Samsung Z220 Service Manual Trouble Shooting
7. Flow Chart of Troubleshooting
7-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
is more than 3.4V
Yes
U408 RSTON is 1.8V?
Yes
U413 ,U414 LDO output are
2.8V and 1.8V?
Yes
U405 RST_OUT is 2.8V?
Yes
OSC400 is 32.768Khz?
No
Change the Battery
No
Check the PMIC (U408)
No
Check the U413,U414 LDO
No
Check the Reset IC U405
No
Check the OSC400
Yes
Each LDO PMIC output and
U401 output are OK?
Yes
Check the initial operation
Yes
END
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No
7-1
Check the PMIC(U408) related LDO
and U401 output
FlowChartofTroubleshooting
7-2
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FlowChartofTroubleshooting
7-3
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FlowChartofTroubleshooting
7-2. Sim Part
Phone can't access SIM Card
CN701 pin 1 = "H"?
Yes
No
Check the SIM POWER
Yes
After Power ON,
Check SIM_CLK Signal on
CN400 pin3 in a few second
Yes
Q600 and U607 level shift
work correctly?
Yes
After SIM card insert,
CN400 pin 2 = "H(SIM_RST)"?
Yes
Check the SIM Card
No
No
No
Check the Clock
Check the Q600 and U607
Replace PBA
END
7-4
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+VDD_DIG
FlowChartofTroubleshooting
U408
SCP
SCN
D3VDD
SIMD3VBAT
SIMVCC
SIMIOCD
SIMCKCD
_SIMRSCD
SIMEN
GPO3
GPO2
GPO1
GND
GND
GND
GND
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
NC
54
NC
R437
C432
R420
BT_RESET
VDD_BT
SIM_VCC
SIM_IO
SIM_CLK
SIM_RST
C445 R423
C428
C431
C429 C430
SIM_EN
1
2
3
+VDD_DIG
CN400
6
6
1
5
2
5
4
4
3
G9GG
G
10
7
8
7-5
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FlowChartofTroubleshooting
7-3. Speaker Part
Speaker does not work
Yes
R701 = 3V
Yes
No
Check the U408
Check the Clock signal
at Pin 35 of U701
(26MHz)
Yes
U702 works correctly?
Yes
Is Speaker working?
Yes
END
No
Check the U500
No
Check the U702 switching operation
No
Change the Speaker
7-6
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FlowChartofTroubleshooting
7-7
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FlowChartofTroubleshooting
7-4. Microphone Part
Microphone does not work
Check the connection
from MIC
Yes
No
Resolder MIC
Yes
No
Check the circuit
from U500 to MIC
Yes
Check the MIC
Yes
END
Resolder the related component
No
Replace the MIC
7-8
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