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F low Chart of Troubleshooting
ONKEYN
C405
R402
C407
Typical 3.7V
VBAT
V400
C410
C411
R403
+VDD_RX_TX
C412
R404
+VCC_SYN
C414
+VDD_IMAGE
C415
+AVDD
C416
+AVDD_HFA
C422
+VDD_IO_HIGH
C424
+VDD_IO_LOW
C425
R406
2.15V
MIC_BIAS
RSTON
IT_PMU
SIMIO
OSC400
CC7V-T1A
25
26
27
28
29
24
RF2VDD
23
RF12VBAT
22
RF1VDD
21
D1VDD
20
LPD1VBAT
19
LPVDD
18
HCVBAT
17
HCVDD
16
D2VDD
15
IOD2VBAT
14
IOVDD
13
_REC2
12
11
10
9
C423
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C406
C408
BU_RST
POS
C409
C426
NEG
30
31
32
33
34
35
36
C413
37
SCP
38
SCN
R405
39
D3VDD
SIMD3VBAT 40
41
SIMVCC
42
SIMIOCD
43
SIMCKCD
U400
44
_SIMRSCD
45
SIMEN
46
GPO3
47
GPO2
V401
48
GPO1
GND 49
50
GND
GND 51
52
GND
NC 53
54
NC
8
7
6
5
4
3
2
1
TP400
+VCC_SYN
C312
26M_CLK
7- 2
2.9V
+VDD_SLEEP
1.8V
+VDD_IO_LOW
1.8V
SIM_VCC
SIM400
SIM_IO
SIM_CLK
1
6
2
5
SIM_RST
3
4
G
G
G
G
10
9
8
7
C417
C418
C419
C420
C421
+VCC_SYN
U302
R313
1
5
NC
VCC
2
INA
R314
3
4
R315
GND
OUTY
C315
AUX_ON
SCL
SDA
32KHz_DIGIT
PON_TX
REF_ON
SIMRST
SIMCLK
26M_DIGIT
D_REF_CLK
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