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ONKEYN
typical 3.8V
VBAT
VR400
2.8V
+VDD_RX_TX
+VCC_SYN
+VDD_1V8
+AVDD
+AVDD_HFA
+VDD_IO_HIGH
+VDD_IO_LOW
+VDD_IO_HIGH
2.9V
MIC_BIAS
+VDD_IO_LOW
1.8V
+VDD_RX_TX
2.8V
+VCC_SYN
2.8V
+AVDD
2.6V
+AVDD_HFA
2.6V
RSTON
MIC_BIAS
2.1V
+VDD_1V8
1.8V
IT_PMU
+VDD_GSM_CORE
1.875V
VDD_CAM
2.9V
SIMIO
C407
R401
OSC400
C408
C411
TA410
C412
C414
24
RF2VDD
23
RF12VBAT
22
RF1VDD
21
C415
D1VDD
20
LPD1VBAT
19
LPVDD
18
HCVBAT
17
C429
HCVDD
16
D2VDD
15
IOD2VBAT
14
IOVDD
13
_REC2
C422
C424
C425
C423
6
3
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C405
C406
BU_RST
C426
BAT409
25
26
27
28
29
30
31
32
33
34
35
36
37
SCP
38
SCN
39
D3VDD
40
SIMD3VBAT
41
SIMVCC
42
U400
SIMIOCD
43
SIMCKCD
44
_SIMRSCD
45
SIMEN
46
GPO3
47
GPO2
TP402
48
GPO1
TP401
49
GND
GND 50
51
GND
GND 52
53
NC
NC 54
12
11
10
9
8
7
6
5
4
3
2
1
5
4
2
1
7-7
Flow Chart of Troubleshooting
+VDD_CAM
C413
R404
+VDD_IO_LOW
SIM_VCC
SIM_IO
SIM_CLK
SIM_RST
C418
C419
C420
C417
BT_RST
SIM400
1
6
2
5
3
4
G
G
G
G
10
9
8
7
AUX_ON
SCL
SDA
32KHz_DIGIT
PON_TX
REF_ON
SIMRST
SIMCLK
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