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Flow Chart of Troubleshooting
Power On
ONKEYN
Typical 3.7V
VBAT
V400
R405
2.8V
0
+VDD_RX_TX
R406
2.8V
+VCC_SYN
1.9V
+VDD_IMAGE
2.6V
+AVDD
2.6V
+AVDD_HFA
2.9V
+VDD_IO_HIGH
1.8V
+VDD_IO_LOW
R408
2.15V
MIC_BIAS
RSTON
IT_PMU
SIMIO
C407
C409
32KHz clock
C411
C412
C413
C415
C416
C417
C423
C424
C425
C424(VDD_IO_HIGH)
C425(VDD_IO_LOW)
C426
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R404
OSC400
R402
25
26
27
28
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
9-2
C406
C408
C408
VINT
POS
C410
BAT400
NEG
29
30
31
32
33
34
35
36
37
SCP
38
SCN
39
D3VDD
40
SIMD3VBAT
41
SIMVCC
42
SIMIOCD
43
SIMCKCD
U400
44
_SIMRSCD
45
SIMEN
46
GPO3
47
GPO2
48
GPO1
GND 49
50
GND
GND 51
52
GND
NC 53
54
NC
9
8
7
6
5
4
3
2
1
BU_RST
RESET_BT
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