02_Troubleshooting.pdf

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7. Flow Chart of Troubleshooting
7-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
is more than 3.4V
No
Change the Battery
Yes
U408 RSTON is 1.8V?
No
Check the PMIC (U408)
Yes
U413 ,U414 LDO output are
2.8V and 1.8V?
No
Check the U413,U414 LDO
Yes
U405 RST_OUT is 2.8V?
No
Check the Reset IC U405
Yes
OSC400 is 32.768Khz?
No
Check the OSC400
Yes
Each LDO PMIC output and
U401 output are OK?
No
Check the PMIC(U408) related LDO
and U401 output
Yes
Check the initial operation
Yes
END
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FlowChartofTroubleshooting
7-2
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FlowChartofTroubleshooting
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FlowChartofTroubleshooting
7-2. Sim Part
Phone can't access SIM Card
Yes
No
CN701 pin 1 = "H"?
Check the SIM POWER
Yes
No
After Power ON,
Check SIM_CLK Signal on
CN400 pin3 in a few second
Check the Clock
Yes
No
Q600 and U607 level shift
work correctly?
Check the Q600 and U607
Yes
After SIM card insert,
CN400 pin 2 = "H(SIM_RST)"?
No
Replace PBA
Yes
Check the SIM Card
END
7-4
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FlowChartofTroubleshooting
+VDD_DIG
SCP
37
R437
SCN
38
D3VDD
39
R420
VDD_BT
SIMD3VBAT
40
SIMVCC
41
SIM_VCC
CN400
42
SIM_IO
1 1
2 2
3
6 6
SIMIOCD
U408
5
5
SI M _CLK
43
4
4
SIMCKCD
3
G
10
G
G
G
7
44
SIM_RST
9
8
_SIMRSCD
SIMEN
45
SIM_EN
GPO3
46
BT_RESET
47
C445
C428
C429
C431
C430
R423
GPO2
+VDD_DIG
48
GPO1
GND
GND 50
51
49
C432
GND
GND 52
NC
NC 54
53
7-5
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