshooting
7-2
SI
M_
VC
C
2.
6V
2.
9V
V
D
D
_
IO
_
H
IG
H
VCC_
RX_
T
X
VDD_
IM
AGE
AVDD
1.
9V
not
use
DCDC-
1.
875V
AVDD_
HFA
2.
7V
M
IC_BI
AS
SI
M_
C
L
K
VDD_
IO
_
L
O
W
VCC_SYN
VDD_
GSM_
CORE
VD
D
_4V
2.
7V
SI
M_
IO
VDD_SLEEP
2.
9V
3.
3V LD
O
VDD_
VI
B
2.
1V
SI
M_
R
S
T
2.
6V
VDD_VI
B_2.
9
2.
9V
DC/DC Down Conveter(1.8Volt)
BT_N
O
T
_U
SE
LDO
not
use
2.
9V
C
404
R
405
C
419
VI
N
3
VOUT
4
R
401
U
401
GND
2
GND
6
NC
5
1
STBY
_R
EC
2
13
_R
ST
HC
11
_
S
IM
RSCD
44
_S
IM
RS
HC
7
SI
M
V
CC
41
VB
AT
31
VC
HG
32
VIN
T
29
VS
AV
E
30
_IR
Q
10
_O
NK
EY
27
_R
EC
1
1
SCP
37
SD
A
3
SI
M
C
KCD
43
SIM
CK
HC
8
SI
M
D
3VBAT
40
SI
M
E
N
45
SI
M
IOCD
42
SIM
IO
HC
9
PW
RE
N1
6
PW
RE
N2
5
RE
FC
28
RF12VBAT
23
22
RF1
V
DD
RF2
V
DD
24
SC
L
2
SCN
38
14
IOV
D
D
20
LPD1VBAT
LPVDD
19
MIC
BIA
S
12
NC
53
54
NC
OS
CI
26
OS
CO
25
GND
51
52
GND
GPO1
48
GPO2
47
GPO3
46
18
HCVBAT
HCVDD
17
IO
D2VBAT
15
CL
K3
2K
4
CP
VB
AT
36
CP
VD
D
35
D1
VDD
21
16
D2
VDD
D3
VDD
39
GND
49
50
GND
U400
CH
GC
UR
/B
AT
MA
X
34
CH
GD
RV
33
R
403
C400
C
411
R406
+VD
D
_
IO
_LO
W
_1.
9V
C405
C
414
C
413
O
S
C
400
R
400
C
402
U720
C
409
V400
R408
C
417
R
404
C
406
C
416
NE
G
PO
S
C
412
R714
BAT400
L400
G
8
9
G
G
10
TH
40
0
1
2
3
4
5
6
7
G
C
401
SI
M
400
C723
C
418
C
422
C
421
T400
R
402
C
420
C
415
C408
U
402
EN
3
FB
4
2
GND
SW
5
1
VI
N
C
407
L401
C
403
U
716
C
410
C
423
+VD
D
_
U
SB_3.
3V
+VDD_
GSM_
CORE_
1
.9
V
BACKLI
G
HT
USB_I
N
+VBUS
+VC
C
_
SYN
_2.
8V
+VDD_SLEEP_2.
9V
+AVDD_
HFA_
2
.6
V
+AVD
D
_2.
6V
+VDD_
IM
AGE_
2
.9
V
SI
M
C
LK
SI
M
IO
VBAT
BU_RST
IT
_
P
M
U
ONKEYN
AUX_ON
RSTON
SI
M
R
ST
+VD
D
_
IO
_LO
W
_1.
9V
32KH
z
_D
IG
IT
REF_
ON
PON_TX
SCL
SDA
VBAT
+VDD_
RX_
T
X_
2
.8
V
+VD
D
_
IO
_H
IG
H
_2.
9V
+VD
D
_
IO
_LO
W
_1.
9V
M
IC_BI
AS